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GB2195917A - Filter element - Google Patents

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Publication number
GB2195917A
GB2195917A GB08720686A GB8720686A GB2195917A GB 2195917 A GB2195917 A GB 2195917A GB 08720686 A GB08720686 A GB 08720686A GB 8720686 A GB8720686 A GB 8720686A GB 2195917 A GB2195917 A GB 2195917A
Authority
GB
United Kingdom
Prior art keywords
pleats
filter
filters
surface area
sides
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Withdrawn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
GB08720686A
Other versions
GB8720686D0 (en
Inventor
Michael John White
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.)
British Railways Board
Original Assignee
British Railways Board
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 British Railways Board filed Critical British Railways Board
Publication of GB8720686D0 publication Critical patent/GB8720686D0/en
Publication of GB2195917A publication Critical patent/GB2195917A/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Withdrawn legal-status Critical Current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
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/016—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements with corrugated, folded or wound filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/50—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

To remove particulates a filter element comprises a sheet of porous cotton or glass fibre fabric folded into parallel pleats having the cross-section illustrated. The rounded folds enable a larger effective filtering area in a given space than the prior art V-section folds allow. <IMAGE>

Description

SPECIFICATION Filters This invention relates to filters for filtering fluids and made from sheets of flexible filtration material such as spun glass fibre or spun cotton. Such filters find application as air filters in, for example, air conditioning systems on railway coaches.
In order to provide such filters with a large surface area while at the same time containing them within a given space, it is known to form the sheet material with 'V' shaped pleats in concertina fashion. These filters have been failing prematurely because of the loading of the surface of the filters with dirt. To overcome this problem attempts have been made to increase the surface area. However, to in crease the surface area more pleats are required.
The disadvantage of this method of increasing the surface area is that the surface of the material at and adjacent the root of the 'V' is masked by an effective doubling of the thickness so that the depth of the space within the 'V' is reduced as shown in Fig. 1 of the accompanying drawings and to increase the number of pleats exacerbate this.
In order to increase the surface area of a filter and so overcome the aforesaid deficiency a filter in accordance with the invention has pleats formed with a blend radius or a linear equivalent or a combination thereof between the sides of the pleats.
Folding the material in this manner allows the full face area of the material to be utilised.
The invention will now be further described by way of example with reference to Fig. 2 of the accompanying drawing, which shows a sectional view of one construction of filter in accordance with the invention.
In contrast to the filter of Fig. 1 which has pleats of 'V' shape, the filter of Fig. 2 has pleats with parallel sides 10 interconnected by radiused portions 11 which blend into the sides 10. As an alternative to each of the portions 11 a series of short straight lengths may be used which together will form the linear equivalent of a radiused portion 11.
Calculations show that for a 2460.5 mm.
length of material folded in 'V' form and a width of 542 mm. as shown in Fig. 1 the usable area is .64m2. Whereas as shown in Fig. 2 for a 2279.5 mm. length of material of the same width folded with parallel sides and a blend radius therebetween to be contained within the same length as the filter of Fig. 1 the usable area is 1.24 m2 for a filter of the same depth.
The invention is applicable to filters for the filtration of both gases and liquids.
1. A filter for filtering fluids to remove particulate material therefrom, the filter comprising a sheet of flexible filtration material folded into pleats, concertina fashion, characterised in that the pleats are formed with a blend radius, or a linear equivalent thereof or a combination of a blend radius and linear equivalent between the sides of the pleats.
2. A filter according to claim 1, wherein the pleats have parallel sides.
3. A filter substantially as hereinbefore described with reference to Fig. 2 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Filters This invention relates to filters for filtering fluids and made from sheets of flexible filtration material such as spun glass fibre or spun cotton. Such filters find application as air filters in, for example, air conditioning systems on railway coaches. In order to provide such filters with a large surface area while at the same time containing them within a given space, it is known to form the sheet material with 'V' shaped pleats in concertina fashion. These filters have been failing prematurely because of the loading of the surface of the filters with dirt. To overcome this problem attempts have been made to increase the surface area. However, to in crease the surface area more pleats are required. The disadvantage of this method of increasing the surface area is that the surface of the material at and adjacent the root of the 'V' is masked by an effective doubling of the thickness so that the depth of the space within the 'V' is reduced as shown in Fig. 1 of the accompanying drawings and to increase the number of pleats exacerbate this. In order to increase the surface area of a filter and so overcome the aforesaid deficiency a filter in accordance with the invention has pleats formed with a blend radius or a linear equivalent or a combination thereof between the sides of the pleats. Folding the material in this manner allows the full face area of the material to be utilised. The invention will now be further described by way of example with reference to Fig. 2 of the accompanying drawing, which shows a sectional view of one construction of filter in accordance with the invention. In contrast to the filter of Fig. 1 which has pleats of 'V' shape, the filter of Fig. 2 has pleats with parallel sides 10 interconnected by radiused portions 11 which blend into the sides 10. As an alternative to each of the portions 11 a series of short straight lengths may be used which together will form the linear equivalent of a radiused portion 11. Calculations show that for a 2460.5 mm. length of material folded in 'V' form and a width of 542 mm. as shown in Fig. 1 the usable area is .64m2. Whereas as shown in Fig. 2 for a 2279.5 mm. length of material of the same width folded with parallel sides and a blend radius therebetween to be contained within the same length as the filter of Fig. 1 the usable area is 1.24 m2 for a filter of the same depth. The invention is applicable to filters for the filtration of both gases and liquids. CLAIMS
1. A filter for filtering fluids to remove particulate material therefrom, the filter comprising a sheet of flexible filtration material folded into pleats, concertina fashion, characterised in that the pleats are formed with a blend radius, or a linear equivalent thereof or a combination of a blend radius and linear equivalent between the sides of the pleats.
2. A filter according to claim 1, wherein the pleats have parallel sides.
3. A filter substantially as hereinbefore described with reference to Fig. 2 of the accompanying drawings.
GB08720686A 1986-10-06 1987-09-03 Filter element Withdrawn GB2195917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868623909A GB8623909D0 (en) 1986-10-06 1986-10-06 Air filters

Publications (2)

Publication Number Publication Date
GB8720686D0 GB8720686D0 (en) 1987-10-07
GB2195917A true GB2195917A (en) 1988-04-20

Family

ID=10605306

Family Applications (2)

Application Number Title Priority Date Filing Date
GB868623909A Pending GB8623909D0 (en) 1986-10-06 1986-10-06 Air filters
GB08720686A Withdrawn GB2195917A (en) 1986-10-06 1987-09-03 Filter element

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB868623909A Pending GB8623909D0 (en) 1986-10-06 1986-10-06 Air filters

Country Status (1)

Country Link
GB (2) GB8623909D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1136113A1 (en) * 2000-03-16 2001-09-26 Nelson Industries, Inc. Fibrous filter media and fluid filter assembly
EP2332630A1 (en) * 2009-11-18 2011-06-15 Covidien AG Filter for a breathing circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB851247A (en) * 1958-07-11 1960-10-12 Fibreglass Ltd Replaceable filter units
GB857231A (en) * 1958-06-20 1960-12-29 Cambridge Filter Mfg Corp Filters for gases and vapours
GB1221310A (en) * 1967-02-08 1971-02-03 Filtration Soc Ind De Improvements in or relating to filter elements
GB1236093A (en) * 1968-06-06 1971-06-16 Gen Motors Ltd Filters
GB1408194A (en) * 1971-07-28 1975-10-01 Delbag Luftfilter Gmbh Filter pack and method for forming the same
GB2162767A (en) * 1984-08-09 1986-02-12 Labinal Folded filter packing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB857231A (en) * 1958-06-20 1960-12-29 Cambridge Filter Mfg Corp Filters for gases and vapours
GB851247A (en) * 1958-07-11 1960-10-12 Fibreglass Ltd Replaceable filter units
GB1221310A (en) * 1967-02-08 1971-02-03 Filtration Soc Ind De Improvements in or relating to filter elements
GB1236093A (en) * 1968-06-06 1971-06-16 Gen Motors Ltd Filters
GB1408194A (en) * 1971-07-28 1975-10-01 Delbag Luftfilter Gmbh Filter pack and method for forming the same
GB2162767A (en) * 1984-08-09 1986-02-12 Labinal Folded filter packing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1136113A1 (en) * 2000-03-16 2001-09-26 Nelson Industries, Inc. Fibrous filter media and fluid filter assembly
US6387144B1 (en) 2000-03-16 2002-05-14 Nelson Industries, Inc. Enhanced performance fibrous filter media and extended life fluid filter assembly
EP2332630A1 (en) * 2009-11-18 2011-06-15 Covidien AG Filter for a breathing circuit

Also Published As

Publication number Publication date
GB8720686D0 (en) 1987-10-07
GB8623909D0 (en) 1986-11-12

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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)