Filter element of a filter for liquid, drain closure element for a drain opening in a filter housing, housing part of a filter housing and filter

Abstract

A filter element of a filter for liquid, a drainage closure element, a housing part, and a filter are described, wherein the filter element has a filter medium which continuously surrounds circumferentially an element interior relative to a virtual axis and is connected to an axial end body. The end body is provided with a filter element drainage opening surrounding the axis and communicating with the element interior. A filter element sealing surface or filter element seal surface of a filter element sealing device is provided at the end body and continuously surrounds circumferentially the filter element drainage opening. The filter element drainage opening is closed by the filter element sealing device when the filter element is mounted in the filter housing of the filter. The filter element sealing surface or filter element seal surface is axially oriented with at least one direction component relative to the axis.

Claims

1. A filter element of a filter for liquid, the filter element comprising: at least one filter medium continuously surrounding circumferentially an element interior relative to a virtual axis of the filter element; an end body connected to an axial end face of the at least one filter medium; wherein the end body comprises a filter element sealing device comprising: a seal positioning element formed on an axially outer side of the end body and projecting outwardly away from the element interior, the seal positioning element comprising: a plurality of radially outwardly projecting seal positioning sections circumferentially spaced apart about an outer circumference of the seal positioning element; wherein the plurality of radially outwardly projecting seal positioning sections have radially outward-facing positioning surfaces for positioning a ring-shaped seal; a filter element drainage opening extending axially through an interior seal positioning element, surrounding the virtual axis and communicating with the element interior; wherein the filter element drainage opening surrounds the virtual axis; the ring-shaped seal having a radially inner surface resting with interruptions on the radially outward-facing positioning surfaces, the ring-shaped seal further comprising: at least one ring-shaped filter element sealing surface arranged on an axially outer face of the ring-shaped seal and continuously surrounding circumferentially the filter element drainage opening; wherein the seal positioning element with the ring-shaped seal of the filter element sealing device are configured to close the filter element drainage opening when the filter element is mounted in a filter housing of the filter.

2. The filter element according to claim 1, wherein the annular ring-shaped seal is a sleeve.

3. The filter element according to claim 1, wherein the filter element drainage opening connects a raw side of the filter element to a clean side of the filter element.

4. The filter element according to claim 1, wherein the filter element sealing device is configured to be elastic at least in an axial direction relative to the virtual axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages, features, and details of the invention result from the following description in which an embodiment of the invention will be explained in more detail with the aid of the drawing. A person of skill in the art will consider the features disclosed in the drawing, the description, and the claims in combination also expediently individually and combine them to expedient further combinations.

(2) FIG. 1 shows a longitudinal section of a filter for liquid according to a first embodiment.

(3) FIG. 2 shows an isometric detail view of a housing cover of the filter of FIG. 1 in the region of a drainage opening for the liquid.

(4) FIG. 3 shows an isometric detail view of a filter element of the filter of FIG. 1 in the region of a filter element drainage opening for the liquid.

(5) FIG. 4 shows a longitudinal section of a filter for liquid according to a second embodiment.

(6) FIG. 5 shows an interior of the filter housing of the filter of FIG. 4 without filter element.

(7) FIG. 6 shows a longitudinal section of a filter for liquid according to a third embodiment.

(8) FIG. 7 shows the interior of the filter housing of the filter of FIG. 6 without filter element.

(9) FIG. 8 shows a longitudinal section of a filter for liquid according to a fourth embodiment.

(10) FIG. 9 shows a cross section of the filter of FIG. 8 along the section line IX-IX therein.

(11) Same components are provided with same reference characters in the Figures.

DESCRIPTION OF PREFERRED EMBODIMENTS

(12) In FIGS. 1 to 3, a filter 10 for liquid is illustrated in a longitudinal section and in detail views. For example, the filter 10 can be arranged in a liquid circuit, for example, in a motor oil circuit or in a fuel circuit, for example, of an internal combustion engine, for example, of a motor vehicle.

(13) The filter 10 comprises a filter housing 12 of which in FIG. 1 only the housing cover 14 is illustrated. The housing cover 14 is screwed, spatially at the bottom, into a main housing, not illustrated, of the filter housing 12. The filter housing 12 comprises a liquid inlet for the liquid to be purified and a liquid outlet for purified liquid, which are both not shown in FIG. 1.

(14) Moreover, the filter housing 12 comprises at the spatially lowest position of the housing cover 14 a drainage assembly 16 through which the liquid can be drained from the interior of the filter housing 12, for example, for servicing purposes. In the filter housing 12, a filter element 18 embodied as a round filter element is arranged such that it separates the liquid inlet from the liquid outlet. The filter element 18 is attached to the housing cover 14 so as to be separable in a way not of interest in this context.

(15) The filter element 18 comprises a filter medium 22 which, relative to a virtual axis 20, continuously extends circumferentially and surrounds an element interior 24. When operating the filter 10, the filter element 18 is flowed through by the liquid from the exterior to the interior in radial direction so that the element interior 24 is the clean side of the filter element 18 and the interior of the filter housing 12 surrounding the filter element 18 is the raw side.

(16) When in the following “axial”, “radial”, “coaxial”, “circumferential” or the like is mentioned, this relates to the axis 20, if nothing else is mentioned. In the illustrated embodiment, the axis 20 coincides with an element axis of the filter element 18, an installation axis of the filter element 18 into the housing cover 14, a housing axis of the filter housing 12, and a connecting axis of a drainage closure element 26 of the drainage assembly 16 with the housing cover 14. For simplifying matters, in the following reference is therefore being had to the axis 20, respectively. It is understood that the axis 20 corresponds to the respectively aforementioned axes when the filter 10 is demounted.

(17) At an end face of the filter element 18, in FIG. 1 at the bottom and facing the drainage assembly 16, an end disc 28 is attached. The end disc 28 extends across the entire end face of the filter element 18. In the region of the element interior 24 the end disc 28 is axially stepped toward the element interior 24. The end disc 28 is provided there with a coaxial filter element drainage opening 30.

(18) At the outer side of the end disc 28 facing away axially from the element interior 24, the filter element drainage opening 30 is provided inside a positioning element 32.

(19) The positioning element 32 has the shape of a sleeve which has a circular cylinder shape at its radial inner circumferential side. At the radial outer circumferential side the positioning element 32 is toothed and forms thus in radial direction outwardly a plurality of circumferentially spaced-apart positioning sections 34 for a filter element seal 36. The positioning sections 34 extends respectively parallel to the axis 20.

(20) The filter element seal 36 is embodied as a sleeve in the form of a circular hollow cylinder which is coaxially arranged. With its radial inner circumferential side, the filter element seal 36 is resting, with circumferential interruptions, at the respective positioning sections 34 so as not to seal radially and is thereby positioned.

(21) At it's axially oppositely positioned end faces, the filter element seal 36 has a filter element seal surface 38, respectively. The filter element seal surfaces 38 each are exclusively axially oriented. The filter element seal 36 comprises therefore no sealing surface acting in radial direction.

(22) The filter element seal 36 projects past the positioning element 32 in axial direction. The filter element seal 36 is made of an elastomer and elastic at least an axial direction.

(23) With its filter element seal surface 38 facing axially the element interior 24, the filter element seal 36 is resting so as to act seal-tightly in axial direction at a filter element sealing surface 40. The filter element sealing surface 40 continuously surrounds circumferentially the positioning element 32 in radial direction outwardly at the outer side of the end disc 28 that is axially facing away from the element interior 24. The filter element sealing surface 40 is oriented also exclusively in axial direction.

(24) The drainage assembly 16 comprises the drainage closure element 26 and a receptacle 42 for the drainage closure element 26 which is arranged at the spatially lower part of the housing cover 14. The receptacle 42 is embodied as a whole as one piece together with the housing cover 14.

(25) The receptacle 42 comprises a coaxial connecting section 44 in the form of a circular cylindrical sleeve at the outer side of the housing cover 14. At its radial inner circumferential side, the connecting section 44 comprises an inner thread 46 of a screw connection 48 which interacts with a corresponding outer thread 50 at the radially outer circumferential side of the drainage closure element 26.

(26) At the inner side of the housing cover 14 which is facing axially the filter element 18, the receptacle 42 comprises a coaxial sealing section 52 in the form of a hollow circular cylinder. The sealing section 52 forms at its radially inner circumferential side a circumferential sealing surface 54 which is oriented inwardly in radial direction. At the environmental sealing surface 54 an environmental sealing ring 56 is resting so as to act sealingly in radial direction. The environmental sealing ring 56 is arranged in a sealing groove in the radially outer circumferential side of the drainage closure element 26.

(27) At the side which is facing away from the bottom of the housing cover 14 in axial direction, the sealing section 52 is bent by 90° radially inwardly and forms there an end wall 58. In the end wall 58, a plurality of radially outer drainage openings 60 are arranged and circumferentially distributed.

(28) Radially inwardly of the radially outer drainage openings 60, the end wall 58 is bent by 90° away from the bottom of the housing cover 14 and passes into a separating section 62. The separating section 62 has the shape of a coaxial hollow circular cylinder. The separating section 62 forms thus a circumferentially continuous separating wall. The separating section 62 surrounds a coaxial radially inner drainage opening 64. The separating section 62 separates in this way the radially outer drainage opening 60 from the radially inner drainage opening 64.

(29) In the region of its rim facing axially away from the end wall 58, the separating section 62 is widened in a funnel shape at the radially inner circumferential side. An axial expansion of the separating section 62 is smaller than an axial expansion of the filter element seal 36 in the relaxed state. Upon axial compression of the filter element seal 36, the separating section 62 can serve as a stop. An inner diameter of the separating section 62 is larger than an outer diameter of the filter element seal 36. With mounted filter element 18, the separating section 62 surrounds the filter element seal 36 without contacting it. In this way, no radial sealing action between the separating section 62 and the filter element seal 36 is taking place.

(30) The end face of the drainage closure element 26 which is axially facing the interior of the filter housing 12 extends flat and perpendicular to the axis 20. At its center, the end face comprises a conical coaxial centering element 66. The maximum outer diameter of the centering element 66 is smaller than the inner diameter of the filter element drainage opening 30. The centering element 66 can thus engage the filter element drainage opening 30 in order to center the filter element 18 accordingly.

(31) Radially outwardly of the centering element 66, the end face of the drainage closure element 26 forms a circumferentially continuous sealing surface 68. The sealing surface 68 corresponds in its diameter and its radial expansion to the corresponding facing, spatially lower filter element seal surface 38 of the filter element seal 36. The sealing surface 68 is oriented exclusively in axial direction. When the filter 10 is mounted, the filter element seal surface 38 of the filter element seal 36 is resting at the seal surface 68 so as to exclusively act sealingly in axial direction.

(32) Radially outwardly of the sealing surface 68, the end face of the drainage closure element 26 forms an annular cover surface 70 with which the radially outer drainage openings 60 are covered and closed when the filter 10 is mounted.

(33) A radially outer diameter of the end face of the drainage closure element 26 corresponds to a radially inner diameter of the seal section 52 of the receptacle 42.

(34) By means of the filter element seal 36, the clean side of the filter element 18 is separated from the raw side. The separating section 62 in combination with the labyrinth-type arrangement of the recess of the end disc 28 prevent that coarse dirt, for example, chips, can pass from the raw side into the region of the filter element seal 36 and impair its sealing action.

(35) For draining the liquid from the filter 10, for example, for servicing purposes, the drainage closure element 26 is moved out of the receptacle 42, for example, unscrewed. In doing so, the filter element seal 36 at the side which is facing the sealing surface 68 opens the connection between the filter element drainage opening 30 and the radially inner drainage opening 64 so that liquid can drain from the clean side.

(36) Also, the cover surface 70 releases the radially outer drainage openings 60 so that the liquid from the raw side can drain through the radial outer drainage openings 60.

(37) For exchange of the filter element 18, the housing cover 14 is unscrewed from the housing base body. Subsequently, the filter element 18 together with the filter element seal 36 can be pulled out of the housing cover 14 in axial direction and exchanged.

(38) The assembly of the filter 10 is done in reverse order.

(39) FIGS. 4 and 5 show a second embodiment of a filter 10. Those elements which are similar to those of the first embodiment of FIGS. 1 to 3 are provided with the same reference characters. The second embodiment differs from the first embodiment in that the positioning element 32 is fastened at the drainage closure element 26 associated with the housing instead of at the filter element 18. The positioning element 32 is realized in an exemplary fashion as one piece together with the drainage closure element 26. A centering element as it has been realized in the first embodiment on the part of the drainage closure element 26 with reference character 66 is not used in the second embodiment. The filter element seal 36 is detachably pushed onto the positioning element 32 associated with the housing.

(40) Moreover, in the second embodiment the separating section 62 is fastened at the filter element 18 instead of at the receptacle 42 at the housing. The separating section 62 is realized in an exemplary fashion as one piece together with the end disc 28.

(41) In FIGS. 6 and 7, a third embodiment of the filter 10 is illustrated. Those elements that are similar to those of the first embodiment of FIGS. 1 to 3 are provided with the same reference characters. The third embodiment differs from the first embodiment in that the positioning element 32 is fastened to the drainage closure element 26 associated with the housing instead of at the filter element 18. The positioning element 32 in an exemplary fashion is realized as one piece together with the drainage closure element 26. A centering element as it has been realized in the first embodiment on the part of the closure element 26 with reference characters 66 is not used in the third embodiment. The filter element seal 36 is detachably pushed onto the positioning element 32 associated with the housing.

(42) In FIGS. 8 and 9, a fourth embodiment of a filter 10 is illustrated. Those elements that are similar to those of the first embodiment of FIGS. 1 to 3 are provided with the same reference characters. The fourth embodiment differs from the first embodiment in that the separating section 62 is fastened at the drainage closure element 26 associated with the housing instead of at the receptacle 42. The separating section 62 is realized in an exemplary fashion as one piece together with the drainage closure element 26. Moreover, the radially inner circumferential side of the separating section 62 in cross section is provided with a corrugated profile 172. The radially inwardly positioned regions form a plurality of positioning sections 174. The positioning sections 174 serve as guide and contact of the radially outer circumferential side of the filter element seal 36. The regions between the positioning sections 174 extend in an exemplary fashion parallel to the axis 20. They form channels through which upon removal of the filter element 18 and release of the drainage assembly 16 the liquid contained in the element interior 24 can drain to the exterior into the housing cover 14. A separate centering element as has been realized in the first embodiment on the part of the drainage closure element 26 with reference character 66 is not used in the fourth embodiment.