Pressure reducing valve

Abstract

The application relates to the technical field of valves, and discloses a pressure reducing valve, which comprises a valve body, a main valve sleeve and a valve core, the valve body is provided with a valve cavity, the main valve sleeve is arranged on the valve body and partially located in the valve cavity, the main valve sleeve is provided with a pressure reducing port, an oil inlet hole and a cavity in communication, the cavity comprises a first cavity and a second cavity in communication with each other, the first cavity is communicated with the oil inlet hole, and the second cavity is communicated with the pressure reducing port; the valve core is movably arranged in the cavity; wherein the outer diameter of the second cavity is larger than that of the first cavity to form a first step surface, along the axial direction of the valve core, the valve core is provided with a first end located in the second cavity, the first end is provided with a first conical surface facing the first step surface, and the first conical surface is abutted or separated from the inner periphery of the first step surface to block or communicate the first cavity and the second cavity. The pressure reducing valve improves the sealing performance.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a pressure reducing valve. Background Technology

[0002] Pressure reducing valves are primarily used in low-pressure hydraulic systems. In the low-pressure branch circuits of hydraulic systems, they precisely control the working pressure, ensuring stable operation of actuators within a safe pressure range. In multi-stage pressure control systems, especially for complex hydraulic systems requiring multi-stage pressure output, pressure reducing valves can achieve graded pressure control for different branches, meeting diverse operational needs. They can also be used in the protection circuits of actuators. Installing pressure reducing valves in the inlet lines of hydraulic cylinders and hydraulic motors effectively prevents pressure surges from damaging the actuators.

[0003] The main function of a pressure reducing valve in a system is to maintain a relatively constant pressure on the actuator side, even if the inlet pressure is high or fluctuating. Therefore, improving the sealing performance of pressure reducing valves is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a pressure reducing valve that improves sealing performance.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, this application provides a pressure reducing valve, including a valve body, a main valve sleeve, and a valve core. The valve body has a valve cavity. The main valve sleeve is disposed in the valve body and partially located in the valve cavity. The main valve sleeve has a pressure reducing port, an oil inlet, and a cavity that are connected to each other. The cavity includes a first cavity and a second cavity that are connected to each other. The first cavity is connected to the oil inlet, and the second cavity is connected to the pressure reducing port. The valve core is movably disposed in the cavity. The outer diameter of the second cavity is larger than the outer diameter of the first cavity to form a first stepped surface. Along the axial direction of the valve core, the valve core has a first end located in the second cavity. The first end has a first conical surface facing the first stepped surface. The first conical surface blocks or connects the first cavity and the second cavity by abutting against or moving away from the inner circumference of the first stepped surface.

[0007] The pressure reducing valve proposed in this application uses the inner circumference of the conical surface and the stepped surface to seal the space between the first cavity and the second cavity, effectively blocking the oil penetration path and significantly reducing the risk of high-pressure oil leakage from the first cavity to the second cavity. In other words, it reduces the probability of high-pressure oil leakage from the oil inlet to the pressure reducing port, significantly improves the sealing effect, and reduces the probability of pipeline system damage caused by excessive pressure at the pressure relief port.

[0008] Optionally, the outer peripheral surface of the valve core is provided with a first groove, and when the first conical surface is away from the inner peripheral edge of the first step surface, the first groove communicates with the first cavity and the second cavity respectively.

[0009] In the above scheme, the first groove provides a clear and smooth channel for the oil to flow from the first cavity to the second cavity. When the valve core moves and the sealing surface is disengaged, the high-pressure oil does not need to diffuse disorderly in the cavity to find a flow path. It can directly and quickly connect the two cavities through the first groove, reduce the local resistance loss in the oil flow process, improve the response speed of pressure reduction regulation, and ensure that the pressure reducing port can obtain the required flow in time.

[0010] Optionally, along the circumference of the valve core, the first groove is constructed as an annular structure with the ends connected.

[0011] In the above scheme, the annular first groove can form a continuous flow channel on the outer periphery of the valve core, ensuring that when the high-pressure oil flows from the first cavity to the second cavity, it can be evenly distributed along the circumference of the valve core, reducing the problem of radial pressure imbalance during oil flow, making the valve core more uniformly stressed under pressure, and reducing the risk of valve core tilting or jamming caused by excessive stress on one side.

[0012] Optionally, along the axial direction of the valve core, the first conical surface has a second end and a third end. When the first conical surface abuts against the inner circumference of the first stepped surface, the second end is located in the first cavity and the third end is located in the second cavity.

[0013] In the above scheme, since the second end is located in the first cavity and the third end is located in the second cavity, the contact area between the first conical surface and the inner periphery of the first step surface is located exactly between the second end and the third end. This helps to make the conical surface fit more tightly against the inner periphery of the step surface, enhance the sealing pressure, and reduce the risk of high-pressure oil leakage from the contact gap.

[0014] Optionally, along the axial direction of the valve core, the first groove has a fourth end and a fifth end disposed opposite to each other, the fourth end being farther away from the first conical surface than the fifth end, and the fourth end having a second conical surface.

[0015] In the above scheme, the gradual transition structure formed by the second conical surface can guide the high-pressure oil in the first cavity to enter the first groove more smoothly, which helps to improve stability. When the oil flows from the first cavity to the groove, the inclination angle of the conical surface can help the oil gradually change its flow direction, reduce the probability of local eddies caused by right angle or acute angle transitions, and allow the oil to enter the groove channel with lower resistance, which helps to improve the smoothness of oil flow.

[0016] Optionally, the inner peripheral wall of the first cavity is provided with a second groove, which is arranged opposite to the oil inlet hole along the radial direction of the valve core.

[0017] In the above scheme, the second groove can further increase the flow area of ​​the high-pressure oil, so that the oil flows more smoothly from the oil inlet into the first cavity, avoiding pressure fluctuations caused by sudden contraction of the flow section. At the same time, it reduces the probability of burrs being generated during the processing of the connection between the first cavity and the oil inlet, thereby reducing the probability of oil circuit blockage and improving the reliability of pressure relief.

[0018] Optionally, along the circumference of the valve core, the second groove is constructed as an annular structure with the ends connected.

[0019] In the above scheme, the annular second groove can form a continuous flow channel on the outer circumference of the valve core, ensuring that when the high-pressure oil flows from the oil inlet to the first cavity, it can be evenly distributed along the circumference of the valve core, reducing the problem of radial pressure imbalance during oil flow, making the valve core more evenly stressed under pressure, and reducing the risk of valve core tilting or jamming due to excessive force on one side.

[0020] Optionally, the second groove and the second cavity are spaced apart along the axial direction of the valve core.

[0021] In the above scheme, a portion of the inner wall of the main valve sleeve is retained between the second groove and the second cavity, which helps to ensure the flow area. At the same time, there is no need to adjust the diameter of the valve core, and the valve core can maintain a uniform diameter specification, reducing the difficulty of dimensional accuracy control during the processing and avoiding assembly and adaptation problems caused by changes in the valve core diameter.

[0022] Optionally, there are multiple oil inlet holes, which are spaced apart circumferentially along the main valve sleeve.

[0023] In the above scheme, multiple circumferentially spaced oil inlets allow high-pressure oil to enter the first cavity simultaneously from different directions. Combined with the second groove on the inner circumferential wall of the first cavity, a more comprehensive circumferential oil supply can be formed, avoiding the localized oil concentration phenomenon caused by a single oil inlet. The oil flows evenly into the cavity along the circumference of the main valve sleeve, which can reduce the radial pressure deviation caused by unilateral oil supply. This allows the valve core to maintain circumferential force balance in the initial stress stage, reducing the risk of the valve core tilting or jamming due to uneven force.

[0024] Optionally, a sealing groove is also provided on the outer surface of the main valve sleeve. Along the axial direction of the valve core, the sealing groove is located between the oil inlet and the pressure reducing port. The pressure reducing valve also includes a sealing ring, which is sleeved in the sealing groove.

[0025] In the above scheme, the sealing ring can form a radial sealing barrier on the outside of the main valve sleeve, directly cutting off the potential path of high pressure oil leakage from the oil inlet side to the pressure reducing port side through the fitting gap. At the same time, the elastic deformation of the sealing ring can tightly fit the outer surface of the main valve sleeve and the inner wall of the pipeline, effectively blocking the cross-leakage of pressure oil and ensuring pressure isolation between the high pressure chamber and the low pressure chamber. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the overall structure in some embodiments of this application;

[0028] Figure 2 This is a top view of the structure in some embodiments of this application;

[0029] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0030] Figure 4 for Figure 3 A magnified structural diagram at point B in the middle.

[0031] [Explanation of Labels in the Attached Image]

[0032] 100: Valve body; 100a: Valve chamber;

[0033] 200: Main valve sleeve; 210: Pressure reducing port; 220: Oil inlet;

[0034] 230: Cavity; 231: First cavity; 232: Second cavity;

[0035] 240: First step surface;

[0036] 250: Second groove;

[0037] 260: Sealing groove;

[0038] 300: Valve core; 310: First end;

[0039] 311: First conical surface; 311a: Second end; 311b: Third end;

[0040] 320: First groove; 321: Fourth end; 322: Fifth end; 323: Second conical surface;

[0041] 400: Sealing ring. Detailed Implementation

[0042] 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.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] Pressure reducing valves are primarily used in low-pressure hydraulic systems. In the low-pressure branch circuits of hydraulic systems, they precisely control the working pressure, ensuring stable operation of actuators within a safe pressure range. In multi-stage pressure control systems, especially for complex hydraulic systems requiring multi-stage pressure output, pressure reducing valves can achieve graded pressure control for different branches, meeting diverse operational needs. They can also be used in the protection circuits of actuators. Installing pressure reducing valves in the inlet lines of hydraulic cylinders and hydraulic motors effectively prevents pressure surges from damaging the actuators.

[0049] The main function of a pressure reducing valve in a system is to maintain a relatively constant pressure on the actuator side, even if the inlet pressure is high or fluctuating. Compared to a typical spool-type pressure reducing valve, a leak-free pressure reducing valve is leak-free in the closed state and does not require disconnection of the oil line.

[0050] In wind power hydraulic systems, in addition to the above-mentioned functions, the pressure reducing valves are required to be leak-free.

[0051] In view of this, in order to improve the sealing performance of the pressure reducing valve, this application provides a pressure reducing valve, including a valve body 100, a main valve sleeve 200, and a valve core 300. The valve body 100 has a valve cavity 100a; the main valve sleeve 200 is disposed in the valve body 100 and partially located in the valve cavity 100a. The main valve sleeve 200 has a communicating pressure reducing port 210, an oil inlet 220, and a cavity 230. The cavity 230 includes a first cavity 231 and a second cavity 232 that are communicating with each other. The first cavity 231 communicates with the oil inlet 220, and the second cavity 232 communicates with the pressure reducing port 210. The valve core 300 is movably disposed in the cavity 230; wherein, the outer diameter of the second cavity 232 is larger than the outer diameter of the first cavity 231 to form a first stepped surface 240. Along the axial direction of the valve core 300, the valve core 300 has a first end 310 located in the second cavity 232. End 310 has a first conical surface 311 facing the first stepped surface 240. The first conical surface 311 blocks or connects the first cavity 231 and the second cavity 232 by abutting or moving away from the inner circumferential edge of the first stepped surface 240. That is, the abutting state between the first conical surface 311 and the inner circumferential edge of the first stepped surface 240 controls the connection state of the first cavity 231 and the second cavity 232. When the first conical surface 311 abuts with the inner circumferential edge of the first stepped surface 240, it blocks the first cavity 231 and the second cavity 232. When the first conical surface 311 separates from the inner circumferential edge of the first stepped surface 240, it connects the first cavity 231 and the second cavity 232, reducing the probability of high-pressure oil leaking from the oil inlet 220 to the pressure reducing port 210, significantly improving the sealing effect, and reducing the probability of damage to the pipeline system caused by excessive pressure at the pressure relief port.

[0052] The pressure reducing valve proposed in this application is described below with reference to the accompanying drawings.

[0053] Please refer to Figure 1 , Figure 2 and Figure 3 The pressure reducing valve according to the first aspect of this application includes a valve body 100, a main valve sleeve 200 and a valve core 300.

[0054] The valve body 100 has a valve cavity 100a; the main valve sleeve 200 is disposed in the valve body 100 and partially located in the valve cavity 100a. The main valve sleeve 200 has a pressure reducing port 210, an oil inlet port 220 and a cavity 230 that are connected. The cavity 230 includes a first cavity 231 and a second cavity 232 that are connected to each other. The first cavity 231 is connected to the oil inlet port 220 and the second cavity 232 is connected to the pressure reducing port 210.

[0055] Understandably, the main valve sleeve 200 can be fixedly installed on the valve body 100 to ensure that the main valve sleeve 200 does not shift or loosen under fluid pressure, and the high-pressure oil can flow along a predetermined path. At the same time, the first cavity 231 and the second cavity 232 can provide a clear flow path for the high-pressure oil, which helps to ensure the pressure relief effect.

[0056] The valve core 300 is movably disposed in the cavity 230; thus, its position can be flexibly adjusted according to the pressure difference between the oil inlet 220 and the pressure reducing port 210. When the pressure in the oil inlet 220 increases, the thrust of the high-pressure oil on the valve core 300 increases, which can push the valve core 300 to move until the first cavity 231 and the second cavity 232 are blocked. When the pressure in the oil inlet 220 decreases or the pressure reducing port 210 needs to replenish the flow, the valve core 300 can move in the opposite direction under the action of the pressure difference, so that the oil can pass through and continue to relieve pressure.

[0057] Wherein, the outer diameter of the second cavity 232 is larger than the outer diameter of the first cavity 231 to form a first stepped surface 240. Along the axial direction of the valve core 300, the valve core 300 has a first end 310 located in the second cavity 232. The first end 310 has a first conical surface 311 facing the first stepped surface 240. The first conical surface 311 blocks or connects the first cavity 231 and the second cavity 232 by abutting against or moving away from the inner circumference of the first stepped surface 240.

[0058] The pressure reducing valve proposed in this application embodiment uses the inner circumference of the first conical surface 311 and the first stepped surface 240 to seal the space between the first cavity 231 and the second cavity 232, effectively blocking the oil penetration path and significantly reducing the risk of high-pressure oil leakage from the first cavity 231 to the second cavity 232. In other words, it reduces the probability of high-pressure oil leakage from the oil inlet 220 to the pressure reducing port 210, significantly improves the sealing effect, and reduces the probability of pipeline system damage caused by excessive pressure at the pressure relief port.

[0059] In a specific embodiment, the valve core 300 has an open position and a closed position. When the valve core 300 is in the open position, the first conical surface 311 is away from the inner periphery of the first stepped surface 240, so that high-pressure oil can enter the second cavity 232 from the first cavity 231 through the first conical surface 311.

[0060] When the valve core 300 is in the closed position, the first conical surface 311 abuts against the inner circumference of the first stepped surface 240 to form a seal, preventing the high-pressure oil in the first cavity 231 from entering the second cavity 232.

[0061] In other embodiments, please refer to Figure 3 The outer peripheral surface of the valve core 300 is provided with a first groove 320. When the first conical surface 311 is far away from the inner peripheral edge of the first stepped surface 240, the first groove 320 is connected to the first cavity 231 and the second cavity 232 respectively.

[0062] Understandably, the first groove 320 provides a clear and smooth channel for oil to flow from the first cavity 231 to the second cavity 232. When the valve core 300 moves and the sealing surface disengages, the high-pressure oil does not need to diffuse disorderly within the cavity to find a flow path. It can directly flow rapidly between the first cavity 231 and the second cavity 232 along the axial direction of the valve core 300 through the first groove 320, reducing local resistance loss during oil flow, improving the response speed of pressure reduction regulation, and ensuring that the high-pressure oil can quickly reach the pressure reducing port 210 for pressure relief.

[0063] Furthermore, the first groove 320 reduces the erosive wear of the oil on the mating clearance between the valve core 300 and the main valve sleeve 200. When the oil flows directionally through the first groove 320, it reduces the direct erosion of the outer peripheral surface of the valve core 300 and the inner wall of the cavity by the high-pressure oil, which helps to reduce the probability of damage to the valve core 300 and indirectly ensures the long-term sealing reliability of the sealing surface.

[0064] In other embodiments, the first groove 320 is configured as an annular structure with the ends connected along the circumference of the valve core 300.

[0065] Understandably, the annular first groove 320 can form a continuous flow channel on the outer periphery of the valve core 300, ensuring that when the high-pressure oil flows from the first cavity 231 to the second cavity 232, it can be evenly distributed along the circumference of the valve core 300 while moving along the axial direction of the valve core 300. This reduces the problem of uneven radial pressure during oil flow, making the valve core 300 more evenly stressed under pressure, and reducing the risk of the valve core 300 tilting or jamming due to excessive force on one side.

[0066] Meanwhile, during the sealing state switching process, the annular structure allows for more synchronized and smooth communication between the first groove 320 and the first cavity 231 and the second cavity 232. When the valve core 300 moves and the sealing surface disengages, the annular groove can instantly achieve full-circumferential oil flow, and the first cavity 231 and the second cavity 232 obtain the maximum flow area. Oil can simultaneously enter the first groove 320 from the full circumference of the valve core 300, which helps to improve the pressure relief efficiency and avoid pressure fluctuations caused by the time difference between some grooves connecting first and others connecting later. When the sealing surface is about to be sealed, the annular groove can also synchronously cut off the flow in the full circumference, ensuring the consistency of sealing switching and reducing instantaneous leakage caused by local failure to seal in time.

[0067] Furthermore, compared to segmented grooves, the annular structure avoids the problem of excessive local stress at the groove ends, improving the structural strength of the valve core 300 under high-frequency movement and high-pressure impact, and extending the service life of the valve core 300. At the same time, the manufacturing process of the annular groove is simpler, ensuring circumferential consistency in groove depth, width, and other dimensions, further ensuring the stability of oil flow and pressure buffering effect.

[0068] In other embodiments, please refer to Figure 3 and Figure 4 Along the axial direction of the valve core 300, the first conical surface 311 has a second end 311a and a third end 311b. When the first conical surface 311 abuts against the inner circumference of the first stepped surface 240, the second end 311a is located in the first cavity 231 and the third end 311b is located in the second cavity 232.

[0069] Understandably, since the second end 311a is located in the first cavity 231 and the third end 311b is located in the second cavity 232, the contact area between the first conical surface 311 and the inner periphery of the first stepped surface 240 is located precisely between the second end 311a and the third end 311b. This helps to make the conical surface fit more tightly against the inner periphery of the stepped surface, enhances the sealing pressure, and reduces the risk of high-pressure oil leakage from the contact gap.

[0070] Before the inner circumference of the first conical surface 311 abuts against the first stepped surface 240, when the second end 311a is located in the first cavity 231, the second end 311a will naturally block the high-pressure oil, reducing the flow area of ​​the high-pressure oil. As the valve core 300 moves towards the sealing position, the depth of the second end 311a in the first cavity 231 gradually increases, and the effective flow area of ​​the oil from the first cavity 231 to the second cavity 232 is further reduced, realizing a smooth transition from high flow to sealing blockage, and avoiding pressure shock caused by sudden change in flow area.

[0071] Furthermore, the gradual reduction of the flow area can slow down the change in oil flow rate, allowing the pressure of the high-pressure oil to initially decrease as it approaches the sealing surface. The partial obstruction of the flow channel by the second end 311a can increase the oil flow resistance, reduce the oil flow rate per unit time, and prevent a large amount of high-pressure oil from rushing towards the sealing surface at high speed when the sealing is about to be completed, thus reducing the risk of instantaneous leakage due to excessive oil kinetic energy.

[0072] In other words, this dynamic adjustment of the flow area achieved by changing the position of the second end 311a allows the valve core 300 to more precisely control the oil flow during its movement. Compared to structures with abrupt changes in flow area, the gradual blocking of the channel makes the pressure change at the pressure reducing port 210 smoother, reduces system pressure fluctuations, and further ensures the reliability of the sealing effect.

[0073] In other embodiments, please refer to Figure 3 and Figure 4 Along the axial direction of the valve core 300, the first groove 320 has a fourth end 321 and a fifth end 322 disposed opposite to each other. The fourth end 321 is farther away from the first conical surface 311 than the fifth end 322. The fourth end 321 has a second conical surface 323.

[0074] Understandably, the gradual transition structure formed by the second conical surface 323 can guide the high-pressure oil in the first cavity 231 to enter the first groove 320 more smoothly, which helps to improve stability. When the oil flows from the first cavity 231 to the groove, the inclination angle of the conical surface can help the oil gradually change its flow direction, reduce the probability of local eddies caused by right angle or acute angle transitions, and allow the oil to enter the groove channel with lower resistance, which helps to improve the smoothness of oil flow.

[0075] Furthermore, when the high-pressure oil flows through the conical surface, the flow velocity gradually transitions along the surface, avoiding drastic velocity changes at the groove inlet and improving the flow regulation response speed of the pressure reducing valve. Simultaneously, this gradual structure disperses the impact force of the oil on the groove inlet, reducing erosion and wear on the edge of the fourth end 321 during long-term use, extending the integrity of the groove structure, and ensuring the stability of its long-term flow performance.

[0076] In other embodiments, please refer to Figure 3 and Figure 4 The inner peripheral wall of the first cavity 231 is provided with a second groove 250 along the radial direction of the valve core 300, and the second groove 250 is arranged opposite to the oil inlet hole 220. It can be understood that the second groove 250 can further increase the flow area of ​​the high-pressure oil, while reducing the probability of burrs being generated during the machining of the connection between the first cavity 231 and the oil inlet hole 220, thereby reducing the probability of oil circuit blockage and improving the reliability of pressure relief.

[0077] In other words, the increased flow area can further improve the pressure relief efficiency, allowing the oil to flow more smoothly from the oil inlet 220 into the first cavity 231, avoiding pressure fluctuations caused by sudden contraction of the flow cross section, and providing a more stable initial flow field for the subsequent pressure regulation of the valve core 300.

[0078] Meanwhile, the connection between the first cavity 231 and the oil inlet 220 is prone to burrs due to processing limitations. This can easily clog the oil passage, and if these burrs fall off, they may enter the valve core 300's mating clearance with the oil, potentially causing the valve core 300 to jam or the sealing surface to wear. The second groove 250, by expanding the space at the connection point, reduces the concentration of cutting stress on the machining tool at this location, thereby reducing the probability of burr formation. Even if a small amount of residual burrs exists, the groove space can further reduce the probability of burrs and oil passage blockage, thus protecting the valve core 300 and the sealing surface.

[0079] In other embodiments, the second groove 250 is configured as an annular structure with the ends connected along the circumference of the valve core 300.

[0080] Understandably, the annular second groove 250 can form a continuous flow channel on the outer periphery of the valve core 300, ensuring that when the high-pressure oil flows from the oil inlet 220 to the first cavity 231, it can be evenly distributed along the circumference of the valve core 300, reducing the problem of radial pressure imbalance during oil flow, making the valve core 300 more evenly stressed under pressure, and reducing the risk of the valve core 300 tilting or jamming due to excessive force on one side.

[0081] Furthermore, the continuous annular channel eliminates dead zones in circumferential flow, allowing the oil entering through the inlet 220 to rapidly diffuse within the groove and form a circumferential circulation. In other words, the annular structure enables the high-pressure oil entering the first cavity 231 to form a natural circumferential flow path. When the oil flows in from the inlet 220, the annular groove guides the oil to diffuse evenly along the circumference, preventing the formation of local eddies due to discontinuous flow paths. This makes the flow of the oil within the cavity more stable, reducing pressure fluctuations caused by turbulent flow and providing a stable fluid environment for pressure regulation of the valve core 300.

[0082] In other embodiments, the second groove 250 and the second cavity 232 are spaced apart along the axial direction of the valve core 300.

[0083] Understandably, a portion of the inner wall of the main valve sleeve 200 is retained between the second groove 250 and the second cavity 232, which helps to ensure the flow area. At the same time, there is no need to adjust the diameter of the valve core 300, and the valve core 300 can maintain a uniform diameter specification, reducing the difficulty of dimensional accuracy control during the processing and avoiding assembly and adaptation problems caused by changes in the diameter of the valve core 300.

[0084] Furthermore, from the perspective of flow stability, the retained inner wall of the main valve sleeve 200 allows for a smoother transition in the flow path of the oil as it flows from the second groove 250 to the second cavity 232. The flow guiding structure formed by this part of the inner wall can avoid abrupt changes in cross-section during oil flow, reduce energy loss caused by local turbulence, and ensure that the oil enters the second cavity 232 at a stable flow rate and pressure.

[0085] In other embodiments, please refer to Figure 1 There are multiple oil inlet holes 220, which are spaced apart circumferentially along the main valve sleeve 200.

[0086] Understandably, the multiple circumferentially spaced oil inlets 220 allow high-pressure oil to enter the first cavity 231 simultaneously from different directions. Combined with the second groove 250 on the inner circumferential wall of the first cavity 231, this creates a more comprehensive circumferential oil supply, avoiding localized oil concentration caused by a single oil inlet 220. The oil flows evenly into the cavity along the circumference of the main valve sleeve 200, reducing radial pressure deviation caused by unilateral oil supply. This allows the valve core 300 to maintain circumferential force balance during the initial stress stage, reducing the risk of tilting or jamming due to uneven force distribution.

[0087] Meanwhile, the multiple oil inlets 220 disperse the input energy of the high-pressure oil, reducing the oil flow rate at each inlet 220. This results in a smoother convergence process within the second groove 250 after entering the first cavity 231, further weakening the impact kinetic energy of the oil and improving the uniformity of pressure changes and the stability of pressure relief. Furthermore, the circumferentially distributed oil inlets 220 form a multi-point corresponding flow guide with the second groove 250, making the circumferential distribution of oil within the second groove 250 more uniform. This facilitates the uniform entry of oil into the first groove 320 of the valve core 300, improving pressure relief efficiency and reducing the impact on sealing surface fit accuracy caused by localized flow fluctuations.

[0088] Furthermore, when individual oil inlet holes 220 are slightly blocked by impurities, the remaining oil inlet holes 220 can continue to supply oil, avoiding abnormal pressure caused by blockage of a single hole. At the same time, the circumferentially dispersed oil inlet method can improve the uniformity of the pressure relief process, help the oil flow out evenly, and help ensure the long-term stability of the pressure reducing valve.

[0089] In other embodiments, a sealing groove 260 is also formed on the outer surface of the main valve sleeve 200, located between the oil inlet 220 and the pressure reducing port 210 along the axial direction of the valve core 300. It is understood that the sealing groove 260 provides a stable installation and positioning space for the sealing ring 400, preventing the sealing ring 400 from shifting or falling off during the axial movement of the valve core 300. After being radially compressed within the sealing groove 260, the sealing ring 400 can maintain a continuous sealing effect, and as the pressure increases, the sealing ring 400 will be further compressed and fitted, further improving the sealing effect and enhancing the sealing stability under high-pressure conditions. Simultaneously, the structural design of the sealing groove 260 can limit excessive deformation of the sealing ring 400, preventing accelerated wear of the sealing ring 400 due to frequent movement of the valve core 300, and extending the service life of the seal.

[0090] The pressure reducing valve also includes a sealing ring 400, which is fitted into the sealing groove 260. It is understood that the sealing ring 400 can form a radial sealing barrier on the outside of the main valve sleeve 200, directly cutting off the potential path for high-pressure oil to leak from the inlet port 220 to the pressure reducing port 210 through the fitting clearance. Simultaneously, the elastic deformation of the sealing ring 400 can tightly conform to the outer surface of the main valve sleeve 200 and the inner wall of the pipeline, effectively preventing cross-leakage of pressurized oil and ensuring pressure isolation between the high-pressure chamber and the low-pressure chamber.

[0091] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0093] The above description is merely an embodiment of this application and is not intended to limit 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 principle of this application should be included within the scope of the claims of this application.

[0094] 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. A pressure reducing valve, characterized in that, include: A valve body (100) having a valve cavity (100a); A main valve sleeve (200) is disposed in the valve body (100) and partially located in the valve cavity (100a). The main valve sleeve (200) has a pressure reducing port (210), an oil inlet (220), and a cavity (230) that are in communication. The cavity (230) includes a first cavity (231) and a second cavity (232) that are in communication with each other. The first cavity (231) is in communication with the oil inlet (220), and the second cavity (232) is in communication with the pressure reducing port (210). A valve core (300) is movably disposed in the cavity (230); Wherein, the outer diameter of the second cavity (232) is larger than the outer diameter of the first cavity (231) to form a first stepped surface (240). Along the axial direction of the valve core (300), the valve core (300) has a first end (310) located in the second cavity (232). The first end (310) has a first conical surface (311) facing the first stepped surface (240). The first conical surface (311) blocks or connects the first cavity (231) and the second cavity (232) by abutting or moving away from the inner circumference of the first stepped surface (240).

2. The pressure reducing valve according to claim 1, characterized in that, The outer peripheral surface of the valve core (300) is provided with a first groove (320). When the first conical surface (311) is far away from the inner peripheral edge of the first stepped surface (240), the first groove (320) communicates with the first cavity (231) and the second cavity (232) respectively.

3. The pressure reducing valve according to claim 2, characterized in that, Along the circumference of the valve core (300), the first groove (320) is constructed as an annular structure with the ends connected.

4. The pressure reducing valve according to claim 2, characterized in that, Along the axial direction of the valve core (300), the first conical surface (311) has a second end (311a) and a third end (311b). When the first conical surface (311) abuts against the inner circumference of the first stepped surface (240), the second end (311a) is located in the first cavity (231), and the third end (311b) is located in the second cavity (232).

5. The pressure reducing valve according to claim 3, characterized in that, Along the axial direction of the valve core (300), the first groove (320) has a fourth end (321) and a fifth end (322) disposed opposite to each other, the fourth end (321) being farther away from the first conical surface (311) than the fifth end (322), and the fourth end (321) having a second conical surface (323).

6. The pressure reducing valve according to claim 5, characterized in that, The inner peripheral wall of the first cavity (231) is provided with a second groove (250), which is arranged opposite to the oil inlet hole (220) along the radial direction of the valve core (300).

7. The pressure reducing valve according to claim 6, characterized in that, Along the circumference of the valve core (300), the second groove (250) is constructed as an annular structure with the ends connected.

8. The pressure reducing valve according to claim 6, characterized in that, Along the axial direction of the valve core (300), the second groove (250) and the second cavity (232) are spaced apart.

9. The pressure reducing valve according to claim 6, characterized in that, There are multiple oil inlet holes (220), and the multiple oil inlet holes (220) are arranged at intervals along the circumference of the main valve sleeve (200).

10. The pressure reducing valve according to claim 1, characterized in that, The outer surface of the main valve sleeve (200) is also provided with a sealing groove (260). Along the axial direction of the valve core (300), the sealing groove (260) is located between the oil inlet (220) and the pressure reducing port (210). The pressure reducing valve also includes a sealing ring (400), which is sleeved on the sealing groove (260).

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