Overflow valve

Abstract

The invention belongs to the technical field of valves, and discloses an overflow valve. The overflow valve comprises a valve seat and a valve element assembly, an oil inlet and an oil return opening are formed in the valve seat, the valve element assembly is arranged in the valve seat in a sliding mode to adjust the communication state of the oil inlet and the oil return opening, an adjusting piece is installed at one end of the valve seat, a pressure adjusting spring is arranged outside the valve element assembly in a sleeving mode, one end of the pressure adjusting spring abuts against the valve element assembly, and the other end of the pressure adjusting spring abuts against the adjusting piece. The inerter comprises a lead screw, a flywheel and a ball, the lead screw is connected with the end, close to the adjusting part, of the valve element assembly, the flywheel is arranged outside the lead screw in a sleeving mode, at least part of the ball is arranged between the flywheel and the lead screw in a rolling mode, and linear motion of the lead screw can be converted into rotating motion of the flywheel through the ball. The overflow valve provided by the invention has the functions of vibration and noise reduction, meanwhile, the friction force is reduced, the energy loss is reduced, and the service life of the overflow valve is prolonged.

Description

Technical Field

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

[0002] The overflow valve is generally used in hydraulic equipment and mainly plays the role of constant pressure and flow, pressure stabilization, system unloading and safety protection. The existing overflow valve mainly includes a valve seat, a valve core and a pressure regulating spring. The valve core is slidably arranged in the valve seat and compresses the pressure regulating spring.

[0003] However, due to the continuous change of pressure, the valve core will keep moving under the combined action of the hydraulic pressure and the pressure-regulating spring. When the excitation frequency of the oil pressure is close to the frequency of the valve core plus spring system itself, resonance will occur. At this time, the valve core will keep hitting the valve port of the valve seat, generating vibration and noise. This frequent opening and closing will also cause the valve core and the valve seat to be subjected to high-frequency rigid impacts with each other, resulting in large wear. At the same time, it will also reduce the reliability of the pressure-regulating spring, valve seat and valve core, thereby reducing the reliability and service life of the entire relief valve.

[0004] Therefore, there is an urgent need to provide a relief valve to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a relief valve which has the function of reducing vibration and noise, while reducing friction, lowering energy loss and extending the service life of the relief valve.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The overflow valve comprises a valve seat and a valve core assembly, wherein the valve seat is provided with an oil inlet and an oil return port, the valve core assembly is slidably arranged in the valve seat to adjust the connection state of the oil inlet and the oil return port, an adjustment seat is installed at one end of the valve seat, a pressure regulating spring is arranged on the outer sleeve of the valve core assembly, one end of the pressure regulating spring abuts against the valve core assembly, and the other end abuts against the adjustment seat, and also comprises an inertia container, the inertia container comprises a screw rod, a flywheel and a ball, the screw rod is connected to one end of the valve core assembly close to the adjustment seat, the flywheel is sleeved outside the screw rod, at least part of the ball is rollingly arranged between the flywheel and the screw rod, and the linear motion of the screw rod can be converted into the rotational motion of the flywheel through the ball.

[0008] As an optional solution, an outer spiral groove is provided on the outer circumferential surface of the screw rod, and an inner spiral groove is provided on the inner circumferential surface of the flywheel. The inner spiral groove is at least partially opposite to the outer spiral groove and forms a spiral channel, and the ball is arranged to roll in the spiral channel.

[0009] As an optional solution, the inertia container also includes a flywheel disc, which is sleeved outside the screw rod and fixedly connected to the adjustment seat, one end of the flywheel close to the valve core assembly is axially limited with the flywheel disc, and the other end of the flywheel is axially limited with the adjustment seat.

[0010] As an optional solution, a first outer ball is arranged rollingly between one end of the flywheel close to the flywheel disc and the flywheel disc;

[0011] And / or, a second outer ball is rollingly arranged between one end of the flywheel close to the adjustment seat and the adjustment seat.

[0012] As an optional solution, a first annular groove is formed on an end surface of the flywheel close to the flywheel disc, and a second annular groove opposite to the first annular groove is formed on the flywheel disc, and the first annular groove and the second annular groove form a first annular raceway, and the first outer ball is rollingly arranged in the first annular raceway;

[0013] And / or, a third annular groove is provided on an end surface of the flywheel close to the adjustment seat, a fourth annular groove opposite to the third annular groove is provided on the adjustment seat, the third annular groove and the fourth annular groove form a second annular raceway, and the second outer ball is rolled in the second annular raceway.

[0014] As an optional solution, a first accommodating groove is defined in the adjustment seat, an inner diameter of the first accommodating groove is larger than an outer diameter of the flywheel, and at least a portion of the flywheel is located in the first accommodating groove.

[0015] As an optional solution, a second accommodating groove is further provided in the adjustment seat, and the second accommodating groove is located on the side of the first accommodating groove close to the valve core assembly and is coaxially connected to the first accommodating groove. The inner diameter of the second accommodating groove is greater than or equal to the inner diameter of the first accommodating groove, and at least a portion of the flywheel disc is located in the second accommodating groove.

[0016] As an optional solution, the valve core assembly includes a valve core body and a connecting rod, the valve core body is used to achieve connection or cutoff between the oil inlet and the oil return port, one end of the connecting rod is connected to the valve core body, and the other end of the connecting rod is connected to the screw rod.

[0017] As an optional solution, the valve core assembly also includes a spring seat, which is sleeved on the outside of the valve core body, and the adjusting seat is provided with an accommodating cavity at one end close to the pressure-adjusting spring, one end of the pressure-adjusting spring rests on the spring seat, and the other end of the pressure-adjusting spring extends into the accommodating cavity and rests on the bottom of the accommodating cavity.

[0018] As an optional solution, the adjustment seat includes an end cover, an anti-slip component and a sealing component, at least part of the inertia container is located in the end cover, at least part of the end cover is located in the valve seat, the sealing component is sleeved outside the end cover, and along the radial direction of the valve seat, one side of the sealing component abuts the valve seat, and the other side of the sealing component abuts the end cover, at least part of the anti-slip component is located between the end cover and the valve seat, the anti-slip component is connected to the valve seat, and the anti-slip component is threadedly connected to the end cover to achieve adjustable axial position of the end cover.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a relief valve. When the hydraulic pressure drives the valve core assembly to move axially, the valve core assembly drives the screw rod to move. When the screw rod moves, multiple balls are rotated, and the rolling of the balls drives the flywheel to rotate. The screw rod and the flywheel are in contact through the balls, and there is rolling friction between the two, thereby reducing friction and reducing energy loss. When the screw rod reciprocates in the axial direction, the flywheel will not have a large displacement in the axial direction, and the main movement mode is rotation. When the pressure regulating spring drives the valve core assembly to vibrate repeatedly, the inertia force of the flywheel generates a corresponding reaction force to offset the inertia force of the pressure regulating spring, thereby achieving the functions of vibration reduction, energy absorption and noise reduction, and avoiding the valve core assembly from repeatedly hitting the valve seat, thereby ensuring the reliability of the pressure regulating spring, the valve seat and the valve core assembly, and thus improving the reliability and service life of the entire relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the overflow valve provided by the present invention;

[0022] Figure 2 is a cross-sectional view of the relief valve provided by the present invention;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 is a cross-sectional view of an inert container provided by the present invention;

[0025] Figure 5 It is a schematic diagram of the cooperation between the screw rod and the ball provided by the present invention;

[0026] Figure 6 It is a cross-sectional view of the inertia container provided by the present invention with the screw rod hidden.

[0027] In the figure:

[0028] 1. Valve seat; 11. Oil inlet; 12. Oil return port; 13. Abutment portion;

[0029] 2. Valve core assembly; 21. Valve core body; 211. Conical sealing surface; 22. Connecting rod; 23. Spring seat; 3. Pressure regulating spring;

[0030] 4. Adjustment seat; 41. Fourth annular groove; 42. First accommodating groove; 43. Second accommodating groove; 44. Accommodating cavity; 45. Penetration groove; 46. End cover; 47. Anti-slip member; 48. Sealing member; 49. Nut;

[0031] 5. Inertia container; 501. Spiral channel; 502. First annular raceway; 503. Second annular raceway; 51. Screw; 511. External spiral groove; 52. Flywheel; 521. Internal spiral groove; 522. First annular groove; 523. Third annular groove; 53. Ball; 54. Flywheel disc; 541. Second annular groove; 55. First outer ball; 56. Second outer ball. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a relief valve, including a valve seat 1 and a valve core assembly 2. The valve seat 1 is provided with an oil inlet 11 and an oil return port 12. The valve core assembly 2 is slidably arranged in the valve seat 1 to adjust the connection state of the oil inlet 11 and the oil return port 12. An adjustment seat 4 is plugged and installed at one end of the valve seat 1. A pressure regulating spring 3 is provided on the outer sleeve of the valve core assembly 2. One end of the pressure regulating spring 3 abuts against the valve core assembly 2, and the other end abuts against the adjustment seat 4. Figure 1 As shown, the oil inlet 11 and the oil return port 12 are both opened on the peripheral side of the valve seat 1, and the oil inlet 11 and the oil return port 12 are both provided in plurality, and the plurality of oil inlet 11 and the plurality of oil return ports 12 are spaced and evenly arranged around the circumference of the valve seat 1.

[0037] Combination Figure 2 , the hydraulic oil enters from the oil inlet 11 of the valve seat 1, and the hydraulic pressure acts on the valve core assembly 2 to the right. When the hydraulic pressure acting on the valve core assembly 2 is greater than the elastic force of the pressure regulating spring 3 (the relief valve start-up pressure), the valve core assembly 2 moves to the right to open the oil inlet 11. At this time, the oil inlet 11 and the oil return port 12 are connected, and the hydraulic oil entering from the oil inlet 11 flows out from the oil return port 12, so that the excess flow overflows back to the oil tank, thereby playing the role of constant pressure and flow, pressure stabilization, system unloading and safety protection. When the hydraulic pressure acting on the valve core assembly 2 is less than the elastic force of the pressure regulating spring 3, the valve core assembly 2 moves to the left to cut off the connection between the oil inlet 11 and the oil return port 12. When it is necessary to adjust the relief valve start-up pressure, change the depth of the adjusting seat 4 screwed into the valve seat 1 to change the length of the pressure regulating spring 3, so that the pressure regulating spring 3 is further compressed or relaxed, thereby changing the start-up pressure.

[0038] However, in the prior art, due to the continuous change of pressure, the valve core will move continuously under the joint action of the hydraulic pressure and the pressure-regulating spring 3. When the excitation frequency of the oil pressure is close to the frequency of the valve core plus spring system itself, resonance will occur. At this time, the valve core will continuously hit the valve port of the valve seat 1, generating vibration and noise. Such frequent opening and closing will also cause the valve core and the valve seat 1 to be subjected to high-frequency rigid impacts with each other, resulting in large wear. At the same time, it will also reduce the reliability of the pressure-regulating spring 3, the valve seat 1 and the valve core, thereby reducing the reliability and service life of the entire relief valve.

[0039] In order to solve the above problems, Figure 2 and Figure 3 As shown, the relief valve provided in this embodiment also includes an inertia container 5, which includes a screw 51, a flywheel 52 and a ball 53. The screw 51 is connected to one end of the valve core assembly 2 close to the adjustment seat 4, the flywheel 52 is axially fixedly arranged in the adjustment seat 4 and sleeved outside the screw 51, and at least part of the ball 53 is rollingly arranged between the flywheel 52 and the screw 51, and the linear motion of the screw 51 can be converted into the rotational motion of the flywheel 52 through the ball 53. Among them, the number of the ball 53 is multiple, and the specific number is not specifically limited here.

[0040] When the hydraulic pressure drives the valve core assembly 2 to move axially, the valve core assembly 2 drives the screw rod 51 to move. When the screw rod 51 moves, the multiple balls 53 rotate, and the rolling of the balls 53 drives the flywheel 52 to rotate. The screw rod 51 and the flywheel 52 are in contact through the balls 53, and there is rolling friction between the two, thereby reducing friction and reducing energy loss. When the screw rod 51 reciprocates in the axial direction, the flywheel 52 will not have a large displacement in the axial direction, and the main movement mode is rotation. When the pressure regulating spring 3 drives the valve core assembly 2 to vibrate repeatedly, the inertia force of the flywheel 52 generates a corresponding reaction force to offset the inertia force of the pressure regulating spring 3, thereby achieving the functions of vibration reduction, energy absorption, and noise reduction, and preventing the valve core assembly 2 from repeatedly hitting the valve seat 1, thereby ensuring the reliability of the pressure regulating spring 3, the valve seat 1, and the valve core assembly 2, thereby improving the reliability and service life of the entire overflow valve.

[0041] In this embodiment, the medium introduced into the overflow valve is engine oil. Engine oil has its own lubricating effect, so there is no need to disassemble the inertia container 5 and add an oil pouring hole on the valve seat 1. The engine oil can circulate inside the overflow valve, thereby achieving lubrication of the inertia container 5 and improving the service life of the structure.

[0042] Furthermore, if Figures 4 to 6 As shown, an outer spiral groove 511 is provided on the outer circumference of the screw rod 51, and an inner spiral groove 521 is provided on the inner circumference of the flywheel 52. The length of the outer spiral groove 511 along the axial direction is greater than the length of the inner spiral groove 521 along the axial direction. The inner spiral groove 521 and the outer spiral groove 511 are at least partially opposite to each other and form a spiral channel 501. A plurality of balls 53 are arranged in a rolling manner in the spiral channel 501. Specifically, the inner spiral groove 521 and the outer spiral groove 511 both have a substantially semicircular cross section. When the screw rod 51 is inserted into the flywheel 52, the inner spiral groove 521 and the corresponding portion of the outer spiral groove 511 form a spiral channel 501 with a circular cross section. In addition, a plurality of balls 53 circulate along the spiral channel 501 in a rolling motion, thereby ensuring the stability and reliability of the motion of the balls 53. Finally, the linear motion of the screw rod 51 is converted into the rotational motion of the flywheel 52, thereby reducing the friction during the rotation of the flywheel 52.

[0043] Furthermore, if Figure 3 As shown, the inertia container 5 further includes a flywheel disc 54, which is sleeved outside the screw rod 51 and fixedly connected to the adjustment seat 4. One end of the flywheel 52 close to the valve core assembly 2 is axially limited with the flywheel disc 54, and the other end of the flywheel 52 is axially limited with the adjustment seat 4. The axial ends of the flywheel 52 are limited by the flywheel disc 54 and the adjustment seat 4 respectively, ensuring that the main movement of the flywheel 52 is rotation, and no axial displacement occurs, and preventing the flywheel 52 from detaching from the screw rod 51.

[0044] In an optional embodiment, if Figure 3 and Figure 4 As shown, a circle of first outer balls 55 are arranged between one end of the flywheel 52 close to the flywheel disc 54 and the flywheel disc 54. A small gap may exist between the flywheel 52 and the flywheel disc 54. When the flywheel 52 rotates, the flywheel 52 and the flywheel disc 54 are in contact through the first outer balls 55, and the sliding friction between the two is converted into rolling friction, which reduces the friction force, reduces the energy loss, and plays a role of secondary vibration reduction.

[0045] Specifically, Figure 4 As shown, a first annular groove 522 is formed on an end surface of the flywheel 52 close to the flywheel disc 54, and a second annular groove 541 opposite to the first annular groove 522 is formed on the flywheel disc 54. The first annular groove 522 and the second annular groove 541 form a first annular raceway 502, and the first outer ball 55 is rolled in the first annular raceway 502. Specifically, the first annular groove 522 and the second annular groove 541 both have a semicircular cross section. When the flywheel 52 is matched with the flywheel disc 54, the first annular groove 522 and the second annular groove 541 form a first annular raceway 502 with a circular cross section. When the flywheel 52 rotates, the first outer ball 55 circulates along the first annular raceway 502 in a rolling motion, thereby ensuring the stability and reliability of the movement of the first outer ball 55, and converting the sliding friction between the flywheel 52 and the flywheel disc 54 into rolling friction, so as to reduce the friction force during the rotation of the flywheel 52.

[0046] In an optional embodiment, if Figure 3 and Figure 4 As shown, a circle of second outer balls 56 are arranged between the end of the flywheel 52 close to the adjustment seat 4 and the adjustment seat 4. A small gap may exist between the axial end surface of the flywheel 52 and the adjustment seat 4. When the flywheel 52 rotates, the flywheel 52 and the adjustment seat 4 are in contact through the second outer balls 56, and the sliding friction between the two is converted into rolling friction, which reduces the friction force, reduces the energy loss, and plays a role of secondary vibration reduction.

[0047] Specifically, Figure 3 and Figure 4As shown, a third annular groove 523 is provided on the end surface of the flywheel 52 close to the adjustment seat 4, and a fourth annular groove 41 opposite to the third annular groove 523 is provided on the adjustment seat 4. The third annular groove 523 and the fourth annular groove 41 form a second annular raceway 503, and the second outer ball 56 is arranged to roll in the second annular raceway 503. Specifically, the third annular groove 523 and the fourth annular groove 41 both have a semicircular cross section. When the flywheel 52 is matched with the adjustment seat 4, the third annular groove 523 and the fourth annular groove 41 form a second annular raceway 503 with a circular cross section. When the flywheel 52 rotates, the second outer ball 56 circulates along the second annular raceway 503 in a rolling motion, thereby ensuring the stability and reliability of the movement of the second outer ball 56, and converting the sliding friction between the flywheel 52 and the adjustment seat 4 into rolling friction, so as to reduce the friction force during the rotation of the flywheel 52.

[0048] Furthermore, if Figure 3 As shown, a first accommodating groove 42 is provided in the adjusting seat 4, and the inner diameter of the first accommodating groove 42 is larger than the outer diameter of the flywheel 52, so that the flywheel 52 can rotate freely, and at least part of the flywheel 52 is located in the first accommodating groove 42, so that the axial dimension of the entire overflow valve can be reduced, which is conducive to the miniaturization of the product. In this embodiment, the flywheel 52 is completely located in the first accommodating groove 42, and the fourth annular groove 41 is provided at the bottom of the first accommodating groove 42, so that the axial dimension of the entire overflow valve can be reduced. In other optional embodiments, the flywheel 52 can also be partially located in the first accommodating groove 42, which can also reduce the axial dimension of the entire overflow valve to a certain extent.

[0049] Furthermore, if Figure 3 As shown, a second accommodating groove 43 is also provided in the adjusting seat 4. The second accommodating groove 43 is located on the side of the first accommodating groove 42 close to the valve core assembly 2, and is coaxially connected to the first accommodating groove 42. The inner diameter of the second accommodating groove 43 is greater than or equal to the inner diameter of the first accommodating groove 42, and at least part of the flywheel disc 54 is located in the second accommodating groove 43. This arrangement can further reduce the axial dimension of the entire overflow valve, which is conducive to the miniaturization of the product. In this embodiment, the flywheel disc 54 is completely located in the second accommodating groove 43, so that the axial dimension of the entire overflow valve can be further reduced. In other optional embodiments, the flywheel disc 54 can also be partially located in the second accommodating groove 43, which can also reduce the axial dimension of the entire overflow valve to a certain extent.

[0050] Optionally, the flywheel disc 54 can be fixed in the second receiving groove 43 by threaded connection, snap-fit ​​or interference fit. In this embodiment, since the outer diameter of the flywheel disc 54 is greater than the outer diameter of the flywheel 52, the inner diameter of the second receiving groove 43 is greater than the inner diameter of the first receiving groove 42. In other optional embodiments, when the outer diameter of the flywheel disc 54 is equal to the outer diameter of the flywheel 52, the inner diameter of the second receiving groove 43 can also be equal to the inner diameter of the first receiving groove 42, which is not specifically limited here.

[0051] Furthermore, if Figure 3 As shown, a through groove 45 is further formed at the bottom of the first accommodating groove 42 , and the inner diameter of the through groove 45 matches the outer diameter of the screw rod 51 , so that the screw rod 51 can move freely into the through groove 45 to avoid affecting the movement of the screw rod 51 .

[0052] like Figure 2 As shown, the valve core assembly 2 includes a valve core body 21 and a connecting rod 22. The valve core body 21 is used to achieve the connection or cutoff between the oil inlet 11 and the oil return port 12. One end of the connecting rod 22 is connected to the valve core body 21, and the other end of the connecting rod 22 is connected to the screw 51. The hydraulic force and the elastic force of the pressure regulating spring 3 act on the valve core body 21, driving the valve core body 21 to move axially. When the valve core body 21 moves axially, the valve core body 21 drives the connecting rod 22 to move, and the connecting rod 22 drives the screw 51 to move. The connecting rod 22 and the valve core body 21 are processed separately and then connected to form a whole, which facilitates the processing of the connecting rod 22 and the valve core body 21. Optionally, the connecting rod 22 and the valve core body 21 and the connecting rod 22 and the screw 51 can be detachably connected by threaded connection, clamping, etc., which is not specifically limited here.

[0053] Specifically, Figure 2 As shown, the valve seat 1 is provided with an abutment portion 13, which is a right-angle structure, and a conical sealing surface 211 is formed on the valve core body 21. When the conical sealing surface 211 abuts against the abutment portion 13, the oil inlet 11 and the oil return port 12 are disconnected, and the seal between the conical sealing surface 211 and the abutment portion 13 is a line contact seal formed by the annular line and the conical surface, and the sealing effect is good.

[0054] Furthermore, if Figure 2 As shown, the valve core assembly 2 also includes a spring seat 23, which is fixedly mounted on the outside of the valve core body 21. The end of the adjustment seat 4 close to the pressure regulating spring 3 is provided with a receiving cavity 44, one end of the pressure regulating spring 3 abuts against the spring seat 23, and the other end of the pressure regulating spring 3 extends into the receiving cavity 44 and abuts against the bottom of the receiving cavity 44. Figure 3As shown, along the axial direction of the adjustment seat 4, the accommodating cavity 44, the second accommodating groove 43, the first accommodating groove 42 and the penetration groove 45 are sequentially connected and form a stepped hole with a decreasing inner diameter. The elastic force of the pressure regulating spring 3 can act on the valve core body 21 through the spring seat 23, and a part of the pressure regulating spring 3 is located in the accommodating cavity 44, so that the axial size of the overflow valve can be further reduced, which is conducive to the miniaturization of the product.

[0055] Furthermore, if Figure 1 and Figure 2 As shown, the regulating seat 4 includes an end cover 46, an anti-dropping member 47 and a sealing member 48. At least part of the inertia container 5 is located in the end cover 46, and at least part of the end cover 46 is located in the valve seat 1. The sealing member 48 is sleeved outside the end cover 46, and along the radial direction of the valve seat 1, one side of the sealing member 48 abuts against the valve seat 1, and the other side of the sealing member 48 abuts against the end cover 46, so as to achieve a good sealing effect. Among them, the sealing member 48 can be selected as an O-ring. Figure 3 As shown, the aforementioned accommodating cavity 44 , the second accommodating groove 43 , the first accommodating groove 42 and the penetration groove 45 are all opened in the end cover 46 .

[0056] At least part of the anti-slip component 47 is located between the end cover 46 and the valve seat 1. The outer ring of the anti-slip component 47 and the valve seat 1 can be optionally connected by threaded connection, interference fit or by a wire retaining ring. The inner ring of the anti-slip component 47 is threadedly connected to the end cover 46 to achieve adjustable axial position of the end cover 46, which is convenient for adjusting the depth of the end cover 46 screwed into the valve seat 1 to change the length of the pressure regulating spring 3, thereby changing the starting pressure of the relief valve.

[0057] Furthermore, if Figure 1 and Figure 2 As shown, the adjustment seat 4 further includes a nut 49, which is threadedly mounted on the anti-slipping member 47 and abuts against the outer end of the anti-slipping member 47 to further prevent loosening.

[0058] 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. A relief valve, comprising a valve seat (1) and a valve core assembly (2), wherein the valve seat (1) is provided with an oil inlet (11) and an oil return port (12), the valve core assembly (2) is slidably arranged in the valve seat (1) to adjust the connection state between the oil inlet (11) and the oil return port (12), an adjusting seat (4) is installed at one end of the valve seat (1), a pressure regulating spring (3) is arranged on the outer sleeve of the valve core assembly (2), one end of the pressure regulating spring (3) abuts against the valve core assembly (2), and the other end abuts against the adjusting seat (4), characterized in that: The invention also comprises an inertia container (5), wherein the inertia container (5) comprises a screw rod (51), a flywheel (52) and a ball (53), wherein the screw rod (51) is connected to one end of the valve core assembly (2) close to the adjustment seat (4), the flywheel (52) is sleeved outside the screw rod (51), and at least a part of the ball (53) is rollingly arranged between the flywheel (52) and the screw rod (51), and the linear motion of the screw rod (51) can be converted into the rotational motion of the flywheel (52) through the ball (53).

2. The relief valve according to claim 1, characterized in that: An outer spiral groove (511) is provided on the outer circumferential surface of the screw rod (51), and an inner spiral groove (521) is provided on the inner circumferential surface of the flywheel (52). The inner spiral groove (521) and the outer spiral groove (511) are at least partially opposite to each other and form a spiral channel (501). The ball (53) is rollingly arranged in the spiral channel (501).

3. The relief valve according to claim 1, characterized in that: The inertia container (5) further comprises a flywheel disc (54), which is sleeved outside the screw rod (51) and fixedly connected to the adjustment seat (4); one end of the flywheel (52) close to the valve core assembly (2) is axially limitedly matched with the flywheel disc (54), and the other end of the flywheel (52) is axially limitedly matched with the adjustment seat (4).

4. The relief valve according to claim 3, characterized in that: A first outer ball (55) is provided between one end of the flywheel (52) close to the flywheel disc (54) and the flywheel disc (54) for rolling; And / or, a second outer ball (56) is provided rollingly between one end of the flywheel (52) close to the adjustment seat (4) and the adjustment seat (4).

5. The relief valve according to claim 4, characterized in that: A first annular groove (522) is formed on an end surface of the flywheel (52) close to the flywheel disc (54); a second annular groove (541) opposite to the first annular groove (522) is formed on the flywheel disc (54); the first annular groove (522) and the second annular groove (541) form a first annular raceway (502); and the first outer ball (55) is rollingly arranged in the first annular raceway (502); And / or, a third annular groove (523) is provided on an end surface of the flywheel (52) close to the adjustment seat (4), a fourth annular groove (41) opposite to the third annular groove (523) is provided on the adjustment seat (4), the third annular groove (523) and the fourth annular groove (41) form a second annular raceway (503), and the second outer ball (56) is rollingly arranged in the second annular raceway (503).

6. The relief valve according to claim 3, characterized in that: A first accommodating groove (42) is provided in the adjustment seat (4), the inner diameter of the first accommodating groove (42) is larger than the outer diameter of the flywheel (52), and at least a portion of the flywheel (52) is located in the first accommodating groove (42).

7. The relief valve according to claim 6, characterized in that: A second accommodating groove (43) is also provided in the adjustment seat (4). The second accommodating groove (43) is located on a side of the first accommodating groove (42) close to the valve core assembly (2) and is coaxially connected to the first accommodating groove (42). The inner diameter of the second accommodating groove (43) is greater than or equal to the inner diameter of the first accommodating groove (42). At least a portion of the flywheel disc (54) is located in the second accommodating groove (43).

8. The relief valve according to any one of claims 1 to 7, characterized in that: The valve core assembly (2) comprises a valve core body (21) and a connecting rod (22); the valve core body (21) is used to achieve communication or disconnection between the oil inlet (11) and the oil return port (12); one end of the connecting rod (22) is connected to the valve core body (21), and the other end of the connecting rod (22) is connected to the screw rod (51).

9. The relief valve according to claim 8, characterized in that: The valve core assembly (2) further comprises a spring seat (23), wherein the spring seat (23) is mounted on the outside of the valve core body (21), and an accommodating cavity (44) is provided at one end of the adjusting seat (4) close to the pressure regulating spring (3), one end of the pressure regulating spring (3) abuts against the spring seat (23), and the other end of the pressure regulating spring (3) extends into the accommodating cavity (44) and abuts against the bottom of the accommodating cavity (44).

10. The relief valve according to any one of claims 1 to 7, characterized in that: The adjustment seat (4) comprises an end cover (46), an anti-slip component (47) and a sealing component (48); at least a portion of the inertial container (5) is located in the end cover (46); at least a portion of the end cover (46) is located in the valve seat (1); the sealing component (48) is sleeved outside the end cover (46), and along the radial direction of the valve seat (1), one side of the sealing component (48) abuts against the valve seat (1), and the other side of the sealing component (48) abuts against the end cover (46); at least a portion of the anti-slip component (47) is located between the end cover (46) and the valve seat (1); the anti-slip component (47) is connected to the valve seat (1); and the anti-slip component (47) is threadedly connected to the end cover (46) to achieve adjustable axial position of the end cover (46).

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