Liquid Filter with a Clean-Side Stop Valve as well as an Assembly with a Liquid Filter and a Liquid Circuit

Abstract

A liquid filter for detachable arrangement at a liquid circuit has a filter bellows and an outlet opening at the clean side. A stop valve downstream of the filter bellows closes the outlet opening in an unmounted state of the liquid filter. The stop valve is opened mechanically by a discharge socket of the liquid circuit in a mounted state of the liquid filter. An assembly with liquid circuit and liquid filter detachably arranged at the liquid circuit is provided. The liquid filter has a filter bellows, an outlet opening at the clean side, and a stop valve downstream of the filter bellows closing the outlet opening in an unmounted state of the liquid filter, wherein a discharge socket of the liquid circuit connects to the clean side and actuates and opens mechanically the stop valve of the liquid filter in the mounted state of the liquid filter.

Claims

1. A liquid filter for detachable arrangement at a liquid circuit, the liquid filter comprising: a filter bellows; an outlet opening arranged at a clean side of the liquid filter; a stop valve arranged downstream of the filter bellows, wherein the stop valve closes the outlet opening in an unmounted state of the liquid filter, and wherein the stop valve is configured to be opened mechanically by a discharge socket of the liquid circuit in a mounted state of the liquid filter at the liquid circuit.

2. The liquid filter according to claim 1, wherein the stop valve comprises a stop element closing the outlet opening in the unmounted state of the liquid filter, wherein the stop element comprises a wall and at least one cutout formed in the wall, wherein the at least one cutout forms a passage opening, arranged at the clean side of the liquid filter, in the mounted state of the liquid filter at the liquid circuit.

3. The liquid filter according to claim 2, wherein an inner diameter of the stop element corresponds to an inner diameter of the discharge socket of the liquid circuit.

4. The liquid filter according to claim 2, wherein the stop valve comprises a tensioning element pushing the stop element in the unmounted state of the liquid filter against a valve seat of the stop valve.

5. The liquid filter according to claim 4, wherein the stop element comprises a projection projecting past the valve seat of the stop valve in a direction along a center axis of the liquid filter, wherein the projection rests seal-tightly at a radial seal ring of the liquid filter in the unmounted state of the liquid filter, wherein the radial seal ring separates the clean side of the liquid filter from a raw side of the liquid filter in the mounted state of the liquid filter at the liquid circuit.

6. The liquid filter according to claim 4, wherein the valve seat of the stop valve comprises a shaped seal, and wherein the stop element rests radially and/or axially seal-tightly at the shaped seal in the unmounted state of the liquid filter.

7. The liquid filter according to claim 2, wherein the stop valve further comprises a support element and a spring element, wherein the spring element has a first end supported at the support element and has a second end supported at the stop element, and wherein the stop element is locked captively at the support element.

8. The liquid filter according to claim 7, wherein the support element forms at least partially an end disk framing the filter bellows.

9. The liquid filter according to claim 1, wherein the liquid filter comprises a center axis and is of axial symmetry in relation to the center axis, and wherein the stop valve is arranged coaxially to the center axis of the liquid filter.

10. The liquid filter according to claim 1, further comprising a bayonet closure configured to mount the liquid filter at the liquid circuit or a thread closure configured to mount the liquid filter at the liquid circuit.

11. The liquid filter according to claim 1, further comprising an end disk framing the filter bellows, wherein the stop valve is arranged inside the liquid filter between the filter bellows and the end disk framing the filter bellows.

12. The liquid filter according to claim 11, wherein the stop valve comprises a support element forming at least partially the end disk framing the filter bellows.

13. An assembly comprising: a liquid circuit; a liquid filter detachably arranged at the liquid circuit, the liquid filter comprising a filter bellows, an outlet opening arranged at a clean side of the liquid filter, and a stop valve arranged downstream of the filter bellows, wherein the stop valve closes the outlet opening in an unmounted state of the liquid filter; wherein the liquid circuit comprises a discharge socket configured to connect to the clean side of the liquid filter; wherein the stop valve of the liquid filter is configured to be actuated and opened mechanically by the discharge socket of the liquid circuit in a mounted state of the liquid filter at the liquid circuit.

14. The assembly according to claim 13, wherein the stop valve of the liquid filter comprises a valve seat and a stop element comprising a projection projecting past the valve seat of the stop valve of the liquid filter in a direction along a center axis of the liquid filter, wherein the projection rests seal-tightly at a radial seal ring of the liquid filter in the unmounted state of the liquid filter, wherein the radial seal ring separates the clean side of the liquid filter from a raw side of the liquid filter in the mounted state of the liquid filter at the liquid circuit, wherein the discharge socket rests seal-tightly at the radial seal ring in the mounted state of the liquid filter at the liquid circuit. The assembly according to claim 13, wherein the stop valve of the liquid filter comprises a valve seat comprising a shaped seal and further comprises a stop element, wherein the stop element of the stop valve rests radially and/or axially seal-tightly at the shaped seal in the unmounted state of the liquid filter, wherein the discharge socket seal-tightly rests at the shaped seal in the mounted state of the liquid filter at the liquid circuit.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0037] FIG. 1 shows a first embodiment of a liquid filter with a stop valve in unmounted state in a sectioned side view.

[0038] FIG. 2 shows a first assembly with the first embodiment of the liquid filter of FIG. 1 in a mounted state at a liquid circuit in a sectioned side view.

[0039] FIG. 3 shows a second embodiment of a liquid filter with a stop valve in the unmounted state in a sectioned side view.

[0040] FIG. 4 shows a second assembly with the second embodiment of the liquid filter of FIG. 3 in a mounted state at a liquid circuit in a sectioned side view.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0041] FIG. 1 shows a liquid filter 10 with a housing 12 and a filter bellows 14. The liquid filter 10 comprises a center axis 16. The liquid filter 10 can be of axial symmetry in relation to the center axis 16.

[0042] The filter bellows 14 according to the illustrated embodiment is of a hollow cylindrical configuration and is arranged framed between two end disks 18 in the liquid filter 10. In operation of the liquid filter 10, it is provided that the filter bellows 14 is flowed through substantially in a radially inwardly oriented filtration direction 20. In other words, the filter bellows 14 is flowed through by the fluid to be filtered (not illustrated) from the exterior to the interior, wherein the filter bellows 14, depending on the type, can comprise local deviations from the filtration direction 20. The liquid filter 10 comprises a raw side 22 with unfiltered liquid and a clean side 24 with filtered liquid.

[0043] According to the illustrated embodiment, the liquid filter 10 comprises a pressure-controlled nonreturn device 26. The nonreturn device 26 opens in case the differential pressure between the pressure in front of the nonreturn device 26 and the pressure behind the nonreturn device 26 reaches a predetermined value. When the liquid filter 10 is not in operation, the nonreturn device 26 is closed and the escape of liquid through the nonreturn device 26 is prevented.

[0044] The liquid filter 10 comprises a stop valve 28 that is arranged at the clean side 24 of the liquid filter 10. According to the illustrated embodiment, the stop valve 28 is surrounded completely by the filter bellows 14. In other words, the stop valve 28 is arranged completely inside the filter bellows 14. In this way, the liquid filter 10 can be designed particularly compact.

[0045] The stop valve 28 comprises a support element 30, a stop element 32 as well as a spring element 34. The stop valve 28 closes—as illustrated—an outlet opening 36 of the liquid filter 10.

[0046] The spring element 34 is arranged between the support element 30 and the stop element 32 and causes the stop element 32 to be pressed against a valve seat 38 of the liquid filter 10. The stop valve 28 or the stop element 32 can be manufactured of a sealing material or comprise a sealing material in the contact region with the valve seat 38.

[0047] In accordance with the embodiment, the stop element 32 is configured as a cylinder and comprises a first hollow cylinder section 40 and a second hollow cylinder section 42. The first hollow cylinder section 40 comprises a plurality of cutouts 44 which are formed in the wall of the first hollow cylinder section 40 (for reasons of simplification, only one cutout 44 is provided with a reference character). The first hollow cylinder section 40 projects along the center axis 16 past the valve seat 38.

[0048] According to the illustrated embodiment, the liquid filter 10 comprises a radial seal ring 46 which fluid-tightly seals the stop element 32—here the first hollow cylinder section 40—in relation to the outlet opening 36.

[0049] The stop element 32 is slidingly arranged at the support element 30. In other words, the support element 30 guides the stop element 32 in an opening or closing direction of the stop valve 28 along the center axis 16.

[0050] The stop element 32 comprises at the bottom end of the second hollow cylinder section 42 spring clips 48 which engage behind the support element 30 in an assembled state of the stop valve 28. In this way, the stop element 32 can be attached captively, but movably and detachably, at the support element 30.

[0051] According to the illustrated embodiment, the support element 30 surrounds the spring element 34 and the stop element 32. In other words, the spring element 34 and the stop element 32 are arranged in the interior of the support element 30. In this way, a compact construction unit can be provided.

[0052] The support element 30 is primarily of a cylindrical configuration and comprises cutouts 50 through which the filtered liquid can flow without greater pressure loss. The support element 30 comprises a fastening flange 52 which extends perpendicularly to the center axis 16. The fastening flange 52 is arranged between the filter bellows 14 and the end disk 18. The fastening flange 52 can be glued or welded, for example. In the illustrated embodiment, the fastening flange 52 is arranged so as to be clamped so that the stop valve 28 can be arranged and/or removed particularly easily.

[0053] The liquid filter 10 comprises a bayonet closure 54 which enables a particularly simple and fast fastening of the liquid filter 10.

[0054] FIG. 2 shows an assembly 56 with the liquid filter 10 of FIG. 1 and a liquid circuit 58. The liquid filter 10 is fastened by means of the bayonet closure 54 detachably at the liquid circuit 58.

[0055] A discharge socket 60 of the liquid circuit 58 is in mechanical contact with the stop element 32 of the stop valve 28 so that the latter remains in an open position opposite to the spring force of the spring element 34. In other words, the discharge socket 60 displaces the stop element 32 in the mounted state of the liquid filter 10 at the liquid circuit 58. When the liquid filter 10 is demounted from the liquid circuit 58, the stop element 32 by means of the spring force of the spring element 34 is pressed against the valve seat 38 and closes the liquid filter 10 at the clean side 24.

[0056] In FIG. 2, the radial seal ring 46 contacts the discharge socket 60 and seals the clean side 24 in relation to the raw side 22. In this way, it can be effectively prevented that unfiltered liquid from the raw side 22 can pass to the clean side 24. When the liquid filter 10 is demounted, the stop element 32 contacts seal-tightly the radial seal ring 46.

[0057] In operation of the liquid filter 10, fluid flows along an exemplary flow path 62 through the pressure-opened nonreturn device 26 from the raw side 22 through the filter bellows 14 to the clean side 24 of the liquid filter 10. In other words, the liquid flowing into the fluid filter 10 is filtered by the filter bellows 14. Subsequently, the filtered fluid flows through the cutouts 50 of the support element 30 as well as through the cutouts 44 of the stop element 32.

[0058] While in the mounted state, the cutouts 44 of the stop element 32 are open permanently and are formed as passage openings of the liquid filter 10 toward the liquid circuit 58. Opening of the cutouts 44 by means of the liquid is not required.

[0059] FIG. 3 shows a further embodiment of a liquid filter 10. The liquid filter 10 shown in FIG. 3 differs from the liquid filter 10 illustrated in FIGS. 1 and 2 substantially in that the stop valve 28 projects along the center axis 16 past the filter bellows 14. In other words, the stop valve 28 is not completely arranged inside of the filter bellows 14. This enables the adaptation of the liquid filter 10 to a discharge socket 60 (see FIG. 2) with reduced length. Thus, the liquid filter 10 can be adapted in a particularly easy manner to different liquid circuits 58.

[0060] FIG. 4 shows the liquid filter 10 of FIG. 3 in a second assembly 56 with a liquid circuit 58. The liquid circuit 58 comprises a shortened discharge socket 60. According to the illustration, the liquid filter 10 is in a mounted state at the liquid circuit 58. The discharge socket 60 is in mechanical contact with the stop element 32 of the stop valve 28 and holds it in an open state.

[0061] The discharge socket 60 rests seal-tightly at the valve seat 38. For this purpose, the valve seat 38 can comprise or be comprised of a sealing material. Furthermore, it can be provided that the discharge socket 60 itself comprises or is comprised of a sealing material. Alternatively or additionally, it can be provided that the discharge socket 60 and the valve seat 38 form a fluid-tight press fit.

LIST OF REFERENCE CHARACTERS

[0062] 10 liquid filter

[0063] 12 housing of the liquid filter 10

[0064] 14 filter bellows of the liquid filter 10

[0065] 16 center axis

[0066] 18 end disk

[0067] 20 filter device

[0068] 22 raw side

[0069] 24 clean side

[0070] 26 nonreturn device

[0071] 28 stop valve

[0072] 30 support element of the stop valve 28

[0073] 32 stop element of the stop valve 28

[0074] 34 spring element of the stop valve 28

[0075] 36 outlet opening of the liquid filter 10

[0076] 38 valve seat of the liquid filter 10

[0077] 40 first hollow cylinder section

[0078] 42 second hollow cylinder section

[0079] 44 cutouts in the first hollow cylinder section 40

[0080] 46 radial seal ring

[0081] 48 spring clip

[0082] 50 cutout in the support element 30

[0083] 52 fastening flange of the support element 30

[0084] 54 bayonet closure

[0085] 56 assembly

[0086] 58 liquid circuit

[0087] 60 discharge socket of the liquid circuit 58

[0088] 62 flow path