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GB2197802A - Filter - Google Patents
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GB2197802A - Filter - Google Patents

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Publication number
GB2197802A
GB2197802A GB08628263A GB8628263A GB2197802A GB 2197802 A GB2197802 A GB 2197802A GB 08628263 A GB08628263 A GB 08628263A GB 8628263 A GB8628263 A GB 8628263A GB 2197802 A GB2197802 A GB 2197802A
Authority
GB
United Kingdom
Prior art keywords
filter
air filter
medium
air
diffusing
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.)
Withdrawn
Application number
GB08628263A
Other versions
GB8628263D0 (en
Inventor
Brian Reed
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOCKER AIR MAZE Ltd
Original Assignee
LOCKER AIR MAZE Ltd
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 LOCKER AIR MAZE Ltd filed Critical LOCKER AIR MAZE Ltd
Priority to GB08628263A priority Critical patent/GB2197802A/en
Publication of GB8628263D0 publication Critical patent/GB8628263D0/en
Publication of GB2197802A publication Critical patent/GB2197802A/en
Withdrawn legal-status Critical Current

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
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1669—Cellular material
    • B01D39/1676—Cellular material of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/024—Air cleaners using filters, e.g. moistened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/60—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the intake of internal combustion engines or turbines

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

An air filter for internal combustion engines has an annular layer of polyurethane foam 20 enclosing a conventional annular pleated paper filter medium (16) to diffuse the incoming air and act as a pre-filter before it reaches the fitter medium (16) thereby allowing a more even air flow through the filter medium (16) and increasing the life of the fitter. The layer (20) may be bonded to the end caps (10, 12) or removable for washing. <IMAGE>

Description

DESCRIPTION "FILTER" The present invention relates to air filters, and in particular, but not exclusively, to air filters for internal combustion engines.
One design of air filter for use in an internal combustion engine comprises, two flat, spaced apart annuli between which is secured a pleated strip of paper formed into a ring. The paper may either by fixedly secured to the annuli, in which case the whole filter is replaceable, or may be removably secured thereto, in which case only the paper element is replaceable.
It is important that the filter should be clean, in order to protect the engine, and it is usually necessary to replace the filter, or the paper element, as appropriate, every 12,000 miles (19,200km). It would obviously be financially beneficial if a filter with a longer life could be developed.
Also, air filters offer a resistance to the flow of air into the engine, resulting in loss of performance from the engine. Although an air filter is necessary, it would be advantageous if the air filter offered less resistance to the flow of air, thus resulting in improved engine performance and/or a saving in fuel.
In accordance with a first aspect of the present invention, an air filter comprises an air inlet and an air outlet, a filter medium positioned between the inlet and the outlet, and a diffusing medium positioned between the inlet and the filter medium.
It has been found that this results in a filter having a longer life as compared with a filter without a diffusing material.
In one embodiment, the filter medium comprises a paper-type filter, and the diffusing medium comprises an expanded foam material, e.g. expanded inter-cellular polyurethane foam.
The filter medium and/or the diffusing medium may be fixedly, or releasably, secured in the air filter.
In accordance with a second aspect of the present invention, an air filter comprises two, generally flat, spaced-apart annuli, an annular paper-type filter medium positioned between the two spaced-apart annuli and an annular diffusing layer positioned radially outwardly of the filter medium.
In one embodiment, the diffusing layer and the filter medium are bonded coaxially to the annuli, to ensure that air passing through the filter passes through the diffusing layer and the filter medium.
The paper-type element is preferably pleated, or concertinaed, as in conventional air filters. The diffusing layer may comprise a foam, for example intercellular polyurethane foam.
By way of example only, a specific embodiment of the present invention will now be described, with reference to the accompanying drawings, in which: Fig, 1 is a perspective view of one embodiment of an air filter in accordance with the present invention; and Fig. 2 is a cross-section through a portion of the air filter of Fig. 1.
The air filter illustrated comprises first and second, spaced-apart, flat plastics annuli 10,12. A cylindrically-shaped metal gauze 14 is bonded between the annuli 10,12 between their radially innermost edges, either by means of adhesive or by setting the gauze into the annuli during moulding of the annuli.
Also bonded between the annuli, radially outwardly from the gauze 14, is a conventional pleated or concertinaed paper-type filter element 16, arranged into a ring. The filter element 16 is made of resintreated fibrous paper and is pleated or concertinaed to offer a large surface area to the air passing through it. The filter element 16 is bonded during assembly to the two annuli 10,12, so that any air passing through the filter is forced to pass through the filter element 16.
A further cylindrically-shaped metal gauze 18 is bonded between the annuli, radially outwardly of the filter element 16. A length of expanded intercellular polyurethane foam 20 is wrapped around the gauze 18 into a cylindrical shape, and is sealed between the annuli 10,12, like the filter element, to ensure that any air passing through the filter passes through the foam 20. The free ends of the length of foam 20 are glued or heat sealed together at join 22.
The air filter of the present invention may be used in an identical matter to a conventional air filter, that is, it is secured in a conventional air filter holder. The engine extracts air through the centre of the filter, and air is therefore forced to pass firstly through the polyurethane foam 20 and secondly through the conventional paper filter element 16. The foam 20 filters the air and tends to trap coarse particles of solids which are present in the air, thereby allowing the paper filter element 16 to trap finer particles of solids only. This allows the paper filter element 16 to filter air for a longer time before it needs replacing, since the larger particles, which might otherwise clog the paper filter are removed by the foam 20.
The foam layer 20 also tends to diffuse the air before it reaches the paper filter element 16, thereby allowing the air to pass more evenly through the paper filter element 16, further increasing the useful life of the filter. It has also been found that the provision of a foam layer 20 results in a smaller pressure loss, thereby increasing the engine performance and saving fuel.
The invention is not restricted to the details of the foregoing embodiment. For example, although the paper filter medium 16 and the foam 20 are described as being bonded to the annuli 10,12, they may be releasably securable to the annuli, such that replacement of only the element 16 and/or the foam 20 would be necessary. Indeed, replacement of the foam 20 may not be necessary, since this can be washed, dried and replaced if desired. Also, although the embodiment includes two cylindrically shaped gauze members, 14,18, either or both of the gauze members may be dispensed with, if desired.

Claims (16)

1. An air filter comprising an air inlet and an air outlet, a filter medium positioned between the inlet and the outlet, and a diffusing medium positioned between the inlet and the filter medium.
2. An air filter as claimed in claim 1, wherein the diffusing medium comprises a reticulate material.
3. An air filter as claimed in claim 2, wherein the reticulate material comprises an expanded foam material.
4. An air filter as claimed in claim 3, wherein the expanded foam material comprises expanded intercellular polyurethane foam.
5. An air filter as claimed in claims 1 to 4, wherein the diffusing medium is fixedly secured to the air filter.
6. An air filter as claimed in claims 1 to 4, wherein the diffusing medium is releasably secured to the air filter.
7. An air filter as claimed in any of the preceding claims, comprising two generally flat spaced-apart annuli, an annular paper-type filter medium positioned between said spaced-apart annuli and an annular diffusing layer positioned radially outwardly of the filter medium.
8. An air filter as claimed in claim 7, wherein the diffusing layer and filter medium are bonded coaxially to the annuli.
9. An air filter as claimed in any of the preceding claims, further comprising a supporting structure.
10. An air filter as claimed in claim 9, wherein the supporting structure comprises a metal gauze.
11. An air filter as claimed in any of the preceding claims, wherein the filter medium comprises a paper filter.
12. An air filter as claimed in claim 11, wherein the filter medium comprises resin treated fibrous paper.
13. An air filter as claimed in claim 11 or claim 12, wherein said paper is pleated or concertinaed to increase its surface area.
14. An air filter as claimed in any of the preceding claims, wherein the free ends of the diffusing medium are heat sealed together.
15. An air filter as claimed in any of claims 1 to 13, wherein the free ends of the diffusing medium are glued together.
16. An air filter substantially as hereinbefore described with reference to, and illustrated in, the accompanying drawings.
GB08628263A 1986-11-26 1986-11-26 Filter Withdrawn GB2197802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08628263A GB2197802A (en) 1986-11-26 1986-11-26 Filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08628263A GB2197802A (en) 1986-11-26 1986-11-26 Filter

Publications (2)

Publication Number Publication Date
GB8628263D0 GB8628263D0 (en) 1986-12-31
GB2197802A true GB2197802A (en) 1988-06-02

Family

ID=10607969

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08628263A Withdrawn GB2197802A (en) 1986-11-26 1986-11-26 Filter

Country Status (1)

Country Link
GB (1) GB2197802A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599336A1 (en) * 1992-11-26 1994-06-01 FILTERWERK MANN &amp; HUMMEL GMBH Filter
WO1995005234A1 (en) * 1993-08-16 1995-02-23 Donaldson Company, Inc. Mist collector cartridge
EP0676229A1 (en) * 1994-04-11 1995-10-11 TECNOCAR S.r.l. Air filter with polyurethane support, particularly for motor vehicle passenger compartment
EP0714688A1 (en) * 1994-11-30 1996-06-05 Air-Maze Corporation Filter with molded end cap and media spacer
EP0754850A1 (en) * 1993-09-15 1997-01-22 Mario Goncalves Filter for different motors and machines
WO1999000173A1 (en) * 1997-06-26 1999-01-07 Filterwerk Mann + Hummel Gmbh Air filter
US5858044A (en) 1996-07-11 1999-01-12 Donaldson Company, Inc. Filter arrangement including removable filter with first and second media secured together
USD404807S (en) 1996-07-11 1999-01-26 Donaldson Company, Inc. Filter sleeve
USD407808S (en) 1996-07-11 1999-04-06 Donaldson Company, Inc. Filter element having circular sleeve
US6007608A (en) 1998-07-10 1999-12-28 Donaldson Company, Inc. Mist collector and method
US6159258A (en) * 1998-11-30 2000-12-12 Dana Corporation Air filter elements with foam pre-cleaners
RU2254903C1 (en) * 2004-02-16 2005-06-27 Федеральное государственное унитарное предприятие "Электростальское научно-производственное объединение "Неорганика" (ФГУП "ЭНПО "Неорганика") Self-cleaning filter for removal of oil mist from air
WO2005102496A3 (en) * 2004-04-26 2006-01-19 Induction Technology Group Ltd Filter support, especially for fluid filtration
DE102009033262A1 (en) 2009-07-14 2011-01-27 Mann + Hummel Gmbh Air cleaner i.e. rectangle air cleaner, for use in combustion machine, has foam material plate resting upon laminar part of unfiltered air-lateral and filtered-air-lateral folding edges of filter medium i.e. filter paper
CN105386903A (en) * 2015-12-08 2016-03-09 重庆翼虎动力机械有限公司 Air filter of diesel engine
CN105422330A (en) * 2015-12-08 2016-03-23 重庆翼虎动力机械有限公司 Corrosion-resistant and explosion-proof air filter
WO2022123593A1 (en) * 2020-12-09 2022-06-16 Tvs Motor Company Limited Multistage air filter assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016002246A1 (en) * 2016-02-26 2017-08-31 Mann + Hummel Gmbh Filter element, in particular for gas filtration

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB909894A (en) * 1958-12-31
GB860724A (en) * 1958-12-02 1961-02-08 Fram Corp Air filter cartridge
GB907236A (en) * 1960-03-24 1962-10-03 Fram Corp Improvements relating to air filters
US3552553A (en) * 1967-10-06 1971-01-05 Torite Enterprises Inc Dual media filtration cartridge
GB2082932A (en) * 1980-09-02 1982-03-17 Fram Corp Pleated filter element with integral shield
GB2105609A (en) * 1981-08-14 1983-03-30 Gaylord James K Supplemental air filter for internal combustion engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB860724A (en) * 1958-12-02 1961-02-08 Fram Corp Air filter cartridge
GB909894A (en) * 1958-12-31
GB907236A (en) * 1960-03-24 1962-10-03 Fram Corp Improvements relating to air filters
US3552553A (en) * 1967-10-06 1971-01-05 Torite Enterprises Inc Dual media filtration cartridge
GB2082932A (en) * 1980-09-02 1982-03-17 Fram Corp Pleated filter element with integral shield
GB2105609A (en) * 1981-08-14 1983-03-30 Gaylord James K Supplemental air filter for internal combustion engines

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599336A1 (en) * 1992-11-26 1994-06-01 FILTERWERK MANN &amp; HUMMEL GMBH Filter
EP0803276A3 (en) * 1993-08-16 1997-11-19 Donaldson Company, Inc. Mist collector cartridge
WO1995005234A1 (en) * 1993-08-16 1995-02-23 Donaldson Company, Inc. Mist collector cartridge
US5415676A (en) * 1993-08-16 1995-05-16 Donaldson Company, Inc. Mist collector cartridge
US5454858A (en) * 1993-08-16 1995-10-03 Donaldson Company, Inc. Process of using mist collector cartridge
US5935284A (en) * 1993-08-16 1999-08-10 Donaldson Company, Inc. Filter cartridge
US5871557A (en) * 1993-08-16 1999-02-16 Donaldson Company, Inc. Mist collector cartridge
AU678286B2 (en) * 1993-08-16 1997-05-22 Donaldson Company Inc. Mist collector cartridge
EP0754850A1 (en) * 1993-09-15 1997-01-22 Mario Goncalves Filter for different motors and machines
EP0676229A1 (en) * 1994-04-11 1995-10-11 TECNOCAR S.r.l. Air filter with polyurethane support, particularly for motor vehicle passenger compartment
EP0714688A1 (en) * 1994-11-30 1996-06-05 Air-Maze Corporation Filter with molded end cap and media spacer
US5891337A (en) * 1994-11-30 1999-04-06 Air-Maze Corporation Filter with molded end cap and media spacer
US6015452A (en) 1996-07-11 2000-01-18 Donaldson Company, Inc. Method of servicing an air cleaner and of filtering engine intake air using prefilter arrangements
USD407808S (en) 1996-07-11 1999-04-06 Donaldson Company, Inc. Filter element having circular sleeve
USD404807S (en) 1996-07-11 1999-01-26 Donaldson Company, Inc. Filter sleeve
US5858044A (en) 1996-07-11 1999-01-12 Donaldson Company, Inc. Filter arrangement including removable filter with first and second media secured together
WO1999000173A1 (en) * 1997-06-26 1999-01-07 Filterwerk Mann + Hummel Gmbh Air filter
US6007608A (en) 1998-07-10 1999-12-28 Donaldson Company, Inc. Mist collector and method
US6159258A (en) * 1998-11-30 2000-12-12 Dana Corporation Air filter elements with foam pre-cleaners
RU2254903C1 (en) * 2004-02-16 2005-06-27 Федеральное государственное унитарное предприятие "Электростальское научно-производственное объединение "Неорганика" (ФГУП "ЭНПО "Неорганика") Self-cleaning filter for removal of oil mist from air
WO2005102496A3 (en) * 2004-04-26 2006-01-19 Induction Technology Group Ltd Filter support, especially for fluid filtration
DE102009033262A1 (en) 2009-07-14 2011-01-27 Mann + Hummel Gmbh Air cleaner i.e. rectangle air cleaner, for use in combustion machine, has foam material plate resting upon laminar part of unfiltered air-lateral and filtered-air-lateral folding edges of filter medium i.e. filter paper
DE102009033262B4 (en) * 2009-07-14 2015-09-10 Mann + Hummel Gmbh Air filter with foam plate
CN105386903A (en) * 2015-12-08 2016-03-09 重庆翼虎动力机械有限公司 Air filter of diesel engine
CN105422330A (en) * 2015-12-08 2016-03-23 重庆翼虎动力机械有限公司 Corrosion-resistant and explosion-proof air filter
WO2022123593A1 (en) * 2020-12-09 2022-06-16 Tvs Motor Company Limited Multistage air filter assembly

Also Published As

Publication number Publication date
GB8628263D0 (en) 1986-12-31

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)