CA1264444A - Multiple filter unit, particularly for ventilation and air conditioning systems for motor vehicles and closed environments, and provided with efficiency checking means - Google Patents
Multiple filter unit, particularly for ventilation and air conditioning systems for motor vehicles and closed environments, and provided with efficiency checking meansInfo
- Publication number
- CA1264444A CA1264444A CA000481439A CA481439A CA1264444A CA 1264444 A CA1264444 A CA 1264444A CA 000481439 A CA000481439 A CA 000481439A CA 481439 A CA481439 A CA 481439A CA 1264444 A CA1264444 A CA 1264444A
- Authority
- CA
- Canada
- Prior art keywords
- filter unit
- filter
- casing
- diaphragm
- constituted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/06—Filtering
- B60H3/0658—Filter elements specially adapted for their arrangement in vehicles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/06—Filtering
- B60H2003/0683—Filtering the quality of the filter or the air being checked
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/06—Filtering
- B60H3/0608—Filter arrangements in the air stream
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
ABSTRACT
A multiple filter unit in the form of a complete interchangeable unit for insertion into a motor vehicle interior ventilation duct, or into the mouth of air conditioners or into suction-producing apparatus for closed environments, comprising a rigid casing provided with retention and sealing means, a series of filter elements and/or chemical products and/or electrostatic filtering devices disposed in a predetermined order for filtering solid particulate matter, mists and air pollutant gases, and means for checking the degree of efficiency.
A multiple filter unit in the form of a complete interchangeable unit for insertion into a motor vehicle interior ventilation duct, or into the mouth of air conditioners or into suction-producing apparatus for closed environments, comprising a rigid casing provided with retention and sealing means, a series of filter elements and/or chemical products and/or electrostatic filtering devices disposed in a predetermined order for filtering solid particulate matter, mists and air pollutant gases, and means for checking the degree of efficiency.
Description
TlTLE OF THE INVENTION
"Multiple filter unit, partlcularly for ventilation and air condi~i-oning systems for moeor vehicles and closed environments~ and provided with efflciency checking means"
~5 BACKGROUND OF THE INYENTION
The present inventlon relates to a ~ultiple filter unlt for purifying alr~ in partlcular for motor vehicles or closed environments, and insertable into ventilation and air conditio~ing systems.
Technical development has inevltably led to chemical, physical or 10 blologlcal alterations of the environment. Atmospherlc pollutlon i8 itself a chemical physical alteration of the alr. The alteration is natural when it relates to bacteria, gas of vulcanic origin, marine aerosols and the like. In con~rast, it i8 artlficial if due to combusiton sys~ems, indus~rial plants or motorisation.
15 Any type of combustion leads to flnal products whlch have~to be .
dispersed and settled. These are~constieuted by oxygenated carbon compounds, unburnt hydrocssbons,~nitroeen oxlde~ oxygenated sulphur compounds, water vapour and unburnt or incombustible solld particles~
~Wlth regard to industrial~plants, the~act thst they;are loca~ed in~
20 relatively small determined~areas leads to a vèry hlgh concentr~ation oE lndustrial emissions.~ The main indugtrlal pollutsnts ars oxygensted carbon compounds, nltrogen~oxldes, sulphur~trloxlds, hydrocsrbons ~and~solid part$cles. ~otor~vehicle engines themselves emit large quantitie~ of pollutants~,~especiall~y in~he~ga~e~u state, including ~; ;25~carbon mono~ide, unburnt h~drocsrbons~and~nItrogen oxide~.
Thsre are various pollutant~remo~al~methods,;~hich csn be grouped in~o ~ive categories:
æ~
: ' ;
.. :.~; .
...
a) conversion of the gaseous pollutant into another product and recovery of the new substance;
b) decomposition of the gaseous pollutants and conversion into innocuous products;
5 c) conver~ion into easily eliminated products;
d) elimlnation of gaseous pollutants by ~ooling and condensa~ion;
e) elimin tion by absorption in liquid or ad~orptlon on a solid.
Studies car~led out in Italian urban areas have demonstrated the ~nfluence which atmospheric conditions and seasonal cycles hs~e 10 pollution. In this respect, partlcularly in wlnter, when wind i5 ab~ent a stable system forms which tends to trap emisslons~ which are es~entlally of domes~ic (heating) and vehicle origin. As the day progre~ses, pollutioo hlgh points are observed depending on the particular moment. In con~rast, during summer all values dacrease 15 and are more uniform. Again~ pollution is not uniform over the enti~re urban area, but depends on the eloseness or otherwise of lndustrie3, the roads of greate~t clrculation, and whether tree-containing areas are present~ It~is;however general9 aod extends also to roads outside the town, where~it i8 naturally proportional 20 tc the intensity of tlle trafflc using themO
In order to combat pollutlon, industries already u~e purlfiers.
Special foamed material i~ able to~retain particulate matter. Filters with activated carbon are~used on cooker hoods withoot a discharge duct. The army, the fire service and police use protective masks 25 for high gas, fume and dust concentratlons. Catalysts for appli~ation to the e~haust pipes of internal combustion englnes using leadless petrol have been designed ln order to prevent thelr very rapld deterioration.
:, , .
4~
-- 3 -- .
In large closed ~nvironments such as factorie~, cinema8 ~ restaurants and the like, central air treatment plants are already installed, but are generally limited to solid particulate ma1:ter, so that the air which is introduced is not clean but contalns poll~tant substances.
5 The air normally breathed in automobiles, office~ and small closed environmen~s is also polluted by the air originating from the outside.
SU~MARY OF T~E INVENTION
The present lnvention obviates the aforesald drawbacks by treating lO the air origi~atlng from the out~de and puriEy~ng it before lt is lntroduced into the envlronment by a fsn or by dynamic suctlon.
Accordlng to a preEerred embodiment of the invention, it ls possible to lnsert lnto the air inlet duct for the internal ventlla~ion oE
a m~tor ~ehiele a multiple fllter unit in the:~orm of a complete : l5 interchangeable and entirely replaceable UDit, co~prising a substan-lally rigid casing, for example of~ cardboard,~plastics~material or : :~ the like,~having R cros3-sectlonal shape corresponding to that o~
~he duct lnto whlcb it is lnsert&d, but of slightly smaller : dlmenslons.
20 On thP outside of said casing there~ i8 provided a covering of Elexible aterial,: for examp~le foamed ma;~erlal, whlch tapers towards the rear end in~order~to acilitate~1nsertlon~of~the~fl1ter unlt~into the duct, and of dimension~ such as ~o form~a forsed and retention Eit ln the duct.
~: 2S Ingide the caslng there is provided~, according:to the~:present lnven-tion~ a series of ele~nents of filter material and/or chemlcal products and possibly electrostatic devices or the like, disposed ln a .~
:, :
. .
predetermined order so as to obtaln complete flltration and pur$fl-catlon of the indrawn air both with regsrd to dust and mist eliml-na~ion, and with regard to the elimination of pollu~ant gas.
In the con~idered embodlmen$, in the air flow direction a first 5 element constituted by an inertial separating filter for retainlng coarse solid partlculate matter i3 followed by a perlmetral spacer ~o ensble the air stream to attain uniform dlstribution, a ~econd element constltuted by an inertial separaclng filter of finer type for solid particulate matter of smaller diameter, a third element 10 constituted by an absolute ~psrating filter or a sieve for retaining ~he smallest partlcles pre~ent in the st~eam, a four~h fiIter element constituted by one or more of ~he following types in combinatlon ~ith each other: a bed of granùlar ad~orbent ~olids and/or ~elec~ive molecular sieves for the removal of most of the main pollu~ant gases lS ~uch as S03, C02, N0, and a fiEth fileer element constltuted by a catalyst for mainly removing C0.
A filter element can also be ~mpregnated wlth deodorant ~ubstance3 o~ mlxed with deodorant granular particles for the elimlnation of bad odours from the automobile passenger compartment.
: 20 According to the invention, the v$rious fiIter elements forming the unit are of such thlckness and:tor ma~erial and/or operating conditions that ~lieir degradation and llfa, in relation;to the filtering capacity o~ each individual element,;are substantlally the~same for all, : ~ :
25 Means are also prov$ded for ~acil~ita~lng grlpping of ~he filter unit and its removal for replacement purposes, and means or checking the.
state of efficlency of aach indlvidual f~ r element or of all the .,. ~. .
~26~44 elements overall. Said checking mean~ can be constituted for example by warning s~rips or tapes which are either separate Prom each other or are joined together at that end whlch projects from the unit, and are dlsposed to ~he rear of each filter element, and preferably in 5 a transverse direction, so as to be traversed by a significant air flow, and further having such dimensions and characterlstic~ as ~o be put under the same conditlons as the respective filter element and to indicate lts efPective state of efficiency.
The means for checking the state of efficiency of the f~lter unit 10 can also comprlse, possibly as an alternative, a device for measuring the pressure difference between the upstream and downstream side of the filter unit, and constituted for example by a tube which axially traversea all the elements Df the filter unlt and i9 associa~ed, at one of its two ends, with a diaphragm ~ensitive to the pressure 15 difference created betweerl the upstream and downstream end o~ the fllter unit as a fun~tion of its overall d~gree of clogging. The deorma~ion of the diaphragm caused ~by the clogging operates known means for checking and indicatlng the state of efficlency, snd simultaneously operates,~for predetermined limiting values, means 20 for stopping the operation of the motor vehicle fan in order to pre~ent it becoming dama&ed in the ab~ence of the air Plow.
IE ~aid diaphragm~associated wlth the~ax~ial~tube ls disposed to thP
front of ~he fllter unlt so as to be able to be inspected from the oo~side by direct vlewing oP ~the front end of the unit, means can 25 be provided for blocking the limlting deformation attained by the diaphragm, ~r alternatively the diaphragm can be sized ~n juch a manner as to cause it to rupture on attaining a predeterm~ned ',: `'' : ' . :
. ' ,,, , ,. ~ `' "" ' 4~
limiting deormation indicative of overall clogging of the filter unit.
Accoridng to a further preferred embodiment, the filter unit when for closed ~nvironments or air conditioning ~ystems comprlse~
5 preferably a casing provided with a flange containing holes for screws for its fixing to a f$xed s~ructure, for example for its fixing to the inlet port of an air conditioner or to 8 hole in a glass pane, wall or the like, and possibly a seal ga~ket of known type for its application to the glass pane or wall.
10 Said filter unit can be formed from the same filter elements a~ ~hose heretofore descrlbed, or alternatively as there are no longer any overall dimensional or feed requlrements, one of the inertial aeparating filter elements can be replaced or flanked by a fixed electrostatic precipitator connected to the electricity mains, and 15 said filter unit can be ass~ciated with a Pan for creating the air change clrculation, should said fan not already exist.
According to the invention, there are al50 provided means for checking the state o~ efficiency of the~individual filter~elements or of the : entlre overall unit, soch as warniDg tapes or strips, or means to 20 allow direct ~iewing through the~transparency of the outer casing or through an axial ~lot formed ln the ca~lng.
D~SCRIPTION OF THE D~AWINGS
; These and further characteristics will be apparent from the detailed descriptivn given hereinafter by way of non-limiti~g example, with e5 reference to the accompanying figure~ in which:
~lgure 1 is a diagram~atic represen~ation of the filter unit inserted into a horizontal-axiæ air lnle~ por:t of an automoblle;
,.
. . .
' ;
6~
Figure 2 ls a diagrammatic representation of th~ filter unit inserted into a vertical-axis air lnlet port of an autom~bile;
~igure 3 is an axial sectlon through the filter u~it; and Figure 4 shows a fllter uni-t for closed environmerlts.
5 DETAILED D~SCRIPTION
F~gures 1 and 2 are a diagrammatlc representation of the front ~one of a motor vehicle in which the main air inlet for the internal ventilation is generally disposed inside the englne compartment 1, below the hood in a position corr~sponding with substantially hori-lO zontal air lnlet apertures 3 di~posed for example at the base of thewindscreen 4.
In the arrangement shown in Figura 1, below $he air lnlet apertures 3 there is situat~d 8 box 5 lnto which the air is conveyed from the outside. Any water is discharged through the outlet 5a, : 15 In the arrangament shown in Figure 2, below the ~ir inlet apertures 3, there is provided a-cap 6 of vertical~axis for conveying away Erom the air lnlet mouth any water whl;ch has eneered fro~ the aper-:tures.
In the b~x 5 or below ~he cap 6 there is provided a duct 7 in which 20 there is disposed an electric fan 8 which draws the external air from the mouth end of the duct 7 in order to feed lt throogh ducting 9 to the automobile ventilation system.
The multiple filter unit of tbe present inven~ion, lndicated overall by 10 and shown in detail in Figure 3, is located in the initial part 25 of the duct 7.
Said ilter unit lO is inserted as a complete unit and is interchange-able and completely replaceabie without requirlng any particular :.
~6~4 mechanical intervention.
With reference to Figure 3, the filter unit 10 is constituked by a substantially rigid oasing 11, for example of cardboard, plastics material or the like, having a cross-se~tion corresponding to that of the duct 7 into which lt is inser~ed, but with slightly smaller dimensions.
On the outside of said casing 11 there is provided a layer of flexible material 12, for example foamed plastlcs material, which slightly tapers towards the rear end o~ the ca~ing 11 and is o~
such dimensions a~ to produce a forced fit inside ~he duct 7 when the unit 10 is inserted therein starting from the taperçd end to facilitate its en~ry, and to create sufXicient elastic pressure on ~he ~alls of the duct 7 to retain the filter unit 10 in position.
Inside the casing 11 there is provided a series of elements of fllter material andtor chemical products, and possihly electrostatic devices or the like, dlsposed in a predeter~lned order in order to obtain complete filtration and purificatlon of the indrawn air.
The ~ilter unit 10 comprlses, ~isposed ln the air flow direction in accordance wlth the arrow ~, a first ele~ent 13 constltuted by an inartial separating filter, for example of the labyrinth type, provided ~or retaining coarse solid particulate matter of diameter greater than one~ mi~ron, while at the same time able to offer the least possible resistance to the passage of the air, and having a high dust storage capacity. Preferably, it has been found that a filter element, for example of the polyurethane foam type, with 25 passages per cm2 and an axial thickness of about 6 mm B
`
..
"
~26~
ls sufficient for the purpsse.
A perimetral spacer 14 of known type enables the air which has passed througb the first filter elemene 13 to regain a certain degree of unlformlty for improved efficiency of the subsequent filtering S layers.
A second elemPnt ]5 is constituted by a further inertlal separating filter of smaller passages, downstream of which the pa~ticulate matter suspended ln the fluid stream is of diameter l~ss than one micron. Preferably, it has been found that a filter ele~ent, Eor 10 example of the polyurethane foam typ~, with 40 passages per cm2 and an axial thickness of about 6 mm is sufflcient for the purpose.
A third filter element 16 is constituted by an absolu$e separating filter, for example of sintered eextile fibre~ or woven glass fibres~
with high separ~tion power, for retaln~ng the smaller residual 15 particles preseot in the stream.
A~fourth filter element 17 is constituted by adsorben~ solids for removlng~certaiD pollutant gases3 fa~ty constit~ents of the alr and bad odours. Preferably, it has been fou~d that selective granular beds, for e~ample of activated carbon, with an axial thickness of 20 20 mm are suff~cient for the purpose.
As an alternative to, or in comb mation with the adsorbent solids, the fourth element can for example be a &ranular mixture of ASCARlT ~ and lithium hydroxide on an asbestos base for adsorbing a large proportion of the acid pollutant gases such as S02, S03, C0 , 25 N0 and, partially, C0. Preferably, it has been found that a layer Oe 20 mm axial thickness is sueficlent for the purpose.
Furthermore, as an alternative eo or in combination with the preceding, , ...
~2~i~at4A~
~ 0 27637-1 the fourtb Eilter element 17 can be constltuted hy a molecular sieve selective for particular chemical compounds.
A fifth filter element 18 is constituted by a catalyst, the purpose of which is to fix the residual pollutant substance, particularly CO, in the form of a compound by chemical reaction.
Each of the aforesaid filters can be formed from a number of layers selective for di~ferent substances.
Furthermore according to the invention, one of the fllter elements can be impregnated with a deodorant substance or mixed with deodorant granular particlesl in order to eliminate bad odours inside the automobile.
On the fron~ end of ~he casing 11 there ls providedr rigid therewith, a transverse bar 19 provided with a gripping ring or the like l9a, for extracting the filter unit 10 from the duct 7 when the unit 10 is to be replaced.
The various filter elements forming the filter unit 10 are of such thickness and~or material and/or operating conditions that ~oth their degradation and their life in re~ation to the filteriny capacity o~ each element are substan~ially the sa~e for all.
The life and/or the state of efficiency of each individual element or of all the elements which overall form the filter unit 10 can be checked by inserting behind each iilter element 13, 15, 16, 17 and 18 a warnLng strip or tape which is of such material and dimensions as to behave as the filter element itsel~ or to be influenced by it in relation to the residual degree of effic.iency o~ the element. For example, on the rear o~ the ~irst fLlter element 13 there is disposed a warnin~ strlp or tape 13a composed of the same material as the element 13 itself, but suitably , ",' 4a~
decoloured or coloured so that as the air passage pores of ~he inertial separating filter 13 become clogged, the warning tape or strip 13a changes colour in relation to the retained solid particles until a limitin~ check colour iB attained, this being prede~erminecl by the manufacturer and suitably indicated in the instruc~ions or in a suitable space on the casing 11.
rhe same procedure is followed for checking the state of efficiency of the other layers 15, 16, 17, 18 by respective warning tapes or strips 15a, 16a, 17a, 18a placed on their rear.
`In order to put said warning strips or tapes 13a to 18a under ~he same condikions as the respective filter element 13 to 18 and thus able to indicate the effective state of efficiency of the elements themselves, the warning tapes or strips can preferably be disposed transversely through a length such as to be traversed by a significant air flow.
The user can check the state of efficiency of the ent.tre filter by extrac~ing said warning tapas or strips one at a ti~e at different times until one of them shows the limitlng coloration conditions indicated by the manufacturer, this signifying, on the basis of the aforegoing, tha~ all the other layers are also substantially in the same state of efficiency.
It ls also possible to simultaneously extract all the warning tapes or strips by connecting them together at the ends which project to the outside by means of a common grip 20, to thus be able to simultaneously check ~he state of effi.ciency ,~
of each of the fi.lter elements. In thi6 case~ 1t is nectssary to insert more than one set of warning tapes or strips to be extracted for checking purp4ses at different times during the u~e of the filter unlt lO.
5 As a modification, the state of efficiency of ~he filter uni~ lO can be checked by disposing a tube 21, for example of pla~tics material, which passes axially through all the elements of the filter unit lO
and ls associaced at one of its two ends with a diaphragm Z2 sensitive to increasP in the pressure dlfference created between the upstream lO and downstream ends of the filter unit lO by virtue of lts progressive clogglng, said diaphragm deforming as a function of this until a limiting deformation is reached on to~al clogging. The diaphragm 22 is associated with known electrical, visual or acoustic means for checking and di~playing the deformation, and thus for indicating 15 when ~he limi~ing deformation is~attained, to lndicate the ~tate of efflciency of the filter unit lO.~ Simul*aneously with its attaining of ll~1ting deformation, and thus of total clogging of the filter :unit lO, ~hlch results in reduced alr pas~age,:~aid diaphragm 22 operate~ means for stopping the operation of the vehicle electric 20 fan 8, in order to prevent its operation under said conditlons, thus preventing it becoming damaged.
If the diaphragm 22 is disposed at the front end of the axial tube 21, projecting from the filter unit lO, ~t can be inspected directly from the outside and it is possible t~ check when the filter unit lO
25 has become completely spent, either by the fact of the diaphragm 22 rupturing, it being si~ed for a determined limitlng pressure : difference value, or by the fact of the diaphragm deformation having , .
: .. , , ' ::
: .- .. ,;;. . .
:::
~.26~49L
attained a limitiIlg position and having been blocked thereat, for example by elastic retention or the like.
This therefore prevents the filter uni~ 10 be~ng able9 due to forgetfulness or neglect on the part of the user, to remain in the 5 intake duct 7 after lt has become completely spent and no longer exerts lts filtering and purifying acti~n, and preventing or reducing passage of the ventilation air int~ the automobile, and creating both discomfort for its occupants and the dan8er of da~age to the automobile f an should this be put into operatlon.
10 With reference to Figure 4, according to a further embodiment and application of th~ invention, the filt~r unit 30 is constituted by a substantially rigid outer casing or body 31, for example of metal, plastics materlal or the like, having a cross-section of suitable shape for fitting into seats provided either on a wall vr on a glass 15 pane. The casing 31 is preferably provided with a flange 31a with holes for the passage of screws or the like for its connection to the fIxed structure, and seal gaskets of known type.
A Iow-speed fan 32 for creating the suctlon necessary for the opera-tion of the entire filter unit 30 is fixed in known manner inside 2a said outer rigid casing 31 and is connected to the electriclty mains.
The filteir unlt 30 for closed environment~s~can be formed with the same filter elements already de~crlbed for the motor vehicle filter unit IO or, as an~alternatlve to the second f$1ter element 15 constituted pref~rably by an inertial separating ilter, a current-25 fed electrostatic precipitator can be provided if there are nodimension problems or problems regarding the co}lec~ion of non-conductive dusts.
. . -.
In a further emhodiment of the filter unit 30 and with reference to Figure 4, the filter unit 30 con~ained in the outer casing or body 31 is formed from two parts 30' and 30" which are separated from each other by said fan 32.
The first filter unit 30' comprises an internal rigid casing 33 of cardboard, plastics material or the liks, surrounded by a layer of flexible material 34, for example plastics foam, of such dimensions as to create sufficient elastic pressure and form a forced fit against the walls of the outer casing 31.
Said inner rigid casin~ 33 comprises a first element 35 constituted by a coarse inertial separating filter, a perimetral spacer 36 and a second fil~er element 37 constituted by a current-fed electrostatic precipitator and/or a second finer inertial separating filter. Said first filter unit 30' can be removed ~o allow its reyeneration and thus its re-utilisation.
Downstream of the fan 32 there is a second filter unit 30"
comprising a second inner rigld casing 38 of cardboard, plastics material or the like, covered externally by a layer of flex1ble material 39, for example plastics foamr of such dimenslons a~ to create sufficient elastic pressure and constitute a forced fit against the lnner walls of the oute~ casing 31.
Said inner ri~id casing 38 comprises filter elements 40, 41, 42 which can be of the same type as the filter ele~ents 16, 17, 18 of the motor veh1cle filter unit 10.
Means are also provided for checkin~ the state of ef~iclency of ; the filter unit 30 either of the already described warnlng ~ape or strip type, or ~or example hy directly ",~. " ~
,, ~,' '' ~,, ~644~4 vlewlng, through apertures provided in the outer casing 31 and in the innPr casings 33 and 38, or through transparent casings, the colour assumed by ~he various elements of the filter unit 30, or other indications suitably provlded for by the manufacturer, together 5 with their relative instnlctions.
Obviously, if the filter unit of the present invention is to be provided for fittin~ into the inlet mouth of an air conditioning system or ai~ conditioners, it can be form~d from the same filter elements as already described, taking into constderation the fact 10 that the suction created by the air conditioner ltself is used for i~s operation, so that no fan 32 ~ill be required.
Numerous modifications can be made to the filter unit according to the invention, in relation to the number and the succession-arrangement of the filter elements, and in relation to their type, chemical 15 composition and formatlon, and ~ur~her in relation to their shape and dlmensions, but without~l~ea~ing the scope of the present invention.
:
' . .
: ~ , , .` ~ , .
::: ' .
"Multiple filter unit, partlcularly for ventilation and air condi~i-oning systems for moeor vehicles and closed environments~ and provided with efflciency checking means"
~5 BACKGROUND OF THE INYENTION
The present inventlon relates to a ~ultiple filter unlt for purifying alr~ in partlcular for motor vehicles or closed environments, and insertable into ventilation and air conditio~ing systems.
Technical development has inevltably led to chemical, physical or 10 blologlcal alterations of the environment. Atmospherlc pollutlon i8 itself a chemical physical alteration of the alr. The alteration is natural when it relates to bacteria, gas of vulcanic origin, marine aerosols and the like. In con~rast, it i8 artlficial if due to combusiton sys~ems, indus~rial plants or motorisation.
15 Any type of combustion leads to flnal products whlch have~to be .
dispersed and settled. These are~constieuted by oxygenated carbon compounds, unburnt hydrocssbons,~nitroeen oxlde~ oxygenated sulphur compounds, water vapour and unburnt or incombustible solld particles~
~Wlth regard to industrial~plants, the~act thst they;are loca~ed in~
20 relatively small determined~areas leads to a vèry hlgh concentr~ation oE lndustrial emissions.~ The main indugtrlal pollutsnts ars oxygensted carbon compounds, nltrogen~oxldes, sulphur~trloxlds, hydrocsrbons ~and~solid part$cles. ~otor~vehicle engines themselves emit large quantitie~ of pollutants~,~especiall~y in~he~ga~e~u state, including ~; ;25~carbon mono~ide, unburnt h~drocsrbons~and~nItrogen oxide~.
Thsre are various pollutant~remo~al~methods,;~hich csn be grouped in~o ~ive categories:
æ~
: ' ;
.. :.~; .
...
a) conversion of the gaseous pollutant into another product and recovery of the new substance;
b) decomposition of the gaseous pollutants and conversion into innocuous products;
5 c) conver~ion into easily eliminated products;
d) elimlnation of gaseous pollutants by ~ooling and condensa~ion;
e) elimin tion by absorption in liquid or ad~orptlon on a solid.
Studies car~led out in Italian urban areas have demonstrated the ~nfluence which atmospheric conditions and seasonal cycles hs~e 10 pollution. In this respect, partlcularly in wlnter, when wind i5 ab~ent a stable system forms which tends to trap emisslons~ which are es~entlally of domes~ic (heating) and vehicle origin. As the day progre~ses, pollutioo hlgh points are observed depending on the particular moment. In con~rast, during summer all values dacrease 15 and are more uniform. Again~ pollution is not uniform over the enti~re urban area, but depends on the eloseness or otherwise of lndustrie3, the roads of greate~t clrculation, and whether tree-containing areas are present~ It~is;however general9 aod extends also to roads outside the town, where~it i8 naturally proportional 20 tc the intensity of tlle trafflc using themO
In order to combat pollutlon, industries already u~e purlfiers.
Special foamed material i~ able to~retain particulate matter. Filters with activated carbon are~used on cooker hoods withoot a discharge duct. The army, the fire service and police use protective masks 25 for high gas, fume and dust concentratlons. Catalysts for appli~ation to the e~haust pipes of internal combustion englnes using leadless petrol have been designed ln order to prevent thelr very rapld deterioration.
:, , .
4~
-- 3 -- .
In large closed ~nvironments such as factorie~, cinema8 ~ restaurants and the like, central air treatment plants are already installed, but are generally limited to solid particulate ma1:ter, so that the air which is introduced is not clean but contalns poll~tant substances.
5 The air normally breathed in automobiles, office~ and small closed environmen~s is also polluted by the air originating from the outside.
SU~MARY OF T~E INVENTION
The present lnvention obviates the aforesald drawbacks by treating lO the air origi~atlng from the out~de and puriEy~ng it before lt is lntroduced into the envlronment by a fsn or by dynamic suctlon.
Accordlng to a preEerred embodiment of the invention, it ls possible to lnsert lnto the air inlet duct for the internal ventlla~ion oE
a m~tor ~ehiele a multiple fllter unit in the:~orm of a complete : l5 interchangeable and entirely replaceable UDit, co~prising a substan-lally rigid casing, for example of~ cardboard,~plastics~material or : :~ the like,~having R cros3-sectlonal shape corresponding to that o~
~he duct lnto whlcb it is lnsert&d, but of slightly smaller : dlmenslons.
20 On thP outside of said casing there~ i8 provided a covering of Elexible aterial,: for examp~le foamed ma;~erlal, whlch tapers towards the rear end in~order~to acilitate~1nsertlon~of~the~fl1ter unlt~into the duct, and of dimension~ such as ~o form~a forsed and retention Eit ln the duct.
~: 2S Ingide the caslng there is provided~, according:to the~:present lnven-tion~ a series of ele~nents of filter material and/or chemlcal products and possibly electrostatic devices or the like, disposed ln a .~
:, :
. .
predetermined order so as to obtaln complete flltration and pur$fl-catlon of the indrawn air both with regsrd to dust and mist eliml-na~ion, and with regard to the elimination of pollu~ant gas.
In the con~idered embodlmen$, in the air flow direction a first 5 element constituted by an inertial separating filter for retainlng coarse solid partlculate matter i3 followed by a perlmetral spacer ~o ensble the air stream to attain uniform dlstribution, a ~econd element constltuted by an inertial separaclng filter of finer type for solid particulate matter of smaller diameter, a third element 10 constituted by an absolute ~psrating filter or a sieve for retaining ~he smallest partlcles pre~ent in the st~eam, a four~h fiIter element constituted by one or more of ~he following types in combinatlon ~ith each other: a bed of granùlar ad~orbent ~olids and/or ~elec~ive molecular sieves for the removal of most of the main pollu~ant gases lS ~uch as S03, C02, N0, and a fiEth fileer element constltuted by a catalyst for mainly removing C0.
A filter element can also be ~mpregnated wlth deodorant ~ubstance3 o~ mlxed with deodorant granular particles for the elimlnation of bad odours from the automobile passenger compartment.
: 20 According to the invention, the v$rious fiIter elements forming the unit are of such thlckness and:tor ma~erial and/or operating conditions that ~lieir degradation and llfa, in relation;to the filtering capacity o~ each individual element,;are substantlally the~same for all, : ~ :
25 Means are also prov$ded for ~acil~ita~lng grlpping of ~he filter unit and its removal for replacement purposes, and means or checking the.
state of efficlency of aach indlvidual f~ r element or of all the .,. ~. .
~26~44 elements overall. Said checking mean~ can be constituted for example by warning s~rips or tapes which are either separate Prom each other or are joined together at that end whlch projects from the unit, and are dlsposed to ~he rear of each filter element, and preferably in 5 a transverse direction, so as to be traversed by a significant air flow, and further having such dimensions and characterlstic~ as ~o be put under the same conditlons as the respective filter element and to indicate lts efPective state of efficiency.
The means for checking the state of efficiency of the f~lter unit 10 can also comprlse, possibly as an alternative, a device for measuring the pressure difference between the upstream and downstream side of the filter unit, and constituted for example by a tube which axially traversea all the elements Df the filter unlt and i9 associa~ed, at one of its two ends, with a diaphragm ~ensitive to the pressure 15 difference created betweerl the upstream and downstream end o~ the fllter unit as a fun~tion of its overall d~gree of clogging. The deorma~ion of the diaphragm caused ~by the clogging operates known means for checking and indicatlng the state of efficlency, snd simultaneously operates,~for predetermined limiting values, means 20 for stopping the operation of the motor vehicle fan in order to pre~ent it becoming dama&ed in the ab~ence of the air Plow.
IE ~aid diaphragm~associated wlth the~ax~ial~tube ls disposed to thP
front of ~he fllter unlt so as to be able to be inspected from the oo~side by direct vlewing oP ~the front end of the unit, means can 25 be provided for blocking the limlting deformation attained by the diaphragm, ~r alternatively the diaphragm can be sized ~n juch a manner as to cause it to rupture on attaining a predeterm~ned ',: `'' : ' . :
. ' ,,, , ,. ~ `' "" ' 4~
limiting deormation indicative of overall clogging of the filter unit.
Accoridng to a further preferred embodiment, the filter unit when for closed ~nvironments or air conditioning ~ystems comprlse~
5 preferably a casing provided with a flange containing holes for screws for its fixing to a f$xed s~ructure, for example for its fixing to the inlet port of an air conditioner or to 8 hole in a glass pane, wall or the like, and possibly a seal ga~ket of known type for its application to the glass pane or wall.
10 Said filter unit can be formed from the same filter elements a~ ~hose heretofore descrlbed, or alternatively as there are no longer any overall dimensional or feed requlrements, one of the inertial aeparating filter elements can be replaced or flanked by a fixed electrostatic precipitator connected to the electricity mains, and 15 said filter unit can be ass~ciated with a Pan for creating the air change clrculation, should said fan not already exist.
According to the invention, there are al50 provided means for checking the state o~ efficiency of the~individual filter~elements or of the : entlre overall unit, soch as warniDg tapes or strips, or means to 20 allow direct ~iewing through the~transparency of the outer casing or through an axial ~lot formed ln the ca~lng.
D~SCRIPTION OF THE D~AWINGS
; These and further characteristics will be apparent from the detailed descriptivn given hereinafter by way of non-limiti~g example, with e5 reference to the accompanying figure~ in which:
~lgure 1 is a diagram~atic represen~ation of the filter unit inserted into a horizontal-axiæ air lnle~ por:t of an automoblle;
,.
. . .
' ;
6~
Figure 2 ls a diagrammatic representation of th~ filter unit inserted into a vertical-axis air lnlet port of an autom~bile;
~igure 3 is an axial sectlon through the filter u~it; and Figure 4 shows a fllter uni-t for closed environmerlts.
5 DETAILED D~SCRIPTION
F~gures 1 and 2 are a diagrammatlc representation of the front ~one of a motor vehicle in which the main air inlet for the internal ventilation is generally disposed inside the englne compartment 1, below the hood in a position corr~sponding with substantially hori-lO zontal air lnlet apertures 3 di~posed for example at the base of thewindscreen 4.
In the arrangement shown in Figura 1, below $he air lnlet apertures 3 there is situat~d 8 box 5 lnto which the air is conveyed from the outside. Any water is discharged through the outlet 5a, : 15 In the arrangament shown in Figure 2, below the ~ir inlet apertures 3, there is provided a-cap 6 of vertical~axis for conveying away Erom the air lnlet mouth any water whl;ch has eneered fro~ the aper-:tures.
In the b~x 5 or below ~he cap 6 there is provided a duct 7 in which 20 there is disposed an electric fan 8 which draws the external air from the mouth end of the duct 7 in order to feed lt throogh ducting 9 to the automobile ventilation system.
The multiple filter unit of tbe present inven~ion, lndicated overall by 10 and shown in detail in Figure 3, is located in the initial part 25 of the duct 7.
Said ilter unit lO is inserted as a complete unit and is interchange-able and completely replaceabie without requirlng any particular :.
~6~4 mechanical intervention.
With reference to Figure 3, the filter unit 10 is constituked by a substantially rigid oasing 11, for example of cardboard, plastics material or the like, having a cross-se~tion corresponding to that of the duct 7 into which lt is inser~ed, but with slightly smaller dimensions.
On the outside of said casing 11 there is provided a layer of flexible material 12, for example foamed plastlcs material, which slightly tapers towards the rear end o~ the ca~ing 11 and is o~
such dimensions a~ to produce a forced fit inside ~he duct 7 when the unit 10 is inserted therein starting from the taperçd end to facilitate its en~ry, and to create sufXicient elastic pressure on ~he ~alls of the duct 7 to retain the filter unit 10 in position.
Inside the casing 11 there is provided a series of elements of fllter material andtor chemical products, and possihly electrostatic devices or the like, dlsposed in a predeter~lned order in order to obtain complete filtration and purificatlon of the indrawn air.
The ~ilter unit 10 comprlses, ~isposed ln the air flow direction in accordance wlth the arrow ~, a first ele~ent 13 constltuted by an inartial separating filter, for example of the labyrinth type, provided ~or retaining coarse solid particulate matter of diameter greater than one~ mi~ron, while at the same time able to offer the least possible resistance to the passage of the air, and having a high dust storage capacity. Preferably, it has been found that a filter element, for example of the polyurethane foam type, with 25 passages per cm2 and an axial thickness of about 6 mm B
`
..
"
~26~
ls sufficient for the purpsse.
A perimetral spacer 14 of known type enables the air which has passed througb the first filter elemene 13 to regain a certain degree of unlformlty for improved efficiency of the subsequent filtering S layers.
A second elemPnt ]5 is constituted by a further inertlal separating filter of smaller passages, downstream of which the pa~ticulate matter suspended ln the fluid stream is of diameter l~ss than one micron. Preferably, it has been found that a filter ele~ent, Eor 10 example of the polyurethane foam typ~, with 40 passages per cm2 and an axial thickness of about 6 mm is sufflcient for the purpose.
A third filter element 16 is constituted by an absolu$e separating filter, for example of sintered eextile fibre~ or woven glass fibres~
with high separ~tion power, for retaln~ng the smaller residual 15 particles preseot in the stream.
A~fourth filter element 17 is constituted by adsorben~ solids for removlng~certaiD pollutant gases3 fa~ty constit~ents of the alr and bad odours. Preferably, it has been fou~d that selective granular beds, for e~ample of activated carbon, with an axial thickness of 20 20 mm are suff~cient for the purpose.
As an alternative to, or in comb mation with the adsorbent solids, the fourth element can for example be a &ranular mixture of ASCARlT ~ and lithium hydroxide on an asbestos base for adsorbing a large proportion of the acid pollutant gases such as S02, S03, C0 , 25 N0 and, partially, C0. Preferably, it has been found that a layer Oe 20 mm axial thickness is sueficlent for the purpose.
Furthermore, as an alternative eo or in combination with the preceding, , ...
~2~i~at4A~
~ 0 27637-1 the fourtb Eilter element 17 can be constltuted hy a molecular sieve selective for particular chemical compounds.
A fifth filter element 18 is constituted by a catalyst, the purpose of which is to fix the residual pollutant substance, particularly CO, in the form of a compound by chemical reaction.
Each of the aforesaid filters can be formed from a number of layers selective for di~ferent substances.
Furthermore according to the invention, one of the fllter elements can be impregnated with a deodorant substance or mixed with deodorant granular particlesl in order to eliminate bad odours inside the automobile.
On the fron~ end of ~he casing 11 there ls providedr rigid therewith, a transverse bar 19 provided with a gripping ring or the like l9a, for extracting the filter unit 10 from the duct 7 when the unit 10 is to be replaced.
The various filter elements forming the filter unit 10 are of such thickness and~or material and/or operating conditions that ~oth their degradation and their life in re~ation to the filteriny capacity o~ each element are substan~ially the sa~e for all.
The life and/or the state of efficiency of each individual element or of all the elements which overall form the filter unit 10 can be checked by inserting behind each iilter element 13, 15, 16, 17 and 18 a warnLng strip or tape which is of such material and dimensions as to behave as the filter element itsel~ or to be influenced by it in relation to the residual degree of effic.iency o~ the element. For example, on the rear o~ the ~irst fLlter element 13 there is disposed a warnin~ strlp or tape 13a composed of the same material as the element 13 itself, but suitably , ",' 4a~
decoloured or coloured so that as the air passage pores of ~he inertial separating filter 13 become clogged, the warning tape or strip 13a changes colour in relation to the retained solid particles until a limitin~ check colour iB attained, this being prede~erminecl by the manufacturer and suitably indicated in the instruc~ions or in a suitable space on the casing 11.
rhe same procedure is followed for checking the state of efficiency of the other layers 15, 16, 17, 18 by respective warning tapes or strips 15a, 16a, 17a, 18a placed on their rear.
`In order to put said warning strips or tapes 13a to 18a under ~he same condikions as the respective filter element 13 to 18 and thus able to indicate the effective state of efficiency of the elements themselves, the warning tapes or strips can preferably be disposed transversely through a length such as to be traversed by a significant air flow.
The user can check the state of efficiency of the ent.tre filter by extrac~ing said warning tapas or strips one at a ti~e at different times until one of them shows the limitlng coloration conditions indicated by the manufacturer, this signifying, on the basis of the aforegoing, tha~ all the other layers are also substantially in the same state of efficiency.
It ls also possible to simultaneously extract all the warning tapes or strips by connecting them together at the ends which project to the outside by means of a common grip 20, to thus be able to simultaneously check ~he state of effi.ciency ,~
of each of the fi.lter elements. In thi6 case~ 1t is nectssary to insert more than one set of warning tapes or strips to be extracted for checking purp4ses at different times during the u~e of the filter unlt lO.
5 As a modification, the state of efficiency of ~he filter uni~ lO can be checked by disposing a tube 21, for example of pla~tics material, which passes axially through all the elements of the filter unit lO
and ls associaced at one of its two ends with a diaphragm Z2 sensitive to increasP in the pressure dlfference created between the upstream lO and downstream ends of the filter unit lO by virtue of lts progressive clogglng, said diaphragm deforming as a function of this until a limiting deformation is reached on to~al clogging. The diaphragm 22 is associated with known electrical, visual or acoustic means for checking and di~playing the deformation, and thus for indicating 15 when ~he limi~ing deformation is~attained, to lndicate the ~tate of efflciency of the filter unit lO.~ Simul*aneously with its attaining of ll~1ting deformation, and thus of total clogging of the filter :unit lO, ~hlch results in reduced alr pas~age,:~aid diaphragm 22 operate~ means for stopping the operation of the vehicle electric 20 fan 8, in order to prevent its operation under said conditlons, thus preventing it becoming damaged.
If the diaphragm 22 is disposed at the front end of the axial tube 21, projecting from the filter unit lO, ~t can be inspected directly from the outside and it is possible t~ check when the filter unit lO
25 has become completely spent, either by the fact of the diaphragm 22 rupturing, it being si~ed for a determined limitlng pressure : difference value, or by the fact of the diaphragm deformation having , .
: .. , , ' ::
: .- .. ,;;. . .
:::
~.26~49L
attained a limitiIlg position and having been blocked thereat, for example by elastic retention or the like.
This therefore prevents the filter uni~ 10 be~ng able9 due to forgetfulness or neglect on the part of the user, to remain in the 5 intake duct 7 after lt has become completely spent and no longer exerts lts filtering and purifying acti~n, and preventing or reducing passage of the ventilation air int~ the automobile, and creating both discomfort for its occupants and the dan8er of da~age to the automobile f an should this be put into operatlon.
10 With reference to Figure 4, according to a further embodiment and application of th~ invention, the filt~r unit 30 is constituted by a substantially rigid outer casing or body 31, for example of metal, plastics materlal or the like, having a cross-section of suitable shape for fitting into seats provided either on a wall vr on a glass 15 pane. The casing 31 is preferably provided with a flange 31a with holes for the passage of screws or the like for its connection to the fIxed structure, and seal gaskets of known type.
A Iow-speed fan 32 for creating the suctlon necessary for the opera-tion of the entire filter unit 30 is fixed in known manner inside 2a said outer rigid casing 31 and is connected to the electriclty mains.
The filteir unlt 30 for closed environment~s~can be formed with the same filter elements already de~crlbed for the motor vehicle filter unit IO or, as an~alternatlve to the second f$1ter element 15 constituted pref~rably by an inertial separating ilter, a current-25 fed electrostatic precipitator can be provided if there are nodimension problems or problems regarding the co}lec~ion of non-conductive dusts.
. . -.
In a further emhodiment of the filter unit 30 and with reference to Figure 4, the filter unit 30 con~ained in the outer casing or body 31 is formed from two parts 30' and 30" which are separated from each other by said fan 32.
The first filter unit 30' comprises an internal rigid casing 33 of cardboard, plastics material or the liks, surrounded by a layer of flexible material 34, for example plastics foam, of such dimensions as to create sufficient elastic pressure and form a forced fit against the walls of the outer casing 31.
Said inner rigid casin~ 33 comprises a first element 35 constituted by a coarse inertial separating filter, a perimetral spacer 36 and a second fil~er element 37 constituted by a current-fed electrostatic precipitator and/or a second finer inertial separating filter. Said first filter unit 30' can be removed ~o allow its reyeneration and thus its re-utilisation.
Downstream of the fan 32 there is a second filter unit 30"
comprising a second inner rigld casing 38 of cardboard, plastics material or the like, covered externally by a layer of flex1ble material 39, for example plastics foamr of such dimenslons a~ to create sufficient elastic pressure and constitute a forced fit against the lnner walls of the oute~ casing 31.
Said inner ri~id casing 38 comprises filter elements 40, 41, 42 which can be of the same type as the filter ele~ents 16, 17, 18 of the motor veh1cle filter unit 10.
Means are also provided for checkin~ the state of ef~iclency of ; the filter unit 30 either of the already described warnlng ~ape or strip type, or ~or example hy directly ",~. " ~
,, ~,' '' ~,, ~644~4 vlewlng, through apertures provided in the outer casing 31 and in the innPr casings 33 and 38, or through transparent casings, the colour assumed by ~he various elements of the filter unit 30, or other indications suitably provlded for by the manufacturer, together 5 with their relative instnlctions.
Obviously, if the filter unit of the present invention is to be provided for fittin~ into the inlet mouth of an air conditioning system or ai~ conditioners, it can be form~d from the same filter elements as already described, taking into constderation the fact 10 that the suction created by the air conditioner ltself is used for i~s operation, so that no fan 32 ~ill be required.
Numerous modifications can be made to the filter unit according to the invention, in relation to the number and the succession-arrangement of the filter elements, and in relation to their type, chemical 15 composition and formatlon, and ~ur~her in relation to their shape and dlmensions, but without~l~ea~ing the scope of the present invention.
:
' . .
: ~ , , .` ~ , .
::: ' .
Claims (21)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A multiple filter unit for motor vehicle ventilation and air conditioning systems, for introduction and stable insertion as a complete interchangeable unit into an air intake duct in motor vehicles, said filter unit comprising, a substantially rigid casing having a cross-sectional shape corresponding to that of the intake duct into which it is inserted, and of slightly smaller cross-sectional dimensions;
an outer, rearwardly tapering covering of elastic flexible material on said casing to enable said casing to be forced into and retained in said duct;
a series of filter elements constituted by mechanical and chemical filters disposed in a predetermined order for substantially complete filtration and purification of the air;
means for gripping and extracting the filter unit, said gripping means connected to the casing; and means for checking the state of efficiency of the filter unit.
an outer, rearwardly tapering covering of elastic flexible material on said casing to enable said casing to be forced into and retained in said duct;
a series of filter elements constituted by mechanical and chemical filters disposed in a predetermined order for substantially complete filtration and purification of the air;
means for gripping and extracting the filter unit, said gripping means connected to the casing; and means for checking the state of efficiency of the filter unit.
2. A filter unit as claimed in claim 1, wherein said series of filter elements includes in the fluid flow direction:
a first filter element constituted by a coarse inertial separating filter for coarse solid particulate matter of diameter greater than 1 micron;
a perimetral spacer;
a second filter element constituted by a finer inertial separating filter for solid particulate matter of diameter less than 1 micron;
a third filter element constituted by an absolute separating filter for retaining residual minor particles suspended in the flow;
a fourth filter element including means for eliminating pollutant gases;
a fifth element, constituted by a catalyst for eliminating residual CO.
a first filter element constituted by a coarse inertial separating filter for coarse solid particulate matter of diameter greater than 1 micron;
a perimetral spacer;
a second filter element constituted by a finer inertial separating filter for solid particulate matter of diameter less than 1 micron;
a third filter element constituted by an absolute separating filter for retaining residual minor particles suspended in the flow;
a fourth filter element including means for eliminating pollutant gases;
a fifth element, constituted by a catalyst for eliminating residual CO.
3. A filter unit as claimed in claim 2, wherein one of the filter elements includes a deodorant substance.
4. A filter unit as claimed in claim 2, wherein the individual elements of the filter unit are of such thickness and material and operating conditions that their degradation and life is substantially equal for all.
5. a filter unit as claimed in claim 4, wherein said checking means includes warning strips of the same material as the filters with colours for comparison purposes, and disposed to the rear of each individual element in a transverse direction, said strips having dimensions such as to be traversed by a significant air flow and being extractable individually for the periodical checking of the state of efficiency of the filters at successive times.
6. A filter unit as claimed in claim 5, wherein ends of the strips project out of the casing and are joined together to enable the strips to be extracted simultaneously for the periodical checking of the state of efficiency of the filter unit at successive times.
7. A filter unit as claimed in claim 4, wherein said checking means includes a tube which axially passes through all the elements of the filter unit and has at one of its ends a diaphragm sensitive to the increase in the pressure difference created between the upstream and downstream sides of the filter unit by virtue of its progressive clogging, said diaphragm being connected to at least one of electrical, visual, and acoustic means for checking and indicating deformation of the diaphragm and for signalling when a predetermined limiting deformation has been attainment said diaphragm also operating, simultaneously with the attainment of the limiting deformation on account of total clogging of the filter unit, means for stopping operation of a vehicle electric fan in order to prevent it being started under conditions which would cause it to become damaged.
8. A filter unit as claimed in claim 7, wherein said diaphragm is disposed at an upstream end of the axial tube to enable it to be directly inspected from the outside and to be able to know when the filter unit is completely spent by the fact of the diaphragm rupturing, where said diaphragm is sized for determined limiting pressure difference values.
9. A filter unit as claimed in claim 8, wherein said diaphragm is disposed at the front end of the axial tube so as to enable it to be directly inspected from the outside and to be able to be directly inspected from the outside and to be able to know when the filter unit is completely spent, by the fact of its becoming blocked by retention means in the position at which limiting deformation is attained.
10. A filter unit as claimed in claim 2, wherein said means for eliminating pollutant gases in said fourth filter element includes adsorbent solids.
11. A filter unit as claimed in claim 2, wherein said means for eliminating pollutant gases in said fourth filter element includes a selective molecular sieve.
12. A filter unit as claimed in claim 2, wherein said means for eliminating pollutant gases in said fourth filter element includes an adsorbent solid and a selective molecular sieve.
13. A multiple filter unit for closed environments, said filter unit comprising:
a rigid outer casing of a suitable cross-section for fitting into seats provided on a fixed structure, said casing including a flange with passage holes for screws for its fixing to the fixed structure, and including seal gaskets;
a filter unit assembly divided into two separate parts each contained in a rigid inner casing;
a low-speed electric fan disposed between the two filter units for creating the suction necessary for operation of the filter unit assembly, said two filter units forming an entire filter unit assembly.
a rigid outer casing of a suitable cross-section for fitting into seats provided on a fixed structure, said casing including a flange with passage holes for screws for its fixing to the fixed structure, and including seal gaskets;
a filter unit assembly divided into two separate parts each contained in a rigid inner casing;
a low-speed electric fan disposed between the two filter units for creating the suction necessary for operation of the filter unit assembly, said two filter units forming an entire filter unit assembly.
14. A multiple filter unit for closed environments as claimed in claim 13, wherein a first part of the filter unit assembly comprises:
a first inner rigid casing surrounded by a layer of flexible material of such dimensions as to create a sufficient forced and retention fit inside the rigid outer casing, said first inner rigid casing containing a first filter element constituted by a coarse separating filter, a peripheral spacer and a second filter element constituted by a current-fed electrostatic precipitator and by a second inertial separating filter, said first part of the filter unit assembly being removable to allow regeneration and thus re-utilization of the filter elements, and wherein D second part of the filter unit assembly comprises:
a second inner rigid casing surrounded by a layer of flexible material of such dimensions as to create a sufficient forced and retention fit inside the rigid outer casing, said second inner rigid casing containing a third filter element constituted by an absolute separating filter for retaining residual minor particles, a fourth filter element including means for eliminating pollutant gases, and a fifth filter element constituted by a catalyst particularly for eliminating CO.
a first inner rigid casing surrounded by a layer of flexible material of such dimensions as to create a sufficient forced and retention fit inside the rigid outer casing, said first inner rigid casing containing a first filter element constituted by a coarse separating filter, a peripheral spacer and a second filter element constituted by a current-fed electrostatic precipitator and by a second inertial separating filter, said first part of the filter unit assembly being removable to allow regeneration and thus re-utilization of the filter elements, and wherein D second part of the filter unit assembly comprises:
a second inner rigid casing surrounded by a layer of flexible material of such dimensions as to create a sufficient forced and retention fit inside the rigid outer casing, said second inner rigid casing containing a third filter element constituted by an absolute separating filter for retaining residual minor particles, a fourth filter element including means for eliminating pollutant gases, and a fifth filter element constituted by a catalyst particularly for eliminating CO.
15. A filter unit as claimed in claim 14, wherein said checking means includes means for checking the state of efficiency of each individual element of the unit, and constituted by warning strips with colours for comparison purposes, and disposed to the rear of each individual element in a transverse direction.
16. A filter unit as claimed in claim 14, wherein said means for eliminating pollutant gases in said fourth filter element includes adsorbent solids.
17. A filter unit as claimed in claim 14, wherein said means for eliminating pollutant gases in said fourth filter element includes a selective molecular sieve.
18. A filter unit as claimed in claim 14, wherein said means for eliminating pollutant gases in said fourth filter element includes an adsorbent solid and a selective molecular sieve.
19. A filter unit for closed environments, said filter unit comprising:
a rigid outer casing of a suitable cross-section for fitting into seats provided on a fixed structure, said casing including a flange with passage holes for screws for its fixing to the fixed structure, and including seal gaskets;
a filter unit assembly divided into two separate parts each contained in a rigid inner casing, said two separate parts forming an entire filter unit assembly for fitting into the inlet mouth of an air conditioning system, using for its operation suction created by said system.
a rigid outer casing of a suitable cross-section for fitting into seats provided on a fixed structure, said casing including a flange with passage holes for screws for its fixing to the fixed structure, and including seal gaskets;
a filter unit assembly divided into two separate parts each contained in a rigid inner casing, said two separate parts forming an entire filter unit assembly for fitting into the inlet mouth of an air conditioning system, using for its operation suction created by said system.
20. A filter unit as claimed in claim 19, wherein the state of efficiency of the filter unit can be checked by directly viewing the colour assumed by the various elements of the filter unit itself through apertures provided in the cuter and inner casings.
21. A filter unit as claimed in claim 19, wherein the state of efficiency of the filter unit can be checked by diaphragm means for measuring a pressure difference across the filter unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT48201A/84 | 1984-05-15 | ||
| IT48201/84A IT1179369B (en) | 1984-05-15 | 1984-05-15 | MULTIPLE FILTER GROUP, ESPECIALLY FOR VENTILATION AND AIR CONDITIONING SYSTEMS FOR MOTOR VEHICLES AND CLOSED ENVIRONMENTS, EQUIPPED WITH MEANS OF CONTROL OF EFFICIENCY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA1264444C CA1264444C (en) | 1990-01-16 |
| CA1264444A true CA1264444A (en) | 1990-01-16 |
Family
ID=11265176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000481439A Expired - Lifetime CA1264444A (en) | 1984-05-15 | 1985-05-14 | Multiple filter unit, particularly for ventilation and air conditioning systems for motor vehicles and closed environments, and provided with efficiency checking means |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4629479A (en) |
| EP (1) | EP0162022B1 (en) |
| JP (1) | JPS60255127A (en) |
| AT (1) | ATE62424T1 (en) |
| CA (1) | CA1264444A (en) |
| DE (1) | DE3582448D1 (en) |
| DK (1) | DK212485A (en) |
| ES (1) | ES8701510A1 (en) |
| GR (1) | GR851174B (en) |
| IT (1) | IT1179369B (en) |
| NO (1) | NO166171C (en) |
Families Citing this family (88)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3527732A1 (en) * | 1985-08-02 | 1987-02-12 | Esta Apparatebau | FILTER DEVICE |
| GB2189167B (en) * | 1986-04-15 | 1989-11-29 | Willpower Compressed Air Syst | Gas filter |
| US4702753A (en) * | 1986-04-21 | 1987-10-27 | Thaddeus Kowalczyk | Air purifier-combination filter |
| US4737173A (en) * | 1986-07-03 | 1988-04-12 | Amway Corporation | Room air treatment system |
| FR2601301B1 (en) * | 1986-07-12 | 1990-07-13 | Daimler Benz Ag | FRESH AIR INTAKE DEVICE IN A MOTOR VEHICLE. |
| CH672460A5 (en) * | 1987-05-21 | 1989-11-30 | Klaus Peter Hammes | |
| GB2218354B (en) * | 1988-02-04 | 1992-07-08 | Abraam Riad Ghobrial | The air cleaner |
| US4867764A (en) * | 1988-02-19 | 1989-09-19 | Mega/Erg Inc. | Convertible air cleaner fan |
| DE3839352A1 (en) * | 1988-11-22 | 1990-05-23 | Sueddeutsche Kuehler Behr | AIR CONDITIONER FILTER FOR A MOTOR VEHICLE |
| DE3902546C2 (en) * | 1989-01-28 | 1996-05-23 | Behr Gmbh & Co | filter |
| US5004487A (en) * | 1989-04-13 | 1991-04-02 | Thaddeus Kowalczyk | Filter assembly for protecting motor vehicle occupants from pollution |
| DE9005097U1 (en) * | 1990-05-04 | 1990-07-12 | Binz Gmbh & Co, 7073 Lorch, De | |
| US5131932A (en) * | 1990-09-11 | 1992-07-21 | Bionaire, Inc. | Filter replacement indicator |
| US5145494A (en) * | 1991-02-22 | 1992-09-08 | Sowinski Richard F | Method and means for filtering polychlorinated biphenyls from a gas stream |
| US5141533A (en) * | 1991-02-22 | 1992-08-25 | Sowinski Richard F | Method for filtering benzene from a gas stream |
| US5139543A (en) * | 1991-02-22 | 1992-08-18 | Sowinski Richard F | Method for filtering benz-a-anthracene from a gas stream |
| US5139542A (en) * | 1991-02-22 | 1992-08-18 | Sowinski Richard F | Method for filtering benzo-a-pyrene from a gas stream |
| US5149343A (en) * | 1991-02-22 | 1992-09-22 | Sowinski Richard F | Method for filtering radon from a gas stream |
| US6340381B1 (en) * | 1991-12-02 | 2002-01-22 | Ebara Research Co., Ltd. | Method and apparatus for the preparation of clean gases |
| US5269723A (en) * | 1992-01-27 | 1993-12-14 | Bender Gene R | Vehicle air freshener |
| RU2026751C1 (en) * | 1992-05-13 | 1995-01-20 | Елена Владимировна Володина | Device for sterilization and fine gas filtration |
| IT1259151B (en) * | 1992-09-07 | 1996-03-11 | FILTER STRUCTURE FOR VEHICLE INTERIOR DUCTS | |
| EP0672445B1 (en) * | 1992-12-02 | 1998-03-25 | Ebara Corporation | Method and apparatus for preventing contamination of substrate or substrate surface |
| US5922105A (en) * | 1992-12-02 | 1999-07-13 | Ebara Research Co., Ltd. | Method and apparatus for the preparation of clean gases |
| FI92290C (en) * | 1992-12-11 | 1995-09-13 | Jaakko Raippalinna | smoking room |
| SE9501369D0 (en) * | 1995-04-12 | 1995-04-12 | Curt Lindhe Konsult & Foervalt | Multiple filter unit |
| US5904896A (en) * | 1995-12-08 | 1999-05-18 | A. R. Grindl | Multi-stage zonal air purification system |
| JPH10106908A (en) * | 1996-10-01 | 1998-04-24 | Mitsubishi Electric Corp | Generating device for chemical free dry air |
| JP3405439B2 (en) | 1996-11-05 | 2003-05-12 | 株式会社荏原製作所 | How to clean solid surfaces |
| DE19723914A1 (en) * | 1997-06-06 | 1998-12-10 | Dillinger Stahlbau | Catalyst for the decomposition of hydrogen peroxide carried in a fluid and installation for using the catalyst |
| PL190125B1 (en) * | 1997-06-13 | 2005-11-30 | Hoelter H | Ionisation-type filter for purification of air |
| SE512436C2 (en) * | 1997-10-06 | 2000-03-20 | Volvo Wheel Loaders Ab | Air conditioning for vehicles |
| FR2769265B1 (en) * | 1997-10-07 | 1999-12-24 | Chausson Service | METHOD AND DEVICE FOR DETECTING THE STATE OF AN AIR FILTER IN A HEATING AND / OR AIR CONDITIONING INSTALLATION OF THE INTERIOR OF A MOTOR VEHICLE |
| JP3700905B2 (en) * | 1998-05-06 | 2005-09-28 | 豊田合成株式会社 | Air cleaner |
| EP1105203B1 (en) * | 1998-08-20 | 2004-01-28 | Extraction Systems, Inc. | Filters employing porous strongly acidic polymers |
| JP3933317B2 (en) * | 1998-08-24 | 2007-06-20 | ゼオン化成株式会社 | Filter device for electrophotographic apparatus |
| US6152990A (en) * | 1999-02-04 | 2000-11-28 | Engelhard Corporation | Device for removing and retaining volatile compounds and method of employing the same |
| DE29911534U1 (en) * | 1999-06-28 | 1999-09-09 | Sommer Allibert Lignotock Gmbh | Air vent for heating or air conditioning in a motor vehicle |
| US6264727B1 (en) * | 1999-07-20 | 2001-07-24 | Robert L. Elmore | Filter fan |
| US6296693B1 (en) * | 1999-09-17 | 2001-10-02 | Mccarthy Walton W. | Life cell |
| US6464761B1 (en) * | 1999-12-22 | 2002-10-15 | Visteon Global Technologies, Inc. | Air induction filter assembly |
| US7540901B2 (en) * | 2000-05-05 | 2009-06-02 | Entegris, Inc. | Filters employing both acidic polymers and physical-adsorption media |
| JP5595627B2 (en) * | 2000-05-05 | 2014-09-24 | インテグリス・インコーポレーテッド | Filters that use both acidic polymers and physisorption media |
| US6551383B1 (en) * | 2000-05-15 | 2003-04-22 | Agfa Corporation | Filtration system for collecting and filtering particles and fumes from ablative imaging plates |
| DE10047068A1 (en) * | 2000-09-22 | 2002-04-18 | Behr Gmbh & Co | Filter for heater/air conditioning system for motor vehicles has two filter layers enclosing intermediate space filled with sound-absorbent material |
| US20040139858A1 (en) * | 2001-03-01 | 2004-07-22 | Phillips Plastics Corporation | Filtration media of porous inorganic particles |
| US7041159B2 (en) | 2003-08-04 | 2006-05-09 | Phillips Plastics Corporation | Separation apparatus |
| JP2004528160A (en) | 2001-03-01 | 2004-09-16 | フィリップス・プラスチックス・コーポレーション | Filtration media for porous inorganic particles |
| JP3969082B2 (en) * | 2001-08-10 | 2007-08-29 | 株式会社デンソー | Blower for vehicle |
| GB2381216B (en) * | 2001-10-26 | 2005-05-11 | Agco Sa | Air conditioning filter |
| US6959696B2 (en) | 2002-04-12 | 2005-11-01 | Briggs & Stratton Corporation | Internal combustion engine evaporative emission control system |
| US20040103789A1 (en) * | 2002-11-29 | 2004-06-03 | Lan Chin I. | Fume-treating device and fume ducting system for cooker hoods |
| US7166140B2 (en) | 2003-10-22 | 2007-01-23 | Phillips Plastics Corporation | High capture efficiency baffle |
| US20050089455A1 (en) * | 2003-10-24 | 2005-04-28 | Marganski Paul J. | Gas-using facility including portable dry scrubber system and/or over-pressure control arrangement |
| EP1722830A1 (en) * | 2004-02-24 | 2006-11-22 | Givaudan SA | Air purifier and volatile liquid disseminator |
| US7185640B2 (en) | 2004-11-05 | 2007-03-06 | Briggs & Stratton Corporation | Integrated fuel tank and vapor containment system |
| US7086390B2 (en) | 2004-11-05 | 2006-08-08 | Briggs & Stratton Corporation | Integrated fuel tank and vapor containment system |
| JP2006305508A (en) * | 2005-04-28 | 2006-11-09 | Nippon Muki Co Ltd | Apparatus for mounting air filter and air filter |
| GB2426942A (en) * | 2005-06-11 | 2006-12-13 | Patrick Treves | An air filtration system |
| US7435289B2 (en) | 2005-09-27 | 2008-10-14 | Briggs & Stratton Corporation | Integrated air cleaner and vapor containment system |
| US7281525B2 (en) | 2006-02-27 | 2007-10-16 | Briggs & Stratton Corporation | Filter canister family |
| US7594960B2 (en) * | 2006-05-26 | 2009-09-29 | 3M Innovative Properties Company | Method and apparatus for monitoring the condition of a flexible filter |
| US7713339B2 (en) * | 2006-05-26 | 2010-05-11 | 3M Innovative Properties Company | Filter change indicator |
| US9120043B2 (en) * | 2006-05-30 | 2015-09-01 | 3M Innovative Properties Company | Filter sensor |
| US20080006268A1 (en) * | 2006-07-07 | 2008-01-10 | David Hanlon | Helmet Having A Filter |
| TWI417130B (en) * | 2006-07-13 | 2013-12-01 | Entegris Inc | Filtering system |
| SE530041C2 (en) * | 2006-07-14 | 2008-02-12 | Freshman Ab | Air filter arrangement and a method for manufacturing such an air filter arrangement |
| US20080113602A1 (en) * | 2006-11-09 | 2008-05-15 | Norman Golm | Microbial resistant vehicle air conditioning ductwork |
| GB0707056D0 (en) * | 2007-04-12 | 2007-05-23 | Givaudan Sa | Dual-purpose device |
| US8152887B2 (en) * | 2008-12-15 | 2012-04-10 | Mann + Hummel Gmbh | Air/oil separator |
| JP5331545B2 (en) * | 2009-04-06 | 2013-10-30 | 京セラドキュメントソリューションズ株式会社 | Filter member and image forming apparatus to which the filter member is applied |
| US20100132320A1 (en) * | 2010-01-27 | 2010-06-03 | Ali Sharifi | Air pollution dry cleaning apparatus |
| US8814144B2 (en) * | 2010-04-08 | 2014-08-26 | Johnnie McTaw, Jr. | Air register assembly |
| US20120000566A1 (en) * | 2010-07-01 | 2012-01-05 | Millipore Corporation | Rigid disposable flow path |
| JP5484362B2 (en) * | 2011-01-13 | 2014-05-07 | 日立建機株式会社 | Outside air introduction device for air conditioner for work equipment |
| US9358494B2 (en) * | 2011-12-12 | 2016-06-07 | 3M Innovative Properties Company | End of service life indicating systems for layered filter cartridges |
| DE102013100507A1 (en) * | 2012-05-30 | 2013-12-05 | deconta GmbH | Mobile device for filtering air |
| EP2969128B1 (en) * | 2013-03-15 | 2018-11-14 | 3M Innovative Properties Company | End of service life indicating systems for layered filter cartridges |
| WO2015129914A1 (en) * | 2014-02-28 | 2015-09-03 | ナブテスコオートモーティブ 株式会社 | Oil separator |
| US9320999B2 (en) * | 2014-05-07 | 2016-04-26 | Ned Abell | Method and device for removing airborne pollutants |
| DE102015200996A1 (en) * | 2015-01-22 | 2016-07-28 | Ford Global Technologies, Llc | Method and device for monitoring the service life of a filter |
| US10376824B2 (en) * | 2016-03-22 | 2019-08-13 | Ecological World For Life S.A.S. | Mechanical system to capture and transform contaminant gases, and method to purify air |
| EP3372295A1 (en) * | 2017-03-06 | 2018-09-12 | Carl Freudenberg KG | Supply air assembly for a mobile device |
| US10428713B2 (en) | 2017-09-07 | 2019-10-01 | Denso International America, Inc. | Systems and methods for exhaust heat recovery and heat storage |
| DE102018104517A1 (en) * | 2018-02-28 | 2019-08-29 | Eberspächer Climate Control Systems GmbH & Co. KG | Combustion air blower |
| CN111375303B (en) * | 2019-12-24 | 2020-11-06 | 广州澳企实验室技术股份有限公司 | Environment-friendly machine for removing chemical gaseous pollutants in laboratory air |
| CN111521530B (en) * | 2020-05-25 | 2024-01-05 | 暨南大学 | Particulate pollutant release simulation system and pollutant collection method thereof |
| WO2022008952A1 (en) * | 2020-07-06 | 2022-01-13 | Ecological World For Life S.A.S. | System for capturing no 2 from air with non-catalytic solid chemical converters |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1318259A (en) * | 1962-03-23 | 1963-02-15 | Transportable device intended for air purification in premises | |
| DE7302084U (en) * | 1973-01-20 | 1973-06-20 | Cremer N | Device for supplying fresh air, in particular heatable fresh air, into the interior of motor vehicles |
| GB1417528A (en) * | 1973-12-28 | 1975-12-10 | Suzuki Co Ltd Y | Air cleaning device |
| DE2846036A1 (en) * | 1978-10-23 | 1980-05-08 | Hoelter Heinz | Air supply filter for the interior of motor vehicles - uses several layers of chemical sorption agents and has low mfg. cost |
| US4253852A (en) * | 1979-11-08 | 1981-03-03 | Tau Systems | Air purifier and ionizer |
| FR2522791B1 (en) * | 1982-03-05 | 1986-08-29 | Loubet Eliane | CONTROL EQUIPMENT FOR AIR CONDITIONING PRESSURIZERS, PARTICULARLY FOR WORKING CABINS IN POLLUTED ATMOSPHERE |
| JPS58158434A (en) * | 1982-03-17 | 1983-09-20 | Matsushita Electric Ind Co Ltd | Display device for loading of air filter in air conditioner |
-
1984
- 1984-05-15 IT IT48201/84A patent/IT1179369B/en active
-
1985
- 1985-05-10 DE DE8585830112T patent/DE3582448D1/en not_active Expired - Fee Related
- 1985-05-10 AT AT85830112T patent/ATE62424T1/en not_active IP Right Cessation
- 1985-05-10 EP EP85830112A patent/EP0162022B1/en not_active Expired - Lifetime
- 1985-05-14 DK DK212485A patent/DK212485A/en not_active Application Discontinuation
- 1985-05-14 CA CA000481439A patent/CA1264444A/en not_active Expired - Lifetime
- 1985-05-14 NO NO851922A patent/NO166171C/en unknown
- 1985-05-14 US US06/733,801 patent/US4629479A/en not_active Expired - Fee Related
- 1985-05-14 GR GR851174A patent/GR851174B/el unknown
- 1985-05-14 ES ES543119A patent/ES8701510A1/en not_active Expired
- 1985-05-15 JP JP60101641A patent/JPS60255127A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| NO166171C (en) | 1991-06-12 |
| DE3582448D1 (en) | 1991-05-16 |
| GR851174B (en) | 1985-11-25 |
| ES543119A0 (en) | 1987-01-01 |
| US4629479A (en) | 1986-12-16 |
| NO851922L (en) | 1985-11-18 |
| ES8701510A1 (en) | 1987-01-01 |
| NO166171B (en) | 1991-03-04 |
| CA1264444C (en) | 1990-01-16 |
| EP0162022A2 (en) | 1985-11-21 |
| JPH027686B2 (en) | 1990-02-20 |
| EP0162022B1 (en) | 1991-04-10 |
| DK212485D0 (en) | 1985-05-14 |
| ATE62424T1 (en) | 1991-04-15 |
| DK212485A (en) | 1985-11-16 |
| EP0162022A3 (en) | 1987-05-27 |
| IT8448201A0 (en) | 1984-05-15 |
| JPS60255127A (en) | 1985-12-16 |
| IT1179369B (en) | 1987-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1264444A (en) | Multiple filter unit, particularly for ventilation and air conditioning systems for motor vehicles and closed environments, and provided with efficiency checking means | |
| US6758873B2 (en) | Aerosol separator and method | |
| CA2390060C (en) | Portable motor vehicle cabin air purifier | |
| US6187073B1 (en) | Air cleaner; aerosol separator; and method | |
| CA2080558A1 (en) | Air Purifier Pleated Filter to Stop Pollution for Passenger Inside of the Motor Vehicle | |
| GB2109268A (en) | Gas purifiers | |
| CZ290853B6 (en) | Multiple-element air filtering unit | |
| EP0102593A2 (en) | Filter System | |
| GB2349104A (en) | Filter assembly | |
| RU2336929C2 (en) | Air clearing ecological system filtration assembly | |
| CN201020330Y (en) | Filtering device for improving vehicle internal environment | |
| KR0145808B1 (en) | Apparatus and method for air-purifying in automobiles | |
| JPH0443685B2 (en) | ||
| KR0155244B1 (en) | A filter for removing dust | |
| CN217477048U (en) | Vehicle-mounted air purifier | |
| Dong | Design of a filtering car air purifier | |
| CN217944851U (en) | Air purification device reaches vehicle including it and includes its air conditioner | |
| JP2978986B2 (en) | Exhaust gas purification device | |
| CN102966415A (en) | Motor vehicle exhaust purifying device | |
| CN2179835Y (en) | Air purifier at air inlet of automobile air conditioner | |
| EP1066455A1 (en) | Exhaust gas filter temporarily arranged at a vehicle exhaust pipe | |
| PL127169B1 (en) | Apparatus for aspiration and purification of contaminated air | |
| RU2088315C1 (en) | Device for purifying air | |
| JPH0889748A (en) | Filter unit | |
| MXJL03000003A (en) | Polluted ambient air filtering and purifying device. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 19950716 |
|
| MKLA | Lapsed |
Effective date: 19950716 |