Proportional solenoid valve

Abstract

The application relates to a proportional electromagnetic valve. The proportional electromagnetic valve comprises a valve body assembly, a static iron assembly, a coil assembly and a moving iron assembly. The valve body assembly comprises a shell, a valve seat and a valve head. The valve seat is connected with the shell, the valve head is arranged in the valve seat, the valve seat is provided with a first accommodating cavity, the shell is provided with a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are communicated, the valve head is provided with an input channel, the valve seat is provided with an output channel, and the input channel and the output channel are communicated with the first accommodating cavity. The static iron assembly is mounted on the shell, and the coil assembly is arranged around the static iron assembly. The moving iron assembly is movably arranged in the first accommodating cavity and the second accommodating cavity. The moving iron assembly comprises a moving iron, a valve core and an elastic sheet. The moving iron is connected with the valve core, the valve core movably abuts on the input channel of the valve head, the elastic sheet is mounted on the shell, the moving iron is connected with the elastic sheet, and the elastic sheet is used for applying pressure to the moving iron towards the valve head. The proportional electromagnetic valve has the advantages of high control precision and simple machining.

Description

Technical Field

[0001] This application relates to the field of solenoid valve technology, and in particular to a proportional solenoid valve. Background Technology

[0002] A proportional solenoid valve is a type of solenoid valve that precisely controls the input or output flow of gas or liquid using current or PWM methods. It is widely used in medical, automotive and other fields.

[0003] Most proportional solenoid valves on the market have less than ideal linearity and hysteresis curves, making debugging very cumbersome and failing to meet the high-precision control requirements of the medical industry. Furthermore, traditional solenoid valves use a one-piece machining process, which results in high manufacturing difficulty, high manufacturing costs, and low control accuracy. Summary of the Invention

[0004] Therefore, it is necessary to provide a proportional solenoid valve to address the problems of high manufacturing difficulty and low control accuracy of proportional solenoid valves.

[0005] A proportional solenoid valve, comprising:

[0006] A valve body assembly includes a housing, a valve seat, and a valve head. The valve seat is connected to the housing, and the valve head is movably disposed within the valve seat. The valve seat has a first accommodating cavity, and the housing has a second accommodating cavity. The first accommodating cavity and the second accommodating cavity are connected. The valve head has an input channel, and the valve seat has an output channel. Both the input channel and the output channel are connected to the first accommodating cavity.

[0007] A stationary iron assembly and a coil assembly, wherein the stationary iron assembly is mounted on the end of the housing away from the valve head, and the coil assembly is arranged around the stationary iron assembly;

[0008] A moving iron assembly is movably disposed in the first accommodating cavity and the second accommodating cavity. The moving iron assembly includes a moving iron, a spring, and a valve core. The moving iron and the valve core are connected. The valve core is movably abutted against the input channel of the valve head. The spring is mounted on the housing. The moving iron is connected to the spring. The spring is used to apply pressure to the moving iron toward the valve head.

[0009] In one embodiment, the moving iron assembly further includes a connector, the moving iron and the valve core are connected by the connector, the outer periphery of the spring is connected to the housing, the center of the spring is provided with a through hole, the connector is provided with a boss, the connector passes through the through hole and is connected to the moving iron, and the spring is engaged between the boss and the moving iron.

[0010] In one embodiment, the moving iron assembly further includes a diaphragm and a pressure plate. The diaphragm covers the end face of the valve seat, and the pressure plate covers the connection between the diaphragm and the valve seat. The connector is connected to the valve core through the diaphragm, and the diaphragm is engaged between the boss and the valve core.

[0011] In one embodiment, the connector is provided with a communication channel for connecting the input channel and the second accommodating cavity.

[0012] In one embodiment, the valve core further includes a seal disposed at the portion of the valve core that abuts against the valve head.

[0013] In one embodiment, the valve head and the valve seat are connected by a threaded pair, and the valve head is provided with a locking ring for locking or unlocking the valve head and the valve seat.

[0014] In one embodiment, the stationary iron assembly includes a stationary iron and an adjusting rod. The stationary iron is mounted on the end face of the housing away from the valve head. The stationary iron is provided with an adjusting through hole. The adjusting rod is movably disposed in the adjusting through hole. The end of the adjusting rod away from the moving iron is provided with an adjusting part, and the end of the adjusting rod facing the moving iron is provided with an abutting part for abutting the moving iron.

[0015] In one embodiment, the coil assembly includes a coil frame and a coil, the coil frame being disposed around the stationary iron, the coil being disposed around the coil frame, and a corrugated spring being provided between the end of the coil frame and the stationary iron.

[0016] In one embodiment, the coil assembly further includes a connector and a lead wire, the housing is provided with a mounting slot, the connector is mounted in the mounting slot, and the lead wire is connected to the coil through the connector.

[0017] In one embodiment, the stationary iron, the moving iron, the valve core, and the valve head are arranged along the same axis.

[0018] The aforementioned proportional solenoid valve features a stationary iron assembly and a coil assembly within the housing, a valve head within the valve seat, and a moving iron assembly within the cavity between the valve seat and the housing. When the proportional solenoid valve is closed, the coil assembly is not energized, and the moving iron is only subjected to the pressure of the spring, pushing the moving iron and valve core against the valve head. This causes the valve core to cover the input channel of the valve head, achieving a seal. When the proportional solenoid valve is open, the coil assembly is energized, and adjusting the current causes the stationary iron assembly to generate an electromagnetic force that attracts the moving iron upward. This causes the moving iron to separate the valve core from the valve head. During the upward movement of the moving iron, it is also subjected to a downward force generated by the spring. The two forces balance each other to maintain the opening of the input channel. The greater the current, the greater the electromagnetic force, the greater the distance the moving iron moves away from the valve head, and the larger the opening of the input channel. This allows for a larger flow rate through the input channel, resulting in excellent linearity and hysteresis performance of the flow-current curve, thus enabling precise control of the input channel opening. It also adopts a separate manufacturing process for the valve seat and the outer shell, which greatly reduces the difficulty of processing. The processing can be completed on a lathe, so as to meet the high-precision flow control needs in many industries. It has the advantages of high control accuracy and simple processing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the proportional solenoid valve described in the embodiments of this application.

[0020] Figure 2 This is a cross-sectional view of the proportional solenoid valve described in the embodiments of this application.

[0021] Figure 3 This is an enlarged view of the proportional solenoid valve described in the embodiments of this application.

[0022] Reference numerals: 100, valve body assembly; 110, housing; 110A, second accommodating cavity; 120, valve seat; 120A, output channel; 120B, first accommodating cavity; 130, valve head; 130A, input channel; 131, locking ring;

[0023] 200, stationary iron assembly; 210, stationary iron; 210A, adjusting through hole; 220, adjusting rod;

[0024] 300. Coil assembly; 310. Coil; 320. Coil frame; 330. Corrugated spring; 340. Wire connector; 350. Lead wire;

[0025] 400, Moving iron assembly; 410, Moving iron; 420, Valve core; 421, Seal; 430, Spring; 440, Connecting shaft; 440A, Connecting channel; 450, Diaphragm; 460, Pressure plate. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via 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. Similarly, "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.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 and Figure 2 , Figure 1 A schematic diagram of the proportional solenoid valve in one embodiment of this application is shown. Figure 2 This diagram shows a cross-sectional view of a proportional solenoid valve according to an embodiment of this application. The proportional solenoid valve provided in this embodiment includes a valve body assembly 100, a stationary iron assembly 200, a coil assembly 300, and a moving iron assembly 400. The valve body assembly 100 includes a housing 110, a valve seat 120, and a valve head 130. The end of the valve seat 120 is connected to the end of the housing 110. The valve head 130 is movably disposed within the valve seat 120. The valve seat 120 has a first accommodating cavity 120B, and the housing 110 has a second accommodating cavity 110A. The first accommodating cavity 120B and the second accommodating cavity 110A communicate with each other. The valve head 130 has an input channel 130A, and the valve seat 120 has an output channel 120A. The input channel 130A and the output channel 120A are connected. A is connected to the first accommodating cavity 120B; the stationary iron assembly 200 is installed at the end of the housing 110 away from the valve head 130, and the coil assembly 300 is arranged around the stationary iron assembly 200; the moving iron assembly 400 is movably arranged in the first accommodating cavity 120B and the second accommodating cavity 110A. The moving iron assembly 400 includes a moving iron 410, a valve core 420 and a spring plate 430. The moving iron 410 and the valve core 420 are connected. The valve core 420 is movably abutted against the input channel 130A of the valve head 130, thereby closing the connection between the input channel 130A and the first accommodating cavity 120B. The spring plate 430 is installed in the housing 110. The moving iron 410 is connected to the spring plate 430. The spring plate 430 is used to apply pressure toward the valve head 130 to the moving iron 410.

[0033] The proportional solenoid valve described in this application embodiment has a stationary iron assembly 200 and a coil assembly 300 disposed in the housing 110, a valve head 130 disposed in the valve seat 120, and a moving iron assembly 400 disposed in the first accommodating cavity 120B and the second accommodating cavity 110A between the valve seat 120 and the housing 110. When the proportional solenoid valve is closed, the coil assembly 300 is not energized, and the moving iron 410 is only subjected to the pressure of the spring 430, which pushes the moving iron 410 and the valve core 420 to abut against the valve head 130, so that the valve core 420 abuts against the input channel 130A of the valve head 130, thereby sealing the input channel 130A. When the proportional solenoid valve is open, after the coil assembly 300 is energized, the current is adjusted so that the stationary iron assembly 200 generates an electromagnetic force to attract the moving iron 410 to move towards the stationary iron assembly 200, so that the moving iron 410 drives the valve core 420 to separate from the valve head 130. During the process of the moving iron 410 moving towards the stationary iron assembly 200, it is also subjected to the force generated by the spring 430 towards the valve head 130. The two forces reach a balance to maintain the opening of the input channel 130A. The larger the current, the greater the electromagnetic force, the greater the distance of the moving iron 430 from the valve head 130, and the larger the opening of the input channel 130A, so that the input channel 130A can input a larger flow.

[0034] The proportional solenoid valve described in this application embodiment is manufactured in a split configuration, dividing the valve body assembly 100 into a housing 110 and a valve seat 120, which greatly reduces the difficulty of machining. Machining can be completed on a lathe. Furthermore, by setting a spring 430 to balance the electromagnetic force felt by the moving iron 410, the linearity and hysteresis performance of the flow current curve are excellent, thereby accurately controlling the opening of the input channel 130A to meet the high-precision flow control requirements in multiple industries. It has the advantages of high control accuracy and simple machining.

[0035] Combination Figure 3 As shown, Figure 3An enlarged schematic diagram of a proportional solenoid valve according to one embodiment of this application is shown. In some embodiments, the moving iron assembly 400 further includes a connector 440, and the moving iron 410 and the valve core 420 are connected by the connector 440. Specifically, the spring plate 430 is a circular piece, and its outer periphery is connected to the housing 110. The center of the spring plate 430 is provided with a through hole. The connector 440 is provided with a boss 441, and the connector 440 passes through the through hole and is connected to the moving iron 410. The spring plate 430 is engaged in the gap between the boss 441 and the moving iron 410. Specifically, a positioning groove may be provided on the inner sidewall of the housing 110 so that the outer periphery of the spring plate 430 is engaged in the positioning groove for fixation. By setting the connector 440 to pass through the through hole of the spring plate 430 to connect to the moving iron 410, and the boss 441 of the connector 440 to hold the spring plate 430 between the moving iron 410 and the boss 441, the spring plate 430 applies pressure to the moving iron 410 and the valve head 130. The matching method of the spring plate 430 and the moving iron 410 makes the linearity and hysteresis performance of the current flow curve excellent, and makes the flow control of the proportional solenoid valve precise.

[0036] Furthermore, such as Figure 2 As shown, the stationary iron 210, moving iron 410, valve core 420, and valve head 130 are arranged along the same axis. The spring plate 430 provides pressure to the moving iron 410 while also ensuring the coaxiality of the moving iron 410 relative to the coil assembly 300 inside the housing 110. This ensures that the moving iron 410 moves vertically up and down within the housing assembly 100, avoiding contact with the housing 110 and coil assembly 300, reducing or even eliminating friction between the moving iron 410 and the coil assembly 300. Furthermore, the lower half of the moving iron assembly 400, and the valve core 420 and valve head 130, also move vertically up and down, preventing tilting that would cause one side of the valve core 420 to contact the valve head 130 first. This results in better linearity and hysteresis performance of the flow-current curve.

[0037] In an optional embodiment, such as Figure 2 and Figure 3 As shown, the moving iron assembly 400 also includes a diaphragm 450 and a pressure plate 460. The diaphragm 450 covers the end face of the valve seat 120, and the pressure plate 460 covers the connection between the diaphragm 450 and the valve seat 120. The connector 440 is connected to the valve core 420 through the diaphragm 450, and the diaphragm 450 is engaged in the gap between the boss 441 and the valve core 420. The diaphragm 450 serves as the boundary between the first accommodating cavity 120 and the second accommodating cavity 110A. When the coil assembly 300 is energized, the input channel 120A connects to the first accommodating cavity 120B, allowing gas or liquid to enter the first accommodating cavity 120B and then exit through the output channel 120A.

[0038] Furthermore, such as Figure 3As shown, the connector 440 is provided with a connecting channel 440A, which connects the input channel 130A and the second accommodating chamber 110A. By providing the connecting channel 440A in the connector 440, when the proportional solenoid valve is closed, the input channel 130A and the second accommodating chamber 110A are connected, allowing gas or liquid to enter the second accommodating chamber 110A. Thus, the sealing force on the valve head 130 is composed of the spring 430 and the back pressure of the fluid. This reduces the pre-pressure of the spring 430. With the pressure within the connecting channel 440A, a smaller spring force is needed to seal the valve head 130. Furthermore, the initial pre-compression of the spring 430 is reduced, allowing for a larger spring compression stroke to match the electromagnetic force, resulting in a longer flow curve and a higher maximum flow rate. This back-pressure structure can be applied under different pressure conditions because the pressure in the connecting channel 440A and the back pressure can cancel each other out, facilitating more precise control of the proportional solenoid valve.

[0039] In an optional embodiment, such as Figure 3 As shown, the valve core 420 also includes a seal 421, which is disposed at the portion of the valve core 420 that abuts against the valve head 130. Specifically, the seal 421 is made of elastic materials such as silicone or rubber. Since the valve core 420 abuts against the valve head 130 when the proportional solenoid valve is closed, it is used to seal the input channel 130A. By providing the seal 421 at the abutment portion, the sealing performance when the valve core 420 is connected to the valve head 130 is improved, thereby enhancing the operational stability of the proportional solenoid valve.

[0040] In an optional embodiment, such as Figure 2 As shown, the valve head 130 and valve seat 120 are connected by a threaded pair. The valve head 130 is equipped with a locking ring 131, which is used to lock or unlock the valve head 130 and valve seat 120. By connecting the valve head 130 and valve seat 120 through the threaded pair, the position of the valve head 130 on the valve seat 120 can be adjusted by rotating the valve head 130, thereby adjusting the pre-compression of the spring 430 to adjust the initial sealing force of the moving iron assembly 400. Rotating the valve head 130 upward increases the sealing force, while rotating it downward decreases it. Compared with traditional proportional solenoid valves, this significantly reduces the development and verification time cycle. Once the desired sealing force is determined, the position of the valve head 130 can be fixed by the locking ring 131. When adjustment is needed, the locking ring 131 can be used to unlock the valve head 130, which has the advantage of convenient operation.

[0041] In an optional embodiment, such as Figure 2As shown, the stationary iron assembly 200 includes a stationary iron 210 and an adjusting rod 220. The stationary iron 210 is mounted on the end face of the housing 110 away from the valve head 130. The stationary iron 210 has an adjusting through hole 210A. The adjusting rod 220 is movably disposed within the adjusting through hole 210A. The end of the adjusting rod 220 away from the moving iron 410 has an adjusting portion, and the end of the adjusting rod 220 facing the moving iron 410 has an abutting portion for abutting against the moving iron 410. In this embodiment, the adjusting rod 220 and the stationary iron 210 are connected by a threaded pair. By providing the adjusting hole 210A in the stationary iron 210, and the adjusting rod 220 being disposed within the adjusting hole 210A, the position of the adjusting rod 220 is set by the adjusting portion. This prevents the moving iron 410 and the stationary iron 210 from making complete contact, as contact would result in a large electromagnetic force, which would significantly affect the hysteresis of the proportional valve. The adjusting rod 220 can also adjust the maximum stroke of the moving iron 410 by adjusting its position, thereby adjusting the maximum output flow rate, which has the advantages of improving control accuracy and adjusting convenience.

[0042] In an optional embodiment, such as Figure 2 As shown, the coil assembly 300 includes a coil frame 320 and a coil 310. The coil frame 320 is arranged around the stationary iron 210, and the coil 310 is arranged around the coil frame 320. A corrugated spring 330 is provided in the gap between the end of the coil frame 320 and the moving iron 410. The corrugated spring 330 can fill the gap between the end of the coil frame 320 and the moving iron 410 to prevent the coil frame 320 from sliding. By arranging the coil frame 320 around the stationary iron 210 and arranging the coil 310 on the coil frame 320, the stationary iron 210 applies an electromagnetic force to the moving iron 430.

[0043] Furthermore, such as Figure 2 As shown, the coil assembly 300 also includes a wire plug 340 and a lead wire 350. The housing 110 has a mounting groove, the wire plug 340 is installed in the mounting groove, and the lead wire 350 is connected to the coil 310 through the wire plug 340. Traditional proportional valves simply require drilling a slot in the housing and then leading out the lead wire, which is cumbersome and time-consuming. This embodiment of the invention adopts a unique wire exit method. By providing a mounting groove in the housing 110, the wire plug 340 is installed into the mounting groove, and the lead wire 350 is easily inserted into the wire plug 340 to complete the wiring. This method has the advantages of convenient assembly and aesthetic appearance.

[0044] The proportional solenoid valve described in this application has the following beneficial effects:

[0045] 1. The valve body assembly 100 is manufactured in a split configuration, dividing it into a housing 110 and a valve seat 120. This greatly reduces the difficulty of machining, allowing the process to be completed on a lathe. Furthermore, by setting a spring 430 to balance the electromagnetic force felt by the moving iron 410, the linearity and hysteresis performance of the flow current curve are excellent, thereby precisely controlling the opening of the input channel 130A to meet the high-precision flow control requirements of various industries. It has the advantages of high control accuracy and simple machining.

[0046] 2. The stationary iron 210, moving iron 410, valve core 420 and valve head 130 are arranged along the same axis to ensure that the moving iron 410 moves vertically up and down when it moves inside the housing assembly 100, avoiding contact with the housing 110 and the coil assembly 300, reducing or even eliminating the friction between the moving iron 410 and the coil assembly 300. In addition, the valve core 420 and the valve head 130 also move vertically up and down, avoiding tilting that would cause one side of the valve core 420 to contact the valve head 130 first, making the linearity and hysteresis performance of the flow current curve better.

[0047] 3. The back pressure structure allows for application under different pressure conditions, as the pressure and back pressure of the connecting channel 440A can cancel each other out, making it easier to accurately control the proportional solenoid valve.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A proportional solenoid valve, characterized in that, include: A valve body assembly (100) includes a housing (110), a valve seat (120), and a valve head (130). The valve seat (120) is connected to the housing (110), and the valve head (130) is movably disposed within the valve seat (120). The valve seat (120) has a first accommodating cavity (120B), and the housing (110) has a second accommodating cavity (110A). The first accommodating cavity (120B) and the second accommodating cavity (110A) are connected. The valve head (130) has an input channel (130A), and the valve seat (120) has an output channel (120A). Both the input channel (130A) and the output channel (120A) are connected to the first accommodating cavity (120B). A stationary iron assembly (200) and a coil assembly (300), the stationary iron assembly (200) being mounted on the end of the housing (110) away from the valve head (130), and the coil assembly (300) being arranged around the stationary iron assembly (200); A moving iron assembly (400) is movably disposed in the first accommodating cavity (120B) and the second accommodating cavity (110A). The moving iron assembly (400) includes a moving iron (410), a valve core (420), and a spring plate (430). The moving iron (410) and the valve core (420) are connected. The valve core (420) is movably abutted against the input channel (130A) of the valve head (130). The spring plate (430) is mounted on the housing (110). The moving iron (410) is connected to the spring plate (430). The spring plate (430) is used to apply pressure to the moving iron (410) toward the valve head (130).

2. The proportional solenoid valve according to claim 1, characterized in that: The moving iron assembly (400) also includes a connector (440), the moving iron (410) and the valve core (420) are connected by the connector (440), the outer periphery of the spring (430) is connected to the outer shell (110), the center of the spring (430) is provided with a through hole, the connector (440) is provided with a boss (441), the connector (440) passes through the through hole and is connected to the moving iron (410), and the spring (430) is engaged between the boss (441) and the moving iron (410).

3. The proportional solenoid valve according to claim 2, characterized in that: The moving iron assembly (400) further includes a diaphragm (450) and a pressure plate (460). The diaphragm (450) covers the end face of the valve seat (120), and the pressure plate (460) covers the connection between the diaphragm (450) and the valve seat (120). The connector (440) is connected to the valve core (420) through the diaphragm (450), and the diaphragm (450) is engaged between the boss (441) and the valve core (420).

4. The proportional solenoid valve according to claim 3, characterized in that: The connector (440) is provided with a communication channel (440A) for connecting the input channel (130A) and the second accommodating cavity (110A).

5. The proportional solenoid valve according to claim 1, characterized in that: The valve core (420) also includes a seal (421), which is disposed at the part of the valve core (420) that abuts against the valve head (130).

6. The proportional solenoid valve according to claim 1, characterized in that: The valve head (130) and the valve seat (120) are connected by a threaded pair. The valve head (130) is provided with a locking ring (131), which is used to lock or unlock the valve head (130) and the valve seat (120).

7. The proportional solenoid valve according to any one of claims 1-6, characterized in that: The stationary iron assembly (200) includes a stationary iron (210) and an adjusting rod (220). The stationary iron (210) is installed on the end face of the housing (110) away from the valve head (130). The stationary iron (210) is provided with an adjusting through hole (210A). The adjusting rod (220) is movably disposed in the adjusting through hole (210A). The end of the adjusting rod (220) away from the moving iron (410) is provided with an adjusting part. The end of the adjusting rod (220) facing the moving iron (410) is provided with an abutting part, which is used to abut against the moving iron (410).

8. The proportional solenoid valve according to claim 7, characterized in that: The coil assembly (300) includes a coil frame (320) and a coil (310). The coil frame (320) is arranged around the stationary iron (210), and the coil (310) is arranged around the coil frame (320). A corrugated spring (330) is provided between the end of the coil frame (320) and the stationary iron (210).

9. The proportional solenoid valve according to claim 8, characterized in that: The coil assembly (300) further includes a wire plug (340) and a lead wire (350). The housing (110) is provided with a mounting slot. The wire plug (340) is installed in the mounting slot. The lead wire (350) is connected to the coil (310) through the wire plug (340).

10. The proportional solenoid valve according to claim 7, characterized in that: The stationary iron (210), the moving iron (410), the valve core (420), and the valve head (130) are arranged along the same axis.

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