Electromagnetic proportional valve

Abstract

The present application relates to a kind of electromagnetic proportional valve, including valve body, electromagnetic assembly, moving iron core, sealing unit, limiting piece and first elastic piece;Electromagnetic assembly drives moving iron core when energized, drives the sealing unit movement along the axial direction of moving iron core, to open flow passage;In the axial direction of moving iron core, the opposite sides of first elastic piece respectively resist moving iron core and the limiting piece resist;When electromagnetic assembly drives moving iron core movement, by first elastic piece, it can be to moving iron core exert counterforce, and then benefit to make the variation of the resultant force of electromagnetic force and the elasticity of first elastic piece that moving iron core receives tends to linear, to benefit to make the amount of increase of electric current and flow linearly related, to improve the flow control precision of electromagnetic proportional valve.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electromagnetic valves, and particularly relates to an electromagnetic proportional valve. BACKGROUND

[0002] The electromagnetic proportional valve mainly comprises a valve body, an electromagnetic assembly, a sealing assembly and an elastic member; the valve body has a flow channel through which fluid can pass; when the electromagnetic assembly is not electrified, the sealing assembly is abutted against a sealing surface of the valve body under the action of the elastic member, so as to seal an opening formed on the sealing surface by the flow channel; when the electromagnetic assembly is electrified, the sealing assembly can be magnetically attracted, so that the sealing assembly moves away from the sealing surface against the elastic force of the elastic member, and then the flow channel is opened.

[0003] By controlling the size of the current, the electromagnetic force of the electromagnetic assembly on the sealing assembly can be controlled, and then the control of the opening degree of the flow channel is realized. The greater the current is, the greater the electromagnetic force of the electromagnetic assembly is, the greater the distance of the movement of the sealing assembly away from the sealing surface is, the greater the opening degree of the flow channel is, and the greater the flow of the flow channel is. Conversely, the smaller the opening degree of the flow channel is, and the smaller the flow of the flow channel is.

[0004] However, the electromagnetic proportional valve in the prior art cannot meet the demand of high-precision flow control. SUMMARY

[0005] The present application aims to solve the problem that the electromagnetic proportional valve in the prior art cannot meet the demand of high-precision flow control.

[0006] In order to solve the above problems, on the one hand, the present application provides an electromagnetic proportional valve, which comprises a valve body, an electromagnetic assembly, a moving iron core, a sealing unit and a first elastic member; the valve body has a flow channel; the electromagnetic assembly is connected to the valve body and can drive the moving iron core when electrified, so that the moving iron core drives the sealing unit to move along the axial direction of the moving iron core to open the flow channel; when the electromagnetic assembly drives the moving iron core, the moving iron core can apply force to the first elastic member to make the first elastic member elastically deform; when the electromagnetic assembly is de-energized, the first elastic member can apply force to the sealing unit through the moving iron core to make the sealing unit close the flow channel; the electromagnetic proportional valve further comprises a limiting member connected to the valve body; in the axial direction of the moving iron core, the opposite sides of the first elastic member are respectively abutted against the moving iron core and the limiting member.

[0007] Optionally, when the electromagnetic assembly magnetically attracts the moving iron core, in the radial direction of the moving iron core, the distance between the region of the first elastic member abutting against the moving iron core and the region of the first elastic member abutting against the limiting member gradually decreases.

[0008] Optionally, the limiting member is provided with a first avoiding hole; the first avoiding hole penetrates the limiting member in the axial direction of the moving iron core; the moving iron core is arranged in the first avoiding hole; the first avoiding hole is a stepped hole, and the first elastic member abuts against the first stepped surface of the first avoiding hole.

[0009] Optionally, along the axial direction of the moving iron core, the first avoiding hole comprises a first segment hole and a second segment hole arranged in sequence and communicated; when the electromagnetic assembly drives the moving iron core, the moving iron core moves along the direction from the first segment hole to the second segment hole; the aperture of the first segment hole is larger than the aperture of the second segment hole, so as to form the first stepped surface.

[0010] Optionally, along the direction from the first segment hole to the second segment hole, the aperture of the second segment hole gradually decreases.

[0011] Optionally, the first elastic member is a spring sheet; the first elastic member is annular and arranged on the moving iron core; in the radial direction of the moving iron core, the first elastic member can move relative to the moving iron core.

[0012] Optionally, the sealing unit comprises a sealing gasket, a second elastic member and a connecting member; the sealing gasket is connected to the moving iron core through the connecting member and can move relative to the moving iron core along the axial direction of the moving iron core; the second elastic member is arranged between the moving iron core and the sealing gasket and used to press the sealing gasket against the valve body, so that the sealing gasket seals the flow channel.

[0013] Optionally, the connecting member is connected to the moving iron core and encloses the moving iron core to form a mounting cavity; the second elastic member and the connecting member are both arranged in the mounting cavity; the connecting member is provided with a second avoiding hole, and the sealing gasket can seal the flow channel from the second avoiding hole.

[0014] Optionally, the electromagnetic assembly comprises a housing, a coil and a static iron core; the housing is connected to the valve body; the coil is arranged in the housing; the static iron core is arranged on the housing and penetrates the coil; the moving iron core penetrates the coil; when the electromagnetic assembly drives the moving iron core, the moving iron core is close to the static iron core.

[0015] Optionally, the static iron core is provided with a first protrusion on the surface close to the moving iron core; and / or, the moving iron core is provided with a second protrusion on the surface close to the static iron core.

[0016] In the electromagnetic proportional valve provided by the embodiment of the present application, when the electromagnetic assembly drives the moving iron core to move, the first elastic member can be elastically deformed, so that the first elastic member can exert a reverse force on the moving iron core, and then the variation amount of the resultant force of the electromagnetic force and the elastic force of the first elastic member acting on the moving iron core tends to be linear, so as to facilitate the linear relationship between the current increment and the flow, thereby improving the flow control precision of the electromagnetic proportional valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structure schematic view of an electromagnetic proportional valve provided by an embodiment of the present application;

[0018] Figure 2 is a sectional view of the electromagnetic proportional valve provided by the embodiment of the present application;

[0019] Figure 3 is a structure schematic view of a valve body of the electromagnetic proportional valve provided by the embodiment of the present application;

[0020] Figure 4 is a sectional view of the valve body of the electromagnetic proportional valve provided by the embodiment of the present application;

[0021] Figure 5 is a sectional view of an electromagnetic assembly of the electromagnetic proportional valve provided by the embodiment of the present application;

[0022] Figure 6 is a structure schematic view of a moving iron core of the electromagnetic proportional valve provided by the embodiment of the present application;

[0023] Figure 7 is a sectional view of the moving iron core of the electromagnetic proportional valve provided by the embodiment of the present application;

[0024] Figure 8 is a structure schematic view of a first elastic member of the electromagnetic proportional valve provided by the embodiment of the present application;

[0025] Figure 9 is a structure schematic view of a limiting member of the electromagnetic proportional valve provided by the embodiment of the present application;

[0026] Figure 10 is a sectional view of the limiting member of the electromagnetic proportional valve provided by the embodiment of the present application;

[0027] Figure 11 is a deformation schematic view of the first elastic member when the electromagnetic assembly attracts the moving iron core.

[0028] The reference signs in the specification are as follows:

[0029] 100, electromagnetic proportional valve;

[0030] 1. Valve body; 11. Flow channel; 12. First hole; 13. Second hole; 14. Third hole; 15. Fourth hole; 151. Fifth hole; 152. Sixth hole; 153. Third stepped surface; 154. Limiting groove; 16. Sealing surface; 17. Boss;

[0031] 2. Electromagnetic component; 21. Housing; 211. Shell; 212. First cover plate; 213. Second cover plate; 214. Receiving hole; 215. First through hole; 216. Second through hole; 22. Coil; 23. Stationary iron core; 24. Support component; 241. Support tube; 242. First partition; 243. Second partition; 244. Third partition; 25. First protrusion;

[0032] 3. Moving iron core; 31. Stepped surface; 32. First section structure; 33. Second section structure; 34. Mounting hole; 341. Sixth section hole; 342. Seventh section hole; 35. Clearance notch;

[0033] 4. Sealing unit; 41. Sealing gasket; 411. Sealing part; 412. Limiting part; 42. Second elastic element; 43. Connecting part; 431. Second clearance hole; 432. Second stepped surface; 433. Fourth section hole; 434. Fifth section hole; 44. Mounting cavity; 45. Gasket; 46. Third clearance hole;

[0034] 5. First elastic element;

[0035] 6. Limiting component; 61. First clearance hole; 611. First stepped surface; 612. First section hole; 613. Second section hole; 614. Third section hole; 62. First column; 63. Second column;

[0036] 7. Sealing ring. Detailed Implementation

[0037] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] like Figures 1 to 8 As shown, in one embodiment, the electromagnetic proportional valve 100 includes a valve body 1, an electromagnetic component 2, a moving iron core 3, a sealing unit 4, and a first elastic element 5; wherein the electromagnetic component 2, the moving iron core 3, the sealing unit 4, and the first elastic element 5 are all connected to the valve body 1.

[0039] like Figure 2 As shown, the valve body 1 has a flow channel 11, which forms an opening on the outer surface of the valve body 1, allowing fluid to pass through the valve body 1 from the flow channel 11. The fluid can be either a gas or a liquid.

[0040] The sealing unit 4 is connected to the moving iron core 3, and the sealing unit 4 can open and close the flow channel 11. When the sealing unit 4 opens the flow channel 11, the fluid can pass through the valve body 1 from the flow channel 11; when the sealing unit 4 closes the flow channel 11, the fluid cannot pass through the valve body 1 from the flow channel 11.

[0041] The electromagnetic assembly 2 can be connected to a power supply to receive power supply. The power supply is a device independent of the electromagnetic proportional valve 100.

[0042] The electromagnetic assembly 2 can drive the moving iron core 3 to move along the axis of the moving iron core 3 when the electromagnetic assembly 2 is powered on, and the moving iron core 3 can drive the sealing unit 4 to move along the axis of the moving iron core 3 to open the flow channel 11. The power on of the electromagnetic assembly 2 means that the power supply supplies power to the electromagnetic assembly 2.

[0043] In addition, when the electromagnetic assembly 2 drives the moving iron core 3 (i.e. the electromagnetic force of the electromagnetic assembly 2 drives the moving iron core 3 and makes the moving iron core 3 move), the moving iron core 3 can apply a force to the first elastic member 5 to elastically deform the first elastic member 5. During the movement of the moving iron core 3 driven by the electromagnetic assembly 2, the elastic force generated by the deformation of the first elastic member 5 gradually increases.

[0044] When the moving iron core 3 is at rest under the electromagnetic force of the electromagnetic assembly 2, the moving iron core 3 is balanced by the elastic force of the first elastic member 5 and the electromagnetic force of the electromagnetic assembly 2 in the axial direction of the moving iron core 3, i.e. the resultant force acting on the moving iron core 3 in the axial direction is zero.

[0045] When the electromagnetic assembly 2 just drives the moving iron core 3, the elastic force generated by the deformation of the first elastic member 5 is smaller than the electromagnetic force of the electromagnetic assembly 2 on the moving iron core 3; when the moving iron core 3 is at rest under the electromagnetic force of the electromagnetic assembly 2, the elastic force generated by the deformation of the first elastic member 5 can be smaller than (or equal to or greater than) the electromagnetic force of the electromagnetic assembly 2 on the moving iron core 3.

[0046] When the electromagnetic assembly 2 is powered off (i.e. the power supply does not supply power to the electromagnetic assembly 2), the first elastic member 5 can apply a force to the sealing unit 4 through the moving iron core 3 to close the flow channel 11.

[0047] In an embodiment, when the electromagnetic assembly 2 is powered on, the electromagnetic force generated can attract the moving iron core 3 (the moving iron core 2 can be made of a permanent magnet), i.e. the electromagnetic assembly 2 can magnetically attract the moving iron core 3 to drive the moving iron core 3 to move. In this embodiment, when the electromagnetic assembly 2 just drives the moving iron core 3 to move, the moving iron core 3 can move close to the electromagnetic assembly 2, thereby driving the sealing unit 4 to move close to the electromagnetic assembly 2; when the electromagnetic assembly 2 is powered off, the moving iron core 3 moves away from the electromagnetic assembly 2 under the action of the first elastic member 5, thereby driving the sealing unit 4 to move away from the electromagnetic assembly 2.

[0048] As shown in Figure 3 and Figure 4 The valve body 1 has a first hole 12, a second hole 13 and a third hole 14, the third hole 14 communicates the first hole 12 and the second hole 13. The first hole 12 and the second hole 13 are arranged on the valve body 1 in a spaced manner, and both form an opening on the outer surface of the valve body 1. One of the first hole 12 and the second hole 13 is an input hole, the other of the first hole 12 and the second hole 13 is an output hole, and the first hole 12 and the second hole 13 can be communicated through the third hole 14, so that the external fluid can flow into the valve body 1 from the input hole, and can flow out of the valve body 1 from the output hole.

[0049] In operation, the sealing unit 4 opens the flow passage 11 by opening the third hole 14; the sealing unit 4 seals the flow passage 11 by sealing the third hole 14. When the sealing unit 4 opens the flow passage 11, the first hole 12 and the second hole 13 can be communicated through the third hole 14, so that the fluid in the first hole 12 can flow from the third hole 14 to the second hole 13; of course, the fluid in the second hole 13 can also flow from the flow passage 11 to the first hole 12. When the sealing unit 4 seals the flow passage 11, the first hole 12 and the second hole 13 cannot be communicated through the third hole 14, so that the fluid in the first hole 12 cannot flow from the third hole 14 to the second hole 13; of course, the fluid in the second hole 13 cannot also flow from the third hole 14 to the first hole 12.

[0050] As shown in Figure 2 and Figure 4 The valve body 1 is further provided with a fourth hole 15, the fourth hole 15 penetrates the outer surface of the valve body 1 to communicate the first hole 12, the sealing unit 4 is located in the fourth hole 15, and the moving iron core 3 extends into the valve body 1 from the fourth hole 15. In addition, the fourth hole 15 has a sealing surface 16, and the third hole 14 forms a first opening on the sealing surface 16.

[0051] When the electromagnetic assembly 2 drives the moving iron core 3, the moving iron core 3 can drive the sealing unit 4 to move away from the sealing surface 16, so as to open the first opening, and then realize the opening of the flow passage 11 (and the third hole 14); when the electromagnetic assembly 2 is powered off, the first elastic member 5 can apply a force to the moving iron core 3, so that the moving iron core 3 approaches the sealing surface 16, and then drives the sealing unit 4 to approach the sealing surface, and finally makes the sealing unit 4 abut on the sealing surface 16 to close the first opening, and then realizes the sealing of the flow passage 11 (and the third hole 14).

[0052] In addition, the third hole 14 can also be regarded as communicating the second hole 13 and the fourth hole 15, since the fourth hole 15 communicates the first hole 12, therefore, the third hole 14 is equivalent to communicating the first hole 12 and the second hole 13. The first hole 12, the second hole 13, the third hole 14 and the fourth hole 15 are communicated to form the above-mentioned flow passage 11.

[0053] In Figure 4 In the shown example, the first hole 12 and the second hole 13 both extend along the radial direction of the moving iron core 3, and the axes of the first hole 12 and the second hole 13 can be parallel to each other; in addition, the axis of the third hole 14 can be parallel to the axis of the moving iron core 3, and the two can be coaxially arranged; meanwhile, the fourth hole 15 also extends along the axis of the moving iron core 3.

[0054] During operation, when the moving iron core 3 drives the sealing unit 4 to approach the electromagnetic assembly 2, the sealing unit 4 is away from the sealing surface 16, at this time, the opening of the flow channel 11 is increased, and the flow rate of the fluid flowing through the flow channel 11 per unit time can be increased; when the moving iron core 3 drives the sealing unit 4 to move away from the electromagnetic assembly 2, the sealing unit 4 approaches the sealing surface 16, at this time, the opening of the flow channel 11 is reduced, and the flow rate of the fluid flowing through the flow channel 11 per unit time can be reduced.

[0055] As Figure 3 shown, in an embodiment, the valve body 1 is a cuboid structure, the valve body 1 has a first surface, a second surface, a third surface, a fourth surface, a fifth surface and a sixth surface, the six surfaces are all outer surfaces of the valve body 1, the first surface and the second surface are parallel and arranged at intervals, the third surface and the fourth surface are parallel and arranged at intervals, the fifth surface and the sixth surface are parallel and arranged at intervals, the first surface intersects the third surface, the fourth surface, the fifth surface and the sixth surface respectively, the second surface intersects the third surface, the fourth surface, the fifth surface and the sixth surface respectively, the third surface intersects the fifth surface and the sixth surface, and the fourth surface intersects the fifth surface and the sixth surface.

[0056] The first hole 12 and the second hole 13 can both be arranged on the same surface of the valve body 1, for example, the first hole 12 and the second hole 13 can both be arranged on the first surface, and the axes of the first hole 12 and the second hole 13 are both parallel to the arrangement direction of the first surface and the second surface. In addition, the first hole 12 and the second hole 13 do not penetrate to the second surface.

[0057] The fourth hole 15 can be arranged on the sixth surface and extend towards the fifth surface without penetrating to the fifth surface. The hole diameter of the fourth hole 15 can be greater than the hole diameter of the first hole 12.

[0058] As Figure 4 shown, in an embodiment, the valve body 1 further has a boss 17, the boss 17 is arranged on the bottom surface of the fourth hole 15, and the third hole 14 extends from the inner surface of the second hole 13 and penetrates to the surface of the boss 17 close to the opening of the fourth hole 15.

[0059] The opening of the fourth hole 15 refers to the opening of the fourth hole 15 formed on the outer surface of the valve body 1, and specifically refers to the opening of the fourth hole 15 formed on the sixth surface. At this time, the surface of the boss 17 close to the opening of the fourth hole 15 (i.e., the surface of the boss 17 close to the electromagnetic assembly 2) is the sealing surface 16.

[0060] The boss 17 is arranged in a spaced manner with the inner side of the fourth hole 15, and the surface of the boss 17 close to the opening of the fourth hole 15 can be a plane, and the bottom surface of the fourth hole 15 can also be a plane.

[0061] Compared with the mode of directly taking the bottom surface of the fourth hole 15 as the sealing surface 16 (at this time, the boss 17 is not arranged), the arrangement of the present embodiment can reduce the size of the sealing surface 16, and is more conducive to the machining of the sealing surface 16, thereby being conducive to improving the control accuracy of the flow.

[0062] As shown in the drawings, Figure 4 In an embodiment, the boss 17 is a conical structure, and the cross-sectional radius of the boss 17 gradually increases along the direction from the opening of the fourth hole 15 to the bottom of the fourth hole 15. In addition, the boss 17 and the fourth hole 15 can be coaxially arranged, and the boss 17 and the third hole 14 can also be coaxially arranged.

[0063] As shown in the drawings, Figure 2 Figure 9 In an embodiment, the electromagnetic proportional valve 100 further comprises a limiting piece 6 connected to the valve body 1; in the axial direction of the moving iron core 3, the opposite sides of the first elastic piece 5 abut against the moving iron core 3 and the limiting piece 6, respectively; when the magnetic assembly 2 drives the moving iron core 3, in the radial direction of the moving iron core 3, the first elastic piece 5 can slide relative to at least one of the moving iron core 3 and the limiting piece 6.

[0064] In the case that the current flowing into the electromagnetic assembly 2 is constant, during the movement of the moving iron core 3 driven by the electromagnetic assembly 2, the electromagnetic force is gradually changed, and the trend of the change is nonlinear. That is, the change amount of the electromagnetic force is also gradually changed at the same displacement. For example, when the electromagnetic assembly 2 attracts the moving iron core 3, the moving iron core 3 gradually approaches the electromagnetic assembly 2. When the electromagnetic assembly 2 magnetically attracts the moving iron core 3, the closer the moving iron core 3 is to the electromagnetic assembly 2, the greater the magnetic attraction force of the electromagnetic assembly 2 to the moving iron core 3, and the greater the change amount of the magnetic attraction force of the moving iron core 3 at the same displacement.

[0065] In the present embodiment, the arrangement of the first elastic piece 5 can reduce the change amount of the electromagnetic force of the electromagnetic assembly 2, thereby facilitating the change amount of the resultant force of the electromagnetic force of the moving iron core 3 and the elastic force of the first elastic piece 5 to tend to be linear, thereby facilitating the linear relationship between the increase amount of the current and the flow, and thereby improving the flow control accuracy of the electromagnetic proportional valve.

[0066] In addition, in the prior art, the elastic force of the elastic member is linearly related to the deformation amount, and the change thereof cannot be coupled with the change of the electromagnetic force. In order to adjust the flow size, the movement distance of the moving iron core needs to be adjusted, that is, the size of the current input to the electromagnetic assembly needs to be changed. Since the change of the elastic force of the elastic member is not coupled with the change of the electromagnetic force in the prior art, when the current input to the electromagnetic assembly is increased, the lifting process of the moving iron core is fast and slow, and the flow is large and small, which cannot be linearly related to the increase of the current. In the embodiment, when the magnetic assembly 2 drives the moving iron core 3, the first elastic member 5 can slide relative to at least one of the moving iron core 3 and the limiting member 6 in the radial direction of the moving iron core 3. In this way, the lever arm of the first elastic member 5 can be adjusted, and the stiffness of the first elastic member 5 is further adjusted, so that the increase amount of the first elastic member 5 is also nonlinear, and the change amount of the resultant force of the electromagnetic force and the elastic force of the first elastic member 5 acting on the moving iron core 3 tends to be linear, thereby further improving the flow control precision of the electromagnetic proportional valve.

[0067] When the magnetic assembly 2 magnetically attracts the moving iron core 3, the distance between the region where the first elastic member 5 abuts against the moving iron core 3 and the region where the first elastic member 5 abuts against the limiting member 6 gradually decreases in the radial direction of the moving iron core 3. In this way, the lever arm of the first elastic member 5 is reduced, the stiffness of the first elastic member 5 is increased, and the change amount of the elastic force of the first elastic member 5 is increased at the same deformation amount.

[0068] The region where the first elastic member 5 abuts against the moving iron core 3 is defined as a first region, and the region where the first elastic member 5 abuts against the limiting member 6 is defined as a second region. The part of the first elastic member 5 between the first region and the second region will be elastically deformed. The deformation can be that the first elastic member 5 protrudes away from the magnetic assembly 2 in the axial direction of the moving iron core 3.

[0069] The distance between the region where the first elastic member 5 abuts against the moving iron core 3 and the region where the first elastic member 5 abuts against the limiting member 6 in the radial direction of the moving iron core 3 can refer to the distance between the middle position of the first region and the middle position of the second region in the radial direction of the moving iron core 3. Figure 11As shown, in the radial direction of the moving iron core, the distance a1 between the middle position of the first region and the edge of the first region close to the first segment structure 32 is equal to the distance a2 between the middle position of the first region and the edge of the first region far from the first segment structure 32. In the radial direction of the moving iron core 3, the distance a3 between the middle position of the second region and the edge of the second region close to the first segment structure 32 is equal to the distance a4 between the middle position of the second region and the edge of the second region far from the first segment structure 32. Of course, in other embodiments, in the radial direction of the moving iron core 3, the distance between the region of the moving iron core 3 that the first elastic member 5 abuts against and the region of the first elastic member 5 that abuts against the limiting member 6 can also refer to: in the radial direction of the moving iron core 3, the position of the first region closest to the moving iron core 3 and the position of the second region farthest from the moving iron core 3.

[0070] Reference Figure 11 As shown, initially, in the radial direction of the moving iron core 3, the distance d1 between the middle position of the first region and the middle position of the second region. After the electromagnetic assembly 2 drives the moving iron core 3 to move a certain distance, in the radial direction of the moving iron core 3, the distance d2 between the middle position of the first region and the middle position of the second region. Wherein, d2 < d1.

[0071] In this embodiment, when the distance between the first region and the second region decreases, the stiffness of the first elastic member 5 increases. Under the same conditions, the greater the stiffness of the first elastic member 5, the greater the amount of elastic force generated by the first elastic member 5 when the same deformation amount occurs. Therefore, during the movement of the moving iron core 3 driven by the electromagnetic assembly 2 (specifically, during the movement of the moving iron core 3 driven by the magnetic attraction of the electromagnetic assembly 2), the stiffness of the first elastic member 5 becomes larger and larger, and the elastic force generated by the first elastic member 5 under the same deformation amount becomes larger and larger. In this way, the change of the elastic force of the first elastic member 5 and the change of the electromagnetic force can be better coupled, thereby facilitating the linear relationship between the amount of current increase and the flow, thereby improving the flow control accuracy of the electromagnetic proportional valve.

[0072] As Figure 2 and Figure 8 As shown in an embodiment, the first elastic member 5 is a spring sheet; the first elastic member 5 is in an annular structure and is sleeved on the moving iron core 3.

[0073] In an embodiment, the inner side wall of the spring sheet and the moving iron core 3 have a distance, so that in the radial direction of the moving iron core 3, the first elastic member 5 can move relative to the moving iron core 3.

[0074] In Figure 8 the example shown, the spring sheet is a triangular ring structure, the cross section thereof is triangular, and the ring hole thereof is also a triangular hole. When the spring sheet is sleeved on the moving iron core 3 (i.e., the moving iron core 3 is arranged in the ring hole), if the moving iron core 3 is coaxial with the spring sheet, the moving iron core 3 can not contact the inner side wall of the spring sheet, i.e., not contact the inner side of the ring hole.

[0075] Of course, in other embodiments, the spring can also be a ring structure, or the spring can be a ring of other shapes.

[0076] In addition, the spring has a first end face and a second end face arranged opposite to each other in the axial direction of the moving iron core 3. After assembly, the axial direction of the spring can be parallel to the axial direction of the moving iron core 3, with the first end face abutting against the moving iron core 3 and the second end face abutting against the limiting member 6.

[0077] Both the first and second end faces can be planes, and they can be parallel to each other. The spring can be made of metal, such as steel or iron.

[0078] like Figure 6 As shown, in one embodiment, the moving iron core 3 has a stepped surface 31, and the first elastic member 5 abuts against the stepped surface 31.

[0079] Specifically, along the axial direction of the moving iron core 3, the moving iron core 3 includes a first segment structure 32 and a second segment structure 33 connected in sequence. The diameter of the first segment structure 32 is larger than that of the second segment structure 33, and the surface of the first segment structure 32 used to connect the second segment structure 33 is the stepped surface 31.

[0080] In addition, both the first segment 32 and the second segment 33 can be cylindrical structures, and they can be coaxially arranged. The axial direction of the first segment 32 is the same as the axial direction of the moving iron core 3.

[0081] In other embodiments, the cross-section of the first segment 32 may also be square, elliptical or other shapes; similarly, the cross-section of the second segment 33 may also be square, elliptical or other shapes.

[0082] like Figure 5 As shown, in one embodiment, the electromagnetic component 2 includes a housing 21, a coil 22, and a stationary iron core 23; wherein, the housing 21 is connected to the valve body 1; the coil 22 is installed inside the housing 21; the stationary iron core 23 is installed on the housing 21 and passes through the coil 22. Additionally, a moving iron core 3 also passes through the coil 22; when the electromagnetic component 2 drives the moving iron core 3, the moving iron core 3 approaches the stationary iron core 23, at which point the electromagnetic component 2 effectively magnetically attracts the moving iron core 3. Furthermore, when the electromagnetic component 2 drives the moving iron core 3, the moving iron core 3 can move to contact the stationary iron core 23.

[0083] In this context, the movement of the iron core 3 being close to the electromagnetic component 2 can be considered as the movement of the iron core 3 being close to the stationary iron core 23, and the movement of the iron core 3 being far away from the electromagnetic component 2 can be considered as the movement of the iron core 3 being far away from the stationary iron core 23.

[0084] In operation, the electromagnetic force increases with the decrease of the distance between the moving iron core 3 and the static iron core 23, and the change is nonlinear, specifically, the smaller the distance between the two is, the greater the change of the electromagnetic force of the electromagnetic assembly 2 is when the moving iron core 3 moves a same distance close to the static iron core 23.

[0085] In an embodiment, the shell 21 is arranged on the sixth surface. In addition, as shown in the figure, the shell 21 comprises a housing 211, a first cover plate 212 and a second cover plate 213; wherein the housing 211 is of an open-ended structure, has a receiving hole 214, and the receiving hole 214 penetrates through the housing 211 along the axial direction of the moving iron core 3, the first cover plate 212 and the second cover plate 213 are both connected to the housing 211 and respectively close the receiving hole 214, and the coil 22 is arranged in the receiving hole 214 and between the first cover plate 212 and the second cover plate 213. Figure 5

[0086] In addition, the first cover plate 212 is between the second cover plate 213 and the valve body 1, and the static iron core 23 can be mounted on the first cover plate 212.

[0087] In an embodiment, the housing 211 is of a cylindrical structure, which is beneficial to make the electromagnetic force in the housing 211 uniformly distributed and improve the control effect on the moving iron core 3. In this embodiment, the shell 21 is of a cylindrical structure.

[0088] In an embodiment, the first cover plate 212 and the second cover plate 213 are both arranged in the receiving hole 214, and both can be in interference fit with the receiving hole 214, thereby realizing the connection of the two with the housing 211.

[0089] As shown in the figure, the shell 21 further has a support 24, the support 24 is arranged in the receiving hole 214 and between the first cover plate 212 and the second cover plate 213, and the first cover plate 212 and the second cover plate 213 are both abutted on the support 24, so as to limit the distance between the two cover plates through the support 24. Figure 5

[0090] As shown in the figure, in an embodiment, the support 24 comprises a support tube 241, a first partition plate 242, a second partition plate 243 and a third partition plate 244, the first partition plate 242, the second partition plate 243 and the third partition plate 244 are all arranged on the support tube 241 and are sequentially and spaced arranged along the axial direction of the support tube 241, wherein the axial direction of the support tube 241 is the axial direction of the moving iron core 3. In addition, the direction of the first partition plate 242 to the third partition plate 244 is the direction of the first cover plate 212 to the second cover plate 213. After assembly, the first cover plate 212 can be abutted on the support tube 241 and / or the first cover plate 212, and the second cover plate 213 can be abutted on the support tube 241 and / or the third partition plate 244. Figure 5 ​​​

[0091] In addition, the surface of the first cover plate 212 facing away from the second partition plate 243 is flush with the end face of the support tube 241, and the surface of the third cover plate facing away from the second partition plate 243 is flush with the end face of the support tube 241. The support tube 241 can be a circular tube structure, etc.

[0092] The coil 22 is wound around the support tube 241 and is located between the first partition 242 and the second partition 243. After assembly, the coil 22 and the support tube 241 can be coaxially arranged. The aperture between the second partition 243 and the third partition 244 can be used to set a corresponding control circuit, which is electrically connected to the coil 22, and the power supply is provided to the coil 22 through the circuit.

[0093] In addition, the third partition 244 is provided with a first wire-passing hole, which passes through the third partition 244 along the axial direction of the moving iron core 3; the second cover plate 213 is provided with a second wire-passing hole, which passes through the second cover plate 213 along the axial direction of the moving iron core 3; the conductive wire of the circuit can pass through the third partition 244 through the first wire-passing hole and through the second cover plate 213 through the second wire-passing hole, so as to connect to the power supply.

[0094] In addition, the second partition 243 is provided with a third wire-passing hole, which passes through the second partition 243 along the axial direction of the moving iron core 3. The conductive wire of the circuit can pass through the second partition 243 through the third wire-passing hole to electrically connect the coil 22.

[0095] Of course, the first cover plate 212 and the second cover plate 213 can also be installed in the receiving hole 214 by means of threaded connection. Specifically, both ends of the receiving hole 214 are provided with internal threads, and both the first cover plate 212 and the second cover plate 213 are provided with external threads on their sides. The external threads of both can cooperate with the internal threads of the receiving hole 214, thereby realizing the threaded connection between the two cover plates and the receiving hole 214.

[0096] like Figure 5 As shown, in one embodiment, the stationary iron core 23 can be threadedly connected to the second cover plate 213. Specifically, the second cover plate 213 is provided with a first through hole 215, which is a threaded hole. A section of the stationary iron core 23 in the axial direction is a stud structure, which cooperates with the threaded hole of the second cover plate 213 to realize the threaded connection between the stationary iron core 23 and the second cover plate 213.

[0097] In addition, along the axial direction of the moving iron core 3, the first through hole 215 passes through the second cover plate 213, and the stud structure extends from the threaded hole to the side of the second cover plate 213 away from the first cover plate 212 and cooperates with the nut, thereby locking the stationary iron core 23 and the second cover plate 213 together.

[0098] like Figure 5As shown, the part of the static core 23 between the second cover plate 213 and the first cover plate 212 can extend into the support tube 241, i.e. into the tube hole of the support tube 241. In addition, the threaded hole on the second cover plate 213 and the tube hole of the support tube 241 can be coaxially arranged.

[0099] As shown, the first cover plate 212 is provided with a second through hole 216, which penetrates the first cover plate 212 along the axial direction of the moving core 3. The moving core 3 can extend into the tube hole of the support tube 241 from the second through hole 216. Figure 5 As shown, in an embodiment, the first protrusion 25 is arranged on the surface of the static core 23 close to the moving core 3 (defined as the first surface). When the moving core 3 contacts the static core 23, the moving core 3 abuts against the first protrusion 25. Compared with the arrangement mode that the moving core 3 abuts against the first surface, the contact area between the moving core 3 and the static core 23 can be reduced, which can prevent the electromagnetic force from being too large when the moving core 3 and the static core 23 are attracted, and can enable the moving core 3 to timely separate from the static core 23 when the current in the coil 22 is reduced, thereby effectively reducing the width of the hysteresis curve of the electromagnetic proportional valve 100.

[0100] Figure 5 It should be understood that, in the radial direction of the moving core 3, the size of the first protrusion 25 is smaller than the size of the first surface. The number of the first protrusions 25 can be one or multiple. When the number of the first protrusions 25 is multiple, the first protrusions 25 are arranged at intervals. In addition, the first surface can be a plane, and the first protrusion 25 can also be a cylindrical structure, the axial direction of which is parallel to the axial direction of the moving core 3.

[0101] Of course, in other embodiments, the second protrusion can also be arranged on the surface of the static core 23 close to the moving core 3 (defined as the second surface). When the moving core 3 contacts the static core 23, the first protrusion 25 actually contacts the second protrusion, thereby reducing the contact area between the moving core 3 and the static core 23. It should be understood that, in the radial direction of the moving core 3, the size of the first protrusion 25 is smaller than the size of the first surface. The number of the second protrusions can be one or multiple. When the number of the second protrusions is multiple, the second protrusions are arranged at intervals. In addition, the second surface can be a plane, and the second protrusion can also be a cylindrical structure, the axial direction of which is parallel to the axial direction of the moving core 3.

[0102] In other embodiments, the first protrusion 25 can be arranged on the first surface, and the second protrusion can be arranged on the second surface. When the moving core 3 contacts the static core 23, the first protrusion 25 actually contacts the second protrusion, thereby reducing the contact area between the moving core 3 and the static core 23.

[0103] As shown, the part of the static core 23 between the second cover plate 213 and the first cover plate 212 can extend into the support tube 241, i.e. into the tube hole of the support tube 241. In addition, the threaded hole on the second cover plate 213 and the tube hole of the support tube 241 can be coaxially arranged.

[0104] As shown, the part of the static core 23 between the second cover plate 213 and the first cover plate 212 can extend into the support tube 241, i.e. into the tube hole of the support tube 241. In addition, the threaded hole on the second cover plate 213 and the tube hole of the support tube 241 can be coaxially arranged. Figure 2 ​As shown in the drawings, in an embodiment, the limiting member 6 and the valve body 1 can be in threaded connection. Specifically, the limiting member 6 can be in threaded connection with the fourth hole 15, at this time, the inner side of the fourth hole 15 is provided with internal threads, that is, at least a portion of the fourth hole 15 in the axial direction of the moving iron core 3 is a threaded hole, and the outer side of the limiting member 6 is provided with external threads, that is, at least a portion of the limiting member 6 in the axial direction of the moving iron core 3 is a threaded stud, and the threaded stud is in threaded cooperation with the threaded hole portion of the third hole 14, thereby achieving the installation of the limiting member 6 on the valve body 1.

[0105] The threaded connection between the limiting member 6 and the valve body 1 facilitates the adjustment of the position of the limiting member 6 in the axial direction of the moving iron core 3, and since the first elastic member 5 abuts between the limiting member 6 and the moving iron core 3, adjusting the position of the limiting member 6 in the axial direction of the moving iron core 3 can adjust the elastic force of the first elastic member 5. This is conducive to accurately controlling the gap between the static iron core 23 and the moving iron core 3 and ensuring the consistency of the electromagnetic force of the electromagnet; this is also conducive to controlling the consistency of the initial compression amount of the first elastic member 5 and providing consistent elastic force. This is conducive to ensuring the consistency of the linear relationship between the flow and the current of the electromagnetic proportional valve 100, improving the flow control accuracy of the electromagnetic proportional valve, reducing the dimensional accuracy requirements of individual parts, and reducing the production cost of the parts.

[0106] As shown in the drawings, Figure 10 In an embodiment, the limiting member 6 has a first avoiding hole 61, the first avoiding hole 61 penetrates the limiting member 6 in the axial direction of the moving iron core 3, and the moving iron core 3 is arranged in the first avoiding hole 61, wherein the first avoiding hole 61 is a stepped hole, and the first elastic member 5 abuts on the first stepped surface 611 of the first avoiding hole 61. That is, the first elastic member 5 is located in the first avoiding hole 61, so that the sidewall of the first avoiding hole 61 can limit the position of the first elastic member 5 in the radial direction of the moving iron core 3, facilitating the installation of the first elastic member 5.

[0107] As shown in the drawings, Figure 10 Along the axial direction of the moving iron core 3, the first avoiding hole 61 includes a first segment hole 612 and a second segment hole 613 arranged in sequence and in communication; wherein when the electromagnetic assembly 2 drives the moving iron core 3, the moving iron core 3 moves in the direction from the first segment hole 612 to the second segment hole 613, the hole diameter of the first segment hole 612 is greater than the hole diameter of the second segment hole 613, so as to form the first stepped surface 611. After assembly, the first elastic member 5 is located in the first hole 12 and abuts on the first stepped surface 611.

[0108] Wherein the first stepped surface 611 can be a flat surface, and the first stepped surface 611 can be a stepped surface 31 parallel to the moving iron core 3.

[0109] In addition, the second section structure 33 of the moving iron core 3 can be located in the first section hole 612 and can move into the second section hole 613 when moving close to the electromagnetic assembly 2. When the second section structure 33 is located in the first section hole 612, the inner side surface of the second section hole 613 and the second section structure 33 can be spaced apart, that is, the diameter of the second section structure 33 is smaller than the diameter of the first section hole 612. When the second section structure 33 moves into the second section hole 613, the inner side surface of the second section hole 613 and the second section structure 33 can be spaced apart, that is, the diameter of the second section structure 33 is smaller than the diameter of the second section hole 613.

[0110] Initially, the end surface (i.e., the first end surface) of the first elastic member 5 away from the electromagnetic assembly 2 abuts against the stepped surface 31, and the end surface (i.e., the second end surface) of the first elastic member 5 close to the electromagnetic assembly 2 abuts against the first stepped surface 611. At this time, the first elastic member 5 can be in an elastically deformed state or in an undeformed state. When the moving iron core 3 starts to move close to the electromagnetic assembly 2, the first elastic member 5 elastically deforms in the region between the stepped surface 31 and the first stepped surface 611. At this time, the first end surface and the stepped surface 31 can still be in surface contact, and the second end surface and the first stepped surface 611 can still be in surface contact. However, the first elastic member 5 will slide, so that the inner side surface of the first elastic member 5 moves away from the first section structure 32, and the outer side surface of the first elastic member 5 moves close to the first section structure 32. Therefore, the distance d between the middle position of the first region and the middle position of the second region in the radial direction of the moving iron core will become smaller. Moreover, before the first elastic member 5 abuts against the outer edge of the stepped surface 31 and the first elastic member 5 abuts against the inner edge of the first stepped surface 611, the distance d between the middle position of the first region and the middle position of the second region in the radial direction of the moving iron core will gradually become smaller.

[0111] Here, when the first elastic member 5 abuts against the outer edge of the stepped surface 31, it can be regarded that the outer side surface (i.e., the surface in the radial direction of the moving iron core 3) of the second section structure 33 abuts against the first elastic member 5 at the intersection (which can be the intersection line) of the stepped surface 31. When the first elastic member 5 abuts against the inner edge of the first stepped surface 611, it can be regarded that the inner side surface of the second section hole 613 abuts against the first elastic member 5 at the intersection (which can be the intersection line) of the first stepped surface 611. At this time, the first region and the second region can both be lines.

[0112] In some application scenarios, before the first elastic member 5 abuts against the outer edge of the stepped surface 31 and the first elastic member 5 abuts against the inner edge of the first stepped surface 611, the moving iron core 3 can have already moved to the maximum position close to the electromagnetic assembly 2. That is, before the first elastic member 5 abuts against the outer edge of the stepped surface 31 and the first elastic member 5 abuts against the inner edge of the first stepped surface 611, the moving iron core 3 and the stationary iron core 23 abut against each other.

[0113] Alternatively, the first region can be a ring-shaped region, with its inner edge being the edge closest to the first segment 32 and its outer edge being the edge furthest from the first segment 32. A circular line is located at the center of the first region, with a distance a1 between this circular line and the inner edge of the first region, and a distance a2 between this circular line and the outer edge of the first region. Similarly, the second region can be a ring-shaped region, with its inner edge being the edge closest to the first segment 32 and its outer edge being the edge furthest from the first segment 32. A circular line is located at the center of the second region, with a distance a3 between this circular line and the inner edge of the second region, and a distance a4 between this circular line and the outer edge of the second region.

[0114] In addition, when the moving iron core 3 moves close to the electromagnetic component 2, both the first region and the second region can change; or, when the moving iron core 3 moves close to the electromagnetic component 2, at least one region can remain unchanged.

[0115] In actual operation, when the moving iron core 3 moves close to the electromagnetic component 2, the first elastic element 5 can also move into the second hole 613. At this time, the first elastic element 5 can abut against the inner side of the second hole 613.

[0116] Furthermore, along the direction from the first hole 612 to the second hole 613, the diameter of the second hole 613 can gradually decrease. Specifically, the second hole 613 can be a tapered hole.

[0117] Furthermore, the first hole 612 can be a circular hole; the maximum cross-sectional radius of the second hole 613 can be equal to the cross-sectional radius of the first hole 612, and the first hole 612 and the second hole 613 can be coaxially arranged.

[0118] like Figure 10 As shown, in one embodiment, the first clearance hole 61 further includes a third hole 614, which is located on the side of the second hole 613 away from the first hole 612. The third hole 614 can guide the movement of the moving iron core 3 toward the electromagnetic component 2.

[0119] Specifically, the second section structure 33 extends into the third section hole 614, and the third section hole 614 guides and limits the second section structure 33, thereby guiding the movement of the moving iron core 3.

[0120] Furthermore, as the diameter of the second hole 613 gradually decreases along the direction from the first hole 612 to the second hole 613, the minimum cross-sectional radius of the second hole 613 can be equal to the cross-sectional radius of the third hole 614. The third hole 614 can be a circular hole; the minimum cross-sectional radius of the second hole 613 can be equal to the cross-sectional radius of the third hole 614; and the second hole 613 and the third hole 614 can be coaxially arranged.

[0121] Furthermore, the first clearance hole 61 may also have only three hole segments: the first hole segment 612, the second hole segment 613, and the third hole segment 614. Of course, in other embodiments, the first clearance hole 61 may have other hole segments besides these three.

[0122] After assembly, the limiting member 6 can also extend into the coil 22, specifically into the support tube 241. In addition, the stationary iron core 23 can also extend into the third section hole 614 and can be sealed with the third section hole 614 to prevent the fluid in the second section hole 613 from leaking between the two.

[0123] like Figure 9 As shown, in one embodiment, along the axial direction of the moving iron core 3, the limiting member 6 includes a first column 62 and a second column 63 connected in sequence. The first column 62 is located on the side of the second column 63 away from the stationary iron core 23, that is, the first column 62 is located on the side of the second column 63 away from the electromagnetic component 2. At least a portion of the first column 62 is a stud, which is threaded into the fourth hole 15, and the second column 63 extends into the support tube 241.

[0124] In addition, the first hole 612 and the second hole 613 are both provided on the first column 62, and the third hole 614 is provided on the second column 63.

[0125] Furthermore, both the first column 62 and the second column 63 can be cylindrical structures, and the diameter of the first column 62 can be larger than the diameter of the second column 63. The first column 62 and the second column 63 can be coaxially arranged.

[0126] In one embodiment, the first column 62 and the second column 63 may be an integral structure, or the first column 62 and the second column 63 may be a separate structure.

[0127] In the prior art, the sealing unit is usually directly formed on the moving iron core 3 by rubber coating. During the assembly of the electromagnetic proportional valve 100, it cannot automatically align with the valve body 1, resulting in uneven contact between the sealing unit and the sealing surface 16. To ensure reliable sealing, the pre-pressure on the first elastic element 5 needs to be increased. This may have the following adverse effects: the area of ​​the sealing unit that contacts the sealing surface 16 is prone to overload and crushing, leading to leakage; to overcome the increased pre-pressure on the first elastic element 5, the starting current needs to be increased to ensure the opening of the electromagnetic proportional valve 100.

[0128] In this regard, such as Figure 7As shown, in one embodiment, the sealing unit 4 includes a sealing gasket 41, a second elastic member 42, and a connecting member 43; the sealing gasket 41 is connected to the moving iron core 3 via the connecting member 43 and can move relative to the moving iron core 3 along the axial direction of the moving iron core 3; the second elastic member 42 is disposed between the moving iron core 3 and the sealing gasket, and is used to press the sealing gasket onto the valve body 1, so that the sealing gasket seals the flow channel 11. This can effectively eliminate the above-mentioned adverse effects.

[0129] It should be understood that the sealing gasket 41 is movably connected to the moving iron core 3 through the connector 43, so that the moving iron core 3 can move relative to the moving iron core 3 along the axial direction of the moving iron core 3.

[0130] like Figure 7 As shown, in one embodiment, the connector 43 is connected to the moving iron core 3 and forms an installation cavity 44 with the moving iron core 3; the connector 43 is provided with a second clearance hole 431, and the sealing gasket 41 can seal the flow channel 11 from the second clearance hole 431.

[0131] The connecting member 43 and the moving iron core 3 can be threaded together. The second elastic member 42 can be a helical spring and is disposed between the moving iron core 3 and the sealing gasket 41. The sealing gasket 41 can be a rubber gasket.

[0132] like Figure 7 As shown, in one embodiment, the second clearance hole 431 penetrates the connector 43. The second clearance hole 431 is a stepped hole with a second stepped surface 432. The sealing gasket 41 is pressed onto the second stepped surface 432 by the second elastic member 42. Specifically, the second clearance hole 431 includes a fourth segment hole 433 and a fifth segment hole 434 connected in sequence. The diameter of the fourth segment hole 433 is smaller than the diameter of the fifth segment hole 434 so that a second stepped surface 432 is formed between them. The fifth segment hole 434 is a threaded hole, and at least a part of the moving iron core 3 is a stud. The fifth segment hole 434 mates with the stud, thereby realizing the connection between the connector 43 and the moving iron core 3.

[0133] In addition, the stud part of the moving iron core 3 can be located on the second section structure 33, and the fourth section hole 433 can be a round hole, a square hole, etc.

[0134] like Figure 7 As shown, in one embodiment, a mounting hole 34 is provided on the surface of the moving iron core 3 away from the electromagnetic component 2. After assembly, the mounting hole 34 is at least a part of the mounting cavity 44. The second elastic member 42 and the sealing gasket 41 are both located inside the mounting hole 34, and the second elastic member 42 abuts against the bottom surface of the mounting hole 34.

[0135] like Figure 7As shown in the drawings, in an embodiment, the sealing unit 4 further comprises a gasket 45, which is arranged between the sealing gasket 41 and the second elastic member 42, one end of the second elastic member 42 abuts against the bottom surface of the mounting hole 34, and the other end of the second elastic member 42 abuts against the gasket 45 to press the gasket 45 against the sealing gasket 41, thereby exerting force on the sealing gasket 41. In this way, the wear of the sealing gasket 41 can be reduced, and the service life can be improved. The gasket 45 can be made of metal.

[0136] As shown in the drawings, Figure 7 In an embodiment, the side wall of the mounting cavity 44 is further provided with a third avoiding hole 46, the third avoiding hole 46 penetrates through the side wall of the mounting cavity 44, and at least a part of the third avoiding hole 46 is located on the side of the sealing gasket 41 away from the fourth section hole 433. The fourth section hole 433 is an axial hole extending along the axial direction of the moving iron core 3, and the axial direction of the fourth section hole 433 can be parallel to the axial direction of the moving iron core 3. The third avoiding hole 46 is a radial hole extending along the radial direction of the moving iron core 3, and the axial direction of the third avoiding hole 46 can be perpendicular to the axial direction of the moving iron core 3.

[0137] In addition, the third avoiding hole 46 can be arranged on the side wall of the mounting hole 34.

[0138] As shown in the drawings, Figure 7 In an embodiment, in the axial direction of the moving iron core 3, the sealing gasket 41 comprises a sealing part 411 and a limiting part 412, the sealing part 411 is connected with the limiting part 412, and the sealing part 411 is located on the side of the limiting part 412 away from the electromagnetic assembly 2, at this time, the sealing part 411 is located between the second step surface 31 and the limiting part 412.

[0139] The sealing part 411 can be a cylindrical structure, and the radius of the sealing part 411 is greater than the radius of the fourth section hole 433.

[0140] In addition, the second elastic member 42 is a spiral spring, and the limiting part 412 is arranged in the second elastic member 42, so that the second elastic member 42 can guide the movement of the sealing gasket 41 in the axial direction of the moving iron core 3. In addition, the limiting part 412 can also be a cylindrical structure, and the sealing part 411 and the limiting part 412 can be coaxially arranged.

[0141] When the gasket 45 is arranged between the sealing gasket 41 and the second elastic member 42, the gasket 45 is an annular structure, the gasket 45 is sleeved on the limiting part 412 and abuts against the sealing part 411. When the gasket 45 is not arranged between the sealing gasket 41 and the second elastic member 42, the second elastic member 42 can directly abut against the sealing part 411.

[0142] As shown in the drawings, Figure 7As shown, in an embodiment, in the axial direction of the moving iron core 3, the mounting hole 34 includes a sixth section hole 341 and a seventh section hole 342 connected in sequence, the sixth section hole 341 is located away from the seventh section hole 342 in sequence from the electromagnetic assembly 2, the sixth section hole 341 and the seventh section hole 342 are in communication, the gasket 45 is arranged in the sixth section hole 341, at least a part of the second elastic member 42 is located in the seventh section hole 342, and the diameter of the seventh section hole 342 matches the diameter of the second limiting member 6 (specifically, the outer diameter of the second elastic member 42) to block the movement of the second limiting member 6 in the radial direction of the moving iron core 3.

[0143] In addition, the diameter of the sixth section hole 341 is greater than the diameter of the seventh section hole 342, and the diameter of the sixth section hole 341 is greater than or equal to the diameter of the sealing portion 411, the diameter of the limiting portion 412 is less than or equal to the diameter of the seventh section hole 342, and the diameter of the seventh section hole 342 can be equal to the diameter of the second elastic member 42 (specifically, the outer diameter of the second elastic member 42). After assembly, the sixth section hole 341, the seventh section hole 342, the second elastic member 42, the limiting portion 412, and the sealing portion 411 can be coaxially arranged, and the sixth section hole 341 and the moving iron core 3 can be coaxially arranged.

[0144] As shown in the figure, Figure 6 As shown, the moving iron core 3 is also provided with a relief notch 35, in actual scenarios, the size of the moving iron core 3 is reduced, and in order to facilitate assembly, the moving iron core 3 can be clamped at the relief notch 35 by using a clamping device such as tweezers for installation. Wherein, the relief notch 35 can be an annular groove, which is arranged on the second section structure 33 and can be coaxial with the second section structure 33.

[0145] As shown in the figure, Figure 2 As shown in the figure, in an embodiment, the electromagnetic proportional valve 100 further includes a sealing ring 7; in the axial direction of the moving iron core 3, the fourth hole 15 includes a fifth hole 151 and a sixth hole 152, wherein the fifth hole 151 is located away from the sixth hole 152 from the side of the electromagnetic assembly 2, the fifth hole 151 and the sixth hole 152 are in communication, and a third stepped surface 153 is formed between the fifth hole 151 and the sixth hole 152, and specifically, the hole diameter of the fifth hole 151 is smaller than the hole diameter of the sixth hole 152. After assembly, the limiting member 6 extends into the sixth hole 152 and presses the sealing ring 7 on the third stepped surface 153. Specifically, the second section structure 33 cooperates with the sixth hole 152 and presses the sealing ring 7 on the third stepped surface 153

[0146] In an embodiment, the inner side of the sixth hole 152 is provided with an internal thread, wherein the sixth hole 152 is equivalent to a threaded hole, and the second section structure 33 is threadedly connected with the sixth hole 152.

[0147] As shown in the figure, Figure 2 and Figure 4As shown, the inner side of the sixth hole 152 is provided with a limiting groove 154, which is an annular groove surrounding the limiting member 6. The sealing ring 7 is arranged in the limiting groove 154. After assembly, a part (defined as the first part) of the sealing ring 7 is located in the limiting groove 154, and another part (defined as the second part) of the sealing ring 7 is located outside the limiting groove 154. The limiting member 6 is pressed on the second part.

[0148] In addition, in the axial direction of the moving iron core 3, the side of the limiting groove 154 away from the electromagnetic assembly 2 can be flush with the third step surface 31, i.e., both are in the same plane. The longitudinal section of the limiting groove 154 can be rectangular.

[0149] In an embodiment, the limiting groove 154 and the sixth hole 152 can be coaxially arranged. In the radial direction of the moving iron core 3, the single-side depth of the limiting groove 154 is less than the single-side width of the sealing ring 7. In addition, in the axial direction of the moving iron core 3, the width of the limiting groove 154 can be less than or equal to the maximum thickness of the sealing ring 7. After assembly, in the axial direction of the moving iron core 3, the sealing ring 7 is in sealing contact with the two side surfaces of the limiting groove 154.

[0150] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as there is no contradiction.

[0151] The above description is only the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic proportional valve characterized by comprising: The valve body, the electromagnetic assembly, the moving iron core, the sealing unit, the limiting piece and the first elastic member are included. The valve body has a flow channel. The electromagnetic assembly is connected to the valve body and can drive the moving iron core when energized, so that the moving iron core drives the sealing unit to move along the axial direction of the moving iron core to open the flow channel. When the electromagnetic assembly drives the moving iron core, the moving iron core can apply force to the first elastic member to elastically deform the first elastic member. When the electromagnetic assembly is de-energized, the first elastic member can apply force to the sealing unit through the moving iron core to close the flow channel. The limiting piece is connected to the valve body. In the axial direction of the moving iron core, the opposite sides of the first elastic member respectively abut against the moving iron core and the limiting piece. When the electromagnetic assembly magnetically attracts the moving iron core, in the radial direction of the moving iron core, the distance between the area where the first elastic member abuts against the moving iron core and the area where the first elastic member abuts against the limiting piece gradually decreases. The limiting piece is provided with a first avoiding hole. In the axial direction of the moving iron core, the first avoiding hole penetrates through the limiting piece. The moving iron core is arranged in the first avoiding hole. The first avoiding hole is a stepped hole, and the first elastic member abuts against the first step surface of the first avoiding hole.

2. The electromagnetic proportional valve according to claim 1, characterized in that Along the axial direction of the moving iron core, the first avoiding hole includes a first segment hole and a second segment hole arranged in sequence and in communication. When the electromagnetic assembly drives the moving iron core, the moving iron core moves along the direction from the first segment hole to the second segment hole. The diameter of the first segment hole is larger than the diameter of the second segment hole to form the first step surface.

3. The electromagnetic proportional valve according to claim 2, characterized in that Along the direction from the first segment hole to the second segment hole, the diameter of the second segment hole gradually decreases.

4. The electromagnetic proportional valve according to claim 1, characterized in that The first elastic member is a spring piece. The first elastic member has an annular structure and is sleeved on the moving iron core.

5. The electromagnetic proportional valve according to claim 1, characterized in that The sealing unit includes a sealing gasket, a second elastic member and a connecting piece. The sealing gasket is connected to the moving iron core through the connecting piece and can move relative to the moving iron core along the axial direction of the moving iron core. The second elastic member is arranged between the moving iron core and the sealing gasket and is used to press the sealing gasket against the valve body so that the sealing gasket seals the flow channel.

6. The electromagnetic proportional valve according to claim 5, characterized in that The connecting piece is connected to the moving iron core and forms an installation cavity together with the moving iron core. The second elastic member and the connecting piece are both installed in the installation cavity. The connecting piece is provided with a second avoiding hole, and the sealing gasket can seal the flow channel from the second avoiding hole.

7. The electromagnetic proportional valve according to claim 1, characterized in that The electromagnetic assembly includes a shell, a coil and a static iron core. The shell is connected to the valve body. The coil is installed in the shell. The static iron core is installed on the shell and arranged in the coil. The moving iron core is arranged in the coil. When the electromagnetic assembly drives the moving iron core, the moving iron core is close to the static iron core.

8. The electromagnetic proportional valve according to claim 7, characterized in that The surface of the static iron core close to the moving iron core is provided with a first protrusion, and / or the surface of the moving iron core close to the static iron core is provided with a second protrusion.

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