Self-piloted sealing valve

Abstract

The utility model discloses a kind of self-aligning sealing valve parts, including valve core, valve seat and self-aligning sealing assembly, self-aligning sealing assembly is set to the one end of valve core close to valve seat, self-aligning sealing assembly includes sealing element and limiting structure, sealing element is set on limiting structure.The utility model innovatively uses self-aligning sealing assembly design, through the self-adapting dynamic sealing pair structure formed between sealing ball and valve seat, effectively solve the sealing failure problem caused by coaxiality deviation of traditional valve.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic control technology, and specifically relates to an improved sealing structure scheme for a high-pressure relief valve, which is particularly suitable for solving the sealing failure problem caused by the misalignment of the valve needle and valve oil hole due to machining errors. Background Technology

[0002] Traditional high-pressure relief valves achieve sealing through a rigid fit between the valve needle tip and the oil hole. However, in actual manufacturing, the valve needle axis and the valve oil hole axis are prone to coaxiality deviation (typically exceeding ±0.1mm). Under high-pressure conditions (>30MPa), even slight eccentricity can lead to the following problems:

[0003] Seal failure: Local gaps form at the contact surfaces, oil leaks along the eccentric gap, and pressure holding performance decreases;

[0004] Uneven wear damage: The valve needle is continuously pressed on one side, resulting in uneven wear of the sealing surface;

[0005] Response lag: Under overpressure, the valve needle must overcome eccentric resistance to open, affecting the safety valve's operational accuracy. Existing improvement solutions (such as improving machining accuracy and adding a guide sleeve) suffer from high cost and complex structure. Therefore, a low-cost, highly reliable adaptive sealing structure is urgently needed. Utility Model Content

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a self-aligning sealing valve, which compensates for processing errors through the innovative mechanical design of the self-aligning sealing assembly to achieve reliable sealing under eccentric working conditions.

[0007] A self-aligning sealing valve includes a valve core, a valve seat, and a self-aligning sealing assembly. The self-aligning sealing assembly is disposed at the end of the valve core near the valve seat. The self-aligning sealing assembly includes a sealing element and a limiting structure, with the sealing element disposed on the limiting structure. The sealing element can be movably or fixedly disposed on the limiting structure.

[0008] In the aforementioned self-aligning sealing valve, the limiting structure is a claw-type retainer, which includes a frustum-shaped frame and at least three limiting claws arranged in a uniform circular array on the frustum-shaped frame. By limiting the degree of freedom of movement of the sealing element through the limiting structure, the sealing element with a certain degree of freedom of movement forms an adaptive dynamic sealing pair structure with the valve seat, thereby sealing the oil hole 21 of the valve seat using the sealing element with a certain degree of freedom of movement.

[0009] In the aforementioned self-aligning sealing valve, the limiting claw includes a fixing part for fixing to the frustum-shaped frame, and the limiting claw also includes a riveting claw part and an arc-shaped surface for forming a first receiving space.

[0010] In the aforementioned self-aligning sealing valve, the sealing element is a sealing ball, which is movably disposed in the first receiving space. The gap d between the sealing ball and the first receiving space is greater than or equal to 0.2 mm. The maximum height h1 of the first receiving space is less than the diameter of the sealing ball but greater than the radius of the sealing ball.

[0011] In the aforementioned self-aligning sealing valve, the limiting structure is a soft covering, which includes a flexible body with elastic deformation and a second receiving space disposed within the flexible body. The sealing element is a sealing ball disposed in the second receiving space.

[0012] In the aforementioned self-aligning sealing valve, the maximum height h2 of the second accommodating space is less than the diameter of the sealing ball; the soft body is a rubber soft body, a polyurethane soft body, or a silicone soft body.

[0013] In the aforementioned self-aligning sealing valve, the soft body includes a first circular outer surface and a second circular outer surface, wherein the diameter of the first circular outer surface is larger than the diameter of the second circular outer surface.

[0014] In the aforementioned self-aligning sealing valve, the inner wall of the second receiving space is arc-shaped, and the second receiving space is formed by the second circular outer surface being concave into the soft body.

[0015] In the aforementioned self-aligning sealing valve, the soft body is provided with a stepped groove that cooperates with the valve core, and the stepped groove communicates with the second accommodating space.

[0016] In the aforementioned self-aligning sealing valve, the limiting structure includes a ball seat and a limiting sleeve structure. The ball seat is integrally formed or fixedly connected to the valve core, and the limiting sleeve structure is integrally formed or fixedly connected to the valve seat.

[0017] In the aforementioned self-aligning sealing valve, the sealing element is a sealing ball, and a limiting sleeve structure is fitted onto the ball seat to form a third accommodating space that allows the sealing ball to move. The end of the ball seat away from the valve core is provided with a groove, and the sealing ball is disposed in the third accommodating space and can float in the groove of the ball seat.

[0018] In the aforementioned self-aligning sealing valve, a funnel-shaped channel is provided inside the limiting sleeve structure, and the funnel-shaped channel and the groove of the ball seat form the third receiving space.

[0019] In the aforementioned self-aligning sealing valve, the valve seat is provided with a T-shaped oil passage, and the funnel-shaped passage is connected to the T-shaped oil passage.

[0020] In the aforementioned self-aligning sealing valve, the sealing element is provided with a positioning groove, the limiting structure is a positioning post set on the valve core, and an elastic soft layer is provided between the groove wall of the positioning groove and the positioning post.

[0021] In the aforementioned self-aligning sealing valve, the valve core includes a circular end face, and the positioning post is disposed on the circular end face and coaxially disposed with the valve core.

[0022] In the aforementioned self-aligning sealing valve, the sealing element includes a spherical arc surface and an annular plane. The spherical arc surface is connected to the outer ring line of the annular plane, and the annular plane is in contact with the circular end face.

[0023] In the aforementioned self-aligning sealing valve, the limiting structure is a spring element, one end of which is fixed to the valve core, and the other end is connected to the sealing ball.

[0024] In the aforementioned self-aligning sealing valve, the spring is a tower spring, which covers the end of the valve core near the valve seat, and the sealing ball is mounted on the valve core through the tower spring cover.

[0025] In the aforementioned self-aligning sealing valve, the sealing element is a sealing ball, and the limiting structure is a cylindrical groove with a height h3 less than the diameter of the sealing ball but greater than the radius of the sealing ball. The port of the cylindrical groove is provided with an inclined wall that restricts the movement of the sealing ball within the cylindrical groove.

[0026] Compared with existing technologies, this utility model innovatively adopts a self-aligning sealing component design. Through the adaptive dynamic sealing pair structure formed between the sealing ball and the valve seat, it effectively solves the sealing failure problem caused by coaxiality deviation in traditional valves. This structure not only achieves dynamic compensation sealing of the valve seat oil hole, significantly improving sealing reliability, but also possesses the following technical advantages: 1) Automatic compensation alignment significantly reduces valve needle wear damage and extends service life; 2) The optimized dynamic sealing structure effectively reduces eccentric resistance, improving valve response speed; 3) Adaptive characteristics ensure stable sealing performance under various operating conditions. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the claw-type retainer of this utility model;

[0030] Figure 3 This is a height diagram of the utility model (h1).

[0031] Figure 4 This is a schematic diagram of another embodiment of the present invention;

[0032] Figure 5 This is a structural schematic diagram of the soft-covered component of this utility model;

[0033] Figure 6 This is a structural schematic diagram of another embodiment of the present utility model;

[0034] Figure 7 This is a schematic diagram of the ball seat structure of this utility model;

[0035] Figure 8 This is a structural schematic diagram of another embodiment of the present utility model;

[0036] Figure 9 This is a utility model Figure 7 Schematic diagram of the middle sealing component;

[0037] Figure 10 This is a structural schematic diagram of another embodiment of the present utility model;

[0038] Figure 11 This is a structural schematic diagram of another embodiment of the present invention.

[0039] Figure 12 This is a cross-sectional view of a self-aligning sealing valve of this utility model installed on a pump body.

[0040] Figure label:

[0041] 1-Valve core, 2-Valve seat, 3-Self-aligning sealing assembly, 4-Sealing ball, 5-Claw retainer, 51-Frustum-shaped frame, 52-Limiting claw, 521-Fixing part, 522-First receiving space, 523-Riveting claw part, 524-Arc-shaped surface, 6-Soft covering, 61-Soft body, 611-First circular outer surface, 612-Second circular outer surface, 62-Second receiving space, 63-Step groove, ball seat, 71-Groove, 8-Limiting sleeve structure, 81-Funnel-shaped channel, 9-Third receiving space, 10-T-type oil passage, 11-Positioning groove, 12-Pump body, 13-Positioning column, 14-Elastic soft layer, 15-Circular end face, 16-Spherical arc surface, 17-Annular plane, 18-Spring component, 19-Cylindrical groove, 20-Sloping wall, 21-Oil hole.

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. The specific implementation structure of the present invention includes, but is not limited to, the implementation structure protected by the present invention or illustrated in the drawings.

[0044] Embodiment 1 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2, and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at the end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure, with the sealing element disposed on the limiting structure. The limiting structure precisely constrains the motion freedom of the sealing element, ensuring that the sealing element has controllable compensation displacement, and constructs a dynamically adaptive sealing pair structure with the valve seat 2. In this example, the sealing element in this self-aligning sealing valve generates a micro-amplitude compensation movement under hydraulic load, and through a dynamic adjustment mechanism of contact stress, achieves real-time contact sealing of the oil hole 21 of the valve seat 2.

[0045] To achieve the adaptive sealing function of the seal, the limiting structure is designed as a claw-type retainer 5. The claw-type retainer 5 includes a frustum-shaped frame 51 and at least three limiting claws 52 arranged in a uniform circular array on the frustum-shaped frame 51. Depending on the structural specifications of the valve core 1, the number of limiting claws 52 can be configured as 4, 5, or 6, and arranged in a uniform circular array to form a first receiving space 522 for limiting the seal.

[0046] Furthermore, the limiting claw 52 includes a fixing portion 521 for fixing to the frustum-shaped frame 51, and the limiting claw 52 also includes a riveting claw portion 523 and an arc-shaped surface 524 for forming the first receiving space 522. The entire limiting claw 52 is fixedly mounted on the frustum-shaped frame 51 by the fixing portion 521. To save manufacturing costs, the limiting claw 52 and the frustum-shaped frame 51 can be designed as a single piece.

[0047] The sealing element is a sealing ball 4. To ensure that the sealing ball 4 is movably positioned within the first receiving space 522, the gap d between the sealing ball 4 and the first receiving space 522 is greater than or equal to 0.2 mm. To achieve the sealing function of the sealing ball 4 on the oil hole of the valve seat 2, the maximum height h1 of the first receiving space 522 is less than the diameter of the sealing ball 4 but greater than the radius of the sealing ball 4. The sealing ball 4 is in rigid contact with the frustum-shaped frame 51. Under hydraulic load, the sealing ball undergoes a slight compensation movement, achieving real-time contact sealing of the oil hole 21 of the valve seat 2 through a dynamic adjustment mechanism of contact stress. During pressure fluctuations, the sealing ball 4 automatically adjusts its contact position through displacement compensation, ensuring that the sealing interface always maintains the optimal spatial alignment with the oil hole 21 of the valve seat 2. This innovative structure not only compensates for machining errors of 0.03~0.05 mm, achieving zero-leakage sealing within a high pressure fluctuation range, but also significantly improves the service reliability of the high-pressure sealing pair.

[0048] In this example, the sealing ball 4 moves closer to or further away from the valve seat 2 as the valve core 1 moves. The self-aligning sealing assembly 3 restricts the freedom of movement of the sealing ball 4 placed in the first receiving space 522 by limiting the claw retainer 5. This allows the sealing ball 4 and the valve seat 2 to form an adaptive dynamic sealing pair, overcoming the technical problem of coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1 in the prior art. This effectively seals the oil hole 21 of the valve seat 2, reducing wear damage and improving response speed.

[0049] Embodiment 2 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2 and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at one end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure.

[0050] Specifically, the limiting structure used to restrict the degree of freedom of movement of the sealing ball 4 is a soft covering 6. The soft covering 6 includes a soft body 61 that is integrally formed and has elastic deformation, and a second receiving space 62 disposed in the soft body 61. The sealing element is the sealing ball 4, which is disposed in the second receiving space 62.

[0051] Specifically, the soft body 61 includes a first circular outer surface 611 and a second circular outer surface 612, and the diameter of the first circular outer surface 611 is larger than the diameter of the second circular outer surface 612, thereby designing a soft body 61 structure that is narrow at the top and wide at the bottom to improve the stability of the soft covering 6.

[0052] To restrict the freedom of movement of the sealing ball 4, the maximum height h2 of the second accommodating space 62 is less than the diameter of the sealing ball 4 and greater than the radius of the sealing ball 4; the specific soft body 61 can be a rubber soft body, polyurethane soft body or silicone soft body, and is fixedly installed on the valve core 1 by pressure bonding.

[0053] To accommodate the sealing ball 4, the inner wall of the second accommodating space 62 is an arc shape that matches the sealing ball 4. The second accommodating space 62 is formed by the second circular outer surface 612 being recessed into the soft body 61.

[0054] The soft body 61 has a stepped groove 63 that mates with the valve core 1, and the stepped groove 63 communicates with the second receiving space 62. The sealing ball 4 is in rigid contact with the valve core 1. The soft body 61 is installed on the valve core 1 through the stepped groove 63.

[0055] In this example, the sealing ball 4 moves closer to or further away from the valve seat 2 as the valve core 1 moves. The self-aligning sealing assembly 3 restricts the freedom of movement of the sealing ball 4 placed in the second receiving space 62 by limiting the structure of the self-aligning sealing assembly 3, namely the soft covering 6. This allows the sealing ball 4 and the valve seat 2 to form an adaptive dynamic sealing pair, overcoming the technical problem of coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1 in the prior art. This effectively seals the oil hole 21 of the valve seat 2, reducing wear damage and improving response speed.

[0056] Embodiment 3 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2 and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at one end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure.

[0057] Specifically, the limiting structure includes a ball seat 7 and a limiting sleeve structure 8. The ball seat 7 is integrally formed or fixedly connected to the valve core 1, and the limiting sleeve structure 8 is integrally formed or fixedly connected to the valve seat 2.

[0058] Furthermore, the sealing element is a sealing ball 4, and the limiting sleeve structure 8 is fitted on the ball seat 7 to form a third receiving space 9 that allows the sealing ball 4 to move. A groove 71 is provided at the end of the ball seat 7 away from the valve core 1. The sealing ball 4 is disposed in the third receiving space 9 and can float in the groove 71 of the ball seat 7.

[0059] Specifically, the limiting sleeve structure 8 is provided with a funnel-shaped channel 81, which forms a third receiving space 9 with the groove 71 of the ball seat 7.

[0060] The valve seat 2 is provided with a T-shaped oil passage 10, and the funnel-shaped passage 81 is connected to the T-shaped oil passage 10.

[0061] In this example, the sealing ball 4 moves closer to or further away from the valve seat 2 as the valve core 1 moves. The self-aligning sealing assembly 3 restricts the freedom of movement of the sealing ball 4 placed in the third receiving space 9 through the limiting structure of the ball seat 7 and the limiting sleeve structure 8, so that the sealing ball 4 and the valve seat 2 form an adaptive dynamic sealing pair. This overcomes the technical problem of the coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1 in the prior art, thereby forming an effective seal on the oil hole 21 of the valve seat 2, which can reduce wear damage and improve the response speed.

[0062] Embodiment 4 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2, and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at one end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure. A positioning groove 11 is provided inside the sealing element. The limiting structure is a positioning post 13 disposed on the valve core 1. The positioning post 13 can be a circular positioning post or a square positioning post. An elastic soft layer 14 is provided between the groove wall of the positioning groove 11 and the positioning post 13. The valve core 1 includes a circular end face 15. The positioning post 13 is disposed on the circular end face 15 and is coaxially disposed with the valve core 1. The sealing element includes a spherical arc surface 16 and an annular plane 17. The spherical arc surface 16 is connected to the outer ring line of the annular plane 17. The annular plane 17 is in contact with the circular end face 15.

[0063] In this example, the seal formed by the spherical arc surface 16 and the annular plane 17 moves closer to or further away from the valve seat 2 as the valve core 1 moves. The sealing ball 4 can be installed on the valve core 1 by the limiting structure of the self-aligning sealing assembly 3, namely the positioning post 13. The elastic properties of the elastic soft layer 14 enable the sealing ball 4 and the valve seat 2 to form an adaptive dynamic sealing pair, thereby achieving the sealing effect of the sealing ball 4 on the oil hole of the valve seat. This can overcome the technical problem of coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1 in the prior art, while reducing wear damage and improving the response speed.

[0064] Embodiment 5 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2, and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at the end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure. The limiting structure is a spring element 18, one end of which is fixed to the valve core 1 by welding or snap-fit. The spring element 18 is a tower spring, which covers the end of the valve core 1 near the valve seat 2. The sealing ball 4 is disposed on the valve core 1 through the tower spring cover.

[0065] In this example, the self-aligning sealing assembly 3, i.e., the spring 18, restricts the freedom of movement of the sealing ball 4. The elastic properties of the spring 18 enable the sealing ball 4 and the valve seat 2 to form an adaptive dynamic sealing pair, thereby achieving the sealing effect of the sealing ball 4 on the oil hole of the valve seat. Thus, by using this self-aligning sealing valve, the problem of sealing failure caused by the coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1 can be overcome, while reducing wear damage and improving response speed.

[0066] Embodiment 6 of this utility model: A self-aligning sealing valve includes a valve core 1, a valve seat 2, and a self-aligning sealing assembly 3. The self-aligning sealing assembly 3 is disposed at one end of the valve core 1 near the valve seat 2. The self-aligning sealing assembly 3 includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure. The sealing element is a sealing ball 4. The limiting structure is a cylindrical groove 19 with a height h3 smaller than the diameter of the sealing ball 4 but larger than the radius of the sealing ball 4. The cylindrical groove 19 includes an inclined wall 20 that restricts the sealing ball 4 to move within the cylindrical groove 19. In this example, the sealing ball 4 moves closer to or further away from the valve seat 2 as the valve core 1 moves. The self-aligning sealing assembly 3 restricts the freedom of movement of the sealing ball 4 through its limiting structure, namely the cylindrical groove 19. The inclined wall 20 of the cylindrical groove 19 forms an opening smaller than the diameter of the sealing ball 4, thereby confining the sealing ball 4 within the cylindrical groove 19. The sealing ball 4, with a certain degree of freedom of movement, can form an adaptive dynamic sealing pair with the valve seat 2, thus achieving the sealing effect of the sealing ball 4 on the oil hole of the valve seat 2. Therefore, using this self-aligning sealing valve component can solve the problem of sealing failure caused by the coaxiality deviation between the oil hole 21 of the valve seat 2 and the valve core 1, while reducing wear damage and improving response speed.

Claims

1. A self-aligning sealing valve, characterized in that: It includes a valve core (1), a valve seat (2) and a self-aligning sealing assembly (3). The self-aligning sealing assembly (3) is disposed at one end of the valve core (1) near the valve seat (2). The self-aligning sealing assembly (3) includes a sealing element and a limiting structure. The sealing element is disposed on the limiting structure.

2. The self-aligning sealing valve according to claim 1, characterized in that: The limiting structure is a claw retainer (5), which includes a frustum-shaped frame (51) and at least three limiting claws (52) arranged in a circular uniform array on the frustum-shaped frame (51).

3. A self-aligning sealing valve according to claim 2, characterized in that: The limiting claw (52) includes a fixing part (521) for fixing to the frustum-shaped frame (51), and the limiting claw (52) also includes a riveting claw part (523) and an arc-shaped surface (524) for forming the first receiving space (522).

4. A self-aligning sealing valve according to claim 3, characterized in that: The sealing element is a sealing ball (4), which is movably disposed in the first accommodating space (522). The gap d between the sealing ball (4) and the first accommodating space (522) is greater than or equal to 0.2 mm. The maximum height h1 of the first accommodating space (522) is less than the diameter of the sealing ball and greater than the radius of the sealing ball (4).

5. A self-aligning sealing valve according to claim 1, characterized in that: The limiting structure is a soft covering (6), which includes a soft body (61) with elastic deformation and a second receiving space (62) disposed in the soft body (61). The sealing element is a sealing ball (4), which is disposed in the second receiving space (62).

6. A self-aligning sealing valve according to claim 5, characterized in that: The maximum height h2 of the second accommodating space (62) is less than the diameter of the sealing ball (4) and greater than the radius of the sealing ball (4); the soft body (61) is a rubber soft body, a polyurethane soft body or a silicone soft body.

7. A self-aligning sealing valve according to claim 6, characterized in that: The software (61) includes a first circular outer surface (611) and a second circular outer surface (612), wherein the diameter of the first circular outer surface (611) is larger than the diameter of the second circular outer surface (612).

8. A self-aligning sealing valve according to claim 7, characterized in that: The inner wall of the second accommodating space (62) is arc-shaped, and the second accommodating space (62) is formed by the second circular outer surface (612) concave into the soft body (61).

9. A self-aligning sealing valve according to claim 8, characterized in that: The software (61) is provided with a stepped groove (63) that cooperates with the valve core (1), and the stepped groove (63) is connected to the second accommodating space (62).

10. A self-aligning sealing valve according to claim 1, characterized in that: The limiting structure includes a ball seat (7) and a limiting sleeve structure (8). The ball seat (7) is integrally formed or fixedly connected to the valve core (1), and the limiting sleeve structure (8) is integrally formed or fixedly connected to the valve seat (2).

11. A self-aligning sealing valve according to claim 10, characterized in that: The sealing element is a sealing ball (4), and the limiting sleeve structure (8) is fitted on the ball seat (7) and forms a third accommodating space (9) that allows the sealing ball (4) to move. The ball seat (7) has a groove (71) at one end away from the valve core (1). The sealing ball (4) is placed in the third accommodating space (9) and can float in the groove (71) of the ball seat (7).

12. A self-aligning sealing valve according to claim 11, characterized in that: The limiting sleeve structure (8) is provided with a funnel-shaped channel (81), and the funnel-shaped channel (81) and the groove (71) of the ball seat (7) form the third receiving space (9).

13. A self-aligning sealing valve according to claim 12, characterized in that: The valve seat (2) is provided with a T-shaped oil passage (10), and the funnel-shaped channel (81) is connected to the T-shaped oil passage (10).

14. A self-aligning sealing valve according to claim 1, characterized in that: The sealing element is provided with a positioning groove (11), and the limiting structure is a positioning post (13) provided on the valve core (1). An elastic soft layer (14) is provided between the groove wall of the positioning groove (11) and the positioning post (13).

15. A self-aligning sealing valve according to claim 14, characterized in that: The valve core (1) includes a circular end face (15), and the positioning post (13) is disposed on the circular end face (15) and coaxially disposed with the valve core (1).

16. A self-aligning sealing valve according to claim 15, characterized in that: The seal includes a spherical arc surface (16) and an annular plane (17), the spherical arc surface (16) is connected to the outer ring of the annular plane (17), and the annular plane (17) is in contact with the circular end face (15).

17. A self-aligning sealing valve according to claim 1, characterized in that: The limiting structure is a spring (18), one end of which is fixed to the valve core (1).

18. A self-aligning sealing valve according to claim 17, characterized in that: The spring element (18) is a tower spring, which is attached to the end of the valve core (1) near the valve seat (2). The sealing element is a sealing ball (4), which is attached to the valve core (1) by the tower spring.

19. A self-aligning sealing valve according to claim 1, characterized in that: The sealing element is a sealing ball (4), and the limiting structure is a cylindrical groove (19) with a height h3 less than the diameter of the sealing ball (4) and greater than the radius of the sealing ball (4). At the port of the cylindrical groove (19), there is an inclined wall (20) that restricts the sealing ball (4) to move within the cylindrical groove (19).

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