Filter element and filter device for receiving filter element

Abstract

The utility model relates to a filtering element and filtering equipment for containing the filtering element, the filtering element is provided with an element material (22), the element material comprises a cavity (26) which is particularly in the form of a filtrate chamber and extends between two end covers (28, 30) which are arranged on the end sides, the end covers are respectively provided with sealing devices (32, 34), and the sealing devices (32, 34) are arranged on the element material. Wherein one sealing device (32) preferably has a polygonal opening cross-section and the other sealing device (34) has a preferably circular opening cross-section, and the one sealing device (32) is part of a spherical bearing (44).

Description

TECHNICAL FIELD

[0001] The utility model relates to a filter element, the filter element has element material, the element material includes the cavity especially the form is filtrate chamber, and extends between two end covers arranged at the end side, the end cover has sealing device respectively. BACKGROUND

[0002] It is known from DE 102018009187 A1 a filter device with a filter housing and a filter element accommodated therein, the element material of the filter element extending between two end covers, wherein at least one end cover is supported on an element receptacle by means of a spherical bearing, which bearing provides more than one degree of freedom, with the aim of hingedly supporting the filter element on the element receptacle via one of its end covers. Thereby, a compensation possibility for possible misalignments is provided, so that a reduction of the narrow tolerance limits to be maintained for the manufacture can be achieved and thereby the filter device can also be manufactured reliably and with advantageous manufacturing costs with a long configured filter element or with an assembled filter housing.

[0003] In the known solution, the filter element is fixedly secured in the working position with its lower end cover via a thread constituting a sealing portion in a receptacle on the housing side and is guided on the housing head of the filter housing with longitudinal mobility on a spigot-shaped element receptacle on its other, opposite end cover by means of an O-ring seal.

[0004] The associated filter device together with its filter element is subjected to partial very strong loads in harsh everyday operation, for example when such a solution is used in the range of hydraulic hammer operation, wherein the filter element is usually loaded by strong hydraulic pulsations. By fixing one of the end portions of the filter element immovably in the housing via a thread in the known solution, strong pulsations occurring in hammer operation, together with the high force differences resulting therefrom on the filter element, can completely damage the filter element. SUMMARY

[0005] Therefore, starting from this prior art, it is the task of the utility model to further improve the known filter element solution in relation, so that an undisturbed operation can be achieved even when the filter element is strongly loaded, in particular when hydraulic pressure pulsations occur.

[0006] To this end, the utility model provides a filter element, the filter element has element material, the element material includes cavity and extends between two end covers arranged at the end side, the end cover has sealing device respectively, one sealing device and another sealing device have different opening cross sections, and one sealing device is part of a spherical support, possible offset errors can be always compensated via the spherical support and in addition such an inwardly "open" end cover on the element is formed via the free opening cross section of the corresponding sealing device, which leads to a reduction of the differential pressure surface on the element, unlike in the known case when one end cover is open and the other end cover is closed. By the open end cover configuration, possible forces in the axial direction of the element are significantly minimized, so that a failure-free operation can be achieved even in the event of high loads. Therefore, there is no corresponding solution in the prior art. By the different opening cross sections, preferably one polygon and one circle, possible incorrect installation is prevented when replacing the element with a new element, because there is only one reliable installation possibility and in addition a forgery protection is achieved, both of which are advantageous for a functionally reliable operation.

[0007] In a preferred embodiment of the filter element according to the utility model, it is provided that the cavity is in the form of a filtrate chamber.

[0008] In a preferred embodiment of the filter element according to the utility model, it is provided that the opening cross section of the one sealing device is polygonal.

[0009] In a preferred embodiment of the filter element according to the utility model, it is provided that the opening cross section of the other sealing device is circular.

[0010] Here, it is provided in a particularly advantageous manner that the two sealing devices each have a sealing surface on the inner periphery side, which sealing surfaces coincide with each other in an assumed projection parallel to the longitudinal axis of the filter element. In the associated design, possible differential pressure surfaces are then further minimized, so that forces occurring in the range of operation can never damage the filter element and in particular the element material.

[0011] In another particularly preferred embodiment of the filter element according to the utility model, it is provided that the spherical support has two housing parts, one of which is fixedly accommodated on one of the end covers, and the other housing part having the one sealing device is pivotably accommodated in the one housing part. In this way, also larger tolerances can be compensated and larger geometric deviations from the one end cover to the other end cover are possible, so that it is no longer mandatory to maintain very narrow manufacturing tolerances, which contributes to a reduction in manufacturing costs.

[0012] In the context of the related design it is preferred to provide that the one sealing device has an annular groove on the outer peripheral side, and that the other housing part is inserted with an inner edge into the annular groove. In this way, a multi-part construction of the spherical bearing is achieved with the one sealing device, so that this sealing device can easily be replaced with a new sealing device in the event of failure of the related sealing device.

[0013] In another preferred embodiment of the filter element according to the application it is provided that the one sealing device of polygonal shape is configured on the inner peripheral side as a regular polygon, preferably a quadrangle, that between the thus configured and rounded-off corner points the individual wall sections project convexly outward with the same curvature, and that preferably the greatest curvature of one of the wall sections is smaller than the smallest curvature of one of the rounded-off corner points. In this way, the sealing device of polygonal shape is configured particularly self-stable and can reliably accept forces in the radial transverse direction without being influenced in the sealing effect.

[0014] Here, it is preferred that the one sealing device has a sealing surface extending flat on the inner peripheral side, which sealing surface leads in the direction of the longitudinal axis of the filter element in the end side along an inclined portion. In this way and method, a defined central sealing surface is generated, which seals without being over-dimensioned in the sealing effect by other components of the sealing device.

[0015] In another preferred embodiment of the filter element according to the application, the other sealing device is configured by an O-ring, which O-ring is preferably enclosed, in particular surrounded, by the plate part of the other end cap, except for the exposed sealing surface. Thus, both sealing devices are designed in such a way that they are guided longitudinally movably along a guide, so that the element can be placed in the appropriate, as force-free as possible position along the guide depending on the pressure situation.

[0016] The application further relates to a filter device for accommodating a filter element as set forth above, in which a guide having a cylindrical outer peripheral surface is accommodated in a housing part of a filter housing, usually in the form of a filter head, for abutment against the one sealing device, and another guide having a cylindrical outer peripheral surface is accommodated in another housing part, usually in the form of a filter pot, which can be connected detachably to the housing part, for abutment against the other sealing device. In this way, a self-stable positioning of the filter element with respect to the housing parts of the filter device by means of the guides is achieved.

[0017] It is preferred here that the one guide consists of a sleeve, the one sealing device is guided longitudinally along the outside of the sleeve, and the other guide consists of a pot-shaped insert, which can be latched with the other housing part in a manner configured as a locking element, and the outer peripheral surface of which forms a longitudinal guide for the other sealing device. Via the corresponding sleeve and the pot-shaped insert, a fluid flow that is as free of turbulence as possible can be guided through the filter housing for filtering with the filter element. BRIEF DESCRIPTION OF DRAWINGS

[0018] The solution according to the application is explained in detail below with the aid of embodiments with reference to the drawings. In the diagrammatic and not to scale drawings of the principle:

[0019] Figure 1 Perspective view showing a longitudinal section of the filter device;

[0020] Figure 2 , Figure 3 Area of the head side or the bottom side of the filter device according to Figure 1 ;

[0021] Figure 4 Spherical bearing arrangement of the filter element according to Figure 1 and Figure 2 ; and

[0022] Figure 5 Perspective view of the sealing device for the filter element in the area of the spherical bearing according to Figure 1 , Figure 2 and Figure 4 . DETAILED DESCRIPTION

[0023] Figure 1 A longitudinal section of the filter device is shown as a whole. The filter device according to Figure 1 has a filter head 10 and a filter pot 12, which can be detachably screwed to the filter head 10 in a known manner. The filter device according to Figure 1The filter device is shown in its usual vertical operating position and the filter head 10 is permanently flow-conducting connected in a fixed manner to a hydraulic supply circuit (not shown). Furthermore, the filter head 10 has an inlet opening 14 for the unfiltered fluid flow and an outlet opening 16 for the filtered fluid flow. Both the inlet opening 14 and the outlet opening 16 are connected in a usual manner to the mentioned hydraulic supply circuit. Between the inlet opening 14 and the outlet opening 16 a spring-loaded bypass valve 18 is connected, which opens when the filter element in the filter device is clogged or blocked and connects the inlet opening 14 directly with the outlet opening 16 bypassing the filter element, so that the fluid flow within the supply circuit is not interrupted. The relevant construction is usual in such filter devices, so that here it is not explained in more detail.

[0024] The filter head 10 and the filter canister 12 are both constructed as components of a filter housing 20, in which the filter element is accommodated. The filter element is provided in a usual manner with an element material 22, which is preferably implemented in a pleated manner in order to enlarge its filter surface. The element material 22 is supported on its inner side on a perforated support tube 24 and in this respect comprises a cavity 26, which is also called in the professional terminology as filtered fluid chamber. Furthermore, the element material extends between two end caps 28, 30, which have sealing means 32, 34, respectively. The filter element accommodated in the filter device has a radial spacing relative to the inner peripheral side of the filter housing 20, so that the relevant inner peripheral side and the outer peripheral side of the filter element delimit each other within the filter housing 20 an unfiltered fluid chamber 36, which is connected via a channel-like fluid connection 38 in the filter head 10 to the inlet opening 14 in the direction of the filter head 10. Inversely, the filtered fluid chamber 26 is connected to the outlet opening 16 for the filtered fluid flow, a relevant further fluid connection 39 leading past the bypass valve 18. Thus, the element material 22 is flowed through from the outside to the inside in the viewing direction and reliably cleaned of particle contaminants possibly present in the fluid flow by the element material 22. Figure 1

[0025] As is shown in particular Figure 5 in the drawing, one of the sealing means 32 is implemented with a polygonal open cross section 40 and the other sealing means 34 delimits a circular open cross section 42, in particular according to the drawing of Figure 3 As is shown in particular Figure 4 in the drawing, one of the sealing means 32 is implemented with a polygonal open cross section 40 and the other sealing means 34 delimits a circular open cross section 42, in particular according to the drawing of Figure 1 ​As a result, the two sealing devices 32, 34 each have inner peripheral sealing surfaces 46, 48, which coincide with each other when viewed in a hypothetical cylindrical projection parallel to the longitudinal axis of the filter element. This minimizes the effective differential pressure surface and achieves a largely force-free support of the filter element within the filter housing 20 of the filter device.

[0026] As from Figure 4 As shown, the ball bearing 44 has two housing parts 50, 52, wherein one housing part 50 is fixedly received on the one end cap 28 and the other housing part 52 with the one sealing device 32 is pivotally received in the one housing part 50. Figure 4 Along the sleeve 54 is received in the filter head 10 (as this further from Figure 2 (The results show that the further housing part 52 is fixed in position relative to the filter head 10 in the radial direction, so that the one housing part 50 can be guided in an articulated manner with more than one degree of freedom along the convex outer peripheral side of the further housing part 52. In this regard, the convex outer peripheral surface of the further housing part 52 abuts the correspondingly concave inner peripheral side of the one housing part 50. In this regard, the filter element with its element material 22 is then pivotably arranged on the further housing part 52 in different angular directions relative to the longitudinal axis of the filter element, and any misalignment errors can be compensated in this way.

[0027] The one sealing device 32 has an annular groove 56 on the outer circumference side, and the other housing part 52 is provided according to Figure 4 The end cap 28, shown in the figure, engages in the annular groove with its protruding inner edge 58. The one-piece end cap 28 has a sleeve-shaped delimiting wall 60 at the bottom, which protrudes into the filtrate chamber 26 with a predeterminable projection and, more precisely, into this region at a predeterminable radial distance from the inner circumference of the support tube 24. In this regard, the end cap 28, with its cylindrical outer edge and inner delimiting wall 60, forms a pot-shaped receiving space for an adhesive bed 62 (not shown in detail), which serves to secure the end cap 28 to the free end ends of the element material 22 and the support tube 24.

[0028] If further from Figure 4 and Figure 5As emerges, the sealing means 32 of the polygonal shape is configured on the inner peripheral side as a quadrangle with four corner regions 64, between which the respective wall portions 66 extend convexly outwardly with the same curvature. The associated sealing ring with the polygonal cross section of the opening has on the inner peripheral side in the manner of the corner regions 64 and the wall portions 66 a sealing face 68 which extends substantially flat as an annular ring, which is led along inclined portions 70, 72 on the end side in the direction of the assumed longitudinal axis of the filter element. By means of the inclined portions 70, 72, the actual sealing face 68 is "cut off" and in this respect is configured as a sliding face in a sealing manner for the sliding along the outer peripheral side of the sleeve 54 on the head side, which is derived in particular from the illustration according to Figure 2 .

[0029] In this way, the upper end cap 28 is guided axially moveably along the sleeve 54 via the spherical bearing 44 and the one sealing means 32 and is correspondingly supported in the radial direction. Here, in any case, the sleeve 54 is received immovably in the filter head 10 in the head-side interspace which is part of the further fluid guide 39. In this respect, the sleeve 54 is configured as a guide 74 along the outer side of which the sealing means 32 is guided longitudinally moveably. The further sealing means is configured according to the illustration according to Figure 3 by an elastomer O-ring 76 which is enclosed by a plate piece 78 of the further end cap 30 except for the sealing face 48 which is exposed inwardly. In this respect, the associated further end cap 30 is configured as a plate-shaped piece and has again a sleeve part 80 which projects in the direction of the filtrate chamber 26 and serves together with the annular outer wall of the end cap 30 for receiving a further adhesive bed 82 (not shown) with which the element material 22 and the lower end region of the support tube 24 can be fixedly secured on the further end cap 30. In this lower end region of the filter element, there is also a further guide 84 which is configured as a pot-shaped insert 86 which is latched on the bottom side in the manner of a locking piece with the further housing piece in the form of the filter pot 12. The pot-shaped insert 86 has on the outer peripheral side again a cylindrical, itself closed outer peripheral face 88 which constitutes a longitudinal guide for the illustrated further sealing means 34 with the O-ring 76. As emerges from Figure 1 the illustration, on both opposite sides of the filter element, this filter element is guided axially moveably along the respective guide 74, 84 by means of the two sealing means 32, 34, so that the filter element can be positioned independently supportlessly within the filter housing 20 according to the force of the pressure loading.

[0030] In order to avoid a better discharge of oil when emptying the filter tank 12, the further guide 84 has a circular recess 85 on the bottom side; however, since the tank-like further guide 84 is implemented closed in the direction of the filtrate chamber 26, no unfiltered liquid can reach the filtrate side in this area, unless the element material 22 of the unfiltered flow-through element also passes through the support tube 24, which forms a common filter operation.

[0031] With the solution according to the application, its use in the so-called hammer operation can also be easily realized, in which the filter element is hydraulically strongly loaded by pulsations. By means of the two open-ended end caps 28, 30 on the filter element, there is the possibility of significantly minimizing the effective differential pressure surface and thus the force in the axial direction. For this purpose, the two end caps 28, 30 must be reliably sealed, which can be easily realized by means of the mentioned sealing means 32, 34. Since the one sealing means 32 is clamped with the spherical seat 44 of the one end cap 28 and the O-ring 76 of the other sealing means 34 is guided in the sheet metal part 78 of the other end cap 30, the sealing means 32, 34 do not need to be glued, which correspondingly makes the manufacture of the filter element easy and low-cost.

Claims

1. A filter element comprising an element material (22) which comprises a cavity (26) and extends between two end caps arranged at the end sides, each of which has a sealing device, characterized in that: One of the sealing devices (32) and the other sealing device (34) have different opening cross sections, and the one sealing device (32) is part of a spherical seat (44).

2. The filter element according to claim 1, characterized in that The cavity (26) is in the form of a filtrate chamber.

3. The filter element according to claim 1, characterized in that The opening cross section of the sealing device (32) is polygonal.

4. The filter element according to claim 1, characterized in that The opening cross section of the other sealing device (34) is circular.

5. The filter element according to claim 1, characterized in that The one sealing device (32) and the other sealing device (34) each have inner peripheral sealing surfaces (46, 48) which coincide with one another when viewed in a hypothetical projection parallel to the longitudinal axis of the filter element.

6. The filter element according to any one of claims 1 to 5, characterized in that The spherical bearing (44) has two housing parts, one housing part (50) is fixedly received on one of the end caps (28), and the other housing part (52) having the one sealing device (32) is pivotally received in the one housing part (50).

7. The filter element according to any one of claims 1 to 5, characterized in that The one sealing device (32) has an annular groove (56) on its outer circumference, into which the other housing part (52) engages with its inner edge (58).

8. The filter element according to any one of claims 1 to 5, characterized in that The polygonal sealing device (32) is designed as a regular polygon on the inner peripheral side; between the corner areas (64) designed in this way and extending in a rounded manner, individual wall parts (66) protrude convexly outwards with the same curvature.

9. The filter element according to claim 8, characterized in that The regular polygon is a quadrilateral.

10. The filter element according to claim 8, characterized in that The maximum curvature of one of the wall portions (66) is smaller than the minimum curvature of one of the rounded corner portions (64).

11. The filter element according to any one of claims 1 to 5, characterized in that The one sealing device (32) has a flat sealing surface (68) on the inner circumference, which extends along an inclination (70, 72) at the end side, as seen in the direction of the longitudinal axis of the filter element.

12. The filter element according to any one of claims 1 to 5, characterized in that The further sealing device (34) is formed by an O-ring (76).

13. The filter element according to claim 12, characterized in that The O-ring (76) is encircled by a plate member (78) of the other end cover (30).

14. The filter element according to claim 12, characterized in that The O-ring (76) is surrounded by a sheet metal part (78) of the other end cap (30) except for the exposed sealing surface (48).

15. A filter device for accommodating a filter element according to any one of claims 1 to 14, characterized in that A guide member (74) having a cylindrical outer circumference is accommodated in a housing part (10) of a filter housing (20) for contact with the one sealing device (32), and another guide member (84) having a cylindrical outer circumference is accommodated in another housing part (12) that can be detachably connected to the housing part (10) for contact with the other sealing device (34).

16. The filtering device according to claim 15, characterized in that The one guide part (74) is formed by a sleeve (54), the one sealing device (32) is guided longitudinally displaceably along the outer side of the sleeve, and the other guide part (84) is formed by a pot-shaped insert (86), which can be locked with the other housing part (12) in a manner configured as a locking part, and the outer circumference (88) of the insert forms a longitudinal guide for the other sealing device (34).

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