US20200009483A1 - End plate, filter element, filter system and method for filtering liquid - Google Patents

End plate, filter element, filter system and method for filtering liquid Download PDF

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Publication number
US20200009483A1
US20200009483A1 US16/491,895 US201816491895A US2020009483A1 US 20200009483 A1 US20200009483 A1 US 20200009483A1 US 201816491895 A US201816491895 A US 201816491895A US 2020009483 A1 US2020009483 A1 US 2020009483A1
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US
United States
Prior art keywords
filter
end plate
sealing ring
liquid
free space
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.)
Abandoned
Application number
US16/491,895
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English (en)
Inventor
Valentin Pichlmaier
Roland Krämer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Argo Hytos Group AG
Original Assignee
FSP Fluid Systems Partners Holding AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FSP Fluid Systems Partners Holding AG filed Critical FSP Fluid Systems Partners Holding AG
Assigned to FSP FLUID SYSTEMS PARTNERS HOLDING AG reassignment FSP FLUID SYSTEMS PARTNERS HOLDING AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRÄMER, Roland, PICHLMAIER, VALENTIN
Publication of US20200009483A1 publication Critical patent/US20200009483A1/en
Assigned to ARGO-HYTOS GROUP AG reassignment ARGO-HYTOS GROUP AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: FSP FLUID SYSTEMS PARTNERS HOLDING AG
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/08—Construction of the casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • 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
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps
    • B01D2201/295—End caps with projections extending in a radial outward direction, e.g. for use as a guide, spacing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B01D2201/347—Radial sealings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter
    • B01D2201/4076—Anti-rotational means
    • 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
    • B01D35/147—Bypass or safety valves
    • 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
    • B01D35/30—Filter housing constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

Definitions

  • the invention relates to an end plate for filter material for filtering a liquid, particularly a hydraulic oil with the features of the preamble of claim 1 .
  • An end plate of this type is known for example from DE 10 2013 106 264 A1.
  • the invention further relates to a filter element for filtering a liquid, a filter system and a method for filtering liquid.
  • Hydraulic systems are used for example in construction machines, agricultural machines, machine tools or processing machines.
  • the hydraulic oil used in hydraulic systems is usually filtered.
  • the filter elements used for this absorb the dirt particles from the hydraulic oil and must be replaced after a certain time.
  • DE 10 2013 106 264 A1 describes a filter element for filtering a liquid, with an end plate, which is divided into two parts and has a fixed and a movable plate part, as a result of which the replacement of the filter element is facilitated.
  • a further filter element is known from EP 2 092 970 A1. The known filter elements do not make it possible to automatically determine the degree of contamination of the filter material.
  • the invention is based on the object of specifying an end plate for filter material, for filtering a liquid, which allows the use of a contamination indicator and/or a bypass valve in a filter element or a filter system with such a filter element.
  • the invention is further based on the object of specifying a filter element, a filter system and a method for filtering liquid.
  • the object is achieved with regards to the end plate by means of the subject matter of claim 1 .
  • the filter element, the filter system and the method for filtering liquid the object is achieved according to the invention by means of the subjects of claims 9 , 11 and 14 .
  • the invention is based on the idea of specifying an end plate for filter material for filtering a liquid, particularly a hydraulic oil, having a through opening for filtered liquid, which is surrounded by a sealing ring ( 20 ) for a connecting piece, and a cover for the filter material.
  • the sealing ring delimits a free space for accommodating an anti-rotation lock of a switch and/or bypass valve of a filter system.
  • the invention has the advantage that the anti-rotation lock moves in free space during the actuation of the switch and/or the bypass valve, i.e. can be moved into the free space or out of the free space.
  • the anti-rotation lock is used to guide the switch and/or the bypass valve in a predetermined position in the filter head, so that for example an optimum flow behaviour of the bypass valve or the optimum position of the switching components of the switch is achieved during mounting and during operation.
  • the bypass valve and/or the switch require a minimum travel for actuation and correct mode of action.
  • the free space of the end plate according to the invention means that the anti-rotation lock is effective over the entire travel without the anti-rotation lock colliding with the end plate.
  • the anti-rotation lock In the maximum position, for example in the rest position of the switch and/or the bypass valve, the anti-rotation lock can on the one hand dip completely into the free space of the end plate. On the other hand, a sufficiently large adjustment path is available for actuating the switch and/or the bypass valve, in which the anti-rotation lock guides or holds the switch and/or the bypass valve in the desired position.
  • the delimiting of the free space by the sealing ring provides the design prerequisite for making the filter system compact, because the anti-rotation lock can be arranged in the vicinity of the sealing ring, specifically on the sealing ring. This means that the anti-rotation lock can be arranged close to the through opening in the mounted state.
  • the sealing ring forms the inner wall of the free space and seals against the outlet connection in the mounted state.
  • the sealing ring is preferably constructed in one piece with the end plate.
  • the end plate according to the invention makes it possible not only to equip a filter system with a switch and/or a bypass valve, but even to use a switch and/or bypass valve, which require a particularly large travel.
  • the switch can be used in order to indicate a particular degree of contamination of the filter element.
  • the end plate can be used with a bypass valve, which allows a safety function, for example switching off the filter function, when a particular degree of contamination is reached.
  • the end plate is marketable as such and is therefore disclosed and claimed independently of the filter element.
  • the end plate is disclosed and claimed in connection with the filter element.
  • the end plate forms part of the filter element.
  • the end plate functions as the interface of the filter element to the filter system, in which the filter element is used.
  • the end plate is used on the one hand to transfer the filtered liquid into the filter head of the filter system.
  • the end plate is used to enable the switch function or bypass functions of the filter head.
  • the free space for the anti-rotation lock according to the invention is provided in the end plate.
  • the anti-rotation lock as such does not form part of the end plate but interacts with the same in the installed state.
  • the anti-rotation lock is part of the filter head or the components integrated into the filter head, specifically of the switch and/or the bypass valve.
  • the free space is constructed as an accommodating pocket, which extends between the sealing ring and the cover and has a base.
  • the anti-rotation lock is arranged in the free space between the sealing ring and the cover.
  • the accommodating pocket is preferably of annular construction.
  • this has the advantage in terms of production technology, that the end plate can for example be constructed as an injection-moulded part with flow paths of virtually equal length.
  • the end plate is simple to mount, as it is not necessary to align the end plate relatively to the anti-rotation lock.
  • the cover has an inner ring, wherein the accommodating pocket is constructed between the sealing ring and the inner ring.
  • the inner ring allows an optimal utilization of the overall height of the filter element, as the axial end of the filter material can be arranged in the region of the inner ring and therefore higher than the base of the accommodating pocket, particularly at the same height as the accommodating pocket.
  • the height position of the base or of the axial end of the filter material relates to the longitudinal extent of the filter element.
  • the inner ring may form a positioning ring for a support tube and consequently has a dual function, as the inner ring forms the outer wall of the free space or the accommodating pocket and positions the support tube. Also, in this embodiment, the inner ring is constructed in one piece with the end plate.
  • the free space has a depth in the axial direction with respect to the longitudinal extent of the sealing ring, which at least corresponds to the penetration depth of the anti-rotation lock into the free space.
  • Penetration depth is understood to be the distance by which the anti-rotation lock is moved into the free space.
  • the sealing ring has an upper edge, wherein the depth is at least 5 mm, particularly at least 10 mm, in particular at least 15 mm from the upper edge of the sealing ring.
  • the depth is at least 5 mm, particularly at least 10 mm, in particular at least 15 mm from the upper edge of the sealing ring.
  • the free space, the accommodating pocket in particular preferably has a width in the radial direction starting from the sealing ring, which is at least 2 mm. This has the advantage that the anti-rotation lock can be constructed in a sufficiently stable manner.
  • one advantageous embodiment is that the bypass valve, in the switched state, connects the inlet side of the filter head and the outlet side of the filter head.
  • the switch comprises a reed contact for generating a signal for a contamination indicator.
  • Reed contacts are known as hermetically sealed switches which are actuated by means of an external magnetic field and are very suitable for use in a hydraulic filter system. Accordingly, the switch comprises a magnetic element which interacts with the reed contact.
  • the invention is not limited to certain reed contact types.
  • liquid to be filtered is supplied to a filter system according to the invention, filtered in the filter material and discharged through the through opening of the end plate as filtered liquid.
  • the switch and/or the bypass valve are actuated from a differential limit pressure between the liquid to be filtered and the filtered liquid. As a result, the degree of contamination can be indicated and/or emergency operation of the filter system can be initiated.
  • FIG. 1 shows the section of a filter system with a filter element and an end plate according to an exemplary embodiment according to the invention
  • FIG. 2 shows a detail view of the filter system according to FIG. 1 in the region of the end plate.
  • FIG. 1 shows a filter system 30 for use in a hydraulic system, for example for a construction machine, agricultural machine, machine tool or processing machine.
  • the filter system 30 is generally suitable for hydraulic systems in which hydraulic fluid, particularly hydraulic oil must be filtered.
  • the filter system 30 has a filter head 27 with a first connection 28 and a second connection 29 . Hydraulic fluid to be filtered enters the filter system through the first connection 28 during the use of the filter system 30 . The filtered hydraulic fluid exits the filter system 30 through the second connection 29 .
  • the filter head 27 is connected in a sealed manner, for example screwed, to a filter housing 26 .
  • a filter element 25 is arranged in the filter housing 26 .
  • the filter element 25 comprises a filter material 10 , which effects the filter function during operation.
  • the invention is not limited to certain filter materials.
  • the filter material 10 is constructed from layers folded in a star-shaped manner.
  • the superordinate contour or outer contour of the filter material 10 is cylindrical.
  • the macroscopic shape of the filter material 10 is cylindrical and the microscopic shape of the filter material 10 is star-shaped.
  • the inner wall of the cylindrical filter material 10 bears against a support tube 23 , which has through openings 31 for the hydraulic fluid arranged in the longitudinal direction and in a distributed manner on the circumference.
  • the support tube 23 supports the filter material 10 in the radial direction.
  • the filter element 25 is delimited by two end plates 24 , 32 .
  • the two end plates 24 , 32 bear against the end faces of the filter material 10 .
  • the end plates 24 , 32 , the support tube 23 and the filter material together form the filter element 25 , which can be handled and marketed as one unit.
  • the filter element 25 forms a wearing part, which is replaced as a whole when the filter material 10 is contaminated.
  • the end plate 32 which is arranged at the bottom in the installation direction of the filter element 25 , is closed and seals the interior of the support tube 23 and the filter material 10 in the filter housing 26 downwards.
  • the end plate 24 which is arranged at the top in the installation direction of the filter element 25 , has a through opening 11 , through which the filtered hydraulic oil or, in general, the filtered hydraulic fluid exits the filter element 25 .
  • the through opening 11 is arranged centrally in the end plate 24 , i.e. in the middle. It is also conceivable that the through opening 11 is arranged eccentrically.
  • the filter material 10 , the support tube 23 and the through opening 11 are arranged coaxially. A different arrangement of these components is possible.
  • the upper end plate 24 furthermore has a cover 12 , against which, in the installed state, the filter material 10 , specifically the end face of the filter material 10 bears.
  • the cover 12 has an annular disc 43 , which is arranged coaxially to the through opening 11 .
  • the cover furthermore has an inner ring 21 and an outer ring 33 , which are connected to the annular disc 43 in each case.
  • the inner ring 43 and the outer ring 33 are arranged coaxially and, with the disc 43 , form an annular receptacle for the axial end of the filter material 10 .
  • the inner ring 21 and the outer ring 33 overlap the filter material 10 at least to some extent.
  • a plurality of spacers 34 are arranged at the outer ring 33 , for example in the form of lugs, which position the filter element 25 in the housing in the filter housing 26 in such a manner that an annular gap is formed between the filter material 10 and the inside of the filter housing 26 .
  • the hydraulic oil to be filtered flows through the first connection 28 into the filter head 27 and from there radially outwards, past the upper end plate 24 into an annular gap between the filter element 25 and the filter housing 26 . From there, the hydraulic oil flows through the filter material 10 in the radial direction, flows through the support tube 23 and from there is conveyed in the cleaned state through the through opening 11 back into the filter head 27 again. There, the cleaned hydraulic oil exits through the second connection 29 .
  • the upper end plate 24 is illustrated enlarged in FIG. 2 .
  • a free space 13 is formed between the through opening 11 and the cover 12 , specifically the inner ring 21 of the cover 12 , which, in the installed state, accommodates an anti-rotation lock 14 of a switch 15 and/or a bypass valve 16 of the filter head 27 .
  • the anti-rotation lock 14 is constructed in the example according to FIG. 2 as a pin-shaped projection or protrusion of the switch 15 or the bypass valve 16 .
  • the anti-rotation lock 14 protrudes in the installed state over the disc 43 of the cover 12 in the axial direction of the filter element 25 .
  • the anti-rotation lock 14 and the free space 13 are flush in the axial direction, so that the anti-rotation lock 14 can dip into the free space 13 when the switch 15 or the bypass valve 16 is in the rest position illustrated in FIG. 2 .
  • the depth of the free space 13 i.e. the extent of the free space 13 in the axial direction of the filter element 25 is dimensioned such that the anti-rotation lock 14 can be moved into the free space 13 completely without colliding with the end plate 24 .
  • the section of the anti-rotation lock 14 which protrudes in the axial direction over the cover 12 or projects into the filter element 25 , is accommodated in the free space 13 completely.
  • the free space 13 is constructed as an accommodating pocket 17 , which extends parallel to the flow direction of the liquid through the through opening 11 .
  • the accommodating pocket 17 extends in the axial direction of the filter element 25 .
  • the accommodating pocket 17 has a base 19 , which downwardly delimits the accommodating pocket 17 , i.e. delimits and seals towards the interior of the support tube 23 . This means that the cleaned liquid exits entirely through the through opening 11 and the dirty side is separated from the clean side of the filter system 30 .
  • the accommodating pocket 17 is of annular construction, so that during the mounting of the end plate, it is not necessary to determine the position thereof in the circumferential direction with respect to the anti-rotation lock 14 .
  • the sealing ring 20 and the inner ring 21 are arranged coaxially and extend in the longitudinal direction of the filter element 25 .
  • the sealing ring 20 adjoins the through opening 11 and is used on the one hand to accommodate and seal a connecting piece 22 of the filter head 27 .
  • the sealing ring 20 forms the inner wall of the accommodating pocket 17 .
  • the inner ring 21 adjoins the annular disc 43 of the cover 12 and extends substantially parallel to the sealing ring 20 .
  • the inner ring 21 is used to position the support tube 23 at least during mounting.
  • the inner ring 21 forms the outer wall of the accommodating pocket 17 .
  • the accommodating pocket 17 can also be understood as the annular gap between the cover 12 and the through opening 11 , which annular gap is closed at the bottom, i.e. in the direction of the lower end plate 32 .
  • a plurality of axial ribs 35 are arranged on the circumference of the through opening 11 , which axial ribs extend into the interior of the support tube 23 in the installed state.
  • the filter head 27 has a switch and valve unit 36 , which comprises a switch 15 and a bypass valve 16 as an integrated component. It is also possible to construct the switch 15 and the bypass valve 16 as separate components with their own anti-rotation lock 14 in each case.
  • the accommodating pocket 17 can accommodate a plurality of anti-rotation locks in a distributed manner on the circumference. It is also possible to provide only one switch 15 or only one bypass valve 16 in the filter head 27 .
  • the anti-rotation lock 14 is arranged as a pin-shaped projection or protrusion on a valve body 37 of the bypass valve 16 .
  • the anti-rotation lock 14 and the valve body 37 are preferably constructed in one piece.
  • the valve body 37 is constructed cylindrically.
  • the anti-rotation lock 14 is arranged eccentrically with respect to the valve body 37 , specifically on the circumference of the valve body 37 . This has the advantage that the anti-rotation lock 14 can be arranged close to the through opening 11 .
  • the valve body 37 has a piston 18 , which is guided in a slidable manner in the filter head 27 .
  • the bypass valve 16 specifically the valve body 37 , has a plurality of flow openings, which are arranged in a distributed manner on the circumference of the bypass valve 16 or the valve body 37 .
  • the flow openings are closed, so that the clean side and the dirty side of the filter system 30 are separated.
  • the bypass valve 16 has an axial guide 38 , for example in the form of guide ribs, which encompass a coaxially arranged pin 39 of the switch 15 .
  • the pin 39 is connected to a switch component 40 , which is mounted securely in the filter housing 27 and which contains the electronics of the switch 15 .
  • the axial guide 38 of the bypass valve 16 is connected to a magnetic element 41 , which can be moved on the pin 39 in the axial direction together with the bypass valve 16 , when a corresponding differential limit pressure is reached. As a result, the switch 15 is actuated.
  • a spring 42 is arranged between the valve body 37 and the fixedly arranged switch component 40 , which spring ensures that the bypass valve 16 and the switch 15 remain in the rest position until the differential limit pressure is reached at a certain degree of contamination of the filter element 25 .
  • the reed contact itself can be open or closed in the rest position.
  • the anti-rotation lock 14 blocks a movement in the circumferential direction of the valve body 37 or in general of the bypass valve 16 , so that the valve body 37 can essentially only be moved in the axial direction of the filter element 25 .
  • the anti-rotation lock 14 is in engagement with the filter head, for example by means of a corresponding groove in the filter head 27 .
  • the anti-rotation lock 14 protrudes in the direction of the filter element 25 over the valve body 37 , it is achieved that the anti-rotation lock 14 remains in engagement with the filter housing 27 , even if the bypass valve 16 or the switch 15 are actuated.
  • Different switching points of the bypass valve 16 and the switch 15 can be set by means of the length of the anti-rotation lock 14 .
  • the switch 15 may switch already at a lower differential limit pressure than the bypass valve 16 or vice versa.
  • the filter system according to FIGS. 1 and 2 functions as follows during use.
  • Hydraulic oil to be filtered is supplied to the filter element 25 through the first connection 28 , which hydraulic oil flows through the filter material 10 in the radial direction. From the interior of the support pipe 23 , the cleaned hydraulic oil passes through the through opening 11 back into the filter head 27 and from there through the second connection 29 back into the hydraulic system. With an increasing degree of contamination of the filter material 10 , the back pressure in the region of the first connection 28 increases, which connection is fluidly connected via an annular space to the bypass valve, so that the bypass valve 16 is loaded with the corresponding pressure. When the differential pressure consequently created between the dirty side and the clean side of the filter system 30 exceeds a certain limit value, which results from the spring force of the spring, the bypass valve 16 is actuated, i.e.
  • the anti-rotation lock 14 is also moved in the axial direction, which remains in engagement with the filter housing 27 during the travelling movement of the bypass valve 16 and thus positions the bypass valve 16 and the switch 15 in the circumferential direction.
  • the magnetic element 41 is entrained in the process, so that the switch 15 is actuated and indicates the degree of contamination. If the degree of contamination increases further, the bypass valve 16 is switched, so that the flow openings in the bypass valve 16 are enabled and the clean side is connected to the dirty side, bypassing the filter element 25 (bypass).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtration Of Liquid (AREA)
US16/491,895 2017-05-09 2018-05-07 End plate, filter element, filter system and method for filtering liquid Abandoned US20200009483A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017109924.7A DE102017109924B4 (de) 2017-05-09 2017-05-09 Filtersystem und Verfahren zum Filtrieren von Flüssigkeit
DE102017109924.7 2017-05-09
PCT/EP2018/061724 WO2018206508A1 (de) 2017-05-09 2018-05-07 Endscheibe, filterelement, filtersystem und verfahren zum filtrieren von flüssigkeit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/061724 A-371-Of-International WO2018206508A1 (de) 2017-05-09 2018-05-07 Endscheibe, filterelement, filtersystem und verfahren zum filtrieren von flüssigkeit

Related Child Applications (1)

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US17/489,082 Division US11833454B2 (en) 2017-05-09 2021-09-29 End plate, filter element, filter system and method for filtering liquid

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US20200009483A1 true US20200009483A1 (en) 2020-01-09

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US16/491,895 Abandoned US20200009483A1 (en) 2017-05-09 2018-05-07 End plate, filter element, filter system and method for filtering liquid
US17/489,082 Active 2038-07-31 US11833454B2 (en) 2017-05-09 2021-09-29 End plate, filter element, filter system and method for filtering liquid

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US17/489,082 Active 2038-07-31 US11833454B2 (en) 2017-05-09 2021-09-29 End plate, filter element, filter system and method for filtering liquid

Country Status (5)

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US (2) US20200009483A1 (zh)
EP (1) EP3621718A1 (zh)
CN (2) CN208785848U (zh)
DE (1) DE102017109924B4 (zh)
WO (1) WO2018206508A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115875347A (zh) * 2023-02-17 2023-03-31 烟台中宇航空液压有限公司 一种电液伺服阀的油液过滤装置
EP4015699B1 (fr) 2020-12-15 2023-07-12 Sogefi Filtration Filtre de machine à laver pourvu d'un clapet de dérivation et utilisation d'un élément filtrant avec ce clapet
US20230219022A1 (en) * 2022-01-13 2023-07-13 Deere & Company Bypass valve with variable filter

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EP4015699B1 (fr) 2020-12-15 2023-07-12 Sogefi Filtration Filtre de machine à laver pourvu d'un clapet de dérivation et utilisation d'un élément filtrant avec ce clapet
US20230219022A1 (en) * 2022-01-13 2023-07-13 Deere & Company Bypass valve with variable filter
US11724219B2 (en) * 2022-01-13 2023-08-15 Deere & Company Bypass valve with variable filter
CN115875347A (zh) * 2023-02-17 2023-03-31 烟台中宇航空液压有限公司 一种电液伺服阀的油液过滤装置

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US11833454B2 (en) 2023-12-05
CN208785848U (zh) 2019-04-26
CN108854185B (zh) 2022-12-16
DE102017109924A1 (de) 2018-11-15
WO2018206508A1 (de) 2018-11-15
CN108854185A (zh) 2018-11-23
DE102017109924B4 (de) 2023-04-06
EP3621718A1 (de) 2020-03-18
US20220016549A1 (en) 2022-01-20

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