GB2046613A - Cartridge filter - Google Patents
Cartridge filter Download PDFInfo
- Publication number
- GB2046613A GB2046613A GB8012834A GB8012834A GB2046613A GB 2046613 A GB2046613 A GB 2046613A GB 8012834 A GB8012834 A GB 8012834A GB 8012834 A GB8012834 A GB 8012834A GB 2046613 A GB2046613 A GB 2046613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- tube
- sleeve
- outlet
- filter tube
- 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.)
- Granted
Links
- 239000004677 Nylon Substances 0.000 claims abstract description 5
- 239000003365 glass fiber Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 229920001778 nylon Polymers 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 229920001410 Microfiber Polymers 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000003658 microfiber Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000011045 prefiltration Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- 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
- 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
- B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
- B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—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 multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
-
- 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
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
- B01D46/0043—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding containing fixed gas displacement elements or cores
-
- 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
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0047—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for discharging the filtered gas
-
- 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
-
- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
- B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
-
- 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
Abstract
A cartridge filter for filtering fluid under pressure comprises a filter sleeve 3 held between an inlet end cap and an outlet end cap 2. In addition to the sleeve 3, in order to provide increased filter area, there is a filter tube 9 arranged co-axially inside the sleeve 3 with a clearance 28. The end 10 of the tube 9 adjacent the inlet end cap 1 is closed and the other end of the tube 9 is open to the outlet 6 so that liquid or gas flowing in through the inlet 12 is filtered in part by flowing outwards from the clearance 28 through the wall of the sleeve 3 and in part by flowing inwards through the wall of the tube 9 and thence through the outlet 6. Sleeve 3 and tube 9 each comprise a pair of concentric perforate metal tubes sandwiching outer layers of nylon fibres and a middle layer of glass fibres. <IMAGE>
Description
SPECIFICATION
Cartridge filter
This invention relates to cartridge filters for gas or liquid under pressure comprising a filter sleeve held between two end covers.
German Auslegeschrift No 2506359 describes a filter with a bomb-shaped filter housing which, by means of a collar piece, is connected to an inlet and outlet head having an inlet duct and an outlet duct.
Intoithe head a tubular filter element which has a screwthreaded piece, is screwed. The screwthreaded piece functions as an end cover. The screwthreaded piece has openings which provide communication between the inlet duct and the inside of the screwthreaded piece and thus the inside of the filter element. The cartridge also has another end cover at the other end of the element and the end cover is connected to the screwthreaded piece by a tension rod. The filter element which is in the form of a synthetic resin bonded microporous cylindrical sleeve with a plurality of micropores is clamped between the end covers and its ends engage in annular grooves in the end covers.
The filter element is surrounded by a further cylindrical sleeve of porous material which acts asa mechanical support for the filter element against the outwardly directed pressure of the fluid being filtered in its passage from the inside of the cartridge into the surrounding space within the housing.
Since the pores of the filter element become clogged up relatively quickly, a high differential pressure develops across the elements of these filters even after a short period. Although the filter element has a certain individual strength, because of the resin bonded fibrous materials of which it is formed, the sticking together of the fibre ends that this results in does lead to various disadvantages. In this connection the relatively small volume of free space in the element should be mentioned, since this has the result in that less dirt can be stored and this leads to a relatively short service life of the filter element as well as an increasing deterioration in its efficiency.
The variety of uses of these known types of filters as well as their life expectancy is thus relatively small, a fact which makes these filter elements not very economical to use.
German Offenlegungsschrift No 2706017 describes a filter wherein a hollow cylindrical filter element is held between two end covers. One end cover is provided with a central inlet opening extending through a projection which has an external screwthread co-axial with the filter element. A sealing ring is provided around the projection below the external screwthread ensures that the space containing the fluid to be filtered is sealed from the space which contains the filter fluid.
It is an object of the present invention to provide a cartridge filter comprising a filter sleeve held between two end covers which while occupying the same space as existing such cartridge filters, provides a considerable increase both in the filter surface area and in the throughput capacity of the fluid to be filtered.
To this end, according to this invention, in such a cartridge filter, a filter tube extends substantially co-axially with a clearance within the filter sleeve, the filter tube being closed at its end adjacent one end cover and open to an outlet at its other end so that part of the gas or liquid flowing in through an inlet in one of the end covers is filtered by flowing outwards from the clearance through the wall of the filter sleeve and part is filtered by flowing inwards through the wall of the filter tube and thence through the outlet.
In this way, it is possible to make a filter the outside of which can hardly be distinguished from the known type of filter such as that described in German Offenlegungsschrift No 27 06 017, and the filter housing does not have to be altered. The filter element of the filter in accordance with the invention in effect forms two separate filter elements one inside the other and for the same space almost doubles the throughput capacity. Filtered off impurities are collected on one end cover, that is the bottom end of the annular space between the filter sleeve and tube and the filtered fluid flows away at both sides of the space.
The bottom end cover may be provided with a central fluid outlet opening. The filter tube is then closed at the upper end, for example by a cap. This forces the fluid to be filtered which flow in through an inlet opening in the top end cover to flow out of the annular space between the filter sleeve and the filter tube outwards through the filter sleeve and inwards through the filter tube. Advantageously the lower cover is in the form of a ring having two concentrically extending annular grooves, one receiving the end of the filter sleeve and the other receiving the end of the filter tube. The grooves are adjacent the inner and outer peripheries of the ring. The sleeve and the tube may be adhesively fixed to the lower cover.
Preferably the cap closing one end of the filter tube is provided with a beaded edge and a circular groove, the cap being fitted over the upper edge of the filter tube and adhesively secured thereto.
The filter tube may comprise two co-axial support cylinders with throughput perforations and between the cylinders there is a laminated filter material of varying porosity, a lamination having fine pores at least on the inlet face of the tube being covered with a less finely porous lamination. Preferably, the filter material is composed of three layers and a centre layer is composed of a microfibre fabric free of binding agents and both sides of this are covered by a layer of support fibre fabric free of binding agents.
The microfibre fabric may be composed of glass fibres, whereas the support fibre fabric may be in the form of a prefilter composed of nylon fibres.
The filter sleeve surrounding the filter tube has essentially the same structure as that of the filter tube, but may have an additional filter jacket fitting around its outer surface. If the filter is used for separating oil from compressed air, the filter jacket ensures that the filtered airstream is free of aerosol.
An example of a filter in accordance with the invention is illustrated in the accompanying drawings; in which:
Figure 1 is a perspective view of the filter with parts broken away;
Figure 2 is a diagrammatic cross-section through the filter of Figure 1; and,
Figure 3 is a detail to a larger scale of part of the filter shown at A in Figure 2.
A filter sleeve 3 is held between an upper end cover 1 and a lower end cover 2. The sleeve 3 fits into an annular groove 4 provided in the upper end cover 1 and into an annular groove 5 provided in the lower end cover 2 and is adhesively secured therein. The lower cover 2 has a central outlet opening 6 so as to form a ring 7. In the vicinity of the inner edge of the ring 7 there is provided an annular groove 8 in which one end of a filter tube 9 is fitted and adhesively secured.
The filter tube 9 is sealed by a cap-like member 10 at its top end. The cap 10 in the central area is slightly pushed downwards.
The upper cover 1 has a central inlet opening 11 extending through a projection with an external screwthread which is co-axial with the filter sleeve 3 and is used for screw-connecting the filter in an inlet pipe to a housing which is not shown in the drawing.
On a circular shoulder 13 ofthetop cover 1 there is a sealing ring 14 which seals the fluid to be filtered from the filtering fluid.
The filter tube 9 is composed of two co-axial support jackets 15, 16 made from stainless steel and having perforations 17. A central layer 18 (Figure 3) of filter material is composed of a binder-free microfibre material, preferably glass fibre based, and having a very large space volume with considerable depth effect, amounting to a filter medium which has a three-dimensional effect.
The inner and outer surfaces of the central layer 18 are free of binder and are covered with layers 19. 20 of fibrous supporting material including nylon fibres.
The support layers 19,20 have pores which are not as fine as those of the central layer 18 and provide a sort of prefilter which substantially increases the effectiveness and life expectancy of the filter element and ensures lasting operating reliability.
In its construction the filter sleeve 3 largely corresponds to that of the filter tube 9. Here again, the filter material is arranged between two concentric support jackets 21,22 made of perforated stainless steel and comprises a centre layer 23 composed of a binderfree glass fibre based on microfibre fabric as well as two cover layers 24 and 25 made of nylon support fibre fabric. Additionally the filter sleeve 3 is surrounded by a filter jacket 26 which completely surrounds the outer surface of the filter sleeve 3 and is made from a soft material.
The arrangement of the prefilter and support layers on both sides of the central microfibrefabric in both the filter tube and the filter sleeve enables the flow direction through the filter material to be effectively reversed for cleaning purposed for example.
For filtering for example a gas, the gas flows in the direction of the arrow 27 through the inlet opening 11 in the upper cover 1 into the space above the cap 10. From here the gas to be filtered is evenly dispersed in the annular chamber 28 between the filter sleeve 3 and the filter tube 9. Because of the pressure build-up in the annular chamber 28 the gas to be filtered flows in the direction of the arrows 29,30 through the filter sleeve 3 outwardly and in the direction of the arrows 31,32 through the filter tu be 9 into the space 33 within the filter tu be 9 and thence flows out through the outlet opening 6 in the bottom cover 2.
Claims (10)
1. A cartridge filter for filtering gas or liquid under pressure comprising a filter sleeve held between two end covers, wherein a filter tube extends substantially co-axially with a clearance within the filter sleeve, the filter tube being closed at its end adjacent one end cover and open to an outlet at its other end so that part of the gas or liquid flowing in through an inlet in one of the end covers is filtered by flowing outwards from the clearance through the wall of the filter sleeve and part is filtered by flowing inwards through the wall of the filter tube and thence through the outlet.
2. A filter according to claim 1, in which the outlet is a central opening in one end cover and the filter tube is sealed by a cap at its end adjacent the other end cover.
3. Afilter according to claim 2, in which one cover comprises a ring having two concentric annular grooves provided adjacent its inner and outer peripheries, one end of the sleeve fitting in the outer groove and one end of the tube fitting in the inner groove.
4. A filter according to claim 3, in which the ends of the filter sleeve and of the filter tube are adhesively secured in the grooves.
5. A filter according to any one of claims 1 to 4, in which the end of the filter tube, which is closed, is closed by a cap which has a flanged edge with a circular groove in which the end of the filter tube fits and is adhesively fixed.
6. A filter according to any one of the preceding claims, in which the filter tube andlor the sleeve comprises two co-axial jacket support cylinders having perforations and, between the cylinders, filter material composed of a plurality of layers of varying porosity a layer with fine pores being covered on the inlet face of the tube with a layer having less fine pores.
7. A filter according to claim 6, in which the filter material is composed of three layers, the centre layer being composed of a microfibre fabric which is free from binding agents covered on each side by s layer of binder-free support fibre fabric.
8. A filter according to claim 7, in which the microfibre fabric is composed of glass fibres andthe support fibre fabric is composed of nylon fibres.
9. A filter according to any one of claims 1 to 8, in which the filter sleeve is constructed similarly to the filter tube and is additionally surrounded by a filter jacket composed of filter material.
10. A filter according to claim 1, substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792915819 DE2915819A1 (en) | 1979-04-19 | 1979-04-19 | CARTRIDGE FILTER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2046613A true GB2046613A (en) | 1980-11-19 |
| GB2046613B GB2046613B (en) | 1983-03-16 |
Family
ID=6068716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8012834A Expired GB2046613B (en) | 1979-04-19 | 1980-04-18 | Cartridge filter |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2915819A1 (en) |
| GB (1) | GB2046613B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544387A (en) * | 1983-09-21 | 1985-10-01 | Agerlid Charles G | Outer to inner flow vacuum filter with see through outer enclosure |
| EP0424933A2 (en) * | 1989-10-27 | 1991-05-02 | Pall Corporation | Filter device |
| EP1401556A1 (en) * | 2001-05-23 | 2004-03-31 | Moshe Gershenson | Filter element assembly |
| EP1764143A1 (en) * | 2005-09-16 | 2007-03-21 | Mann+Hummel Gmbh | Filter element for liquids |
| CN108778462A (en) * | 2016-02-10 | 2018-11-09 | 气体专用设备联合公司 | The nested filter used in unit is condensed in mist |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2015012995A (en) * | 2013-03-15 | 2015-12-01 | Mann & Hummel Purolator Filters Llc | Spherical contact ball joint style spool relief valve. |
| WO2015187665A2 (en) | 2014-06-03 | 2015-12-10 | Donaldson Company, Inc. | Filter arrangement with support core and methods |
| CN108688126B (en) * | 2018-03-30 | 2023-09-08 | 郑州德奥科技有限公司 | Drum-type large-area non-fluctuation melt filter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1611051A1 (en) * | 1966-12-23 | 1970-10-08 | Bosch Gmbh Robert | Liquid filter |
| DE1801161C3 (en) * | 1968-10-04 | 1981-05-21 | Purolator Filter GmbH, 7110 Öhringen | Filters, in particular for internal combustion engines in motor vehicles |
| GB1473853A (en) * | 1974-02-16 | 1977-05-18 | Domnick Hunter Eng | Filters |
-
1979
- 1979-04-19 DE DE19792915819 patent/DE2915819A1/en not_active Ceased
-
1980
- 1980-04-18 GB GB8012834A patent/GB2046613B/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544387A (en) * | 1983-09-21 | 1985-10-01 | Agerlid Charles G | Outer to inner flow vacuum filter with see through outer enclosure |
| EP0424933A2 (en) * | 1989-10-27 | 1991-05-02 | Pall Corporation | Filter device |
| EP0424933A3 (en) * | 1989-10-27 | 1991-08-14 | Pall Corporation | Filter device |
| US5152890A (en) * | 1989-10-27 | 1992-10-06 | Pall Corporation | Filter device |
| EP1401556A1 (en) * | 2001-05-23 | 2004-03-31 | Moshe Gershenson | Filter element assembly |
| EP1401556A4 (en) * | 2001-05-23 | 2004-12-08 | Moshe Gershenson | Filter element assembly |
| EP1764143A1 (en) * | 2005-09-16 | 2007-03-21 | Mann+Hummel Gmbh | Filter element for liquids |
| US7635429B2 (en) | 2005-09-16 | 2009-12-22 | Mann + Hummel Gmbh | Fluid filter element |
| CN108778462A (en) * | 2016-02-10 | 2018-11-09 | 气体专用设备联合公司 | The nested filter used in unit is condensed in mist |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2915819A1 (en) | 1980-11-06 |
| GB2046613B (en) | 1983-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960418 |