EP-4739420-A1 - DISCHARGE CLOSURE ELEMENT FOR A FILTER SYSTEM, FILTER ELEMENT, AND FILTER SYSTEM

Abstract

The invention relates to a discharge closure element (150) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body (152) which can be connected to a filter housing (110) of the filter system (100) by means of a rotational and/or plug-in movement with respect to a longitudinal axis (80). The element body (152) has a discharge opening (176) which is closed and/or can be closed by means of a bypass valve (180). The invention additionally relates to a filter element (10) and to a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine.

Inventors

• Jokschas, Günter

Assignees

• MANN+HUMMEL GmbH

Dates

Publication Date

20260513

Application Date

20240624

Claims (1)

1. claims 1. Drain closure element (150) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body (152) which can be connected to a filter housing (110) of the filter system (100) with respect to a longitudinal axis (80) by means of a rotary and/or plug-in movement, wherein the element body (152) has a drain opening (176) which can be closed and/or is closed with a bypass valve (180). 2. Drain closure element according to claim 1, wherein the bypass valve (180) is at least partially formed integrally with the element body (152). 3. Drain closure element according to claim 1 or 2, wherein the bypass valve (180) has a valve body (182) which is linearly displaceable against a compression spring (188) and which is pressed into a valve seat (184) by means of the compression spring (188), wherein the compression spring (188) is supported against a pressure surface (190) arranged on the element body (152). 4. Drain closure element according to one of the preceding claims, wherein the element body (152) has a first sealing surface (172) for sealing against a sealing element (32) of an element drain opening (20) of a filter element (10) of the filter system (100) and a second sealing surface (174) for sealing against a sealing element (36) of a receiving portion (22) of the filter element (10), wherein the sealing surfaces (172, 174) each circumferentially surround the longitudinal axis (80). 5. Drain closure element according to one of the preceding claims, wherein the element body (152) comprises a connecting part (153) and a centering part (154), wherein the centering part (154) has the first sealing surface (172) and the connecting part (153) has the second sealing surface (174), in particular wherein the centering part (154) is movably connected to the connecting part (153) along the longitudinal axis (80), in particular axially limited, in particular wherein the connecting part (153) and the centering part (154) have complementary connecting elements (162, 164) of a connection (160), in particular a snap connection (160), which allows a, in particular axially limited, movement of the centering part (154) along the longitudinal axis (80) relative to the connecting part (153). 6. Drain closure element according to one of the preceding claims, wherein the drain closure element (150) has at least one sealing surface (172, 174), but no seal and/or seal receptacle. 7. Filter element (10) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with at least one filter medium (12), which ches surrounds an element interior (14) and which is connected to an end plate (18) on at least one axial end face (16) with respect to a longitudinal axis (80), wherein the end plate (18) has an element drain opening (20) which is fluidically connected to the element interior (14) and has at least one first sealing element (32) which runs around the element drain opening (20) and which points radially inwards and which, when installed as intended in a filter housing (110) of the filter system (100), can be closed and/or is closed with a drain closure element (150) arranged on a housing part (112) of the filter housing (110) according to one of the preceding claims, wherein the first sealing element (32) is designed to bear sealingly against a first sealing surface (172) of the drain closure element (150), wherein the end plate (18) has a receiving section (22) which is used to guide the Drain closure element (150) which surrounds the element drain opening (20) all the way around and which has at least one second circumferential sealing element (34) which, when installed as intended in the filter housing (110), seals against a sealing surface (130) of the housing part (112), wherein the receiving section (22) has at least one third circumferential sealing element (36) which seals against a second sealing surface (174) of the drain closure element (150). 8. Filter element according to claim 7, wherein the first, second and third sealing elements (32, 34, 36) are designed as radially sealing sealing elements (32, 34, 36). 9. Filter element according to claim 7 or 8, wherein the second sealing element (34) is arranged on the radial outer side (24) of the receiving section (22) and the third sealing element (36) is arranged on a radial inner side (26) of the receiving section (22), or wherein the second and third sealing elements (34, 36) are arranged on a radial outer side (24) of the receiving section (22). 10. Filter element according to one of claims 7 to 9, wherein one of the second and third sealing elements (34, 36) is arranged at a greater radial distance (28) from the longitudinal axis (80) than the other of the second and third sealing elements (36, 34). 11. Filter element according to one of claims 7 to 10, wherein the second sealing element (34) is arranged along the longitudinal axis (80) between the first sealing element (32) and the third sealing element (36) or wherein the second sealing element (34) is arranged at the same height of the longitudinal axis (80) as the third sealing element (36). 12. Filter element according to one of claims 7 to 11, wherein the receiving section (22) is movably connected to the end plate (18) along the longitudinal axis (80), in particular axially limited, in particular wherein the receiving section (22) and the end plate (18) have complementary connections. connection elements (42, 44) of a connection (40) which allows a, in particular axially limited, movement of the receiving portion (22) along the longitudinal axis (80) relative to the end plate (18). 13. Filter element according to one of claims 7 to 12, wherein the first sealing element (32) is integrated into the end plate (18), in particular wherein the first sealing element (32) is formed integrally with the end plate (18). 14. Filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with a filter housing (110) which has at least one fluid inlet (102) and at least one fluid outlet (104) and in which a filter element (10) according to one of claims 7 to 13 is arranged such that it separates the at least one fluid inlet (102) from the at least one fluid outlet (104), and with a drain device (116) for fluid contained in the filter housing (110), which has at least one housing drain opening (118) which can be closed and/or is closed with a drain closure element (150) according to one of claims 1 to 6 during normal operation, wherein the filter element (10) has at least one filter medium (12) which surrounds an element interior (14) and which is connected to an end plate (18) on at least one end face (16), wherein the End plate (18) has an element drain opening (20) which is fluidically connected to the element interior (14) and can be closed and/or is closed with the drain closure element (150) during normal operation. 15. Filter system according to claim 14, wherein the drain closure element (150) has an element body (152) with a first sealing surface (172) for sealing against a sealing element (32) of the element drain opening (20) of the filter element (10) and a second sealing surface (174) for sealing against a sealing element (36) of a receiving section (22) of the filter element (10), which each surround a longitudinal axis (80), wherein the drain closure element (150) can be and/or is connected to the filter housing (110) with respect to the longitudinal axis (80) by means of a rotating and/or plugging movement, wherein the element body (152) has a drain opening (176) which can be and/or is closed with a bypass valve (180). 16. Filter system according to claim 14 or 15, wherein the bypass valve (180) is at least partially formed integrally with the element body (152). 17. Filter system according to one of claims 14 to 16, wherein the bypass valve (180) has a valve body (182) which is linearly displaceable against a compression spring (188) and which is pressed into a valve seat (184) by means of the compression spring (188), wherein the compression spring (188) is supported against a pressure surface (190) arranged on the element body (152), in particular wherein the Valve body (182) is guided on a linear guide (186) connected to the element body (152), in particular formed on the element body (152). 18. Filter system according to one of claims 14 to 17, wherein the element body (152) comprises a connecting part (153) and a centering part (154), wherein the centering part (154) forms the first sealing surface (172) and the connecting part (153) has the second sealing surface (174). 19. Filter system according to claim 18, wherein the centering part (154) is movably connected to the connecting part (153) along the longitudinal axis (80), in particular axially limited, in particular wherein the connecting part (153) and the centering part (154) have complementary connecting elements (162, 164) of a connection (160) which allows a, in particular axially limited, movement of the centering part (154) along the longitudinal axis (80) relative to the connecting part (153).

Description

Drain plug element for a filter system, filter element and filter system technical field The invention relates to a drain closure element for a filter system, as well as a filter element and a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine. State of the art In filter housings of openable hanging filter systems, it is necessary that a drain opening is opened before the housing cover is unscrewed, for example when servicing the filter system, so that the liquid in the housing can drain away. For this purpose, filters are usually equipped with sealing plugs or similar. These sealing plugs require a seal, such as an O-ring, to seal the raw and clean sides. A combination of a sealing plug with an additional function, such as a bypass valve, also requires additional seals to seal against the filter housing. WO 2014/082762 discloses a filter system for a fluid, in particular oil, fuel, water or air, in particular of an internal combustion engine, in particular of a motor vehicle, with a filter housing which has a fluid inlet and a fluid outlet and in which a filter element is arranged such that it separates the fluid inlet from the fluid outlet. The filter system also has a drain device for fluid contained in the filter housing, which has a housing drain opening which can be closed with a closure means. A separating element which separates a clean fluid side of the filter element from a raw fluid side has an element drain opening which can be closed with the closure means. The housing drain opening and the element drain opening are therefore closed with the closure means when the drain device is in the closed state. WO 2019/120976 describes a filter element of a filter for liquid, in particular oil or fuel, in particular of an internal combustion engine, in particular of a motor vehicle, with a filter medium which surrounds an element interior in a circumferentially continuous manner with respect to an imaginary axis and which is connected to an end body on at least one end face axial with respect to the axis. The end body has a filter element idle opening surrounding the axis, which is connected to the element interior, and a filter element sealing surface or filter element sealing surface of a filter element sealing device which surrounds the filter element idle opening in a circumferentially continuous manner and with which the filter element idle opening can be closed when the filter is assembled. The filter element sealing device has at least one seal which is circumferentially continuous with respect to the axis and which is fastened on the side of the filter element. WO 2019/120981 describes a similar filter element in which the filter element sealing surface or filter element sealing surface is axially directed with respect to the axis with at least one directional component. EP 2 072 103 A1 discloses a filter element for an oil filter of an internal combustion engine, in particular for motor vehicles, in which the filter element has a filter bypass valve attached to it in such a way that the filter element together with the filter bypass valve forms a structural unit intended for joint replacement. The filter bypass valve is firmly connected to the filter element, so that the user is forced to replace the filter bypass valve together with the filter element during regular maintenance work. disclosure of the invention An object of the invention is to provide a drain closure element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, which is improved with regard to a drainage solution. A further object of the invention is to provide a filter element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, which is improved with regard to a drainage solution. A further object is to provide a filter system with an improved drainage solution for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with such a filter element. The aforementioned object is achieved according to one aspect of the invention with a drain closure element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body which can be connected to a filter housing of the filter system with respect to a longitudinal axis by means of a rotary and/or plug-in movement, wherein the element body has a drain opening which can be closed and/or is closed with a bypass valve. In a preferred embodiment, the drain closure element or a combination of a drain closure element with an additional component, for example a bypass valve, has no additional seal. In this embodiment, the filter system is sealed by the seals attached to the filter element, which are therefore replaced when the filter element is changed. The drain closure element is ther