Pressure relief overflow valve and hydraulic system

Abstract

The utility model relates to pressure reducing overflow valve technical field discloses a pressure reducing overflow valve and hydraulic system, wherein, pressure reducing overflow valve includes valve body subassembly and valve plate subassembly, valve body subassembly has the first cavity and second cavity of intercommunication, and the cavity wall of first cavity is equipped with liquid inlet and pressure relief port, and pressure relief port is located at the one end of liquid inlet away from second cavity, valve plate subassembly includes the valve plate of first cavity's movable wear, and the clearance exists between the outside wall of valve plate and the inside wall of first cavity, and valve plate has at least two installation channels, and one elastic sealing mechanism is equipped in each installation channel, and elastic sealing mechanism includes at least two connecting blocks located respectively at the opposite ends of installation channel, at least two connecting blocks can elastically scalable setting, and can extend installation channel, to make the sealing surface of connecting block and the inside wall of first cavity abut. The utility model can improve the sealing compatibility of pressure reducing overflow valve.

Description

Technical Field

[0001] This utility model relates to the field of pressure-reducing relief valve technology, and in particular to a pressure-reducing relief valve and a hydraulic system. Background Technology

[0002] In related technologies, pressure-reducing relief valves are commonly used in hydraulic systems. They can adjust the position of the valve plate relative to the valve body according to the pressure at the outlet, thereby controlling the opening degree of the inlet and outlet by adjusting the position of the sealing surface of the valve plate relative to the inlet and outlet, thus realizing the pressure regulation function of the pressure-reducing relief valve.

[0003] In practical applications, due to factors such as mechanical vibration or temperature changes, there may be a small gap between the sealing surface of the valve plate and the valve body, which affects the sealing fit of this part of the area. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a pressure reducing relief valve and a hydraulic system, which aims to improve the sealing performance of the pressure reducing relief valve.

[0005] To achieve the above objectives, this utility model provides a pressure-reducing relief valve, comprising:

[0006] A valve body assembly having a first cavity and a second cavity communicating along a first direction; the first cavity has an inlet and a pressure relief port on its wall, with the pressure relief port located at the end of the inlet away from the second cavity in the first direction; the second cavity has an outlet on its wall; and the first direction and the second direction are perpendicular to each other.

[0007] A valve plate assembly includes a valve plate movably inserted through the first cavity. A gap exists between the outer wall of the valve plate and the inner wall of the first cavity. The valve plate has at least two mounting channels spaced apart in the first direction. The mounting channels extend through the valve plate in the second direction. Each mounting channel is provided with an elastic sealing mechanism. The elastic sealing mechanism includes at least two retractable connecting blocks. The two connecting blocks are located at opposite ends of the mounting channel. The opposite ends of the at least two connecting blocks have sealing surfaces. The at least two connecting blocks are elastically retractable in the second direction and can extend out of the mounting channel so that the sealing surfaces abut against the inner wall of the first cavity, thereby blocking the liquid inlet or the pressure relief port.

[0008] In one embodiment, the elastic sealing mechanism further includes an elastic element that extends along the second direction, with both ends of the elastic element connected to the two connecting blocks respectively, so as to drive the connecting blocks to extend toward both ends of the mounting channel.

[0009] In one embodiment, the connecting block has a connecting hole at one end facing the elastic member, and the two ends of the elastic member are respectively inserted into the two connecting holes.

[0010] In one embodiment, the connecting hole extends through the connecting block along the second direction, and the connecting hole includes:

[0011] The first hole is located at the end of the connecting block facing the elastic member, and the two ends of the elastic member are respectively inserted into the two first segments.

[0012] A second hole, located at the end of the first hole away from the elastic element, and communicating with the first hole; and

[0013] The third orifice is located at the end of the second orifice away from the first orifice and is connected to the second orifice. The end of the third orifice away from the second orifice extends to the sealing surface and is used to connect with the liquid inlet or the pressure relief port.

[0014] In one embodiment, the inner diameter of the third orifice is larger than the inner diameters of the liquid inlet and the pressure relief port.

[0015] In one embodiment, the outer walls of both connecting blocks are provided with sealing grooves, which are arranged around the circumference of the connecting blocks. The elastic sealing mechanism also includes two sealing elements, each of which is disposed in one of the sealing grooves and abuts against the inner wall of the installation channel.

[0016] In one embodiment, the valve body assembly has a liquid inlet channel communicating with the liquid inlet, the liquid inlet channel including a first segment and a second segment connected in a direction away from the liquid inlet, the inner diameter of the first segment being smaller than that of the second segment;

[0017] The valve body assembly has a pressure relief channel communicating with the pressure relief port. The pressure relief channel includes a third section and a fourth section that are connected in a direction away from the pressure relief port. The inner diameter of the third section is smaller than that of the fourth section.

[0018] In one embodiment, the liquid inlet and the pressure relief port are located on opposite sides of the first cavity in the second direction.

[0019] This utility model also proposes a hydraulic system, including a pressure regulating mechanism and a pressure reducing relief valve as described in any of the preceding claims. The pressure regulating mechanism is located at the end of the valve plate away from the second cavity and is used to provide a preset pressure to the valve plate.

[0020] In one embodiment, the pressure regulating mechanism is one of a spring pressure regulating mechanism, a hydraulic pressure regulating mechanism, and an electric pressure regulating mechanism.

[0021] This utility model provides a pressure-reducing relief valve and a hydraulic system, which have the following advantages compared with the prior art:

[0022] The pressure-reducing relief valve of this embodiment has two mounting channels formed within the valve plate, spaced apart along a first direction, corresponding to the inlet and pressure relief ports spaced apart along the first direction, respectively. Each mounting channel contains an elastic sealing mechanism. Since the two connecting blocks of the elastic sealing mechanism are retractably positioned at opposite ends of the mounting channel and can extend out of the channel under elastic force, the elastic force acts as a pre-tightening force to keep the sealing surface of the connecting blocks in constant contact with the inner wall of the first cavity of the valve body assembly. This helps compensate for minute gaps between the sealing surface and the valve body caused by mechanical vibration or temperature changes, thereby improving the sealing performance of the pressure-reducing relief valve. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the hydraulic system described in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the pressure-reducing relief valve described in an embodiment of the present invention;

[0025] Figure 3 This is a partial structural diagram of the pressure-reducing relief valve described in an embodiment of this utility model;

[0026] Figure 4 This is another structural schematic diagram of the hydraulic system described in this embodiment of the utility model;

[0027] Figure 5 This is another structural schematic diagram of the hydraulic system described in this utility model embodiment.

[0028] In the diagram, 1000 is the hydraulic system; 100 is the pressure-reducing relief valve; 10 is the valve body assembly; 11 is the first chamber; 111 is the inlet; 112 is the pressure relief port; 113 is the inlet channel; 1131 is the first section; 1132 is the second section; 114 is the pressure relief channel; 1141 is the third section; 1142 is the fourth section; 12 is the second chamber; 121 is the outlet; 20 is the valve plate assembly; and 21 is the valve. Plate; 211, Installation channel; 22, Elastic sealing mechanism; 221, Connecting block; 2211, Sealing surface; 2212, Connecting hole; 2212a, First hole body; 2212b, Second hole body; 2212c, Third hole body; 2213, Sealing groove; 222, Elastic element; 223, Sealing element; 200a, Spring pressure adjustment mechanism; 200b, Hydraulic pressure adjustment mechanism; 200c, Electric pressure adjustment mechanism. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] It should be understood that the terms "before" and "after" are used in this utility model to describe various types of information, but these terms should not be limited to them. These terms are only used to distinguish information of the same type from each other. For example, "before" information can also be called "after" information, and "after" information can also be called "before" information, without departing from the scope of this utility model.

[0031] like Figures 1 to 3As shown, a pressure-reducing relief valve 100 according to an embodiment of the present invention includes a valve body assembly 10 and a valve plate assembly 20. The valve body assembly 10 has a first cavity 11 and a second cavity 12 communicating along a first direction. The cavity wall of the first cavity 11 is provided with an inlet 111 and a pressure relief port 112, and the pressure relief port 112 is located at the end of the inlet 111 away from the second cavity 12 in the first direction. The cavity wall of the second cavity 12 is provided with an outlet 121. The first direction and the second direction are perpendicularly arranged. The valve plate assembly 20 includes a valve plate 21 that is movably inserted through the first cavity 11. There is a gap between the outer side wall of the valve plate 21 and the inner side wall of the first cavity 11. The valve plate 21 has at least Two installation channels 211 are spaced apart in the first direction. The installation channels 211 pass through the valve plate 21 in the second direction. Each installation channel 211 is provided with an elastic sealing mechanism 22. The elastic sealing mechanism 22 includes at least two telescopic connecting blocks 221. The at least two connecting blocks 221 are located at opposite ends of the installation channel 211. The opposite ends of the at least two connecting blocks 221 have sealing surfaces 2211. The at least two connecting blocks 221 are elastically telescopic in the second direction and can extend out of the installation channel 211 so that the sealing surfaces 2211 abut against the inner wall of the first cavity 11, thereby blocking the liquid inlet 111 or the pressure relief port 112.

[0032] The first cavity 11 has an inlet 111 and a pressure relief port 112 spaced apart in a first direction, while the second cavity 12 has an outlet 121. When the inlet 111 is open, it can accept high-pressure working medium from the hydraulic system 1000, allowing the working medium to enter the first cavity 11 through the inlet 111. The working medium can be, but is not limited to, an oil-based medium. After entering the first cavity 11, the working medium can further flow into the second cavity 12 through the gap between the valve plate 21 and the inner wall of the first cavity 11, and then output a depressurized working medium with a stable pressure through the outlet 121. When the pressure at the outlet 121 is too high, excess working medium can overflow through the pressure relief port 112 to maintain stable pressure at the outlet 121.

[0033] Furthermore, the valve plate 21 has two mounting channels 211 spaced apart in the first direction, and each mounting channel 211 is provided with an elastic sealing mechanism 22. Specifically, in this embodiment, the elastic sealing mechanism 22 includes two connecting blocks 221 spaced apart in the second direction, and each connecting block 221 is telescopically disposed at one end of the mounting channel 211. When one of the mounting channels 211 on the valve plate 21 and the elastic sealing mechanism 22 therein are arranged opposite to the liquid inlet 111 in the second direction, the sealing surface 2211 of the connecting block 221 of the elastic sealing mechanism 22 can abut against the cavity wall around the liquid inlet 111, thereby sealing the liquid inlet 111 through the elastic sealing mechanism 22 and preventing the working medium from entering the first cavity 11 through the liquid inlet 111. When the installation channel 211 and its internal elastic sealing mechanism 22 are misaligned with the inlet 111, the working medium at the inlet 111 can re-enter the first cavity 11 through the misalignment gap between the elastic sealing mechanism 22 and the inlet 111, and enter the second cavity 12 through the gap between the cavity wall of the first cavity 11 and the valve plate 21, and output the depressurized working medium through the outlet 121 of the second cavity 12 to realize the depressurization function of the pressure reducing overflow valve 100.

[0034] Similarly, when one of the mounting channels 211 on the valve plate 21 and its elastic sealing mechanism 22 are arranged opposite to the pressure relief port 112 in the second direction, the sealing surface 2211 of the connecting block 221 of the elastic sealing mechanism 22 can abut against the cavity wall around the pressure relief port 112, thereby sealing the pressure relief port 112 through the elastic sealing mechanism 22 and preventing the working medium from overflowing through the pressure relief port 112. When the mounting channel 211 and its elastic sealing mechanism 22 are misaligned with the pressure relief port 112, the working medium in the first cavity 11 can overflow through the pressure relief port 112 again through the misalignment gap between the elastic sealing mechanism 22 and the pressure relief port 112, so as to realize the overflow function of the pressure reducing relief valve 100.

[0035] Of course, the technical solution of this utility model is not limited to this. In other embodiments, the elastic sealing mechanism 22 may also include two or more connecting blocks 221. For example, one or more connecting blocks 21 may be provided at each end of the installation channel 211, and the sealing surfaces of multiple connecting blocks 21 can work together to seal the liquid inlet 111 or the pressure relief port 112. Specific implementation methods can be set according to actual needs and are not limited here.

[0036] It should be noted that in practical applications, due to factors such as mechanical vibration or temperature changes, there may be a small gap between the sealing surface 2211 of the valve plate assembly 20 and the valve body, which affects the sealing fit of this part of the area, causing the working medium of the pressure reducing relief valve 100 to easily leak at the mating surface of the two.

[0037] It is understandable that, since the two connecting blocks 221 of the elastic sealing mechanism 22 can be telescopically arranged at opposite ends of the mounting channel 211 and can extend out of the mounting channel 211 under the action of elastic force, the elastic force can be used as a pre-tightening force to drive the sealing surface 2211 of the connecting block 221 to a constant contact with the inner wall of the first cavity 11 of the valve body assembly 10. This is beneficial for the displacement compensation of the connecting block 221 under the action of elastic force in the small gap that may exist between the sealing surface 2211 and the inner wall of the first cavity 11, thereby improving the sealing fit of the pressure reducing relief valve 100.

[0038] Furthermore, in the technical solution of this utility model, since the sealing surface 2211 of the connecting block 221 is in constant contact with the inner wall of the first cavity 11 of the valve body assembly 10, the sealing fit between the two is good, so leakage of the working medium is unlikely to occur at the sealing surface 2211. If impurities are present in the working medium, and these impurities leak through the tiny gap between the sealing surface 2211 of the valve plate assembly 20 and the valve body, it will not only cause wear to the valve body and valve plate 21, but may also cause jamming or abnormal movement of the valve plate 21, thereby affecting the pressure regulating performance of the pressure reducing relief valve 100. Therefore, the technical solution of this utility model also helps to reduce the cleanliness requirements of the working medium for the pressure reducing relief valve 100.

[0039] like Figures 2 to 3 As shown, the elastic sealing mechanism 22 of this embodiment further includes an elastic element 222, which extends along a second direction. Both ends of the elastic element 222 are connected to two connecting blocks 221, respectively, to drive the connecting blocks 221 to extend towards both ends of the mounting channel 211. The elastic element 222 can be configured as a compression spring. When the connecting blocks 221 abut against the inner wall of the first cavity 11, the two connecting blocks 221 abut against both ends of the elastic element 222, causing it to contract under force, thereby accumulating elastic potential energy. Furthermore, the elastic element 222 can release this elastic potential energy to drive the two connecting blocks 221 to extend towards both ends of the mounting channel 211, thus compensating for the minute gap between the sealing surface 2211 and the inner wall of the first cavity 11 through its elastic expansion and contraction, thereby ensuring the sealing fit of the pressure-reducing overflow valve 100.

[0040] Of course, the technical solution of this utility model is not limited to this. In other embodiments, the elastic sealing mechanism 22 may also be provided with two elastic elements 222. One end of the two elastic elements 222 is located in the mounting channel 211, and the other end is connected to two connecting blocks 221 respectively, so as to drive the two connecting blocks 221 to extend to both ends of the mounting channel 211 respectively. The specific implementation can be set according to actual needs and is not limited here.

[0041] like Figures 2 to 3As shown, in this embodiment of the invention, the connecting block 221 has a connecting hole 2212 at one end facing the elastic member 222, and both ends of the elastic member 222 are respectively inserted into the two connecting holes 2212. This arrangement helps to improve the positional stability of the elastic member 222.

[0042] like Figures 2 to 3 As shown, in this embodiment of the present invention, the connecting hole 2212 is provided through the connecting block 221 along the second direction. The connecting hole 2212 includes a first hole body 2212a, a second hole body 2212b, and a third hole body 2212c that are connected to each other. The first hole body 2212a is located at one end of the connecting block 221 facing the elastic member 222. The two ends of the elastic member 222 are respectively inserted and engaged with two first segments 1131. The second hole body 2212b is located at one end of the first hole body 2212a away from the elastic member 222 and is connected to the first hole body 2212a. The third hole body 2212c is located at one end of the second hole body 2212b away from the first hole body 2212a and is connected to the second hole body 2212b. The end of the third hole body 2212c away from the second hole body 2212b extends to the sealing surface 2211 and is used to dock with the liquid inlet 111 or the pressure relief port 112. Specifically, in this embodiment, the inner diameter of the second hole 2212b can be smaller than the inner diameters of the first hole 2212a and the third hole 2212c. The end of the first hole 2212a facing the second hole 2212b can be formed with an inclined guide surface.

[0043] It is understandable that since the connecting hole 2212 is provided to pass through the connecting block 221 in the second direction, a channel for the working medium to flow can be formed by the connecting hole 2212 on the connecting block 221, which is conducive to increasing the flow rate of the working medium that can pass through the valve plate assembly 20, and thus conducive to increasing the output flow rate of the pressure reducing relief valve 100.

[0044] like Figures 2 to 3 As shown, the inner diameter of the third orifice 2212c in this embodiment of the present invention is larger than the inner diameters of the inlet 111 and the pressure relief port 112. With this configuration, when the connecting block 221 is positioned opposite the inlet 111 or the pressure relief port 112 along the second direction, it can be ensured that the projection of the third orifice 2212c onto the cavity wall of the first cavity 11 covers the inlet 111 or the pressure relief port 112 opened on the cavity wall of the first cavity 11. At this time, the sealing surface 2211 of the connecting block 221 can tightly cooperate with the cavity wall around the inlet 111 or the pressure relief port 112, thereby ensuring the sealing effect of the connecting block 221 on the inlet 111 or the pressure relief port 112.

[0045] like Figure 3As shown, in this embodiment of the invention, the outer walls of both connecting blocks 221 are provided with sealing grooves 2213. The sealing grooves 2213 are arranged around the circumference of the connecting blocks 221. The elastic sealing mechanism 22 also includes two sealing elements 223, each of which is correspondingly disposed in a sealing groove 2213 and abuts against the inner wall of the mounting channel 211. This arrangement helps to ensure the sealing fit between the connecting blocks 221 and the inner wall of the mounting channel 211.

[0046] In some embodiments, the seal 223 can be configured as a sealing ring. When the sealing ring is disposed in the sealing groove 2213, its top can protrude from the opening of the sealing groove 2213 so as to undergo elastic deformation under the pressure of the inner wall of the mounting channel 211, thereby filling the gap between the connecting block 221 and the mounting channel 211.

[0047] like Figures 2 to 3 As shown, the valve body assembly 10 of this utility model embodiment has an inlet channel 113 communicating with the inlet port 111. The inlet channel 113 includes a first segment 1131 and a second segment 1132 connected in a direction away from the inlet port 111. The inner diameter of the first segment 1131 is smaller than that of the second segment 1132. The valve body assembly 10 also has a pressure relief channel 114 communicating with the pressure relief port 112. The pressure relief channel 114 includes a third segment 1141 and a fourth segment 1142 connected in a direction away from the pressure relief port 112. The inner diameter of the third segment 1141 is smaller than that of the fourth segment 1142.

[0048] like Figures 1 to 3 As shown, in this embodiment of the present invention, the liquid inlet 111 and the pressure relief port 112 are located on opposite sides of the first cavity 11 in the second direction.

[0049] Specifically, in this embodiment, the valve body assembly 10 includes a valve body body, an inlet plunger, and a pressure relief plunger. A first cavity 11 and a second cavity 12 are formed within the valve body body. The first cavity 11 has a first mounting cavity and a second mounting cavity on opposite sides along a second direction, respectively. The inlet plunger and the pressure relief plunger are detachably disposed within the first and second mounting cavities and are sealed to the inner walls of the first and second mounting cavities. The inlet plunger and the pressure relief plunger each have an inlet channel 113 and a pressure relief channel 114. The inner end of the inlet channel 113 communicates with the first cavity 11 to form an inlet port 111, and the outer end of the inlet channel 113 is connected to an inlet / outlet flange. The inlet / outlet flange can also communicate with an outlet port 121 through an outlet channel. The inner end of the pressure relief channel 114 communicates with the first cavity 11 to form a pressure relief port 112, and the outer end of the pressure relief channel 114 is connected to a pressure relief flange.

[0050] In some embodiments, the distance between the inlet 111 and the pressure relief port 112 in the first direction is less than the distance between the two mounting channels 211 in the first direction. With this arrangement, when one mounting channel 211 and the elastic sealing mechanism 22 disposed within that mounting channel 211 are positioned opposite the inlet 111 in the second direction to block the inlet 111, the other mounting channel 211 and the elastic sealing mechanism 22 disposed within that other mounting channel 211 can be misaligned with the pressure relief port 112 in the first direction. This allows the area where the pressure relief port 112 is located to at least partially exceed the projection range of the connection hole 2212 of the other elastic sealing mechanism 22 on the cavity wall of the first cavity 11, thereby allowing the pressure inside the first cavity 11 to overflow and leak out through the pressure relief port 112.

[0051] This utility model also proposes a hydraulic system 1000, which includes a pressure regulating mechanism and a pressure reducing relief valve 100. The specific structure of the pressure reducing relief valve 100 is as described in the above embodiments. Since this hydraulic system 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The pressure regulating mechanism is located at the end of the valve plate 21 away from the second cavity 12, and is used to provide a preset pressure to the valve plate 21.

[0052] like Figure 1 As shown, the pressure regulating mechanism in this embodiment of the present invention is a spring pressure regulating mechanism 200a. Specifically, in this embodiment, the spring pressure regulating mechanism 200a includes a housing with one open end. The end of the valve plate 21 away from the second cavity 12 extends into the housing through the opening. The housing also includes a lower spring seat, an upper spring seat, a spring assembly, and an adjusting screw that abut against the valve body. The upper spring seat and the lower spring seat are spaced apart in a first direction. The spring assembly is connected between the upper spring seat and the lower spring seat. The adjusting screw abuts against the end of the upper spring seat away from the spring assembly and is threadedly connected to the housing. With this configuration, when the spring assembly located between the upper spring seat and the lower spring seat is in a compressed state, it can provide a preset pressure to the valve plate 21.

[0053] Furthermore, by rotating the adjusting screw in the forward direction, the upper spring seat can be driven to move the spring assembly towards the lower spring seat in the first direction, thereby increasing the preset pressure provided by the spring assembly to the valve plate 21. By rotating the adjusting screw in the reverse direction, the upper spring seat can be driven away from the lower spring seat, thereby reducing the deformation of the spring assembly and reducing the preset pressure provided by the spring assembly to the valve plate 21. It can be understood that the spring pressure regulating mechanism 200a can realize the pressure regulating function of the pressure regulating mechanism by mechanically adjusting the position of the adjusting screw and the upper spring seat by rotating them in the forward or reverse direction, making the pressure regulating mechanism highly convenient to operate.

[0054] like Figure 4 As shown, the pressure regulating mechanism in this embodiment of the present invention is a hydraulic pressure regulating mechanism 200b. Specifically, in this embodiment, the hydraulic pressure regulating mechanism 200b has a cylinder, a cylinder cover, and a piston. One end of the cylinder has an opening for the valve plate 21 to be inserted, and the other end is covered with a hydraulic cover, which has a regulating signal hydraulic port. The piston is located inside the cylinder and abuts against the end of the valve plate 21 away from the second cavity 12. The regulating signal hydraulic port can be connected to a signal fluid, and the hydraulic pressure of the cylinder and the hydraulic pressure of the valve body assembly 10 form a predetermined ratio so that the output pressure value at the outlet 121 of the valve body assembly 10 can be adjusted proportionally. For example, when the ratio of the hydraulic pressure of the cylinder to the hydraulic pressure of the valve body assembly 10 is 1:1, a pilot fluid of a certain pressure value is input through the regulating signal hydraulic port, and the outlet 121 of the pressure-reducing relief valve 100 can output a corresponding pressure value through pressure regulation. When the pilot fluid pressure input through the regulating signal hydraulic port is stable, the pressure output by the outlet 121 of the pressure-reducing relief valve 100 can also be relatively stable.

[0055] like Figure 5 As shown, the pressure regulating mechanism in this embodiment of the present invention is an electric pressure regulating mechanism 200c. Specifically, in this embodiment, the electric pressure regulating mechanism 200c can be driven to the end of the valve plate 21 away from the second cavity 12 via a servo electric cylinder, thereby providing a preset pressure to the valve plate 21 through the servo electric cylinder, and making the adjustment of the preset pressure have a faster response speed and control accuracy.

[0056] It is understood that the technical solution of this utility model, by making the pressure regulating mechanism and the pressure reducing relief valve 100 detachably connected, allows for multiple variations of the pressure regulating mechanism type of the hydraulic system 1000 according to usage requirements, thereby enabling the hydraulic system 1000 to meet application scenarios requiring different pressure accuracy.

[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A pressure-reducing relief valve (100), characterized in that, include: A valve body assembly (10) has a first cavity (11) and a second cavity (12) communicating along a first direction. The first cavity (11) has an inlet (111) and a pressure relief port (112) on its wall, and the pressure relief port (112) is located at the end of the inlet (111) away from the second cavity (12) in the first direction. The second cavity (12) has an outlet (121) on its wall. The first direction and the second direction are perpendicular to each other. A valve plate assembly (20) includes a valve plate (21) movably passing through the first cavity (11). A gap exists between the outer wall of the valve plate (21) and the inner wall of the first cavity (11). The valve plate (21) has at least two mounting channels (211) spaced apart in the first direction. The mounting channels (211) extend through the valve plate (21) in the second direction. Each mounting channel (211) is provided with an elastic sealing mechanism (22). 2) Includes at least two connecting blocks (221), the at least two connecting blocks (221) are respectively located at opposite ends of the mounting channel (211), the opposite ends of the at least two connecting blocks (221) have sealing surfaces (2211), the at least two connecting blocks (221) are elastically telescopically arranged along the second direction and can extend out of the mounting channel (211) so that the sealing surfaces (2211) abut against the inner sidewall of the first cavity (11), thereby blocking the liquid inlet (111) or the pressure relief port (112).

2. The pressure-reducing relief valve (100) according to claim 1, characterized in that, The elastic sealing mechanism (22) further includes an elastic element (222) that extends along the second direction. The two ends of the elastic element (222) are respectively connected to the two connecting blocks (221) to drive the connecting blocks (221) to extend toward the two ends of the mounting channel (211).

3. The pressure-reducing relief valve (100) according to claim 2, characterized in that, The connecting block (221) has a connecting hole (2212) at one end facing the elastic member (222), and the two ends of the elastic member (222) are respectively inserted into the two connecting holes (2212).

4. The pressure-reducing relief valve (100) according to claim 3, characterized in that, The connecting hole (2212) is provided through the connecting block (221) along the second direction, and the connecting hole (2212) includes: The first hole (2212a) is located at one end of the connecting block (221) facing the elastic member (222), and the two ends of the elastic member (222) are respectively inserted into the two first segments (1131); A second hole (2212b) is located at the end of the first hole (2212a) away from the elastic member (222) and communicates with the first hole (2212a); and The third orifice (2212c) is located at the end of the second orifice (2212b) away from the first orifice (2212a) and is connected to the second orifice (2212b). The end of the third orifice (2212c) away from the second orifice (2212b) extends to the sealing surface (2211) and is used to dock with the liquid inlet (111) or the pressure relief port (112).

5. The pressure-reducing relief valve (100) according to claim 4, characterized in that, The inner diameter of the third orifice (2212c) is larger than the inner diameters of the liquid inlet (111) and the pressure relief port (112).

6. The pressure-reducing relief valve (100) according to any one of claims 1 to 5, characterized in that, The outer walls of the two connecting blocks (221) are provided with sealing grooves (2213), which are arranged around the circumference of the connecting blocks (221). The elastic sealing mechanism (22) also includes two sealing elements (223), each of which is disposed in one of the sealing grooves (2213) and abuts against the inner wall of the installation channel (211).

7. The pressure-reducing relief valve (100) according to any one of claims 1 to 5, characterized in that, The valve body assembly (10) has an inlet channel (113) communicating with the inlet port (111). The inlet channel (113) includes a first section (1131) and a second section (1132) communicating in a direction away from the inlet port (111). The inner diameter of the first section (1131) is smaller than that of the second section (1132). The valve body assembly (10) has a pressure relief channel (114) communicating with the pressure relief port (112). The pressure relief channel (114) includes a third section (1141) and a fourth section (1142) communicating in a direction away from the pressure relief port (112). The inner diameter of the third section (1141) is smaller than that of the fourth section (1142).

8. The pressure-reducing relief valve (100) according to any one of claims 1 to 5, characterized in that, The liquid inlet (111) and the pressure relief port (112) are located on opposite sides of the first cavity (11) in the second direction.

9. A hydraulic system (1000), characterized in that, Includes a pressure regulating mechanism and a pressure reducing overflow valve (100) according to any one of claims 1 to 8, wherein the pressure regulating mechanism is located at one end of the valve plate (21) away from the second cavity (12) and is used to provide a preset pressure to the valve plate (21).

10. The hydraulic system (1000) according to claim 9, characterized in that, The pressure regulating mechanism is one of a spring pressure regulating mechanism (200a), a hydraulic pressure regulating mechanism (200b), and an electric pressure regulating mechanism (200c).

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