Overflow valve and hydraulic system
By setting a damping structure and adjusting components near the oil inlet in the relief valve, the opening oil pressure of the relief valve can be precisely adjusted, solving the problems of large oil pressure loss and low accuracy in the prior art, and realizing high-precision control of the relief valve.
Patent Information
- Application Number
- CN202423283191.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The damping structure of the relief valve for the travel motor of existing small tracked excavators is complex, resulting in large oil pressure loss and affecting the accuracy of the relief valve opening threshold.
An overflow valve is designed, including a main valve sleeve, an adjusting component, a valve core assembly, and an elastic element. The damping structure of the valve core assembly is located close to the oil inlet. The opening oil pressure of the overflow valve is precisely adjusted by the adjusting component, reducing oil pressure loss and improving accuracy.
This reduces oil pressure loss and improves accuracy of the relief valve, enabling precise control within ±3 bar without altering the manufacturing process, and reducing the impact when the travel motor stops.
Smart Images
Figure CN223524103U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of hydraulic valve especially relates to an overflow valve and hydraulic system. BACKGROUND
[0002] The overflow valve can be opened when the pressure of the hydraulic oil reaches the preset pressure, so that the high-pressure hydraulic oil is discharged through the channel of the oil inlet and the oil outlet to relieve pressure, which is the key guarantee for the safe application of pressure pipelines and pressure vessels.
[0003] In the prior art, the overflow valve for the walking motor of a small crawler excavator can perform two-stage pressure relief of pre-oil discharge and normal oil discharge when the motor stops, thereby reducing the impact of motor stop. However, the damping structure of the above overflow valve is relatively complex, and is usually arranged away from the oil inlet, which can easily cause oil pressure loss and affect the accuracy of the opening threshold of the overflow valve. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing an overflow valve and hydraulic system, which can reduce the oil pressure loss when the hydraulic oil reaches the damping structure and improve the accuracy.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] An overflow valve comprises:
[0007] A main valve sleeve comprising a main valve cavity, an oil inlet and an oil outlet communicating with the main valve cavity;
[0008] An adjusting assembly arranged in the main valve sleeve, the adjusting assembly comprising a buffer cavity, and the adjusting assembly being movable along the axial direction of the main valve sleeve;
[0009] A valve core assembly arranged in the main valve cavity, the valve core assembly comprising an adjusting valve core and a moving valve core, one end of the adjusting valve core being located in the buffer cavity, the other end of the adjusting valve core being provided with a guide groove, the moving valve core being slidingly arranged in the guide groove, the adjusting valve core being provided with a first communication hole, the moving valve core being provided with a second communication hole, the first communication hole and the second communication hole jointly communicating the oil inlet and the buffer cavity, and the second communication hole being provided with a damping structure;
[0010] An elastic member arranged between the adjusting valve core and the moving valve core to drive the moving valve core to block the oil inlet.
[0011] As an alternative to the above-mentioned overflow valve, the second communication hole comprises a first blind hole and a second blind hole, the damping structure comprises a damping hole and a through hole opened in the side wall of the moving valve core, the damping hole is in communication with the second blind hole, the through hole is in communication with the first blind hole, and the part of the moving valve core between the damping hole and the through hole is spaced apart from the guide groove.
[0012] As an alternative to the above-mentioned overflow valve, the damping structure further comprises a first annular groove and a second annular groove arranged on the side wall of the moving valve core, and a damping surface located between the first annular groove and the second annular groove, the damping hole is opened in the first annular groove, the through hole is opened in the second annular groove, and the damping surface is in clearance fit with the side wall of the guide groove to form an annular damping between the damping surface and the side wall of the guide groove.
[0013] As an alternative to the above-mentioned overflow valve, the regulating valve core is provided with a limiting boss on the outer peripheral surface of one end in the buffer cavity, and the limiting boss is in clearance fit with the side wall of the buffer cavity.
[0014] As an alternative to the above-mentioned overflow valve, the regulating valve core comprises a valve core body and a spring seat, the valve core body is fixedly connected with the spring seat, the guide groove is arranged on the spring seat, a supporting boss is arranged on the outer peripheral surface of the spring seat, and the elastic member is sleeved on the spring seat and abuts against the supporting boss.
[0015] As an alternative to the above-mentioned overflow valve, a plurality of oil storage grooves are arranged on the outer periphery of the valve core body in an axial direction.
[0016] As an alternative to the above-mentioned overflow valve, the moving valve core has a conical surface on one end close to the oil inlet, and the conical surface abuts against the outer peripheral surface of the oil inlet to form an annular seal to block the oil inlet.
[0017] As an alternative to the above-mentioned overflow valve, the regulating assembly comprises a regulating sleeve and a plug, the regulating sleeve is arranged in the main valve cavity and is threadedly connected with the main valve cavity, and the plug blocks one end of the regulating sleeve to form the buffer cavity in the regulating sleeve.
[0018] As an alternative to the above-mentioned overflow valve, the regulating assembly further comprises a locking nut, the locking nut is sleeved on the outside of the regulating sleeve and is threadedly connected with the regulating sleeve, and the locking nut is configured to abut against the main valve sleeve to lock the relative position between the main valve sleeve and the regulating sleeve.
[0019] A hydraulic system comprising the overflow valve.
[0020] The beneficial effects of the utility model are as follows:
[0021] The utility model provides a kind of overflow valve and hydraulic system.The oil pressure of the oil inlet of the overflow valve is raised to reach first set oil pressure, and valve element will be opened briefly, at this time, pre-leakage part of hydraulic oil is discharged.When the oil pressure of the oil inlet continues to rise, adjusting valve element will move towards the direction close to the oil inlet, so as to compress elastic member, and elastic member can drive dynamic valve element to block the oil inlet.When the oil pressure of the oil inlet further rises to reach second set oil pressure, the force of the oil pressure of the oil inlet on dynamic valve element is greater than the elastic force of elastic member, and dynamic valve element opens the oil inlet again, and the overflow valve carries out normal pressure relief.
[0022] The setting of the adjusting assembly can accurately adjust the opening oil pressure of the overflow valve, so that the oil pressure threshold of the two openings of the overflow valve is closer to the first set oil pressure and the second set oil pressure, and the accuracy is guaranteed. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 is the sectional view of the overflow valve provided by the utility model;
[0024] Figure 2 is Figure 1 the local enlarged view of A in
[0025] in the figure:
[0026] 1, main valve sleeve; 11, main valve cavity; 12, oil inlet; 13, oil outlet; 14, pressure relief port;
[0027] 2, adjusting assembly; 21, adjusting sleeve; 211, buffer cavity; 22, plug; 23, locking nut;
[0028] 3, valve element assembly; 31, adjusting valve element; 311, valve element main body; 3111, limiting boss; 3112, oil storage groove; 3113, first through hole; 312, spring seat; 3121, guide groove; 3122, support boss; 3123, second through hole; 313, first communication hole; 314, driving groove; 32, dynamic valve element; 321, small diameter section; 322, large diameter section; 323, second communication hole; 3231, first blind hole; 3232, second blind hole; 3233, via hole; 3234, damping hole; 324, conical surface; 3235, first ring groove; 3236, second ring groove; 3237, damping surface;
[0029] 4, elastic member. DETAILED DESCRIPTION
[0030] The embodiments of the present application are described below in detail, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0031] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.
[0032] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0033] Unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0034] The technical scheme of the present application is further illustrated below by combining the drawings and through specific embodiments.
[0035] The present embodiment provides a kind of hydraulic system, which includes walking motor and overflow valve, overflow valve is communicated with walking motor, overflow valve can open pressure relief when pressure exceeds threshold value, to monitor the pressure inside when motor works, so that it always does not exceed the set pressure of overflow valve, protect motor to work under safe pressure.
[0036] As Figure 1 shown, in the present embodiment, the overflow valve comprises a main valve sleeve 1, an adjusting assembly 2, a valve core assembly 3 and an elastic member 4, the main valve sleeve 1 comprises a main valve cavity 11, an oil inlet 12 and an oil outlet 13 which communicate with the main valve cavity 11; the adjusting assembly 2 is arranged in the main valve sleeve 1, the adjusting assembly 2 comprises a buffer cavity 211, the adjusting assembly 2 can move along the axial direction of the main valve sleeve 1; the valve core assembly 3 comprises an adjusting valve core 31 and a moving valve core 32, the adjusting valve core 31 and the moving valve core 32 are arranged in the main valve cavity 11, one end of the adjusting valve core 31 is located in the buffer cavity 211, the other end of the adjusting valve core 31 is provided with a guide groove 3121, the moving valve core 32 is slidingly arranged in the guide groove 3121, the adjusting valve core 31 is provided with a first communication hole 313, the moving valve core 32 is provided with a second communication hole 323, the first communication hole 313 and the second communication hole 323 jointly communicate the oil inlet 12 and the buffer cavity 211, the elastic member 4 is arranged between the adjusting valve core 31 and the moving valve core 32 to drive the moving valve core 32 to block the oil inlet 12.
[0037] When the oil pressure of the oil inlet 12 of the overflow valve rises to the first set oil pressure, the moving valve core 32 will be temporarily opened, at this time, a part of the hydraulic oil is pre-bleeded. When the oil pressure of the oil inlet 12 continues to rise, the adjusting valve core 31 will move towards the oil inlet 12, thereby compressing the elastic member 4, and the elastic member 4 can drive the moving valve core 32 to block the oil inlet 12. When the oil pressure of the oil inlet 12 further rises to the second set oil pressure, the oil pressure of the oil inlet 12 on the moving valve core 32 is greater than the elastic force of the elastic member 4, the moving valve core 32 opens the oil inlet 12 again, and the overflow valve performs normal pressure relief.
[0038] The adjusting assembly 2 can accurately adjust the opening oil pressure of the overflow valve, so that the oil pressure threshold of the two openings of the overflow valve is closer to the first set oil pressure and the second set oil pressure, thereby ensuring the accuracy. The above overflow valve is mostly used on the walking motor of a small crawler excavator, and can perform two-stage pressure relief of pre-bleeding and normal bleeding when the walking motor stops, thereby reducing the impact when the walking motor stops.
[0039] In the present embodiment, the valve core assembly 3 is provided with a damping structure, when the oil pressure of the oil inlet 12 rises to the first set oil pressure, the moving valve core 32 will be temporarily opened, and due to the arrangement of the damping structure, the time for the adjusting valve core 31 to compress the elastic member 4 is prolonged, so that the time for the moving valve core 32 to be temporarily opened is prolonged, the pre-bleeding stage is prolonged, and the pre-bleeding stage is avoided to be too short or even not to occur due to the too fast action of the adjusting valve core 31, thereby ensuring the normal function of the two-stage oil bleeding of the overflow valve.
[0040] As Figure 1As shown, the adjusting assembly 2 comprises an adjusting sleeve 21 and a plug 22, the adjusting sleeve 21 is arranged in the main valve cavity 11 and is threadedly connected with the main valve cavity 11, and the plug 22 seals one end of the adjusting sleeve 21 to form a buffer cavity 211 in the adjusting sleeve 21. The plug 22 is used to seal the main valve cavity 11 to avoid hydraulic oil leakage, and can abut against the adjusting spool 31 to limit the adjusting spool 31. With the rotation of the adjusting sleeve 21, the adjusting sleeve 21 will move along the axial direction of the main valve sleeve 1, thereby pushing the adjusting spool 31 to change the first set oil pressure and the second set oil pressure.
[0041] In the existing overflow valve, the precision control of the first set oil pressure and the second set oil pressure can only reach plus or minus 40 bar. If the precision is to be further improved, the qualified rate will be greatly reduced, or the precision of the parts needs to be greatly improved, which increases the processing difficulty and affects the cost. However, the overflow valve in the embodiment can make the pressure adjustment more accurate without changing the processing technology of the overflow valve, and can reach plus or minus 3 bar.
[0042] The buffer cavity 211 of the adjusting sleeve 21 can provide power for the movement of the adjusting spool 31. When the hydraulic oil enters the buffer cavity 211, the oil pressure of the hydraulic oil can drive the adjusting spool 31 to move towards the oil inlet 12, thereby compressing the elastic member 4.
[0043] Further, the outer peripheral surface of one end of the adjusting spool 31 in the buffer cavity 211 is provided with a limiting boss 3111, and the limiting boss 3111 is in clearance fit with the side wall of the buffer cavity 211. The limiting boss 3111 can improve the uniformity of the pressure of the hydraulic oil in the buffer cavity 211 on the adjusting spool 31, and ensure the stability of the movement of the adjusting spool 31.
[0044] As shown, Figure 1 The adjusting assembly 2 further comprises a locking nut 23, the locking nut 23 is sleeved on the outside of the adjusting sleeve 21 and is threadedly connected with the adjusting sleeve 21, and the locking nut 23 is configured to abut against the main valve sleeve 1 to lock the relative position between the main valve sleeve 1 and the adjusting sleeve 21. By rotating the locking nut 23 to make the locking nut 23 abut against the main valve sleeve 1, the relative position between the adjusting sleeve 21 and the main valve sleeve 1 can be locked, and the stability of the first set oil pressure and the second set oil pressure of the overflow valve is ensured.
[0045] It can be understood that the farther the damping structure is from the oil inlet 12 and the more complex the damping structure is, the greater the oil pressure loss of the hydraulic oil entering the buffer cavity 211 will be, which will cause a large deviation between the action of the adjusting spool 31 and the design. To solve this problem, the damping structure of the spool assembly 3 is arranged on the second communication hole 323, that is, on the movable spool 32.
[0046] Since the damping structure of the valve core assembly 3 is arranged on the moving valve core 32, it is closer to the hydraulic valve, so that the oil pressure loss of the hydraulic oil is smaller when reaching the damping structure, and the rate and time of the hydraulic oil passing through the damping structure can be closer to the designed parameters, improving the accuracy.
[0047] As shown in Figure 1 and Figure 2 , the second communication hole 323 includes a first blind hole 3231 and a second blind hole 3232, the damping structure includes a damping hole 3234 and a via hole 3233 opened in the side wall of the moving valve core 32, the damping hole 3234 communicates with the second blind hole 3232, the via hole 3233 communicates with the first blind hole 3231, and the part of the moving valve core 32 between the damping hole 3234 and the via hole 3233 is spaced apart from the guide groove 3121.
[0048] When the hydraulic oil flows from the first blind hole 3231 to the second blind hole 3232, only the position of the damping hole 3234 is subjected to obvious damping action, and the number of times of changing the flow direction of the hydraulic oil is less, which can not only play a damping effect on the hydraulic oil and slow down the movement of the adjusting valve core 31, but also avoid the oil pressure loss of the hydraulic oil.
[0049] As shown in Figure 1 and Figure 2 , the damping structure further includes a first annular groove 3235, a second annular groove 3236 arranged on the side wall of the moving valve core 32, and a damping surface 3237 located between the first annular groove 3235 and the second annular groove 3236, the damping hole 3234 is opened in the first annular groove 3235, the via hole 3233 is opened in the second annular groove 3236, and the damping surface 3237 is in gap cooperation with the side wall of the guide groove 3121 to form an annular damping between the damping surface 3237 and the side wall of the guide groove 3121.
[0050] The annular damping formed between the damping surface 3237 and the side wall of the guide groove 3121 can damp the hydraulic oil without changing the flow direction of the hydraulic oil, and since the damping coefficient of the annular damping along the circumference of the moving valve core 32 is equal everywhere, it can also improve the stability of the hydraulic oil flowing through the annular damping. The arrangement of the first annular groove 3235 enables the hydraulic oil to flow circumferentially to the gap between the damping surface 3237 and the side wall of the guide groove 3121 before passing through the annular damping, so that the hydraulic oil passes through the annular damping uniformly, and the arrangement of the second annular groove 3236 enables the hydraulic oil passing through the annular damping to flow to the damping hole 3234, ensuring the communication of the first blind hole 3231 and the second blind hole 3232.
[0051] In order to ensure the reliability of the seal between the movable valve core 32 and the oil inlet 12, the end of the movable valve core 32 close to the oil inlet 12 is provided with a tapered surface 324, and the tapered surface 324 abuts against the outer peripheral surface of the oil inlet 12 to form an annular seal to block the oil inlet 12. This structure can greatly reduce the requirement for machining precision and ensure that reliable sealing can be achieved between the movable valve core 32 and the oil inlet 12.
[0052] As shown in Figure 1 The movable valve core 32 includes a large-diameter section 322 and a small-diameter section 321, and the small-diameter section 321 is slidingly arranged in the guide groove 3121, and the large-diameter section 322 slidingly abuts against the inner wall of the main valve chamber 11. The large-diameter section 322 is guided by the inner wall of the main valve chamber 11, and the small-diameter section 321 is guided by the inner wall of the guide groove 3121, which ensures the stability of the movable valve core 32 in the radial direction of the main valve sleeve 1 and improves the sealing between the movable valve core 32 and the oil inlet 12.
[0053] Further, the main valve sleeve 1 is also provided with a pressure relief port 14 communicating with the main valve chamber 11, and the pressure relief port 14 and the oil outlet 13 are located on the two sides of the large-diameter section 322 in the axial direction. The pressure relief port 14 can relieve the pressure of the main valve chamber 11 to avoid the influence of the over-high oil pressure in the main valve chamber 11 on the service life of the overflow valve.
[0054] In this embodiment, the adjusting valve core 31 includes a valve core body 311 and a spring seat 312, the valve core body 311 is fixedly connected with the spring seat 312, the guide groove 3121 is arranged in the spring seat 312, the outer peripheral surface of the spring seat 312 is provided with a support boss 3122, and the elastic member 4 is sleeved on the spring seat 312 and abuts against the support boss 3122.
[0055] Since the limiting boss 3111 is located inside the sleeve, and the support boss 3122 is located outside the sleeve, the adjusting valve core 31 is arranged as the valve core body 311 and the spring seat 312, which facilitates the assembly of the overflow valve. In order to ensure the reliability of the connection between the valve core body 311 and the spring seat 312, the valve core body 311 is provided with a connecting groove, and the spring seat 312 is partially arranged in the connecting groove and is in interference fit with the connecting groove.
[0056] The valve core body 311 is provided with a first through hole 3113, the spring seat 312 is provided with a second through hole 3123, and the first through hole 3113 and the second through hole 3123 are in communication to form a first communication hole 313. The end surface of the spring seat 312 abuts against the end surface of the valve core body 311 in the connecting groove to reduce the space at the connecting position of the first through hole 3113 and the second through hole 3123, avoid the change of the flow direction of the hydraulic oil being too large, and thus reduce the oil pressure loss.
[0057] As shown in Figure 1As shown, the end face of the valve core body 311 abutting one end of the plug 22 is provided with a driving groove 314, and the first through hole 3113 is arranged in the driving groove 314. Before the adjusting valve core 31 moves towards the oil inlet 12, the end face of the valve core body 311 is in contact with the plug 22. At this time, the hydraulic oil in the buffer cavity 211 can apply a force to the valve core body 311 in the direction away from the oil inlet 12 through the limiting boss 3111, so that the adjusting valve core 31 is difficult to separate from the plug 22.
[0058] The driving groove 314 is arranged so that the hydraulic oil can fill the driving groove 314 before pushing the adjusting valve core 31 to move, greatly increasing the initial action area of the hydraulic oil on the valve core body 311 and ensuring the movement of the adjusting valve core 31.
[0059] Further, the outer periphery of the valve core body 311 is axially spaced apart and provided with a plurality of oil storage grooves 3112. The adjusting sleeve 21 is in clearance fit with the valve core body 311, so that the hydraulic oil can slowly flow through the gap between the adjusting sleeve 21 and the valve core body 311, and at this time the hydraulic oil can also fill the oil storage groove 3112, so that the adjusting sleeve 21 and the valve core body 311 always exist hydraulic oil, ensuring the lubrication between the valve core body 311 and the adjusting sleeve 21.
[0060] The above is only the preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as limiting the present application.
Claims
1. A relief valve characterized by, The utility model relates to a valve, which comprises: a main valve sleeve (1) comprising a main valve cavity (11) and an oil inlet (12) and an oil outlet (13) communicating with the main valve cavity (11); an adjusting assembly (2) arranged in the main valve sleeve (1), the adjusting assembly (2) comprising a buffer cavity (211) arranged therein, and the adjusting assembly (2) being movable along the axial direction of the main valve sleeve (1); a valve core assembly (3) arranged in the main valve cavity (11), the valve core assembly (3) comprising an adjusting valve core (31) and a dynamic valve core (32), one end of the adjusting valve core (31) being located in the buffer cavity (211), the other end of the adjusting valve core (31) being provided with a guide groove (3121), the dynamic valve core (32) being slidingly arranged in the guide groove (3121), the adjusting valve core (31) being provided with a first communication hole (313), the dynamic valve core (32) being provided with a second communication hole (323), the first communication hole (313) and the second communication hole (323) jointly communicating the oil inlet (12) and the buffer cavity (211), the second communication hole (323) being provided with a damping structure; an elastic member (4) arranged between the adjusting valve core (31) and the dynamic valve core (32) to drive the dynamic valve core (32) to block the oil inlet (12).
2. The overflow valve of claim 1, wherein The second communication hole (323) comprises a first blind hole (3231) and a second blind hole (3232), the damping structure comprises a damping hole (3234) and a via hole (3233) arranged in the side wall of the dynamic valve core (32), the damping hole (3234) communicates with the second blind hole (3232), the via hole (3233) communicates with the first blind hole (3231), and the part of the dynamic valve core (32) between the damping hole (3234) and the via hole (3233) is arranged in a spaced manner with the guide groove (3121).
3. The overflow valve of claim 2, wherein The damping structure further comprises a first ring groove (3235), a second ring groove (3236) and a damping surface (3237) arranged in the side wall of the dynamic valve core (32) and located between the first ring groove (3235) and the second ring groove (3236), the damping hole (3234) is arranged in the first ring groove (3235), the via hole (3233) is arranged in the second ring groove (3236), and the damping surface (3237) is in a clearance fit with the side wall of the guide groove (3121) to form an annular damping between the damping surface (3237) and the side wall of the guide groove (3121).
4. The relief valve of claim 1, wherein The outer peripheral surface of one end of the adjusting valve core (31) located in the buffer cavity (211) is provided with a limiting boss (3111), and the limiting boss (3111) is in a clearance fit with the side wall of the buffer cavity (211).
5. The relief valve of claim 1, wherein The adjusting valve core (31) comprises a valve core body (311) and a spring seat (312), the valve core body (311) is fixedly connected with the spring seat (312), the guide groove (3121) is arranged on the spring seat (312), and an outer peripheral surface of the spring seat (312) is provided with a supporting boss (3122); and the elastic member (4) is sleeved on the spring seat (312) and abuts against the supporting boss (3122).
6. The overflow valve of claim 5, wherein An outer periphery of the valve core body (311) is provided with a plurality of oil storage grooves (3112) at intervals in the axial direction.
7. The relief valve of claim 1, wherein The dynamic valve core (32) has a conical surface (324) at one end close to the oil inlet (12), the conical surface (324) abuts against an outer peripheral surface of the oil inlet (12) to form annular sealing to block the oil inlet (12).
8. The relief valve of claim 1, wherein The adjusting assembly (2) comprises an adjusting sleeve (21) and a plug (22), the adjusting sleeve (21) is arranged in the main valve cavity (11) and is threadedly connected with the main valve cavity (11), and the plug (22) blocks one end of the adjusting sleeve (21) to form the buffer cavity (211) in the adjusting sleeve (21).
9. The overflow valve of claim 8, wherein The adjusting assembly (2) further comprises a locking nut (23), the locking nut (23) is sleeved on an outer portion of the adjusting sleeve (21) and is threadedly connected with the adjusting sleeve (21), and the locking nut (23) is configured to abut against the main valve sleeve (1) to lock the relative position between the main valve sleeve (1) and the adjusting sleeve (21).
10. A hydraulic system characterized by, The hydraulic system comprises the overflow valve according to any one of claims 1-9.