CA1229312A

CA1229312A - Convertible liquid filter

Info

Publication number: CA1229312A
Application number: CA000440316A
Authority: CA
Inventors: Howard W. Morgan, Jr.; Ronald L. Hartog
Original assignee: Filter Specialists Inc
Current assignee: Pall Filter Specialists Inc
Priority date: 1983-03-09
Filing date: 1983-11-02
Publication date: 1987-11-17
Also published as: IT1213001B; JPS59154111A; FR2542213B1; GB8328196D0; IT8368262A0; JPH0366925B2; GB2136305B; GB2136305A; NL8304166A; DE3343881A1; FR2542213A1

Abstract

CONVERTIBLE LIQUID FILTER

Abstract of the Disclosure An insert carrying cartridge filtering element for use in converting a liquid filter from a bag-type filter where fluid entering the filter flows into a bag and is strained through the bag to a cartridge-type filter where fluid entering the filter passes through the cartridge filtering element and exits the filter.

Description

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CONVE~RTI13LE LIQUID FILTER

Summary of the Invention This invention relates to a liquid filter having an insert which converts the filter from a bag type to a cartridge-type.
The present filter art includes both Bogota filters and cartridge-type filters. The bag-type filters are illustrated in U. S. Patents ~,259,1S8 and 3,~14,261. The cartridge-type filters are shown and described in U. S. Patents 3,319,793 and 3,050,193.
However, there is no known device in the filter art providing for the use of a single filter housing which accommodates both a filter bag or a filter cartridge without the necessity of reversing liquid flow through the filter.
It is a purpose of -this invention to provide a cartridge-carrying insert which is adapted to be fitted within an existing housing for a filter bag. There are two illustrated embodiments of the invention.
The first such embodiment includes a ring which is carried within the filter housing so as not to interfere with the use of a filter bag in the housing.
To convert the filter from a bag to a cartridge-type, the bag its removed and a base plate which carries one or more cartridges is secured to the housing ring.
The second such embodiment of the filter includes a liquid impervious busiest having a generally cylindrical side wall and a bottom wall. The basket bottom wall supports at least one cartridge carried over a filter outlet. To convert the filter from a bag to a ~Z~3~

cartridge-type, the bag is removed and the basket fitted into the filter hoosegow in a supported relationship under the filter inlet.
Accordingly, it is an object of this invention to provide a novel and useful liquid filter which can be converted between bag and cartridge usage.
Another object of the invention is lo provide a liquid filter which may be used with either filtering bags or filtering cartridges without changing direction or diverting liquid flow through the filter.
Another object of the invention is a filter which may be converted from use with a filter bag to use with a filter cartridge in a simple and rapid manner.
Other objects of this invention will become apparent upon a further reading of the description.

Description of the Drawings Ego. 1 is a longitudinal sectional view of one embodiment of the filter shown accommodating a filter bag.
Fig. 2 is a longitudinal sectional view of the housing of the filter offing 1 shown accommodating several filtering cartridges and taken along line 2-2 of Ego. 4 with one cartridge and its supporting post having portions broken away for illustrative purposes.
Fig. 3 is a horizontal sectional view taken along line 3-3 of Fig. 1.
Fig. 4 is a horizontal sectional view taken along line 4-4 of Fig. 2.

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;~2~:93~2 Fig. 5 shows a filter cartridge and its supporting post in detail with portions broken away to illustrate its construction.
Fig. 6 is a perspective view of the filter cartridge insert of the filter of Fig. 1.
Fig. 7 is a longitudinal sectional view of a second embodiment of the filter shown accommodating a filter bag-Fig. is a longitudinal sectional view of the housing of the filter of Fig. 7 shown accommodating several filtering cartridges and taken along line I
of Fig. 10 with one cartridge and its supporting post having portions broken away for illustrative purposes.
Fig. 9 is a perspective view of the filter cartridge insert used in the filter of Fig. with portions broken away for purposes of illustration.
Fig. 10 is a horizontal sectional view taken along line 10-10 of Fig. I.

Description of the Preferred Embodiments -The preferred embodiments illustrated are not intended to be exhaustive or to limit the invention to the precise forms disclosed. They are chosen and described in order to best explain the principles of the invention and its application and practical use to thereby enable others skilled in the art to utilize the nventlon .
A first embodiment of the filter is shown in Figs.
1-6 of the drawings. Filter 10 includes a housing 12 having a side wall 14 and a bottom wall 16 which 3~2 defines a chamber. E-lousing 12 includes an inlet port 18 and an outlet port 20. Inlet port 18 is located adjacent to an upper edge 22 of side wall 14. Side wall 14 of housing 12 is of a double walled construction adjacent to inlet port 18 having an inwardly offset wall part 24 which is joined with the exterior part of side wall 14 on both sides and just below the port. A shoulder 26 is formed in wall part 24 and is circularly continuous with a shoulder 28 10 formed in the exterior part of housing side wall 12. A
reticulated basket 30 is suspended within housing 12 by its outturned flange 32 which rests on housing shoulders 26, 28 adjacent the upper end of the housing.
A filtering bag 34 fits within basket 30 and is supported at its upper margin 3B by shoulders 26,28 of housing 12 and over basket flange 32. A cover 40 fits upon housing upper edge 22 and, when secured to the housing by hold down nuts 41 (only one shown), makes peripheral sealing engagement with an 0-ring 42 seated 20 in a peripheral groove 44 in the upper edge of housing side wall 14. Cover 40 includes an upwardly offset portion 46 which is located over offset wall part 24 of housing side wall 14 and which, in conjunction with the wall part, forms a passage 48 from inlet port let upwardly over the upper margin 38 of bag 34 and into the interior of the bag. This construction is more fully described an explained in U. S. Patent No.
3,~314,261.
adaptation of filter 10 to use with a cartridge-30 type filter insert 52 includes the peripheral, liquid ~Z93~2 sealing Sacramento of a ring 54 at its circumferential edge to housing side wall I adjacent bottom wall 16.
Ring 54 is positioned so that basket 30 will preferably not contact the ring when filter 10 is used as a bag-type filter. Securernent of ring 54 to housing side wall 14 is preferably by welding. Ring 54 has an annular body defining a central opening 56 and includes at least one and preferably two threaded bores I in its body. Central opening 56 allows for the passage of fluid to outlet port 20.
Filter insert 52 includes a base plate 60 having openings 62 which are alienable with ring bores I when the base plate it seated over ring 54. jolts 64 extend through plate opening 62 and are turned into ring bores 58 to secure base plate 60 to ring 54. Base plate 60 is preferably sealed against ring 54 by an 0-ring 59.
Reticulated tubular center posts 66 are supported by bate plate 60 and extend upwardly from the base plate.
Each post 66 has its central passage I aligned with an opening through base plate 60. Posts 66 are each adapted to support a replaceable filter cartridge 70 which includes a reticula-ted cylindrical frame 72 wrapped by fiber 74. Each filter cartridge may be of a variety of standard constructions. Each frame 72 slides over a post 66. A cap 76 covers the upper end of each filter cartridge 70. A helical spring I fits over each cap 76. When cover 40 is closed, caps 76 are pressed against cartridges 70 by compressed springs I
to seal the upper ends of cartridge passages I and press the cartridges against base plate 60.

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The use of filter 10 may be as a bag type filter shown in Fig. 1, or it may be converted to a cartridge type filter shown in Figs. 2-4. As a bag-type filter, liquid flow enters housing 12 through inlet I through inlet 18, passes over housing offset wall 24 and the upper margin 38 of bag 34, into the bag where it is strained on passage through the bag, and exits the housing through outlet 20, as shown by arrows 81 in Fig. 1. By lifting basket 30 and bag 34 from housing 12 and inserting filter cartridge insert 52 into the housing and bolting its base plate 60 to ring 54, filter 10 can be converted to a cartridge type filter.
Liquid flow then enters housing 12 through inlet 18 and passes over housing offset wall 24, causing at least partial filling of the housing above base plate 60 and housing ring 54. Liquid then passes through each filter cartridge 70 and openings 67 in supporting post 66, into center passage 68 of the post where it passes through insert base plate 60 to exit housing 12 through outlet 20, as shown by arrows 83 in Fig. 2.
A second embodiment of the filter is shown in Figs.
7 and 8 where an inlet 18' for the jilter 10' is in the filter cover 40'. Filter 10' includes a housing 12' having a side wall 14' and a bottom wall 16'. An outlet 20' is formed in housing bottom wall 16'. A
circular shoulder 84 is formed in the upper edge 22' of side wall 14'. A filtering bag 82 is suspended within housing 12' with the shape retaining upper margin 90 of the bag resting on shoulder 84. An 0-ring 92 is seated in a groove 94 in side wall upper edge 22' and provides ~22~3~

for peripheral sealing contact between cover 40' and the side wall upper edge. When cover 40' is fastened to housing 12', such as by tightening hold down nuts 96, bag upper margin 90 is compressed against shoulder 84.
It is to be understood that the manner in which bag 82 is sealed at its upper margin can vary from the nunnery shown. Also a basket could be utilized with bag 82 as shown in Fig. 1.
Adaptation of filter 10' for use as a cartridge-type filter is accomplished by removing bag 82 from housing 12' and inserting filter cartridge insert 98 (shown individually in jig. 9) into the housing.
Filter cartridge insert 98 includes a liquid impervious cylindrical basket 100 having a side wall 102 and a bottom wall 104. The basket side wall 102 terminates at its upper end in an outturned flange 106. When basket 100 is inserted into housing 12', basket flange 106 in compressive contact with cover 40' is supported ; by housing shoulder 84 and sealed there against by an 0-ring 105. Basket bottom wall 104 carries reticulated tubular center posts 108 which extend upwardly from the bottom wall. Each center post 108 has a central passage 110 which is aligned with an opening through gasket bottom wall 104. Each center post 108 is adapted to support a filter cartridge 111 which includes a reticulated cylindrical frame 112 wrapped with fiber 114. Each cartridge frame 112 slides over a center post 108 and is topped by a cap 116 to seal the upper end of its central passage 110. A helical spring ~2~9;~2 120 in contact with cover I presses against each cap 116 to seal and anchor the underlying cartridge.
hen in use as a bag-type filter as shown in Fig.
7, liquid, as shown by arrows 121, enters filter 10' through inlet 18' passing directly into bag I where it is filtered as it flows through the bag into housing 12'. The fluid exits housing 12' through outlet 20'.
Conversion of filter 10' from a bag-type filter to a cartridge-type filter includes removing cover 40', lifting bag I from housing 12', placing basket 100 in its place within the housing, and replacing the cover.
Liquid, as shown by arrows 123 in Fig. I, then enters jilter 10' through inlet 18' passing into basket 100 where it passes through each filter cartridge 111 and openings 109 in supporting center post 108, into center passage 110 of the post. From post center passage 110, the liquid flows through basket bottom wall 10~ and into housing 12' where it exits the housing through outlet 20'.
It is to be understood that filter cartridge insert 52 and ring 54 may be used in filter 10', shown in Fig.
7, and that filter cartridge insert I may be used in filter 10, shown in Fig. 1. Further, it is contemplated that base plate 60 shown in Fig. 6 with center posts 66 removed could be permanently attached to the filter housing below the filter bag. When it is desired to convert the filter to a cartridge-type, the bag and basket, if used, is removed and the center posts 66 screwed into threaded drain openings in base plate 60. It should also be understood that -the -3:1LZ

invention is not to be limited by the terms of the above description and may be modified within the scope of the appended claims.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A convertible liquid filter comprising in combination a filter housing and a removable cover and two optionally usable internal filtration means, said filter housing including a chamber defined by side and bottom walls and having an opened top defined by said side wall, a liquid inlet port into and a liquid outlet port from said housing chamber, said cover adapted to span said housing open top in associated sealing engagement with said housing, each of said filtration means for positioning independently of the other within said housing chamber in liquid flow communication between said inlet and outlet ports to filter the liquid flowing between the ports, one said optional filtration means including a reticulated bag element, and the other of said optional filtration means including one of a liquid impervious basket supporting a cartridge element of tubular-shaped reticulated material and a base plate supporting said cartridge element, said basket having an open top positioned between said inlet and outlet ports and having a second opening therein in flow communi-cation with said cartridge element, said base plate positioned between said inlet and outlet ports and including an opening therethrough in flow communication with said cartridge element, said base plate supported within said housing chamber by a ring carried by said filter housing, whereby liquid entering said housing chamber from said inlet port flows through said cartridge element and out either said basket or base plate opening to exit said filter housing through said outlet port.

2. The convertible filter of Claim 1 wherein said housing side wall includes a shoulder constituting means for supporting each of said bag element and basket.

3. The convertible filter of Claim 1 and including a cap fitted over said cartridge element at its upper end.

4. The convertible filter of Claim 3 and biasing means carried between said cap and said cover when the cover is in sealing engagement with said housing for pressing said cap downwardly upon said cartridge element.

5. A liquid filtering insert for converting a bag-type filter to a cartridge-type filter comprising a liquid impervious basket having a side wall and a bottom wall adapted for insertion into a filter housing in place of the bag of said bag-type filter in flow communication between the inlet and outlet of the filter, upstanding means within said basket for supporting a cartridge filtering element within the basket, said basket bottom wall having an opening, said cartridge element being supported over said basket bottom wall opening, whereby liquid entering said basket from the inlet of the filter flows through said cartridge element and said basket bottom wall opening to exit said filter housing through the filter outlet.

6. In a liquid filter having in combination a filter housing and removable cover, said filter housing including a chamber defined by side and bottom walls and having an open top defined by said side wall, means defining a liquid inlet port into and a liquid outlet port from said housing, said cover spanning said housing open top in sealing engagement with said housing, filtration means removably positioned within said housing chamber in flow communication between said inlet and outlet ports for filtering liquid flowing through said filter housing between said ports, the improvement wherein said filtration means includes a basket having a bottom wall and a side wall, said basket having an open top defined by said basket side wall, said basket bottom wall having means defining an opening therethrough, said filtration means including a cartridge element of reticulated material supported over and in liquid flow communication with said basket bottom wall opening, a support carried by one of said housing and cover positioning said basket at its open top between said inlet and outlet ports, wherein liquid after passing into said housing chamber through said inlet port flows into said basket at its open top and through said cartridge element and said basket bottom wall opening and out said housing chamber through said outlet port.

7. A liquid filtering insert for converting a bag-type filter having means defining an inlet and outlet into a cartridge-type filter comprising a basket having a side wall and a bottom wall, said basket having an open top defined by said side wall and being adapted for insertion into a filter housing in place of the filtration bag of said bag-type filter with said basket open top located between said inlet and outlet of the filter, a reticulated post carried by said basket, said basket having means defining a second opening other than said basket open top, said post having a flow passage in communication with said basket second opening, a cartridge element supported upon said post whereby liquid entering said basket through its open top from said filter inlet flows through said cartridge element and said post flow passage and said basket second opening to exit said filter housing through the filter outlet.

8. A liquid filtering insert for converting a bag-type filter to a carridge-type filter having means defining an inlet and outlet, comprising a basket having a side wall and a bottom wall, said basket having an open top defined by said side wall and being adapted for positioning in flow communication between said inlet and outlet, means defining a second opening other than said open top through said basket, a cartridge element positioned over said basket second opening, whereby liquid entering said basket from its open top flows through said cartridge element and said basket second opening to exit said filter outlet.

9. A liquid filtering insert for converting a bag-type filter having means defining an inlet and an outlet into a cartridge-type filter comprising a basket having a side wall and a bottom wall, said basket bottom wall having means defining an opening, a cartridge element positioned over said basket bottom wall opening whereby liquid entering said basket from said filter inlet flows through said cartridge element and said basket bottom wall opening to exit said filter outlet.