US20110236228A1 - Fan - Google Patents
Fan Download PDFInfo
- Publication number
- US20110236228A1 US20110236228A1 US13/052,830 US201113052830A US2011236228A1 US 20110236228 A1 US20110236228 A1 US 20110236228A1 US 201113052830 A US201113052830 A US 201113052830A US 2011236228 A1 US2011236228 A1 US 2011236228A1
- Authority
- US
- United States
- Prior art keywords
- fan
- filter unit
- filter
- air outlet
- casing
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/084—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation hand fans
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
- F04D29/646—Mounting or removal of fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
- F24F1/022—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
- F24F1/04—Arrangements for portability
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
- F05D2260/33—Retaining components in desired mutual position with a bayonet coupling
Abstract
A portable fan includes a casing having an air inlet, and an air outlet having an interior passage for receiving an air flow, and a mouth for emitting the air flow, the interior passage extending about an opening through which air is drawn by the air flow emitted from the mouth. The fan includes an impeller and a motor for rotating the impeller to generate an air flow between the air inlet and an air outlet which has a static pressure of at least 150 Pa downstream from the impeller. A filter unit is detachably connected to the casing. A filter of the filter unit is located upstream of the air inlet to remove airborne particulates from the air flow before it enters the casing.
Description
- This application claims the priority of United Kingdom Application No. 1004813.0 filed Mar. 23, 2010, the entire contents of which are incorporated herein by reference.
- The present invention relates to a portable fan. Particularly, but not exclusively, the present invention relates to a floor or table-top fan, such as a desk, tower or pedestal fan.
- A conventional domestic fan typically includes a set of blades or vanes mounted for rotation about an axis, and drive apparatus for rotating the set of blades to generate an air flow. The movement and circulation of the air flow creates a ‘wind chill’ or breeze and, as a result, the user experiences a cooling effect as heat is dissipated through convection and evaporation. The blades are generally located within a cage which allows an air flow to pass through the housing while preventing users from coming into contact with the rotating blades during use of the fan.
- The use of fans in hospitals to keep patients cool is widespread, both in general wards and in isolation wards. For example, depending on the medical condition of the patient it may be preferable to reduce the body temperature of the patient using a fan rather than by using pharmaceuticals. When a fan is assigned to a patient, generally that fan is treated as an item of medical equipment and so, like other medical equipment, will require frequent cleaning by a nurse or other hospital employee. The cleaning of bladed fans can be time consuming for the employee, as the cage housing the blades of the fan needs to be disassembled before the blades of the fan can be cleaned. This disassembly usually requires the use of a screw driver, which cannot be carried by a nurse on a hospital ward. Often, it can be more convenient for the hospital to engage a specialist cleaning company to clean the fan off site, although this can be very expensive.
- WO 2009/030879 describes a fan assembly which does not use caged blades to project air from the fan assembly. Instead, the fan assembly comprises a base which houses a motor-driven impeller for drawing a primary air flow into the base, and an annular nozzle connected to the base and comprising an annular slot through which the primary air flow is emitted from the fan. The nozzle defines a central opening through which air in the local environment of the fan assembly is drawn by the primary air flow emitted from the mouth, amplifying the primary air flow.
- The time required to clean off the external surfaces of this type of “bladeless” fan is much shorter than that required to clean a fan having caged blades, as there is no requirement to dismantle any parts of the fan to access any exposed parts of the fan. For example, the external surfaces of the fan may be wiped clean using a cloth. While this level of cleaning may be sufficient for bladeless fans which are assigned to patients on general wards, when the bladeless fan is assigned to a patient in an isolation ward or infection containment ward there remains a need to keep the internal components of the base clean to avoid cross-contamination when the fan is assigned to another patient.
- The present invention provides a portable fan comprising a casing having an air inlet; an air outlet comprising an interior passage for receiving an air flow, and a mouth for emitting the air flow, the interior passage extending about an opening through which air is drawn by the air flow emitted from the mouth; an impeller and a motor for rotating the impeller to generate an air flow between the air inlet and an air outlet which has a static pressure of at least 150 Pa downstream from the impeller; and a filter unit detachably connected to the casing, the filter unit comprising a filter located upstream of the air inlet.
- The filter unit is preferably in the form of a disposable filter unit which can be replaced when, for example, the fan is assigned to a different patient, when the fan is moved with the patient from an isolation ward to a general ward, or when the filter has reached the end of a prescribed usage period. This can significantly reduce the costs associated with the use of the fan, as the frequency with which the fan may need to be taken off site for cleaning can be significantly reduced. The fan is arranged to generate an air flow with a static pressure of at least 150 Pa, preferably in the range from 250 to 1.5 kPa, so that the air flow is not choked when the filter unit is attached to the casing.
- The filter unit may be locatable over or around the casing so that the filter is located upstream from the air inlet of the casing to remove airborne particulates from the air flow generated by the impeller before the air flow enters the casing. The filter unit is preferably manually connectable to the casing to allow a user to attach the filter unit to the fan, and subsequently detach the filter unit from the fan, without the need for a tool.
- The filter preferably comprises a high energy particle arrester (HEPA) filter. The filter may also comprise one or more of a foam, carbon, paper, or fabric filter. The filter preferably has a surface area in the range from 0.5 to 1.5 m2 which is exposed to the air flow generated by the fan. To minimize the volume of the filter, the filter is preferably pleated to form a filter which is substantially annular in shape for surrounding the air inlet of the casing. In this case, the filter unit may comprise two annular discs between which the filter is located. These discs can be easily wiped clean during use of the filter unit. Each disc may comprise a raised rim extending towards the other disc for retaining the filter between the discs. The filter may be readily adhered to the discs during the construction of the filter unit. The discs may together be considered to form at least part of a filter unit to which the filter is adhered during construction of the filter unit.
- The filter unit preferably comprises at least one seal for engaging an outer surface of the fan. This can enable the filter unit to form one or more air-tight seals with the fan to ensure that the air flow generated by the fan passes through the filter and not around the filter. Preferably, the filter unit is attachable to the casing so that the filter is located over the air inlet of the fan. In a preferred embodiment the filter unit is in the form of a sleeve which is locatable about an outer surface of a casing. Forming the filter unit in the form of a sleeve can enable the filter unit to be easily pushed or pulled over the casing of the fan as required. The filter unit may comprise a first seal for engaging the casing of the fan, and a second seal for engaging the air outlet of the fan so that an air flow is drawn through the filter unit between the seals and through the filter. The casing may be in the form of a base, which may be free-standing on a floor, desk, table or other surface.
- The filter unit may comprise an outer cover comprising a plurality of apertures through which air enters the filter unit. This outer cover can provide a first, relatively coarse filter of the filter unit to prevent airborne objects such as insects or large particles of dust from coming into contact with the filter, and can prevent the filter from being contacted by a user, particularly during the attachment of the filter unit to the fan, and so prevent damage to the filter. The outer cover is preferably transparent to allow a user to see the amount of dust or debris which has been captured by the filter.
- The casing may comprise a base surface and a side wall, with the air inlet being located in the side wall of the casing. The air inlet may extend at least partially about the casing, and may comprise an array of apertures. The casing may be substantially cylindrical in shape. The motor and the impeller are preferably located within the casing. A diffuser is preferably located downstream from the impeller.
- The air outlet may be detachably connected to the filter unit. Part of the filter unit may be surrounded by part of the air outlet when the filter unit is attached to the fan. For example, the air outlet may comprise a base which is located over part of the filter unit when the air outlet is connected to the filter unit.
- The casing may have a first connector, and the air outlet may have a second connector. The filter unit may include a third connector, which is substantially the same as the second connector, for co-operating with the first connector to removably connect the filter unit to the casing, and a fourth connector, which is substantially the same as the first connector, for co-operating with the second connector to removably connect the air outlet to the filter unit. This can allow the air outlet to be connected either directly to the casing, or for the filter unit to be connected between the casing and the air outlet. The type of connection made between the filter unit and the casing, and between the air outlet and the filter unit, is the same as the type of connection which is made between the air outlet and the casing in the absence of the filter unit. This facilitates the connection of the filter unit to the casing and the air outlet, as the technique for connecting the air outlet to the casing is the same as that for connecting the filter unit to the base, and for connecting the air outlet to the filter unit.
- Preferred features of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
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FIG. 1 is a front view of a fan; -
FIG. 2 is a perspective view of the base of the fan ofFIG. 1 ; -
FIG. 3 is a perspective view of the air outlet of the fan ofFIG. 1 ; -
FIG. 4 is a lower perspective view of a portion of the air outlet of the fan ofFIG. 1 ; -
FIG. 5 is a sectional view of the fan ofFIG. 1 ; -
FIG. 6 is an enlarged view of part ofFIG. 5 ; -
FIG. 7 is a side view of an accessory for attachment to the fan ofFIG. 1 ; -
FIG. 8 is a perspective view, from above, of the accessory ofFIG. 7 ; -
FIG. 9 is a sectional view of the accessory ofFIG. 7 ; -
FIG. 10 is a perspective view of the fan ofFIG. 1 with the accessory ofFIG. 7 attached thereto; and -
FIG. 11 is a sectional view of the fan ofFIG. 10 . -
FIG. 1 is a front view of afan 10. Thefan 10 is preferably in the form of abladeless fan 10 comprising abase 12 and anair outlet 14 connected to thebase 12. With reference also toFIG. 2 , thebase 12 comprises a substantially cylindricalouter casing 16 having a plurality ofair inlets 18 in the form of apertures formed in theouter casing 16 and through which a primary air flow is drawn into the base 12 from the external environment. The base 12 further comprises a plurality of user-operable buttons 20 and a user-operable dial 22 for controlling the operation of thefan 10. In this example thebase 12 has a height in the range from 200 to 300 mm, and theouter casing 16 has an external diameter in the range from 100 to 200 mm. - As shown in
FIG. 3 , theair outlet 14 has an annular shape and defines anopening 24. Theair outlet 14 has a height in the range from 200 to 400 mm. Theair outlet 14 comprises amouth 26 located towards the rear of thefan 10 for emitting air from thefan 10 and through theopening 24. Themouth 26 extends at least partially about theopening 24, and preferably surrounds theopening 24. The inner periphery of theair outlet 14 comprises aCoanda surface 28 located adjacent themouth 26 and over which themouth 26 directs the air emitted from thefan 10, adiffuser surface 30 located downstream of theCoanda surface 28 and aguide surface 32 located downstream of thediffuser surface 30. Thediffuser surface 30 is arranged to taper away from the central axis X of theopening 24 in such a way so as to assist the flow of air emitted from thefan 10. The angle subtended between thediffuser surface 30 and the central axis X of theopening 24 is in the range from 5 to 25°, and in this example is around 15°. Theguide surface 32 is arranged at an angle to thediffuser surface 30 to further assist the efficient delivery of a cooling air flow from thefan 10. Theguide surface 32 is preferably arranged substantially parallel to the central axis X of theopening 24 to present a substantially flat and substantially smooth face to the air flow emitted from themouth 26. A visually appealing taperedsurface 34 is located downstream from theguide surface 32, terminating at atip surface 36 lying substantially perpendicular to the central axis X of theopening 24. The angle subtended between thetapered surface 34 and the central axis X of theopening 24 is preferably around 45°. The overall depth of theair outlet 14 in a direction extending along the central axis X of theopening 24 is in the range from 100 to 150 mm, and in this example is around 110 mm. -
FIG. 5 illustrates a sectional view through thefan 10. Thebase 12 comprises alower base member 38, anintermediary base member 40 mounted on thelower base member 38, and anupper base member 42 mounted on theintermediary base member 40. Thelower base member 38 has a substantiallyflat bottom surface 43. Theintermediary base member 40 houses acontroller 44 for controlling the operation of thefan 10 in response to depression of the useroperable buttons 20 shown inFIGS. 1 and 2 , and/or manipulation of the useroperable dial 22. Theintermediary base member 40 may also house anoscillating mechanism 46 for oscillating theintermediary base member 40 and theupper base member 42 relative to thelower base member 38. The range of each oscillation cycle of theupper base member 42 is preferably between 60° and 120°, and in this example is around 90°. In this example, theoscillating mechanism 46 is arranged to perform around 3 to 5 oscillation cycles per minute. Amains power cable 48 extends through an aperture formed in thelower base member 38 for supplying electrical power to thefan 10. - The
upper base member 42 may be tilted relative to theintermediary base member 40 to adjust the direction in which the primary air flow is emitted from thefan 10. For example, the upper surface of theintermediary base member 40 and the lower surface of theupper base member 42 may be provided with interconnecting features which allow theupper base member 42 to move relative to theintermediary base member 40 while preventing theupper base member 42 from being lifted from theintermediary base member 40. For example, theintermediary base member 40 and theupper base member 42 may comprise interlocking L-shaped members. - The
upper base member 42 has an open upper end, and comprises an array ofapertures 50 which extend at least partially about theupper base member 42. Theapertures 50 provide theair inlet 18 of thebase 12. Theupper base member 42 houses animpeller 52 for drawing the primary air flow through theapertures 50 and into thebase 12. Preferably, theimpeller 52 is in the form of a mixed flow impeller. Theimpeller 52 is connected to arotary shaft 54 extending outwardly from amotor 56. In this example, themotor 56 is a DC brushless motor having a speed which is variable by thecontroller 44 in response to user manipulation of thedial 22. The maximum speed of themotor 56 is preferably in the range from 5,000 to 10,000 rpm. Themotor 56 is housed within a motor bucket comprising anupper portion 58 connected to alower portion 60. The motor bucket is retained within theupper base member 42 by amotor bucket retainer 62. The upper end of theupper base member 42 comprises a cylindricalouter surface 64. Themotor bucket retainer 62 is connected to the open upper end of theupper base member 42, for example by a snap-fit connection. Themotor 56 and its motor bucket are not rigidly connected to themotor bucket retainer 62, allowing some movement of themotor 56 within theupper base member 42. - Returning to
FIG. 2 , the upper end of theupper base member 42 comprises two pairs ofopen grooves 66 formed by removing part of theouter surface 64 to leave a shaped ‘cutaway’ portion. The upper end of each of thegrooves 66 is in open communication with the open upper end of theupper base member 42. Theopen groove 66 is arranged to extend downwardly from the open upper end of theupper base member 42. A lower part of thegroove 66 comprises acircumferentially extending track 68 having upper and lower portions bounded by theouter surface 64 of theupper base member 42. Each pair ofopen grooves 66 is located symmetrically about the upper end of theupper base member 42, the pairs being spaced circumferentially from each other. An annular sealingmember 69 extends about the outer surface of theupper base member 42, and is located beneath thetracks 68 of thegrooves 66. - The cylindrical
outer surface 64 of the upper end of theupper base member 42 further comprises a pair ofwedge members 70 having atapered part 72 and aside wall 74. Thewedge members 70 are located on opposite sides of theupper base member 42, with eachwedge member 70 being located within a respective cutaway portion of theouter surface 64. - The
motor bucket retainer 62 comprisescurved vane portions motor bucket retainer 62. Eachcurved vane upper portion 58 of the motor bucket. Thus themotor bucket retainer 62 and thecurved vanes motor bucket retainer 62 prevents the motor bucket from becoming dislodged and falling towards theair outlet 14 if thefan 10 becomes inverted. - With reference again to
FIG. 5 , one of theupper portion 58 and thelower portion 60 of the motor bucket comprises adiffuser 80 in the form of a stationary disc havingspiral fins 82, and which is located downstream from theimpeller 52. One of thespiral fins 82 has a substantially inverted U-shaped cross-section when sectioned along a line passing vertically through theupper base member 42. Thisspiral fin 82 is shaped to enable a power connection cable to pass through thespiral fin 82 to themotor 56. - The motor bucket is located within, and mounted on, an
impeller housing 84. Theimpeller housing 84 is, in turn, mounted on a plurality of angularly spaced supports 86, in this example three supports, located within theupper base member 42 of thebase 12. A generally frusto-conical shroud 88 is located within theimpeller housing 84. Theshroud 88 is preferably connected to the outer edges of theimpeller 52, and is shaped so that the outer surface of theshroud 88 is in close proximity to, but does not contact, the inner surface of theimpeller housing 84. A substantiallyannular inlet member 90 is connected to the bottom of theimpeller housing 84 for guiding the primary air flow into theimpeller housing 84. The top of theimpeller housing 84 comprises a substantiallyannular air outlet 92 for guiding air flow emitted from theimpeller housing 84 towards theair outlet 14. - Preferably, the base 12 further comprises silencing members for reducing noise emissions from the
base 12. In this example, theupper base member 42 of thebase 12 comprises a disc-shapedfoam member 94 located towards the base of theupper base member 42, and a substantiallyannular foam member 96 located within theimpeller housing 84. - A flexible sealing member is mounted on the
impeller housing 84. The flexible sealing member inhibits the return of air to theair inlet member 90 along a path extending between theouter casing 16 and theimpeller housing 84 by separating the primary air flow drawn in from the external environment from the air flow emitted from theair outlet 92 of theimpeller 52 and thediffuser 80. The sealing member preferably comprises alip seal 98. The sealing member is annular in shape and surrounds theimpeller housing 84, extending outwardly from theimpeller housing 84 towards theouter casing 16. In the illustrated embodiment the diameter of the sealing member is greater than the radial distance from theimpeller housing 84 to theouter casing 16. Thus theouter portion 100 of the sealing member is biased against theouter casing 16 and caused to extend along the inner face of theouter casing 16, forming a seal. Thelip seal 98 of the preferred embodiment tapers and narrows to atip 102 as it extends away from theimpeller housing 84 and towards theouter casing 16. Thelip seal 98 is preferably formed from rubber. - The sealing member further comprises a
guide portion 104 for guiding apower connection cable 106 to themotor 56. Theguide portion 104 of the illustrated embodiment is formed in the shape of a collar and may be a grommet. Theelectrical cable 106 is in the form of a ribbon cable attached to the motor at joint 108. Theelectrical cable 106 extending from themotor 56 passes out of thelower portion 60 of the motor bucket throughspiral fin 82. The passage of theelectrical cable 106 follows the shaping of theimpeller housing 84 and theguide portion 104 is shaped to enable theelectrical cable 106 to pass through the flexible sealing member. Theguide portion 104 of the sealing member enables theelectrical cable 106 to be clamped and held within theupper base member 42. Acuff 110 accommodates theelectrical cable 106 within the lower portion of theupper base member 42. -
FIG. 6 illustrates a sectional view through theair outlet 14. Theair outlet 14 comprises an annularouter casing section 120 connected to and extending about an annularinner casing section 122. Each of these sections may be formed from a plurality of connected parts, but in this embodiment each of theouter casing section 120 and theinner casing section 122 is formed from a respective, single molded part. Theinner casing section 122 defines thecentral opening 24 of theair outlet 14, and has an externalperipheral surface 124 which is shaped to define theCoanda surface 28,diffuser surface 30,guide surface 32 and taperedsurface 34. - The
outer casing section 120 and theinner casing section 122 together define an annularinterior passage 126 of theair outlet 14. Thus, theinterior passage 126 extends about theopening 24. Theinterior passage 126 is bounded by the internalperipheral surface 128 of theouter casing section 120 and the internalperipheral surface 130 of theinner casing section 122. As shown inFIG. 4 , theouter casing section 120 comprises a base 132 having aninner surface 134. Formed on theinner surface 134 of the base 132 are two pairs oflugs 136 and a pair oframps 138 for connection to the upper end of theupper base member 42. Eachlug 136 and eachramp 138 upstands from theinner surface 134. Thus thebase 132 is connected to, and over, the open upper end of themotor bucket retainer 62 and theupper base member 42 of thebase 12. The pairs oflugs 136 are located around theouter casing section 120 and spaced from each other so that the pairs oflugs 136 correspond to the spaced arrangement of the pairs ofopen grooves 66 of the upper end of theupper base member 42 and so that the location of the pair oframps 138 corresponds to the location of the pair ofwedge members 70 of the upper end of theupper base member 42. - The
base 132 of theouter casing section 120 comprises an aperture through which the primary air flow enters theinterior passage 126 of theair outlet 14 from the upper end of theupper base member 42 and the open upper end of themotor bucket retainer 62. - The
mouth 26 of theair outlet 14 is located towards the rear of thefan 10. Themouth 26 is defined by overlapping, or facing,portions peripheral surface 128 of theouter casing section 120 and the externalperipheral surface 124 of theinner casing section 122, respectively. In this example, themouth 26 is substantially annular and, as illustrated inFIG. 4 , has a substantially U-shaped cross-section when sectioned along a line passing diametrically through theair outlet 14. In this example, the overlappingportions peripheral surface 128 of theouter casing section 120 and the externalperipheral surface 124 of theinner casing section 122 are shaped so that themouth 26 tapers towards anoutlet 144 arranged to direct the primary flow over theCoanda surface 28. Theoutlet 144 is in the form of an annular slot, preferably having a relatively constant width in the range from 0.5 to 5 mm. In this example theoutlet 144 has a width of around 1 mm. Spacers may be spaced about themouth 26 for urging apart the overlappingportions peripheral surface 128 of theouter casing section 120 and the externalperipheral surface 124 of theinner casing section 122 to maintain the width of theoutlet 144 at the desired level. These spacers may be integral with either the internalperipheral surface 128 of theouter casing section 120 or the externalperipheral surface 124 of theinner casing section 122. - Referring to
FIGS. 3 and 4 , to attach theair outlet 14 to thebase 12, theair outlet 14 is inverted from the orientation illustrated inFIG. 4 and thebase 132 of theair outlet 14 is located over the open upper end of theupper base member 42. Theair outlet 14 is aligned relative to the base 12 so that thelugs 136 of thebase 132 of theair outlet 14 are located directly in line with the open upper ends of theopen grooves 66 of theupper base member 42. In this position the pair oframps 138 of thebase 132 is directly in line with the pair ofwedge members 70 of theupper base member 42. Theair outlet 14 is then pushed on to the base 12 so that thelugs 136 are located at the base of theopen grooves 66. The sealingmember 69 of thebase 12 engages theinner surface 134 of thebase 132 of theair outlet 14 to form an air-tight seal between the base 12 and theair outlet 14. - To secure the
air outlet 14 to thebase 12, theair outlet 14 is rotated in a clockwise direction relative to the base 12 so that thelugs 136 move along thecircumferentially extending tracks 68 of theopen grooves 66. The rotation of theair outlet 14 relative to the base 12 also forces theramps 138 to run up and slide over thetapers 72 of thewedge member 70 through localized elastic deformation of the open upper end of theupper base member 42. With continued rotation of theair outlet 14 relative to thebase 12, theramps 138 are forced over theside walls 74 of thewedge members 70. The open upper end of theupper base member 42 relaxes so that theramps 138 are generally radially aligned with thewedge members 70. Consequently, theside walls 74 of thewedge members 70 prevent accidental rotation of theair outlet 14 relative to thebase 12, whereas the location thelugs 136 within thetracks 68 prevents lifting of theair outlet 14 away from thebase 12. The rotation of theair outlet 14 relative to thebase 12 does not require excessive rotational force and so the assembly of thefan 10 may be carried out by a user. - To operate the
fan 10 the user depresses an appropriate one of thebuttons 20 on thebase 12, in response to which thecontroller 44 activates themotor 56 to rotate theimpeller 52. The rotation of theimpeller 52 causes a primary air flow to be drawn into the base 12 through theair inlet 18. Depending on the speed of themotor 56, the primary air flow generated by theimpeller 52 may be between 20 and 30 litres per second. The pressure of the primary air flow at theoutlet 92 of the base 12 may be at least 150 Pa, and is preferably in the range from 250 to 1.5 kPa. The primary air flow passes sequentially through theimpeller housing 84, the upper end of theupper base member 42 and open upper end of themotor bucket retainer 62 to enter theinterior passage 126 of theair outlet 14. The primary air flow emitted from theair outlet 92 of thebase 12 is generally in an upward and forward direction. - Within the
air outlet 14, the primary air flow is divided into two air streams which pass in opposite directions around thecentral opening 24 of theair outlet 14. Part of the primary air flow entering theair outlet 14 in a sideways direction (generally orthogonal to the axis X) passes into theinterior passage 126 in a sideways direction without significant guidance, whereas another part of the primary air flow entering theair outlet 14 in a direction parallel to the axis X is guided by thecurved vanes motor bucket retainer 62 to enable the air flow to pass into theinterior passage 126 in a sideways direction. As the air streams pass through theinterior passage 126, air enters themouth 26 of theair outlet 14. The air flow into themouth 26 is preferably substantially even about theopening 24 of theair outlet 14. Within each section of themouth 26, the flow direction of the portion of the air stream is substantially reversed. The portion of the air stream is constricted by the tapering section of themouth 26 and emitted through theoutlet 98. - The primary air flow emitted from the
mouth 26 is directed over theCoanda surface 28 of theair outlet 14, causing a secondary air flow to be generated by the entrainment of air from the external environment, specifically from the region around theoutlet 98 of themouth 26 and from around the rear of theair outlet 14. This secondary air flow passes through thecentral opening 24 of theair outlet 14, where it combines with the primary air flow to produce a total air flow, or air current, projected forward from theair outlet 14. Depending on the speed of themotor 56, the mass flow rate of the air current projected forward from thefan 10 may be in the range from 300 to 400 litres per second, and the maximum speed of the air current may be in the range from 2.5 to 4 m/s. - The even distribution of the primary air flow along the
mouth 26 of theair outlet 14 ensures that the air flow passes evenly over thediffuser surface 30. Thediffuser surface 30 causes the mean speed of the air flow to be reduced by moving the air flow through a region of controlled expansion. The relatively shallow angle of thediffuser surface 30 to the axis X of theopening 24 allows the expansion of the air flow to occur gradually. A harsh or rapid divergence would otherwise cause the air flow to become disrupted, generating vortices in the expansion region. Such vortices can lead to an increase in turbulence and associated noise in the air flow which can be undesirable, particularly in a domestic product such as a fan. The air flow projected forwards beyond thediffuser surface 30 can tend to continue to diverge. Theguide surface 32 extending inwardly towards the axis X converges the air flow towards the axis X. As a result, the air flow can travel efficiently out from theair outlet 14, enabling rapid air flow to be experienced at a distance of several meters from thefan 10. -
FIGS. 7 to 9 illustrate an external accessory for thefan 10. The accessory is in the form of afilter unit 200 which is detachably attachable to thefan 10 to allow thefilter unit 200 to be removed for cleaning or replacement. - The
filter unit 200 is in the form of a generally cylindrical sleeve which is locatable around theupper base member 42 of the base 12 so that thefilter unit 200 is located over theair inlet 18 of thefan 10, as illustrated inFIGS. 10 and 11 . This allows thefilter unit 200 to remove airborne particles from the primary air flow generated by thefan 10 before the primary air flow enters thebase 12 of thefan 10. - The
filter unit 200 comprises a generallyannular filter 202 for removing airborne particles from the primary air flow. Thefilter 202 is preferably in the form of a radially pleated high energy particle arrester (HEPA) filter. Thefilter 202 has a surface area that is exposed to the incoming primary air flow generated by the fan which is in the range from 0.5 to 1.5 m2, and in this example is around 1.1 m2. Thefilter 202 is surrounded by a cylindricalouter cover 204, which is preferably formed from plastics material, to protect thefilter 202 and thus allows a user to handle thefilter unit 200 without contacting thefilter 202. Thecover 204 is preferably transparent to allow a user to examine visually the state of thefilter 202 during use or after a period of use. Thecover 204 comprises a plurality of apertures (not shown) through which the primary air flow enters thefilter unit 200, and thus provides a relatively coarse first stage of filtration of thefilter unit 200 to prevent relatively large airborne objects or insects from entering thefilter unit 200. Thefilter unit 200 may further comprise additional filter media between thefilter 202 and thecover 204, or downstream from thefilter 202. For example, this additional filter media may comprise one or more of foam, carbon, paper, or fabric. - The
filter 202 and thecover 204 are sandwiched between twoannular plates filter unit 200. Eachplate inner rim 210 and a circularouter rim 212 which both extend partially towards theother plate filter 202 and thecover 204 are located between therims plates plates - The
upper plate 206 comprises alower collar 214 which is located radially inwardly from theinner rim 210 of theupper plate 206. Thelower collar 214 extends axially downwards from theupper plate 206. The inner diameter of thelower collar 214 is substantially the same as the inner diameter of thebase 132 of theair outlet 14 of thefan 10. Similar to thebase 132 of theair outlet 14, the inner surface of thelower collar 214 comprises two pairs oflugs 216 and a pair of ramps (not shown) for connection to the upper end of theupper base member 42 of thebase 12 of thefan 10. The shape of thelugs 216 and the ramps of thelower collar 214, and the angular spacing between thelugs 216 and the ramps of thelower collar 214, are substantially identical to those of thelugs 136 andramps 138 of thebase 132 of theair outlet 14. - The
upper plate 206 further comprises anupper collar 218 which is located radially inwardly from thelower collar 214. Theupper collar 218 extends axially upwards from the inner circumferential periphery of theupper plate 208. The outer diameter of theupper collar 218 is substantially the same as the outer diameter of theouter surface 64 of the open upper end of theupper base member 42. Similar to theupper base member 42, theupper collar 218 comprises two pairs ofopen grooves 220 and a pair ofwedge members 222. Theopen grooves 220 are substantially identical to theopen grooves 66 of theouter surface 64 of theupper base member 42, and the spacing between theopen grooves 220 is substantially the same as that between theopen grooves 66. Thewedge members 222 are substantially identical to thewedge members 70 of theouter surface 64 of theupper base member 42, and the spacing between thewedge members 222 is substantially the same as that between thewedge members 70. A firstannular sealing member 224 of thefilter unit 200 extends about the outer surface of theupper collar 218, and is located beneath thecircumferentially extending tracks 226 of thegrooves 220. - The
collars upper plate 206, which is preferably formed from plastics material. - The
lower plate 208 includes a relativelysmall collar 228 which extends axially downwardly from theinner rim 210 of thelower plate 208. Thecollar 228 comprises a circumferentially extending groove located on its inner surface. A secondannular sealing member 230 of thefilter unit 200 is located within this groove. Thecollar 228 is preferably integral with thelower plate 208, which is also preferably formed from a plastics material. - To attach the
filter unit 200 to thefan 10, first theair outlet 14 is detached from thebase 12. To detach theair outlet 14 from thebase 12, theair outlet 14 is twisted relative to the base 12 in the opposite direction (anti-clockwise) to that for attaching theair outlet 14 to thebase 12. With a suitable torque applied manually by the user, the upper end of theupper base member 42 is again caused to flex locally radially inwardly. This localized deformation of theupper base member 42 allows theramp 138 to be rotated over thewedge members 70, while thelugs 136 are moved simultaneously along thetracks 68 of thegrooves 66. Once thelugs 136 reach the ends of thetracks 68, theair outlet 14 may be lifted from thebase 12. - Although the detachment of the
air outlet 14 from thebase 12 requires a greater force to be applied to theair outlet 14 than the force required for attachment, the resilience of theupper base member 42 is selected so that the detachment of theair outlet 14 may be performed manually - The user then attaches the
filter unit 200 to thebase 12. The technique for attaching thefilter unit 200 to thebase 12 is essentially the same as that for attaching theair outlet 14 to thebase 12. The user locates the open lower end of thecollar 228 of thelower plate 208 over the open upper end of theupper base member 42, and lowers thefilter unit 200 around thebase 12. When the bottom end of thelower collar 214 of theupper plate 206 is located immediately above the open upper end of theupper base member 42, the user rotates thefilter unit 200 until thelugs 216 of thefilter unit 200 are located directly in line with the open upper end of theopen grooves 66 of theupper base member 42. In this position the pair of ramps of the filter unit is directly in line with the pair ofwedge members 70 of theupper base member 42. Thefilter unit 200 is then pushed further on to the base 12 so that thelugs 216 of thefilter unit 200 are located at the base of theopen grooves 66 of thebase 12. To secure thefilter unit 200 to thebase 12, thefilter unit 200 is rotated in a clockwise direction relative to the base 12 so that thelugs 216 move along thecircumferentially extending tracks 68 of theopen grooves 66. The rotation of thefilter unit 200 relative to the base 12 also forces the ramps to run up and slide over thetapers 72 of thewedge members 70 through localized elastic deformation of theupper base member 42. With continued rotation of thefilter unit 200 relative to thebase 12, the ramps are forced over theside walls 74 of thewedge members 70. Theupper base member 42 relaxes so that the ramps are generally radially aligned with thewedge members 70. Consequently, theside walls 74 of thewedge members 70 prevent accidental rotation of thefilter unit 200 relative to thebase 12, whereas the location thelugs 216 within thetracks 68 prevents lifting of thefilter unit 200 away from thebase 12. - As shown in
FIG. 11 , when thefilter unit 200 is attached to the base 12 thesecond sealing member 230 of thefilter unit 200 is located beneath theair inlet 18 of thebase 12, and engages the outer surface of the base 12 to form an air-tight seal between the base 12 and thefilter unit 200. As also shown inFIG. 10 , thebuttons 22 and useroperable dial 22 of the base 12 remain accessible by the user when thefilter unit 200 is attached to thebase 12. - The
air outlet 14 is then attached to thefilter unit 200. The attachment of theair outlet 14 to thefilter unit 200 is essentially the same as the attachment of theair outlet 14 to thebase 12. Thebase 132 of theair outlet 14 is located over theupper collar 218 of thefilter unit 200, and theair outlet 14 is aligned relative to the base 12 so that thelugs 136 of thebase 132 of theair outlet 14 are located directly in line with the open upper end of theopen grooves 220 of thefilter unit 200. Theair outlet 14 is then pushed on to thefilter unit 200 so that thelugs 136 are located at the base of theopen grooves 220. Thefirst sealing member 224 of thefilter unit 200 engages theinner surface 134 of thebase 132 of theair outlet 14 to form an air-tight seal between thefilter unit 200 and theair outlet 14. Again, to secure theair outlet 14 to thefilter unit 200 theair outlet 14 is rotated in a clockwise direction relative to thefilter unit 200 so that thelugs 136 move along thecircumferentially extending tracks 226 of theopen grooves 220 of thefilter unit 200. The rotation of theair outlet 14 relative to thefilter unit 200 also forces theramps 138 to run up and slide over the tapers of thewedge members 222 of thefilter unit 200 through localized elastic deformation of theupper collar 218. With continued rotation of theair outlet 14 relative to thefilter unit 200, theramps 138 are forced over the side walls of thewedge members 220. Theupper collar 218 relaxes so that theramps 138 are generally radially aligned with thewedge members 220. Consequently, the side walls of thewedge members 200 prevent accidental rotation of theair outlet 14 relative to thefilter unit 200, whereas the location thelugs 136 within thetracks 226 of thegrooves 200 prevents lifting of theair outlet 14 away from thefilter unit 200. - The assembled combination of the
fan 10 and thefilter unit 200 is shown inFIGS. 10 and 11 . The air-tight seals that thefilter unit 200 makes with thebase 12 and theair outlet 14 force the primary air flow to pass through thefilter 202 of thefilter unit 200 to remove airborne particulates from the primary air flow before it enters thebase 12. In addition to purifying the air in the local environment of thefan 10, the removal of airborne particulates from the primary air flow before it enters the base 12 can significantly reduce the rate at which dust and debris can build-up on the internal components of thefan 10, thereby reducing the frequency at which thefan 10 needs to be cleaned. Thefilter unit 200 may be easily replaced for cleaning or replacement by detaching theair outlet 14 from thefilter unit 200, which is performed in the same manner as the removal of theair outlet 14 from thebase 12, and subsequently detaching thefilter unit 200 from thebase 12. This can be performed quickly and easily without the use of any tools. When the use of thefilter unit 200 is no longer required, thefilter unit 200 can be rapidly removed from thefan 10 by detaching thefilter unit 200 from thebase 12, and re-attaching theair outlet 14 directly to thebase 12.
Claims (16)
1. A portable fan comprising:
a casing having an air inlet;
an air outlet comprising an interior passage for receiving an air flow, and a mouth for emitting the air flow, the interior passage extending about an opening through which air is drawn by the air flow emitted from the mouth;
an impeller and a motor for rotating the impeller to generate an air flow between the air inlet and an air outlet which has a static pressure of at least 150 Pa downstream from the impeller; and
a filter unit detachably connected to the casing, the filter unit comprising a filter located upstream of the air inlet.
2. The fan of claim 1 , wherein the motor and the impeller are arranged to generate an air flow having a static pressure in the range from 250 to 1.5 kPa.
3. The fan of claim 1 , wherein the filter unit comprises at least one seal for engaging an outer surface of the casing.
4. The fan of claim 1 , wherein the filter unit is in the form of a sleeve locatable about the casing.
5. The fan of claim 1 , wherein the filter is substantially annular in shape.
6. The fan of claim 5 , wherein the filter unit comprises two annular discs between which the filter is located.
7. The fan of claim 6 , wherein each disc comprises a raised rim extending towards the other disc for retaining the filter between the discs.
8. The fan of claim 6 , wherein the filter is adhered to the discs.
9. The fan of claim 1 , wherein the filter unit comprises a filter housing, and the filter is adhered to the filter housing.
10. The fan of claim 1 , wherein the filter unit comprises an outer cover comprising a plurality of apertures.
11. The fan of claim 1 , wherein the casing comprises a base surface and a side wall, and wherein the air inlet is located in the side wall of the casing.
12. The fan of claim 1 , wherein the air inlet extends at least partially about the casing.
13. The fan of claim 1 , wherein the air inlet comprises an array of apertures.
14. The fan of claim 1 , wherein the casing is substantially cylindrical in shape.
15. The fan of claim 1 , wherein the air outlet is detachably connected to the filter unit.
16. The fan of claim 1 , wherein the filter unit comprises a first seal for engaging the casing, and a second seal for engaging the air outlet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB1004813.0 | 2010-03-23 | ||
GB1004813.0A GB2478926B (en) | 2010-03-23 | 2010-03-23 | Portable Fan Assembly with Detachable Filter Unit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110236228A1 true US20110236228A1 (en) | 2011-09-29 |
Family
ID=42228162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/052,830 Abandoned US20110236228A1 (en) | 2010-03-23 | 2011-03-21 | Fan |
Country Status (5)
Country | Link |
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US (1) | US20110236228A1 (en) |
JP (1) | JP5318138B2 (en) |
CN (1) | CN102200147B (en) |
GB (1) | GB2478926B (en) |
WO (1) | WO2011117598A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
GB201004813D0 (en) | 2010-05-05 |
GB2478926B (en) | 2016-09-28 |
JP2011196382A (en) | 2011-10-06 |
JP5318138B2 (en) | 2013-10-16 |
CN102200147A (en) | 2011-09-28 |
WO2011117598A1 (en) | 2011-09-29 |
CN102200147B (en) | 2015-08-26 |
GB2478926A (en) | 2011-09-28 |
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Legal Events
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Owner name: DYSON TECHNOLOGY LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FITTON, NICHOLAS GERALD;SIMMONDS, KEVIN JOHN;REEL/FRAME:026266/0077 Effective date: 20110504 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |