FILTER ELEMENT, FILTER ELEMENT ARRANGEMENT, AND FILTER SYSTEM WITH A FILTER ELEMENT ARRANGEMENT

Abstract

A first filter element has a filter medium body for radial fluid flow therethrough and first and second end plates at opposed end faces of the filter medium body. A first engagement device extending axially parallel to a longitudinal axis of the filter medium body is arranged at the first end plate. A second filter element has a filter medium body and a seal device for radially sealing the second filter element in a filter housing. A fluid flow through the second filter element is perpendicular to a plane spanned by the seal device. The seal device has a second engagement device extending axially perpendicularly to the plane spanned by the seal device. The filter elements are axially joined to a filter element arrangement, wherein the first and second engagement devices engage each other. A filter system has such a filter element arrangement arranged in a filter housing.

Claims

1. A filter element comprising: a filter medium body comprising a wall configured to be flowed through by a fluid to be purified in a radial direction in relation to a longitudinal axis of the filter medium body, wherein the filter medium body comprises oppositely positioned end faces; a first end plate and a second end plate arranged at the oppositely positioned end faces of the filter medium body; at least one engagement means extending in an axial direction parallel to the longitudinal axis and arranged at an end face of the first end plate, wherein the at least one engagement means is configured to contact a further filter element to be arranged adjacent to the first end plate in the axial direction.

2. The filter element according to claim 1, wherein the first end plate is a closed end plate.

3. The filter element according to claim 1, wherein the at least one engagement means is a recess.

4. The filter element according to claim 3, wherein the recess is arranged in a rim region of the first end plate.

5. The filter element according to claim 1, wherein the filter medium body is embedded in a region of the first end plate, wherein the at least one engagement means is arranged in said region of the first end plate.

6. A filter element comprising: a filter medium body; a seal device configured to radially seal the filter element in relation to a filter housing; wherein a flow direction of a fluid to be filtered through the filter medium body is positioned perpendicularly to a plane spanned by the seal device; wherein the seal device comprises at least one engagement means extending in an axial direction perpendicularly to the plane spanned by the seal device.

7. The filter element according to claim 6, wherein the seal device comprises a region outside of the filter medium body, wherein the at least one engagement means is arranged in said region of the seal device outside of the filter medium body.

8. The filter element according to claim 6, wherein the seal device comprises a plate with a circumferentially extending seal.

9. The filter element according to claim 6, wherein the at least one engagement means is a pin.

10. The filter element according to claim 6, wherein the at least one engagement means comprises a demounting aid.

11. A filter element arrangement comprising: a first filter element comprising: a first filter medium body comprising a wall configured to be flowed through by a fluid to be purified in a radial direction in relation to a longitudinal axis of the first filter medium body, wherein the first filter medium body comprises oppositely positioned end faces; a first end plate and a second end plate arranged at the oppositely positioned end faces of the first filter medium body; at least one first engagement means extending in an axial direction parallel to the longitudinal axis and arranged at a first end face of the first end plate; a second filter element comprising: a second filter medium body; a seal device configured to radially seal the second filter element in relation to a filter housing; wherein a flow direction of a fluid to be filtered through the second filter medium body is positioned perpendicularly to a plane spanned by the seal device; wherein the seal device comprises at least one second engagement means extending in the axial direction perpendicularly to the plane spanned by the seal device; wherein the at least one first engagement means and the at least one second engagement means engage each other.

12. The filter element arrangement according to claim 11, wherein, when the first and second filter elements are joined, the first end face of the first end plate is spaced apart at a clearance from a second end face of the second filter element facing the first end face of the first end plate.

13. A filter system comprising: a housing; a filter element arrangement according to claim 11 exchangeably arranged in the housing.

14. The filter system according to claim 13, wherein the housing comprises a housing part comprising at least one housing engagement means, wherein the second filter element is configured to be mounted on the at least one housing engagement means.

15. The filter system according to claim 14, wherein the second filter element is configured to be pushed on the at least one housing engagement means or inserted into the at least one housing engagement means.

16. The filter system according to claim 14, wherein the at least one second engagement means of the seal device of the second filter element and the at least one housing engagement means engage each other.

17. The filter system according to claim 16, wherein the at least one housing engagement means is a pin extending in the axial direction and engaging an opening of the at least one second engagement means of the seal device of the second filter element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Further advantages result from the following drawing description. In the drawings, embodiments of the invention are illustrated. The drawings, the description, and the claims contain numerous features in combination. A person of skill in the art will consider the features expediently also individually and combine them to expedient further combinations.

[0042] FIG. 1 shows in perspective view a filter system in exploded illustration according to an embodiment of the invention.

[0043] FIG. 2 shows in a longitudinal section the filter system according to FIG. 1 in exploded illustration.

[0044] FIG. 3 shows a detail view of a filter arrangement in a partially sectioned housing according to FIG. 1.

[0045] FIG. 4 shows a detail view of the filter arrangement according to FIG. 3.

[0046] FIG. 5 shows a longitudinal section of the filter system according to FIG. 1 with filter element inserted in the housing in end position.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0047] In the Figures, same or same-type components are identified with same reference characters. The Figures show only examples and are not to be understood as limiting.

[0048] In order to explain the invention, FIG. 1 shows, in perspective view, an embodiment of a filter system 400 with a first and a second filter element 100, 200 in a housing 10 in exploded illustration, while FIG. 2 shows the filter system 400 illustrated in exploded illustration in a longitudinal section. FIG. 3 shows a detail view of the filter element arrangement 300 of the filter elements 100, 200 in partially sectioned housing 10, and FIG. 4 shows a detail view of the filter element arrangement 300 according to FIG. 3.

[0049] The filter system 400 serves, for example, for gas filtration, in particular for air filtration. The filter system 400 comprises a housing 10 with a first housing part 12 and a second housing part 14. The first housing part 12 is configured here as a hood and comprises a fluid inlet 24 in this example. The second housing part 14 is configured here as a housing pot and comprises at the bottom a socket 16 which comprises a fluid outlet 26.

[0050] In the housing 10, a filter element arrangement 300 is arranged in the flow path of the fluid, with a first filter element 100 which forms a main element, and a second filter element 200 which forms a secondary element. The filter elements 100, 200 are arranged following each other in longitudinal direction 50. Both filter elements 100, 200 can be provided so as to be exchangeably arranged.

[0051] The first filter element 100 is embodied as a round filter element with a closed filter medium body 102 of a filter medium and comprises in the longitudinal direction 50 an oval cross section, for example. The cross section can decrease beginning at an end plate 150 in direction toward the end plate 160 so that the first filter element 100 tapers conically. Preferably however, the first filter element 100 comprises an oval or elliptical cross section. The first filter element 100 comprises an oval base surface. Alternatively, the cross section can have a rectangular cross section with rounded corners, an elliptical cross section, or a cross section which is formed of a plurality of circular arcs. The first filter element 100 can comprise a central tube which delimits an interior space 120 of the first filter element 100.

[0052] The filter medium of the filter medium body 102 is folded, for example, such that the outer fold edges are lying in an outer circumferential surface and inner fold edges in an inner circumferential surface. The fold ends are embedded in the respective end plates 150, 160.

[0053] The end plates 150, 160 can be fused, glued or welded to the filter medium.

[0054] The open end plate 150 of the first filter element 100 can be clamped stably between the first housing part 12 and the second housing part 14 when the first housing part 12 is connected to the second housing part 14. The end plate 150 is seated on a shoulder 18 of the second housing part 14 and, in this context, radially and/or axially seals with a circumferential collar 152 raw side relative to clean side.

[0055] The end plate 150 of the first filter element 100 is of an open configuration and is arranged, for example, as a ring of foamed polyurethane (PUR) at the filter medium body 102. The end plate 160 is closed fluid-tightly. The end plate 160 can be formed of plastic material, for example, of PUR.

[0056] At an outer end face 162 of the end plate 160 of the first filter element 100, two engagement means 110 extending in axial direction parallel to the longitudinal axis 50 are provided. The engagement means 110 are embodied as recesses in the end plate 160 and arranged in the rim region 164 thereof in a region where the filter medium or the filter medium body 102 is embedded.

[0057] The interior 120 of the first filter element forms in this example the raw side of the filter element 100. The fluid to be purified flows through the fluid inlet 24 of the first housing part 12 into the first filter element 100 and passes radially through the filter medium body 102 into the outer region of the filter element 100.

[0058] The second filter element 200 is configured as a flat filter with a filter element body 202 which, for example, is folded and is arranged on a seal device 204. The seal device 204 comprises a plate 216 surrounded by a seal 218 extending circumferentially about the rim so that the second filter element can be sealed radially in relation to the housing 10. Outer fold edges of the filter medium are lying in an end face 212 which is facing the first filter element 100, while the inner fold edges adjoin the plate 216. The filter medium can be over-molded or can be sealed by a strip.

[0059] The seal device 204 of the second filter element 200 comprises two second engagement means 210 in the form of pins extending in axial direction perpendicularly to a plane 208 spanned by the seal device 204, wherein the engagement means 110 of the first filter element 100 and the engagement means 210 of the second filter element 200 engage each other when the two filter elements 100, 200 are joined as a filter element arrangement 300.

[0060] The engagement means 210 are arranged in a region 206 of the seal device 204 outside of the filter medium body 202. The plate 216 comprises a plurality of openings so that the filter medium body 202 can stably rest thereon and fluid can flow through the filter medium body 202 and the plate 216.

[0061] The pin-shaped engagement means 210, as can be seen in FIGS. 3 and 4, are of a hollow configuration so that the pin-shaped housing engagement means 22 at the bottom of the housing part 14 of the housing 10 can engage an opening 214 at their base.

[0062] The pin-shaped engagement means 210 of the second filter element 200 comprise at their circumference a demounting aid 220 embodied as a cutout so that the second filter element 200, as needed, can be pulled off the housing engagement elements 22, for example, when exchanging the second filter element 200.

[0063] The fluid to be purified enters the filter system 400 and the interior 120 of the first filter element 100 through a fluid inlet 24, flows radially through the filter medium body 102 of the filter element 100 into the external space between housing and filter medium body 102, through the free space formed by the clearance 302 to the second filter element 200, and flows through its filter medium body 202 to the fluid outlet 26 in the socket 16.

[0064] FIG. 5 shows a longitudinal section of the filter system 400 according to FIG. 1 with filter elements 100, 200 inserted in end position in the housing 10.

[0065] The second filter element 200 has been inserted all the way to the bottom of the second housing part 14 of the housing 10 and is seated on a shoulder of the housing part 14 above the socket 16 comprising the fluid outlet 26 and seals with its seal 218, circumferentially surrounding the plate 216 of the seal device 204, in relation to the inner side of the housing part 14. In this context, the second filter element 200 is fixedly seated with its engagement means 210 stably on the pin-shaped housing engagement means 22 at the bottom of the housing 10. The housing engagement means 22 guide the second filter element 200 upon insertion into the housing 10 and fix the second filter element 200 in operation of the filter system 400.

[0066] The first filter element 100 is placed on top of the second filter element 200. The engagement means 210 of the second filter element 200 engage in this context in the engagement means 110 of the first filter element 100 embodied as recess. When the first and second filter elements 100, 200 are joined in the end position in the housing 10, the end face 162 of the end plate 160 is spaced apart in relation to the second end face 212 of the second filter element 200 at a clearance 302.

[0067] The second filter element 200 supports in this context the first filter element by means of the engagement means 210 and, due to its stable fixation at the housing engagement means 22, reliably prevents movements of the first filter element 100, even in case of vibrations in operation of the filter system 400.