US3880628A - Compact filter cells - Google Patents

Compact filter cells Download PDF

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Publication number
US3880628A
US3880628A US474963A US47496374A US3880628A US 3880628 A US3880628 A US 3880628A US 474963 A US474963 A US 474963A US 47496374 A US47496374 A US 47496374A US 3880628 A US3880628 A US 3880628A
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US
United States
Prior art keywords
passages
frame
filter
cassette
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US474963A
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English (en)
Inventor
Karl-Axel G Gustavsson
Holger A Persson
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.)
BAHCO VENTILATION CORP AB
Original Assignee
BAHCO VENTILATION CORP AB
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 BAHCO VENTILATION CORP AB filed Critical BAHCO VENTILATION CORP AB
Application granted granted Critical
Publication of US3880628A publication Critical patent/US3880628A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • 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
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds

Definitions

  • ABSTRACT A securing and guiding arrangement for compact filter cells of the type comprising a web of textile material folded into a number of deep, transversely extending folds and having longitudinally extending seams at each fold to provide a predetermined number of mutually and identical passages for purified gas. All of the passages are open in one and the same mutual direction and are closed in the opposite direction (at the bottom of the fold). and each of the passages are provided with a shaping member which imparts thereto a particular cross-sectional shape which may be a square shape.
  • the member has a diagonal which coincides with the direction in which the row of passages extends. and the two remaining corners of the member lie against corresponding corners of passages in adjacent rows of passages. and each of the rows of passages for purified gas is surrounded by rows of mutually parallel crude-gas passages formed between the folds and having the same square cross-sectional shape as the purified-gas passages.
  • the crude-gas passages are open in one and the same mutual direction which is opposite to that of the purified-gas passages. and are closed in the opposite direction in an upper frame which comprises part of a rightangled parallel epipedic filter cassette. This frame is arranged to be brought.
  • the cassettes in addition to the upper frame. is provided with a corresponding lower frame and with frame portions which connect the upper and lower frames at the corners thereof.
  • the upper frame has the form of an upwardly open U-shaped section. suitably having slightly converging flanges whose edge portion are folded inwardly through an angle of zip proximately 180. and which is provided with a number of transverse support stays having rounded upper edges.
  • the stays are securely connected to the upper frame in positions which coincide with a central plane in the crude-gas passages
  • the lower frame is provided with transverse distance stays arranged in the central plane of the crude-gas passage rows, which distance stays together with the shaping member fix the passages against lateral movement in that the compact filter cell along all side edges at the side where the puri fertil gas passages are open is provided with a fold edge of such width that it can be folded in and shaped along at least the inner flange and the bottom of the U- shaped section of the upper cassette frame and be retained in position by means of a resilient sealing strip which when seen in cross section, is rectangular of frusto-triangular in shape and which has a greater height than the flanges.
  • the sealing strip subsequent to the filter cassette is connected to the connecting frame of the filter housing and arranged to provide sealing between the cassette and the filter housing and between the filter cell and the cassette frame and to increase the securing forces of the folding edges in the U-shaped section so as to provide an operably reliable filter unit.
  • the present invention relates to a securing and guiding arrangement for compact filter cells of the type comprising a web of textile material folded into a number of deep, transversely extending folds and having longitudinally extending seams at each fold to provide a predetermined number of mutually parallel and identical passages for purified gas, all of said passages being open in one and the same mutual direction and being closed in the opposite direction (at the bottom of the fold), and each of said passages being provided with a shaping member imparts thereto a particular crosssectional shape, which may be a square shape, said member having a diagonal which coincides with the direction in which the row of passages extends, and wherein the two remaining corners of said member lie against corresponding corners of passages in adjacent rows of passages, and wherein each of said rows of passages for purified gas is surrounded by rows of mutually parallel crudegas passages formed between the folds and having the same square cross-sectional shape as said purified-gas passages, said crude gas
  • the main problem associated with such filter cells is that because when mounting the filter cells in position in the housing the edge band of the filter cells becomes wrinkled, giving rise to leakages, it is difficult to secure said edge band to the upper frame portion in a manner to obtain a seal which is satisfactory at the high pres sure drops occurring with such filters. Furthermore, the rows of purified gas passages tend to become displaced in relation to each other as the filter is fitted to the housing, thereby causing the cross-sectional areas of the crude gas passages located between said purifiedgas passages to vary and the filter cell to become unbalanced as a consequence thereof.
  • the upper frame has the form of an upwardly open U- shaped section, suitably having slightly converging flanges whose edge portions are folded inwardly through an angle of approximately 180, and which is provided with a number of transverse support stays having rounded upper edges, said stays being securely connected to said upper frame in positions which coincide with a central plane in the crude-gas passages;
  • the lower frame is provided with transverse distance stays arranged in the central plane of the crudegas passage rows, which distance stays together with said shaping member fix the passages against lateral movement in that the compact filter cell along all side edges at the side where the purified-gas passages are open is provided with a fold edge of such width that it can be folded in and shaped along at least the inner flange and the bottom of the U-shaped section of the upper cassette frame and be retained in position by means of a resilient sealing strip which, when seen in cross section, is rectangular or frusto-triangular in shape and
  • the support stays serve to take-up the high pressure load acting on the filter cell, which load occurs at the exit end of the filter cell, i.e., at the upper frame, when the filter is being blown clean.
  • FIG. I is a perspective view of a filter cassette frame according to the invention, having a compact filter of the folded-web type mounted therein.
  • FIG. 2 is an enlarged, cross-sectional view of part of the upper frame shown in FIG. 1.
  • FIG. 3 is an enlarged view of part of the upper frame shown in FIG. 1, and illustrates the manner in which a supporting stay is secured in said upper frame, and
  • FIG. 4 is an enlarged view of a corner of the cassette frame shown in FIG. 1 from beneath.
  • the cassette frame shown in FIG. 1 comprises a rectangular upper frame 1 and a rectangular lower frame 2 having the same size as the upper frame 1.
  • the corners of the upper and lower frames are connected together by means of straight rods 3 which are of equal length and which extend normal to the frames.
  • a compact filter of the folded web type 4 secured to the upper frame is a compact filter of the folded web type 4.
  • the compact filter is provided with inserts 5 which are arranged to impart to the gas passages arranged in the filter a square-sectional shape.
  • the upper frame is provided between two opposing sides thereof with a number of parallel support stays 6 for supporting the folds in the compact filter.
  • a support stay arranged for each fold and said stay is preferably in the form of a sheet-metal strip having edge portions folded through to strengthen said strip, as disclosed in FIG. 3.
  • the support stays are preferably secured to the upper frame as by welding.
  • the upper frame 1 has the form of a U-shaped sheet-metal bar into which the edge band 8 of the compact filter 4 is inserted so that said band extends over practically the entire bottom surface of a groove 9 located in the bar.
  • the band is held securely in this position by means of a scaling strip 10 which presses said band against the bottom of the groove 9 and against one flange of the bar or upper frame 1.
  • the sealing strip 10 is suitably made of sponge rubber or some other appropriate resilient material.
  • the sealing strip 10 provides a fully satisfactory seal. despite the fact that the band cannot be inserted into the bar or upper frame without said band becoming wrinkled. This sealing effect of the strip 10 can be facilitated by causing the flanges of the upper frame 1 to converge slightly, as shown in FIG. 2.
  • a distance stay 7 is passed through a hole 11 located in the under frame 2 so as to hold apart the rows of purified-gas passages 12, so that intermediate crude-gas passages 13 retain their square cross-sectional shape.
  • FIG. 4 shows a corner of the cassette frame according to FIG. 1 from beneath.
  • the distance stays 7 are secured to the under frame 2 by bending the edges of said stays around adjacent portions of the frame.
  • the distance stays may be secured to the frame in another manner, such as by welding for example.
  • the under frame may comprise bars of U-shaped cross section, while the rods connecting the upper and lower frames may comprise L-shaped rods welded to said frames.
  • a securing and guiding arrangement for compact filter cells of the type comprising a web of textile material folded into a number of deep, transversely extending folds and having longitudinally extending seams at each fold to provide a predetermined number of mutually and identical passages for purified gas, all of said passages being open in one and the same mutual direction and being closed in the opposite direction (at the bottom of the fold), and each of said passages being provided with a shaping member which imparts thereto a particular cross-sectional shape which may be a square shape, said member having a diagonal which coincides with the direction in which the row of passages extends, and wherein two remaining corners of said member lie against corresponding corners of passages in adjacent rows of passages, and wherein each of said rows of passages for purified gas is surrounded by rows of mutually parallel crude-gas passages formed between the folds and having the same square crosssectional shape as said purified-gas passages, said crude-gas passages being open in one and the same mutual direction which is opposite to that of the purifiedgas passage

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Motor Or Generator Current Collectors (AREA)
US474963A 1973-06-06 1974-05-31 Compact filter cells Expired - Lifetime US3880628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7307986A SE373294B (sv) 1973-06-06 1973-06-06 Anordning for infestning och styrning av kompaktfilterceller

Publications (1)

Publication Number Publication Date
US3880628A true US3880628A (en) 1975-04-29

Family

ID=20317690

Family Applications (1)

Application Number Title Priority Date Filing Date
US474963A Expired - Lifetime US3880628A (en) 1973-06-06 1974-05-31 Compact filter cells

Country Status (8)

Country Link
US (1) US3880628A (xx)
JP (1) JPS50100671A (xx)
DE (1) DE2424339C2 (xx)
DK (1) DK143971C (xx)
FI (1) FI55120C (xx)
FR (1) FR2232351B1 (xx)
NO (1) NO133015C (xx)
SE (1) SE373294B (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072484A (en) * 1975-07-25 1978-02-07 Air Industrie Bag filter
US4123239A (en) * 1976-08-31 1978-10-31 Aktiebolgatet Svenska Flaktfabriken Filter in a cassette frame
US4129428A (en) * 1976-08-31 1978-12-12 Aktiebolgatet Svenska Flaktfabriken Compact filter mounted in a cassette frame
US4213771A (en) * 1977-07-05 1980-07-22 Air Industrie Filter and method of making
US20090293464A1 (en) * 2008-05-30 2009-12-03 Caterpillar Inc. Assembly and method of assembly for exhaust treatment
CN105013258A (zh) * 2015-07-10 2015-11-04 安徽省农业科学院畜牧兽医研究所 一种用于笼养鸡舍的排出气体过滤装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473471A (en) * 1982-09-13 1984-09-25 Purolator Inc. Filter sealing gasket with reinforcement ring
WO2020112482A1 (en) * 2018-11-29 2020-06-04 Cummins Filtration Ip, Inc. Improved layered filter frame

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1049789A (en) * 1911-05-29 1913-01-07 Allis Chalmers Filter.
US2980208A (en) * 1957-05-21 1961-04-18 Delbag Luftfilter Gmbh Filter element for extremely fine dust
US3479803A (en) * 1967-01-23 1969-11-25 American Air Filter Co Pocket-type filter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1352676A (fr) * 1962-05-09 1964-02-14 Euresis Ets Cassette pour l'insertion de feuilles de filtrage d'air

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1049789A (en) * 1911-05-29 1913-01-07 Allis Chalmers Filter.
US2980208A (en) * 1957-05-21 1961-04-18 Delbag Luftfilter Gmbh Filter element for extremely fine dust
US3479803A (en) * 1967-01-23 1969-11-25 American Air Filter Co Pocket-type filter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072484A (en) * 1975-07-25 1978-02-07 Air Industrie Bag filter
US4123239A (en) * 1976-08-31 1978-10-31 Aktiebolgatet Svenska Flaktfabriken Filter in a cassette frame
US4129428A (en) * 1976-08-31 1978-12-12 Aktiebolgatet Svenska Flaktfabriken Compact filter mounted in a cassette frame
US4213771A (en) * 1977-07-05 1980-07-22 Air Industrie Filter and method of making
US20090293464A1 (en) * 2008-05-30 2009-12-03 Caterpillar Inc. Assembly and method of assembly for exhaust treatment
CN105013258A (zh) * 2015-07-10 2015-11-04 安徽省农业科学院畜牧兽医研究所 一种用于笼养鸡舍的排出气体过滤装置

Also Published As

Publication number Publication date
DE2424339C2 (de) 1984-11-15
DE2424339A1 (de) 1975-01-02
FR2232351B1 (xx) 1978-01-13
FI172874A (xx) 1974-12-07
DK281474A (xx) 1975-01-20
NO133015C (xx) 1976-02-25
DK143971C (da) 1982-05-24
FR2232351A1 (xx) 1975-01-03
DK143971B (da) 1981-11-09
SE7307986L (xx) 1974-12-09
NO133015B (xx) 1975-11-17
FI55120B (fi) 1979-02-28
FI55120C (fi) 1979-06-11
JPS50100671A (xx) 1975-08-09
SE373294B (sv) 1975-02-03

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