CN117927721A

CN117927721A - Proportional solenoid valve

Info

Publication number: CN117927721A
Application number: CN202410111260.XA
Authority: CN
Inventors: 黄剑楠; 张俊帆; 吴佩鸿
Original assignee: Ambulanc Shenzhen Tech Co Ltd
Current assignee: Ambulanc Shenzhen Tech Co Ltd
Priority date: 2024-01-25
Filing date: 2024-01-25
Publication date: 2024-04-26

Abstract

The present application relates to a proportional solenoid valve. The application relates to a proportional electromagnetic valve, which comprises a valve body assembly, a static iron assembly, a coil assembly and a moving iron assembly, wherein 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 is communicated with the second accommodating cavity, 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 both communicated with the first accommodating cavity; the static iron component is arranged on the shell, and the coil component is arranged around the static iron component; the movable iron component is movably arranged in the first accommodating cavity and the second accommodating cavity, the movable iron component comprises a movable iron, a valve core and an elastic piece, the movable iron is connected with the valve core, the valve core is movably abutted on an input channel of the valve head, the elastic piece is arranged on the shell, the movable iron is connected with the elastic piece, and the elastic piece is used for applying pressure towards the valve head to the movable iron. The proportional electromagnetic valve has the advantages of high control precision and simplicity in processing.

Description

Proportional solenoid valve

Technical Field

The application relates to the technical field of electromagnetic valves, in particular to a proportional electromagnetic valve.

Background

The proportional electromagnetic valve is an electromagnetic valve which can accurately control the input or output of the gas or liquid flow through a current or PWM mode, and is widely applied to the fields of medical treatment, automobiles and the like.

Most of proportional solenoid valves on the market are not ideal in linearity and hysteresis curves, are complicated to debug, and are difficult to meet the requirements of high-precision control in the medical industry. And the valve body of the traditional electromagnetic valve is integrally machined, so that the electromagnetic valve has the defects of high machining difficulty, high machining cost, low control accuracy and the like.

Disclosure of Invention

Accordingly, it is necessary to provide a proportional solenoid valve for solving the problems of the proportional solenoid valve such as high difficulty in processing and low control accuracy.

A proportional solenoid valve, comprising:

The valve body assembly comprises a shell, a valve seat and a valve head, wherein the valve seat is connected with the shell, the valve head is movably 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 is communicated with the second accommodating cavity, 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 both communicated with the first accommodating cavity;

The static iron assembly is arranged at the end part of the shell, which is far away from the valve head, and the coil assembly is arranged around the static iron assembly;

the movable iron component is movably arranged in the first accommodating cavity and the second accommodating cavity, and comprises a movable iron, an elastic sheet and a valve core, wherein the movable iron is connected with the valve core, the valve core is movably abutted to the input channel of the valve head, the elastic sheet is arranged on the shell, the movable iron is connected with the elastic sheet, and the elastic sheet is used for applying pressure towards the valve head to the movable iron.

In one embodiment, the moving iron assembly further comprises a connecting piece, the moving iron and the valve core are connected through the connecting piece, the outer periphery of the elastic piece is connected with the shell, a through hole is formed in the center of the elastic piece, a boss is arranged on the connecting piece, the connecting piece penetrates through the through hole and is connected with the moving iron, and the elastic piece is clamped between the boss and the moving iron.

In one embodiment, the moving iron assembly further comprises a diaphragm and a pressing plate, the diaphragm is arranged on the end face of the valve seat in a covering mode, the pressing plate is arranged on the joint of the diaphragm and the valve seat in a covering mode, the connecting piece is connected with the valve core through the diaphragm, and the diaphragm is clamped between the boss and the valve core.

In one embodiment, the connecting piece is provided with a communication channel, and the communication channel is used for communicating the input channel and the second accommodating cavity.

In one embodiment, the valve core further comprises a sealing element, and the sealing element is arranged at a position where the valve core abuts against the valve head.

In one embodiment, the valve head and the valve seat are connected through a screw pair, and the valve head is provided with a locking ring for locking or unlocking the valve head and the valve seat.

In one embodiment, the static iron assembly comprises a static iron and an adjusting rod, the static iron is arranged on the end face of the shell, which is far away from the valve head, the static iron is provided with an adjusting through hole, the adjusting rod is movably arranged in the adjusting through hole, one end of the adjusting rod, which is far away from the moving iron, is provided with an adjusting part, one end of the adjusting rod, which faces the moving iron, is provided with an abutting part, and the abutting part is used for abutting the moving iron.

In one embodiment, the coil assembly comprises a coil former and a coil, the coil former is arranged around the static iron, the coil is arranged around the coil former, and a corrugated elastic sheet is arranged between the end part of the coil former and the static iron.

In one embodiment, the coil assembly further comprises a wire insert and a lead, the housing is provided with a mounting groove, the wire insert is mounted in the mounting groove, and the lead is connected with the coil through the wire insert.

In one embodiment, the stationary iron, the moving iron, the valve spool and the valve head are disposed along the same axis.

According to the proportional electromagnetic valve, the static iron component and the coil component are arranged in the shell, the valve head is arranged in the valve seat, and the moving iron component is arranged in the accommodating cavity between the valve seat and the shell. When the proportional electromagnetic valve is closed, the coil assembly is not electrified, the movable iron only receives the pressure of the elastic sheet, and the movable iron and the valve core are pushed to be abutted against the valve head, so that the valve core covers an input channel of the valve head, and sealing is realized; when the proportional solenoid valve is opened, the coil assembly is electrified, the current is adjusted to enable the static iron assembly to generate electromagnetic force to attract the actuating iron to move upwards, so that the moving iron drives the valve core to be separated from the valve head, downward force generated by the elastic sheet is received in the upward moving process of the moving iron, the two forces reach balance to keep the opening degree of the input channel, the larger the current is, the larger the electromagnetic force is, the larger the distance of the moving iron away from the valve head is, the larger the opening degree of the input channel is, the larger the flow of the input channel is enabled to flow, and the linearity and hysteresis performance of a flow current curve are excellent, so that the opening degree of the input channel is accurately controlled. The valve seat and the shell are manufactured in a split mode, machining difficulty is greatly reduced, machining can be completed on a lathe, high-precision flow control requirements in multiple industries are met, and the valve seat and shell combined type automatic valve has the advantages of being high in control precision and simple in machining.

Drawings

Fig. 1 is a schematic structural diagram of a proportional solenoid valve according to an embodiment of the present application.

Fig. 2 is a sectional view of a proportional solenoid valve according to an embodiment of the present application.

Fig. 3 is an enlarged view of a proportional solenoid valve according to an embodiment of the present application.

Reference numerals: 100. a valve body assembly; 110. a housing; 110A, a second receiving chamber; 120. a valve seat; 120A, output channels; 120B, a first receiving chamber; 130. a valve head; 130A, input channels; 131. a locking ring;

200. a static iron assembly; 210. static iron; 210A, adjusting the through hole; 220. an adjusting rod;

300. A coil assembly; 310. a coil; 320. a coil bobbin; 330. a corrugated spring plate; 340. wire insertion; 350. a lead wire;

400. A moving iron assembly; 410. a moving iron; 420. a valve core; 421. a seal; 430. a spring plate; 440. a connecting shaft; 440A, communication channels; 450. a membrane; 460. and (5) pressing plates.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1 and 2, fig. 1 shows a schematic structural view of a proportional solenoid valve in an embodiment of the present application, fig. 2 shows a schematic sectional view of a proportional solenoid valve in an embodiment of the present application, the proportional solenoid valve provided in an embodiment of the present application includes a valve body assembly 100, a static 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, an end of the valve seat 120 is connected to an end of the housing 110, the valve head 130 is movably disposed in the valve seat 120, the valve seat 120 is provided with a first accommodating chamber 120B, the housing 110 is provided with a second accommodating chamber 110A, the first accommodating chamber 120B and the second accommodating chamber 110A are communicated, the valve head 130 is provided with an input channel 130A, the valve seat 120 is provided with an output channel 120A, and both the input channel 130A and the output channel 120A are communicated with the first accommodating chamber 120B; the static iron assembly 200 is mounted to the end of the housing 110 remote from the valve head 130, and the coil assembly 300 is disposed around the static iron assembly 200; the 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 is connected with the valve core 420, the valve core 420 is movably abutted on the input channel 130A of the valve head 130, so as to close the connection between the input channel 130A and the first accommodating cavity 120B, the spring plate 430 is mounted on the housing 110, the moving iron 410 is connected with the spring plate 430, and the spring plate 430 is used for applying pressure to the moving iron 410 towards the valve head 130.

According to the proportional solenoid valve of the embodiment of the application, the static iron assembly 200 and the coil assembly 300 are arranged in the shell 110, the valve head 130 is arranged in the valve seat 120, and the moving iron assembly 400 is arranged in the first accommodating cavity 120B and the second accommodating cavity 110A between the valve seat 120 and the shell 110. When the proportional solenoid valve is closed, the coil assembly 300 is not electrified, the movable iron 410 only receives the pressure of the elastic sheet 430, and the movable iron 410 and the valve core 420 are pushed to be abutted against the valve head 130, so that the valve core 420 is abutted against the input channel 130A of the valve head 130, and the input channel 130A is sealed; when the proportional solenoid valve is opened, after the coil assembly 300 is electrified, the magnitude of current is regulated to enable the static iron assembly 200 to generate electromagnetic force to attract the actuating iron 410 to move towards the static iron assembly 200, so that the actuating iron 410 drives the valve core 420 to be separated from the valve head 130, the two forces generated by the elastic sheet 430 towards the valve head 130 are balanced in the moving process of the actuating iron 410 towards the static iron assembly 200, the opening of the input channel 130A is kept, the electromagnetic force is larger as the current is larger, the distance of the actuating iron 430 away from the valve head 130 is larger, and the opening of the input channel 130A is larger, so that the input channel 130A can input larger flow.

According to the proportional solenoid valve disclosed by the embodiment of the application, split type manufacturing is adopted, the valve body assembly 100 is divided into the shell 110 and the valve seat 120, so that the processing difficulty is greatly reduced, the processing can be finished on a lathe, and the electromagnetic force sensed by the moving iron 410 is balanced by the elastic sheet 430, so that the linearity and hysteresis performance of a flow current curve are excellent, the opening degree of the input channel 130A is accurately controlled, the high-precision flow control requirement in the fields of multiple industries is met, and the proportional solenoid valve has the advantages of high control precision and simplicity in processing.

Referring to fig. 3, fig. 3 is an enlarged schematic view of a proportional solenoid valve according to an embodiment of the application, and in some embodiments, the moving iron assembly 400 further includes a connecting member 440, and the moving iron 410 and the valve core 420 are connected by the connecting member 440. Specifically, the elastic piece 430 is a circular piece, the outer periphery of the elastic piece 430 is connected with the housing 110, a through hole is provided in the center of the elastic piece 430, the connecting piece 440 is provided with a boss 441, the connecting piece 440 passes through the through hole to be connected with the moving iron 410, and the elastic piece 430 is clamped in a gap between the boss 441 and the moving iron 410. Specifically, the inner sidewall of the housing 110 may be provided with a positioning groove, so that the outer periphery of the elastic sheet 430 is clamped in the positioning groove for fixing. The movable iron 410 is connected through the through hole of the elastic piece 430 by the connecting piece 440, and the boss 441 of the connecting piece 440 clamps the elastic piece 430 between the movable iron 410 and the boss 441, so that the elastic piece 430 applies pressure to the movable iron 410 to the valve head 130, and the matching mode of the elastic piece 430 and the movable iron 410 ensures that the linearity and hysteresis performance of a current flow curve are excellent, and the flow control of the proportional electromagnetic valve is accurate.

Further, as shown in fig. 2, the stationary iron 210, the moving iron 410, the valve body 420, and the valve head 130 are disposed along the same axis. The elastic sheet 430 provides pressure to the moving iron 410 and also provides coaxiality of the moving iron 410 relative to the coil assembly 300 in the housing 110, so that when the moving iron 410 moves in the housing assembly 100, vertical movement vertically upwards and downwards can be ensured, contact with the housing 110 and the coil assembly 300 is avoided, friction force between the moving iron 410 and the coil assembly 300 is reduced or even eliminated, and vertical movement vertically upwards and downwards between the valve core 420 and the valve head 130 is also avoided at the lower half part of the moving iron assembly 400, so that the valve core 420 is prevented from contacting the valve head 130 at one side due to inclination, and linearity and hysteresis performance of a flow current curve are more excellent.

In an alternative embodiment, as shown in fig. 2 and 3, the moving iron assembly 400 further includes a diaphragm 450 and a pressing plate 460, the diaphragm 450 covers the end surface of the valve seat 120, the pressing plate 460 covers the connection between the diaphragm 450 and the valve seat 120, the connecting member 440 is connected to the valve core 420 through the diaphragm 450, and the diaphragm 450 is clamped in the gap between the boss 441 and the valve core 420. Wherein, the membrane 450 is a boundary between the first accommodating chamber 120 and the second accommodating chamber 110A. When the coil assembly 300 is energized, the input channel 120A communicates with the first receiving chamber 120B, and gas or liquid is input into the first receiving chamber 120B and then output through the output channel 120A.

Further, as shown in fig. 3, the connection member 440 is provided with a communication channel 440A, and the communication channel 440A is used for communicating the input channel 130A and the second accommodating chamber 110A. By providing the communication channel 440A in the connector 440, when the proportional solenoid valve is closed, the input channel 130A is communicated with the second accommodating cavity 110A, so that the gas or liquid is input into the second accommodating cavity 110A, and the sealing force on the valve head 130 is composed of the elastic sheet 430 and the back pressure of the fluid, so that the pre-pressure of the elastic sheet 430 can be reduced, and the sealing of the valve head 130 can be realized by using smaller elastic sheet force by means of the pressure in the communication channel 440A. Moreover, the initial precompression amount of the spring 430 is reduced, so that a larger space of spring compression stroke is matched with the electromagnetic force, and a longer flow curve and a maximum flow can be obtained. The back pressure type structure can be applied under different pressure working conditions, and because the pressure of the communication channel 440A and the back pressure can be mutually offset, the accurate control of the proportional electromagnetic valve is more convenient.

In an alternative embodiment, as shown in fig. 3, the valve core 420 further includes a sealing member 421, and the sealing member 421 is disposed at a portion of the valve core 420 abutting the valve head 130. Specifically, the material of the sealing member 421 includes, but is not limited to, a material having elasticity such as silicone rubber, etc. Since the valve core 420 is abutted against the valve head 130 when the proportional solenoid valve is closed for sealing the input channel 130A, the sealing member 421 is provided at the abutment portion, so that the sealing property is better when the valve core 420 is connected with the valve head 130, thereby improving the use stability of the proportional solenoid valve.

In an alternative embodiment, as shown in fig. 2, the valve head 130 and the valve seat 120 are connected by a screw pair, the valve head 130 is provided with a locking ring 131, and the locking ring 131 is used to lock or unlock the valve head 130 and the valve seat 120. By connecting the valve head 130 and the valve seat 120 through the screw thread pair, the valve head 130 is rotated to adjust the position of the valve head 130 on the valve seat 120, so that the pre-compression amount of the elastic sheet 430 is adjusted to adjust the initial sealing force of the moving iron assembly 400, the valve head 130 is rotated upwards, the sealing force is increased, and compared with the traditional proportional electromagnetic valve, the development and verification time period of the traditional proportional electromagnetic valve is reduced downwards. When the desired sealing force is determined, the valve head 130 can be fixed by the locking ring 131, and the valve head is unlocked by the locking ring 131 when adjustment is needed, so that the valve head has the advantage of convenient operation.

In an alternative embodiment, as shown in fig. 2, the static iron assembly 200 includes a static iron 210 and an adjusting rod 220, the static iron 210 is mounted on an end surface of the housing 110 far away from the valve head 130, the static iron 210 is provided with an adjusting through hole 210A, the adjusting rod 220 is movably disposed in the adjusting through hole 210A, one end of the adjusting rod 220 far away from the moving iron 410 is provided with an adjusting part, one end of the adjusting rod 220 facing the moving iron 410 is provided with an abutting part, and the abutting part is used for abutting the moving iron 410. In this embodiment, the adjusting lever 220 is connected to the stator 210 by a screw pair. By providing the adjustment hole 210A in the static iron 210, the adjustment rod 220 is disposed in the adjustment hole 210A, and the position of the adjustment rod 220 is set by the adjustment part, so that the abutting part can prevent the moving iron 410 and the static iron 210 from being completely contacted, because the electromagnetic force is large after the contact, and the hysteresis effect of the comparative example valve is large. The adjusting lever 220 can adjust the maximum stroke of the moving iron 410 by adjusting the position, thereby adjusting the maximum output flow, and having the advantages of improving the control precision and the adjustment convenience.

In an alternative embodiment, as shown in fig. 2, the coil assembly 300 includes a coil bobbin 320 and a coil 310, the coil bobbin 320 is disposed around the stationary iron 210, the coil 310 is disposed around the coil bobbin 320, a gap between an end of the coil bobbin 320 and the moving iron 410 is provided with a corrugated spring sheet 330, and the corrugated spring sheet 330 may fill the gap between the end of the coil bobbin 320 and the moving iron 410, preventing the coil bobbin 320 from sliding. By disposing the coil bobbin 320 around the static iron 210, the coil 310 is disposed on the coil bobbin 320, so that the static iron 210 applies electromagnetic force to the moving iron 430.

Further, as shown in fig. 2, the coil assembly 300 further includes a wire insert 340 and a lead 350, the housing 110 is provided with a mounting groove, the wire insert 340 is mounted in the mounting groove, and the lead 350 is connected to the coil 310 through the wire insert 340. The traditional proportional valve is characterized in that a waist-shaped hole is formed in the shell, and then a lead is led out, so that the mode is tedious and time-consuming. The embodiment of the invention adopts a unique wire outlet mode, the wire plug 340 is installed in the installation groove by arranging the installation groove in the shell 110, and the lead 350 is conveniently installed in the wire plug 340 to finish wiring, so that the invention has the advantages of convenient assembly and attractive appearance.

The proportional electromagnetic valve provided by the embodiment of the application has the following beneficial effects:

1. The split type manufacturing is adopted, the valve body assembly 100 is divided into the shell 110 and the valve seat 120, the processing difficulty is greatly reduced, the processing can be completed on a lathe, and the electromagnetic force sensed by the moving iron 410 is balanced through the elastic sheet 430, so that the linearity and hysteresis performance of a flow current curve are excellent, the opening degree of the input channel 130A is accurately controlled, the high-precision flow control requirement in multiple industries is met, and the split type valve has the advantages of high control precision and simplicity in processing.

2. The static iron 210, the moving iron 410, the valve core 420 and the valve head 130 are arranged along the same axis, so that the moving iron 410 is ensured to vertically move vertically up and down when moving in the shell assembly 100, contact with the shell 110 and the coil assembly 300 is avoided, friction force between the moving iron 410 and the coil assembly 300 is reduced or even eliminated, and vertical movement vertically up and down between the valve core 420 and the valve head 130 is also avoided, the valve core 420 is prevented from contacting the valve head 130 at one side due to inclination, and linearity and hysteresis performance of a flow current curve are more excellent.

3. The back pressure structure can be applied under different pressure working conditions, and because the pressure and the back pressure of the communication channel 440A can be mutually offset, the accurate control of the proportional electromagnetic valve is more convenient.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A proportional solenoid valve, comprising:

The valve body assembly (100), the valve body assembly (100) comprises a shell (110), a valve seat (120) and a valve head (130), the valve seat (120) is connected with the shell (110), the valve head (130) is movably arranged in the valve seat (120), the valve seat (120) is provided with a first accommodating cavity (120B), the shell (110) is provided with a second accommodating cavity (110A), the first accommodating cavity (120B) is communicated with the second accommodating cavity (110A), the valve head (130) is provided with an input channel (130A), the valve seat (120) is provided with an output channel (120A), and the input channel (130A) and the output channel (120A) are both communicated with the first accommodating cavity (120B);

A static iron assembly (200) and a coil assembly (300), the static iron assembly (200) being mounted to an end of the housing (110) remote from the valve head (130), the coil assembly (300) being disposed around the static iron assembly (200);

Move indisputable subassembly (400), move indisputable subassembly (400) movably set up in first holding chamber (120B) and second holding chamber (110A), move indisputable subassembly (400) including moving indisputable (410), case (420) and shell fragment (430), move indisputable (410) with case (420) are connected, case (420) movably butt in valve head (130) on input channel (130A), shell fragment (430) install in shell (110), move indisputable (410) with shell fragment (430) are connected, shell fragment (430) are used for right move indisputable (410) applys the orientation valve head (130) pressure.

2. The proportional solenoid valve of claim 1, wherein:

The movable iron assembly (400) further comprises a connecting piece (440), the movable iron (410) and the valve core (420) are connected through the connecting piece (440), the outer periphery of the elastic piece (430) is connected with the shell (110), a through hole is formed in the center of the elastic piece (430), a boss (441) is arranged on the connecting piece (440), the connecting piece (440) penetrates through the through hole and is connected with the movable iron (410), and the elastic piece (430) is clamped between the boss (441) and the movable iron (410).

3. The proportional solenoid valve of claim 2, wherein:

The movable iron assembly (400) further comprises a diaphragm (450) and a pressing plate (460), the diaphragm (450) is arranged on the end face of the valve seat (120) in a covering mode, the pressing plate (460) is arranged on the joint of the diaphragm (450) and the valve seat (120) in a covering mode, the connecting piece (440) is connected with the valve core (420) through the diaphragm (450), and the diaphragm (450) is arranged between the boss (441) and the valve core (420) in a clamping mode.

4. A proportional solenoid valve according to claim 3, wherein:

the connecting piece (440) is provided with a communication channel (440A), and the communication channel (440A) is used for communicating the input channel (130A) and the second accommodating cavity (110A).

5. The proportional solenoid valve of claim 1, wherein:

The valve core (420) further comprises a sealing piece (421), and the sealing piece (421) is arranged at the position where the valve core (420) abuts against the valve head (130).

6. The proportional solenoid valve of claim 1, wherein:

The valve head (130) is connected with the valve seat (120) through a screw thread pair, the valve head (130) is provided with a locking ring (131), and the locking ring (131) is used for locking or unlocking the valve head (130) and the valve seat (120).

7. The proportional solenoid valve of any one of claims 1-6, wherein:

The static iron assembly (200) comprises a static iron (210) and an adjusting rod (220), the static iron (210) is installed on the end face of the valve head (130) away from the shell (110), the static iron (210) is provided with an adjusting through hole (210A), the adjusting rod (220) is movably arranged in the adjusting through hole (210A), one end of the adjusting rod (220) away from the moving iron (410) is provided with an adjusting part, one end of the adjusting rod (220) facing the moving iron (410) is provided with an abutting part, and the abutting part is used for abutting the moving iron (410).

8. The proportional solenoid valve of claim 7, wherein:

The coil assembly (300) comprises a coil framework (320) and a coil (310), wherein the coil framework (320) is arranged around the static iron (210), the coil (310) is arranged around the coil framework (320), and a corrugated elastic sheet (330) is arranged between the end part of the coil framework (320) and the static iron (210).

9. The proportional solenoid valve of claim 8, wherein:

The coil assembly (300) further comprises a wire plug (340) and a lead wire (350), the housing (110) is provided with a mounting groove, the wire plug (340) is mounted in the mounting groove, and the lead wire (350) is connected with the coil (310) through the wire plug (340).

10. The proportional solenoid valve of claim 7, wherein:

The static iron (210), the moving iron (410), the valve core (420) and the valve head (130) are arranged along the same axis.