Hydraulic pump filter with sealing structure

Abstract

The hydraulic pump filter comprises a first matching ring and a second matching ring which are fixed on the inner wall of an oil inlet pipe, the first matching ring is located at the joint of the upper end of the oil inlet pipe and a flange structure, and the second matching ring is located at the lower end of the oil inlet pipe and the lower end of an oil inlet hole; a net type filter element is installed in the oil inlet pipe, the outer side of the upper end of the net type filter element is sleeved with a second sealing piece matched with the first matching ring in a sealed mode, the outer side of the lower end of the net type filter element is sleeved with a first sealing piece matched with the second matching ring in a sealed mode, and the net type filter element is installed in the oil inlet pipe in a clamped mode through the first sealing piece and the second sealing piece. By adopting the structures such as the first matching ring, the second matching ring, the first sealing piece and the second sealing piece, the sealing performance between the net type filter element and the inner side of the oil inlet pipe is good in the long-term use process, the good filtering effect can be always achieved, and the filtering effect of the hydraulic pump filter is guaranteed.

Description

Technical Field

[0001] The invention relates to a filter, in particular to a hydraulic pump filter with a sealing structure used in the field of hydraulic pumps. Background Art

[0002] The hydraulic pump is the power element of the hydraulic system. It is driven by an engine or an electric motor. It sucks oil from the hydraulic tank, forms pressurized oil and discharges it to the actuator. The function of the filter in the hydraulic system is to keep the fluid clean. From a filtration perspective, the inlet of the pump is an ideal location for the filter medium. In theory, there is no high-speed fluid to interfere with the trapped particles, and there is no high pressure drop on the filter element to promote particle separation, thereby improving filtration efficiency.

[0003] In actual use, sealing is achieved only by a single sealing ring, and the overall effect is poor. Once the hydraulic oil leaks at this position, it will affect the entire construction environment, and the overall maintenance is also more difficult. The prior art is briefly introduced and the problems are pointed out.

[0004] In order to solve the problem of poor sealing effect of traditional hydraulic pump filters, a hydraulic pump filter with a sealing structure in the market adopts an oil outlet sealing design, which has a certain market share.

[0005] The specification of Chinese patent CN219639185U discloses a hydraulic pump filter with a sealing structure, including an outer cylinder, a terminal head is installed on the top of the outer cylinder, and the side of the terminal head is connected to an oil outlet pipe. The end face of the oil outlet pipe is provided with a sealing mechanism, and the sealing mechanism includes: a first sealing component, one end of which is adjustably embedded in the end face of the oil outlet pipe, and the other end protrudes to the outside of the oil outlet pipe; a second sealing component, which is arranged concentrically with the first sealing component, and the second sealing component is built into the end face of the oil outlet pipe. The second sealing component includes an air supply part, which is installed on the terminal head. The hydraulic pump filter with a sealing structure can form a multi-layer sealing structure at the oil outlet position of the filter, thereby greatly improving the sealing performance, avoiding leakage during use, and ensuring the normal processing.

[0006] Existing hydraulic pump filters are usually equipped with filter elements (such as mesh filter elements), but the existing hydraulic pump filters do not pay enough attention to the sealing between the filter element and the oil inlet pipe (i.e., the outer cylinder mentioned above). During use, the connection between the filter element and the oil inlet pipe is likely to be damaged (cracked or disconnected, etc.) due to the increase in oil pressure, so that the oil entering the filter does not flow out through the filter element, the filtering function is lost, and the filtering effect cannot be guaranteed. Summary of the invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to provide a hydraulic pump filter with a sealing structure that can enhance the sealing between the internal filter element and the oil inlet pipe so that the filter element can stably play a filtering role.

[0008] In order to solve the above problems, the present invention provides a hydraulic pump filter with a sealing structure, comprising an oil inlet pipe, a plurality of oil inlet holes for oil supply are evenly opened on the circumference of the lower part of the oil inlet pipe, an end head is fixedly connected to the upper end of the oil inlet pipe through a flange structure, an oil outlet is integrally formed on one side of the end head, and a sealing gasket is arranged in the flange structure; A first matching ring and a second matching ring are fixed to the inner wall of the oil inlet pipe, the first matching ring is located at the intersection between the upper end of the oil inlet pipe and the flange structure, and the second matching ring is located at the lower end of the oil inlet pipe and at the lower end of the oil inlet hole; A mesh filter element is installed in the oil inlet pipe. A second sealing member that cooperates with a first matching ring for sealing is sleeved on the outer side of the upper end of the mesh filter element. A first sealing member that cooperates with a second matching ring for sealing is sleeved on the outer side of the lower end of the mesh filter element. The mesh filter element is installed in the oil inlet pipe by clamping the first sealing member and the second sealing member.

[0009] In the hydraulic pump filter with a sealing structure, the first sealing member and the second sealing member are used to realize the sealing connection between the upper and lower ends of the mesh filter element. Firstly, it is convenient to install the mesh filter element in the oil inlet pipe. Secondly, it is possible to realize the sealing between the outside of the mesh filter element and the inside of the oil inlet pipe, and the sealing between the upper and lower ends of the inside and the outside of the mesh filter element. Therefore, it is possible to ensure that the oil can be smoothly filtered by the mesh filter element after entering the oil inlet pipe through the oil inlet hole, and it is avoided that the upper and lower ends of the mesh filter element cannot be sealed, so that the oil directly flows into the end head through the gap between the outside of the mesh filter element and the inner wall of the oil inlet pipe, causing the mesh filter element to lose its filtering function. This ensures that during long-term use, the sealing between the mesh filter element and the inner side of the oil inlet pipe is good, and it can always play a good filtering role, thereby ensuring the filtering effect of the hydraulic pump filter.

[0010] As a further supplement to the present application, the second seal comprises: A first sealing lip, which is an elastic sealing ring body, is fixedly sleeved on the outside of a port of the mesh filter element close to one end of the end head, and a side of the first sealing lip close to the first matching ring is in sealing contact with the first matching ring; The second sealing lip is also an elastic sealing ring body. The second sealing lip is fixedly sleeved on the outside of the mesh filter element. The second sealing lip is located on the side of the first sealing lip away from the end head. The side of the second sealing lip close to the first sealing lip is sealed and abutted against the side of the first matching ring away from the first sealing lip.

[0011] Through the arrangement of the first sealing lip and the second sealing lip, when the mesh filter element is snap-fitted and installed in the oil inlet pipe, the lower end of the first sealing lip seals against the upper end of the first matching ring, and the upper end of the second sealing lip seals against the lower end of the first matching ring, thereby achieving a double sealing effect on both the inside and outside. First, it can prevent the oil with impurities that has not passed through the mesh filter element from directly flowing out, and second, it can prevent the filtered oil from forming a backflow and reducing the single filtration efficiency; thereby achieving the effect of ensuring the sealing between the mesh filter element and the inner side of the oil inlet pipe, so that the mesh filter element can always play a good filtering role and avoid a reduction in filtering efficiency or effect.

[0012] As a further supplement to the present application, a pressure-bearing groove is provided on a side of the first sealing lip away from the first mating ring, and the pressure-bearing groove is an inwardly concave ring groove with a semicircular cross-section.

[0013] As a further supplement to the present application, an annular mounting groove is provided at both the upper and lower ends of the first mating ring; An insert ring is fixed on one side of the second sealing lip close to the first matching ring, and the insert ring is seal-inserted into the mounting groove at the lower end of the first matching ring.

[0014] As a further supplement to the present application, a sealing gas ring is provided in the installation groove at the upper end of the first mating ring. The interior of the sealing gas ring is filled with a gas whose volume changes with temperature. The upper end of the sealing gas ring is tightly pressed against the lower end of the first sealing lip.

[0015] When the temperature of the oil in the oil inlet pipe rises, the gas in the sealing gas ring expands due to the heat, causing the sealing gas ring to expand and fully fill the installation groove, and further press against the bottom of the first sealing lip, thereby forming a bent sealing structure, further improving the sealing performance of the first sealing lip and the first mating ring.

[0016] As a further supplement to the present application, a sealing ring is fixedly embedded in the lower end of the first sealing member, the lower end of the first sealing member is sealingly abutted against the upper end of the second matching ring, and the sealing ring is interference connected to the upper end of the second matching ring.

[0017] The first seal and the sealing ring cooperate with each other to press against the upper end of the second matching ring to form a sealing structure, thereby sealing the lower end of the mesh filter element to ensure that the oil will not flow out from between the outer portion of the lower end of the mesh filter element and the inner wall of the oil inlet pipe, thereby ensuring the effectiveness of the mesh filter element filtration.

[0018] As a further supplement to the present application, a pressure-bearing fillet is provided on the intersecting edge between the upper surface of the first sealing member and the outer wall of the first sealing member; A similar rounded corner portion is arranged on the intersecting edge between the lower end surface of the second sealing lip and the outer side wall of the second sealing lip.

[0019] Through the design of the pressure-bearing fillet and the fillet of the second sealing lip, when the oil applies pressure to the first seal and the second sealing lip, the second sealing lip can be pressed more tightly against the first mating ring, and the first seal can be pressed more tightly against the second mating ring, thereby improving the sealing effect when the oil pressure increases.

[0020] As a further supplement to the present application, an outward-expanding guide port is provided at the opening of one end of the mesh filter element close to the end head, and the opening diameter of the guide port close to the end head is larger than the inner diameter of the mesh filter element.

[0021] In summary, the present invention has the following beneficial effects: The first sealing member and the second sealing member are used to achieve a sealed connection between the upper and lower ends of the mesh filter element. Firstly, it is convenient to install the mesh filter element in the oil inlet pipe. Secondly, it is possible to achieve a seal between the outside of the mesh filter element and the inside of the oil inlet pipe, as well as a seal between the inside and the outside of the mesh filter element at the upper and lower ends. Specifically, when the mesh filter element is snap-fitted and installed in the oil inlet pipe, the lower end of the first sealing lip is in sealing contact with the upper end of the first matching ring, and the upper end of the second sealing lip is in sealing contact with the lower end of the first matching ring, thereby achieving a double sealing effect on both the inside and the outside. Firstly, it is possible to prevent the oil with impurities that has not passed through the mesh filter element from flowing out directly. Secondly, it is possible to prevent the filtered oil from backflowing and reducing the single filtration efficiency. Thus, the effect of ensuring the sealing between the mesh filter element and the inside of the oil inlet pipe is achieved, so that the mesh filter element can always play a good filtering role and avoid a reduction in filtration efficiency or effect. After the filtered oil flows out of the mesh filter element, a certain pressure is formed on the upper end of the first sealing lip, especially in the pressure-bearing groove, a pressure is formed in the radial direction of the pressure-bearing groove, so that the first sealing lip is further closely abutted against the upper end of the first matching ring. As the oil pressure increases, the greater the pressure on the first sealing lip, the better the sealing performance between the first sealing lip and the first matching ring, so that the first sealing lip can play a better sealing role as the oil pressure increases; When the upper end of the second sealing lip is tightly sealed against the lower end of the first matching ring, the insert ring seal is inserted into the installation groove to form a T-shaped sealing structure together with the second sealing lip. Compared with the plane contact seal, the sealing effect is better, it is not easy to produce radial displacement along the second sealing lip, and the stability is better; This ensures that the oil can be filtered smoothly by the mesh filter element after entering the oil inlet pipe through the oil inlet hole, avoiding the mesh filter element failing to seal at both ends, which causes the oil to flow directly into the end through the gap between the outside of the mesh filter element and the inner wall of the oil inlet pipe, causing the mesh filter element to lose its filtering function. This ensures that during long-term use, the sealing between the mesh filter element and the inner side of the oil inlet pipe is good, and it can always play a good filtering role, thereby ensuring the filtering effect of the hydraulic pump filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present application; Figure 2 This is a schematic diagram of the three-dimensional structure of the oil inlet pipe and the end head when cut away in the first embodiment of the present application; Figure 3 This is a front view of the mesh filter element, the first seal and the second seal of the first embodiment of the present application; Figure 4 This is a cross-sectional view of the mesh filter element, the first sealing member and the second sealing member of the first embodiment of the present application; Figure 5 This is a cross-sectional view of the oil inlet pipe, the first matching ring, and the second matching ring in the first embodiment of the present application; Figure 6 for Figure 4 A magnified view of the structure at center; Figure 7 for Figure 4 A magnified view of the structure at B in the middle; Figure 8 for Figure 5 A magnified view of the structure at C in the middle; Fig. 9 This is a schematic diagram of the flow of oil through the filter in the first embodiment of the present application; Fig.10 This is a schematic diagram of the pressure bearing of the second seal when the oil passes through the filter in the first embodiment of the present application.

[0023] Description of the numbers in the figure: 1. Oil inlet pipe; 11. Oil inlet hole; 12. First matching ring; 121. Installation groove; 13. Second matching ring; 2. End; 21. Oil outlet; 3. Flange structure; 4. Sealing gasket; 5. Mesh filter element; 51. Guide port; 6. First sealing member; 61. Pressure-bearing fillet; 7. Second sealing member; 71. First sealing lip; 711. Pressure-bearing groove; 72. Second sealing lip; 721. Insert ring; 8. Sealing ring; 9. Sealing gas ring. DETAILED DESCRIPTION

[0024] An implementation method of the present application is described in detail below with reference to the accompanying drawings.

[0025] The first implementation method: The present invention provides a hydraulic pump filter with a sealing structure, see Figure 1-Figure 5 , including an oil inlet pipe 1, a plurality of oil inlet holes 11 for oil liquid to enter are evenly opened on the circumference of the lower part of the oil inlet pipe 1, an end 2 is fixedly connected to the upper end of the oil inlet pipe 1 through a flange structure 3, an oil outlet 21 is integrally formed on one side of the end 2, and a sealing gasket 4 is arranged in the flange structure 3; A first matching ring 12 and a second matching ring 13 are fixed to the inner wall of the oil inlet pipe 1. The first matching ring 12 is located at the intersection between the upper end of the oil inlet pipe 1 and the flange structure 3, and the second matching ring 13 is located at the lower end of the oil inlet pipe 1 and at the lower end of the oil inlet hole 11. A mesh filter element 5 is installed in the oil inlet pipe 1. A second sealing member 7 that cooperates with the first matching ring 12 for sealing is sleeved on the outer side of the upper end of the mesh filter element 5. A first sealing member 6 that cooperates with the second matching ring 13 for sealing is sleeved on the outer side of the lower end of the mesh filter element 5. The mesh filter element 5 is installed in the oil inlet pipe 1 by clamping the first sealing member 6 and the second sealing member 7.

[0026] Based on the above structure, the first sealing member 6 and the second sealing member 7 are used to realize the sealing connection between the upper and lower ends of the mesh filter element 5. Firstly, it is convenient to install the mesh filter element 5 in the oil inlet pipe 1. Secondly, it is possible to realize the sealing between the outside of the mesh filter element 5 and the inside of the oil inlet pipe 1, as well as the sealing between the upper and lower ends of the inside and the outside of the mesh filter element 5. Thus, it is possible to ensure that the oil can be smoothly filtered by the mesh filter element 5 after entering the oil inlet pipe 1 through the oil inlet hole 11, and avoid the upper and lower ends of the mesh filter element 5 being unable to be sealed, thereby causing the oil to directly flow into the terminal 2 through the gap between the outside of the mesh filter element 5 and the inner wall of the oil inlet pipe 1, causing the mesh filter element 5 to lose its filtering function. This ensures that during long-term use, the sealing between the mesh filter element 5 and the inner side of the oil inlet pipe 1 is good, and a good filtering effect can always be achieved, thereby ensuring the filtering effect of the hydraulic pump filter.

[0027] Figure 6 The second seal 7 is shown to include: A first sealing lip 71, which is an elastic sealing ring body, is fixedly sleeved on the outside of a port of the mesh filter element 5 close to one end of the end head 2, and a side of the first sealing lip 71 close to the first matching ring 12 is in sealing contact with the first matching ring 12; The second sealing lip 72 is also an elastic sealing ring body. The second sealing lip 72 is fixedly sleeved on the outside of the mesh filter element 5. The second sealing lip 72 is located on the side of the first sealing lip 71 away from the end head 2. The side of the second sealing lip 72 close to the first sealing lip 71 is sealed and abutted against the side of the first matching ring 12 away from the first sealing lip 71.

[0028] Through the arrangement of the first sealing lip 71 and the second sealing lip 72, when the mesh filter element 5 is snap-fitted and installed in the oil inlet pipe 1, the lower end of the first sealing lip 71 is sealed and abutted against the upper end of the first matching ring 12, and the upper end of the second sealing lip 72 is sealed and abutted against the lower end of the first matching ring 12, thereby achieving a double sealing effect on both the inside and the outside. First, it can prevent the oil with impurities that has not passed through the mesh filter element 5 from directly flowing out, and second, it can prevent the filtered oil from forming a backflow and reducing the single filtration efficiency; thereby achieving the effect of ensuring the sealing between the mesh filter element 5 and the inner side of the oil inlet pipe 1, so that the mesh filter element 5 can always play a good filtering role and avoid a reduction in filtering efficiency or effect.

[0029] Figure 6 It is shown that a pressure-bearing groove 711 is formed on the side of the first sealing lip 71 away from the first matching ring 12 , and the pressure-bearing groove 711 is an inwardly concave ring groove with a semicircular cross section.

[0030] After the filtered oil flows out of the mesh filter element 5, a certain pressure is formed on the first sealing lip 71 at the upper end of the first sealing lip 71, especially a pressure is formed in the pressure groove 711 that diffuses radially along the pressure groove 711, so that the first sealing lip 71 further closely abuts against the upper end of the first matching ring 12. As the oil pressure increases, the greater the pressure on the first sealing lip 71, the better the sealing between the first sealing lip 71 and the first matching ring 12, so that the first sealing lip 71 can play a better sealing role as the oil pressure increases.

[0031] Figure 6 and Figure 8 It is shown that the first matching ring 12 has an annular mounting groove 121 at both the upper and lower ends; An insert ring 721 is fixed to one side of the second sealing lip 72 close to the first mating ring 12 . The insert ring 721 is sealingly inserted into the mounting groove 121 at the lower end of the first mating ring 12 .

[0032] When the upper end of the second sealing lip 72 is sealed against the lower end of the first mating ring 12, the insert ring 721 is sealably inserted in the installation groove 121, and together with the second sealing lip 72 forms a T-shaped sealing structure. Compared with the plane contact seal, the sealing effect is better, it is not easy to produce radial displacement along the second sealing lip 72, and the stability is better.

[0033] Figure 8 It is shown that a sealing gas ring 9 is plugged in the installation groove 121 at the upper end of the first matching ring 12. The sealing gas ring 9 is filled with a gas whose volume changes with temperature. The upper end of the sealing gas ring 9 is tightly pressed against the lower end of the first sealing lip 71.

[0034] When the temperature of the oil in the oil inlet pipe 1 increases, the gas in the sealing gas ring 9 expands due to the heat, causing the sealing gas ring 9 to expand and fully fill the installation groove 121, and further press against the bottom of the first sealing lip 71, thereby forming a bent sealing structure, further improving the sealing performance of the first sealing lip 71 and the first mating ring 12.

[0035] Figure 7 It is shown that a sealing ring 8 is fixedly embedded at the lower end of the first sealing member 6 , the lower end of the first sealing member 6 is sealingly abutted against the upper end of the second matching ring 13 , and the sealing ring 8 is interference connected to the upper end of the second matching ring 13 .

[0036] The first seal 6 cooperates with the sealing ring 8 to press against the upper end of the second matching ring 13 to form a sealing structure, thereby sealing the lower end of the mesh filter element 5 to ensure that the oil does not flow out from between the outer portion of the lower end of the mesh filter element 5 and the inner wall of the oil inlet pipe 1, thereby ensuring the effectiveness of the filtration of the mesh filter element 5.

[0037] Figure 6-Figure 7 It is shown that a pressure-bearing fillet 61 is provided on the intersecting edge between the upper surface of the first sealing member 6 and the outer wall of the first sealing member 6; A similar rounded corner portion is provided on the intersecting edge between the lower end surface of the second sealing lip 72 and the outer side wall of the second sealing lip 72 .

[0038] Through the design of the pressure-bearing fillet 61 and the fillet of the second sealing lip 72, when the oil applies pressure to the first seal 6 and the second sealing lip 72, the second sealing lip 72 can be pressed more tightly against the first mating ring 12, and the first seal 6 can be pressed more tightly against the second mating ring 13, thereby improving the sealing effect when the oil pressure increases.

[0039] Figure 6 It is shown that the opening of the mesh filter element 5 close to the end 2 is provided with an outwardly expanded guide port 51, and the opening diameter of the guide port 51 close to the end 2 is larger than the inner diameter of the mesh filter element 5; When the oil flows through the guide port 51, a pressure relief area is formed, so that the oil can quickly restore its original pressure after passing through the opening of the mesh filter element 5, reducing the influence of the mesh filter element 5 on the oil pressure, so that the pressure loss of the oil is controlled within a reasonable range, and at the same time, it plays a certain protective role on the opening of the mesh filter element 5, avoiding damage to the opening of the mesh filter element 5 caused by sudden pressure changes.

[0040] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A hydraulic pump filter with a sealing structure, comprising an oil inlet pipe (1), a plurality of oil inlet holes (11) for oil to enter are evenly opened on the circumference of the lower part of the oil inlet pipe (1), an end head (2) is fixedly connected to the upper end of the oil inlet pipe (1) through a flange structure (3), an oil outlet (21) is integrally formed on one side of the end head (2), and a sealing gasket (4) is arranged in the flange structure (3), characterized in that: A first matching ring (12) and a second matching ring (13) are fixed to the inner wall of the oil inlet pipe (1), the first matching ring (12) being located at the junction between the upper end of the oil inlet pipe (1) and the flange structure (3), and the second matching ring (13) being located at the lower end of the oil inlet pipe (1) and at the lower end of the oil inlet hole (11); A mesh filter element (5) is installed in the oil inlet pipe (1); a second sealing member (7) is sleeved on the outer side of the upper end of the mesh filter element (5) and is sealed in cooperation with a first matching ring (12); a first sealing member (6) is sleeved on the outer side of the lower end of the mesh filter element (5) and is sealed in cooperation with a second matching ring (13); the mesh filter element (5) is installed in the oil inlet pipe (1) by clamping the first sealing member (6) and the second sealing member (7).

2. A hydraulic pump filter with a sealing structure according to claim 1, characterized in that: The second sealing member (7) comprises: a first sealing lip (71), the first sealing lip (71) being an elastic sealing ring body, the first sealing lip (71) being fixedly sleeved on the outside of a port of the mesh filter element (5) close to one end of the end head (2), the first sealing lip (71) being in sealing contact with the first matching ring (12) on one side close to the first matching ring (12); The second sealing lip (72) is also an elastic sealing ring body. The second sealing lip (72) is fixedly sleeved on the outside of the mesh filter element (5). The second sealing lip (72) is located on a side of the first sealing lip (71) away from the end head (2). A side of the second sealing lip (72) close to the first sealing lip (71) is in sealing contact with a side of the first matching ring (12) away from the first sealing lip (71).

3. A hydraulic pump filter with a sealing structure according to claim 2, characterized in that: A pressure-bearing groove (711) is provided on a side of the first sealing lip (71) away from the first matching ring (12); the pressure-bearing groove (711) is an inwardly concave annular groove with a semicircular cross-section.

4. A hydraulic pump filter with a sealing structure according to claim 3, characterized in that: The first matching ring (12) is provided with an annular mounting groove (121) at both the upper and lower ends; An insert ring (721) is fixed to a side of the second sealing lip (72) close to the first matching ring (12), and the insert ring (721) is sealingly inserted into a mounting groove (121) at the lower end of the first matching ring (12).

5. The hydraulic pump filter with a sealing structure according to claim 4, characterized in that: A sealing gas ring (9) is provided in the mounting groove (121) at the upper end of the first matching ring (12). The sealing gas ring (9) is filled with a gas whose volume changes with temperature. The upper end of the sealing gas ring (9) is tightly abutted against the lower end of the first sealing lip (71).

6. The hydraulic pump filter with a sealing structure according to claim 1, characterized in that: A sealing ring (8) is fixedly embedded in the lower end of the first sealing member (6), the lower end of the first sealing member (6) is sealingly abutted against the upper end of the second matching ring (13), and the sealing ring (8) is interference-connected to the upper end of the second matching ring (13).

7. The hydraulic pump filter with a sealing structure according to claim 2, characterized in that: A pressure-bearing fillet (61) is provided on the intersecting edge between the upper surface of the first sealing member (6) and the outer wall of the first sealing member (6); A similar rounded corner portion is provided on the intersecting edge between the lower end surface of the second sealing lip (72) and the outer side wall of the second sealing lip (72).

8. The hydraulic pump filter with a sealing structure according to claim 1, characterized in that: An outwardly expanded guide opening (51) is provided at an opening of one end of the mesh filter element (5) close to the end head (2); the opening diameter of the guide opening (51) close to the end head (2) is larger than the inner diameter of the mesh filter element (5).

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