WO2006013047A1 - Filter for internal combustion engines, in particular diesel fuel fed - Google Patents

Filter for internal combustion engines, in particular diesel fuel fed Download PDF

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Publication number
WO2006013047A1
WO2006013047A1 PCT/EP2005/008140 EP2005008140W WO2006013047A1 WO 2006013047 A1 WO2006013047 A1 WO 2006013047A1 EP 2005008140 W EP2005008140 W EP 2005008140W WO 2006013047 A1 WO2006013047 A1 WO 2006013047A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
interspace
diesel fuel
casing
fuel
Prior art date
Application number
PCT/EP2005/008140
Other languages
French (fr)
Inventor
Giorgio Girondi
Original Assignee
Ufi Filters S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ufi Filters S.P.A. filed Critical Ufi Filters S.P.A.
Publication of WO2006013047A1 publication Critical patent/WO2006013047A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements

Definitions

  • the present invention relates in a general sense to a fuel filter for internal combustion engines, and in particular to a diesel fuel filter to be associated with diesel engines.
  • Diesel engine fuel is known to normally contain impurities, because of which the diesel engine feed system has to be provided with a suitable fuel filter.
  • Modern diesel fuel filters generally consist of a cup-shaped body closed by a cover and containing a coaxial filter cartridge generally of toroidal shape.
  • the cartridge and the cup-shaped body there are defined two chambers for passage of the diesel fuel to be filtered and of the filtered diesel fuel respectively, the first connected to the pump unit and the second to the injection system.
  • the chamber for passage of the diesel fuel to be filtered is normally provided by the inner region of the filter cartridge.
  • diesel fuel also generally contains waxy materials, such as paraffin, which tend to thicken at relatively low temperatures, of the order of -5 0 C, until they solidify at lower temperatures, of the order of -20/25 0 C.
  • waxy materials such as paraffin
  • the object of the present invention is to overcome this type of drawback by providing a fuel filter formed in such a manner as to delay paraffin formation.
  • the invention attains said object by virtue of the characteristics defined in the claims.
  • a diesel fuel filter comprising an outer casing the interior of which is separated by a filtering baffle into two separate chambers to which a fuel inlet conduit and a fuel outlet conduit are connected respectively, at least a portion of the surface of said casing consisting of at least two walls separated by an interspace.
  • Said interspace advantageously has a thermal insulating function so as to delay dispersion of the fuel heat towards the outside and hence maintain as long as possible the temperature of the fuel within the casing above the critical temperature which causes paraffin formation.
  • said interspace comprises at least one layer of thermally insulating material, such as neoprene.
  • the thickness of the thermally insulating layer can be between 0.5 and 10 mm, and preferably between 1 and 3 mm.
  • the insulating action of the interspace is achieved by maintaining its interior under vacuum, i.e. under conditions of air absence. In this latter case, two thermally insulating spacers are used to maintain the two walls separated.
  • the filter casing comprises a cup-shaped body upperly closed by a cover, the surfaces of at least one of these parts consisting of two walls separated by said interspace with a thermally insulating function.
  • only the surface of the cup-shaped body comprises two walls separated by an interspace, while the cover can be formed from a thermally insulating material.
  • Figure 1 is a partial axial section through a diesel fuel filter according to the invention.
  • Figure 2 is the section N-Il of Figure 1.
  • Figure 3 shows an enlargement of one of the surfaces of the filter casing.
  • Figure 4 is a section through a variant of the invention taken perpendicular to the filter axis.
  • Figure 5 shows an enlargement of one of the surfaces of the filter casing of the variant of Figure 4.
  • Figure 6 shows an enlarged detail of Figure 1.
  • the filter comprises a casing 1 consisting of a cup-shaped body 2 closed upperly by a cover 3.
  • a gasket 8 of thermally insulating material is interposed between the rim of the cup-shaped body 2 and the cover ( Figure 6), to lie mounted on the annular edge of the cup-shaped body 2.
  • other embodiments of the invention comprise means for maintaining the casing interior thermally insulated from the external environment.
  • the interior of the casing 1 houses a filtering baffle 4 which divides the interior of the casing 1 into two separate chambers 5 and 6 to which a fuel inlet conduit 7 and the fuel outlet conduit 9 are connected respectively.
  • said filtering baffle is in the form of a toroidal filter cartridge 40, however in other embodiments of the invention said baffle could have a different form.
  • the filter cartridge 40 is supported lowerly by a plurality of lugs 10 and upperly presents a stub 41 which is inserted into a mating stub 30 branching from the lower surface of the cover 3.
  • the surfaces of the cover 3 and the surfaces of the cup-shaped body 4 both present two spaced-apart walls 11 and 12 separated by an interspace 13.
  • the interspace houses a layer of thermally insulating material 14 acting as an insulant.
  • this layer of thermally insulating material is of neoprene and has a thickness of 2 mm.
  • the presence of said layer of insulating material delays heat dispersion towards the outside of the filter, hence the fuel, in this case diesel fuel, contained in the filter requires a longer time to reach the critical temperature at which paraffins begin to form.
  • Figures 4 and 5 show a variant of the first described embodiment, in which the interspace between the filter walls is maintained under vacuum.
  • a plurality of spacers 15 are inserted between the walls to maintain said walls separated from each other, and which would tend to approach each other by the effect of the vacuum.

Abstract

Diesel fuel filter, comprising an outer casing the interior of which is separated by a filtering baffle into two separate chambers to which a fuel inlet conduit and a fuel outlet conduit are connected respectively, at least a portion of the surface of said casing consisting of two walls separated by an interspace with a thermal insulating function.

Description

DESCRIPTION
FILTER FOR INTERNAL COMBUSTION ENGINES, IN PARTICULAR
DIESEL FUEL FED
TECHNICAL FIELD
The present invention relates in a general sense to a fuel filter for internal combustion engines, and in particular to a diesel fuel filter to be associated with diesel engines.
PRIOR ART
Diesel engine fuel is known to normally contain impurities, because of which the diesel engine feed system has to be provided with a suitable fuel filter.
Modern diesel fuel filters generally consist of a cup-shaped body closed by a cover and containing a coaxial filter cartridge generally of toroidal shape.
Between the cartridge and the cup-shaped body there are defined two chambers for passage of the diesel fuel to be filtered and of the filtered diesel fuel respectively, the first connected to the pump unit and the second to the injection system.
The chamber for passage of the diesel fuel to be filtered is normally provided by the inner region of the filter cartridge.
In addition to said impurities, diesel fuel also generally contains waxy materials, such as paraffin, which tend to thicken at relatively low temperatures, of the order of -50C, until they solidify at lower temperatures, of the order of -20/250C. Hence, if the engine remains inactive for a certain time at very low temperatures, said waxy materials such as paraffin separate from the diesel fuel and solidify, with consequent clogging of the filter, making it impossible to operate the engine.
DISCLOSURE OF THE INVENTION
The object of the present invention is to overcome this type of drawback by providing a fuel filter formed in such a manner as to delay paraffin formation. The invention attains said object by virtue of the characteristics defined in the claims.
Specifically the invention provides a diesel fuel filter, comprising an outer casing the interior of which is separated by a filtering baffle into two separate chambers to which a fuel inlet conduit and a fuel outlet conduit are connected respectively, at least a portion of the surface of said casing consisting of at least two walls separated by an interspace. Said interspace advantageously has a thermal insulating function so as to delay dispersion of the fuel heat towards the outside and hence maintain as long as possible the temperature of the fuel within the casing above the critical temperature which causes paraffin formation.
In a first embodiment of the invention, said interspace comprises at least one layer of thermally insulating material, such as neoprene. The thickness of the thermally insulating layer can be between 0.5 and 10 mm, and preferably between 1 and 3 mm. In a second embodiment of the invention, the insulating action of the interspace is achieved by maintaining its interior under vacuum, i.e. under conditions of air absence. In this latter case, two thermally insulating spacers are used to maintain the two walls separated. In a preferred embodiment, the filter casing comprises a cup-shaped body upperly closed by a cover, the surfaces of at least one of these parts consisting of two walls separated by said interspace with a thermally insulating function.
In more economical embodiments of the invention, only the surface of the cup-shaped body comprises two walls separated by an interspace, while the cover can be formed from a thermally insulating material.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics and the constructional merits of the invention will be more apparent from the ensuing description given with reference to the figures of the accompanying drawings which illustrate a particular preferred embodiment by way of non-limiting example.
Figure 1 is a partial axial section through a diesel fuel filter according to the invention.
Figure 2 is the section N-Il of Figure 1.
Figure 3 shows an enlargement of one of the surfaces of the filter casing. Figure 4 is a section through a variant of the invention taken perpendicular to the filter axis.
Figure 5 shows an enlargement of one of the surfaces of the filter casing of the variant of Figure 4.
Figure 6 shows an enlarged detail of Figure 1.
BEST MODE FOR CARRYING OUT THE INVENTION From said figures, and in particular Figure 1 , it can be seen that the filter comprises a casing 1 consisting of a cup-shaped body 2 closed upperly by a cover 3. A gasket 8 of thermally insulating material is interposed between the rim of the cup-shaped body 2 and the cover (Figure 6), to lie mounted on the annular edge of the cup-shaped body 2. In place of the gasket 8, other embodiments of the invention comprise means for maintaining the casing interior thermally insulated from the external environment. The interior of the casing 1 houses a filtering baffle 4 which divides the interior of the casing 1 into two separate chambers 5 and 6 to which a fuel inlet conduit 7 and the fuel outlet conduit 9 are connected respectively. In the illustrated embodiment, said filtering baffle is in the form of a toroidal filter cartridge 40, however in other embodiments of the invention said baffle could have a different form. The filter cartridge 40 is supported lowerly by a plurality of lugs 10 and upperly presents a stub 41 which is inserted into a mating stub 30 branching from the lower surface of the cover 3.
With reference to Figures 2 and 3, the surfaces of the cover 3 and the surfaces of the cup-shaped body 4 both present two spaced-apart walls 11 and 12 separated by an interspace 13. In the embodiment of Figure 2 the interspace houses a layer of thermally insulating material 14 acting as an insulant.
In the illustrated embodiment this layer of thermally insulating material is of neoprene and has a thickness of 2 mm. The presence of said layer of insulating material delays heat dispersion towards the outside of the filter, hence the fuel, in this case diesel fuel, contained in the filter requires a longer time to reach the critical temperature at which paraffins begin to form.
Figures 4 and 5 show a variant of the first described embodiment, in which the interspace between the filter walls is maintained under vacuum. In this case a plurality of spacers 15 are inserted between the walls to maintain said walls separated from each other, and which would tend to approach each other by the effect of the vacuum.

Claims

1. A diesel fuel filter, comprising an outer casing the interior of which is separated by a filtering baffle into two separate chambers to which a fuel inlet conduit and a fuel outlet conduit are connected respectively, characterised in that at least a portion of the surface of said casing consists of two walls separated by an interspace with a thermal insulating function.
2. A diesel fuel filter as claimed in claim 1 , characterised in that said casing comprises a cup-shaped body closed upperly by a cover.
3. A filter as claimed in claim 2, characterised in that said at least one portion of the surface of said casing consisting of two walls separated by an interspace is the wall of said cup-shaped body.
4. A filter as claimed in claim 2, characterised in that said at least one portion of the surface of said casing consisting of two walls separated by an interspace is the wall of said cover.
5. A filter as claimed in claim 1 , characterised in that said interspace comprises at least one layer of thermally insulating material.
6. A filter as claimed in claim 5, characterised in that the thickness of said thermally insulating material is between 0.5 and 10 mm, and preferably between 1 and 3 mm.
7. A filter as claimed in claim 1 , characterised in that the interior of said interspace is put under vacuum.
8. A filter as claimed in claim 1 , characterised in that a plurality of spacers are interposed between said walls to maintain said walls separated from each other.
9. A filter as claimed in claim 8, characterised in that said spacers are formed of thermally insulating material.
PCT/EP2005/008140 2004-08-03 2005-07-25 Filter for internal combustion engines, in particular diesel fuel fed WO2006013047A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000100A ITRE20040100A1 (en) 2004-08-03 2004-08-03 FILTER FOR ENDOTHERMAL ENGINES, IN PARTICULAR DIESEL FUEL
ITRE2004A000100 2004-08-03

Publications (1)

Publication Number Publication Date
WO2006013047A1 true WO2006013047A1 (en) 2006-02-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/008140 WO2006013047A1 (en) 2004-08-03 2005-07-25 Filter for internal combustion engines, in particular diesel fuel fed

Country Status (2)

Country Link
IT (1) ITRE20040100A1 (en)
WO (1) WO2006013047A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011089511A1 (en) 2011-12-22 2013-06-27 Mahle International Gmbh Fuel filter has filter housing with filter housing pot, cover and receiving chamber for filter element, where inner wall of filter housing is partially provided with separation layer that is formed as insert made from thermoforming film
WO2017134041A1 (en) * 2016-02-03 2017-08-10 Mahle International Gmbh Internal combustion engine system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8511519U1 (en) * 1985-04-18 1986-07-31 Lacrex Brevetti S.A., Orselina Device for preheating liquids, in particular liquid fuels
DE3540242A1 (en) * 1985-11-13 1987-05-14 Ernst Roehner Warm air-heated diesel fuel filter
DD260117A1 (en) * 1987-03-11 1988-09-14 Lacrex Brevetti Sa DEVICE FOR ATTACHING FLUIDS, IN PARTICULAR FOR PREWAIVING LIQUID COMBUSTION OR FUELS
US4866250A (en) * 1985-04-18 1989-09-12 Lacrex Brevetti Sa Device for preheating liquid, particularly liquid fuel
US5981910A (en) * 1997-05-06 1999-11-09 Williams; Wayne Heated cover for a fuel filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8511519U1 (en) * 1985-04-18 1986-07-31 Lacrex Brevetti S.A., Orselina Device for preheating liquids, in particular liquid fuels
US4866250A (en) * 1985-04-18 1989-09-12 Lacrex Brevetti Sa Device for preheating liquid, particularly liquid fuel
DE3540242A1 (en) * 1985-11-13 1987-05-14 Ernst Roehner Warm air-heated diesel fuel filter
DD260117A1 (en) * 1987-03-11 1988-09-14 Lacrex Brevetti Sa DEVICE FOR ATTACHING FLUIDS, IN PARTICULAR FOR PREWAIVING LIQUID COMBUSTION OR FUELS
US5981910A (en) * 1997-05-06 1999-11-09 Williams; Wayne Heated cover for a fuel filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011089511A1 (en) 2011-12-22 2013-06-27 Mahle International Gmbh Fuel filter has filter housing with filter housing pot, cover and receiving chamber for filter element, where inner wall of filter housing is partially provided with separation layer that is formed as insert made from thermoforming film
WO2017134041A1 (en) * 2016-02-03 2017-08-10 Mahle International Gmbh Internal combustion engine system

Also Published As

Publication number Publication date
ITRE20040100A1 (en) 2004-11-03

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