Overflow valve

Abstract

The invention relates to the technical field of valves, and discloses an overflow valve which comprises a valve seat assembly, a connecting piece and a valve element, a containing space is formed in the valve seat assembly, and an oil inlet hole communicated with the containing space is formed in the valve seat assembly; at least part of the structure of the connecting piece is arranged in the containing space, and the connecting piece is connected with the valve seat assembly. At least part of the valve element is movably arranged in the valve seat assembly in the axial direction of the connecting piece so that the valve element can block or open the oil inlet hole, the overflow valve comprises a guide part and a matching part, the guide part is in sliding fit with the matching part in the axial direction of the connecting piece, and one of the guide part and the matching part is located on the valve element. And the other one of the guide part and the matching part is positioned on the connecting piece. The guide part and the matching part of the overflow valve are in sliding fit, so that the valve element can be limited in the radial direction, the phenomena of cavitation, flow separation and the like caused by large pressure drop at the oil inlet hole of the valve seat assembly are avoided, the phenomenon of vibration caused by unstable pressure is avoided, and the damping effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a relief valve. Background Art

[0002] In mechanical hydraulic systems, in order to prevent the system pressure from being too high and exceeding the limit value, an overflow valve is usually installed in the system to ensure that the system will not experience pressure overshoot due to excessive pressure, thereby ensuring operational stability and protecting hydraulic equipment.

[0003] The overflow valve generally includes a valve seat assembly and a valve core. The valve seat assembly is provided with an oil inlet hole. The valve core is arranged in the valve seat assembly along the axial direction of the valve seat assembly to open or close the oil inlet hole, and an elastic member is arranged to drive the valve core to block the oil inlet hole. The main problem with this structure is that after the oil inlet hole is opened, the pressure drop at the oil inlet hole of the valve seat assembly is large, which is prone to cavitation and flow separation, resulting in unstable pressure and vibration of the valve core, and high noise. Summary of the invention

[0004] The purpose of the present invention is to provide a relief valve, which solves the technical problem in the prior art that a large pressure drop at the valve port easily causes cavitation and flow separation, resulting in unstable pressure and even vibration and high noise.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a relief valve, comprising:

[0007] A valve seat assembly having a receiving space therein, and an oil inlet hole communicating with the receiving space is provided on the valve seat assembly;

[0008] A connecting member, at least a portion of which is disposed in the accommodating space, and the connecting member is connected to the valve seat assembly;

[0009] A valve core, at least part of which is movably arranged in the valve seat assembly along the axial direction of the connecting piece, so that the valve core can block or open the oil inlet hole, and the relief valve includes a guide portion and a matching portion, and along the axial direction of the connecting piece, the guide portion and the matching portion are slidably matched, one of the guide portion and the matching portion is located on the valve core, and the other of the guide portion and the matching portion is located on the connecting piece.

[0010] The valve core of the relief valve is at least partially movably arranged in the valve seat assembly along the axial direction of the connecting piece, so that the valve core blocks or opens the oil inlet hole. The relief valve includes a guide portion and a matching portion, one of the guide portion and the matching portion is located on the valve core, and the other of the guide portion and the matching portion is located on the connecting piece. The guide portion and the matching portion are slidably matched, so that the valve core can be radially limited to avoid cavitation and flow separation caused by a large pressure drop at the oil inlet hole of the valve seat assembly, avoid the pressure instability and even vibration, and play a shock-absorbing role.

[0011] As a preferred solution of the above-mentioned overflow valve, the guide portion is located at an end of the valve core away from the oil inlet hole, and the matching portion is located at the connecting piece;

[0012] Alternatively, the guiding portion is located on the connecting piece, and the matching portion is located on the valve core.

[0013] The guide part is arranged at the end of the valve core away from the oil inlet hole, which can limit the end of the valve core away from the oil inlet hole to prevent it from vibrating. The guide part is located on the connecting piece, and the matching part is located on the valve core, which can also achieve the guiding effect on the valve core.

[0014] As a preferred solution of the above-mentioned overflow valve, the connecting piece is provided with a slide groove along its axial direction, one end of the valve core is slidably arranged in the slide groove, the matching portion is a guide groove arranged on the side wall of the slide groove, the guide groove has an opening on the outer side wall of the connecting piece, the opening is connected to the accommodating space, the guide portion extends into the guide groove through the opening, and the guide portion is slidably arranged in the guide groove along the axial direction of the connecting piece.

[0015] The valve core slides in the slide groove of the connecting piece, and the guide part slides along the guide groove, thereby guiding the movement of the valve core and preventing the valve core from moving in the radial direction.

[0016] As a preferred solution of the above-mentioned overflow valve, along the radial direction of the connecting member, the guide portion protrudes relative to the valve core, and the guide portion and the valve core are an integral structure.

[0017] Along the radial direction of the connecting piece, the guide part protrudes relative to the valve core, and the guide piece and the valve core are an integrated structure, which has a simple structure, reduces the number of parts, and reduces the steps of assembling the guide piece and the valve core.

[0018] As a preferred solution of the above-mentioned overflow valve, the connecting member is used to separate the accommodating space into a first accommodating sub-space and a second accommodating sub-space, and the first accommodating sub-space is located on a side of the connecting member away from the oil inlet hole;

[0019] The valve core extends into the slide groove and forms a third accommodating space with the wall of the slide groove, and the guide groove is deeper than the bottom surface of the first accommodating sub-space along the axial direction of the connecting member;

[0020] The guide portion moves along the guide groove to connect the first accommodating subspace and the third accommodating space through the guide groove, or to block the connection between the first accommodating subspace and the third accommodating space.

[0021] The guide portion moves along the guide groove to connect the first accommodating subspace and the third accommodating space through the guide groove, so that an oil film is formed in the gap between the third accommodating space and the valve core, and the gap can suppress the radial vibration of the valve core. During the movement of the valve core, the damping effect formed by the viscous friction force of the oil film suppresses the vibration, making the movement of the valve core more stable.

[0022] The guide groove is deeper than the bottom surface of the first accommodating sub-space along the axial direction of the connecting piece, so that the valve core can cut off the connection between the first accommodating sub-space and the third accommodating space. At this time, the oil in the third accommodating space cannot flow into the first accommodating sub-space, and the movement of the valve core is restricted, thereby avoiding the problem of pressure build-up caused by the oil inlet being blocked due to the excessive movement distance of the valve core; at the same time, it can also avoid the impact problem caused by the solid limit.

[0023] As a preferred solution of the above overflow valve, along the circumference of the connecting piece, the distance between two opposite walls defining the guide groove is L, and 0.5 mm≤L≤1 mm.

[0024] The above arrangement can achieve effective communication between the first accommodating subspace and the third accommodating space; and can play a better guiding role for the guide part.

[0025] As a preferred solution of the above-mentioned overflow valve, the valve seat assembly includes a detachably connected valve body and a valve seat, one end of the valve body is provided with the oil inlet hole, the other end of the valve body is connected to the valve seat, and the first accommodating sub-space is formed between the connecting member and the valve seat.

[0026] The valve seat assembly includes a detachable valve body and a valve seat, and is easy to disassemble and assemble.

[0027] As a preferred solution of the above-mentioned overflow valve, the connecting piece includes:

[0028] A connecting body, on which a receiving groove is arranged, wherein the notch of the receiving groove is arranged toward the oil inlet hole;

[0029] A connecting rod, one end of which is connected to the connecting body, and the other end of which passes through the valve seat, the connecting rod is provided with the slide groove which is connected to the accommodating groove, the guide groove extends from the bottom of the accommodating groove to the connecting rod, and the guide groove is deeper than the bottom surface of the first cavity along the axial direction of the connecting piece.

[0030] The above-mentioned structure of the connecting piece is simple, and can limit the radial movement of the valve core to prevent the valve core from vibrating in the radial direction; it can also limit the axial movement of the valve core to prevent the valve core from moving too far in the axial direction, resulting in the valve core blocking the oil inlet hole.

[0031] As a preferred solution of the above-mentioned overflow valve, the valve seat comprises:

[0032] A valve seat bottom wall portion and a valve seat side wall portion arranged in the circumferential direction of the valve seat bottom wall portion, the valve seat bottom wall portion is connected to the valve seat side wall portion and encloses a valve seat guide groove, a part of the structure of the connecting body is arranged in the valve seat guide groove, a through hole is arranged on the valve seat bottom wall portion, an end of the connecting rod away from the connecting body is passed through the through hole, the guide groove extends into the valve seat bottom wall portion, the groove bottom inner wall of the valve seat guide groove is used to divide the guide groove into a first section guide groove and a second section guide groove, the second section guide groove is arranged on a side of the first section guide groove away from the oil inlet hole;

[0033] When the guide portion extends into the first guide groove, the first accommodating subspace and the third accommodating space are connected through the guide groove;

[0034] When the guide portion extends from the first section guide groove into the second section guide groove, the first accommodating subspace and the third accommodating space are separated.

[0035] The bottom wall of the valve seat is connected to the side wall of the valve seat and forms a valve seat guide groove. Part of the structure of the connecting body is arranged in the valve seat guide groove. The connecting rod passes through the through hole on the bottom wall of the valve seat. When the valve core moves along the axial direction of the valve seat assembly, when the guide portion extends into the first section of the guide groove, the first accommodating subspace and the third accommodating space are connected through the guide groove. At this time, an oil film is formed in the gap between the third accommodating space and the valve core. During the movement of the valve core, the damping effect formed by the viscous friction force of the oil film suppresses the vibration of the valve core, so that the movement of the valve core is more stable.

[0036] When the guide portion extends from the first section of the guide groove into the second section of the guide groove, the first accommodating sub-space and the third accommodating space are separated. At this time, the oil in the third accommodating space cannot flow into the first accommodating sub-space, and the movement of the valve core is restricted, thereby avoiding the problem of pressure build-up due to blockage of the oil inlet caused by excessive movement of the valve core; at the same time, it can also avoid the impact problem caused by solid limit.

[0037] As a preferred solution of the above-mentioned overflow valve, a plurality of pressure equalizing grooves are arranged in the circumferential direction of one end of the valve core provided with the guide portion.

[0038] The setting of the pressure equalizing groove can balance the radial force of the valve core and avoid the movement of the valve core from being stuck.

[0039] As a preferred solution of the above-mentioned overflow valve, the connecting member is adjustably arranged in the accommodating space along the axial direction of the valve seat assembly, and one end of the connecting member facing away from the oil inlet hole extends out of the valve seat assembly;

[0040] An elastic component is arranged between the connecting piece and one end of the valve core close to the oil inlet hole.

[0041] The connecting piece is adjustably arranged in the accommodating space along the axial direction of the valve seat assembly. By adjusting the position of the connecting piece, the elastic force of the elastic assembly pressing the valve core can be adjusted, thereby adjusting the pressure of the valve core to open the oil inlet hole.

[0042] Beneficial effects of the present invention:

[0043] The overflow valve proposed in the present invention has a valve core movably arranged in the valve seat assembly along the axial part of the connecting piece, so that the valve core blocks or opens the oil inlet hole. The overflow valve includes a guide part and a matching part, one of the guide part and the matching part is located on the valve core, and the other of the guide part and the matching part is located on the connecting piece. The guide part and the matching part are slidably matched, so that the valve core can be radially limited, avoiding cavitation and flow separation caused by a large pressure drop at the oil inlet hole of the valve seat assembly, avoiding the pressure instability and even vibration, and playing a shock-absorbing role. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a first structural schematic diagram of the overflow valve provided by the present invention;

[0045] Figure 2 is a second structural schematic diagram of the overflow valve provided by the present invention;

[0046] Figure 3 yes Figure 2 Sectional view along line AA;

[0047] Figure 4 yes Figure 2 Sectional view along line BB;

[0048] Figure 5 is a first structural schematic diagram of a connecting piece provided by the present invention;

[0049] Figure 6 is a second structural schematic diagram of the connecting piece provided by the present invention;

[0050] Figure 7 is a third structural schematic diagram of the connecting piece provided by the present invention;

[0051] Figure 8 yes Figure 7 Sectional view along line CC;

[0052] Fig. 9 is a cross-sectional view of a valve seat provided by the present invention;

[0053] Fig.10 It is a structural schematic diagram of the valve core provided by the present invention.

[0054] In the figure:

[0055] 10. valve seat assembly; 11. valve body; 111. oil inlet hole; 112. oil return hole; 12. valve seat; 120. valve seat guide groove; 121. valve seat bottom wall; 1211. through hole; 122. valve seat side wall; 131. first accommodating subspace; 132. second accommodating subspace;

[0056] 20. Connecting member; 21. Connecting body; 211. Accommodating groove; 22. Connecting rod; 221. Sliding groove; 23. Guide groove; 231. First section guide groove; 232. Second section guide groove;

[0057] 30. valve core; 31. guide portion; 32. pressure equalizing groove;

[0058] 40. elastic component; 41. elastic member; 42. mounting seat;

[0059] 60. A third accommodating space; 70. A locking member. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0061] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0063] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0064] The overflow valve generally includes a valve seat assembly and a valve core. The valve seat assembly is provided with an oil inlet hole. The valve core is arranged in the valve seat assembly along the axial direction of the valve seat assembly to open or close the oil inlet hole. An elastic member is arranged between the end of the valve core that is away from the oil inlet hole and the valve seat assembly, and the valve core is driven by the elastic member to block the oil inlet hole. The main problem with this structure is that after the oil inlet hole is opened, the valve core is not constrained in the radial direction. At the same time, the pressure drop at the oil inlet hole of the valve seat assembly is large, which is prone to cavitation and flow separation, resulting in unstable pressure and vibration of the valve core, and high noise.

[0065] In order to solve the above problems, Figure 1-Figure 4 As shown, this embodiment provides a relief valve, including a valve seat assembly 10, a connecting piece 20 and a valve core 30. The valve seat assembly 10 is provided with a accommodating space, and the valve seat assembly 10 is provided with an oil inlet hole 111 and an oil return hole 112 which are connected to the accommodating space; at least part of the structure of the connecting piece 20 is arranged in the accommodating space, and the connecting piece 20 is connected to the valve seat assembly 10; along the axial direction of the connecting piece 20, at least part of the valve core 30 is movably arranged in the valve seat assembly 10 so that the valve core 30 blocks or opens the oil inlet hole 111, and the relief valve includes a guide portion 31 and a matching portion, and along the axial direction of the connecting piece 20, the guide portion 31 is slidably matched with the matching portion, one of the guide portion 31 and the matching portion is located on the valve core 30, and the other of the guide portion 31 and the matching portion is located on the connecting piece 20.

[0066] The valve core 30 of the relief valve is movably arranged in the valve seat assembly 10 along the axial part of the connecting piece 20, so that the valve core 30 can be radially limited to avoid cavitation and flow separation caused by a large pressure drop at the oil inlet hole 111 of the valve seat assembly 10, avoid the pressure instability and vibration of the valve core 30, and play a role in shock absorption and noise reduction.

[0067] In this embodiment, the guide portion 31 is located at the end of the valve core 30 away from the oil inlet hole 111, and the matching portion is located at the connector 20. The guide portion 31 is located at the end of the valve core 30 away from the oil inlet hole 111, so that the guide portion 31 has a better shock-absorbing and noise-reducing effect on the valve core 30. Preferably, along the radial direction of the connector 20, the guide portion 31 is raised relative to the valve core 30, and the guide portion 31 and the valve core 30 are an integrated structure, the overall structure is simple, the number of parts is reduced, and the steps of assembling the guide portion 31 and the valve core 30 are reduced. In other embodiments, the guide portion 31 can also be located at the connector 20, and the matching portion can be located at the valve core 30.

[0068] like Figure 4 As shown, the connecting member 20 is provided with a slide groove 221 along its axial direction, and one end of the valve core 30 provided with a guide portion 31 is slidably disposed in the slide groove 221. The matching portion is a guide groove 23 disposed on the side wall of the slide groove 221. The guide groove 23 has an opening on the outer side wall of the connecting member 20, and the opening is connected to the accommodating space. The guide portion 31 extends into the guide groove 23 through the opening. Along the axial direction of the connecting member 20, the guide portion 31 is slidably disposed in the guide groove 23. The valve core 30 slides in the slide groove 221 of the connecting member 20, and the guide portion 31 slides along the guide groove 23, thereby guiding the movement of the valve core 30 and preventing the valve core 30 from moving in the radial direction. In this embodiment, along the circumference of the connecting member 20, the spacing between the two opposite walls of the guide groove 23 is defined as L (see Figure 5 ), 0.5mm≤L≤1mm, for example, L can be: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0069] Furthermore, if Figure 3 and Figure 4 As shown, the connecting member 20 is used to divide the accommodating space into a first accommodating sub-space 131 and a second accommodating sub-space 132. The first accommodating sub-space 131 is located on the side of the connecting member 20 away from the oil inlet hole 111; the valve core 30 extends into the slide groove 221, and forms a third accommodating space 60 between the valve core 30 and the wall of the slide groove 221. The guide groove 23 is deeper than the bottom surface of the first accommodating sub-space 131 along the axial direction of the connecting member 20; the guide portion 31 moves along the guide groove 23 to connect the first accommodating sub-space 131 and the third accommodating sub-space 60 through the guide groove 23, or to cut off the connection between the first accommodating sub-space 131 and the third accommodating space 60.

[0070] The guide portion 31 moves along the guide groove 23 to connect the first accommodating subspace 131 and the third accommodating space 60 through the guide groove 23, so that an oil film is formed in the gap between the third accommodating space 60 and the valve core 30, and the gap can suppress the radial vibration of the valve core 30. During the movement of the valve core 30, the damping effect formed by the viscous friction force of the oil film suppresses the vibration, making the movement of the valve core 30 more stable; the guide groove 23 is deeper than the bottom surface of the first accommodating subspace 131 along the axial direction of the connecting member 20, so that the valve core 30 can cut off the connection between the first accommodating subspace 131 and the third accommodating space 60. At this time, the oil in the third accommodating space 60 cannot flow into the first accommodating subspace 131, and the movement of the valve core 30 is restricted, thereby avoiding the problem of pressure holding caused by the valve core 30 blocking the oil inlet hole 111 due to the excessive movement distance of the valve core 30; at the same time, it can also avoid the problem of collision caused by limiting by a solid limiting structure.

[0071] like Figure 3 and Figure 4 As shown, the valve seat assembly 10 includes a detachably connected valve body 11 and a valve seat 12, and the valve seat assembly 10 is convenient to disassemble. An oil inlet hole 111 and an oil return hole 112 are provided at one end of the valve body 11, and the other end of the valve body 11 is connected to the valve seat 12, and the above-mentioned first accommodating subspace 131 is formed between the connecting member 20 and the valve seat 12.

[0072] like Figure 5-Figure 8 As shown, the connecting member 20 includes a connecting body 21 and a connecting rod 22. The connecting body 21 is provided with a receiving groove 211, and the notch of the receiving groove 211 is arranged toward the oil inlet hole 111. One end of the connecting rod 22 is connected to the connecting body 21, and the other end of the connecting rod 22 passes through the valve seat 12. The connecting rod 22 is provided with a sliding groove 221 connected to the receiving groove 211. The guide groove 23 extends from the groove bottom of the receiving groove 211 to the connecting rod 22, and the guide groove 23 is deeper than the bottom surface of the first receiving subspace 131. The above structure of the connecting member 20 is simple, and can limit the radial movement of the valve core 30 to prevent the valve core 30 from vibrating in the radial direction; and can also limit the axial movement of the valve core 30 to prevent the valve core 30 from moving too far in the axial direction, resulting in the phenomenon that the valve core 30 blocks the oil inlet hole 111.

[0073] like Fig. 9As shown, the valve seat 12 includes a valve seat bottom wall portion 121 and a valve seat side wall portion 122 arranged circumferentially of the valve seat bottom wall portion 121, the valve seat bottom wall portion 121 is connected to the valve seat side wall portion 122 and encloses a valve seat guide groove 120, and part of the structure of the connecting body 21 is arranged in the valve seat guide groove 120 and is sealed with the valve body 11 through a sealing member. The bottom wall 121 of the valve seat is provided with a through hole 1211, and one end of the connecting rod 22 which is away from the connecting body 21 passes through the through hole 1211, and the guide groove 23 extends into the bottom wall 121 of the valve seat. The inner wall of the bottom of the valve seat guide groove 120 is used to separate the guide groove 23 into a first section of the guide groove 231 and a second section of the guide groove 232, and the second section of the guide groove 232 is arranged on the side of the first section of the guide groove 231 away from the oil inlet hole 111; when the guide portion 31 extends into the first section of the guide groove 231, the first accommodating subspace 131 and the third accommodating space 60 are connected through the guide groove 23; when the guide portion 31 extends from the first section of the guide groove 231 into the second section of the guide groove 232, the first accommodating subspace 131 and the third accommodating space 60 are separated. The first section of the guide groove 231 and the second section of the guide groove 232 are separated by the inner wall of the bottom of the valve seat guide groove 120. When the position of the dividing line changes, the first section guide groove 231 and the second section guide groove 232 also change accordingly.

[0074] When the valve core 30 moves axially along the valve seat assembly 10, when the guide portion 31 extends into the first section guide groove 231, the first accommodating sub-space 131 and the third accommodating space 60 can be connected through the guide groove 23. At this time, an oil film is formed in the gap between the third accommodating space 60 and the valve core 30. During the movement of the valve core 30, the damping effect formed by the viscous friction force of the oil film suppresses the vibration of the valve core 30, so that the movement of the valve core 30 is more stable; when the guide portion 31 extends from the first section guide groove 231 into the second section guide groove 232, the first accommodating sub-space 131 and the third accommodating space 60 are separated. At this time, the oil in the third accommodating space 60 cannot flow into the first accommodating sub-space 131, and the movement of the valve core 30 is restricted, thereby avoiding the problem of pressure build-up caused by the valve core 30 blocking the oil inlet hole 111 due to the excessive movement distance of the valve core 30; at the same time, it can also avoid the problem of collision caused by limiting by a solid limiting structure.

[0075] Alternatively, if Fig.10As shown, a plurality of pressure equalizing grooves 32 are provided in the circumference of one end of the valve core 30 provided with the guide portion 31. The provision of the pressure equalizing grooves 32 can balance the radial force of the valve core 30 and prevent the movement of the valve core 30 from being stuck. One pressure equalizing groove 32 can be provided in the circumference of one end of the valve core 30 provided with the guide portion 31, or a plurality of pressure equalizing grooves 32 can be provided. The plurality of pressure equalizing grooves 32 are provided at intervals along the axial direction of the valve core 30, and the pressure equalizing effect is improved by providing a plurality of pressure equalizing grooves 32. The specific number of the pressure equalizing grooves 32 can be set according to demand, and is not specifically limited here. In the present embodiment, the groove width of the pressure equalizing groove 32 (the distance between the two opposite walls of the pressure equalizing groove 32 along the axial direction of the valve core 30) ranges from 0.2mm to 0.5mm, for example, it can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0076] Optionally, continue to see Fig.10 , at least two guide portions 31 are provided on the valve core 30, and each guide portion 31 is arranged at intervals along the circumference of the valve core 30; at least two guide grooves 23 are provided on the connecting piece 20, and each guide portion 31 is slidably matched with a guide groove 23. The cooperation of at least two guide portions 31 and the guide grooves 23 can make the movement of the valve core 30 more stable and achieve a better noise reduction effect. In this embodiment, two guide portions 31 are provided on the valve core 30, and the two guide portions 31 are arranged at equal intervals along the circumference of the valve core 30 to make the movement of the valve core 30 more stable. In other embodiments, the number of guide portions 31 can also be three, four or more, and the number of guide portions 31 is not specifically limited here, and can be adjusted according to specific needs.

[0077] In this embodiment, the connecting member 20 is adjustably arranged in the accommodation space along the axial direction of the valve seat assembly 10, and the end of the connecting member 20 away from the oil inlet hole 111 extends out of the valve seat assembly 10; an elastic component 40 is arranged between the connecting member 20 and the end of the valve core 30 close to the oil inlet hole 111. The connecting member 20 is adjustably arranged in the accommodation space along the axial direction of the valve seat assembly 10, and the elastic force of the elastic component 40 pressing the valve core 30 can be adjusted by adjusting the position of the connecting member 20, thereby adjusting the pressure of the valve core 30 to open the oil inlet hole 111.

[0078] It should be noted that when the connecting member 20 adjusts the elastic force of the elastic component 40 pressing the valve core 30 , the relative position of the valve seat 12 and the guide portion 31 will not be affected, so the axial limit position of the valve core 30 will not change.

[0079] Specifically, the connecting body 21 of the connecting member 20 is threadedly connected to the valve seat side wall portion 122 of the valve seat 12, and the connecting body 21 and the valve body 11 are sealed by a sealing member. The connecting rod 22 passes through the valve seat assembly 10 through the through hole 1211 of the valve seat 12 and is locked by the locking member 70. In this embodiment, the locking member 70 is a nut, which is threadedly connected to the connecting rod 22 and abuts against the valve seat 12. When adjusting the position of the connecting member 20, the nut is loosened and the connecting member 20 is screwed to adjust the position of the connecting member 20, thereby adjusting the elastic force of the elastic member 41 on the valve core 30.

[0080] like Figure 3 and Figure 4 As shown, the elastic component 40 includes an elastic member 41 and a mounting seat 42. The mounting seat 42 is arranged at one end of the valve core 30 close to the oil inlet hole 111. The elastic member 41 is sleeved on the valve core 30, one end of which abuts against the mounting seat 42, and the other end extends into the receiving groove 211 of the connecting body 21 and abuts against the bottom of the receiving groove 211. In this embodiment, the elastic member 41 is a spring, which has a simple structure and low cost.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Relief valve, characterized in that: include: A valve seat assembly (10) having a receiving space therein, and an oil inlet hole (111) communicating with the receiving space is provided on the valve seat assembly (10); A connecting member (20), at least a portion of the structure of the connecting member (20) is disposed in the accommodating space, and the connecting member (20) is connected to the valve seat assembly (10); A valve core (30), at least part of which is movably arranged in the valve seat assembly (10) along the axial direction of the connecting piece (20) so that the valve core (30) can block or open the oil inlet hole (111), and the overflow valve comprises a guide portion (31) and a matching portion, and along the axial direction of the connecting piece (20), the guide portion (31) is slidably matched with the matching portion, one of the guide portion (31) and the matching portion is located on the valve core (30), and the other of the guide portion (31) and the matching portion is located on the connecting piece (20).

2. The relief valve according to claim 1, characterized in that: The guide portion (31) is located at an end of the valve core (30) away from the oil inlet hole (111), and the matching portion is located at the connecting member (20); Alternatively, the guiding portion (31) is located on the connecting member (20), and the matching portion is located on the valve core (30).

3. The relief valve according to claim 2, characterized in that: The connecting member (20) is provided with a slide groove (221) along its axial direction, and one end of the valve core (30) is slidably arranged in the slide groove (221); the matching portion is a guide groove (23) arranged on the side wall (122) of the slide groove (221); the guide groove (23) has an opening on the outer side wall of the connecting member (20), and the opening is connected to the accommodating space; the guide portion (31) extends into the guide groove (23) through the opening; along the axial direction of the connecting member (20), the guide portion (31) is slidably arranged in the guide groove (23).

4. The relief valve according to claim 3, characterized in that: Along the radial direction of the connecting member (20), the guide portion (31) protrudes relative to the valve core (30), and the guide portion (31) and the valve core (30) are an integral structure.

5. The relief valve according to claim 3, characterized in that: The connecting member (20) is used to separate the accommodating space into a first accommodating sub-space (131) and a second accommodating sub-space (132); the first accommodating sub-space (131) is located on a side of the connecting member (20) away from the oil inlet hole (111); The valve core (30) extends into the slide groove (221) and forms a third accommodating space (60) with the wall of the slide groove (221); the guide groove (23) is deeper than the bottom surface of the first accommodating subspace (131) along the axial direction of the connecting member (20); The guide portion (31) moves along the guide groove (23) to connect the first accommodating subspace (131) and the third accommodating space (60) through the guide groove (23), or to block the connection between the first accommodating subspace (131) and the third accommodating space (60).

6. The relief valve according to claim 3, characterized in that: Along the circumference of the connecting member (20), the distance between two opposite walls defining the guide groove (23) is L, and 0.5 mm ≤ L ≤ 1 mm.

7. The relief valve according to claim 5, characterized in that: The valve seat assembly (10) comprises a detachably connected valve body (11) and a valve seat (12); one end of the valve body (11) is provided with the oil inlet hole (111); the other end of the valve body (11) is connected to the valve seat (12); and the first accommodating subspace (131) is formed between the connecting member (20) and the valve seat (12).

8. The relief valve according to claim 7, characterized in that: The connecting member (20) comprises: A connecting body (21) is provided with a receiving groove (211), wherein the notch of the receiving groove (211) is arranged toward the oil inlet hole (111); A connecting rod (22), one end of which is connected to the connecting body (21), and the other end of which passes through the valve seat (12); the connecting rod (22) is provided with a slide groove (221) which is connected to the accommodating groove (211); and the guide groove (23) extends from the bottom of the accommodating groove (211) to the connecting rod (22).

9. The relief valve according to claim 8, characterized in that: The valve seat (12) comprises: The valve seat bottom wall portion (121) and the valve seat side wall portion (122) are arranged on the periphery of the valve seat bottom wall portion (121), the valve seat bottom wall portion (121) and the valve seat side wall portion (122) are connected to form a valve seat guide groove (120), a part of the structure of the connecting body (21) is arranged in the valve seat guide groove (120), a through hole (1211) is arranged on the valve seat bottom wall portion (121), and the connecting rod (22) is away from One end of the connecting body (21) passes through the penetration hole (1211), and the guide groove (23) extends into the bottom wall portion (121) of the valve seat, and the inner wall of the bottom of the valve seat guide groove (120) is used to separate the guide groove (23) into a first section guide groove (231) and a second section guide groove (232), and the second section guide groove (232) is arranged on a side of the first section guide groove (231) away from the oil inlet hole (111); When the guide portion (31) extends into the first section guide groove (231), the first accommodating subspace (131) and the third accommodating space (60) are connected via the guide groove (23); When the guide portion (31) extends from the first section guide groove (231) into the second section guide groove (232), the first accommodating subspace (131) and the third accommodating space (60) are separated.

10. The overflow valve according to any one of claims 2 to 7, characterized in that: A plurality of pressure equalizing grooves (32) are arranged in the circumferential direction of one end of the valve core (30) where the guide portion (31) is arranged.

11. The overflow valve according to any one of claims 1 to 7, characterized in that: The connecting piece (20) is arranged in the accommodating space in an adjustable manner along the axial direction of the valve seat assembly (10), and an end of the connecting piece (20) facing away from the oil inlet hole (111) protrudes out of the valve seat assembly (10); An elastic component (40) is provided between the connecting piece (20) and an end of the valve core (30) close to the oil inlet hole (111).

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