Proportional pressure relief overflow valve

Abstract

The utility model belongs to hydraulic system technical field discloses proportional pressure reducing overflow valve. The slide valve core of proportional pressure reducing overflow valve is by the integrated molding of stem and valve core body, and the stem directly abuts with armature, has spared the push rod in traditional electromagnet assembly, makes armature can directly drive slide valve core to move in sliding chamber through stem, has reduced the number of parts, has reduced assembly difficulty, has simplified the structure of proportional pressure reducing overflow valve, has improved the smoothness and stability of slide valve core movement to the effective promotion of proportional pressure reducing overflow valve's regulating accuracy and response performance.

Description

Technical Field

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

[0002] Proportional pressure reducing relief valves are widely used in hydraulic control systems for precise regulation and stable control of system pressure. Existing proportional pressure reducing relief valves typically employ an electromagnet assembly consisting of an armature and a push rod. Electromagnetic force is transmitted via the push rod to the spool, causing it to move within the valve sleeve to adjust the pressure reduction or relief pressure. The push rod and spool are separate components, involving numerous assembly steps and a complex process. Assembly deviations can easily increase the sliding resistance of the spool, causing it to jam during operation.

[0003] Therefore, a proportional pressure reducing relief valve is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a proportional pressure reducing relief valve, which reduces the number of parts, lowers the assembly difficulty, simplifies the structure of the proportional pressure reducing relief valve, and improves the smoothness and stability of the valve core movement.

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

[0006] A proportional pressure reducing relief valve includes an electromagnet assembly, the electromagnet assembly including an armature, and the proportional pressure reducing relief valve further includes:

[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] The spool valve core includes an integrally formed rod and a valve core body. The rod slides through the first through hole and abuts against the armature. At least a portion of the valve core body slides against the inner wall of the sliding cavity. The valve core body is used to connect the first oil port with the second oil port or the third oil port.

[0010] Optionally, the valve core body has an axial oil passage and a circumferential groove. The bottom wall of the groove has a plurality of oil holes that communicate with 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 valve core body has a first boss and a second boss, both of which are slidably connected to the inner wall of the sliding cavity.

[0012] Optionally, the first boss portion and the second boss portion are respectively provided with pressure equalization grooves in the circumferential direction.

[0013] Optionally, at least two damping holes are provided at one end of the valve core body connected to the rod body, and the axes of the two damping holes gradually approach each other along the direction from the rod body to the valve core body;

[0014] The limiting seat, the valve sleeve, and the first boss together form a buffer cavity, and one end of the damping hole is connected to the buffer cavity, while the other end is connected to the oil passage.

[0015] Optionally, the bottom wall of the groove is provided with a plurality of elongated oil passage holes, which are spaced apart along the circumference of the valve core body.

[0016] Optionally, the first end of the valve sleeve is provided with a first groove along its axial direction, the sidewall of the first groove is provided with a plurality of first notches, and the outer wall of the valve sleeve is provided with an oil guide groove corresponding to the first notches, the oil guide groove being used to drain the oil in the electromagnet assembly.

[0017] Optionally, the limiting seat includes a seat body and a positioning part, the seat body is assembled inside the valve sleeve, and the positioning part abuts against the bottom of the first settling tank.

[0018] Optionally, the thickness of the positioning part is less than the depth of the first sink, and the positioning part is provided with a second sink on the side facing the electromagnet assembly. The sidewall of the second sink is provided with a second notch, and the second notch can be opposite to the first notch.

[0019] Optionally, the proportional pressure reducing relief valve further includes an elastic element. The valve core body is provided with a first limiting platform and a first annular portion at one end near the valve seat. The valve seat is provided with a second limiting platform and a second annular portion at one end facing the valve sleeve. One end of the elastic element is sleeved on the first annular portion and abuts against the first limiting platform, and the other end is sleeved on the second annular portion and abuts against the second limiting platform.

[0020] Beneficial effects:

[0021] The proportional pressure reducing relief valve provided by this utility model designs the valve core as an integral structure of the rod and the valve core body. The rod directly abuts against the armature, eliminating the push rod in the traditional electromagnet assembly. This allows the armature to directly drive the valve core to move in the sliding cavity through the rod, reducing the number of parts, lowering the assembly difficulty, simplifying the structure of the proportional pressure reducing relief valve, and improving the smoothness and stability of the valve core movement. This effectively improves the adjustment accuracy and response performance of the proportional pressure reducing relief valve. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the proportional pressure reducing overflow valve provided in a specific embodiment of this utility model;

[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 the proportional pressure reducing overflow valve provided in a specific embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the slide valve core provided in a specific embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the assembled slide valve core and valve assembly according to a specific embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram of the working principle of the proportional pressure reducing overflow valve provided in a specific embodiment of this utility model.

[0028] In the picture:

[0029] 10. Electromagnet assembly; 11. Armature; 12. Front yoke;

[0030] 100, Valve sleeve; 110, Sliding cavity; 120, Second oil port; 130, Third oil port; 140, Buffer cavity; 150, First settling groove; 151, First notch; 160, Oil guide groove;

[0031] 200, Valve seat; 210, First oil port; 220, Second limiting platform; 230, Second annular portion; 240, Third limiting platform;

[0032] 300, Limiting seat; 301, First through hole; 310, Seat body; 320, Positioning part; 321, Second recess; 322, Second notch;

[0033] 400. Spool valve core; 410. Rod body; 420. Valve core body; 421. Oil passage; 422. Groove; 423. Oil passage hole; 424. First boss; 425. Second boss; 426. Pressure equalizing groove; 427. Damping hole; 428. First limiting platform; 429. First annular part;

[0034] 500. Elastic components;

[0035] 600. Sealing components. 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 present 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, not the entire structure.

[0037] In the description of this utility model, 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 utility model 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 this utility model. In addition, the terms "first" and "second" are only used 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, which includes an armature 11. The proportional pressure reducing relief valve includes a valve sleeve 100, a valve seat 200, a limit seat 300, and a spool valve 400. The valve sleeve 100 and valve seat 200 have a first end located within the electromagnet assembly 10 and a second end located within the valve seat 200. The valve sleeve 100 has a sliding cavity 110. The valve seat 200 has an axial first oil port 210 and radial second oil ports 120 and 130. Port 120 and the third port 130 are spaced apart along the axial direction of the valve sleeve 100. The limiting seat 300 is provided at the first end of the valve sleeve 100. The limiting seat 300 is provided with a first through hole 301. The sliding valve core 400 includes an integrally formed rod 410 and a valve core body 420. The rod 410 slides through the first through hole 301 and abuts against the armature 11. At least part of the valve core body 420 slides and engages with the inner wall of the sliding cavity 110. The valve core body 420 is used to connect the first port 210 with the second port 120 or the third port 130. By designing the spool valve core 400 as an integral structure of the rod body 410 and the valve core body 420, with the rod body 410 directly abutting against the armature 11, the push rod in the traditional electromagnet assembly 10 is eliminated. This allows the armature 11 to directly drive the spool valve core 400 to move within the sliding cavity 110 via the rod body 410, reducing the number of parts, lowering the assembly difficulty, simplifying the structure of the proportional pressure reducing relief valve, and improving the smoothness and stability of the spool valve core 400's movement. This effectively enhances the adjustment accuracy and response performance of the proportional pressure reducing relief valve.

[0041] It should be noted that the rod body 410 is provided with a shaft section with a relatively large diameter. This shaft section is fitted with the first through hole 301 with a small clearance. That is, both the shaft section and the first through hole 301 are required to be smooth and have extremely high coaxiality. Furthermore, the diameter of this shaft section affects the pressure reduction of the proportional pressure reducing relief valve.

[0042] Optionally, such as Figures 2-3 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 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. This avoids 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 second valve core, the angles of the two shoulder angles of the groove 422 are both 69° jet angles.

[0043] Optionally, such as Figure 3As shown, the valve core body 420 has a first boss 424 and a second boss 425. Both the first boss 424 and the second boss 425 are slidably connected to the inner wall of the sliding cavity 110, which can effectively block the flow of oil in non-working oil passages. At the same time, it can provide multiple guiding supports during the axial movement of the spool valve core 400, so that it maintains good coaxiality in the sliding cavity 110, reduces offset and tilt, reduces frictional resistance, and avoids shaking or jamming under high pressure, thereby further improving the motion stability of the spool valve core 400 and the adjustment accuracy of the proportional pressure reducing relief valve.

[0044] Optionally, such as Figure 3 As shown, the first boss portion 424 and the second boss portion 425 are respectively provided with pressure equalization grooves 426 in the circumferential direction, which can realize the distribution and equalization of pressure during the axial movement of the valve core body 420, avoid the increase of frictional resistance or instantaneous adsorption caused by excessive local pressure, reduce sliding resistance, and further reduce the offset and vibration of the valve core body 420, so that it can maintain a smooth and stable movement trajectory under high pressure or fast response conditions, thereby effectively improving the control accuracy, stability and service life of the proportional pressure reducing relief valve.

[0045] Optionally, such as Figure 3 and Figure 4 As shown, at least two damping holes 427 are provided at the end where the valve core body 420 is connected to the rod body 410. Along the direction from the rod body 410 to the valve core body 420, the axes of the two damping holes 427 gradually approach each other. The limiting seat 300, the valve sleeve 100, and the first boss portion 424 together form a buffer cavity 140. One end of the damping hole 427 is connected to the buffer cavity 140, and the other end is connected to the oil passage 421. By gradually bringing the axes of the two damping holes 427 closer together along the direction from the rod body 410 to the valve core body 420, a damping flow channel with directional and gradual characteristics can be formed. This allows the oil to be throttled step by step during the reciprocating motion of the valve core, resulting in a smoother damping effect. This effectively buffers the valve core's moving speed and the impact at the end of its stroke, reduces noise generation, and improves control accuracy, response smoothness, and the service life of the spool valve core 400.

[0046] Optionally, such as Figure 4 As shown, the bottom wall of the groove 422 is provided with multiple elongated oval oil passage holes 423, which are spaced apart circumferentially along the valve core body 420. Compared with circular oil passage holes 423, the elongated oval oil passage holes 423 have a larger effective flow area and a more stable throttling boundary, which can reduce oil flow resistance, reduce eddies and pressure fluctuations, and maintain smooth oil flow when entering or leaving the groove 422. At the same time, the circumferentially spaced structure allows the groove 422 to achieve smooth oil passage at different angular positions, which is beneficial to maintaining the continuity and linear response of the valve core during high-speed or small-amplitude adjustment processes.

[0047] Optionally, such as Figure 5 As shown, one end of the valve sleeve 100 is rolled and connected to the front yoke 12. In order to ensure that the oil inside the electromagnet assembly 10 flows out smoothly, a first groove 150 is provided along its axial direction at the first end of the valve sleeve 100. The side wall of the first groove 150 is provided with a plurality of first notches 151. The outer wall of the valve sleeve 100 is provided with an oil guide groove 160 corresponding to the first notches 151. The oil guide groove 160 is used to guide the oil inside the electromagnet assembly 10, effectively avoiding the oil inside the electromagnet from stagnating or accumulating, improving the response speed and control accuracy of the electromagnet, and at the same time helping to extend the service life of the electromagnet assembly 10, and improving the overall performance and reliability of the proportional pressure reducing relief valve.

[0048] Optionally, the limiting seat 300 includes a seat body 310 and a positioning part 320. The limiting seat 300 includes a seat body 310 and a positioning part 320. The seat body 310 is assembled inside the valve sleeve 100 and the seat body and the valve sleeve 100 are in clearance fit. The positioning part 320 abuts against the bottom of the first settling groove 150, which improves the stability and reliability of the connection between the limiting seat 300 and the valve sleeve 100.

[0049] Optionally, the thickness of the positioning part 320 is less than the depth of the first sink 150, so that after the limiting seat 300 is assembled at the first end of the valve sleeve 100, a large gap is formed between the positioning part 320 of the limiting seat 300 and the electromagnet assembly 10, so that the oil and gas in the electromagnet assembly 10 can be smoothly discharged.

[0050] Optionally, such as Figure 5 As shown, the positioning part 320 is provided with a second sink 321 on the side facing the electromagnet assembly 10. The side wall of the second sink 321 is provided with a second notch 322. The second notch 322 can be opposite to the first notch 151 to improve the oil leakage efficiency inside the electromagnet assembly 10.

[0051] Optionally, such as Figure 3 As shown, the proportional pressure reducing relief valve also includes an elastic element 500. The second end of the valve core body 420 is provided with a first limiting platform 428 and a first annular portion 429. The valve seat 200, facing the valve sleeve 100, is provided with a second limiting platform 220 and a second annular portion 230. One end of the elastic element 500 is sleeved on the first annular portion 429 and abuts against the first limiting platform 428, while the other end is sleeved on the second annular portion 230 and abuts against the second limiting platform 220, ensuring the stable position of the elastic element 500 and improving reliable axial reset force. In this embodiment, the elastic element 500 is a reset spring, which has a simple structure, low cost, and high reliability. It can maintain stable elastic performance during long-term use, further improving the overall durability and adjustment accuracy of the proportional pressure reducing relief valve.

[0052] Optionally, the second end of the valve sleeve 100 is provided with an assembly groove, and the second limiting platform 220 is interference-fitted into the assembly groove to improve the stability of the connection between the valve seat 200 and the valve sleeve 100.

[0053] Optionally, the valve seat 200 also includes a third limiting platform 240. After the valve seat 200 is assembled, the third limiting platform 240 abuts against the end face of the second end of the valve sleeve 100, ensuring the stability of the valve seat 200 while improving the ease of assembly.

[0054] Optionally, the valve sleeve is provided with a sealing groove, and a sealing element 600 is provided in the sealing groove. The sealing element 600 is an O-ring, which can seal the connection between the valve sleeve and the valve body after the valve sleeve is installed in the valve body.

[0055] like Figure 6 The 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.

[0056] 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 400. When the electromagnet assembly 10 is not energized, the valve core 400 is offset to the left by the return spring, abutting against the push rod of the armature 11 assembly in the electromagnet assembly 10. This means the valve core 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 400 moves towards the valve seat 200 within the sliding cavity 110 of the valve sleeve 100, opening 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 400 moves to the left by the return spring, returning to its normal position.

[0057] 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 400 in the proportional pressure reducing relief valve is in its normal position when there is no electrical bias, 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.

[0058] 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 requires a proportional amplifier with current sensing and adjustable chatter functionality, and its PWM drive frequency must be between 120Hz and 269Hz.

[0059] For example, in this embodiment, the inlet pressure at port P is 35 bar, and the maximum working flow rate is 18 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.

[0060] Optionally, the electromagnet assembly 10 is a modular proportional electromagnet, comprising a plug assembly, a tail yoke assembly, a coil assembly, an armature 11, a front yoke 12, and a housing assembly. The electromagnet assembly 10 is packaged using a roll forming process, which improves the reliability and sealing of the overall structure. It should be noted that the plug assembly, tail yoke assembly, and coil assembly are all existing technologies, and their specific structures and working principles will not be described in detail.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A proportional pressure reducing relief valve, comprising an electromagnet assembly (10), said electromagnet assembly (10) including an armature (11), characterized in that, The proportional pressure reducing relief valve 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); The spool valve core (400) includes an integrally formed rod body (410) and a valve core body (420). The rod body (410) slides through the first through hole (301) and abuts against the armature (11). At least a portion of the valve core body (420) slides against the inner wall of the sliding cavity (110). The valve core body (420) is used to connect the first oil port (210) with the second oil port (120) or the third oil port (130).

2. The proportional pressure reducing relief valve according to claim 1, characterized in that, The valve core body (420) has an axial oil passage (421) and a circumferential groove (422). The bottom wall of the groove (422) has a plurality of oil 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).

3. The proportional pressure reducing relief valve according to claim 2, characterized in that, The valve core body (420) has a first boss (424) and a second boss (425), both of which are slidably connected to the inner wall of the sliding cavity (110).

4. The proportional pressure reducing relief valve according to claim 3, characterized in that, The first boss portion (424) and the second boss portion (425) are respectively provided with pressure equalization grooves (426) in the circumferential direction.

5. The proportional pressure reducing relief valve according to claim 3, characterized in that, The valve core body (420) is provided with at least two damping holes (427) at one end connected to the rod body (410). Along the direction from the rod body (410) to the valve core body (420), the axes of the two damping holes (427) gradually approach each other. The limiting seat (300), the valve sleeve (100), and the first boss (424) together form a buffer cavity (140). One end of the damping hole (427) is connected to the buffer cavity (140), and the other end is connected to the oil passage (421).

6. The proportional pressure reducing relief valve according to claim 2, characterized in that, The bottom wall of the groove (422) is provided with a plurality of elongated oil passage holes (423), which are spaced apart along the circumference of the valve core body (420).

7. The proportional pressure reducing relief valve according to claim 1, characterized in that, The first end of the valve sleeve (100) is provided with a first groove (150) along its axial direction. The side wall of the first groove (150) is provided with a plurality of first notches (151). The outer wall of the valve sleeve (100) is provided with an oil guide groove (160) corresponding to the first notches (151). The oil guide groove (160) is used to drain the oil in the electromagnet assembly (10).

8. The proportional pressure reducing relief valve according to claim 7, characterized in that, The limiting seat (300) includes a seat body (310) and a positioning part (320). The seat body (310) is assembled inside the valve sleeve (100), and the positioning part (320) abuts against the bottom of the first settling groove (150).

9. The proportional pressure reducing relief valve according to claim 8, characterized in that, The thickness of the positioning part (320) is less than the depth of the first sink (150), and the positioning part (320) is provided with a second sink (321) on the side facing the electromagnet assembly (10). The side wall of the second sink (321) is provided with a second notch (322), and the second notch (322) can be opposite to the first notch (151).

10. The proportional pressure reducing relief valve according to any one of claims 1-9, characterized in that, The proportional pressure reducing relief valve also includes an elastic element (500). The valve core body (420) is provided with a first limiting platform (428) and a first annular portion (429) at one end near the valve seat (200). The valve seat (200) is provided with a second limiting platform (220) and a second annular portion (230) at one end facing the valve sleeve (100). One end of the elastic element (500) is sleeved on the first annular portion (429) and abuts against the first limiting platform (428), and the other end is sleeved on the second annular portion (230) and abuts against the second limiting platform (220).

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