Proportional pressure relief overflow valve

Abstract

The application belongs to the technical field of hydraulic systems and discloses a proportional pressure-reducing overflow valve. The proportional pressure-reducing overflow valve is provided with a limiting seat at the first end of a valve sleeve. A slide valve core assembly is composed of a rod body and a valve core body. The rod body is in sliding fit with the limiting seat through a first through hole. The slide valve core adopts a split structure of the rod body and the valve core body. When the pressure-reducing pressure needs to be changed, only the diameter of the first through hole of the limiting seat and the outer diameter of the fitting part of the rod body and the first through hole need to be adjusted, that is, the rod body and the limiting seat are replaced, and the slide valve core assembly does not need to be replaced as a whole. The adjustment of the pressure-reducing pressure is more flexible and convenient, the adaptability of the proportional pressure-reducing overflow valve is significantly improved, and thus the manufacturing cost is effectively reduced and the maintenance efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and more particularly to a proportional pressure reducing relief valve. Background Technology

[0002] Proportional pressure reducing relief valves are widely used in hydraulic systems to achieve precise regulation and stable control of system pressure. However, in existing technologies, the spools used in proportional pressure reducing relief valves are mostly integral structures. When it is necessary to adjust the pressure reduction or relief pressure corresponding to the spool, it is often necessary to replace the entire spool. This not only leads to high maintenance costs but also a cumbersome replacement process. At the same time, the adjustment requirements for spool parameters vary under different operating conditions, and the integral replacement method makes it difficult to achieve rapid adaptation, which is not conducive to the flexible adjustment and application expansion of proportional pressure reducing relief valves.

[0003] Therefore, a proportional pressure reducing relief valve is urgently needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a proportional pressure reducing solenoid valve that allows for the replacement of the valve core assembly rod and limit seat according to actual working conditions, thereby improving the adaptability of the proportional pressure reducing relief valve, effectively reducing manufacturing costs, and improving maintenance efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A proportional pressure reducing relief valve, including an electromagnet assembly, further comprising:

[0007] A valve sleeve and a valve seat, wherein the first end of the valve sleeve is disposed in the electromagnet assembly, the second end of the valve sleeve is disposed in the valve seat, the valve sleeve is provided with a sliding cavity, the valve seat is provided with a first oil port in the axial direction, and the valve sleeve is provided with a second oil port and a third oil port in the radial direction, the second oil port and the third oil port being spaced apart along the axial direction of the valve sleeve;

[0008] A limiting seat is disposed at the first end of the valve sleeve, and a first through hole is provided on the limiting seat;

[0009] A spool valve assembly includes a rod and a valve core body. The rod slides through the first through hole and abuts against the output end of the electromagnet assembly. The other end is detachably connected to the valve core body. The end of the valve core body away from the rod is elastically connected to the valve seat. The valve core body is configured to connect the first oil port with the second oil port or the third oil port.

[0010] Optionally, the valve core body is provided with an oil passage in the axial direction, and the valve core body is provided with a groove in the circumferential direction. The bottom wall of the groove is provided with a plurality of oil holes that are respectively connected to the oil passage. The length of the groove in the axial direction of the valve core body is less than the minimum distance between the second oil port and the third oil port.

[0011] Optionally, the spool valve assembly further includes a first retaining ring. The end of the rod near the valve core body is provided with a first retaining groove and a first positioning part. The end of the valve core body near the rod is provided with an assembly hole communicating with the oil passage and a first positioning platform. The rod passes through the assembly hole. The first positioning part abuts against the first positioning platform. The first retaining ring is engaged in the first retaining groove. At least a portion of the first retaining ring protrudes radially from the rod body.

[0012] Optionally, the first positioning part is constructed as a conical structure, and the diameter of the conical structure gradually decreases from the rod to the valve core body.

[0013] Optionally, the valve core body has a first boss portion, which is located on the side of the groove near the rod body, and the first boss portion slides in cooperation with the inner wall of the sliding cavity;

[0014] The limiting seat, the valve sleeve, and the first boss together form a buffer cavity. The rod body is provided with a radial damping hole and an axial damping hole that are interconnected. The radial damping hole is connected to the buffer cavity, and the axial damping hole is connected to the oil passage.

[0015] Optionally, the first end of the valve sleeve is provided with a second through hole and a second positioning platform. The second through hole communicates with the sliding cavity. The limiting seat includes a seat body and a second positioning part. The seat body is assembled in the second through hole, and the second positioning part abuts against the second positioning platform.

[0016] Optionally, the inner wall of the second through hole is provided with a first sealing groove, and a first sealing element is provided in the first sealing groove. The first sealing element is embedded in the first sealing groove and is used to seal the connection between the limiting seat and the valve sleeve.

[0017] Optionally, the spool valve assembly further includes a second retaining ring, and a second retaining groove is provided at one end of the rod away from the valve core body. The second retaining ring is engaged in the second retaining groove, and at least a portion of the second retaining ring protrudes radially from the rod body.

[0018] Optionally, a flat portion is provided at the connection between the valve sleeve and the electromagnet assembly, and an oil passage gap is formed between the flat portion and the electromagnet assembly. The oil passage gap is configured to allow oil inside the electromagnet assembly to flow out.

[0019] Optionally, the proportional pressure reducing relief valve further includes an elastic element, a first mounting groove is provided at one end of the valve core body near the valve seat, a second mounting groove is provided on the valve seat, one end of the elastic element is mounted in the first mounting groove, and the other end is mounted in the second mounting groove.

[0020] Beneficial effects:

[0021] The proportional pressure reducing relief valve provided by this invention has a limiting seat at the first end of the valve sleeve. The spool valve core assembly consists of a rod and a valve core body. The rod slides and engages with the limiting seat through a first through hole. The spool valve core adopts a separate structure of the rod and the valve core body. When it is necessary to change the pressure reducing pressure, only the diameter of the first through hole of the limiting seat and the outer diameter of the mating part of the rod and the first through hole need to be adjusted, i.e., the rod and the limiting seat need to be replaced. There is no need to replace the entire spool valve core assembly, which makes the adjustment of the pressure reducing pressure more flexible and convenient, significantly improves the adaptability of the proportional pressure reducing relief valve, thereby effectively reducing manufacturing costs and improving maintenance efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the proportional pressure reducing solenoid valve provided in a specific embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Sectional view at point BB;

[0024] Figure 3 This is a cross-sectional view of a partial structure of a proportional pressure reducing solenoid valve provided in a specific embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the slide valve core assembly provided in a specific embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the working principle of the proportional pressure reducing overflow valve provided in a specific embodiment of the present invention.

[0027] In the picture:

[0028] 10. Electromagnet assembly; 11. Armature; 12. Push rod; 13. Front yoke;

[0029] 100. Valve sleeve; 110. Sliding cavity; 120. Second oil port; 130. Third oil port; 140. Second through hole; 141. First sealing groove; 142. First sealing element; 150. Second positioning platform; 160. First annular groove; 170. Second annular groove; 171. Guide slope; 180. Buffer cavity; 190. Flat part;

[0030] 200, Valve seat; 210, First oil port; 220, Second assembly groove; 230, I-shaped groove;

[0031] 300, Limiting seat; 301, First through hole; 310, Seat body; 320, Second positioning part;

[0032] 400. Spool valve assembly; 410. Rod body; 4101. Pressure equalizing groove; 411. First positioning part; 412. First slot; 413. Radial damping hole; 414. Axial damping hole; 415. Second slot; 420. Valve core body; 421. Oil passage; 422. Groove; 423. Oil passage hole; 424. First boss part; 425. First assembly groove; 426. Assembly hole; 427. First positioning platform; 430. First retaining ring; 440. Second retaining ring;

[0033] 500. Elastic components;

[0034] 600. Circular filter screen;

[0035] 700. Second seal. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] This embodiment provides a proportional pressure reducing relief valve, such as Figures 1-3 As shown, the proportional pressure reducing relief valve includes an electromagnet assembly 10, a valve sleeve 100, a valve seat 200, a limit seat 300, and a spool assembly 400. The first end of the valve sleeve 100 is disposed within the electromagnet assembly 10, and the second end is provided with the valve seat 200. A sliding cavity 110 is provided within the valve sleeve 100. The valve seat 200 has a first oil port 210 along its axial direction, and a second oil port 120 and a third oil port 130 along its radial direction. The second oil port 120 and the third oil port 130 are spaced apart along the axial direction of the valve sleeve 100. The spool assembly 400... The assembly 400 includes a rod 410 and a valve core body 420. A limiting seat 300 is disposed at the first end of the valve sleeve 100. The limiting seat 300 has a first through hole 301. The rod 410 slides through the first through hole 301 and abuts against the output end of the electromagnet assembly 10. The other end is detachably connected to the valve core body 420. The end of the valve core body 420 away from the rod 410 is elastically connected to the valve seat 200. The spool valve core body 420 is configured to connect the first oil port 210 with the second oil port 120 or the third oil port 130. When it is necessary to change the pressure reduction, only the diameter of the first through hole 301 of the limiting seat 300 and the outer diameter of the mating part of the rod 410 with the first through hole 301 need to be adjusted. That is, the rod 410 and the limiting seat 300 need to be replaced. There is no need to replace the entire spool valve core assembly 400, which makes the adjustment of the pressure reduction more flexible and convenient, significantly improves the adaptability of the proportional pressure reducing relief valve, thereby effectively reducing manufacturing costs and improving maintenance efficiency.

[0041] Optionally, such as Figure 2 and Figure 3 As shown, the valve core body 420 has an axial oil passage 421 and a circumferential groove 422. The bottom wall of the groove 422 has multiple oil passage holes 423 that communicate with the oil passage 421. The axial length of the groove 422 in the valve core body 420 is less than the minimum distance between the second oil port 120 and the third oil port 130. This prevents the second oil port 120 and the third oil port 130 from simultaneously communicating with the first oil port 210, fundamentally reducing the risk of high-pressure oil leaking to the low-pressure side, effectively preventing oil leakage, ensuring stable throttling, and improving the accuracy and reliability of system pressure control. In this embodiment, along the axial direction of the valve core body 420, both shoulder angles of the groove 422 are right-angled structures.

[0042] Optionally, such as Figure 3 and Figure 4 As shown, the spool valve assembly 400 also includes a first retaining ring 430. A first retaining groove 412 and a first positioning part 411 are spaced apart at one end of the rod 410 near the valve core body 420. An assembly hole 426 communicating with an oil passage 421 and a first positioning platform 427 are provided at one end of the valve core body 420 near the rod 410. The rod 410 passes through the assembly hole 426, and the first positioning part 411 abuts against the first positioning platform 427. The first retaining ring 430 is engaged in the first retaining groove 412, with at least a portion of the first retaining ring 430 protruding radially from the rod 410. The first retaining ring 430 and the first positioning part 411 axially confine the rod 410 to the valve core body 420, preventing relative displacement between the rod 410 and the valve core body 420, and ensuring the stability and reliability of the connection between the rod 410 and the valve core body 420. When replacing the rod 410, the rod 410 can be quickly separated from the valve core body 420 by removing the first retaining ring 430, which significantly improves the maintainability and disassembly efficiency of the spool valve core assembly 400.

[0043] In this embodiment, the first snap ring 430 is an E-type snap ring, and the rod body 410 and the valve core body 420 are connected by the E-type snap ring, thereby reducing the machining accuracy requirements of the rod body 410 and the valve core body 420 to a certain extent, simplifying the manufacturing process and improving the assembly convenience.

[0044] Optionally, the first positioning part 411 is constructed as a cone structure. The diameter of the cone structure gradually decreases from the rod 410 to the valve core body 420, which facilitates the smooth removal of the rod 410 from the valve core body 420 during disassembly, reduces the separation resistance between the two, and thus improves the convenience of the disassembly process and the maintenance efficiency.

[0045] Optionally, such as Figure 3 and Figure 4 As shown, the portion of the rod 410 that slides into the inner wall of the first through hole 301 is provided with at least one pressure equalizing groove 4101, which improves the smoothness of the rod 410's movement, enhances the response performance and pressure control accuracy of the proportional pressure reducing relief valve, and strengthens the stability and reliability of the hydraulic system. In this embodiment, two pressure equalizing grooves 4101 are provided in the portion of the rod 410 that slides into the inner wall of the first through hole 301. In other embodiments, three pressure equalizing grooves 4101, four pressure equalizing grooves 4101, etc., can be provided according to actual working conditions, and the number of pressure equalizing grooves 4101 is not specifically limited.

[0046] It is understandable that the shaft section with the pressure equalization groove 4101 on the rod body 410 is clearance-fitted with the first through hole 301. The diameter of this shaft section affects the pressure reduction of the proportional pressure reducing relief valve. Therefore, the pressure reduction of the proportional pressure reducing relief valve can be adjusted by replacing the rod body 410 and the limit seat 300.

[0047] Optionally, such as Figure 3 As shown, the valve core body 420 has a first boss 424, which is located on the side of the groove 422 near the rod 410. The first boss 424 slides in contact with the inner wall of the sliding cavity 110. The limiting seat 300, the valve sleeve 100, and the first boss 424 together form a buffer cavity 180. The rod 410 has a radial damping hole 413 and an axial damping hole 414 that are interconnected. The radial damping hole 413 is connected to the buffer cavity 180, and the axial damping hole 414 is connected to the oil passage 421. Through the above design, effective oil damping can be formed when the spool valve assembly 400 approaches and moves away from the limiting seat 300, which slows down the instantaneous speed change of the spool valve assembly 400, reduces impact force and vibration, thereby improving the smoothness of the movement of the spool valve assembly 400 and improving the response characteristics of the proportional electromagnetic control.

[0048] Optionally, the valve core body 420 is further provided with a second boss portion, which is spaced apart from the first boss portion 424 along the axial direction of the valve core body 420 to improve the stability of the valve core body 420 movement.

[0049] Optionally, the first end of the valve sleeve 100 is provided with a second through hole 140 and a second positioning platform 150. The second through hole 140 communicates with the sliding cavity 110. The limiting seat 300 includes a seat body 310 and a second positioning part 320. The seat body 310 is assembled in the second through hole 140, and the second positioning part 320 abuts against the second positioning platform 150 to ensure the stability of the limiting seat 300 during the reciprocating motion of the rod body 410 and the system pressure fluctuation process, and to prevent the limiting seat 300 from loosening and shifting, thereby improving the overall stability and reliability of the slide valve core assembly 400.

[0050] Optionally, such as Figure 3 As shown, the inner wall of the second through hole 140 is provided with a first sealing groove 141, and a first sealing element 142 is provided in the first sealing groove 141. The first sealing element 142 is embedded in the first sealing groove 141 and is used to seal the connection between the limit seat 300 and the valve sleeve 100. This design effectively prevents oil leakage from the mating surface between the limit seat 300 and the valve sleeve 100, reduces the risk of system oil leakage, and ensures that the spool valve assembly 400 can maintain a stable throttling state and precise pressure control under high pressure conditions, while improving the working efficiency and reliability of the hydraulic system. In this embodiment, the first sealing element 142 is an O-ring, which can achieve excellent sealing effect and effectively prevent oil leakage.

[0051] Optionally, such as Figure 3 As shown, the spool valve assembly 400 also includes a second retaining ring 440. A second retaining groove 415 is provided at the end of the rod 410 away from the valve core body 420, and the second retaining ring 440 is engaged in the second retaining groove 415. At least a portion of the second retaining ring 440 protrudes radially from the rod 410. In this embodiment, the limiting seat 300 can be assembled into the second through hole 140 from right to left. Therefore, when disassembling the rod 410, the limiting seat 300 can be pulled out from the second through hole 140 along with the rod 410 using the second retaining ring 440, thereby achieving convenient disassembly and assembly of the limiting seat 300 and improving the maintainability and ease of use of the proportional pressure reducing relief valve. In this embodiment, the second retaining ring 440 is an E-type retaining ring.

[0052] Optionally, such as Figure 1 As shown, a flat portion 190 is provided at the connection between the valve sleeve 100 and the electromagnet assembly 10. An oil passage gap is formed between the flat portion 190 and the electromagnet assembly 10. The oil passage gap is used to discharge the oil and gas inside the electromagnet assembly 10, effectively preventing oil and gas from stagnating or accumulating inside the electromagnet assembly 10, improving the response speed and control accuracy of the electromagnet assembly 10, and also helping to extend the service life of the electromagnet assembly 10, thereby improving the overall performance and reliability of the proportional pressure reducing relief valve.

[0053] Optionally, such as Figure 3 As shown, the proportional pressure reducing relief valve also includes an elastic element 500. The valve core body 420 has a first mounting groove 425 at one end near the valve seat 200, and the valve seat 200 has a second mounting groove 220. One end of the elastic element 500 is mounted in the first mounting groove 425, and the other end is mounted in the second mounting groove 220. When the electromagnet assembly 10 in the proportional pressure reducing relief valve no longer provides driving force to the spool valve assembly 400, the elastic element 500 can push the spool valve assembly 400 back to its initial position, thereby ensuring the reliability of the valve core movement and the repeatability of the positioning accuracy. In this embodiment, the elastic element 500 uses a return spring, which has a simple structure, low manufacturing cost, and provides a stable and reliable return force, further improving the reliability of the proportional pressure reducing relief valve.

[0054] Optionally, such as Figure 3 As shown, the valve sleeve 100 has a concentric first annular groove 160 and a second annular groove 170 on its outer periphery. The depth of the first annular groove 160 is greater than the depth of the second annular groove 170. The bottom of the first annular groove 160 is provided with a plurality of second oil ports 120. The second annular groove 170 is embedded with an annular filter screen 600, which can block impurities from entering the sliding cavity 110, reduce the risk of jamming, wear or blockage of the slide valve core assembly 400, and thus improve the reliability and life of the slide valve core assembly 400.

[0055] Optionally, such as Figure 3As shown, the valve sleeve 100 has a gradually rising guide slope 171 from the second end of the valve sleeve 100 to the first end of the valve sleeve 100, which facilitates the assembly of the annular filter screen 600 into the second annular groove 170 and improves the ease of assembly.

[0056] In this embodiment, a plurality of second oil ports 120 and a plurality of third oil ports 130 are provided along the circumference of the valve sleeve 100. For example, according to actual working conditions, the valve sleeve 100 is provided with 12 second oil ports 120 and 12 third oil ports 130 respectively along the circumference. Through this design, the uniform distribution and flow of oil in the valve sleeve 100 can be achieved.

[0057] Optionally, the valve core body 420 is provided with multiple oil passage holes 423. In this embodiment, according to actual working conditions, four circular oil passage holes 423 are provided, with the four circular oil passage holes 423 facing each other in pairs, which improves the stability and uniformity of oil passing through the valve core body 420. In other embodiments, the number of oil passage holes 423 can be set according to actual working conditions, and there is no specific limitation on the number of oil passage holes 423.

[0058] Optionally, the valve seat 200 is threaded to the second end of the valve sleeve 100, which improves the stability and reliability of the connection between the valve seat 200 and the valve sleeve 100 and facilitates the disassembly and assembly of the valve seat 200. In this embodiment, a slot 230 is provided at the end of the valve seat 200 away from the valve sleeve 100, which facilitates the disassembly and assembly of the valve seat 200 with tools such as screwdrivers, thus improving the convenience of disassembly and assembly.

[0059] Optionally, the first oil port 210 on the valve seat 200 is conical, which can increase the flow angle of the oil exiting the first oil port 210, thereby reducing the influence of steady-state hydrodynamic force and reducing the area gradient during outlet throttling, thus improving the stability of the outlet pressure of the proportional pressure reducing relief valve.

[0060] In other embodiments, the valve seat 200 is interference-fitted to the second end of the valve sleeve 100, which effectively prevents the valve seat 200 from loosening or slightly shifting under high pressure conditions, thereby improving the overall structural stability of the proportional pressure reducing relief valve. Furthermore, the interference-fitted structure of the valve seat at the second end of the valve sleeve is more compact, which helps reduce processing costs and improve assembly efficiency.

[0061] Optionally, the outer wall of the valve sleeve 100 is provided with two second sealing grooves, which are spaced apart along the axial direction of the valve sleeve 100. Each second sealing groove is fitted with a second sealing element 700, which seals the connection between the valve sleeve 100 and the valve body when the valve sleeve 100 is assembled into the valve body. In this embodiment, the second sealing element 700 is an O-ring.

[0062] like Figure 5The diagram shown is a schematic diagram of the working principle of the proportional pressure reducing relief valve provided in this embodiment, wherein port A is the first oil port 210, port P is the second oil port 120, and port T is the third oil port 130.

[0063] The proportional pressure reducing relief valve relies on the electromagnetic force generated by the electromagnet assembly 10 to control the position of the valve core. When the electromagnet assembly 10 is not energized, the valve core assembly 400 is biased towards the side closer to the electromagnet assembly 10 under the spring force of the return spring, and abuts against the push rod 12 of the armature assembly in the electromagnet assembly 10. That is, the valve core assembly 400 is in its normal position, the oil passage from port P to port A is closed, and the oil passage from port A to port T is open, thus achieving the relief function. When the electromagnet assembly 10 is energized, the valve core assembly 400 moves the valve seat 200 within the sliding cavity 110 of the valve sleeve 100 to open the oil passage from port P to port A, thus achieving the pressure reducing function. When the electromagnet assembly 10 is de-energized, the electromagnetic force disappears, and the valve core assembly 400 moves towards the side closer to the electromagnet assembly 10 under the spring force of the return spring, thus returning to its normal position.

[0064] For example, the proportional pressure reducing relief valve is an electro-proportional direct-acting structure. Its function is to proportionally adjust the high-pressure main oil circuit pressure at the inlet P port to the required pressure reduction pressure at the inlet A port, and it has a full-flow relief function from the inlet A port to the outlet T port. Specifically, the spool valve assembly 400 in the proportional pressure reducing relief valve is in its normal position when it is in a non-electrically biased state, and the proportional pressure reducing relief valve operates in relief mode. When the electromagnet assembly 10 is energized, the inlet P port and the outlet A port are connected. As the coil current increases, the pressure reduction pressure at the outlet A port increases proportionally. When the pressure at the outlet A port exceeds the set pressure corresponding to the electromagnetic force of the coil, the oil will overflow from the outlet A port to the outlet T port, and the proportional pressure reducing relief valve switches to relief mode.

[0065] This proportional pressure reducing relief valve is in a closed state during the transition between pressure reducing mode and relief mode, resulting in low internal leakage and improved pressure control accuracy and system efficiency. For optimal control performance, the proportional pressure reducing relief valve must be used with a proportional amplifier that features current sensing and adjustable chatter, and its PWM drive frequency is preferably 120Hz.

[0066] For example, in this instance, the inlet pressure at port P is 50 bar, and the maximum working flow rate is 10 L / min. In other embodiments, the inlet pressure and maximum flow rate at port P can be adjusted appropriately according to specific application requirements to adapt to the working conditions of different hydraulic systems.

[0067] Optionally, the electromagnet assembly 10 is a modular proportional electromagnet, comprising a plug assembly, a tail ferrule assembly, a coil assembly, an armature assembly, and a housing assembly. The electromagnet assembly 10 is packaged using a roll forming process, which improves the overall structural reliability and sealing. It should be noted that the plug assembly, tail ferrule assembly, and coil assembly are all existing technologies, and their specific structures and working principles will not be elaborated upon.

[0068] Optionally, the housing assembly includes a housing and a front yoke 13. One end of the housing is provided with a tail assembly, and the other end is provided with a front yoke 13. The housing is provided with a coil assembly and an armature assembly. The first end of the valve sleeve 100 is fitted inside the front yoke 13. An oil passage gap is formed between the flat portion 190 on the valve sleeve 100 and the front yoke 13 to facilitate the discharge of oil and gas in the electromagnet assembly 10.

[0069] Optionally, the armature assembly includes an armature 11 and a push rod 12. One end of the push rod 12 is connected to the armature 11, and the other end abuts against the rod 410 of the spool valve core assembly 400. By driving the armature 11 and the push rod 12 to move through the coil assembly, the spool valve core assembly 400 can be pushed to switch from the overflow mode to the pressure reducing mode. After the coil assembly no longer provides magnetic force, the armature 11 and the push rod 12 are reset. At this time, the spool valve core assembly 400 is reset under the action of the elastic element 500, and the proportional pressure reducing overflow valve switches from the pressure reducing mode to the overflow mode.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A proportional pressure reducing relief valve, comprising an electromagnet assembly (10), characterized in that, The proportional pressure reducing relief valve also includes: A valve sleeve (100) and a valve seat (200) are provided. The first end of the valve sleeve (100) is disposed in the electromagnet assembly (10), and the second end is provided with the valve seat (200). A sliding cavity (110) is provided in the valve sleeve (100). A first oil port (210) is provided in the axial direction of the valve seat (200). A second oil port (120) and a third oil port (130) are provided in the radial direction of the valve sleeve (100). The second oil port (120) and the third oil port (130) are spaced apart along the axial direction of the valve sleeve (100). A limiting seat (300) is provided at the first end of the valve sleeve (100), and a first through hole (301) is provided on the limiting seat (300); A spool valve assembly (400) includes a rod (410) and a valve core body (420). The rod (410) is slidably inserted through the first through hole (301) and abuts against the output end of the electromagnet assembly (10). The other end is detachably connected to the valve core body (420). The end of the valve core body (420) away from the rod (410) is elastically connected to the valve seat (200). The valve core body (420) is configured to communicate between the first oil port (210) and the second oil port (120) or the third oil port (130). The valve core body (420) is provided with an oil passage (421) in the axial direction, and the valve core body (420) is provided with a groove (422) in the circumferential direction. The bottom wall of the groove (422) is provided with a plurality of oil passage holes (423) that are respectively connected to the oil passage (421). The length of the groove (422) in the axial direction of the valve core body (420) is less than the minimum distance between the second oil port (120) and the third oil port (130). The valve core assembly (400) further includes a first retaining ring (430). The rod (410) is provided with a first retaining groove (412) and a first positioning part (411) at one end near the valve core body (420). The valve core body (420) is provided with an assembly hole (426) and a first positioning platform (427) communicating with the oil passage (421) at one end near the rod (410). The rod (410) passes through the assembly hole (426). The first positioning part (411) abuts against the first positioning platform (427). The first retaining ring (430) is engaged in the first retaining groove (412). At least a portion of the first retaining ring (430) protrudes radially from the rod (410). The valve core body (420) has a first boss (424), which is located on the side of the groove (422) near the rod (410), and the first boss (424) slides in cooperation with the inner wall of the sliding cavity (110). The limiting seat (300), the valve sleeve (100), and the first boss (424) together form a buffer cavity (180). The rod body (410) is provided with a radial damping hole (413) and an axial damping hole (414) that are interconnected. The radial damping hole (413) is connected to the buffer cavity (180), and the axial damping hole (414) is connected to the oil passage (421).

2. The proportional pressure reducing relief valve according to claim 1, characterized in that, The first positioning part (411) is constructed as a cone structure, and the diameter of the cone structure gradually decreases from the rod (410) to the valve core body (420).

3. The proportional pressure reducing relief valve according to claim 1, characterized in that, The valve sleeve (100) has a second through hole (140) and a second positioning platform (150) at its first end. The second through hole (140) communicates with the sliding cavity (110). The limiting seat (300) includes a seat body (310) and a second positioning part (320). The seat body (310) is assembled in the second through hole (140), and the second positioning part (320) abuts against the second positioning platform (150).

4. The proportional pressure reducing relief valve according to claim 3, characterized in that, The inner wall of the second through hole (140) is provided with a first sealing groove (141), and a first sealing element (142) is provided in the first sealing groove (141). The first sealing element (142) is embedded in the first sealing groove (141) and is used to seal the connection between the limiting seat (300) and the valve sleeve (100).

5. The proportional pressure reducing relief valve according to claim 1, characterized in that, The valve core assembly (400) further includes a second retaining ring (440). The end of the rod (410) away from the valve core body (420) is provided with a second retaining groove (415). The second retaining ring (440) is engaged in the second retaining groove (415). At least a portion of the second retaining ring (440) protrudes radially from the rod (410).

6. The proportional pressure reducing relief valve according to claim 1, characterized in that, A flat portion (190) is provided at the connection between the valve sleeve (100) and the electromagnet assembly (10), and an oil passage gap is formed between the flat portion (190) and the electromagnet assembly (10). The oil passage gap is configured to allow the oil inside the electromagnet assembly (10) to flow out.

7. The proportional pressure reducing relief valve according to claim 1, characterized in that, The proportional pressure reducing relief valve also includes an elastic element (500). The valve core body (420) has a first mounting groove (425) at one end near the valve seat (200). The valve seat (200) has a second mounting groove (220). One end of the elastic element (500) is mounted in the first mounting groove (425), and the other end is mounted in the second mounting groove (220).

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