Seal arrangement for a filter, in particular a compressed air filter, and filter element for a filter

Patent metadata

Field	Value
Publication number	US-12138571-B2
Application number	US-202017763530-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Sep 25, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A seal arrangement for a filter for fluid-tight sealing between a filter element and a filter head includes an annular elastic seal, a filter head sealing face and a filter element sealing face. The seal has a filter head side facing the filter head sealing face, a filter element side facing the filter element sealing face, an inner face running circumferentially on the inner side, and an outer face running circumferentially on the lateral side. The filter head side has a circumferential first recess between the inner and outer faces. The filter element side has a circumferential second recess between the inner and outer faces. The seal arrangement is configured in such a way that the seal, when subjected to a pressure from the inner face and/or from the outer face, is wedged in the direction of the acting force, between part faces of the sealing faces that narrow toward the middle.

First claim

The invention claimed is:

1. A seal arrangement for a filter for the fluid-tight sealing between a filter element and a filter head, comprising an annular, elastic sealing member, the sealing member being an axially acting seal that seals substantially by way of axially acting forces,
wherein the sealing member has a filter head side that faces the filter head, an opposite filter element side, an internal face encircling the inside, and an opposite external face encircling the outside,
wherein the filter head side has an encircling first concavity between the internal face and the external face, and the filter element side has an encircling second concavity between the internal face and the external face,
wherein a filter head sealing face and a filter element sealing face are provided,
wherein the filter head side seals at least in regions on the filter head sealing face, and the filter element side seals at least in regions on the filter element sealing face, and
wherein the filter head sealing face and the filter element sealing face are each composed of at least one encircling inner partial face and one encircling outer partial face.

2. The seal arrangement of claim 1 , wherein the partial faces of the filter head sealing face and the partial faces of the filter element sealing face ascend toward the middle between the partial faces in such a manner that the mutual spacing between the inner partial faces decreases from the inside to the outside and the spacing of the outer partial faces decreases from the outside to the inside.

3. The seal arrangement of claim 1 , wherein the partial faces interact with the concavities in such a manner that, when impinged with pressure, the sealing member, proceeding from the internal face and/or the external face, in the direction of the acting force is wedged between the inner partial faces and/or the outer partial faces.

4. The seal arrangement of claim 1 , wherein the sealing fit between the partial faces and the concavities is reinforced when there is a pressure difference between the internal face and the external face as a result of the interaction between the applied force and the wedge effect.

5. The seal arrangement of claim 1 , wherein the sealing member on the filter head side has an encircling retaining groove for receiving a retaining element, wherein the retaining element is designed in such a manner that, when interacting with the retaining groove, a releasable latching connection is created.

6. The seal arrangement of claim 1 , wherein the second concavity extends at least over half of the width of the filter element side between the internal face and the external face and/or the first concavity extends at least over half of the width of the filter head side between the internal face and the external face.

7. The seal arrangement of claim 1 , wherein the sealing member in an encircling sub-region of the second concavity does not bear on the filter element sealing face.

8. The seal arrangement of claim 5 , wherein the retaining element and the retaining groove are designed in such a manner that there is a seal seat between the base of the retaining groove and the region of the retaining element that is closest to the filter element sealing face.

9. The seal arrangement of claim 5 , wherein the latching connection is formed by a unilateral extension on the retaining element and a corresponding recess in the sealing member toward a central axis of the sealing member.

10. The seal arrangement of claim 1 , wherein the sealing member has a hardness between 60 Shore A and 80 Shore A.

11. The seal arrangement of claim 1 , wherein the partial faces of the filter head sealing face and/or of the filter element sealing face in the radial direction toward the central axis are at a mutual internal angle α of less than 180°.

12. The seal arrangement of claim 1 , wherein the filter head side of the sealing member has two annular encircling partial sealing faces, between which the retaining groove extends into the sealing member, and both partial sealing faces in the radial direction to the central axis are at an external angle α 1 of less than 180°.

13. The seal arrangement of claim 1 , wherein in the non-assembled state the second concavity in the direction of the central axis has a greater depth than the extent of the partial faces in the direction of the filter head, wherein the height offset of the partial faces is less than 70% of the depth of the second concavity.

14. The seal arrangement of claim 1 , wherein the seal arrangement is configured for use in a filter, the filter element of said filter to the filter head taking place along an assembly axis which runs parallel to, or is identical to, the central axis of the sealing member.

15. The seal arrangement of claim 1 , wherein the seal arrangement is embodied in such a manner that the internal face and the external face of the sealing member come to bear neither on the filter head nor on the filter element so that the sealing member only seals axially in relation to a central axis of the sealing member.

16. The seal arrangement of claim 1 , wherein the sealing member seals in relation to the filter head sealing face and in relation to the filter element sealing face substantially by way of axially acting forces so as to seal predominantly in the axial direction.

17. A filter element having a seal arrangement for the fluid-tight sealing between the filter element and a filter head, the seal arrangement comprising an annular, elastic sealing member, wherein the sealing member has a filter head side that faces the filter head, an opposite filter element side, an internal face encircling the inside, and an opposite external face encircling the outside,
wherein the filter head side has an encircling first concavity between the internal face and the external face, and the filter element side has an encircling second concavity between the internal face and the external face,
wherein a filter head sealing face and a filter element sealing face are provided,
wherein the filter head side seals at least in regions on the filter head sealing face, and the filter element side seals at least in regions on the filter element sealing face,
wherein the filter head sealing face and the filter element sealing face are composed of at least one encircling inner partial face and one encircling outer partial face, and
wherein the filter element sealing face is set back in relation to an end side of the filter element.

18. The filter element of claim 17 , wherein the filter element has a substantially tubular body,
wherein the end side of the filter element is annular and faces a filter head,
wherein the filter element has an lower side which faces away from the filter head and is spaced apart from the end side,
wherein the filter element has a circumferential face which extends along a central axis, with the circumferential face connecting the end side and the lower side to one another,
wherein the circumferential face in the region adjoining the end side has a plurality of extensions running radially to the central axis, which form holding arms,
wherein the filter element sealing face is set back on the inner diameter of the end side and is likewise annular, and
wherein the holding arms project in relation to the end side and the filter element sealing face is designed for contact with a sealing member.

19. The seal arrangement of claim 17 , wherein the end side is formed by an encircling collar projecting in relation to the filter element sealing face.

Assignees

• Sata Gmbh & Co Kg

Inventors

• Maier Norbert
• Horstman Martin
• Schulze Sven

Classifications

• B01D2201/342

  Axial sealings · CPC title

• B01D2271/022

  Axial sealings · CPC title

• B01D46/2414 Primary

  End caps including additional functions or special forms · CPC title

• B01D35/303

  the housings being modular, e.g. standardised · CPC title

• B01D29/114

  arranged for inward flow filtration (B01D29/15, B01D29/33 take precedence) · CPC title