Filter element and filter device

Abstract

The utility model relates to a filtering element and filtering equipment, the filtering element at least comprises an element material (26), the element material extends between two end covers (28, 30), at least one end cover (30) is provided with a containing part (44) used for containing the element material (26) and a connecting part (52) used for being connected to a shell part (16), and the containing part (44) is used for containing the element material (26). The receiving part (44) and the connecting part (52) both have through-openings (56, 58) for the passage of a fluid on the inner circumferential side, which through-openings are arranged offset from one another with respect to a longitudinal axis (22) of the filter element (20), characterized in that an offset step (54) is arranged between the receiving part (44) and the connecting part (52), according to the invention, the filter element (20) has an offset step (54) which likewise has a through-opening (60), and the free cross-sections of the through-openings (56, 58, 60) of the receiving part (44), the connecting part (52) and the offset step (54) are the same, which each perpendicularly passes through the longitudinal axis (22) of the filter element (20).

Description

Technical Field

[0001] This invention relates to a filter element comprising at least an element material extending between two end caps, wherein at least one end cap has a receiving portion for receiving the element material and a connecting portion for connecting to a housing component. Both the receiving portion and the connecting portion have through openings on their inner circumferential sides for fluid penetration, the through openings being offset relative to the longitudinal axis of the filter element. This invention also relates to a filtration device. Background Technology

[0002] According to EP2490784B1, a filter element for use in an associated filter device is known, the filter element having an end cap at at least one end forming a frame for a related end edge for filter material, the end cap being fixable to an element receiving portion at the bottom of a filter housing for fixing the filter element in a functional position, the end cap having a structural irregularity on a portion of the end cap that engages with a portion of the element receiving portion in the associated filter housing in the functional position, the structural irregularity being adapted to the structural irregularity on the portion of the element receiving portion such that engagement between the end cap and the element receiving portion and thus movement of the filter element in the functional position are achieved when the positional relationships of these structural irregularities are mutually oriented, the end cap having a connecting pipe extending into an internal filter cavity surrounded by a fluid-permeable support tube, and a pipe fitting in the element receiving portion in the filter housing engaging with the connecting pipe in the functional position of the filter element, and as a structural irregularity belonging to the end cap, the opening cross-section of the connecting pipe being adapted to the non-circular and asymmetrical outer contour of the pipe fitting in the element receiving portion constituting the structural irregularity of the element receiving portion. In this regard, the through opening on the inner circumference of the receiving part having the filter element and the through opening on the inner circumference of the connecting part for connecting to the housing part are offset from each other about their respective longitudinal axes.

[0003] Therefore, the relevant filter elements can only be moved into their functional positions if the complementary structural features of the element housing and the end cap are adapted to each other such that they allow for interlocking when oriented in their respective orientations. This ensures that the filtration device can only operate with filter elements configured for specific inserts and meeting applicable safety specifications.

[0004] By defining a predetermined rotational position of the filter element within the filter housing, additional advantageous possibilities are opened within the filter housing for placing a shielding member on the end cap, the filter housing having a lateral fluid inlet adjacent to the end cap of the filter element in its functional position, the shielding member extending along the outer side of the filter material of the filter element and covering the area of ​​the fluid inlet as a collision protection element in the functional position of the filter element. The fixed rotational position ensures that the collision protection element is reliably positioned within the inflow area of ​​the filter element. Utility Model Content

[0005] Based on the prior art, the objective of this invention is to, while maintaining the advantages of known solutions, fix the relevant filter element in a fixed, preferably replaceable, manner within the provided filter housing, such positioning of the filter element within the filter housing reduces pressure loss during filtration operation.

[0006] Therefore, according to this utility model, a filter element is proposed, comprising at least an element material extending between two end caps, wherein at least one end cap has a receiving portion for accommodating the element material and a connecting portion for connecting to a housing component. Both the receiving portion and the connecting portion have through openings on their inner circumferential sides for fluid penetration. These through openings are offset relative to the longitudinal axis of the filter element. The filter element has an offset step portion between the receiving portion and the connecting portion, which also includes the through opening. The free cross-sections of the receiving portion, the connecting portion, and the through opening of the offset step portion are identical, each passing perpendicularly through the longitudinal axis of the filter element. Because of these identical free cross-sections, flow loss is avoided when the filtrate flows out of the filter element, and the element material of the filter element is allowed to flow from the outside to the inside of the unfiltered liquid for particle purification.

[0007] Furthermore, the offset stepped portion of the filter element allows the internal space of the filter element having a filtrate volume to be spatially decoupled from its filtrate discharge portion, so that filtrate reception and filtrate discharge are functionally present at different locations of the filter element.

[0008] This is particularly relevant in conjunction with the fact that the filter housing of the filtration device allows the filter element to be mounted eccentrically within the filter housing as a whole, and more precisely, mounted in such a way that unfiltered liquid is introduced through the filter element on the inflow side of the filter housing, forming an enlarged annular gap between the outer periphery of the filter element and the adjacent inner periphery of the filter housing, which narrows on the back side of the element, i.e., on the side away from the inflow side. This results in less flow loss, i.e., less AP, compared to when the element is housed coaxially and centrally relative to its longitudinal axis while maintaining the same wall spacing with the filter housing. There is no corresponding solution in the prior art for this.

[0009] A particularly preferred embodiment specifies that the corresponding through openings of the receiving component and the connecting component are formed by annular hollow cylinders. The hollow cylinder of the receiving component extends co-centered with the longitudinal axis of the filter element. The longitudinal axis of the hollow cylinder of the connecting component extends parallel to the longitudinal axis of the filter element with an offset amount. The offset step portion forms an annular cavity, the longitudinal axis of which intersects the two other longitudinal axes of the receiving component and the connecting component at a predetermined offset angle, preferably between 15° and 45°, and particularly preferably 35°. In this way, the receiving component, the connecting component, and the offset step portion therebetween can be housed in an end cap of the element material in a particularly space-saving manner, through which the filtrate flow is discharged from the filter element.

[0010] In another particularly preferred embodiment of the filter element according to this invention, one end cap has a diverter that extends from the receiving member along at least a portion of the outer periphery of the element material over a predetermined path. Preferably, the diverter is bowl-shaped and covers a portion of the element material of the filter element; the predetermined path is chosen to protect or reduce the load on the element material when fluid flows into it from the inflow side. A defined rotational position of the filter element within the filter housing ensures that the resulting impact protection is always located in the inflow area of ​​the filter element and preferably allows for a uniform distribution of the unfiltered liquid flow towards the element material.

[0011] In a particularly preferred embodiment of the filter element according to this invention, the diverter is provided with channel-shaped fluid inlets for improved flow guidance. Preferably, the channel-shaped fluid inlets are divided into at least two groups, which extend V-shapedly from the central axis of the diverter. The diverter, preferably in a wedge-shaped configuration, enables uniform flow distribution of the incoming fluid in two different directions. By preventing the diverter from forming a closed protective plate as a collision protection element, the element material behind the channel-shaped fluid inlets is always in fluid contact, and thus effective particle filtration can be achieved in the covered area.

[0012] The combination of the filter element with an inflow protection section or diverter results in flow optimization and a more uniform flow distribution, or through-flow, to the entire filter element during filtration operation. Within the scope of simplified replacement operations of used filter elements with new ones, the corresponding connecting parts of such filter elements have an annular groove on their outer periphery for accommodating standardized sealing devices.

[0013] In another particularly preferred embodiment of the filter element solution according to this utility model, one end cap is provided with longitudinal ribs spaced apart from each other in the region of the offset stepped portion, parallel to the longitudinal axis of the element material, the longitudinal ribs being surrounded by polygons that serve as assumed envelopes. The polygons that serve as the envelopes of the longitudinal ribs assist in the accurate positioning of the filter element within the element housing of the filter device.

[0014] The present invention also relates to a filtration device with a filter housing, in which a filter element as described above is housed. The filtration device is characterized in that the filter element is asymmetrically housed in the filter housing by means of an end cap, such that an enlarged annular space is provided between the filter element and the filter housing on the inflow side including the unfiltered liquid flow, and a reduced annular gap is provided on the opposite side. This creates an asymmetrical element housing along with flow guidance within the associated filter housing, which has a substantially cylindrical housing cavity. Preferably, the inflow side in the filter housing is covered by the distributor of the filter element at predetermined intervals to guide the unfiltered liquid flow for uniform flow distribution. Attached Figure Description

[0015] The filter element and associated filter device according to the present invention will now be explained in detail with reference to the accompanying drawings and embodiments. Here, the drawings are in principle and not to scale:

[0016] Figure 1The overall filtration device is shown in a longitudinal sectional view.

[0017] Figure 2 The filtration device is shown along the direction Figure 1 The view is rotated forward 90° from the perspective of the viewer.

[0018] Figure 3 The filter element is shown in part as a half-section view and partly as a view, such as its ability to be displayed according to... Figure 1 and Figure 2 In principle, it is used in filtration equipment; and

[0019] Figure 4 , Figure 5 and Figure 6 Showing according to Figure 1 and Figure 3 The illustration shows the bottom, side, and top views of the connecting parts used to house the filter element, taken from below. Detailed Implementation

[0020] exist Figure 1 The filter housing, denoted as 10, is a hollow cylindrical shape with an upper part 12, a middle part 14, and a bottom part 16 that are threaded together. However, the middle part 14 and the bottom part 16 can also be constructed as a single piece. Figure 1 The filter device shown is in its working position and, in contrast to the bottom 16, the upper end of the upper part 12 can be closed by a threaded housing cover 18. The filter housing 10 contains a filter element, indicated as an integral part 20, which extends parallel to the longitudinal axis 22 of the filter housing 10 in a replaceable manner.

[0021] The filter element 20 typically has an element material 26 extending between an upper end cap 28 and a lower end cap 30. The element material 26 is used to remove particulate contaminants from the fluid flow. To guide the fluid flow, the filter housing 10, or the bottom housing component 16, has an inflow side 32 for introducing an unfiltered liquid flow, which is formed by a circular housing opening 34 in the bottom 16. From this inflow side 32, the unfiltered liquid is distributed along the outer periphery of the filter element 20, and after flowing through the element material 26 from the outside in, the purified fluid flow reaches the inner side 36 of the filter element 20 as filtrate. Then, in the continued guidance of the fluid flow, the filtrate on the inner side 36 of the filter element 20 reaches the outlet side 38 on the bottom side of the filter housing 10. The upper end cap 28 has a bypass valve 40 in a conventional configuration, which allows bypass flow to the filtrate or cleaning side directly, bypassing the element material 26, when the element material 26 is blocked or clogged. The lower end cap 30 has a penetration region 42 specifically configured to guide the filtrate flow. This penetration region 42 is continuously connected to the filtrate or cleaning side, or inner side 36, of the filter element 20. In this respect, the lower end cap 30 can be divided into individual sections with different functional areas. Therefore, the lower end cap 20 typically has a receiving member 44 for receiving the element material 26. For this purpose, the receiving member 44 has an annular adhesive bed 46 extending on the outer peripheral side, through which the lower end of the element material 26, which is free at the end side, is bonded. A fluid-permeable support tube 48, typically provided on the inner peripheral side of the hollow cylindrical element material 26, is also adhesively fixed in this area, along with the element material 26, in the adhesive bed 46 of the receiving member 44. Similarly, the upper side region of the component material 26 and the support tube 48 is fixedly connected to the upper end cap 28 via another adhesive bed 50, just as it is fixed to the lower end cap 30.

[0022] Furthermore, the lower end cover 30 has a connecting part 52 for connecting the filter element 20 to the housing component on the bottom side, or the bottom 16. An offset step 54 exists between the receiving component 44 and the connecting part 52 as an additional offset portion. Not only the receiving component 44, but also the connecting part 52 and the offset step 54, as the so-called offset portion, are integral parts of the lower end cover 30 and are specifically constructed from plastic molding. All the mentioned components 44, 52, and 54 have individual through openings 56, 58, and 60 on their inner circumferential sides, which continuously transition into each other. In particular, the free cross-sections of the various through openings 56, 58, and 60 of the receiving component 44, the connecting part 52, and the offset step 54 are identical, and these cross-sections pass perpendicularly through the longitudinal axis 22 of the filter element 20.

[0023] The corresponding through openings 56, 58 of the receiving component 44, or connecting component 52, are formed by the annular hollow cylinders 62, 66 of the lower end cover 30. The hollow cylinder 62 of the receiving component 44 extends concentrically with respect to the longitudinal axis 22 of the filter element 20. Conversely, the hollow cylinder 66 of the connecting component 52 extends concentrically with respect to the longitudinal axis 23 of the filter housing 10. The offset stepped portion 54 forms an annular cavity 70 with the inclined extending defining wall. The longitudinal axis 72 of this cavity intersects two other longitudinal axes 22 and 23 at a predetermined offset angle α, which passes centrally through the receiving component 44 or connecting component 52. This offset angle is approximately 35° in this case; however, it can vary within the range of 15° to 45°.

[0024] As further illustrated in the accompanying drawings, the lower end cap 30 has a diverter 74 that extends from the receiving member 44 along at least a portion of the outer periphery 76 of the element material 26 over a predetermined path. The element material 26 is preferably placed in a single filter fold, and the hypothetical outer periphery (not shown) of the filter fold thus configured defines an annular gap 78 with the inner circumferential side of the diverter 74.

[0025] Such as especially Figure 4 As shown, the diverter 74 is cup-shaped, and the coverage of the element material 26 is chosen such that the element material 26 is protected when fluid flows into it from the inflow side 32. For this purpose, as in Figure 1 and Figure 2 As shown, the diverter 74 overlaps from the inside to form an annular housing opening 34 with an unfiltered liquid inflow side 32 while maintaining a predetermined spacing.

[0026] Such as especially Figure 4 and Figure 5 As shown, the diverter 74 is provided with a channel-shaped fluid through-port 80 for improved flow guidance. Here, the channel-shaped fluid through-port 80 divides the fluid into at least two groups 82, 84, which extend V-shapedly from the vertical central axis 86 of the diverter 74. The diverter, preferably in a wedge-shaped configuration, enables uniform flow distribution of the inflowing fluid in two distinct directions: one towards one group 82 and the other towards the other group 84. According to... Figure 5The diagram shows a V-shaped central region 88 constructed with a non-channel fluid passageway 80 extending from the central axis 86 located below it, providing a robust protective plate for impact protection within this V-shaped region. The channel-shaped fluid passageways 80 are formed by strip-shaped or band-shaped channels in the protective plate of the diverter 74, and elongated fluid passageways 80 are introduced into the recesses of these channels in the form of through longitudinal grooves. This allows fluid at a predetermined pressure entering the filter housing 10 from the inflow side 32 to pass through each channel-shaped fluid passageway 80 in the form of baffles. The fluid, viewed radially, is incident on the element material 26 via an annular gap 78, ensuring uniform inflow to each filter fold without pressure spikes that could damage the element material 26.

[0027] In addition, according to Figure 1 , Figure 3 , Figure 4 and Figure 5 The diagram shows that the connecting member 52 has an annular groove 90 on its outer peripheral side at its lower end region for receiving a sealing device 92 in the form of an O-ring. In an embodiment not shown in detail, it is also possible to construct a sprayed sealing edge by the associated sealing device 92, making a seal without an elastomer possible. However, according to... Figure 1 As illustrated, via the corresponding sealing device 92, the filter element 20 is guided in a replaceable manner in the bottom region below, that is, in the bottom 16 of the filter housing 10, sealed with its lower end cap 30. To replace the contaminated filter element 20 with a new one, simply unscrew the upper part 12, which is in the form of a housing cover 18, from the middle 14 of the filter housing 10, and in this way, the filter element 20 can be pulled out by hand from above as a whole, thus allowing the filter element to be removed according to the diagram. Figure 3 The illustration shows the filter element located outside the filter housing 10. In the relevant filter element 20, the bypass valve 40 is omitted, and for this purpose, the upper end cap 28 is constructed in a closed manner. Then, new elements are inserted in reverse order, and the device can be put back into operation.

[0028] For example, especially from Figures 4 to 6 As it turns out, the lower end cap 30 of the plastic molded part, below the receiving component 44, has a single downwardly projecting longitudinal rib 94 of different structural lengths, which is surrounded by a polygon as a hypothetical envelope 96, as shown by its dashed lines. Figure 6 Depicted in the middle. Here, the envelope 96 at least partially follows the circumferential edge 98 of the lower end cap 30 and reinforces the longitudinal ribs 94, particularly the transition region between the receiving member 44 and the connecting member 52, which is in the form of an offset step 54, in which the longitudinal ribs 94 themselves have offset steps 54. Each longitudinal rib 94 here is according to... Figure 6 The diagrams are combined into four different groups: "upper, lower, right, and left". The right and left groups have longitudinal ribs 94 with the same construction. Alternatively, in a group, longitudinal ribs 94 that extend parallel to each other and are arranged perpendicularly and spaced apart from each other are perpendicular to the adjacent group in a hypothetical extension. This group also has its hypothetical extension.

[0029] In addition to reinforcing the lower end cap 30, the longitudinal rib structure also enables the filter element 20 to be accurately positioned within the filter housing 10 by means that the diverter 74 is positioned adjacent to the inflow side 32 with the housing opening 34.

[0030] Through the asymmetrical design of the lower end cover 30, it is possible to... Figure 1 The longitudinal section shows the filter element 20 offset within the filter housing 10, meaning the longitudinal axis 22 of the filter element 20 is offset by an amount 'a' relative to the longitudinal axis 23 of the filter housing 10. This results in an enlarged, gap-shaped annular space 100 on the inflow side 32 with the unfiltered liquid flow, and a reduced, gap-shaped annular space 102 between the filter element 20 and the filter housing 10 on the opposite side, such that the filter element 20 is generally housed in the filter housing 10 in an asymmetrical configuration. Therefore, an enlarged spacing is also forced between the diverter 74 and the inflow side 32 of the filter housing 10.

[0031] Using the solution according to this invention, a standard filter element with an asymmetrical lower end cap 30 and an inflow protection device in the form of a diverter 74 can be inserted into a standard filter housing 10. As implemented, the guide ribs in the form of longitudinal ribs 94 are polygonal on the lower end cap 30, which is in the form of a so-called O-ring cap, so that the filter element 20 as a whole can always be accurately positioned in the filter housing 10 and ensure that the diverter 74 is always accurately positioned on the filter inlet of the housing opening 34, which is in the form of an annular housing opening forming the inflow side 32 of the device. The rearward offset positioning of the filter element 20 outside the housing center, i.e., outside the longitudinal axis 23 of the filter housing 10, results in an enlarged gap-shaped annular space 100 between the unfiltered liquid inlet 34 and the filter element 20, thereby reducing Δp by a smaller flow loss.

[0032] The combination of element 20 and the inflow protection device, i.e., the diverter 74, results in flow optimization and a more uniform flow distribution, or through-flow, along its longitudinal axis 22 of the entire filter element 20. Furthermore, element 20 is protected in the fluid inlet area. Additionally, it is possible to increase the hydraulic load on the element by using a specific pad construction combined with the new asymmetrical cover 30, and thereby construct it smaller compared to the symmetrical standard embodiment without changing filter performance. To enable the filter element 20 to operate according to... Figure 1 The filter element 20 is reliably housed in the filter housing 10 in its asymmetrical position in the region of its upper end cap 28. The end cap 28 may have a segmental widening portion 104, which may be constructed as a sheet metal part and supported on the inner peripheral side of the middle portion 14 of the filter housing 10 with an upwardly extending edge, so that the filter element 20 is reliably housed in the filter housing 10 via its two end caps 28, 30.

Claims

1. A filter element comprising at least an element material (26) extending between two end caps (28, 30), wherein at least one end cap (30) has a receiving member (44) for receiving the element material (26) and a connecting member (52) for connection to a housing member (16), the receiving member (44) and the connecting member (52) both having through openings on their inner circumferential sides for fluid penetration, the through openings being offset relative to the longitudinal axis (22) of the filter element (20), characterized in that, An offset step portion (54) is provided between the receiving component (44) and the connecting component (52). The offset step portion also has a through opening, and the free cross-sections of the through openings of the receiving component (44), the connecting component (52) and the offset step portion (54) are the same. The free cross-sections pass perpendicularly through the longitudinal axis (22) of the filter element (20).

2. The filter element according to claim 1, characterized in that, The corresponding through openings of the receiving component (44) and the connecting component (52) are formed by annular hollow cylinders (62, 66). The hollow cylinder (62) of the receiving component (44) extends co-centered with the longitudinal axis (22) of the filter element (20). The hollow cylinder (66) of the connecting component (52) extends co-centered with the longitudinal axis (23) of the filter housing (10) and parallel to the longitudinal axis (22) of the filter element (20) with an offset (a). The offset step portion (54) forms an annular cavity (70). The longitudinal axis (72) of the cavity intersects with two other longitudinal axes (22, 23) with a predetermined offset angle α.

3. The filter element according to claim 2, characterized in that, The offset angle α is between 15° and 45°.

4. The filter element according to claim 2, characterized in that, The offset angle α is 35°.

5. The filter element according to any one of claims 1 to 4, characterized in that, One of the end caps (30) has a diverter (74) that extends from the receiving part (44) along at least a portion of the outer periphery (76) of the element material (26) in a predetermined path.

6. The filter element according to claim 5, characterized in that, The diverter (74) is designed in a bowl shape to cover a portion of the component material (26), and the predetermined path is selected such that the component material (26) is protected when fluid flows into the component material (26) from the inflow side (32).

7. The filter element according to claim 5, characterized in that, The diverter (74) is provided with a channel-shaped fluid passage (80) for improved flow guidance.

8. The filter element according to claim 7, characterized in that, The channel-shaped fluid is divided into at least two groups (82, 84) through the port (80), the groups extending out in a V-shape from the central axis (86) of the splitter (74), the splitter enabling the inflowing fluid to be uniformly distributed along two different directions.

9. The filter element according to claim 8, characterized in that, The diverter (74) can achieve a uniform flow distribution of the incoming fluid in two different directions by means of a wedge-shaped structure.

10. The filter element according to any one of claims 1 to 4, characterized in that, The connecting component (52) has an annular groove (90) on its outer peripheral side for accommodating the sealing device (92).

11. The filter element according to any one of claims 1 to 4, characterized in that, One of the end caps (30) has a single longitudinal rib (94) spaced apart from each other in the region of the offset step portion (54) parallel to the longitudinal axis (22) of the filter element (20), the longitudinal rib being surrounded by a polygon as a hypothetical envelope (96).

12. A filtration device, the filtration device comprising a filter housing, wherein a filter element according to any one of claims 1 to 11 is housed in the filter housing, characterized in that, The filter element (20) is asymmetrically housed in the filter housing (10) by means of an end cap (30), such that an enlarged annular space (100) is provided between the filter element (20) and the filter housing (10) on the inflow side (32) including the unfiltered liquid flow and a reduced annular space (102) is provided between the filter element and the filter housing on the opposite side.

13. The filtration device according to claim 12, characterized in that, The inflow side (32) is covered in the filter housing (10) by the diverter (74) of the filter element (20) at a predetermined interval for introducing the unfiltered liquid flow.

Images