A hydraulic pump filter with a sealing structure

Abstract

The present invention relates to a hydraulic pump filter with a sealing structure applied to the field of hydraulic pumps, comprising a first mating ring and a second mating ring fixed to the inner wall of an oil inlet pipe, the first mating ring being located at the intersection between the upper end of the oil inlet pipe and the flange structure, the second mating ring being located at the lower end of the oil inlet pipe and simultaneously located at the lower end of the oil inlet hole; a mesh filter element is installed in the oil inlet pipe, the outer side of the upper end of the mesh filter element is sleeved with a second sealing member which is mated and sealed with the first mating ring, the outer side of the lower end of the mesh filter element is sleeved with a first sealing member which is mated and sealed with the second mating ring, the mesh filter element is clamped and installed in the oil inlet pipe by the first and second sealing members, and the above-mentioned first mating ring, second mating ring, first sealing member and second sealing member are adopted to achieve good sealing between the mesh filter element and the inner side of the oil inlet pipe during long-term use, and can always play a good filtering role, thereby ensuring the filtering effect of the hydraulic pump filter.

Description

Technical Field

[0001] The present invention relates to a filter, and 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 electric motor, sucking oil from the hydraulic tank, forming pressurized oil and discharging 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 the 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 existing technology 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, an end head is installed on the top of the outer cylinder, and the side of the end head is connected to an oil outlet pipe. The end face of the oil outlet pipe is provided with a sealing mechanism, which 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 end 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 normal processing.

[0006] Existing hydraulic pump filters usually have a filter element (such as a mesh filter element) installed in them. However, 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) due to the increase in oil pressure, causing the oil entering the filter to flow out without passing through the filter element, losing the filtering function 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 perform a filtering function.

[0008] 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 portion of the oil inlet pipe, an end piece 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 piece, and a sealing gasket is provided in the flange structure;

[0009] A first mating ring and a second mating ring are fixed to the inner wall of the oil inlet pipe. The first mating ring is located at the intersection between the upper end of the oil inlet pipe and the flange structure, and the second mating ring is located at the lower end of the oil inlet pipe and at the lower end of the oil inlet hole.

[0010] A mesh filter element is installed in the oil inlet pipe. The outer side of the upper end of the mesh filter element is provided with a second sealing member that cooperates with the first matching ring for sealing. The outer side of the lower end of the mesh filter element is provided with a first sealing member that cooperates with the second matching ring for sealing. The mesh filter element is installed in the oil inlet pipe through the first sealing member and the second sealing member.

[0011] In the hydraulic pump filter with a sealing structure, the first sealing member and the second sealing member are used to realize the sealed connection between the upper and lower ends of the mesh filter element. Firstly, it is easy 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, as well as the sealing between the upper and lower ends of the mesh filter element and the inside of the mesh filter element. This ensures that the oil can be smoothly filtered by the mesh filter element after entering the oil inlet pipe through the oil inlet hole, and avoids the situation where the upper and lower ends of the mesh filter element cannot be sealed, thereby causing the oil to directly flow 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.

[0012] 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, ensuring the filtering effect of the hydraulic pump filter.

[0013] As a further supplement to this application, the second seal comprises:

[0014] The first sealing lip is an elastic sealing ring body, and the first sealing lip is fixedly sleeved on the outside of the port of the mesh filter element near one end of the end, and the side of the first sealing lip near the first matching ring is in sealing contact with the first matching ring;

[0015] 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 with the side of the first matching ring away from the first sealing lip.

[0016] By setting 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 flowing out directly, 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 the reduction of filtration efficiency or effect.

[0017] 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.

[0018] As a further supplement to the present application, annular mounting grooves are provided at both the upper and lower ends of the first mating ring;

[0019] An insert ring is fixed on one side of the second sealing lip close to the first matching ring, and the insert ring is sealingly inserted into the mounting groove at the lower end of the first matching ring.

[0020] As a further supplement to this application, a sealing gas ring is provided in the mounting groove at the upper end of the first mating ring. 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.

[0021] 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.

[0022] 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 mating ring, and the sealing ring is interference connected to the upper end of the second mating ring.

[0023] 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, ensuring that the oil will not flow out from between the outside 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's filtration.

[0024] 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;

[0025] A similar rounded corner portion is provided on the intersecting edge between the lower end surface of the second sealing lip and the outer side wall of the second sealing lip.

[0026] 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.

[0027] 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.

[0028] In summary, the present invention has the following beneficial effects:

[0029] 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 upper and lower ends of the mesh filter element and the outside. Specifically, 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 the outside. Firstly, it can prevent the oil with impurities that has not passed through the mesh filter element from flowing out directly. Secondly, it can prevent the filtered oil from forming a backflow and reducing the single filtration efficiency. Thus, the effect of ensuring the sealing between the mesh filter element and the inner side 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.

[0030] After the filtered oil flows out of the mesh filter element, a certain pressure is exerted on the upper end of the first sealing lip, especially in the pressure-bearing groove, where pressure is formed and diffuses radially along the pressure-bearing groove, so that the first sealing lip is further tightly abutted against the upper end of the first mating ring. As the oil pressure increases, the pressure exerted on the first sealing lip increases, and the sealing performance between the first sealing lip and the first mating ring becomes better, so that the first sealing lip can play a better sealing role as the oil pressure increases.

[0031] When the upper end of the second sealing lip seals against the lower end of the first mating ring, the insert ring seal is inserted into the mounting groove, forming a T-shaped sealing structure with the second sealing lip. Compared with a flat contact seal, the sealing effect is better, it is less likely to cause radial displacement along the second sealing lip, and has better stability;

[0032] This ensures that the oil can be smoothly filtered by the mesh filter element after entering the oil inlet pipe through the oil inlet hole, avoiding the situation where the upper and lower ends of the mesh filter element cannot be sealed, causing the oil to directly flow 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;

[0033] 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, ensuring the filtering effect of the hydraulic pump filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the three-dimensional structure of the oil inlet pipe and the end head when viewed in section in the first embodiment of the present application;

[0036] 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;

[0037] Figure 4 This is a cross-sectional view of the mesh filter element, the first seal and the second seal in the first embodiment of the present application;

[0038] Figure 5 This is a cross-sectional view of the oil inlet pipe, the first mating ring, and the second mating ring in the first embodiment of the present application;

[0039] Figure 6 for Figure 4 A magnified view of the structure at center A;

[0040] Figure 7 for Figure 4 A magnified view of the structure at point B in the middle;

[0041] Figure 8 for Figure 5 A magnified view of the structure at point C in the middle;

[0042] Figure 9 This is a schematic diagram of the flow of oil through the filter in the first embodiment of the present application;

[0043] Figure 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.

[0044] Description of the numbers in the figure:

[0045] 1. Oil inlet pipe; 11. Oil inlet hole; 12. First mating ring; 121. Mounting groove; 13. Second mating 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

[0046] An embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0047] The first implementation method:

[0048] The present invention provides a hydraulic pump filter with a sealing structure, please refer to 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, the upper end of the oil inlet pipe 1 is fixedly connected to the end head 2 through a flange structure 3, and an oil outlet 21 is integrally formed on one side of the end head 2, and a sealing gasket 4 is provided in the flange structure 3;

[0049] A first mating ring 12 and a second mating ring 13 are fixed to the inner wall of the oil inlet pipe 1. The first mating ring 12 is located at the intersection between the upper end of the oil inlet pipe 1 and the flange structure 3. The second mating 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.

[0050] A mesh filter element 5 is installed in the oil inlet pipe 1. The outer side of the upper end of the mesh filter element 5 is provided with a second sealing member 7 that cooperates with the first matching ring 12 for sealing. The outer side of the lower end of the mesh filter element 5 is provided with a first sealing member 6 that cooperates with the second matching ring 13 for sealing. 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.

[0051] Based on the above structure, the first sealing member 6 and the second sealing member 7 are used to realize the sealed connection between the upper and lower ends of the mesh filter element 5. Firstly, it is easy 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 mesh filter element 5 and the inside of the mesh filter element 5. This ensures 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 avoids the upper and lower ends of the mesh filter element 5 being unable to seal, thereby causing the oil to directly flow into the end head 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.

[0052] 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.

[0053] Figure 6 The second seal 7 is shown to comprise:

[0054] The first sealing lip 71 is an elastic sealing ring body. The first sealing lip 71 is fixedly sleeved on the outside of the port of the mesh filter element 5 close to the end 2. The side of the first sealing lip 71 close to the first matching ring 12 is in sealing contact with the first matching ring 12;

[0055] 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 with the side of the first mating ring 12 away from the first sealing lip 71.

[0056] 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 in sealing contact with the upper end of the first matching ring 12, and the upper end of the second sealing lip 72 is in sealing contact with 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. 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 filtration efficiency or effect.

[0057] 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 mating ring 12 . The pressure-bearing groove 711 is an inwardly concave ring groove with a semicircular cross section.

[0058] After the filtered oil flows out of the mesh filter element 5, a certain pressure is formed on the upper end of the first sealing lip 71, especially in the pressure groove 711, a pressure is formed that diffuses radially along the pressure groove 711, so that the first sealing lip 71 is further tightly abutted against the upper end of the first mating 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 mating ring 12, so that the first sealing lip 71 can play a better sealing role as the oil pressure increases.

[0059] Figure 6 and Figure 8 It is shown that the first mating ring 12 has an annular mounting groove 121 at both the upper and lower ends;

[0060] An insert ring 721 is fixed to a 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 .

[0061] 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 into the mounting 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.

[0062] Figure 8 It is shown that a sealing gas ring 9 is plugged into the mounting groove 121 at the upper end of the first mating 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 .

[0063] When the temperature of the oil in the oil inlet pipe 1 rises, 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.

[0064] 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 seals 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 .

[0065] The first seal 6 and the sealing ring 8 cooperate with each other 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, ensuring that the oil will not flow out from between the outside 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.

[0066] 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;

[0067] A similar rounded 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 .

[0068] 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.

[0069] Figure 6 The mesh filter element 5 is shown to have an outward-expanded guide opening 51 at its opening near the end 2. The opening diameter of the guide opening 51 near the end 2 is larger than the inner diameter of the mesh filter element 5.

[0070] When the oil flows through the guide port 51, a pressure relief area is formed, so that the oil quickly recovers 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 plays a certain protective role for the opening of the mesh filter element 5, avoiding damage to the opening of the mesh filter element 5 caused by sudden pressure changes.

[0071] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. 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 protection scope 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 liquid to enter are evenly opened on the circumference of the lower portion 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 provided 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), wherein 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) is sleeved on the outer side of the upper end of the mesh filter element (5) and is sealed with a first matching ring (12), and a first sealing member (6) is sleeved on the outer side of the lower end of the mesh filter element (5) and is sealed with a second matching ring (13), and 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); 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), and 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); a second sealing lip (72), the second sealing lip (72) also being an elastic sealing ring body, the second sealing lip (72) being fixedly sleeved on the outside of the mesh filter element (5), the second sealing lip (72) being located on the side of the first sealing lip (71) away from the end head (2), and the side of the second sealing lip (72) close to the first sealing lip (71) being in sealing contact with the side of the first mating ring (12) away from the first sealing lip (71); A pressure-bearing groove (711) is provided on a 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; The first matching ring (12) is provided with annular mounting grooves (121) at both the upper and lower ends; An insert ring (721) is fixed on one side of the second sealing lip (72) close to the first matching ring (12), and the insert ring (721) is sealingly inserted into the mounting groove (121) at the lower end of the first matching ring (12); A sealing gas ring (9) is provided in the mounting groove (121) at the upper end of the first mating 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).

2. 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).

3. The hydraulic pump filter with a sealing structure according to claim 1, 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).

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

Images