CA1325606C - Filter - Google Patents
FilterInfo
- Publication number
- CA1325606C CA1325606C CA000609443A CA609443A CA1325606C CA 1325606 C CA1325606 C CA 1325606C CA 000609443 A CA000609443 A CA 000609443A CA 609443 A CA609443 A CA 609443A CA 1325606 C CA1325606 C CA 1325606C
- Authority
- CA
- Canada
- Prior art keywords
- filter element
- filter
- block
- port
- fluid
- 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 - Fee Related
Links
- 239000012530 fluid Substances 0.000 claims abstract description 67
- 230000002093 peripheral effect Effects 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000000356 contaminant Substances 0.000 claims description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 101100074846 Caenorhabditis elegans lin-2 gene Proteins 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 244000228957 Ferula foetida Species 0.000 description 1
- 101100497386 Mus musculus Cask gene Proteins 0.000 description 1
- 244000180577 Sambucus australis Species 0.000 description 1
- 235000018734 Sambucus australis Nutrition 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 235000002020 sage Nutrition 0.000 description 1
- 208000027653 severe early-childhood-onset retinal dystrophy Diseases 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/15—Bidirectional working filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtration Of Liquid (AREA)
Abstract
ABSTRACT
A filter for filtering fluid flowing in either direction comprising a block having first and second peripheral ports with a forward line of flow through said block from the first peripheral port to the second peripheral port, and a reverse line of flow through said block from the second peripheral port to the first peripheral port. A first check valve and a first filter element being disposed in the forward line of flow to only allow fluid flow in the forward direction through the first filter element, and a second check valve and a second filter element disposed in the reverse line of flow to only allow fluid flow in the reverse direction through the second filter element.
A filter for filtering fluid flowing in either direction comprising a block having first and second peripheral ports with a forward line of flow through said block from the first peripheral port to the second peripheral port, and a reverse line of flow through said block from the second peripheral port to the first peripheral port. A first check valve and a first filter element being disposed in the forward line of flow to only allow fluid flow in the forward direction through the first filter element, and a second check valve and a second filter element disposed in the reverse line of flow to only allow fluid flow in the reverse direction through the second filter element.
Description
2~06 ~ 2 --I MPROV13D F ~ LTER
This invention relates to a filter for filtering fluids; in particular, hydraullc fluid~ ~uch as hydraulic oil, a~ used in a wide rang~ of hydraulic actuated system~, In many fl~id systems, such as hydraulic xy~tem6, fluid flow~ in opposite directions at d~ferent points in time in the operating cycle of the ~y~tem and it is desirable to be able to filter the fluid when flowing in either direction. At the present t~me, this 1~ only achieved hy having separate conduits to carry the fluid in re~pective directions with appropriately po~itioned conventional one way filter6 in each lin~ or conduit to fllter the fluid as it flows in the respeckive d~rection~.
Such an arrangement is cumbersome and expensive in that it necessitates duplication of the fluid lines and the provision o~ two independent ~ilters.
In other systems, a ~ingle filter is used and the ~luid flows in the respectiv~ direction therethrough.
However, this sy6tem has the problem that the contaminant6 are not filtered out of the system, but ~re ~ust ~hunted backwards and forwards on either side of the filter, Further, most filters are con~tructed to only operate with the ~luid passing in one direction and the use of such filter6 in a reverse flow situation leads to rapid breakdown of the f~lter element~ and potentially increa6ed contamination of the fluid.
It i~ therefore the principal object of the present invention to provide a filter for use in fluid circuits in which the fluid 10ws at different ti~es in either direction within the circuit.
In accordance with one aspect of the present invention, there is provided a filter for filtering fluid flowi~g in either direction, said filter comprising:
(a) a block having first and second peripheral ports, ~b) a forward lin2 of flow arranged in said block from the first peripheral port to the second peripheral port and including a irst filter el~ment cavity, Disk 00~0/1.14 ~ .
~ . . .,. . ~ .
: . ' ;,, . : , ., ~32~0~
~c) a reverse line of flow arranged in æaid block from thQ second peripheral port to the first periph~ral port and including a second filter element cavity, (d) fir6t check valve means and a first filter element disposed in the forward line of flow for allowing fluid flow in the forward direction and for filtering caid forward Pluld flow, (e) second check valve means and a second filter element dicposed in the reverse line of ~low for allowing fluid flow in the rever~e dlrection a~d for fiItering ~aid reverse fluid flow, (f) ~a1d fir~t and second filter element cavitie6 communicating with the first and second peripheral ports re~pectively, with the first and second filtér elements located in their respective cavities and arranqed to filter in the respective forward and reverse directions fluid sntering the first and second ports respectively, and tg) the ~ilter element cavities b~ing provided in the block in a generally sid~ by side r~lation with the first peripher~l port in one face of the block and the ~eco~d peripheral port in the opposite face of the block.
Conveniently, the forward line of flow includes a fi~st pas6age communicating the downstream side of the fir~t filter element with the second port to ~acilitate filtered ~5 fluld from the first filter~element exlting the second port, and the rever~e line of ~low includes a second passage communicating the downstrea~ side of the secord filter element with the first port to facilitate filtered fluid from the seco~d filter element exiting the first portO
Conveniently, the first and second check valve means may be located i~ either the respective cavities or the respective passages, and preferably on ths downstream ~ide of the respective filter elements. In a pre~erred embodiment, parts of the cavities overlap with parts of the respective passages.
Disk 0060/1.14 -.
~ -:L~2~6~6 In accordance with ancther aspect o~ the presen~
invention, there is provided a filt~r for filtering fluid flowing in either direction through a conduit, said filter comprising:
5a blocX having first and second peripheral ports adapted to be connected to respective sections of a bi-direction~l fluid flow conduit;
first and ~econd fil~er element cavi~ie~ in the block, ~ach supporting therein a 11~er element to respectively filter fluid passing therethrough in a re~pective single direction, the first filter element cavity being in direct communication with the first peripheral port 60 fluid entering the first port is filtered by the filter element in the first cavity, the second fil~er element cavity being in direct communication with the second peripheral port ~o fluid entering the second port is filtered by the filter element ;n the second cavity, the filter ele~ent cavities being provided in the block in a generally side by side relation with the first peripher~l port in one face of the block and the second peripheral port in the opposite face of the block;
a first passage in the block communicating the down~tream 6ide of th~ ~ilter element in tha ~irzt filter element cavity wi h the ~econd peripheral port;
25a second passage~n the bloek communicating th~
downstream side of the filter element in the second filter elem0nt cavity with the first peripheral port; and check valve means for controlling the flow of ~luid in each said first andd second passage so fluid may only flow through each passage in the direction to the respective peripheral ports.
Conveniently, the first and second check valve means are located in the re~pective passages, at a location adjacent to where the passage communicates with the filter cavity.
Di~k OOS0/1.14 .
:
~32~3~
In other embodiments of the invention, the ~ilter may comprise intermediat~ channels having reduced cros~
~ection formed in the respective cavities with the filter elements located at the upstream channel interface and the check valve means located at the downstream channel interface and each pas~age may include a subæidiary condutt provided in the block, the conduits extending in a generally ~ide by ~lde relation interconnecting the cavities~
Conveniently, the respective ports are provided with internal thread~ or threaded elements whereby conventional fluid conduit6 or lines can be conveniently attached thereto. ~lternatively, said respective ports include threaded elements so that fluid lines can be attached thereto.
In a preferred filter con~truction as above de~crib~d, when the luid enters the block through the ~irst peripheral port, it will be ~iltered by the ~ilter element in the first filter element cavity, then pass through the check valve means in the first passage and flow into the ~econd fllter element cavity and hence out through the second peripheral port. When the fluid enter~ the block through the ~econd peripheral port, it will be ftltered by the filter element in the second filter element cavlty, then pas~ through the check valve mean~ in the second passage and 10w into the first filte~ element cavity and hence out through the first peripheral port.
Preferably, the first passage communicate~ with the second filter element cavity on the upstream side of the ~ilter element therein and the ~econd passage communicat2s with the first filter element cavity on the upstream side of the filter element therein so that for each direction of flow, exiting filtered fluid entering the filter element cavity from the passage does not create significant flow about the filter element therein which may cause contaminants removed by said filter element to he picked up in the exiting filtered fluid flow.
Di8k 0060/1.14 .. . ..
- . ~
~32~6a~
The invention will now be described with re~srence to the accompanying drawing, which ~ a central ~ctional view of the filter in accordance with a preferrad embodiment of the pre~ent invention.
Referring now to the drawing;
The rectangular block (10) ha~ two p~ripher~l ports ~15,35) in oppos~e face6 oP the blockO Two elongated filter element cavities (16,36) extend ge~rally parallel ~o each other in the block. Each cavity ~16,36) is in direct communication with a respective port (15,35). Two fllter elements (11,31) are located in their re~pectiv~ cavltie~
(16,36). Each ~ilter element ~11,31) i~ arranged to filter in a re~pective single direction ~luid entering the respective associated port (15,35).
A p~sage extend~ in the block communicating the downstrea~ side of a filter element ~11) with the non-as~ociatsd port (35) to faeilitate f~ltered fluid from the filter element (11) exiting the non-associated port ~35). ~nother pas~age extends in the block co~unicating th~ down8tream ~ide of the other filter element (31) with the other port (lS) to facilitat~ filtered fluid rom the ohter filter element (31) exiting the other port (15).
Thus, a forward line of flow is formed extending from one port (15) to the other port (35) and a reverse line of Plow is formed extendin~from the other port (35) to said one port (15).
Two oheck valve means (12,32) are provided on the downstream side of the respective filter elements ~11,31) to allow filtered fluid flow i~ the re~pective single direction through the respective forward and reverse lines of flow~
It is appreciated that the check valve means may be located in the respective cavities or the respective pas~ages, and section~ of the cavities and passages may also overlap.
Further, the check valve means may be pro~ided on the 3~ upstream 6ide of the respective ~ilter element~ ( 11, 31 ) to prevent any ~luid flow in a re~pective line in the direc~ion opposite ~o that of ~he line of flow.
Disk 0060/1.14 ~' .
. . .. . . . .
, 132~606 Each cavity has an intermediate channel (17,37~ of narrow~r cross B~ction than the general cros~ ~ection o~ the cavity. Each filter element (11,31) is securely ~eated at the intermediate channel interface which i~ on the side towards the port (15,35) and orientated such that fluid flowing from the port (15,35) to the intermediate channel t17,37) will be filtered.
~ ach passage include~ a ~ubsidiary conduit (20,40).
The cavitie~ (16,36~ are interconnected by the subsidlary conduits ~20,40) extending generally parallel to each other in the block. Each subsidiary conduit (20,40) connects an associated cavity ~16,36) on one end and the other non-as~ociated cavity (36,16) on the other ~nd. It intersect~ the other non-as~ociated cavity at a location located between the intermediate channel of the other cavity and the non-a~sociated port (35,15) distant from the filter element n the other cavity.
In the construction of the ilter block (10), there are formed extended end portions to each c~vity (16,36) 80 20 that each cavity has a ~econd opening on the opposite 6ide of the block (10~ to that of its port (15,35). The second openings on opposite side~ of the block (10) are closed by plug (14,34).
Likewise, extended end portions to the subsidiary 25 conduit~ on one end are ~ormed so that each ~ub~idiary conduit (20,40) ha~ an opening on a side of the block.
The~ openings on oppo~ite ~ldes of the block (10) are closed by plugs (13,33). Second extended end portions (not shown) to .he subsidiary conduits may also be ormed on the other end such that the conduits extend through th~ block.
It will be appreciated that these openings facilitate quick and easy a~sembling and dissembling of the part~ of the filter and allow ~or quick and easy cleaning of the ~avities and the subsidiary conduits in the block, for example, by flu~hing.
Di~k 0060/1.14 A
. ~
, ~ ' . . . :
.
-- 13256~
The general cros6 ~ect~on of the cavitie~ ~16,36) ls wider than that of the sub~idiary conduits (20,40) which i~ wider than the intermediate channel~ (17,37) of the cavities. The relative general cro~ ~ections of the cavities, the subsidiary conduits and the intermediate channels are ~uch that the fluid flow from each cavity through its intermediate channels into its as~ociated ~ubsidiary conduit i~ substantially without re~triction~
under operating fluid pressure.
In the continuous passage down~trsam of the filter element between the lntermediate channel (17,37) of each cavity (16,36) and the intersection between its associated sub idiary conduit (20,40) and the other non-associated cavity (36,16), the check valves (12,32) may be provided.
Each check valve i8 securely seated at the other interfaces of the respective intermedlate channel~ and orientated ~uch that ~luid flow from each cavity (16,36) to its a~sociated ~ub6idiary eonduit (20,40) ~ 5 n~t restricted but reverse fluid flow in the opposite direction is prevented.
2Q When ~n operation, the block (lQ) is connected to the hydraulic circuit having fluid sources or reservoir~ by pip2S or conduits attached to the ports (15,35); and may be mounted on the hydraulic implemen~ by the ~ore holes (50,52 in the block.
In a forwar~-flo~ oper~ting mode, contaminated ~luid ent~rs the block at port (15) under a pre6sure. The 1uid travels along the cavity (16) and ls filtered by the filter element (11) and allowed passage by check valve (12~.
The filtered fluid then travels along sub~idiary conduit t20) into the other cavity (36) and exits the block at the other port (35) on the opposite side of the block to port (15).
~ oweverr any fluid that enters the other sub~idiary conduit (40) will activate the other check valve (32) and 35 thu~, reverse fluid flow ~rom th~ otheF ub~idiary conduit (40) to the other cavity (36) will be prevented. Any contamination deposited on the other filter element (31) will not be set free by any reverse 1uid flow and ~ubsequently collected by the filtered fluid abovementioned.
:. '` ~ ~ . , ; .: ~' -` 13256~
In a reverse-flow operating mode, contaminated fluid enters the block at the other port (35) and exits the block at port (15) on the opposite side of the block. The respective identical parts o~ the filter perform their respective opposite corresponding roles as in the forward-flow operating mode.
During either operating mode, pressure gauge can be connected to openings o~ ~u~sidiary conduits (20,40) to continuously monitor the fluid pressure in~ide the block and ~llow for control thereof.
In the preferred embodiment, the filter element i6 a 6i~tered bronze filter element, for example 40 micron, an~
further, the check valve i~ a metallic ball valve, for example, a chrome ball~ s~curely po~itioned by a spring of 15 predetermined rate which i8 retained by the plugs (14,34).
Conveniently, the filter element ~s securely seated by a spring of sufficient rate which i8 retained by eonnecting element~ between the fluid source pipes and the ports (15,35). ~he relati~e rate of the springs is dependent upon 20 the operating fluid pressure. In practice, the hydraulic syste~ may b~ operated under a fluid pressure of 2500 p.~.i.
and the corresponding fluid flow rate may be 15 gal/min.
Disk 0060/1.14 ~, ` ~
.. . .. . .
:
This invention relates to a filter for filtering fluids; in particular, hydraullc fluid~ ~uch as hydraulic oil, a~ used in a wide rang~ of hydraulic actuated system~, In many fl~id systems, such as hydraulic xy~tem6, fluid flow~ in opposite directions at d~ferent points in time in the operating cycle of the ~y~tem and it is desirable to be able to filter the fluid when flowing in either direction. At the present t~me, this 1~ only achieved hy having separate conduits to carry the fluid in re~pective directions with appropriately po~itioned conventional one way filter6 in each lin~ or conduit to fllter the fluid as it flows in the respeckive d~rection~.
Such an arrangement is cumbersome and expensive in that it necessitates duplication of the fluid lines and the provision o~ two independent ~ilters.
In other systems, a ~ingle filter is used and the ~luid flows in the respectiv~ direction therethrough.
However, this sy6tem has the problem that the contaminant6 are not filtered out of the system, but ~re ~ust ~hunted backwards and forwards on either side of the filter, Further, most filters are con~tructed to only operate with the ~luid passing in one direction and the use of such filter6 in a reverse flow situation leads to rapid breakdown of the f~lter element~ and potentially increa6ed contamination of the fluid.
It i~ therefore the principal object of the present invention to provide a filter for use in fluid circuits in which the fluid 10ws at different ti~es in either direction within the circuit.
In accordance with one aspect of the present invention, there is provided a filter for filtering fluid flowi~g in either direction, said filter comprising:
(a) a block having first and second peripheral ports, ~b) a forward lin2 of flow arranged in said block from the first peripheral port to the second peripheral port and including a irst filter el~ment cavity, Disk 00~0/1.14 ~ .
~ . . .,. . ~ .
: . ' ;,, . : , ., ~32~0~
~c) a reverse line of flow arranged in æaid block from thQ second peripheral port to the first periph~ral port and including a second filter element cavity, (d) fir6t check valve means and a first filter element disposed in the forward line of flow for allowing fluid flow in the forward direction and for filtering caid forward Pluld flow, (e) second check valve means and a second filter element dicposed in the reverse line of ~low for allowing fluid flow in the rever~e dlrection a~d for fiItering ~aid reverse fluid flow, (f) ~a1d fir~t and second filter element cavitie6 communicating with the first and second peripheral ports re~pectively, with the first and second filtér elements located in their respective cavities and arranqed to filter in the respective forward and reverse directions fluid sntering the first and second ports respectively, and tg) the ~ilter element cavities b~ing provided in the block in a generally sid~ by side r~lation with the first peripher~l port in one face of the block and the ~eco~d peripheral port in the opposite face of the block.
Conveniently, the forward line of flow includes a fi~st pas6age communicating the downstream side of the fir~t filter element with the second port to ~acilitate filtered ~5 fluld from the first filter~element exlting the second port, and the rever~e line of ~low includes a second passage communicating the downstrea~ side of the secord filter element with the first port to facilitate filtered fluid from the seco~d filter element exiting the first portO
Conveniently, the first and second check valve means may be located i~ either the respective cavities or the respective passages, and preferably on ths downstream ~ide of the respective filter elements. In a pre~erred embodiment, parts of the cavities overlap with parts of the respective passages.
Disk 0060/1.14 -.
~ -:L~2~6~6 In accordance with ancther aspect o~ the presen~
invention, there is provided a filt~r for filtering fluid flowing in either direction through a conduit, said filter comprising:
5a blocX having first and second peripheral ports adapted to be connected to respective sections of a bi-direction~l fluid flow conduit;
first and ~econd fil~er element cavi~ie~ in the block, ~ach supporting therein a 11~er element to respectively filter fluid passing therethrough in a re~pective single direction, the first filter element cavity being in direct communication with the first peripheral port 60 fluid entering the first port is filtered by the filter element in the first cavity, the second fil~er element cavity being in direct communication with the second peripheral port ~o fluid entering the second port is filtered by the filter element ;n the second cavity, the filter ele~ent cavities being provided in the block in a generally side by side relation with the first peripher~l port in one face of the block and the second peripheral port in the opposite face of the block;
a first passage in the block communicating the down~tream 6ide of th~ ~ilter element in tha ~irzt filter element cavity wi h the ~econd peripheral port;
25a second passage~n the bloek communicating th~
downstream side of the filter element in the second filter elem0nt cavity with the first peripheral port; and check valve means for controlling the flow of ~luid in each said first andd second passage so fluid may only flow through each passage in the direction to the respective peripheral ports.
Conveniently, the first and second check valve means are located in the re~pective passages, at a location adjacent to where the passage communicates with the filter cavity.
Di~k OOS0/1.14 .
:
~32~3~
In other embodiments of the invention, the ~ilter may comprise intermediat~ channels having reduced cros~
~ection formed in the respective cavities with the filter elements located at the upstream channel interface and the check valve means located at the downstream channel interface and each pas~age may include a subæidiary condutt provided in the block, the conduits extending in a generally ~ide by ~lde relation interconnecting the cavities~
Conveniently, the respective ports are provided with internal thread~ or threaded elements whereby conventional fluid conduit6 or lines can be conveniently attached thereto. ~lternatively, said respective ports include threaded elements so that fluid lines can be attached thereto.
In a preferred filter con~truction as above de~crib~d, when the luid enters the block through the ~irst peripheral port, it will be ~iltered by the ~ilter element in the first filter element cavity, then pass through the check valve means in the first passage and flow into the ~econd fllter element cavity and hence out through the second peripheral port. When the fluid enter~ the block through the ~econd peripheral port, it will be ftltered by the filter element in the second filter element cavlty, then pas~ through the check valve mean~ in the second passage and 10w into the first filte~ element cavity and hence out through the first peripheral port.
Preferably, the first passage communicate~ with the second filter element cavity on the upstream side of the ~ilter element therein and the ~econd passage communicat2s with the first filter element cavity on the upstream side of the filter element therein so that for each direction of flow, exiting filtered fluid entering the filter element cavity from the passage does not create significant flow about the filter element therein which may cause contaminants removed by said filter element to he picked up in the exiting filtered fluid flow.
Di8k 0060/1.14 .. . ..
- . ~
~32~6a~
The invention will now be described with re~srence to the accompanying drawing, which ~ a central ~ctional view of the filter in accordance with a preferrad embodiment of the pre~ent invention.
Referring now to the drawing;
The rectangular block (10) ha~ two p~ripher~l ports ~15,35) in oppos~e face6 oP the blockO Two elongated filter element cavities (16,36) extend ge~rally parallel ~o each other in the block. Each cavity ~16,36) is in direct communication with a respective port (15,35). Two fllter elements (11,31) are located in their re~pectiv~ cavltie~
(16,36). Each ~ilter element ~11,31) i~ arranged to filter in a re~pective single direction ~luid entering the respective associated port (15,35).
A p~sage extend~ in the block communicating the downstrea~ side of a filter element ~11) with the non-as~ociatsd port (35) to faeilitate f~ltered fluid from the filter element (11) exiting the non-associated port ~35). ~nother pas~age extends in the block co~unicating th~ down8tream ~ide of the other filter element (31) with the other port (lS) to facilitat~ filtered fluid rom the ohter filter element (31) exiting the other port (15).
Thus, a forward line of flow is formed extending from one port (15) to the other port (35) and a reverse line of Plow is formed extendin~from the other port (35) to said one port (15).
Two oheck valve means (12,32) are provided on the downstream side of the respective filter elements ~11,31) to allow filtered fluid flow i~ the re~pective single direction through the respective forward and reverse lines of flow~
It is appreciated that the check valve means may be located in the respective cavities or the respective pas~ages, and section~ of the cavities and passages may also overlap.
Further, the check valve means may be pro~ided on the 3~ upstream 6ide of the respective ~ilter element~ ( 11, 31 ) to prevent any ~luid flow in a re~pective line in the direc~ion opposite ~o that of ~he line of flow.
Disk 0060/1.14 ~' .
. . .. . . . .
, 132~606 Each cavity has an intermediate channel (17,37~ of narrow~r cross B~ction than the general cros~ ~ection o~ the cavity. Each filter element (11,31) is securely ~eated at the intermediate channel interface which i~ on the side towards the port (15,35) and orientated such that fluid flowing from the port (15,35) to the intermediate channel t17,37) will be filtered.
~ ach passage include~ a ~ubsidiary conduit (20,40).
The cavitie~ (16,36~ are interconnected by the subsidlary conduits ~20,40) extending generally parallel to each other in the block. Each subsidiary conduit (20,40) connects an associated cavity ~16,36) on one end and the other non-as~ociated cavity (36,16) on the other ~nd. It intersect~ the other non-as~ociated cavity at a location located between the intermediate channel of the other cavity and the non-a~sociated port (35,15) distant from the filter element n the other cavity.
In the construction of the ilter block (10), there are formed extended end portions to each c~vity (16,36) 80 20 that each cavity has a ~econd opening on the opposite 6ide of the block (10~ to that of its port (15,35). The second openings on opposite side~ of the block (10) are closed by plug (14,34).
Likewise, extended end portions to the subsidiary 25 conduit~ on one end are ~ormed so that each ~ub~idiary conduit (20,40) ha~ an opening on a side of the block.
The~ openings on oppo~ite ~ldes of the block (10) are closed by plugs (13,33). Second extended end portions (not shown) to .he subsidiary conduits may also be ormed on the other end such that the conduits extend through th~ block.
It will be appreciated that these openings facilitate quick and easy a~sembling and dissembling of the part~ of the filter and allow ~or quick and easy cleaning of the ~avities and the subsidiary conduits in the block, for example, by flu~hing.
Di~k 0060/1.14 A
. ~
, ~ ' . . . :
.
-- 13256~
The general cros6 ~ect~on of the cavitie~ ~16,36) ls wider than that of the sub~idiary conduits (20,40) which i~ wider than the intermediate channel~ (17,37) of the cavities. The relative general cro~ ~ections of the cavities, the subsidiary conduits and the intermediate channels are ~uch that the fluid flow from each cavity through its intermediate channels into its as~ociated ~ubsidiary conduit i~ substantially without re~triction~
under operating fluid pressure.
In the continuous passage down~trsam of the filter element between the lntermediate channel (17,37) of each cavity (16,36) and the intersection between its associated sub idiary conduit (20,40) and the other non-associated cavity (36,16), the check valves (12,32) may be provided.
Each check valve i8 securely seated at the other interfaces of the respective intermedlate channel~ and orientated ~uch that ~luid flow from each cavity (16,36) to its a~sociated ~ub6idiary eonduit (20,40) ~ 5 n~t restricted but reverse fluid flow in the opposite direction is prevented.
2Q When ~n operation, the block (lQ) is connected to the hydraulic circuit having fluid sources or reservoir~ by pip2S or conduits attached to the ports (15,35); and may be mounted on the hydraulic implemen~ by the ~ore holes (50,52 in the block.
In a forwar~-flo~ oper~ting mode, contaminated ~luid ent~rs the block at port (15) under a pre6sure. The 1uid travels along the cavity (16) and ls filtered by the filter element (11) and allowed passage by check valve (12~.
The filtered fluid then travels along sub~idiary conduit t20) into the other cavity (36) and exits the block at the other port (35) on the opposite side of the block to port (15).
~ oweverr any fluid that enters the other sub~idiary conduit (40) will activate the other check valve (32) and 35 thu~, reverse fluid flow ~rom th~ otheF ub~idiary conduit (40) to the other cavity (36) will be prevented. Any contamination deposited on the other filter element (31) will not be set free by any reverse 1uid flow and ~ubsequently collected by the filtered fluid abovementioned.
:. '` ~ ~ . , ; .: ~' -` 13256~
In a reverse-flow operating mode, contaminated fluid enters the block at the other port (35) and exits the block at port (15) on the opposite side of the block. The respective identical parts o~ the filter perform their respective opposite corresponding roles as in the forward-flow operating mode.
During either operating mode, pressure gauge can be connected to openings o~ ~u~sidiary conduits (20,40) to continuously monitor the fluid pressure in~ide the block and ~llow for control thereof.
In the preferred embodiment, the filter element i6 a 6i~tered bronze filter element, for example 40 micron, an~
further, the check valve i~ a metallic ball valve, for example, a chrome ball~ s~curely po~itioned by a spring of 15 predetermined rate which i8 retained by the plugs (14,34).
Conveniently, the filter element ~s securely seated by a spring of sufficient rate which i8 retained by eonnecting element~ between the fluid source pipes and the ports (15,35). ~he relati~e rate of the springs is dependent upon 20 the operating fluid pressure. In practice, the hydraulic syste~ may b~ operated under a fluid pressure of 2500 p.~.i.
and the corresponding fluid flow rate may be 15 gal/min.
Disk 0060/1.14 ~, ` ~
.. . .. . .
:
Claims (17)
1. A filter for filtering fluid flowing in either direction, said filter comprising:
(a) a block having first and second peripheral ports, (b) a forward line of flow arranged in said block from the first peripheral port to the second peripheral port and including a first filter element cavity, (c) a reverse line of flow arranged in said block from the second peripheral port to the first peripheral port and including a second filter element cavity, (d) first check valve means and a first filter element disposed in the forward line of flow for allowing fluid flow in the forward direction and for filtering said forward fluid flow, (e) second check valve means and a second filter element disposed in the reverse line of flow for allowing fluid flow in the reverse direction and for filtering said reverse fluid flow, (f) said first and second filter element cavities communicating with the first and second peripheral ports respectively, with the first and second filter elements located in their respective cavities and arranged to filter in the respective forward and reverse directions fluid entering the first and second ports respectively, and (g) the filter element cavities being provided in the block in a generally side by side relation with the first peripheral port in one face of the block and the second peripheral port in the opposite face of the block.
(a) a block having first and second peripheral ports, (b) a forward line of flow arranged in said block from the first peripheral port to the second peripheral port and including a first filter element cavity, (c) a reverse line of flow arranged in said block from the second peripheral port to the first peripheral port and including a second filter element cavity, (d) first check valve means and a first filter element disposed in the forward line of flow for allowing fluid flow in the forward direction and for filtering said forward fluid flow, (e) second check valve means and a second filter element disposed in the reverse line of flow for allowing fluid flow in the reverse direction and for filtering said reverse fluid flow, (f) said first and second filter element cavities communicating with the first and second peripheral ports respectively, with the first and second filter elements located in their respective cavities and arranged to filter in the respective forward and reverse directions fluid entering the first and second ports respectively, and (g) the filter element cavities being provided in the block in a generally side by side relation with the first peripheral port in one face of the block and the second peripheral port in the opposite face of the block.
2. A filter according to claim 1, wherein the forward line of flow includes a first passage communicating the downstream side of the first filter element with the second port to facilitate filtered fluid from the first filter element exiting the second port, and the reverse line of flow includes a second passage communicating the downstream side of the second filter element with the first port to facilitate filtered fluid from the second filter element exiting the first port.
3. A filter according to claim 1, wherein the first and second check valve means are located on the downstream side of the respective filter elements.
4. A filter according to claim 2, wherein the first and second check valve means are located in the respective passages.
5. A filter according to claim 1 or 2, further comprising intermediate channels having reduced cross section formed in the respective cavities with the filter element located at the upstream channel interface and the check valve means located at the downstream channel interface.
6. A filter according to claim 2, wherein each passage includes a subsidiary conduit provided in the block, the conduits extending in a generally side by side relation interconnecting the cavities.
7. A filter according to claim 6, wherein at least one end of each conduit extends through the block providing at least one through hole in a face of the block, said holes are closed by plugs.
8. A filter according to claim 1, 2, 6 or 7, wherein each cavity extends through the block providing another opening in a face of the block opposite the port, said openings are closed by plugs.
9. A filter for filtering fluid flowing in either direction through a conduit, said filter comprising:
a block having first and second peripheral ports adapted to be connected to respective sections of a bi-directional fluid flow conduit;
first and second filter element cavities in the block, each supporting therein a filter element to respectively filter fluid passing therethrough in a respective single direction, the first filter element cavity being in direct communication with the first peripheral port so fluid entering the first port is filtered by the filter element in the first cavity, the second filter element cavity being in direct communication with the second peripheral port so fluid entering the second port is filtered by the filter element in the second cavity, the filter element cavities being provided in the block in a generally side by side relation with the first peripheral port in one face of the block and the second peripheral port in the opposite face of the block;
a first passage in the block communicating the downstream side of the filter element in the first filter element cavity with the second peripheral port;
a second passage in the block communicating the downstream side of the filter element in the second filter element cavity with the first peripheral port; and check valve means for controlling the flow of fluid in each said first and second passages so fluid may only flow through each passage in the direction to the respective peripheral ports.
a block having first and second peripheral ports adapted to be connected to respective sections of a bi-directional fluid flow conduit;
first and second filter element cavities in the block, each supporting therein a filter element to respectively filter fluid passing therethrough in a respective single direction, the first filter element cavity being in direct communication with the first peripheral port so fluid entering the first port is filtered by the filter element in the first cavity, the second filter element cavity being in direct communication with the second peripheral port so fluid entering the second port is filtered by the filter element in the second cavity, the filter element cavities being provided in the block in a generally side by side relation with the first peripheral port in one face of the block and the second peripheral port in the opposite face of the block;
a first passage in the block communicating the downstream side of the filter element in the first filter element cavity with the second peripheral port;
a second passage in the block communicating the downstream side of the filter element in the second filter element cavity with the first peripheral port; and check valve means for controlling the flow of fluid in each said first and second passages so fluid may only flow through each passage in the direction to the respective peripheral ports.
10. A filter according to claim 9, wherein the first and second check valve means are located in the respective passages, at a location adjacent to where the passage communicates with the filter cavity.
11. A filter according to claim 9, wherein the first passage communicates with the second filter element cavity on the upstream side of the filter element therein and the second passage communicates with the first filter element cavity on the upstream side of the filter element therein so that for each direction of flow, exiting filtered fluid entering the filter element cavity from the passage does not create significant flow about the filter element therein which may cause contaminants removed by said filter element to be picked up in the exiting filtered fluid flow.
12. A filter according to claim 9, further comprising intermediate channels having reduced cross section formed in the respective cavities with the filter elements located at the upstream channel interface and the check valve means located at the downstream channel interface.
13. A filter according to claim 9, wherein each passage includes a subsidiary conduit provided in the block, the conduits extending in a generally side by side relation interconnecting the cavities.
14. A filter according to claim 13, wherein at least one end of each conduit extends through the block providing at least one through hole in a face of the block, said holes are closed by plugs.
15. A filter according to claim 9, 11, 13 or 14 wherein each cavity extends through the block providing another opening in a face of the block opposite the port, said openings are closed by plugs.
16. A filter according to claim 1 or 9, wherein the respective ports are provided with internal threads or threaded elements whereby fluid conduits or lines can be attached thereto.
17. A filter according to claim 1 or 9, wherein said respective ports include threaded elements so that fluid lines can be attached thereto.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU20620/88A AU597847B2 (en) | 1987-08-11 | 1987-08-11 | Improved filter |
| US07/282,491 US4923602A (en) | 1987-08-11 | 1988-12-12 | Bi-directional flow filter |
| CA000609443A CA1325606C (en) | 1987-08-11 | 1989-08-25 | Filter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPI366887 | 1987-08-11 | ||
| AU20620/88A AU597847B2 (en) | 1987-08-11 | 1987-08-11 | Improved filter |
| CA000609443A CA1325606C (en) | 1987-08-11 | 1989-08-25 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1325606C true CA1325606C (en) | 1993-12-28 |
Family
ID=27152594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000609443A Expired - Fee Related CA1325606C (en) | 1987-08-11 | 1989-08-25 | Filter |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU597847B2 (en) |
| CA (1) | CA1325606C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA912635B (en) * | 1990-04-16 | 1992-01-29 | Ingersoll Rand Co | Percussion tool fluid filter apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4003397A (en) * | 1973-05-01 | 1977-01-18 | Pall Corporation | Dual coaxial bidirectional valves and filter assemblies and hydrostat systems containing the same |
| US4009572A (en) * | 1973-05-01 | 1977-03-01 | Pall Corporation | Hydrostat systems containing coaxial multidirectional flow control valves |
| US4469594A (en) * | 1982-11-12 | 1984-09-04 | Harnischfeger Corporation | High pressure hydraulic system and self-cleaning filter assembly therefor |
-
1987
- 1987-08-11 AU AU20620/88A patent/AU597847B2/en not_active Ceased
-
1989
- 1989-08-25 CA CA000609443A patent/CA1325606C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| AU2062088A (en) | 1989-02-16 |
| AU597847B2 (en) | 1990-06-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |