GB1604833A - Filtration of fluids - Google Patents
Filtration of fluids Download PDFInfo
- Publication number
- GB1604833A GB1604833A GB24888/78A GB2488878A GB1604833A GB 1604833 A GB1604833 A GB 1604833A GB 24888/78 A GB24888/78 A GB 24888/78A GB 2488878 A GB2488878 A GB 2488878A GB 1604833 A GB1604833 A GB 1604833A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- fluid
- shank
- filtered
- filter element
- 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
Links
- 239000012530 fluid Substances 0.000 title claims description 73
- 238000001914 filtration Methods 0.000 title claims description 24
- 238000007789 sealing Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 239000002775 capsule Substances 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 241000220010 Rhode Species 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 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
- B01D29/114—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 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
- 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
- B01D29/56—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 series connection
- B01D29/58—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 series connection arranged concentrically or coaxially
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Filtration Of Liquid (AREA)
Description
(54) FILTRATION OF FLUIDS
(71) We, FRAM CORPORATION, a corporation organised and existing under the laws of the State of Delaware, United States of America, of 105, Pawtucket Avenue,
East Providence, Rhode Island, United
States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The invention relates to the filtration of fluids. More particularly, but by no means exclusively, the invention relates to oil filtration, for example in motor vehicles.
Replaceable filter elements of the "outside-in" flow type are well known and usually comprise a body of filter material retained in an annular cylindrical configuration by means of inner and outer cylindrical sleeves and axial end caps. The inner and outer sleeves are usually perforated. For oil filtration, the filter material will usually comprise a quantity of fibrous filter medium.
In one form of filter commonly encountered, and known as a filter of the "bowland-bolt" type, a replaceable filter element of the above described type is retained in proper location with a generally cylindrical filter casing having a closed bowl-shaped end by means of a retainer seat biased by a spring away from the bowl-shaped closed end which urges the filter element axially towards and against a filter mounting casting provided with inlet and outlet passages for flow of fluid to and from the filter. The filter casing is mounted to the filter mounting casting by means of a bolt which extends axially through the casing. retainer seat and filter element and into a female socket in the casting.
The filter is usually adapted for full-flow filtration. In other words, the entire fluid flow from inlet to outlet is caused to pass through the filter element. In so-called "parallelflow" filtration, two filter elements, usually employing different filter material, are mounted, usually in axial alignment, within the same filter casing. The arrangement is such that at the commencement of use of the filter, the major part of the fluid flow is through one of the filter elements, the other element only passing a minor proportion of the fluid. As the first filter becomes clogged with dirt extracted from the fluid, an increasingly greater proportion of the fluid flow is caused to pass through the other filter.
This parallel-flow arrangement is not considered very advantageous because in order for the pressure drop across the filter as a whole not to become unacceptably high in the second stage of utility of the filter, either the second filter element has to be such as to allow a substantial proportion of dirt to pass therethrough unfiltered, or alternatively, a by-pass valving arrangement has to be incorporated to ensure that a proportion of unfiltered fluid is enabled to by-pass the filter elements and to pass directly from inlet to outlet.
It has long been appreciated that a reduction in engine wear would result if a by-pass filter could be employed in addition to the normal full-flow filtration of engine oil, but until now there has been no entirely satisfactory way in which this could be conveniently accomplished. We have sought to devise embodiments of filter in convenient and practical forms capable of obtaining this advantage. As we shall explain, in our embodiments, in addition to the usual fullflow filtration, we abstract a proportion of the oil flow, filter it in a by-pass element and pass it directly to the sump. It should, however, be understood that the utility of our embodiments is not restricted to the filtration of oil.
In accordance with a first aspect of this invention, we provide an interchangeable and replaceable filter cartridge for a fluid filtering apparatus of the bowl-and-bolt type which comprises: a filter mounting provided with an inlet port for fluid to be filtered, and first and second outlet ports for passing filtered fluid to respective first and second destinations; a generally cylindrical casing open at one end, the other end being generally bowl-shaped and having a central aperture on the axial centre line of the casing but being otherwise closed; a bolt coupling the casing to the mounting, being received through said central aperture with its shank extending along said axial centre line and its shank end threadedly engaged in the mounting, the shank having at least one aperture in the side thereof communicating with a passage in said shank extending from said aperture and opening at said shank end into said mounting, and the mounting providing passage between said shank end and the second outlet port; which interchangeable and replaceable filter cartridge comprises, within a one-piece outer cylindrical sleeve, first and second annular filter elements each comprising an external cylindrical sleeve and filter material disposed between opposed axial end caps, the said one-piece outer cylindrical sleeve serving as the external cylindrical sleeve for at least one said element, the interchangeable and replaceable filter cartridge being adapted to be mounted within the casing with the bolt extending through the central spaces of both said elements and defining a generally cylindrical space intermediate one said element and the shank and bounded in opposite axial directions by respective sealing means carried by said interchangeable and replaceable filter cartridge and adapted for sealing engagement with said shank, such that in operation of the filtering apparatus one said outlet port is arranged to receive via said shank aperture and said shank passage fluid from said generally cylindrical space which has been filtered by said one filter element, and the other said outlet port is arranged to receive fluid which has been filtered by the other said filter element.
According to a second and alternative aspect of this invention, there is provided apparatus of the bowl-and-bolt type for filtering fluids, comprising: a filter mounting provided with an inlet port for fluid to be filtered, and first and second outlet ports for passing filtered fluid to respective first and second destinations; a generally cylindrical casing open at one end, the other end being generally bowl-shaped and having a central aperture on the axial centre line of the casing but being otherwise closed; a bolt coupling the casing to the mounting, being received through said central aperture with its shank extending along said axial centre line and its shank end threadedly engaged in the mounting, the shank having at least one aperture in the side thereof communicating with a passage in said shank extending from said aperture and opening at said shank end into said mounting, and the mounting providing passage between said shank end and the second outlet port; and filter means in the form of an interchangeable and replaceable filter cartridge of generally cylindrical configuration, comprising, within a one-piece outer cylindrical sleeve, first and second annular filter elements each comprising an external cylindrical sleeve and filter material disposed between opposed axial end caps, the said one-piece outer cylindrical sleeve serving as the external cylindrical sleeve for at least one said element, the filter means being mounted within the casing, with the bolt extending through the central spaces of both said elements and defining a generally cylindrical space intermediate one said element and the shank and bounded in opposite axial directions by respective sealing means carried by said filter means and sealingly engaged with said shank, such that in operation one said outlet port is arranged to receive via said shank aperture and shank passage fluid from said generally cylindrical space which has been filtered by said one filter element and the other said outlet port is arranged to receive fluid which has been filtered by the other said filter element.
In one arrangement the second filter element is caused to operate in parallel with the first filter element (that is: it is caused to filter dirty fluid); while in an alternative arrangement the second filter element is caused to operate in tandem with the first filter element (that is: it receives a proportion of the fluid which has already been filtered by passage through the first filter element and further filters that fluid before allowing it to pass to the second destination).
Various arrangements are possible within the general scope of this invention, and several arrangements are described in detail hereinafter.
The invention is hereinafter more particularly described by way of example only with reference to the accompanying drawings, in which:
Fig. 1 shows an axial sectional view of a first embodiment of filter constructed in accordance with this invention;
Fig. 2 shows a similar axial sectional view of a second embodiment of filter also constructed in accordance with this invention;
Fig. 3 shows an axial sectional view of one half of a further embodiment of filter in accordance with the invention, the other half being similar; and
Fig. 4 shows a further embodiment of filter in accordance with this invention in axial section.
The filtering apparatus generally indicated 1 in Fig. 1 is of the bowl-and-bolt type comprising a generally cylindrical casing 2 which is generally bowl-shaped at one end 3 and open at the other end 4. The bowlshaped end 3 has a central aperture 5 on the axial centre line of the casing but is otherwise closed. A bolt 6 is received through the central aperture 5 with its shank 7 extending along the axial centre line and its shank end 8 threadedly and releasably engaged in a filter mounting generally indicated 9.
The co-operating filter mounting casting 9 has an inlet passage 10 and first and second outlet passages 11 and 12. The inlet passage 10 and the first outlet passage 11 would be coupled into the engine oil circuit in the usual way, whereas the second outlet passage 12 would in use be coupled directly to the sump. The casing 2 is fitted to the mounting 9 by means of the bolt 6, the periphery of the casing at its open end 4 being received together with a sealing ring 13 in a groove 14 of the mounting.
An interchangeable and replaceable filter cartridge generally indicated 15 is mounted within casing 2. Filter cartridge 15 comprises, within a one-piece outer cylindrical sleeve 16, first and second filter element 17 and 18.
The two filter elements 17, 18 are annular cylindrical in configuration, having their respective filter media 1 7a, 1 8a disposed between opposed annular axial end caps 17b, 17c and 18b, 18c respectively. Each filter medium may consist of a body of fibrous filter medium or of a pleated paper annulus in accordance with the usual practice in this art. However, we prefer to use. at least for the filter element 18, a fibrous filter medium. It will be seen that the one-piece outer cylindrical sleeve 16 serves as the external cylindrical sleeve for both element 17 and 18.
The shank 7 of the bolt 6 is formed as a tube or otherwise provided with an axial passage for receiving fluid filtered by the second filter element 18 and with apertures 19. The distal end of bolt 6 opens out into a passage 20 which provides a second outlet passage in filter mounting casting 9. Second filter element 18 may operate truly in parallel with first filter element 17 or in tandem with the first filter element so far as the by-pass flow is concerned depending upon whether the external cylindrical shell 16 in the region of filter element 18 or the end cap l8b and partition 21 is perforated.
The embodiment of Fig. 2 is generally similar to that of Fig. I and like reference numerals are used for like parts. The major difference between the two embodiments is that in the Fig. 2 arrangement. the one-piece outer cylindrical sleeve is not perforated in the region of second filter element 18. element 18 receiving through partition 21 fluid whih has already been filtered by the first filter element 17.
In both Fig. I and Fig. 2 arrangements, first and second annular seals 22 are carried by partition 21 and a radially inner extension 23 of end cap 18c. The seals 22 sealingly engage the shank 7 of bolt 6 so as to define a generally cylindrical space 24 intermediate second element 18 and the shank 7, the chamber so defined receiving fluid filtered by element 18, the fluid discharging from this space 24 via apertures 19.
The embodiments described hereinabove may be unacceptable for certain applications since if the filter is intended to replace an equivalent filter with substantially the same full-flow filtration capability, the addition of the second filter element for by-pass flow (whether true parallel or partial tandem) will in general add to the axial extent of the filter.
Usually this will not matter greatly, but for engine compartments in which space is at a premium we have devised two further arrangement (Figs. 3 and 4), in which the filter elements are accommodated in the axial space which would normally be required for the equivalent full-flow filter element itself.
In Fig. 3, in which like reference numerals to Figs. 1 and 2 are employed for like parts-but with the addition lO(so that filter element 117 of Fig. 3 is equivalent to filter element 17 of Fig. 1, the second filter element 118 is mounted coaxially within first filter element 117. The opposed axial end caps 11 8b and 11 8c of filter element 118 form part of a plastics housing or capsule 25. Fluid to be filtered by element 118 in the true parallel flow variant passes into the filter element via perforations 26 in end cap 118c; and in the partial tandem flow variant via perforations 26a in its external cylindrical shell. Filtered fluid passes out of element 118 via perforations on its inner cylindrical shell and thereafter via apertures 119 into the interior of bolt 101. A frusto conical extension piece 25a joined to or integral with housing or capsule 25 with a seal 25b at its inner periphery co-operating with bolt 106 separates the fluid at the outlet side of filter elements 117, 118 for passage to the respective destinations. As illustrated in Fig. 6, the element 118 tapers slightly from one axial end to the other but still has a configuration which is generally cylindrical.
It will be seen that in this arrangement, also, the filter means is of generally cylindrical external configuration having a one-piece outer cylindrical sleeve, here provided by the external shell of element 117.
A generally cylindrical space 27 bounded in opposite axial directions by seal 25b and by end cap 118c and associated ring 28 is defined between element 118 and bolt 106.
Fluid filtered by element 118 and issuing into this space passes via apertures 119 into the interior of shank 107.
We consider the arrangement of Fig. 4 to be particularly advantageous since it pro vides for by-pass flow without adding to the axial extent of the filter and also without greatly adding to the difficulties of fabrication. The reference numerals used correspond in general to those used in Figs. 1 and 2, but with the addition of 200. Thus, filter element 217 of Fig. 7 is generally equivalent to element 17 of Fig. 2. The filter means of
Fig. 4 is of generally cylindrical external configuration and has a one-piece outer cylindrical sleeve 216, being the outer perforated sleeve of element 217. A portion of the fluid filtered by element 217 passes through apertures 29 in a plate 30 (which may be formed integrally with end cap 217h) and which carries an annular sealing ring 30a which seals incoming fluid in passage 210 from outgoing fluid in passage 211 which has been filtered by element 217. The other end of element 217 is supported on an end locating plate 3 via an intermediate sealing ring 32 which is carried by a plate 33 which corresponds to plate 30 at the opposite axial end of element 217 and is suitably formed integrally with end cap 217c. The end locating plate 31 is biased away from the closed bowl end by the compression spring provided about the bolt. Part of the fluid already filtered by element 217 is further filtered in element 218 (also by outside-in flow) and then passes via aperture 219 into the interior of shank 207 of bolt 206 and thence to outlet passage 220. The end caps 218b and 21 sic of element 218 each carry a seal 34. A cylindrical space 35 is defined between element 118 and bolt 206 bounded by seals 34. It will be noted that element 218 is not fixed to any other parts but is freely slidingly received on shank 207 via its seals 34. This greatly aids fabrication since element 218 does not require precise location, but may simply be inserted within the central axial space of element 217 during assembly of the parts.
We have found that the use of a one-piece outer cylindrical sleeve confers advantages.
In the case where one filter element is coaxially mounted within the other so that the perforated external sleeve of the outer such element serves as the said one-piece outer cylindrical sleeve, the advantage of reduced overall axial extent of the filter is secured. By providing the inner such element with seals at or adjacent its axial ends for sealing engagement with the shank of the bolt, separation of the filtered fluid to the two destinations can be ensured within the space where a conventional full flow filter would otherwise have been used. Alternatively, when the two elements are axially aligned and formed together as a unitary filter media cartridge, we obtain the advantage of ease of assembly-only one part rather than two needs to be incorporated into the filter during fabrication or assembly. The provision of seals at opposed axial ends of one of the filter elements so as to define a cylindrical space between that element and the shank in use reduces the likelihood of mistakes in assembly of the filter as by inserting the combined filter cartridge into the filter casing in an inverted configuration. Additionally, by providing the two elements in the form of a unified cartridge, the possibility of inserting the elements into the filter in the wrong order is also avoided.
The reader is also directed to the specifications of three related applications. The present application has been divided from Application 77()5/77 (Serial No. ifs04831). Patent Application 24887/78 (Serial No.
1604832) was similarly divided from Application 7705/77. Patent Application No.
8102598 (Serial No. 1604834) has been divided from the specification of this present application.
WHAT WE CLAIM IS: 1. An interchangeable and replaceable filter cartridge for a fluid filtering apparatus of the bowl-and-bolt type which comprises: a filter mounting provided with an inlet port for fluid to be filtered, and first and second outlet ports for passing filtered fluid to respective first and second destinations; a generally cylindrical casing open at one end, the other end being generally bowl-shaped and having a central aperture on the axial centre line of the casing but being otherwise closed; a bolt coupling the casing to the mounting, being received through said central aperture with its shank extending along said axial centre line and its shank end threadedly engaged in the mounting, the shank having at least one aperture in the side thereof communicating with a passage in said shank extending from said aperture and opening at said shank end into said mount ipg, and the mounting providing passage between said shank end and the second outlet port; which interchangeable and replaceable filter cartridge comprises, within a one-piece outer cylindrical sleeve, first and second annular filter elements each comprising an external cylindrical sleeve and filter material disposed between opposed axial end caps, the said one-piece outer cylindrical sleeve serving as the external cylindrical sleeve for at least one said element, the interchangeable and replaceable filter cartridge being adapted to be mounted within the casing with the bolt extending through the central spaces of both said elements and defining a generally cylindrical space intermediate one said element and the shank and bounded in opposite axial directions by respective sealing means carried by said interchangeable and replaceable filter cartridge and adapted for sealing engagement with said shank, such that in operation of the filtering apparatus one said outlet port is
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (16)
- **WARNING** start of CLMS field may overlap end of DESC **.vides for by-pass flow without adding to the axial extent of the filter and also without greatly adding to the difficulties of fabrication. The reference numerals used correspond in general to those used in Figs. 1 and 2, but with the addition of 200. Thus, filter element 217 of Fig. 7 is generally equivalent to element 17 of Fig. 2. The filter means of Fig. 4 is of generally cylindrical external configuration and has a one-piece outer cylindrical sleeve 216, being the outer perforated sleeve of element 217. A portion of the fluid filtered by element 217 passes through apertures 29 in a plate 30 (which may be formed integrally with end cap 217h) and which carries an annular sealing ring 30a which seals incoming fluid in passage 210 from outgoing fluid in passage 211 which has been filtered by element 217. The other end of element 217 is supported on an end locating plate 3 via an intermediate sealing ring 32 which is carried by a plate 33 which corresponds to plate 30 at the opposite axial end of element 217 and is suitably formed integrally with end cap 217c. The end locating plate 31 is biased away from the closed bowl end by the compression spring provided about the bolt. Part of the fluid already filtered by element 217 is further filtered in element 218 (also by outside-in flow) and then passes via aperture 219 into the interior of shank 207 of bolt 206 and thence to outlet passage 220. The end caps 218b and 21 sic of element 218 each carry a seal 34. A cylindrical space 35 is defined between element 118 and bolt 206 bounded by seals 34. It will be noted that element 218 is not fixed to any other parts but is freely slidingly received on shank 207 via its seals 34. This greatly aids fabrication since element 218 does not require precise location, but may simply be inserted within the central axial space of element 217 during assembly of the parts.We have found that the use of a one-piece outer cylindrical sleeve confers advantages.In the case where one filter element is coaxially mounted within the other so that the perforated external sleeve of the outer such element serves as the said one-piece outer cylindrical sleeve, the advantage of reduced overall axial extent of the filter is secured. By providing the inner such element with seals at or adjacent its axial ends for sealing engagement with the shank of the bolt, separation of the filtered fluid to the two destinations can be ensured within the space where a conventional full flow filter would otherwise have been used. Alternatively, when the two elements are axially aligned and formed together as a unitary filter media cartridge, we obtain the advantage of ease of assembly-only one part rather than two needs to be incorporated into the filter during fabrication or assembly. The provision of seals at opposed axial ends of one of the filter elements so as to define a cylindrical space between that element and the shank in use reduces the likelihood of mistakes in assembly of the filter as by inserting the combined filter cartridge into the filter casing in an inverted configuration. Additionally, by providing the two elements in the form of a unified cartridge, the possibility of inserting the elements into the filter in the wrong order is also avoided.The reader is also directed to the specifications of three related applications. The present application has been divided from Application 77()5/77 (Serial No. ifs04831). Patent Application 24887/78 (Serial No.1604832) was similarly divided from Application 7705/77. Patent Application No.8102598 (Serial No. 1604834) has been divided from the specification of this present application.WHAT WE CLAIM IS: 1. An interchangeable and replaceable filter cartridge for a fluid filtering apparatus of the bowl-and-bolt type which comprises: a filter mounting provided with an inlet port for fluid to be filtered, and first and second outlet ports for passing filtered fluid to respective first and second destinations; a generally cylindrical casing open at one end, the other end being generally bowl-shaped and having a central aperture on the axial centre line of the casing but being otherwise closed; a bolt coupling the casing to the mounting, being received through said central aperture with its shank extending along said axial centre line and its shank end threadedly engaged in the mounting, the shank having at least one aperture in the side thereof communicating with a passage in said shank extending from said aperture and opening at said shank end into said mount ipg, and the mounting providing passage between said shank end and the second outlet port; which interchangeable and replaceable filter cartridge comprises, within a one-piece outer cylindrical sleeve, first and second annular filter elements each comprising an external cylindrical sleeve and filter material disposed between opposed axial end caps, the said one-piece outer cylindrical sleeve serving as the external cylindrical sleeve for at least one said element, the interchangeable and replaceable filter cartridge being adapted to be mounted within the casing with the bolt extending through the central spaces of both said elements and defining a generally cylindrical space intermediate one said element and the shank and bounded in opposite axial directions by respective sealing means carried by said interchangeable and replaceable filter cartridge and adapted for sealing engagement with said shank, such that in operation of the filtering apparatus one said outlet port isarranged to receive via said shank aperture and said shank passage fluid from said generally cylindrical space which has been filtered by said one filter element, and the other said outlet port is arranged to receive fluid which has been filtered by the other said filter element.
- 2. A filter cartridge according to Claim 1, wherein said one filter element is coaxially mounted within the other, which other filter element has a perforated external cylindrical sleeve for the ingress thereto of fluid to be filtered, which sleeve constitutes the said onepiece outer cylindrical sleeve.
- 3. A filter cartridge according to Claim 1, having opposed external end caps at its opposite axial ends and an intermediate internal annular partition mounting one said sealing means, filter material for said one filter element being contained between one said external end cap and the internal partition, and filter material for the other said filter element being cotained between the other said external end cap and the internal partition.
- 4. A filter cartridge according to any preceding Claim, wherein the filter elements are adapted to operate in parallel with each other, each filter element being adapted to receive in use of the filtering apparatus a portion of the incoming unfiltered fluid, separately to filter the respective fluid portion for its respective destination.
- 5. A filter cartridge according to Claim 4 as appendant to Claim 2, wherein an axial end of the one said filter element is apertured to provide in use access for unfiltered fluid to be filtered by the said element. and wherein the other said filter element is arranged to operate by outside-in flow.
- 6. A filter cartridge according to any of Claims 1, 2 or 3, wherein said one filter element is arranged to operate in tandem with the other, the said one filter element being arranged in use to receive and filter a portion only of fluid already filtered by the said other filter element and to pass such fluid to its respective destination.
- 7. A filter cartridge according to Claim 6 as appendent to Claim 3. wherein the external cylindrical sleeve is perforated only in the region of the said other filter element for ingress of fluid to be filtered thereby: and wherein the internal annular partition is apertured to allow passage from said other to said one filter element of said portion of fluid in use.
- 8. Apparatus of the bowl-and-bolt type for filtering fluids, comprising: a filter mounting provided with an inlet port for fluid to be filtered, and first and second outlet ports for passing filtered fluid to respective first and second destinations: a generally cylindrical casing open at one end, the other end being generally bowl-shaped and having a central aperture on the axial centre line of the casing but being otherwise closed; a bolt coupling the casing to the mounting, being received through said central aperture with its shank extending along said axial centre line and its shank end threadedly engaged in the mounting, the shank having at least one aperture in the side thereof communicating with a passage in said shank extending from said aperture and opening at said shank end into said mounting, and the mounting providing passage between said shank end and the second outlet port; and filter means in the form of an interchangeable and replaceable filter cartridge of generally cylindrical configuration, comprising, within a one-piece outer cylindrical sleeve, first and second annular filter elements each comprising an external cylindrical sleeve and filter material disposed between opposed axial end caps, the said one-piece outer cylindrical sleeve serving as the external cylindrical sleeve for at least one said element, the filter means being mounted within the casing, with the bolt extending through the central spaces of both said elements and defining a generally cylindrical space intermediate one said element and the shank and bounded in opposite axial directions by respective sealing means carried by said filter means and sealingly engaged with said shank, such that in operation one said outlet port is arranged to receive via said shank aperture and shank passage fluid from said generally cylindrical space which has been filtered by said one filter element and the other said outlet port is arranged to receive fluid which has been filtered by the other said filter element.
- 9. Apparatus according to Claim 8, wherein said one filter element is coaxially mounted within the other, which other filter element has a perforated external cylindrical sleeve for the ingress thereto of fluid to be filtered, which sleeve constitutes the said onepiece outer cylindrical sleeve.
- 10. Apparatus according to Claim 8, having opposed external end caps at its opposite axial ends and an intermediate internal annular partition maintaining one said sealing means, filter material for said one filter element being contained between one said external end cap and the internal partition, and filter material for the other said filter element being contained between the other said external end cap and the internal partition.
- I 1. Apparatus according to any one of Claims 8, 9 or 10, wherein the filter elements are arranged to operate in parallel with each other, each filter element receiving a portion of the incoming unfiltered fluid and separately filtering the respective fluid portion which is then arranged to pass to its respective destination.
- 12. Apparatus according to Claim 11 as appendent to Claim 9, wherein an axial end of the one said filter element is apertured to provide access for unfiltered fluid to be filtered by the said element. and whein the other said filter element is arranged to operate by outside-in flow.
- 13. Apparatus according to any of Claims 8, 9 or 10, wherein said one filter element is arranged to operate in tandem with the other, the said one filter element being arranged to receive and filter a portion only of fluid already filtered by the said other filter element, the remainder of the fluid filtered by the said other filter element being arranged to pass to its respective destination, while the fluid filtered by the said one filter element is arranged to pass to its respective destination.
- 14. Apparatus according to Claim 13 as appendent to Claim 10, wherein the external cylindrical sleeve is perforated only in the region of the said other filter element for ingress of fluid to be filtered thereby; and wherein the internal annular partition is apertured to allow passage from said other to said one filter element of said portion of fluid.
- 15. For a fluid filtering apparatus of the bowl-and-bolt type, an interchangeable and replaceable filter cartridge substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
- 16. Apparatus of the bowl-and-bolt type for filtering fluids, substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB24888/78A GB1604833A (en) | 1978-05-31 | 1978-05-31 | Filtration of fluids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB24888/78A GB1604833A (en) | 1978-05-31 | 1978-05-31 | Filtration of fluids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1604833A true GB1604833A (en) | 1981-12-16 |
Family
ID=10218843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24888/78A Expired GB1604833A (en) | 1978-05-31 | 1978-05-31 | Filtration of fluids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1604833A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4738776A (en) * | 1986-05-23 | 1988-04-19 | Cummins Engine Company, Inc. | Lubricant filter assembly |
| GB2210288A (en) * | 1987-10-01 | 1989-06-07 | Pall Europ | Coalescer filter unit |
| GB2222534A (en) * | 1988-09-09 | 1990-03-14 | Process Scient Innovations | Filter assembly |
| EP2930152A4 (en) * | 2012-12-04 | 2016-02-24 | Coway Co Ltd | Water treatment apparatus |
| WO2022213309A1 (en) * | 2021-04-08 | 2022-10-13 | 3M Innovative Properties Company | Filter cartridge and filter having same |
-
1978
- 1978-05-31 GB GB24888/78A patent/GB1604833A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4738776A (en) * | 1986-05-23 | 1988-04-19 | Cummins Engine Company, Inc. | Lubricant filter assembly |
| GB2210288A (en) * | 1987-10-01 | 1989-06-07 | Pall Europ | Coalescer filter unit |
| GB2222534A (en) * | 1988-09-09 | 1990-03-14 | Process Scient Innovations | Filter assembly |
| US5114572A (en) * | 1988-09-09 | 1992-05-19 | Process Scientific Innovations Limited | Filter assembly and cartridge therefor |
| GB2222534B (en) * | 1988-09-09 | 1992-11-25 | Process Scient Innovations | Filter assembly and cartridge therefor |
| EP2930152A4 (en) * | 2012-12-04 | 2016-02-24 | Coway Co Ltd | Water treatment apparatus |
| US9725347B2 (en) | 2012-12-04 | 2017-08-08 | Coway Co., Ltd. | Water treatment apparatus |
| WO2022213309A1 (en) * | 2021-04-08 | 2022-10-13 | 3M Innovative Properties Company | Filter cartridge and filter having same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5078877A (en) | Dual flow and dual stage lubricant filter assembly | |
| US5405527A (en) | Anti-drainback/pressure-relieved filter cartridges for lubricating oil | |
| US7494017B2 (en) | Filter element with off-axis end cap | |
| EP1658121B1 (en) | Filter assembly with vented filter element | |
| US6571962B2 (en) | Cartridge filter element with housing seal retainer | |
| JP5283776B2 (en) | Filter cartridge housing mounting system | |
| US5180490A (en) | Lubricant filter assembly with internal bypass lock-out | |
| US5104537A (en) | High pressure hydraulic spin-on filter | |
| US6585892B2 (en) | Concentrically-arranged flexible media and support basket with second stage cartridge filter | |
| US5342511A (en) | Oil filter with inner and outer coaxial filter elements | |
| JP2003525732A (en) | Regeneration and filter assembly with replaceable cartridge | |
| JPS61502523A (en) | Filters with flow reversal end caps to accommodate flow reversal | |
| EP0889229B1 (en) | Reverse flow filter cartridge and method of filtering fuel | |
| US5006235A (en) | Barrier flange filter assembly including cover | |
| US11890558B2 (en) | Filter system comprising a filter element and secondary element for closing a central tube | |
| JPH05504908A (en) | Powerful air filter with multi-purpose end seal | |
| KR960001378B1 (en) | Oil filter | |
| MXPA03008444A (en) | Hybrid spin-on filter. | |
| GB1604832A (en) | Apparatus for filtering fluids | |
| US3690460A (en) | Relief valve for oil filters or the like | |
| US3543935A (en) | Combination full flow,slow flow oil filter | |
| US3315809A (en) | Filter unit with by-pass and anti-drain back valve | |
| GB1604833A (en) | Filtration of fluids | |
| US3388802A (en) | Filter element support means | |
| US5679244A (en) | Spin-on liquid filter with unique straight through flow path |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |