Proportional solenoid valve

Abstract

The utility model relates to a proportional solenoid valve, including lower pole plate, armature, jackscrew, valve core, be used for driving the elastic part of valve core reset, lower pole plate is equipped with the first axial through hole that jackscrew passes through, armature is axially displaced under the electromagnetic action to push jackscrew and push valve core, armature is equipped with the armature exhaust hole that penetrates axially, the upper end of jackscrew is equipped with jackscrew flange, jackscrew flange is equipped with a plurality of gas guide groove, and the outer peripheral wall of jackscrew is equipped with exhaust groove, and exhaust groove is connected armature exhaust hole through gas guide groove, the lower end of first axial through hole is formed and expands into the damping groove, when valve core moves to the maximum stroke along the axially upwards, the upper end surface of valve core touches the lower end surface of lower pole plate and does not enter the damping groove, when jackscrew and valve core move axially, armature exhaust hole, gas guide groove, exhaust groove, damping groove can exhaust in time, make jackscrew steady movement, when valve core reset moves, will make hydraulic oil impact lower pole plate and jackscrew, at this moment, damping groove buffers concussion, reduces the interference of hydraulic oil to jackscrew.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, specifically to a proportional solenoid valve. Background Technology

[0002] As a core actuator in automotive electro-hydraulic control systems, proportional pressure solenoid valves (proportional solenoid valves) precisely regulate the pressure or flow rate of fluids (oil, gas, or fuel) through linear changes in input current, directly affecting vehicle power transmission, braking safety, and energy efficiency.

[0003] A proportional solenoid valve typically includes an electromagnetic drive assembly and a pressure regulating assembly. The electromagnetic drive assembly includes an upper electrode plate, a lower electrode plate, an armature, and a coil. The pressure regulating assembly includes a valve sleeve and a valve core. When the coil is energized, it generates a magnetic field. Under the action of the magnetic field, the upper and lower electrode plates form a closed magnetic circuit, guiding the magnetic field to concentrate through the armature. The armature (usually made of ferromagnetic material) is subjected to electromagnetic force, resulting in axial displacement, which directly or indirectly drives the valve core to move relative to the valve sleeve, thereby changing the opening degree of the fluid inlet and outlet and realizing proportional flow / pressure control.

[0004] In the prior art, the electromagnetic drive assembly typically includes a push rod driven by the armature. The movement of the armature causes the push rod to push the valve core to move, thereby achieving pressure regulation. For example, a proportional solenoid valve and its pressure regulating device are disclosed in Chinese Invention Application (Publication No. CN116771950A). In this type of solution, the armature drives the push rod to push the valve core downward, and the valve core is pushed upward by a return spring to return to its original position. The elastic force of the spring on the push rod and the thrust of the armature on the push rod are relatively antagonistic. During the movement of the push rod, it may be disturbed by hydraulic oil or gas, affecting the stability of the push rod movement. The stability of the push rod movement is related to the stability of the valve core movement and directly affects the control accuracy of the proportional valve. Therefore, in order to improve the stability of the push rod, the applicant has improved the drive module of the proportional solenoid valve. Utility Model Content

[0005] The purpose of this invention is to develop a proportional solenoid valve to solve the problem that the push rod in the magnetic drive module of existing proportional valves is easily affected by hydraulic oil or airflow interference, thereby improving the stability of the push rod movement and ensuring the control accuracy of the proportional valve. This invention is achieved through the following technical solution: A proportional solenoid valve includes an upper electrode plate, a lower electrode plate, an armature, a coil, a push rod, a valve sleeve, and a valve core located within the valve sleeve, and an elastic element that maintains the valve core's tendency to move towards the lower electrode plate. The push rod and the lower electrode plate are located between the armature and the valve core. The lower electrode plate has a first axial through hole through which the push rod passes. The armature is axially displaced under electromagnetic action to push the push rod to move axially relative to the lower electrode plate and push against the valve core, causing the valve core to move axially relative to the valve sleeve. The armature has an axially penetrating armature vent hole. The upper end of the push rod has a... The armature drive is fitted with a push rod flange, which has several air guide grooves. The outer peripheral wall of the push rod has several axially extending exhaust grooves, which are connected to the armature exhaust port through the air guide grooves. The lower end of the first axial through hole expands outward to form a damping groove. The axial projection of the groove opening on the lower end face of the lower electrode plate is at least partially offset from the axial projection of the upper end face of the valve core, so that when the valve core moves upward along the axial direction to its maximum stroke, the upper end face of the valve core abuts against the lower end face of the lower electrode plate without entering the damping groove.

[0006] The beneficial effects of the above technical solution are as follows: Under the action of the armature and elastic element, when the push rod and valve core move axially, the armature exhaust port connects to the valve core through the air guide groove, exhaust groove, and damping groove, which can quickly and timely guide and exhaust air, avoiding the gas being compressed and causing resistance to the push rod or interfering with the stable movement of the push rod; at the same time, when the valve core moves upward along the axial direction to reset, the hydraulic oil between the valve core and the push rod impacts the lower plate and the push rod. At this time, the oil will diffuse into the damping groove, and the damping groove plays a role in buffering the oscillation, reducing the interference of hydraulic oil on the movement of the push rod.

[0007] In one possible implementation, the lower end of the lower electrode plate is sealed to the upper end of the valve sleeve. The upper end of the valve sleeve has a dirt-collecting groove, and the upper end of the valve core passes through the dirt-collecting groove to approach the lower end of the push rod. The inner diameter of the dirt-collecting groove is larger than the diameter of the upper end of the valve core. The dirt-collecting groove and the damping groove together form a cavity containing hydraulic oil. Under the action of the armature and the elastic element, the lower end of the push rod and the upper end of the valve core slide axially within the cavity. The hydraulic oil contained in the cavity provides lubrication and protection. Simultaneously, the hydraulic oil carries away dirt and wear particles. The dirt-collecting groove can accommodate dirt and wear particles, preventing them from entering the first axial through hole and affecting the axial movement of the push rod.

[0008] In one possible implementation, the air guide groove is disposed on the upper surface of the push rod flange and forms a notch on the outer peripheral wall of the push rod flange. The air guide groove communicates with the exhaust groove through an air guide hole penetrating the push rod flange, allowing the airflow in the exhaust groove to flow through the air guide hole into the air guide groove. Part of the airflow escapes to the outer periphery of the push rod flange, while the other part enters the armature exhaust port. In one possible implementation, the upper surface of the lower electrode plate is provided with a first recessed groove, and the bottom surface of the first groove is provided with a second recessed groove. The recess depth of the second groove relative to the bottom surface of the first groove is h. The first and second grooves are coaxially arranged with the first axial through hole and combined in a stepped shape. When the armature moves axially downward, the lower end of the armature is radially limited within the first groove. The thickness of the push rod flange is a, and a > h. When the armature pushes the push rod and moves axially downward to its maximum stroke, the push rod flange is radially limited within the second groove and abuts against the bottom surface of the second groove. The lower end of the armature is clearance-fitted with the bottom surface of the first groove, so that the armature does not contact the lower electrode plate when it moves downward to its maximum stroke. When the axial length of the solenoid valve drive assembly is the same, compared with the push rod flange directly abutting the upper surface of the lower electrode plate at its maximum stroke, this solution allows the push rod to have a larger stroke range, the structure of the drive assembly to be more compact, and it has a greater electromagnetic force.

[0009] In one possible implementation, the armature is fitted with a bushing, and the armature is axially displaced relative to the bushing under electromagnetic action. The top of the bushing is provided with a bushing protrusion protruding towards the armature. When the armature moves upward axially to its maximum stroke, the top surface of the armature abuts against the bushing protrusion. The bushing protrusion limits the upward stroke of the armature and reduces the contact area between the armature and the bushing, thereby giving the solenoid valve a faster response time.

[0010] In one possible implementation, the upper electrode plate, lower electrode plate, armature, coil, and push rod are all installed inside the housing of the proportional solenoid valve. The upper end of the housing is connected to a wiring terminal and an integrally formed terminal protective sleeve. The valve sleeve and valve core are located at the lower end of the housing. The housing includes an axially extending sleeve portion and a constricted portion connected to the upper end of the sleeve portion, which is radially bent inward relative to the sleeve portion. The constricted portion has a wiring opening. The lower end of the terminal protective sleeve is confined within the housing, and the upper end of the terminal protective sleeve and the wiring terminal extend upward beyond the wiring opening. A first annular groove is provided on the outer periphery of the lower end of the terminal protective sleeve. A first sealing ring is provided between the first annular groove and the inner wall of the housing, and the first sealing ring is located at the angle between the sleeve portion and the constricted portion. The wiring terminal of the solenoid valve and the terminal protective sleeve are integrally injection molded, resulting in better sealing performance and preventing hydraulic oil leakage.

[0011] In one possible implementation, the armature is fitted with a bushing; the upper and lower electrode plates are separately disposed, the upper electrode plate includes a second cylindrical portion and a second flange portion connected to the outer periphery of the second cylindrical portion, the second cylindrical portion having a second axial through hole for the armature and bushing to pass through, the lower electrode plate includes a first cylindrical portion having a first axial through hole and a first flange portion connected to the outer periphery of the first cylindrical portion; the coil is located on the outer periphery of the first and second cylindrical portions and axially confined between the first and second flange portions; the armature is axially displaced relative to the bushing under electromagnetic action, and the upper and lower electrode plates are axially positioned relative to the bushing; the separate upper and lower electrode plates result in a simpler structure, easier production, and higher economic efficiency; the armature surface has an anti-wear coating, which, together with the bushing, plays a role in anti-wear and extending the armature life, while the bushing provides good corrosion protection and sealing.

[0012] Furthermore, the bushing extends downwards between the first flange and the coil, and a second sealing ring is provided between the lower electrode plate and the bushing, with the second sealing ring located at the angle between the first cylindrical portion and the first flange. This seals the hydraulic oil inside the solenoid valve, preventing leakage.

[0013] Furthermore, the bushing, upper electrode plate, lower electrode plate, armature, coil, and push rod are all installed inside the housing of the proportional solenoid valve. The first flange is located at the lower opening of the housing, and a second annular groove is provided on the outer periphery of the first flange. A second sealing ring is provided between the second annular groove and the inner wall of the housing. This further prevents hydraulic oil leakage.

[0014] Furthermore, the lower opening of the housing is connected to a mounting portion extending radially outward from the housing. The mounting portion is used for positioning and connecting with the assembly plane of the proportional solenoid valve. The lower end face of the lower electrode plate protrudes axially from the lower end face of the mounting portion. The "assembly plane" can be the valve plate of the solenoid valve or other similar structures, used to seal and position the solenoid valve housing. The lower electrode plate protrudes slightly axially from the lower end face of the housing (the lower end face of the housing is the mating surface between the housing and the assembly plane). Bolts pass through screw holes to connect the housing and the mounting plane. After tightening, the proportional solenoid valve is fixed on the assembly plane (valve plate) without shaking. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of the proportional solenoid valve provided by this utility model; Figure 2 for Figure 1 A cross-sectional view of the solenoid valve. Figure 3 for Figure 1 A schematic diagram of the push rod structure of a solenoid valve; Figure 4for Figure 3 Another angle diagram of the top rod structure; Figure 5 for Figure 2 A schematic diagram of the assembly structure of the central armature, the push rod, and the lower electrode plate; Figure 6 for Figure 5 A schematic diagram showing the interaction between the center push rod and the lower electrode plate when the rod moves downward to its maximum stroke. Figure 7 for Figure 1 A schematic diagram of the lower electrode plate of the solenoid valve; Figure 8 for Figure 7 Cross-sectional view of the lower and middle electrodes; Figure 9 for Figure 2 Schematic diagram of the middle bushing structure.

[0016] In the diagram, 1. Terminal protective sleeve; 11. Wiring terminal; 2. Housing; 21. First sealing ring; 22. Screw hole; 23. Closure portion; 3. Bushing; 31. Second sealing ring; 32. Bushing protrusion; 41. Upper electrode plate; 411. Second flange portion; 42. Lower electrode plate; 421. First axial through hole; 422. First notch; 423. Second notch; 424. Damping groove; 425. Extension sleeve; 426. First cylindrical portion; 427. First flange portion; 43. Armature; 431. Armature vent; 44. Coil; 5. Push rod; 51. Push rod flange; 511. Air guide groove; 512. Air guide hole; 52. Vent groove; 6. Adjustment assembly; 61. Valve sleeve; 611. Valve sleeve sealing ring; 62. Valve core; 63. Scrubber groove; 64. Elastic element. Detailed Implementation

[0017] First, those skilled in the art should understand that the following embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0018] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0019] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] To make the objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 9 As shown, this embodiment provides a proportional solenoid valve, including an electromagnetic drive assembly and a pressure regulating assembly 6. The electromagnetic drive assembly includes a cooperating upper electrode plate 41, a lower electrode plate 42, an armature 43, a coil 44, and a push rod 5. The pressure regulating assembly 6 includes a valve sleeve 61, a valve core 62 located within the valve sleeve 61, and an elastic element 64 (reset spring) for driving the valve core 62 towards the lower electrode plate 42 for resetting. The push rod 5 and the lower electrode plate 42 are located between the armature 43 and the valve core 62. The lower electrode plate 42 has a first axial through hole 421 through which the push rod 5 passes. The armature 43 is axially displaced under electromagnetic action to push the push rod 5 axially relative to the lower electrode plate 42 and push against the valve core 62, causing the valve core 62 to axially displace relative to the valve sleeve 61. The armature 43 is provided with an axially penetrating armature exhaust port 431. The upper end of the push rod 5 is provided with a push rod flange 51 that is in transmission cooperation with the armature 43. The push rod flange 51 is provided with a plurality of air guide grooves 511. The outer peripheral wall of the push rod 5 is provided with a plurality of axially extending exhaust grooves 52. The exhaust grooves 52 are connected to the armature exhaust port 431 through the air guide grooves 511. The lower end of the first axial through hole 421 is expanded outward to form a damping groove 424. The projection of the groove opening of the damping groove 424 on the lower end surface of the lower electrode plate 42 in the axial direction is at least partially offset from the projection of the upper end surface of the valve core 62 in the axial direction, so that when the valve core 62 moves upward in the axial direction to the maximum stroke, the upper end surface of the valve core 62 abuts against the lower end surface of the lower electrode plate 42 without entering the damping groove 424.

[0022] In the above structure, the armature exhaust port 431 is connected to the valve core 62 through the air guide groove 511, exhaust groove 52, and damping groove 424. Under the action of the armature 43 and the elastic element 64, when the push rod 5 and the valve core 62 move axially, the air can be guided and exhausted quickly and in a timely manner, so as to avoid the gas being compressed and causing resistance to the push rod 5 or interfering with the stable movement of the push rod 5. At the same time, when the valve core 62 moves upward axially, the hydraulic oil between the valve core 62 and the push rod 5 impacts the lower electrode plate 42 and the push rod 5. At this time, the oil will diffuse into the damping groove, and the damping groove 424 plays a role in buffering the oscillation and reducing the interference of hydraulic oil on the movement of the push rod 5.

[0023] In one embodiment, the lower end of the lower electrode plate 42 extends into an extension sleeve 425, which is fitted onto the upper end of the valve sleeve 61 and seals against it. The upper end of the valve sleeve 61 has a dirt-collecting groove 63, and the upper end of the valve core 62 passes through the dirt-collecting groove 63 to approach the lower end of the push rod 5. The inner diameter of the dirt-collecting groove 63 is larger than the diameter of the upper end of the valve core 62. The dirt-collecting groove 63 and the damping groove 424 together form a cavity containing hydraulic oil. Under the action of the armature 43 and the elastic element 64, the lower end of the push rod 5 and the upper end of the valve core 62 slide axially within the cavity. The cavity contains hydraulic oil, which provides lubrication and protection. Simultaneously, the hydraulic oil carries away dirt and wear particles. The dirt-collecting groove 63 can accommodate dirt and wear particles, preventing them from entering the first axial through hole 421 and affecting the axial movement of the push rod 5.

[0024] In one embodiment, the air guide groove 511 is disposed on the upper surface of the push rod flange 51 and forms a notch on the outer peripheral wall of the push rod flange 51. The air guide groove 511 communicates with the exhaust groove 52 through an air guide hole 512 penetrating the push rod flange 51. The airflow in the exhaust groove 52 flows through the air guide hole 512 into the air guide groove 511, with part of it dissipating to the outer periphery of the push rod flange 51 and the other part entering the armature exhaust port 431. In one embodiment, the upper end face of the lower electrode plate 42 is provided with a downwardly recessed first notch 422, and the bottom surface of the first notch 422 is provided with a downwardly recessed second notch 423. The recess depth of the second notch 423 relative to the bottom surface of the first notch 422 is h. The first notch 422 and the second notch 423 are coaxially arranged with the first axial through hole 421 and combined in a stepped shape. When the armature 43 is axially displaced downward, the lower end of the armature 43 is radially limited within the first notch 422. The thickness of the push rod flange 51 is a, and a > h. When the armature 43 pushes the push rod 5 and moves downward along the axial direction to the maximum stroke, the radial limit of the push rod flange 51 is located within the second notch 423 and abuts against the bottom surface of the second notch 423. The lower end of the armature 43 is clearance-fitted with the bottom surface of the first notch 422. This design ensures that the armature 43 does not contact the lower electrode plate 42 when it moves downward to its maximum stroke. With the same axial length of the solenoid valve's drive assembly, this design allows the push rod 5 to have a larger stroke range compared to the push rod flange directly contacting the upper surface of the lower electrode plate at its maximum stroke. The drive assembly structure is more compact and has greater electromagnetic force.

[0025] In one embodiment, the armature 43 is fitted with a bushing 3. The armature 43 is axially displaced relative to the bushing 3 under electromagnetic action. The top of the bushing 3 is provided with a bushing protrusion 32 protruding towards the armature 43. When the armature 43 moves upward along the axial direction to its maximum stroke, the top surface of the armature 43 abuts against the bushing protrusion 32. The bushing protrusion 32 limits the upward stroke of the armature 43 and reduces the contact area between the armature 43 and the bushing, so that the solenoid valve has a faster response time.

[0026] In one embodiment, the upper electrode plate 41, lower electrode plate 42, armature 43, coil 44, and push rod 5 are all installed inside the housing 2 of the proportional solenoid valve. The upper end of the housing 2 is connected to a terminal block 11 and an integrally formed terminal protective sleeve 1. The valve sleeve 61 and valve core 62 are located at the lower end of the housing 2. The housing 2 includes an axially extending sleeve portion and a constricted portion 23 connected to the upper end of the sleeve portion and bent radially inward relative to the sleeve portion. The constricted portion 23 has a wiring opening. The lower end of the terminal protective sleeve 1 is confined within the housing 2, and the upper end of the terminal protective sleeve 1 and the terminal block 11 extend upward beyond the wiring opening. A first annular groove is provided on the outer periphery of the lower end of the terminal protective sleeve 1. A first sealing ring 21 is provided between the first annular groove and the inner wall of the housing 2, and the first sealing ring 21 is located at the angle between the sleeve portion and the constricted portion 23. The solenoid valve's terminal block and terminal protective sleeve are integrally injection molded, resulting in better sealing performance and preventing hydraulic oil leakage. Figure 2As shown, the connection between the outer shell and the sleeve is in an r-shape. The first sealing ring 21 is disposed in the r-shaped corner of the inner wall of the outer shell 2, so that the outer shell 2 and the terminal protective sleeve 1 are sealed together. In this embodiment, both the solenoid valve outer shell and the wiring terminal are designed with a corrosion-resistant coating to achieve corrosion protection.

[0027] In one embodiment, the armature 43 is fitted with a bushing 3; the upper electrode plate 41 and the lower electrode plate 42 are separately disposed, the upper electrode plate 41 includes a second cylindrical portion and a second flange portion 411 connected to the outer periphery of the second cylindrical portion, the second cylindrical portion has a second axial through hole for the armature 43 and the bushing 3 to pass through, the lower electrode plate 42 includes a first cylindrical portion 426 having a first axial through hole 421 and a first flange portion 427 connected to the outer periphery of the first cylindrical portion 426; the coil 44 is located on the outer periphery of the first cylindrical portion 426 and the second cylindrical portion, and is axially limited between the first flange portion 427 and the second flange portion 411; the armature 43 is axially displaced relative to the bushing 3 under electromagnetic action, and the upper electrode plate 41 and the lower electrode plate 42 are axially positioned relative to the bushing 3. The upper electrode plate 41 and the lower electrode plate 42 are set separately, which makes the structure simpler, easier to produce, and more economical. The armature surface has an anti-wear coating, which, together with the bushing, plays a role in anti-wear and extending the armature life. At the same time, the bushing plays a good role in corrosion protection and sealing.

[0028] Furthermore, the bushing 3 extends downward between the first flange portion 427 and the coil 44, and a second sealing ring 31 is provided between the lower electrode plate 42 and the bushing 3, with the second sealing ring 31 located at the angle between the first cylindrical portion 426 and the first flange portion 427. This seals the hydraulic oil inside the solenoid valve, preventing leakage.

[0029] Furthermore, the bushing 3, upper electrode plate 41, lower electrode plate 42, armature 43, coil 44, and push rod 5 are all installed inside the housing 2 of the proportional solenoid valve. The first flange portion 427 is located at the lower opening of the housing 2, and a second annular groove is provided on the outer periphery of the first flange portion 427. A second sealing ring 31 is provided between the second annular groove and the inner wall of the housing 2. This further prevents hydraulic oil leakage.

[0030] Furthermore, the lower opening of the outer casing 2 is connected to a mounting portion extending radially outward from the outer casing 2. The mounting portion is used for positioning and connecting with the valve plate of the proportional solenoid valve through a screw hole 22 through which a bolt passes. The lower end face of the lower electrode plate 42 protrudes axially from the lower end face of the mounting portion. The valve plate is used to seal the outer casing of the solenoid valve and position the solenoid valve. The lower electrode plate 42 protrudes slightly axially from the lower end face of the outer casing 2. The bolt passes through the screw hole 22 to connect the outer casing 2 and the valve plate. After tightening, the proportional solenoid valve is fixed on the valve plate without shaking, and its internal structure is also stably positioned.

[0031] In this embodiment, the valve core 62 and valve sleeve 61 are segmented, with sections having different diameters in the axial direction. The different diameters enable the solenoid valve to regulate pressure. Correspondingly, the inner diameter of the valve sleeve is designed with a variable diameter to expand the cavity, allowing the solenoid valve of the same volume to have a larger flow rate. Multiple valve sleeve sealing rings 611 are provided on the outside of the valve sleeve. Furthermore, the valve core in this embodiment adopts an irregular shape design to perform hydraulic compensation on the valve body. A pressure equalization groove is designed in the valve core to give the valve core better pressure curve performance.

[0032] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0033] In the description of this application, the reference to terms such as "this embodiment," "an embodiment," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A proportional solenoid valve, comprising an upper electrode plate (41), a lower electrode plate (42), an armature (43), a coil (44), a push rod (5), a valve sleeve (61), a valve core (62), and an elastic element (64) for maintaining the valve core (62) having a tendency to move towards the lower electrode plate (42), wherein the lower electrode plate (42) is provided with a first axial through hole (421) through which the push rod (5) passes, and the armature (43) is axially displaced under electromagnetic action to push the push rod (5) to move axially relative to the lower electrode plate (42), thereby pushing the valve core (62) to move axially relative to the valve sleeve (61), characterized in that: The armature (43) is provided with an axially penetrating armature exhaust port (431), and the upper end of the push rod (5) is provided with a push rod flange (51) that is in transmission cooperation with the armature (43). The surface of the push rod flange (51) is provided with an air guide groove (511), and the outer peripheral wall of the push rod (5) is provided with an axially extending exhaust groove (52). The exhaust groove (52) is connected to the armature exhaust port (431) through the air guide groove (511). The lower end of the first axial through hole (421) is expanded to form a damping groove (424). The projection of the groove opening of the damping groove (424) on the lower end face of the lower electrode plate (42) in the axial direction is at least partially offset from the projection of the upper end face of the valve core (62) in the axial direction, so that when the valve core (62) moves upward in the axial direction to the maximum stroke, the upper end face of the valve core (62) abuts against the lower end face of the lower electrode plate (42) without entering the damping groove (424).

2. The proportional solenoid valve according to claim 1, characterized in that: The lower end of the lower electrode plate (42) is sealed to the upper end of the valve sleeve (61). The upper end of the valve sleeve (61) has a dirt-collecting groove (63). The upper end of the valve core (62) passes through the dirt-collecting groove (63) to approach the lower end of the push rod (5). The inner diameter of the dirt-collecting groove (63) is larger than the diameter of the upper end of the valve core (62). The dirt-collecting groove (63) and the damping groove (424) together form a cavity containing hydraulic oil. Under the action of the armature (43) and the elastic element (64), the lower end of the push rod (5) and the upper end of the valve core (62) slide axially within the cavity.

3. The proportional solenoid valve according to claim 1, characterized in that: The air guide groove (511) is provided on the upper surface of the top rod flange (51) and a notch is formed on the outer peripheral wall of the top rod flange (51). The air guide groove (511) is connected to the exhaust groove (52) through the air guide hole (512) penetrating the top rod flange (51).

4. The proportional solenoid valve according to claim 1, characterized in that: The upper end face of the lower electrode plate (42) is provided with a first recessed groove (422) and the bottom surface of the first recessed groove (422) is provided with a second recessed groove (423). The recessed depth of the second groove (423) relative to the bottom surface of the first groove (422) is h. The first groove (422) and the second groove (423) are coaxially arranged with the first axial through hole (421) and combined in a stepped shape. When the armature (43) is axially displaced downward, the lower end of the armature (43) is radially limited within the first groove (422). The thickness of the top rod flange (51) is a, and a > h. When the armature (43) pushes the top rod (5) to move downward along the axial direction to the maximum stroke, the top rod flange (51) is radially limited in the second notch (423) and abuts the bottom surface of the second notch (423). The lower end of the armature (43) is clearance-fitted with the bottom surface of the first notch (422).

5. The proportional solenoid valve according to claim 1, characterized in that: The armature (43) is fitted with a bushing (3). The armature (43) is axially displaced relative to the bushing (3) under electromagnetic action. The top of the bushing (3) is provided with a bushing protrusion (32) protruding towards the armature (43). When the armature (43) moves upward along the axis to the maximum stroke, the top surface of the armature (43) abuts against the bushing protrusion (32).

6. The proportional solenoid valve according to claim 1, characterized in that: The upper electrode plate (41), lower electrode plate (42), armature (43), coil (44), and push rod (5) are all installed inside the housing (2) of the proportional solenoid valve. The upper end of the housing (2) is connected to a wiring terminal (11) and an integrally formed terminal protective sleeve (1). The outer casing (2) includes an axially extending sleeve portion and a constricted portion (23) connected to the upper end of the sleeve portion and bent radially inward relative to the sleeve portion. The constricted portion (23) is provided with a wiring opening. The lower end of the terminal protective sleeve (1) is limited to the outer casing (2), and the upper end of the terminal protective sleeve (1) and the wiring terminal (11) extend upward out of the wiring opening. The lower end of the terminal protective sleeve (1) is provided with a first annular groove, and a first sealing ring (21) is provided between the first annular groove and the inner wall of the outer shell (2), and the first sealing ring (21) is located at the angle between the sleeve part and the closing part (23).

7. The proportional solenoid valve according to claim 1, characterized in that: The armature (43) is fitted with a bushing (3); The upper electrode plate (41) and the lower electrode plate (42) are separately disposed. The upper electrode plate (41) includes a second cylindrical portion and a second flange portion (411) connected to the outer periphery of the second cylindrical portion. The second cylindrical portion has a second axial through hole through which the armature (43) and the bushing (3) pass. The lower electrode plate (42) includes a first cylindrical portion (426) having a first axial through hole (421) and a first flange portion (427) connected to the outer periphery of the first cylindrical portion (426). The coil (44) is located on the outer periphery of the first cylindrical portion (426) and the second cylindrical portion, and is axially confined between the first flange portion (427) and the second flange portion (411); The armature (43) is axially displaced relative to the bushing (3) under electromagnetic action, and the upper electrode plate (41) and the lower electrode plate (42) are axially positioned relative to the bushing (3).

8. The proportional solenoid valve according to claim 7, characterized in that: The bushing (3) extends downward between the first flange (427) and the coil (44), and a second sealing ring (31) is provided between the lower electrode plate (42) and the bushing (3), and the second sealing ring (31) is located at the angle between the first cylindrical part (426) and the first flange (427).

9. The proportional solenoid valve according to claim 7, characterized in that: The bushing (3), upper electrode plate (41), lower electrode plate (42), armature (43), coil (44), and push rod (5) are all installed inside the housing (2) of the proportional solenoid valve. The first flange (427) is located at the lower opening of the housing (2), and a second annular groove is provided on the outer periphery of the first flange (427). A second sealing ring (31) is provided between the second annular groove and the inner wall of the housing (2).

10. The proportional solenoid valve according to claim 9, characterized in that: The lower end opening of the housing (2) is connected to a mounting part that extends radially outward from the housing (2). The mounting part is used for positioning and connecting with the assembly plane of the proportional solenoid valve. The lower end face of the lower electrode plate (42) protrudes axially from the lower end face of the mounting part.

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