A filter cartridge

Abstract

The application relates to a filter element, belonging to the technical field of filter elements, which comprises a cover plate one, a cover plate two, a filter paper cylinder and a center tube, a plurality of oil inlet holes are arranged on the outer wall of the center tube, the cover plate one and the cover plate two are coaxially arranged at the two ends of the filter paper cylinder, the center tube is installed on the side of the cover plate one close to the filter paper cylinder, a cleaning ring is arranged on the side of the cover plate one close to the filter paper cylinder, the cleaning ring comprises a ring body and a cleaning part which are fixedly connected, the ring body is connected with the cover plate one in a detachable mode, the ring body is sleeved on the outer wall of the filter paper cylinder and can slide along the length direction of the filter paper cylinder, the cleaning part is installed on the inner wall of the ring body and can be attached to the outer wall of the filter paper cylinder, and the cleaning part is used for cleaning the outer wall of the filter paper cylinder. The application has the effect of prolonging the service life of the filter paper cylinder.

Description

Technical Field

[0001] This application relates to the field of filter elements, and more particularly to a filter cartridge. Background Technology

[0002] Filter elements in filters are typically used to separate solid particles from liquids or gases to ensure the normal operation of equipment. Filter elements enable liquids (such as oil) to be restored to the cleanliness required for production or daily life after being contaminated. Filter elements are generally installed in a filter housing located in the fluid passage and can isolate the external environment. When the filter element is in operation, the fluid in the flow passage first enters the filter housing, then seeps in from the outside of the filter element, and then exits from the filter element, thereby achieving the filtration of the fluid.

[0003] In existing technologies, the filter paper cartridge is usually the one that plays a filtering role in filter cartridges. In order to obtain a larger filtration area, the filter paper cartridge is usually folded into a cylindrical shape. However, this causes more impurities to accumulate at the folded parts of the filter paper cartridge and is difficult to clean. After long-term use, the impurities accumulated on the outer wall of the filter paper cartridge will block the pores on the filter paper cartridge, eventually leading to a reduction in the filtration performance of the filter paper cartridge. Subsequently, the filter paper cartridge needs to be replaced, which makes the service life of the filter paper cartridge short. Summary of the Invention

[0004] In order to extend the service life of filter paper cartridges, this application provides a filter element.

[0005] This application provides a filter element that adopts the following technical solution:

[0006] The device includes a cover plate 1, a cover plate 2, a filter paper cylinder, and a central tube. The outer wall of the central tube has multiple oil inlet holes. The cover plate 1 and the cover plate 2 are coaxially arranged at both ends of the filter paper cylinder. The central tube is installed on the side of the cover plate 1 near the filter paper cylinder. A cleaning ring is provided on the side of the cover plate 1 near the filter paper cylinder. The cleaning ring includes a ring body and a cleaning part that are fixedly connected. The ring body is detachably connected to the cover plate 1. The ring body is sleeved on the outside of the filter paper cylinder and can slide along the length of the filter paper cylinder. The cleaning part is installed on the inner wall of the ring body and can fit against the outer wall of the filter paper cylinder. The cleaning part is used to clean the outer wall of the filter paper cylinder.

[0007] By adopting the above technical solution, when the oil enters between the filter housing and the outer wall of the filter paper cylinder, the oil seeps into the filter paper cylinder after being filtered by the filter paper cylinder. The filtered oil is discharged, while the impurities in the oil accumulate on the outer wall of the filter paper cylinder. When there are a lot of impurities accumulated on the outer wall of the filter paper cylinder, the filter element can be removed from the filter housing, and then the cleaning ring can be removed from the cover plate. The cleaning ring can be driven to slide along the length of the filter paper cylinder, so that the cleaning part installed on the ring can clean the outer wall of the filter paper cylinder. Since the cleaning part can fit against the outer wall of the filter paper cylinder, when the cleaning part slides along the axis of the filter paper cylinder with the ring, the cleaning part can still clean the impurities at the folds of the filter paper cylinder, thereby ensuring the filtration performance of the filter paper cylinder after long-term use, increasing the time interval for replacing the filter paper cylinder, and achieving the effect of increasing the service life of the filter paper cylinder.

[0008] Optionally, the ring body is provided with a plug groove, and the cover plate is provided with a plug part at the position corresponding to the plug groove. The plug part is inserted into the plug groove, and a connector is provided on the ring body. After the connector passes through the ring body, it can be connected to the plug part by means of thread engagement.

[0009] By adopting the above technical solution, a slot is provided on the ring body, and a connector is provided on the cover plate to engage with the slot. This allows the cleaning ring to find its position after cleaning by engaging with the slot, improving the connection speed between the cleaning ring and the cover plate. At the same time, the connector can be connected to the connector by thread after passing through the ring body. This prevents the cleaning ring from easily falling off the cover plate when not in use, thus avoiding obstruction of the filter paper cartridge's filtration surface.

[0010] Optionally, a sealing groove is provided on the ring body, and a sealing element is provided in the sealing groove, which can abut against the cover plate.

[0011] By adopting the above technical solution, a sealing groove is provided on the ring body, and a sealing element is provided in the sealing groove that can abut against the cover plate. This makes the gap between the ring body and the cover plate filled by the sealing element, so that there is less oil residue between the ring body and the cover plate when it is necessary to separate the ring body and the cover plate, thus making it easier to remove the cleaning ring from the cover plate.

[0012] Optionally, a booster assembly is provided on the cover plate 2. The booster assembly is used to accelerate the oil output speed inside the filter paper cylinder when the external pressure of the filter paper cylinder is large.

[0013] By adopting the above technical solution, the oil filtered in the central tube can be discharged quickly by setting a booster component on the cover plate 2, thereby reducing the probability of the filter paper cylinder being damaged by increased pressure due to the accumulation of oil in the central tube preventing the oil outside the filter paper cylinder from penetrating.

[0014] Optionally, the booster assembly includes a pusher block, an oil pusher, and a spring. The portion of the cover plate two located inside the filter paper cylinder has a C-shaped groove. An installation groove is provided on the side wall at the bottom of the groove. The cover plate two also has an oil inlet channel communicating with the installation groove. The end of the oil inlet channel away from the installation groove is located on the side of the cover plate two away from the filter paper cylinder. One end of the spring is connected to the side wall of the installation groove near the oil inlet channel, and the other end of the spring is connected to the pusher block. One end of the oil pusher is located inside the filter paper cylinder, and the other end of the oil pusher is located in the groove and abuts against the pusher block. The pusher block is located in the installation groove and is used to push the oil pusher to slide along the axis of the filter paper cylinder within the groove.

[0015] By adopting the above technical solution, the groove has a C-shaped cross-section, which prevents the end of the oil pusher located in the groove from easily coming out of the groove. When the oil pressure outside the filter paper cylinder increases to a certain level, the oil will push the pusher block to move in the mounting groove through the oil inlet channel, thereby realizing the movement of the oil pusher block along the axis of the filter paper cylinder in the groove. After the oil pusher block moves, it reduces the space inside the filter paper cylinder, thereby pushing out the filtered oil. When the filtered oil inside the filter paper cylinder is discharged, the pressure outside the filter paper cylinder decreases, the spring returns to its original length, thereby driving the pusher block to retract, and then the oil pusher block returns to its original position. The oil pusher block prevents the pressure of the oil outside the filter paper cylinder from becoming too high, thus protecting the filter paper cylinder from damage caused by excessive oil pressure.

[0016] Optionally, the oil-pushing component includes an oil-pushing plate, a connecting rod, and an abutment plate. The oil-pushing plate and the abutment plate are respectively installed at both ends of the connecting rod. The oil-pushing plate is located inside the filter paper cylinder, and the abutment plate is located inside the groove and abuts against the push block. The abutment plate is provided with a wedge-shaped surface one, and the push block is provided with a wedge-shaped surface two that can abut against the wedge-shaped surface one.

[0017] By adopting the above technical solution, the abutment plate is located in the groove, and the abutment plate is provided with a wedge-shaped surface one, while the push block is provided with a wedge-shaped surface two that can fit with the wedge-shaped surface one. This allows the push block to be pushed under the oil pressure in the oil inlet channel, thereby causing the abutment plate to rise in the groove, and then causing the push plate to rise together in the filter paper cylinder, thus achieving the effect of pushing the oil in the filter paper cylinder.

[0018] Optionally, a second seal is provided on the inner wall of the groove, which can abut against the outer wall of the connecting rod. The second seal is used to prevent oil from the filter paper cylinder from entering the groove.

[0019] By adopting the above technical solution, a sealing element 2 that can abut against the outer wall of the connecting rod is provided on the inner wall of the groove to prevent the oil in the filter paper tube from flowing into the groove. This prevents the oil in the filter paper tube from filling the space in the groove, reducing the probability that the push block cannot be pushed due to the pressure of the oil in the filter paper tube on the abutment plate.

[0020] Optionally, a guide plate is provided on the side of the cover plate away from the central tube, and a guide part is provided on the guide plate to guide the position of the cover plate in the filter housing.

[0021] By adopting the above technical solution, when it is necessary to install the filter element and the filter housing, the guide plate on the cover plate is first inserted into the slot on the filter housing. Under the action of the guide plate, the position of the cover plate on the filter housing will be adjusted automatically, so as to continue the subsequent assembly. Throughout the process, due to the guiding effect of the guide plate, the operator can quickly adjust the position of the cover plate even without a visual view, thereby realizing the connection between the filter element and the filter housing, which improves the connection efficiency between the filter element and the filter housing.

[0022] In summary, this application includes at least the following beneficial technical effects:

[0023] 1. By setting a cleaning ring on the cover plate, when it is necessary to clean the outer wall of the filter paper cartridge, the cleaning ring can be driven to slide along the length of the filter paper cartridge. The cleaning ring can then clean the impurities attached to the outer wall of the filter paper cartridge, so that the filter paper cartridge can maintain a good filtration effect and increase the service life of the filter paper cartridge.

[0024] 2. By setting a guide plate on the cover plate, the cover plate can be automatically aligned with the filter housing when it is connected to the filter housing. This shortens the time required for workers to accurately locate the filter element installation position when assembling the filter element and the filter housing, thus improving the efficiency of filter element installation. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a filter element according to Embodiment 1 of this application;

[0026] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the hidden cover plate;

[0027] Figure 3 yes Figure 1 A cross-sectional schematic diagram;

[0028] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a cross-sectional schematic diagram of a filter element in Embodiment 2 of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Cover plate one; 2. Cover plate two; 3. Filter paper cylinder; 4. Central tube; 5. Oil inlet hole; 6. Cleaning ring; 7. Ring body; 8. Cleaning part; 9. Insertion groove; 10. Insertion part; 11. Connector; 12. Sealing groove; 13. Sealing part one; 14. Pushing assembly; 15. Push block; 16. Oil pushing part; 17. Spring; 18. Groove; 19. Mounting groove; 20. Oil inlet channel; 21. Oil pushing plate; 22. Connecting rod; 23. Abutment plate; 24. Wedge surface one; 25. Wedge surface two; 26. Sealing part two; 27. Guide plate; 28. Guide part. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0032] Example 1

[0033] Embodiment 1 of this application discloses a filter element, referring to... Figure 1 , Figure 2 and Figure 3 The filter element includes a cover plate 1, a cover plate 2, a filter paper cylinder 3, and a central tube 4. The cover plate 1 and the cover plate 2 are coaxially arranged at both ends of the filter paper cylinder 3 along its length, while the central tube 4 is installed on the side of the cover plate 1 close to the filter paper cylinder 3. The central tube 4 is located inside the filter paper cylinder 3, and an oil inlet hole 5 is provided on the outer wall of the central tube 4. This allows the oil located between the filter housing and the filter paper cylinder 3 to enter the central tube 4 through the oil inlet hole 5 after being filtered by the filter paper cylinder 3, and finally be discharged from the central tube 4.

[0034] Below the cover plate 1, a cleaning ring 6 is provided. The cleaning ring 6 includes a fixedly connected ring body 7 and a cleaning part 8. The cleaning part 8 can be made of a material such as rubber or nylon that will not damage the filter paper cylinder 3. The outline of the cleaning part 8 is adapted to the outline of the outer wall of the filter paper cylinder 3. The ring body 7 is fitted on the filter paper cylinder 3 and is detachably connected to the cover plate 1. The cleaning part 8 is fixedly set on the inner side of the ring body 7 and abuts against the outer wall of the filter paper cylinder 3. When it is necessary to clean the impurities attached to the outer wall of the filter paper cylinder 3, the ring body 7 can be removed from the cover plate 1 and driven to slide along the length of the filter paper cylinder 3. During the sliding of the ring body 7, the cleaning part 8 will clean the impurities accumulated on the outer wall of the filter paper cylinder 3. After cleaning, the ring body 7 can be reconnected to the cover plate 1.

[0035] A protruding guide plate 27 is provided above the cover plate 1. The guide plate 27 is an arc-shaped plate with an inclined guide part 28. The guide plate 27 can be inserted into the slot on the filter housing. During the insertion process, the guide part 28 abuts against the inner wall of the slot, thereby guiding the position of the cover plate 1 inside the filter housing. This allows the operator to quickly connect the filter element and the filter housing without spending too much time finding the connection position between the filter element and the filter housing.

[0036] Reference Figure 3 and Figure 4 The ring body 7 is provided with a insertion groove 9, and the lower surface of the cover plate 1 is provided with an insertion part 10 at the position corresponding to the insertion groove 9. This allows the insertion part 10 on the cover plate 1 to insert into the insertion groove 9 on the ring body 7 when the ring body 7 moves closer to the cover plate 1. A countersunk hole is provided on the outer wall of the ring body 7, and a connector 11 is inserted into the countersunk hole. The connector 11 is a bolt. After the connector 11 is inserted into the countersunk hole in a direction perpendicular to the axis of the filter paper cylinder 3, it is connected to the insertion part 10 located in the insertion groove 9 by a threaded engagement. This prevents the ring body 7 from easily separating from the cover plate 1 when not in use, thus preventing it from sliding on the filter paper cylinder 3 and reducing the original filtration area of ​​the filter paper cylinder 3. At the same time, due to the insertion engagement between the insertion part 10 and the insertion groove 9, the ring body 7 also prevents the cleaning part 8 from easily rotating around the axis of the filter paper cylinder 3 on the filter paper cylinder 3. This prevents the cleaning part 8 from easily damaging the outer wall of the filter paper cylinder 3.

[0037] Furthermore, a sealing groove 12 is provided on the upper surface of the ring body 7. The sealing groove 12 is annular, and a sealing element 13 is installed inside the sealing groove 12. The sealing element 13 is a sealing ring. When the ring body 7 is connected to the cover plate 1, the sealing element 13 and the side of the cover plate 1 closest to the filter paper cylinder 3 are pressed together. This prevents the oil outside the filter paper cylinder 3 from easily entering the gap between the ring body 7 and the cover plate 1. This prevents the oil stains formed by the oil from filling the gap between the ring body 7 and the cover plate 1. This makes it easier to remove the ring body 7 from the cover plate 1 later, so that the cleaning part 8 on the ring body 7 can clean the outer wall of the filter paper cylinder 3.

[0038] A booster assembly 14 is provided on the cover plate 2. The booster assembly 14 can increase the discharge speed of the filtered oil inside the filter paper cylinder 3 when the external oil pressure is high. The booster assembly 14 includes a pusher block 15, an oil pusher 16, and a spring 17. A groove 18 is provided in the part of the cover plate 2 located inside the filter paper cylinder 3. The groove 18 has a C-shaped cross-section. On the side of the bottom of the groove 18, there are also two mounting grooves 19, which are symmetrically distributed about the axis of the filter paper cylinder 3. The number of pushers 15 and springs 17 corresponds to the number of mounting grooves 19. It also includes an oil inlet channel 20 that communicates with the mounting groove 19. The end of the oil inlet channel 20 away from the mounting groove 19 is connected to the part of the cover plate 2 located outside the filter paper cylinder 3. The spring 17 is located inside the mounting groove 19. One end of the spring 17 is connected to the position of the mounting groove 19 near the oil inlet channel 20, and the other end of the spring 17 is connected to the push block 15. The push block 15 is located inside the mounting groove 19 and can slide inside the mounting groove 19. The oil pushing component 16 includes an oil pushing plate 21, a connecting rod 22, and an abutment plate 23. The oil pushing plate 21 and the abutment plate 23 are located at the two ends of the connecting rod 22, respectively. The oil pushing plate 21 is located at the filter paper cylinder 3. The outer wall of the oil-pushing plate 21 inside the filter paper cylinder 3 abuts against the inner wall of the filter paper cylinder 3. The abutting plate 23 is located in the groove 18 and abuts against the push block 15. The abutting plate 23 is located above the push block 15. A wedge-shaped surface 24 is provided on the lower surface of the abutting plate 23, while a wedge-shaped surface 25 is provided on the push block 15. The wedge-shaped surface 24 abuts against the wedge-shaped surface 25. This causes the oil accumulated outside the filter paper cylinder 3 to rush into the oil inlet channel 20 when the external pressure of the filter paper cylinder 3 is large, thereby increasing the pressure in the oil inlet channel 20 and pushing the push block 15 out. When the push block 15 is pushed, due to the wedge-shaped surface 24 on the push block 15, the oil will flow into the oil inlet channel 20. This will increase the pressure in the oil inlet channel 20 and push the push block 15 out. 5 is in close contact with the wedge-shaped surface on the abutment plate 23. Therefore, the abutment plate 23 will rise in the groove 18, thereby driving the oil pusher plate 21 to rise. After the oil pusher rises, the space inside the filter paper cylinder 3 is reduced, thereby accelerating the discharge of the oil inside the filter paper cylinder 3. When the oil inside the filter paper cylinder 3 is discharged, the oil outside the filter paper cylinder 3 will accelerate to penetrate into the filter paper cylinder 3. At this time, the oil pressure outside the filter paper cylinder 3 decreases, the pusher block 15 is reset under the action of the spring 17, and the abutment plate 23 is lowered to the initial position. This prevents the outer wall of the filter paper cylinder 3 from being damaged due to excessive oil pressure, thereby increasing the service life of the filter paper cylinder 3.

[0039] Furthermore, a second seal 26 is also fitted on the connecting rod 22. The second seal 26 is also a sealing ring. The second seal 26 is used to block the distance between the connecting rod 22 and the upper side wall of the groove 18. This prevents the filtered oil in the filter paper cylinder 3 from easily seeping into the groove 18 through the gap between the connecting rod 22 and the upper side wall of the groove 18. This prevents the space in the groove 18 from being filled by the oil in the filter paper cylinder 3, reducing the probability that the push block 15 cannot be pushed due to the pressure of the oil in the filter paper cylinder 3 on the abutment plate 23.

[0040] The implementation principle of this application embodiment is as follows: First, the guide plate 27 on the cover plate 1 guides the cover plate 1 to the installation position in the filter housing, and then the filter element and the filter housing are installed. During use, the oil enters the gap between the filter housing and the outer wall of the filter paper cylinder 3. The oil enters the filter paper cylinder 3 through the filter and is then discharged. During the whole process, if the oil pressure in the filter and the filter paper cylinder 3 is too high (i.e. the external pressure of the filter paper cylinder 3 is greater than the internal pressure of the filter paper cylinder 3), the oil pushes the pusher block 15 to move through the oil inlet channel 20, thereby causing the pusher 16 to rise in the groove 18, so that the pusher 16 compresses the space in the filter paper cylinder 3, and the oil in the filter paper cylinder 3 can be discharged.

[0041] When the filter paper cartridge 3 needs to be cleaned after use, the connector 11 on the ring body 7 can be removed. By driving the ring body 7 to move along the axis of the filter paper cartridge 3, the cleaning part 8 on the ring body 7 can clean the impurities attached to the outside of the filter paper cartridge 3, so as to ensure that the filter paper cartridge 33 can maintain a good filtration effect for a long time.

[0042] Example 2

[0043] Reference Figure 5 The difference between Embodiment 2 and Embodiment 1 lies in the structure and installation method of the booster assembly 14. In Embodiment 2, the cover plate 2 has a perforation, and the booster assembly 14 only includes the oil pusher 16. The oil pusher 16 includes a connecting rod 22, an abutment plate 23, and an oil pusher plate 21. The connecting rod 22 is inserted into the perforation, and the sealing member 26 is also sleeved on the connecting rod 22 to fill the gap between the outer wall of the connecting rod 22 and the inner wall of the perforation. The oil pusher plate 21 and the abutment plate 23 are respectively installed at both ends of the connecting rod 22. The oil pusher plate 21 is located on the side of the cover plate 2 close to the filter paper cylinder 3 and inside the filter paper cylinder 3, while the abutment plate 23 is located on the side of the cover plate 2 away from the filter paper cylinder 3. When the oil pressure outside the filter paper cylinder 3 is too high, it will push the abutment plate 23, thereby driving the connecting rod 22 to move along its own axis, and thus causing the oil pusher plate 21 to push the oil inside the filter paper cylinder 3.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A filter element comprising a cover plate (1), a cover plate (2), a filter paper cylinder (3), and a central tube (4), wherein the outer wall of the central tube (4) is provided with a plurality of oil inlet holes (5), the cover plate (1) and the cover plate (2) are coaxially disposed at both ends of the filter paper cylinder (3), and the central tube (4) is installed on the side of the cover plate (1) near the filter paper cylinder (3), characterized in that: A cleaning ring (6) is provided on the side of the cover plate (1) near the filter paper cylinder (3). The cleaning ring (6) includes a ring body (7) and a cleaning part (8) that are fixedly connected. The ring body (7) is detachably connected to the cover plate (1). The ring body (7) is sleeved on the filter paper cylinder (3) and can slide along the length direction of the filter paper cylinder (3). The cleaning part (8) is installed on the inner wall of the ring body (7) and can fit against the outer wall of the filter paper cylinder (3). The cleaning part (8) is used to clean the outer wall of the filter paper cylinder (3). The cover plate 2 (2) is provided with a booster assembly (14), which is used to accelerate the oil output speed inside the filter paper cylinder (3) when the external pressure of the filter paper cylinder (3) is large. The booster assembly (14) includes a pusher block (15), an oil pusher (16), and a spring (17). The portion of the cover plate two (2) located inside the filter paper cylinder (3) is provided with a C-shaped groove (18). An installation groove (19) is provided on the side wall of the bottom of the groove (18). The cover plate two (2) is also provided with an oil inlet channel (20) communicating with the installation groove (19). The end of the oil inlet channel (20) away from the installation groove (19) is located on the side of the cover plate two (2) away from the filter paper cylinder (3). The spring... (17) One end is connected to the side wall of the mounting groove (19) near the oil inlet channel (20), and the other end of the spring (17) is connected to the push block (15). One end of the pusher (16) is located inside the filter paper cylinder (3), and the other end of the pusher (16) is located inside the groove (18) and abuts against the push block (15). The push block (15) is located inside the mounting groove (19), and the push block (15) is used to push the pusher (16) to slide along the axis of the filter paper cylinder (3) inside the groove (18).

2. The filter element according to claim 1, characterized in that: The ring body (7) is provided with a insertion groove (9), and the cover plate (1) is provided with an insertion part (10) at the position corresponding to the insertion groove (9). The insertion part (10) is inserted into the insertion groove (9). A connector (11) is provided on the ring body (7). After the connector (11) passes through the ring body (7), it can be connected to the insertion part (10) by means of thread engagement.

3. A filter element according to claim 1, characterized in that: A sealing groove (12) is provided on the ring body (7), and a sealing element (13) is provided in the sealing groove (12), which can abut against the cover plate (1).

4. A filter element according to claim 1, characterized in that: The oil-pushing component (16) includes an oil-pushing plate (21), a connecting rod (22), and an abutment plate (23). The oil-pushing plate (21) and the abutment plate (23) are respectively installed at both ends of the connecting rod (22). The oil-pushing plate (21) is located inside the filter paper cylinder (3). The abutment plate (23) is located inside the groove (18) and abuts against the push block (15). The abutment plate (23) is provided with a wedge-shaped surface one (24), and the push block (15) is provided with a wedge-shaped surface two (25) that can abut against the wedge-shaped surface one (24).

5. A filter element according to claim 4, characterized in that: The inner wall of the groove (18) is provided with a second sealing element (26) that can abut against the outer wall of the connecting rod (22). The second sealing element (26) is used to prevent the oil in the filter paper cylinder (3) from entering the groove (18).

6. A filter element according to claim 1, characterized in that: A guide plate (27) is provided on the side of the cover plate (1) away from the central tube (4). The guide plate (27) is arc-shaped and a guide part (28) is provided on the guide plate (27). The guide part (28) is used to guide the position of the cover plate (1) in the filter housing.

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