GB2088421A - Perforated sheet material and tubes for fluid filters - Google Patents
Perforated sheet material and tubes for fluid filters Download PDFInfo
- Publication number
- GB2088421A GB2088421A GB8135497A GB8135497A GB2088421A GB 2088421 A GB2088421 A GB 2088421A GB 8135497 A GB8135497 A GB 8135497A GB 8135497 A GB8135497 A GB 8135497A GB 2088421 A GB2088421 A GB 2088421A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet material
- perforated
- corrugations
- tube
- sheet
- 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- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 57
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
-
- 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
- B01D29/11—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 bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2265/06—Details of supporting structures for filtering material, e.g. cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
- B01D2275/105—Wound layers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A perforated tube for use in a fluid filter is formed of perforated sheet material, e.g. metal, the sheet metal being formed with parallel spaced corrugations (10, 11) having apertures (16) formed in the flanks (14, 15) of the corrugations. The upper lip (18) of each aperture has a blunt upper edge (19) and a sharp lower edge (20) while the lower lip of each aperture has a blunt lower edge and a sharp upper edge, thus avoiding sharp edges on both the upper and lower surfaces of the sheet. The flanks of the corrugations may be deformed between the apertures (16) to form inclined louvre slits and adjacent bands of louvres are inclined in opposite directions. The filter element is formed from two such concentric tubes with intervening fibrous filter material. <IMAGE>
Description
SPECIFICATION
Perforated sheet material and tubes for fluid filters
This invention relates to improved constructions of perforated sheet material and tubes and is particularly though not exclusively applicable to materials and tubes for use in fluid filters, silencers, baffles, or drains.
It is well known to construct fluid filters with a rigid perforated tube, usually of sheet metal, having a surrounding sheath or tube of a woven or felted fibrous filter material. It is important that the tube should be rigid and of sufficient strength to withstand the fluid pressure forces. In addition the tube must present an adequate total fluid flow cross-section and it is important that it should be economic in cost, easy to manufacture and preferably of such construction that it will not damage the fibrous filter material in contact with the tube.
Existing sheet materials and tubes suffer from many disadvantages. The perforations are usually formed by punching which can give an adequate fluid cross sectional area but can seriously weaken the tube. To maintain the strength of the tube the thickness of the sheet material can be increased but naturally this increases the cost of the material and in some instances suitable sheet material is not commercially available. Attempts have also been made to strengthen the tube by forming corrugations. Wave form corrugations however require additional sheet material since they tend to shorten the effective length of the tube, and again this results in the need for extra material at extra expense.In all cases where apertures are formed by punched openings the edges of the aperture on the punch inlet side of the material will be relatively blunt but the edges on the opposite punch exit side will be burred or sharp.
It is an object of the present invention to reduce or overcome some of these existing disadvantages and from one aspect the invention consists in perforated sheet material in which the apertures present relatively blunt edges on both sides of the sheet.
From another aspect the invention consists in perforated sheet material in which the apertures are in the form of slits located at least partly in the flanks of corrugations in the sheet material.
From yet another aspect the invention consists in perforated sheet material in which the apertures are in the form of slits, and adjacent parts of the sheet material on opposite sides of each slit are deformed relatively in opposite directions relative to the plane of the sheet.
The invention is also applicable readily to the manufacture of sheet material which avoids direct through openings perpendicular to the plane of the sheet. Thus from another aspect the invention consists in perforated sheet material in which the apertures are in the form of slits and an adjacent part of the sheet material on one side of each slit is inclined relative to the plane of the sheet material, thus forming louvres.
Extra advantages are obtained by a combination of perforations and corrugations and from yet another aspect the invention consists in
perforated and corrugated sheet material in which
the perforations are formed in the flanks of the
corrugations.
The invention also resides in a perforated tube, for example for use in a fluid filter, formed from
sheet material in any of the the forms defined
above. The tube may be formed from a coiled
strip of the sheet material wound into a cylindrical tube with a helical seam. Where sheet material
has corrugations these will preferably extend
helically around the tube.
The invention may be performed in various ways and one specific embodiment with a number of possible modifications will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a perspective view partly in crosssection, on an enlarged scale, illustrating part of a piece of perforated sheet material in accordance with the invention,
Figure 2 is a perspective view on a different scale illustrating a construction of a perforated tube formed from such material,
Figure 3 is another perspective view somewhat similar to Figure 1 illustrating a different
construction of sheet material, and
Figure 4 is a perspective view, partly broken
away, illustrating a filter element including two
perforated tubes formed in accordance with the
invention.
The sheet material illustrated in Figure 1 is formed from thin sheet metal of any required specification and is formed with transverse corrugations 10 depressed downwards as seen in
Figure 1 with inter-posed upward corrugations 11.
The corrugations have substantially flat parallel
summits 12 and bottoms 13 and the flanks 14, 1 5 are substantially perpendicular to the summits and
bottoms. The apertures 16 are in the form of
narrow slits formed in the flanks 14 and 15. Each
aperture extends upwards close to the respective
summit 12 and downwards to the respective
bottom 13. The upper lip 18 of each slit has a
relatively blunt upper edge 19 and a burred or
sharp lower edge 20. Likewise the bottom lip 21
of each slit has a burred or sharp upper edge and a
blunt lower edge. Thus it will be seen that where
the two lips of the slit approach or break into the
respective summit and bottom the edge of the lip
which lies on the exposed face of the summit or
bottom is blunt.Thus both sides of the corrugated
and perforated sheet material present relatively
smooth blunt edges which will be less likely to
damage any fibrous filter material in contact
therewith.
A further advantage of the construction is that
the corrugations and slits can be rolled flat if
required to form a continuous edge 25, for
example for joining or seaming purposes, without
any substantial increase in the dimensions of the
sheet, as would occur if wave form corrugations
are flattened.
Figure 2 illustrates this same sheet material used in the construction of tube 27 for use in a fluid filter. The fibrous filter medium and the filter casing are omitted for clarity. Conveniently the sheet material is formed as a continuous narrow sheet which is wound into a helix and joined along a helical seam 28. The corrugations 10 and 1 1 thus run helically around the tube.
Figure 3 illustrates another form of corrugated slitted sheet material according to the invention in which adjacent parts of the sheet material along one side of the slit are deformed and inclined as illustrated at 30 to form louvres. Conveniently the slope of the louvres is reversed in different sections of the material as shown at 31 and 32.
Also in this construction the corrugations 10 and
11 do not extend continuously but are interrupted or reduced in depth spaced positions along the length of each corrugation, as illustrated at 33.
It will be noted from Figures 2, 3 and 4 that the louvres 30 are arranged in separate bands or banks 35, 36 the louvres of each band sloping in opposite directions. It is found that this is very valuable in producing a balanced flow of the fluid through the filter, and also assists in another objective of the invention, to avoid damage to the filter material.
The sheet material and perforated tubes of the invention may be formed in a variety of different materials including ferrous and non-ferrous metals, composite materials and synthetic plastics. The perforations and corrugations may be formed by a variety of different processes and conveniently by the use of high speed rotary tools which simultaneously form the corrugations and produce the slits by shearing process.
The use of louvres combined with the slits has important advantages in baffle (silencer) and filtration applications, since it tends to cause turbulent and multidirectional flow, and so improve performance. The invention may be applied generally in a wide field of fluid flow applications, including for example aeration feed pipes for grain silos, and water pipes for land drainage, gas or liquid filters. The filter material 40 in Figure 4 is sandwiched between inner and outer tubes 41, 42 each constructed in the manner described above the apertures in the tubes permitting fluid flow radially inwards or outwards through the filter material in accordance with the design requirements. There may be very heavy fluid pressure differentials across the filter resulting in heavy loads where the filter material rests against the perforated inner or outer tube.
Claims (10)
1. Perforated sheet material in which the apertures present relatively blunt edges on both sides of the sheet.
2. Perforated sheet material in which the apertures are in the form of slits located at least partly in the flanks of corrugations in the sheet material.
3. Perforated sheet material in which the apetures are in the form of slits, and adjacent parts of the sheet material on opposite sides of each slit are deformed relatively in opposite directions relative to the plane of the sheet.
4. Perforated sheet material in which the apertures are in the form of slits and an adjacent part of the sheet material on one side of each slit is inclined relative to the plane of the sheet material, thus forming louvres.
5. Perforated and corrugated sheet material in which the perforations are formed in the flanks of the corrugations.
6. A perforated tube formed from sheet material in accordance with any one of the preceding claims.
7. A perforated tube according to Claim 6
8. A perforated tube according to Claim 6 or
Claim 7, in which the sheet material has
corrugations which extend helically around the tube.
9. A perforated tube according to any of Claims
6, 7 or 8, in which the sheet material is a strip of
limited width, wound helically to form the tube,
and provided with a rolled-seam along its helical joint.
10. A fluid filter including a perforated tube as
claimed in any of Claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8135497A GB2088421A (en) | 1980-11-28 | 1981-11-25 | Perforated sheet material and tubes for fluid filters |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8038224 | 1980-11-28 | ||
| GB8135497A GB2088421A (en) | 1980-11-28 | 1981-11-25 | Perforated sheet material and tubes for fluid filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2088421A true GB2088421A (en) | 1982-06-09 |
Family
ID=26277654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8135497A Withdrawn GB2088421A (en) | 1980-11-28 | 1981-11-25 | Perforated sheet material and tubes for fluid filters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2088421A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991002209A1 (en) * | 1989-07-28 | 1991-02-21 | Anthony Joseph Cesaroni | Panel heat exchanger |
| WO1991002208A1 (en) * | 1989-07-28 | 1991-02-21 | Anthony Joseph Cesaroni | Corrugated thermoplastic sheet having fluid flow passages |
| WO1996031271A1 (en) * | 1995-04-07 | 1996-10-10 | Baker Hughes Incorporated | Wire mesh filter |
| US5642781A (en) * | 1994-10-07 | 1997-07-01 | Baker Hughes Incorporated | Multi-passage sand control screen |
| GB2337709A (en) * | 1995-04-07 | 1999-12-01 | Baker Hughes Inc | Downhole filter with protective jacket |
| CN104588489A (en) * | 2014-11-19 | 2015-05-06 | 浙江环球滤清器有限公司 | Manufacturing method for spiral filtering net and filtering net forming mechanism of manufacturing method |
| EP2559471A3 (en) * | 2011-08-18 | 2016-12-07 | BHA Altair, LLC | Filter core for use with pleated filter cartridges |
| DE102019130770A1 (en) * | 2019-11-14 | 2021-05-20 | Mann+Hummel Gmbh | Separation component for a filter element |
-
1981
- 1981-11-25 GB GB8135497A patent/GB2088421A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991002208A1 (en) * | 1989-07-28 | 1991-02-21 | Anthony Joseph Cesaroni | Corrugated thermoplastic sheet having fluid flow passages |
| AU633607B2 (en) * | 1989-07-28 | 1993-02-04 | Anthony Joseph Cesaroni | Corrugated thermoplastic sheet having fluid flow passages |
| WO1991002209A1 (en) * | 1989-07-28 | 1991-02-21 | Anthony Joseph Cesaroni | Panel heat exchanger |
| US5980745A (en) * | 1994-10-07 | 1999-11-09 | Baker Hughes Incorporated | Wire mesh filter |
| US5642781A (en) * | 1994-10-07 | 1997-07-01 | Baker Hughes Incorporated | Multi-passage sand control screen |
| GB2337709A (en) * | 1995-04-07 | 1999-12-01 | Baker Hughes Inc | Downhole filter with protective jacket |
| US5849188A (en) * | 1995-04-07 | 1998-12-15 | Baker Hughes Incorporated | Wire mesh filter |
| GB2314282A (en) * | 1995-04-07 | 1997-12-24 | Baker Hughes Inc | Wire mesh filter |
| WO1996031271A1 (en) * | 1995-04-07 | 1996-10-10 | Baker Hughes Incorporated | Wire mesh filter |
| GB2314282B (en) * | 1995-04-07 | 1999-12-01 | Baker Hughes Inc | Wire mesh filter |
| GB2337709B (en) * | 1995-04-07 | 2000-01-19 | Baker Hughes Inc | Protective filter jacket |
| EP2559471A3 (en) * | 2011-08-18 | 2016-12-07 | BHA Altair, LLC | Filter core for use with pleated filter cartridges |
| CN104588489A (en) * | 2014-11-19 | 2015-05-06 | 浙江环球滤清器有限公司 | Manufacturing method for spiral filtering net and filtering net forming mechanism of manufacturing method |
| CN104588489B (en) * | 2014-11-19 | 2017-02-22 | 浙江环球滤清器有限公司 | Manufacturing method for spiral filtering net and filtering net forming mechanism of manufacturing method |
| DE102019130770A1 (en) * | 2019-11-14 | 2021-05-20 | Mann+Hummel Gmbh | Separation component for a filter element |
| CN114667178A (en) * | 2019-11-14 | 2022-06-24 | 曼·胡默尔有限公司 | Separating member for filter element |
| CN114667178B (en) * | 2019-11-14 | 2023-09-05 | 曼·胡默尔有限公司 | Separating member for a filter element |
| DE112020005785B4 (en) | 2019-11-14 | 2024-02-01 | Mann+Hummel Gmbh | Separation component for a filter element, filter element, filter device and manufacturing method |
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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) |