An overflow valve

Abstract

The application relates to the technical field of valve bodies, and discloses an overflow valve which comprises a main valve seat, a valve sleeve, a valve core, a pressure relief assembly and a sealing piece, the main valve seat comprises a main valve cavity; the valve sleeve is installed at one end of the main valve seat, the valve sleeve comprises a valve sleeve cavity and an oil outlet hole, the valve sleeve cavity penetrates through the valve sleeve along the axial direction of the main valve cavity, the valve sleeve cavity comprises an oil inlet, a connecting port and a sealing part, the sealing part is located between the oil outlet hole and the oil inlet, the connecting port extends into the main valve cavity and communicates with the main valve cavity; the valve core is slidably installed in the valve sleeve cavity, so that the valve core has a closed state of disconnecting the oil outlet hole and the oil inlet and an open state of connecting the oil outlet hole and the oil inlet; the pressure relief assembly is installed at the other end of the main valve seat, and the pressure relief assembly comprises a pressure relief cavity; and the sealing piece is installed between the valve core and the valve sleeve. The gap between the valve core and the valve sleeve is sealed by the sealing piece, the sealing performance of the overflow valve is improved, the size precision requirement of the valve core and the valve sleeve is reduced, and the production cost of the overflow valve is reduced.

Description

Technical Field

[0001] This application relates to the field of valve body technology, and more particularly to an overflow valve. Background Technology

[0002] The relief valve consists of a valve sleeve and a valve core. By moving the valve core relative to the valve sleeve, the oil inlet and outlet on the valve sleeve are connected or disconnected, thereby controlling the opening and closing of the relief valve.

[0003] However, the valve core and valve sleeve are not sealed together, which results in a certain gap between them. When the relief valve is activated (the valve core moves relative to the valve sleeve), some oil will leak through this gap. At the same time, in order to improve the sealing performance between the valve core and valve sleeve as much as possible, the dimensional accuracy requirements of the valve core and valve sleeve are high, which increases the production cost of the relief valve. Utility Model Content

[0004] This application provides a relief valve that improves the sealing performance of the relief valve while reducing the production cost of the relief valve.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, embodiments of this application provide an overflow valve, including a main valve seat, a valve sleeve, a valve core, a pressure relief assembly, and a seal. The main valve seat includes a main valve cavity penetrating the main valve seat. The valve sleeve is installed at one end of the main valve seat and includes a valve sleeve cavity and an oil outlet. The valve sleeve cavity penetrates the valve sleeve and extends along the axial direction of the main valve cavity. The valve sleeve cavity includes an oil inlet, a connection port, and a sealing portion. The sealing portion is located between the oil outlet and the oil inlet. The connection port extends into the main valve cavity and communicates with the main valve cavity. The valve core is installed in the valve sleeve cavity and has a degree of freedom of movement along the valve sleeve cavity, such that the valve core has a closed state that disconnects the oil outlet and the oil inlet and an open state that connects the oil outlet and the oil inlet. The pressure relief assembly is installed at the other end of the main valve seat and includes a pressure relief cavity. The seal is installed between the valve core and the valve sleeve.

[0006] As one implementation, a sealing groove is formed in the valve core along its circumference, and a seal is installed in the sealing groove, with the seal at least partially abutting against the inner wall of the valve sleeve cavity.

[0007] As one implementation method, the valve core also has multiple parallel pressure equalization grooves along its circumference; along the valve core's axial direction, the multiple pressure equalization grooves are located on both sides of the sealing groove.

[0008] As one implementation method, the valve sleeve cavity includes a sealing section, with an oil inlet and an oil outlet respectively connected to the sealing section; the sealing part is located inside the sealing section; when the valve core is in the closed state, the pressure equalization groove facing the oil inlet is misaligned with the sealing section.

[0009] In one implementation, the valve core includes a damping orifice and a connecting channel that are interconnected. The damping orifice is located at the end of the valve core facing the oil inlet, and the damping orifice is connected to the pressure relief chamber through the connecting channel.

[0010] As one implementation, the pressure relief assembly includes a pressure relief regulating element and a pressure relief seat. The pressure relief seat is at least partially installed in the valve sleeve cavity and seals the end of the valve sleeve cavity away from the oil inlet. The pressure relief cavity is located between the pressure relief seat and the pressure relief regulating element. The pressure relief seat includes a pressure relief hole, and the valve sleeve cavity communicates with the pressure relief cavity through the pressure relief hole. The hydraulic hole is opened or closed by the pressure relief regulating element.

[0011] As one implementation, the relief valve also includes a first spring, which abuts against the pressure relief seat and the valve core respectively, and the first spring provides a first spring force to the valve core toward the oil inlet.

[0012] As one implementation, the pressure relief regulating component includes a conical valve core located on the side of the pressure relief seat away from the valve core, and the conical valve core at least partially extending into the pressure relief orifice; the conical valve core has a degree of freedom of movement that moves along the valve core axis to change the opening and closing of the pressure relief orifice.

[0013] As one implementation, the pressure relief regulating component includes a pressure relief valve seat, a second spring, and an adjusting seat. The pressure relief valve seat extends at least partially into the main valve chamber, and a pilot chamber is formed between the pressure relief valve seat and the main valve chamber. A pilot hole is formed on the main valve seat, and the pilot hole communicates with the pilot chamber. An adjusting channel is formed inside the pressure relief valve seat, and the adjusting seat is installed in the adjusting channel, and the adjusting seat has the degree of freedom to move along the adjusting channel. The two ends of the second spring abut against the cone valve core and the adjusting seat, respectively.

[0014] As one implementation, the pressure relief regulating component also includes an adjusting rod and an abutment block. The adjusting rod is located at the end of the pressure relief valve seat away from the cone valve core, and the adjusting rod is installed in the regulating channel by threads. The adjusting rod abuts against the regulating seat through the abutment block.

[0015] By sealing the gap between the valve core and the valve sleeve with a sealing element, the sealing performance of the relief valve is improved, and the dimensional accuracy requirements of the valve core and valve sleeve can be reduced, thereby reducing the production cost of the relief valve. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the relief valve provided in this application.

[0018] Figure 2 yes Figure 1 A magnified view of part A of the relief valve shown.

[0019] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the valve sleeve of the relief valve.

[0020] Figure 4 yes Figure 3 A cross-sectional view of another implementation of the valve sleeve shown.

[0021] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the valve core of the relief valve.

[0022] Figure 6 yes Figure 3 The diagram shows the structure of the valve sleeve of the relief valve.

[0023] Figure 7 yes Figure 1 The diagram shows the structure of the main valve seat of the relief valve.

[0024] Explanation of reference numerals in the attached drawings: Main valve seat 1, main valve chamber 101, mounting step 1011, fluid passage 1012, pressure relief channel 1013, pilot hole 102, valve sleeve 2, valve sleeve cavity 201, oil inlet 2011, connection port 2012, sealing part 2013, sealing section 2014, first hole section 2015, second hole section 2016, third hole section 2017, oil outlet 202, mounting ring 203, notch 2031, valve core 3, sealing groove 301, pressure equalization. 302 groove, 303 damping hole, 304 connecting channel, 4 pressure relief assembly, 401 pressure relief chamber, 402 pressure relief seat, 4021 pressure relief hole, 403 pressure relief adjusting component, 4031 cone valve core, 4032 pressure relief valve seat, 40321 adjusting channel, 4033 second spring, 4034 adjusting seat, 40341 ​​adjusting hole, 4035 adjusting rod, 4036 abutment block, 404 pilot chamber, 5 sealing component, 6 first spring, 601 limiting block, 7 filter. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] like Figure 1 and Figure 2As shown, in one implementation, this application provides a relief valve, including a main valve seat 1, a valve sleeve 2, a valve core 3, a pressure relief assembly 4, and a sealing element 5. At least a portion of the valve sleeve 2 and at least a portion of the pressure relief assembly 4 are installed in the main valve seat 1, the valve core 3 is installed in the valve sleeve 2, and the sealing element 5 is installed between the valve core 3 and the valve sleeve 2 to seal the gap between the valve core 3 and the valve sleeve 2, thereby improving the sealing performance between the valve core 3 and the valve sleeve 2, and thus improving the sealing performance of the relief valve. Furthermore, by providing the sealing element 5, the dimensional accuracy requirements of the valve core 3 and the valve sleeve 2 can be reduced, thereby reducing the production cost of the relief valve.

[0027] Specifically, the main valve seat 1 includes a main valve cavity 101 that extends through the main valve seat 1.

[0028] Along the axial direction of the main valve chamber 101, the valve sleeve 2 is installed at one end of the main valve seat 1.

[0029] The valve sleeve 2 includes a valve sleeve cavity 201 and an oil outlet 202. The valve sleeve cavity 201 extends through the valve sleeve 2 along the axial direction of the main valve cavity 101. The valve sleeve cavity 201 includes an oil inlet 2011, a connection port 2012, and a sealing part 2013. The sealing part 2013 is located between the oil inlet 2011 and the connection port 2012. The valve sleeve 2 is at least partially installed in the main valve cavity 101, such that the connection port 2012 extends into the main valve cavity 101 and communicates with the main valve cavity 101.

[0030] The valve core 3 is installed in the valve sleeve cavity 201, and the valve core 3 has the freedom of movement to move along the valve sleeve cavity 201, so that the valve core 3 has a closed state that disconnects the oil outlet 202 and the oil inlet 2011 and an open state that connects the oil outlet 202 and the oil inlet 2011.

[0031] When the valve core 3 is in the closed state, the valve core 3 abuts against the sealing part 2013, so that the valve core 3 and the sealing part 2013 are sealed, thereby disconnecting the oil outlet 202 and the oil inlet 2011.

[0032] When the valve core 3 is in the open state, the valve core 3 is separated from the sealing part 2013, so that the oil outlet 202 and the oil inlet 2011 are connected.

[0033] The pressure relief assembly 4 is installed at the other end of the main valve seat 1 to close the other end of the valve seat 1. The pressure relief assembly 4 includes a pressure relief chamber 401, which is used to allow the oil in the relief valve to flow to the outside of the relief valve, ensuring that the valve core 3 can move relative to the valve sleeve 2.

[0034] To more clearly illustrate the technical solution of this application, the following definitions are provided. Figure 1 The left and right directions are shown. The axial direction along the main valve chamber 101 is... Figure 1 The left and right directions in the middle.

[0035] like Figure 3 As shown, in one implementation, the valve sleeve cavity 201 is a multi-segment stepped bore. Along the axial direction of the main valve cavity 101, the valve sleeve cavity 201 sequentially includes a first bore segment 2015, a sealing segment 2014, a second bore segment 2016, and a third bore segment 2017. The oil inlet 2012 is formed in the first bore segment 2015, and the sealing part 2013 is located in the sealing segment 2014 and is connected to the first bore segment 2015.

[0036] An oil outlet 202 is formed on the side wall of the valve sleeve 2, and the oil outlet 202 is connected to the sealing section 2014, so that the oil outlet 202 and the oil inlet 2012 are located on both sides of the sealing part 2013 respectively.

[0037] The valve core 3 slides within the sealing section 2014, the second orifice section 2016, and the third orifice section 2017, thereby realizing the opening and closing of the relief valve.

[0038] like Figure 2 As shown, in one implementation, a sealing groove 301 is formed in the valve core 3 along the circumference of the valve core 3, and the sealing element 5 is installed in the sealing groove 301, and the sealing element 5 at least partially abuts against the inner wall of the valve sleeve cavity 201.

[0039] The sealing element 5 is installed through the sealing groove 301, which facilitates the movement of the sealing element 5 with the valve core 3, thereby improving the sliding sealing performance between the valve core 3 and the valve sleeve 2.

[0040] It should be noted that the sealing groove 301 is an annular groove structure along the circumferential sidewall of the valve core 3. For example... Figure 4 As shown, as another implementation, along the circumference of the valve sleeve cavity 201, a sealing groove 301 is formed on the inner wall of the second hole section 2016 of the valve sleeve cavity 201. The sealing element 5 is installed in the sealing groove 301 of the valve sleeve cavity 201. During the movement of the valve core 3, the valve core 3 slides relative to the sealing element 5, thereby improving the sliding sealing performance between the valve core 3 and the valve sleeve 2.

[0041] Specifically, the sealing groove 301 is located on the inner wall of the second hole section 2016 or the inner wall of the third hole section 2017.

[0042] Optionally, along the axial direction of the valve sleeve 2, from the direction of the valve sleeve 2 near the oil inlet 2011 to the direction of the direction away from the oil inlet 2011, the sealing groove 301 is located at 1 / 2-2 / 3 of the valve sleeve 2.

[0043] Furthermore, the distance between the sealing groove 301 and the end of the valve sleeve 2 near the oil inlet 2011 is 10mm to 17mm, ensuring that the sealing element 5 can still seal the valve core 3 and the valve sleeve 2 after the valve sleeve 2 moves to overflow.

[0044] In this implementation, the opening depth of the sealing groove 301 along the radial direction of the valve sleeve cavity 201 is L1, and the distance between the annular surface of the sealing groove 301 away from the axis of the valve sleeve cavity 201 and the outer wall of the valve sleeve 2 on the same radial direction of the sealing groove 301 is L2, where L1 is less than or equal to L2.

[0045] Furthermore, the ratio of L1 to L2 is between 0.67 and 1.

[0046] By setting the above, the ratio of L1 to L2 is avoided from being too large, the depth of the sealing groove 301 is prevented from being too large, and the valve sleeve 2 is guaranteed to have good overall compressive strength and service life.

[0047] By setting the above, the ratio of L1 to L2 is avoided from being too small, ensuring that the sealing groove 301 can stably install the sealing element 5.

[0048] Specifically, L2 is taken as 1.5mm to 2mm.

[0049] It should be noted that in the relief valve of this application, a sealing groove 301 can be provided on the outer wall of the valve core 3, or on the inner wall of the valve sleeve 2, or both the outer wall of the valve core 3 and the inner wall of the valve sleeve 2 can be provided with sealing grooves 301. This application describes the structure with the seal 5 installed on the valve core 3.

[0050] As one implementation method, the valve core 3 also has multiple parallel pressure equalization grooves 302 along its circumference. The pressure equalization grooves 302 balance the radial pressure on the valve core 3, preventing the valve core 3 from jamming with the valve sleeve 2. At the same time, the pressure equalization grooves 302 can further improve the sealing performance between the valve core 3 and the valve sleeve 2.

[0051] Specifically, along the axial direction of the valve core 3, multiple pressure equalization grooves 302 are located on both sides of the sealing groove 301, that is, multiple pressure equalization grooves 302 are provided on both sides of the sealing groove 301 to ensure the consistency of the valve core on both sides of the sealing element 5.

[0052] As one implementation, when the valve core 3 is in the closed state, the pressure equalization groove 302 facing the oil inlet 2011 is misaligned with the sealing section 2014. That is, when the valve core 3 is in the closed state, the pressure equalization groove 302 is located in the second hole section 2016, preventing the oil in the sealing section 2014 from flowing directly into the pressure equalization groove 302, and further improving the sealing performance between the valve core 3 and the valve sleeve 2.

[0053] In one implementation, the valve core 3 includes a damping hole 303 and a connecting channel 304 that are interconnected. The damping hole 303 is located at the end of the valve core 3 facing the oil inlet 2011, and the damping hole 303 is connected to the pressure relief chamber 401 through the connecting channel 304.

[0054] like Figure 5As shown, in one implementation, the opening depth of the sealing groove 301 along the radial direction of the valve core 3 is L3, and the minimum distance between the annular surface of the sealing groove 301 away from the inner wall of the valve sleeve 2 and the inner wall of the connecting channel 304 is L4, where L3 is less than or equal to L4.

[0055] Furthermore, the ratio of L3 to L4 is 0.67 to 1.

[0056] By setting the above, the ratio of L3 to L4 is avoided from being too large, the depth of the sealing groove 301 is prevented from being too large, and the valve core 3 is guaranteed to have good overall pressure resistance and service life.

[0057] By setting the above, the ratio of L3 to L4 is avoided from being too small, ensuring that the sealing groove 301 can stably install the sealing element 5. When the oil pressure at the oil inlet 2012 increases, the oil can overflow through the damping hole 303 to the side of the valve core 3 away from the oil inlet 2012.

[0058] It should be noted that in some other implementations, the damping orifice 303 can be located at the end of the valve core 3 opposite to the oil inlet 2011.

[0059] like Figure 1 As shown, in one implementation, the pressure relief assembly 4 includes a pressure relief regulating element 403 and a pressure relief seat 402. The pressure relief seat 402 is at least partially installed in the valve sleeve cavity 201 and seals the end of the valve sleeve cavity 201 away from the oil inlet 2011.

[0060] The pressure relief seat 402 includes a pressure relief hole 4021, and the valve sleeve cavity 201 is connected to the pressure relief cavity 401 through the pressure relief hole 4021.

[0061] When the valve core 3 moves relative to the valve sleeve 2, the valve sleeve cavity 201 can flow into the pressure relief cavity 401 through the pressure relief hole 4021, thereby opening the relief valve.

[0062] When the oil pressure at the oil inlet 2012 increases, the oil can overflow into the pressure relief chamber 401 through the damping hole 303 and the pressure relief hole 4021 in sequence, thereby realizing the overflow of the overflow valve.

[0063] The pressure relief regulating component 403 is at least partially installed in the main valve chamber 101, and the pressure relief chamber 401 is located between the pressure relief seat 402 and the pressure relief regulating component 403.

[0064] Specifically, an installation step 1011 is formed in the main valve chamber 101, and the end of the pressure relief seat 402 away from the valve core 3 abuts against the installation step 1011. The pressure relief seat 402 and the valve sleeve 2 are positioned and installed by the installation step 1011.

[0065] like Figure 2 , Figure 6 and Figure 7As shown, there is a certain annular gap between the inner wall of the main valve chamber 101 and the outer wall of the valve sleeve 2, forming a pressure relief channel 1013. A fluid passage 1012 is formed in the main valve chamber 101. The pressure relief chamber 401 is connected to the pressure relief channel 1013 through the fluid passage 1012, so that the oil in the pressure relief chamber 401 flows through the fluid passage 1012 and the pressure relief channel 1013 in sequence and then flows to the outside of the overflow valve.

[0066] More specifically, an installation ring 203 is formed on the outer wall of the valve sleeve 2, and the valve sleeve 2 is installed in the main valve chamber 101 through the installation ring 203. A notch 2031 is formed on the installation ring 203, and the liquid passage 1012 is connected to the pressure relief passage 1013 through the notch 2031.

[0067] As one implementation, the relief valve also includes a first spring 6, which abuts against the pressure relief seat 402 and the valve core 3 respectively.

[0068] The first spring 6 provides a first spring force to the valve core 3 toward the oil inlet 2011, causing the valve core 3 to abut against the sealing part 2013, so that the relief valve is normally in the closed state.

[0069] Specifically, a limiting block 601 is installed at the end of the first spring 6 facing the pressure relief seat 402. The limiting block 601 is installed in the shaft hole of the pressure relief seat 402 to improve the installation stability of the first spring 6.

[0070] Furthermore, a filter 7 is installed between the end face of the limiting block 601 facing the pressure relief seat 402 and the end face of the shaft hole of the pressure relief seat 402, so that the oil flowing from the valve sleeve cavity 201 to the pressure relief cavity 401 is filtered through the filter 7.

[0071] like Figure 2 As shown, in one implementation, the pressure relief regulating component 403 includes a cone valve core 4031, which is located on the side of the pressure relief seat 402 away from the valve core 3, and the cone valve core 4031 extends at least partially into the pressure relief hole 4021.

[0072] The cone valve core 4031 has a degree of freedom to move along the axial direction of the valve core 3, so as to change the opening and closing of the pressure relief hole 4021, so that when the pressure of the oil inlet 2011 reaches a certain value, the pressure relief hole 4021 opens, realizing the overflow valve to relieve pressure.

[0073] like Figure 2 As shown, in one implementation, the pressure relief regulating component 403 includes a pressure relief valve seat 4032, a second spring 4033, and an adjusting seat 4034. The pressure relief valve seat 4032 is at least partially installed in the main valve seat 1. The second spring 4033 and the adjusting seat 4034 are installed in the pressure relief valve seat 4032, and the two ends of the second spring 4033 abut against the cone valve core 4031 and the adjusting seat 4034, respectively.

[0074] The second spring 4033 provides a second spring force to the cone valve core 4031 toward the oil inlet 2011, causing the cone valve core 4031 to close the pressure relief port 4021.

[0075] Specifically, an adjustment channel 40321 is formed in the pressure relief valve seat 4032, and an adjustment seat 4034 is installed in the adjustment channel 40321. The adjustment seat 4034 has the freedom of movement to move along the adjustment channel 40321. By moving the adjustment seat 4034, the second spring force of the second spring 4033 on the cone valve core 4031 is changed, thereby changing the oil pressure required to open the pressure relief hole 4021, and thus changing the overflow pressure of this relief valve.

[0076] Furthermore, the pressure relief valve seat 4032 extends at least partially into the main valve chamber 101, and a pilot chamber 404 is formed between the pressure relief valve seat 4032 and the main valve chamber 101. A pilot hole 102 is formed on the main valve seat 1, and the pilot hole 102 communicates with the pilot chamber 404.

[0077] Meanwhile, an adjustment hole 40341 ​​is formed on the adjustment seat 4034, and the two ends of the adjustment hole 40341 ​​are respectively connected to the pilot cavity 404 and the end of the adjustment seat 4034 away from the cone valve core 4031.

[0078] By changing the oil pressure at the pilot hole 102, the oil pressure at the end of the regulating seat 4034 away from the cone valve core 4031 is changed, thereby changing the compression of the second spring 4033, and thus changing the opening pressure of the pressure relief hole 4021, the overflow pressure of this relief valve is changed.

[0079] like Figure 2 As shown, in one implementation, the pressure relief regulating component 403 also includes an adjusting rod 4035 and an abutment block 4036. The adjusting rod 4035 is located at the end of the pressure relief valve seat 4032 away from the cone valve core 4031, and the adjusting rod 4035 is threadedly installed in the adjusting channel 40321. The adjusting rod 4035 abuts against the adjusting seat 4034 through the abutment block 4036.

[0080] The compression of the second spring 4033 can be manually adjusted by rotating the adjusting rod 4035 to adjust the relative position of the adjusting seat 4034.

[0081] The working principle of this relief valve is as follows: Under normal conditions, the overflow valve is closed, and the oil outlet 202 and oil inlet 2011 are disconnected. At this time, when the oil pressure at the oil inlet 2011 increases, the oil flows through the damping hole 303 into the valve sleeve cavity 201. When the oil pressure in the valve sleeve cavity 201 is greater than the second spring force, the cone valve core 4031 separates from the pressure relief hole 4021, the pressure relief hole 4021 opens, and the oil in the valve sleeve cavity 201 flows sequentially through the pressure relief cavity 401, the liquid passage 1012, and the pressure relief channel 1013 before flowing out of the overflow valve.

[0082] When the oil pressure in the pressure relief chamber 401 decreases, the oil pressure at the oil inlet 2011 pushes the valve core 3 to the left, so that the oil outlet 202 and the oil inlet 2011 are connected, and the oil at the oil inlet 2011 flows directly to the outside of the overflow valve through the oil outlet 202.

[0083] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0084] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An overflow valve, characterized in that, include: The main valve seat (1) includes a main valve cavity (101) that extends through the main valve seat (1). A valve sleeve (2) is installed at one end of the main valve seat (1). The valve sleeve (2) includes a valve sleeve cavity (201) and an oil outlet (202). The valve sleeve cavity (201) penetrates the valve sleeve (2) along the axial direction of the main valve cavity (101). The valve sleeve cavity (201) includes an oil inlet (2011), a connecting port (2012), and a sealing part (2013). The sealing part (2013) is located between the oil outlet (202) and the oil inlet (2011). The connecting port (2012) extends into the main valve cavity (101) and communicates with the main valve cavity (101). The valve core (3) is installed in the valve sleeve cavity (201) and has a degree of freedom of movement along the valve sleeve cavity (201), so that the valve core (3) has a closed state that disconnects the oil outlet (202) and the oil inlet (2011) and an open state that connects the oil outlet (202) and the oil inlet (2011); Pressure relief assembly (4), which is installed at the other end of the main valve seat (1), includes a pressure relief chamber (401). A sealing element (5) is installed between the valve core (3) and the valve sleeve (2).

2. The overflow valve according to claim 1, characterized in that, Along the circumference of the valve core (3), the valve core (3) has a sealing groove (301), the sealing element (5) is installed in the sealing groove (301), and the sealing element (5) at least partially abuts against the inner wall of the valve sleeve cavity (201).

3. The overflow valve according to claim 2, characterized in that, Along the circumference of the valve core (3), the valve core (3) also has a plurality of mutually parallel pressure equalization grooves (302). Along the axial direction of the valve core (3), a plurality of pressure equalization grooves (302) are located on both sides of the sealing groove (301).

4. The overflow valve according to claim 3, characterized in that, The valve sleeve cavity (201) includes a sealing section (2014), and the oil inlet (2011) and the oil outlet (202) are respectively connected to the sealing section (2014); The sealing part (2013) is located within the sealing section (2014); When the valve core (3) is in the closed state, the pressure equalization groove (302) located towards the oil inlet (2011) is misaligned with the sealing section (2014).

5. A relief valve according to claim 1, characterized in that, The valve core (3) includes a damping hole (303) and a connecting channel (304) that are interconnected. The damping hole (303) is located at the end of the valve core (3) facing the oil inlet (2011), and the damping hole (303) is connected to the pressure relief chamber (401) through the connecting channel (304).

6. A relief valve according to claim 1, characterized in that, The pressure relief assembly (4) includes a pressure relief adjusting member (403) and a pressure relief seat (402). The pressure relief seat (402) is at least partially installed in the valve sleeve cavity (201) and seals the end of the valve sleeve cavity (201) away from the oil inlet (2011). The pressure relief cavity (401) is located between the pressure relief seat (402) and the pressure relief adjusting member (403). The pressure relief seat (402) includes a pressure relief hole (4021), and the valve sleeve cavity (201) is connected to the pressure relief cavity (401) through the pressure relief hole (4021). The pressure relief hole (4021) is opened or closed by the pressure relief adjusting component (403).

7. A relief valve according to claim 6, characterized in that, The overflow valve also includes a first spring (6), which abuts against the pressure relief seat (402) and the valve core (3) respectively, and the first spring (6) provides a first spring force to the valve core (3) toward the oil inlet (2011).

8. A relief valve according to claim 6, characterized in that, The pressure relief regulating component (403) includes a cone valve core (4031), which is located on the side of the pressure relief seat (402) away from the valve core (3), and the cone valve core (4031) extends at least partially into the pressure relief hole (4021); The cone valve core (4031) has a degree of freedom of movement along the axial direction of the valve core (3) to change the on / off state of the pressure relief hole (4021).

9. A relief valve according to claim 8, characterized in that, The pressure relief regulating component (403) includes a pressure relief valve seat (4032), a second spring (4033), and an adjusting seat (4034). The pressure relief valve seat (4032) extends at least partially into the main valve chamber (101), and a pilot chamber (404) is formed between the pressure relief valve seat (4032) and the main valve chamber (101). A pilot hole (102) is formed on the main valve seat (1), and the pilot hole (102) communicates with the pilot cavity (404); An adjustment channel (40321) is formed in the pressure relief valve seat (4032), the adjustment seat (4034) is installed in the adjustment channel (40321), and the adjustment seat (4034) has a degree of freedom of movement to move along the adjustment channel (40321); The two ends of the second spring (4033) abut against the cone valve core (4031) and the adjusting seat (4034), respectively.

10. A relief valve according to claim 9, characterized in that, The pressure relief regulating component (403) further includes an adjusting rod (4035) and an abutment block (4036). The adjusting rod (4035) is located at the end of the pressure relief valve seat (4032) away from the cone valve core (4031), and the adjusting rod (4035) is threaded into the regulating channel (40321). The adjusting rod (4035) abuts against the regulating seat (4034) through the abutment block (4036).

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