Electromagnetic proportional valve

Abstract

The invention relates to an electromagnetic proportional valve which comprises a valve body, an electromagnetic assembly, a movable iron core, a sealing unit, a limiting piece and a first elastic piece. The electromagnetic assembly drives the movable iron core when powered on and drives the sealing unit to move in the axial direction of the movable iron core so as to open the flow channel. In the axial direction of the movable iron core, the two opposite sides of the first elastic piece abut against the movable iron core and the limiting piece respectively. When the electromagnetic assembly drives the movable iron core to move, opposite force can be applied to the movable iron core through the first elastic piece, and then the variable quantity of the resultant force of the electromagnetic force borne by the movable iron core and the elastic force of the first elastic piece tends to be linear, so that the increase quantity of current and the flow form a linear relation; therefore, the flow control precision of the electromagnetic proportional valve is improved.

Description

Technical Field The invention belongs to the technical field of electromagnetic valves, and in particular relates to an electromagnetic proportional valve. Background Art

[0002] The electromagnetic proportional valve mainly includes a valve body, an electromagnetic component, a sealing component and an elastic part; the valve body has a flow channel that allows fluid to pass through the valve body; when the electromagnetic component is not energized, the sealing component is pressed against the sealing surface of the valve body under the action of the elastic part so as to seal the opening of the flow channel formed on the sealing surface; when the electromagnetic component is energized, the sealing component can be magnetically attracted, so that the sealing component overcomes the elastic force of the elastic part and moves away from the sealing component, thereby opening the flow channel.

[0003] By controlling the magnitude of the current, the magnitude of the electromagnetic force of the electromagnetic component on the sealing component can be controlled, thereby achieving control of the flow channel opening. The greater the current, the greater the electromagnetic force of the electromagnetic component, the greater the distance the sealing component moves away from the sealing surface, the greater the flow channel opening, and the greater the flow rate of the flow channel. Conversely, the smaller the flow channel opening, the smaller the flow channel flow rate.

[0004] However, the electromagnetic proportional valve in the prior art is difficult to meet the demand for high-precision flow control. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to provide an electromagnetic proportional valve in view of the problem that the electromagnetic proportional valve in the prior art is difficult to meet the demand for high-precision flow control.

[0006] In order to solve the above problems, on the one hand, the present invention provides an electromagnetic proportional valve, including 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 powered on, 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 powered off, the first elastic member can apply force to the sealing unit through the moving iron core so that the sealing unit closes the flow channel; the electromagnetic proportional valve also includes a limit member, which is connected to the valve body; in the axial direction of the moving iron core, the opposite sides of the first elastic member respectively contact the moving iron core and the limit member.

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

[0008] Optionally, a first avoidance hole is provided on the limit member; in the axial direction of the moving iron core, the first avoidance hole passes through the limit member; the moving iron core is inserted in the first avoidance hole; the first avoidance hole is a stepped hole, and the first elastic member abuts against the first step surface of the first avoidance hole.

[0009] Optionally, along the axial direction of the moving iron core, the first limiting hole includes a first section hole and a second section hole that are arranged and connected in sequence; when the electromagnetic assembly drives the moving iron core, the moving iron core moves along the direction from the first section hole to the second section hole; the aperture of the first section hole is larger than the aperture of the second section hole to form the first step surface.

[0010] Optionally, along the direction from the first section of holes to the second section of holes, the diameter of the second section of holes gradually decreases.

[0011] Optionally, the first elastic member is a spring sheet; the first elastic member is an annular structure and is sleeved 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 includes 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 member, and is used to press the sealing member onto the valve body so that the sealing member seals the flow channel.

[0013] Optionally, the connecting member 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 member are both installed in the installation cavity; a second avoidance hole is provided on the connecting member, and the sealing member can seal the flow channel from the second avoidance hole.

[0014] Optionally, 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 passed through the coil; the moving iron core is passed through the coil; when the electromagnetic assembly moves the moving iron core, the moving iron core is close to the static iron core.

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

[0016] In the electromagnetic proportional valve provided in the embodiment of the present invention, when the electromagnetic component drives the moving iron core to move, the first elastic member can be elastically deformed, so that the first elastic member can apply a reverse force to the moving iron core, which is conducive to making the change in the combined force of the electromagnetic force exerted on the moving iron core and the elastic force of the first elastic member tend to be linear, thereby facilitating the increase in current to be linearly related to the flow rate, thereby improving the flow control accuracy of the electromagnetic proportional valve. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a structural schematic diagram of an electromagnetic proportional valve provided by an embodiment of the present invention; Figure 2 is a cross-sectional view of an electromagnetic proportional valve provided by an embodiment of the present invention; Figure 3 1 is a schematic structural diagram of a valve body of an electromagnetic proportional valve provided in one embodiment of the present invention; Figure 4 is a cross-sectional view of a valve body of an electromagnetic proportional valve provided by an embodiment of the present invention; Figure 5 is a cross-sectional view of an electromagnetic component of an electromagnetic proportional valve provided in one embodiment of the present invention; Figure 6 It is a structural schematic diagram of a moving iron core of an electromagnetic proportional valve provided by an embodiment of the present invention; Figure 7 is a cross-sectional view of a moving iron core of an electromagnetic proportional valve provided in one embodiment of the present invention; Figure 8 is a structural schematic diagram of a first elastic member of an electromagnetic proportional valve provided by an embodiment of the present invention; Fig. 9 It is a structural schematic diagram of a limiter of an electromagnetic proportional valve provided in one embodiment of the present invention; Fig.10 is a cross-sectional view of a position limiting member of an electromagnetic proportional valve provided in one embodiment of the present invention; Fig.11 It is a schematic diagram of the deformation of the first elastic member when the electromagnetic assembly provided by an embodiment of the present invention magnetically attracts the iron core.

[0018] The reference numerals in the specification are as follows: 100. Solenoid proportional valve; 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 step surface; 154. Limiting groove; 16. Sealing surface; 17. Boss; 2. Electromagnetic assembly; 21. Shell; 211. Shell; 212. First cover plate; 213. Second cover plate; 214. Accommodating hole; 215. First through hole; 216. Second through hole; 22. Coil; 23. Static iron core; 24. Support member; 241. Support tube; 242. First partition plate; 243. Second partition plate; 244. Third partition plate; 25. First protrusion; 3. Moving iron core; 31. Step surface; 32. First section structure; 33. Second section structure; 34. Mounting hole; 341. Sixth section hole; 342. Seventh section hole; 35. Avoidance gap; 4. Sealing unit; 41. Sealing pad; 411. Sealing part; 412. Position limiting part; 42. Second elastic member; 43. Connecting member; 431. Second avoidance hole; 432. Second step surface; 433. Fourth section hole; 434. Fifth section hole; 44. Mounting cavity; 45. Gasket; 46. Third avoidance hole; 5. a first elastic member; 6. Limiting member; 61. First avoidance hole; 611. First step surface; 612. First section hole; 613. Second section hole; 614. Third section hole; 62. First column; 63. Second column; 7. Sealing ring. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] like Figures 1 to 8 As shown, in one embodiment, the electromagnetic proportional valve 100 includes a valve body 1, an electromagnetic assembly 2, a moving iron core 3, a sealing unit 4 and a first elastic member 5; wherein the electromagnetic assembly 2, the moving iron core 3, the sealing unit 4 and the first elastic member 5 are all connected to the valve body 1.

[0021] like Figure 2 As shown, the valve body 1 has a flow channel 11, and the flow channel 11 forms an opening on the outer surface of the valve body 1, and the fluid can pass through the valve body 1 from the flow channel 11. The fluid can be gas or liquid.

[0022] 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.

[0023] The electromagnetic assembly 2 can be connected to a power source to receive power from the power source, wherein the power source is a device independent of the electromagnetic proportional valve 100 .

[0024] The electromagnetic assembly 2 can drive the moving iron core 3 when powered on, so that the moving iron core 3 moves along its own axial direction. When the moving iron core 3 moves along its own axial direction, it can drive the sealing unit 4 to move along the axial direction of the moving iron core 3 to open the flow channel 11. The electromagnetic assembly 2 is powered on means that the power supply supplies power to the electromagnetic assembly 2.

[0025] In addition, when the electromagnetic assembly 2 drives the moving iron core 3 (that is, when the electromagnetic force of the electromagnetic assembly 2 drives the moving iron core 3 and causes the moving iron core 3 to move), the moving iron core 3 can exert force on the first elastic member 5 to elastically deform the first elastic member 5. During the process of the electromagnetic assembly 2 driving the moving iron core 3 to move, the elastic force generated by the deformation of the first elastic member 5 gradually increases.

[0026] When the moving iron core 3 is subjected to the electromagnetic force of the electromagnetic assembly 2 and is stationary, in the axial direction of the moving iron core 3, the elastic force of the first elastic member 5 and the electromagnetic force of the electromagnetic assembly 2 are balanced, that is, the resultant force on the moving iron core 3 in its axial direction is zero.

[0027] When the electromagnetic component 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 component 2 on the moving iron core 3; when the moving iron core 3 is subjected to the electromagnetic force of the electromagnetic component 2 and is stationary, the elastic force generated by the deformation of the first elastic member 5 may be smaller than (or equal to or greater than) the electromagnetic force of the electromagnetic component 2 on the moving iron core 3.

[0028] When the electromagnetic assembly 2 is powered off (ie, the electromagnetic assembly 2 is not powered by the power source), the first elastic member 5 can exert force on the sealing unit 4 through the moving iron core 3 so that the sealing unit 4 closes the flow channel 11 .

[0029] In one 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), that is, the electromagnetic assembly 2 can magnetically attract the moving iron core 3, thereby driving 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 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 away from the electromagnetic assembly 2.

[0030] like Figure 3 and Figure 4As shown, the valve body 1 has a first hole 12, a second hole 13 and a third hole 14, and the third hole 14 connects the first hole 12 and the second hole 13. The first hole 12 and the second hole 13 are arranged at intervals on the valve body 1, and both form openings on the outer surface of the valve body 1. One of the first hole 12 and the second hole 13 is an input hole, and the other of the first hole 12 and the second hole 13 is an output hole. The first hole 12 and the second hole 13 can be connected 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.

[0031] When working, the sealing unit 4 opens the flow channel 11 by opening the third hole 14; the sealing unit 4 seals the flow channel 11 by sealing the third hole 14. When the sealing unit 4 opens the flow channel 11, the first hole 12 and the second hole 13 can be connected 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 channel 11 to the first hole 12. When the sealing unit 4 closes the flow channel 11, the first hole 12 and the second hole 13 cannot be connected 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 flow from the third hole 14 to the first hole 12.

[0032] like Figure 2 and Figure 4 As shown, the valve body 1 is further provided with a fourth hole 15, which penetrates from the outer surface of the valve body 1 to communicate with 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.

[0033] When the electromagnetic component 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, thereby opening the flow channel 11 (and the third hole 14); when the electromagnetic component 2 is powered off, the first elastic member 5 can apply force to the moving iron core 3 to make the moving iron core 3 close to the sealing surface 16, thereby driving the sealing unit 4 close to the seal, and finally making the sealing unit 4 contact the sealing surface 16 to close the first opening, thereby sealing the flow channel 11 (and the third hole 14).

[0034] In addition, the third hole 14 can also be regarded as connecting the second hole 13 and the fourth hole 15. Since the fourth hole 15 is connected to the first hole 12, the third hole 14 is equivalent to connecting 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 connected to form the above-mentioned flow channel 11.

[0035] exist Figure 4In the example shown, the first hole 12 and the second hole 13 both extend radially 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 axial direction of the third hole 14 can be parallel to the axial direction of the moving iron core 3, wherein the two can be coaxially arranged; at the same time, the fourth hole 15 also extends along the axial direction of the moving iron core 3.

[0036] During operation, when the moving iron core 3 drives the sealing unit 4 to approach the electromagnetic assembly 2, the sealing unit 4 moves away from the sealing surface 16. At this time, the opening of the flow channel 11 increases, which can increase the flow rate of the fluid flowing through the flow channel 11 per unit time; when the moving iron core 3 drives the sealing unit 4 to move away from the electromagnetic assembly 2, the sealing unit 4 moves toward the sealing surface 16. At this time, the opening of the flow channel 11 decreases, which can reduce the flow rate of the fluid flowing through the flow channel 11 per unit time.

[0037] like Figure 3 As shown, in one embodiment, the valve body 1 is a rectangular parallelepiped structure, and the valve body 1 has a first surface, a second surface, a third surface, a fourth surface, a fifth surface and a sixth surface, and these six surfaces are all outer surfaces of the valve body 1, the first surface and the second surface are parallel and spaced apart, the third surface and the fourth surface are parallel and spaced apart, the fifth surface and the sixth surface are parallel and spaced apart, the first surface intersects with the third surface, the fourth surface, the fifth surface and the sixth surface respectively, the second surface intersects with the third surface, the fourth surface, the fifth surface and the sixth surface respectively, the third surface intersects with the fifth surface and the sixth surface, and the fourth surface intersects with the fifth surface and the sixth surface.

[0038] The first hole 12 and the second hole 13 may be arranged on the same surface of the valve body 1. For example, the first hole 12 and the second hole 13 may be arranged on the first surface, and the axial directions of the first hole 12 and the second hole 13 are 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.

[0039] The fourth hole 15 may be disposed on the sixth surface and extend toward the fifth surface without penetrating the fifth surface. The diameter of the fourth hole 15 may be greater than the diameter of the first hole 12 .

[0040] like Figure 4 As shown, in one embodiment, the valve body 1 further has a boss 17 , which is disposed on the bottom surface of the fourth hole 15 , and the third hole 14 extends from the inner surface of the second hole 13 to the surface of the boss 17 close to the opening of the fourth hole 15 .

[0041] The opening of the fourth hole 15 refers to the opening formed by the fourth hole 15 on the outer surface of the valve body 1, and specifically refers to the opening formed by the fourth hole 15 on the sixth surface. At this time, the surface of the boss 17 close to the opening of the fourth hole 15 (that is, the surface of the boss 17 close to the electromagnetic component 2) is the sealing surface 16.

[0042] The boss 17 is spaced apart from the inner side surface of the fourth hole 15 . The surface of the boss 17 close to the opening of the fourth hole 15 may be a plane, and the bottom surface of the fourth hole 15 may also be a plane.

[0043] Compared with the method of directly using the bottom surface of the fourth hole 15 as the sealing surface 16 (in this case, the boss 17 is not provided), the arrangement of this embodiment can reduce the size of the sealing surface 16, which is more conducive to the processing of the sealing surface 16, thereby facilitating the improvement of the control accuracy of the flow rate. For example, when the size of the sealing surface 16 is reduced, it is more conducive to ensuring the flatness of the sealing surface 16.

[0044] like Figure 4 As shown, in one embodiment, the boss 17 is a frustum 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 surface 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.

[0045] like Figure 2 Fig. 9 As shown, in one embodiment, the electromagnetic proportional valve 100 also includes a limit member 6, which is connected to the valve body 1; in the axial direction of the moving iron core 3, the opposite sides of the first elastic member 5 respectively contact the moving iron core 3 and the limit member 6; when the magnetic assembly 2 drives the moving iron core 3, in the radial direction of 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 limit member 6.

[0046] When the current passing through the electromagnetic component 2 is constant, the electromagnetic force changes gradually during the process of the electromagnetic component 2 driving the moving iron core 3 to move, and the trend of the change is nonlinear. That is, at the same displacement, the change amount of the electromagnetic force also changes gradually. For example, when the electromagnetic component 2 and the moving iron core 3 are attracted to each other, the moving iron core 3 gradually approaches the electromagnetic component 2, and when the electromagnetic component 2 magnetically attracts the moving iron core 3, the closer the moving iron core 3 is to the electromagnetic component 2, the greater the magnetic attraction of the electromagnetic component 2 to the moving iron core 3, and the greater the change amount of the magnetic attraction to the moving iron core 3 at the same displacement.

[0047] In this embodiment, the setting of the first elastic member 5 can reduce the change in the electromagnetic force of the electromagnetic assembly 2, which is conducive to making the change in the combined force of the electromagnetic force on the moving iron core 3 and the elastic force of the first elastic member 5 tend to be linear, which is conducive to making the increase in current linearly related to the flow rate, thereby improving the flow control accuracy of the electromagnetic proportional valve.

[0048] In addition, in the prior art, the elastic force of the elastic member is linearly related to the deformation, and its change cannot be coupled with the change of the electromagnetic force. In order to adjust the flow rate, it is necessary to adjust the movement distance of the moving iron core, that is, it is necessary to change the size of the current passed into the electromagnetic component. Since in the prior art, the change of the elastic force of the elastic member is not coupled with the change of the electromagnetic force, when the current passed into the electromagnetic component increases, the lifting process of the moving iron core is sometimes fast and sometimes slow, so that the flow rate is sometimes large and sometimes small, and cannot be linearly related to the increase of the current. In this embodiment, when the magnetic component 2 drives the moving iron core 3, in the radial direction of the moving iron core 3, the first elastic member 5 can also slide relative to at least one of the moving iron core 3 and the limit member 6, so that the lever arm of the first elastic member 5 can be adjusted, and then the stiffness of the first elastic member 5 can be adjusted, so that the increase of the first elastic member 5 is also nonlinear, and then the change of the combined force of the electromagnetic force on the moving iron core 3 and the elastic force of the first elastic member 5 is more linear, thereby further improving the flow control accuracy of the electromagnetic proportional valve.

[0049] When the electromagnetic component 2 magnetically attracts the moving iron core 3, in the radial direction of the moving iron core 3, the distance between the area where the first elastic member 5 is used to resist the moving iron core 3 and the area where the first elastic member 5 is used to resist the limit member 6 gradually decreases, so that the lever arm of the first elastic member 5 is reduced and the stiffness of the first elastic member 5 is increased. At the same deformation amount, the change in the elastic force of the first elastic member 5 becomes larger. The area where the first elastic member 5 is used to resist the moving iron core 3 is defined as the first area, and the area where the first elastic member 5 is used to resist the limit member 6 is defined as the second area; the portion of the first elastic member 5 located between the first area and the second area will produce elastic deformation. And this deformation can be: in the axial direction of the moving iron core 3, the first elastic member 5 bulges toward the side away from the electromagnetic component 2.

[0050] In the radial direction of the moving iron core 3, the distance between the area where the first elastic member 5 abuts against the moving iron core 3 and the area where the first elastic member 5 abuts against the stopper 6 may refer to: the distance between the middle position of the first area and the middle position of the second area in the radial direction of the moving iron core 3. Fig.11As shown, in the radial direction of the moving iron core, the spacing a1 between the middle position of the first region and the edge of the first region close to the first section structure 32 is equal to the spacing a2 between the middle position of the first region and the edge of the first region away from the first section structure 32. In the radial direction of the moving iron core, the spacing a3 between the middle position of the second region and the edge of the second region close to the first section structure 32 is equal to the spacing a4 between the middle position of the second region and the edge of the second region away from the first section structure 32. Of course, in other embodiments, in the radial direction of the moving iron core 3, the spacing between the area of ​​the first elastic member 5 used to abut the moving iron core 3 and the area of ​​the first elastic member 5 used to abut the limit 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.

[0051] refer to Fig.11 As shown, initially, in the radial direction of the moving iron core 3, the distance between the middle position of the first area and the middle position of the second area is d1. 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 between the middle position of the first area and the middle position of the second area is d2. Wherein, d2<d1.

[0052] In this embodiment, when the spacing between the first area and the second area decreases, the stiffness of the first elastic member 5 increases. Under the same conditions, when the first elastic member 5 produces the same deformation, the greater the stiffness of the first elastic member 5, the greater the increase in elastic force. Therefore, during the movement of the moving iron core 3 driven by the electromagnetic component 2 (specifically, during the movement of the moving iron core 3 by the electromagnetic component 2), the stiffness of the first elastic member 5 becomes larger and larger, and the elastic force generated by it at the same deformation amount becomes larger and larger. In this way, the change in the elastic force of the first elastic member 5 and the change in the electromagnetic force can be better coupled, which is conducive to making the increase in current linearly related to the flow rate, thereby improving the flow control accuracy of the electromagnetic proportional valve.

[0053] like Figure 2 and Figure 8 As shown, in one embodiment, the first elastic member 5 is a spring sheet; the first elastic member 5 is an annular structure and is sleeved on the moving iron core 3 .

[0054] In one embodiment, there is a distance between the inner side wall of the elastic sheet and the moving iron core 3 , so that the first elastic member 5 can move relative to the moving iron core 3 in the radial direction of the moving iron core 3 . exist Figure 8 In the example shown, the spring piece is a triangular ring structure, its cross section is triangular, and its ring hole is also a triangular hole. When the spring piece is sleeved on the moving iron core 3 (that is, the moving iron core 3 is inserted into the ring hole), if the moving iron core 3 is coaxial with the spring piece, the moving iron core 3 may not contact the inner side wall of the spring piece, that is, not contact the inner side surface of the ring hole.

[0055] Of course, in other embodiments, the spring piece may also be a circular ring structure, or the spring piece may also be a ring of other shapes.

[0056] In addition, in the axial direction of the moving iron core 3, the spring sheet has a first end face and a second end face arranged opposite to each other. After assembly, the axial direction of the spring sheet can be parallel to the axial direction of the moving iron core 3, the first end face contacts the moving iron core 3, and the second end face contacts the limiter 6.

[0057] The first end surface and the second end surface may both be planes, and the first end surface and the second end surface may be arranged in parallel. The spring piece may be made of metal material, such as steel, iron, etc.

[0058] like Figure 6 As shown, in one embodiment, the moving iron core 3 has a step surface 31 , and the first elastic member 5 abuts against the step surface 31 . Specifically, in the axial direction of the moving iron core 3, the moving iron core 3 includes a first section structure 32 and a second section structure 33 connected in sequence, wherein the diameter of the first section structure 32 is larger than the second section structure 33, and the surface of the first section structure 32 used to connect to the second section structure 33 is a step surface 31.

[0059] In addition, both the first section structure 32 and the second section structure 33 may be cylindrical structures, and the two may be coaxially arranged, and the axial direction of the first section structure 32 is the axial direction of the moving iron core 3 .

[0060] In other embodiments, the cross-section of the first section structure 32 may also be square, elliptical or other shapes; similarly, the cross-section of the second section structure 33 may also be square, elliptical or other shapes.

[0061] like Figure 5 As shown, in one embodiment, the electromagnetic assembly 2 includes a housing 21, a coil 22 and a static iron core 23; wherein the housing 21 is connected to the valve body 1; the coil 22 is installed in the housing 21; the static iron core 23 is installed on the housing 21 and is inserted into the coil 22. In addition, the moving iron core 3 is also inserted into the coil 22; when the electromagnetic assembly 2 drives the moving iron core 3, the moving iron core 3 is close to the static iron core 23, and at this time, the electromagnetic assembly 2 actually magnetically attracts the moving iron core 3. In addition, when the electromagnetic assembly 2 drives the moving iron core 3, the moving iron core 3 can move to contact the static iron core 23.

[0062] The moving iron core 3 being close to the electromagnetic assembly 2 can be regarded as the moving iron core 3 being close to the static iron core 23 , and the moving iron core 3 being far away from the electromagnetic assembly 2 can be regarded as the moving iron core 3 being far away from the static iron core 23 .

[0063] During operation, the electromagnetic force increases as the distance between the moving iron core 3 and the stationary iron core 23 decreases, and the change is nonlinear. Specifically, the smaller the distance between the two, the greater the change in the electromagnetic force of the electromagnetic assembly 2 when the moving iron core 3 moves the same distance close to the stationary iron core 23.

[0064] In one embodiment, the housing 21 is disposed on the sixth surface. Figure 5 As shown, the housing 21 includes a shell 211, a first cover plate 212 and a second cover plate 213; wherein the shell 211 is a structure with openings at both ends, and has a receiving hole 214, which passes through the shell 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 shell 211, and respectively close the receiving hole 214, the coil 22 is arranged in the receiving hole 214, and is located between the first cover plate 212 and the second cover plate 213.

[0065] In addition, the first cover plate 212 is located between the second cover plate 213 and the valve body 1 , and the static iron core 23 may be installed on the first cover plate 212 .

[0066] In one embodiment, the housing 211 is a cylindrical structure, which is conducive to evenly distributing the electromagnetic force in the housing 211 and improving the control effect on the moving iron core 3. In this embodiment, the housing 21 is a cylindrical structure.

[0067] In one embodiment, the first cover plate 212 and the second cover plate 213 are both disposed in the receiving hole 214 , and both may be interference fit with the receiving hole 214 , thereby achieving connection between the both and the housing 211 .

[0068] like Figure 5 As shown, the housing 21 also has a support member 24, which is arranged in the accommodating hole 214 and located between the first cover plate 212 and the second cover plate 213, and the first cover plate 212 and the second cover plate 213 both abut against the support member 24 so that the distance between the two cover plates is limited by the support member 24.

[0069] like Figure 5 As shown, in one embodiment, the support member 24 includes a support tube 241, a first partition plate 242, a second partition plate 243 and a third partition plate 244, wherein the first partition plate 242, the second partition plate 243 and the third partition plate 244 are all disposed on the support tube 241 and are sequentially arranged at intervals 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 from the first partition plate 242 to the third partition plate 244 is the direction from the first cover plate 212 to the second cover plate 213. After assembly, the first cover plate 212 may be in contact with the support tube 241 and / or the first cover plate 212, and the second cover plate 213 may be in contact with the support tube 241 and / or the third partition plate 244.

[0070] In addition, the surface of the first cover plate 212 away from the second partition plate 243 is flush with the end surface of the support tube 241, and the surface of the third cover plate away from the second partition plate 243 is flush with the end surface of the support tube 241. The support tube 241 may be a round tube structure or the like.

[0071] The coil 22 is wound on 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 supplies power to the coil 22 through the circuit.

[0072] In addition, a first wire passing hole is provided on the third partition plate 244, and the first wire passing hole passes through the third partition plate 244 along the axial direction of the moving iron core 3; a second wire passing hole is provided on the second cover plate 213, and the second wire passing hole 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 plate 244 from the first wire passing hole, and pass through the second cover plate 213 from the second wire passing hole, so as to be connected to the power supply.

[0073] In addition, a third wire hole is provided on the second partition plate 243, and the third wire hole penetrates the second partition plate 243 along the axial direction of the moving iron core 3. The conductive wire of the circuit can pass through the second partition plate 243 from the third wire hole to electrically connect the coil 22.

[0074] 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 a threaded connection. Specifically, both ends of the receiving hole 214 are provided with internal threads, and the sides of the first cover plate 212 and the second cover plate 213 are provided with external threads, and the external threads of the two 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.

[0075] like Figure 5 As shown, in one embodiment, the static 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 axial structure of the static iron core 23 is a stud structure, which cooperates with the threaded hole of the second cover plate 213, thereby realizing the threaded connection between the static iron core 23 and the second cover plate 213.

[0076] In addition, along the axial direction of the moving iron core 3, the first through hole 215 penetrates 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 static iron core 23 and the second cover plate 213 together.

[0077] like Figure 5As shown, the portion of the static iron core 23 between the second cover plate 213 and the first cover plate 212 may extend into the support tube 241, that is, 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 may be coaxially arranged.

[0078] like Figure 5 As shown, the first cover plate 212 is provided with a second through hole 216, and the second through hole 216 penetrates the first cover plate 212 along the axial direction of the moving iron core 3. The moving iron core 3 can extend into the tube hole of the support tube 241 through the second through hole 216.

[0079] like Figure 5 As shown, in one embodiment, a first protrusion 25 is provided on the surface (defined as the first surface) of the stationary iron core 23 close to the moving iron core 3. When the moving iron core 3 contacts the stationary iron core 23, the moving iron core 3 abuts on the first protrusion 25. Compared with the arrangement in which the moving iron core 3 abuts on the first surface, this can reduce the contact area between the moving iron core 3 and the stationary iron core 23, prevent the electromagnetic force from being too large when the moving iron core 3 and the stationary iron core 23 are attracted, and when the current passing into the coil 22 decreases, the moving iron core 3 can be detached from the stationary iron core 23 in time, effectively reducing the width of the hysteresis curve of the electromagnetic proportional valve 100.

[0080] It should be understood that, in the radial direction of the moving iron 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 more. When the number of the first protrusions 25 is more than one, 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, whose axial direction is parallel to the axial direction of the moving iron core 3.

[0081] Of course, in other embodiments, a second protrusion may be provided on the surface (defined as the second surface) of the moving iron core 3 close to the static iron core 23, so that when the moving iron core 3 contacts the static iron core 23, it is actually the second protrusion that contacts the static iron core 23, thereby reducing the contact area between the moving iron core 3 and the static iron core 23. It should be understood that in the radial direction of the moving iron core 3, the size of the first protrusion 25 is smaller than the size of the first surface. Among them, the number of the second protrusions can be one or more, and when the number of the second protrusions is more than one, each second protrusion is arranged at intervals. In addition, the second surface can be a plane, and the second protrusion can also be a cylindrical structure, and its axial direction is parallel to the axial direction of the moving iron core 3.

[0082] In other embodiments, a first protrusion 25 may be provided on the first surface, and a second protrusion may be provided on the second surface, so that when the moving iron core 3 and the stationary iron core 23 collide with each other, it is actually the first protrusion 25 and the second protrusion that collide with each other, thereby reducing the contact area between the moving iron core 3 and the stationary iron core 23.

[0083] like Figure 2As shown, in one embodiment, the stopper 6 and the valve body 1 may be threadedly connected. Specifically, the stopper 6 may be threadedly connected to the fourth hole 15. At this time, the inner side surface of the fourth hole 15 is provided with an internal thread, that is, in the axial direction of the moving iron core 3, at least a part of the fourth hole 15 is a threaded hole, and the outer side surface of the stopper 6 is provided with an external thread, that is, in the axial direction of the moving iron core 3, at least a part of the stopper 6 is a stud, and the stud is threadedly matched with the threaded hole part of the third hole 14, thereby realizing the installation of the stopper 6 on the valve body 1.

[0084] The limiter 6 and the valve body 1 are set to be threadedly connected, which is convenient for adjusting the axial position of the limiter 6 on the moving iron core 3. Since the first elastic member 5 is in contact between the limiter 6 and the moving iron core 3, when the axial position of the limiter 6 on the moving iron core 3 is adjusted, the elastic force of the first elastic member 5 can be adjusted. This is conducive to accurately controlling the gap between the static iron core 23 and the moving iron core 3 to ensure the consistency of the electromagnetic force of the electromagnet; this is also conducive to controlling the initial compression amount of the first elastic member 5 to be consistent and providing consistent elastic force. This is conducive to ensuring the consistency of the linear relationship between the flow rate 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 a single part, and reducing the production cost of the parts.

[0085] like Fig.10 As shown, in one embodiment, the position-limiting member 6 has a first avoidance hole 61; in the axial direction of the moving iron core 3, the first avoidance hole 61 penetrates the position-limiting member 6; the moving iron core 3 is arranged in the first avoidance hole 61, wherein the first avoidance hole 61 is a stepped hole, and the first elastic member 5 abuts against the first stepped surface 611 of the first avoidance hole 61. That is, the first elastic member 5 is located in the first avoidance hole 61, so that the position of the first elastic member 5 in the radial direction of the moving iron core 3 can be limited to a certain extent by the side wall of the first avoidance hole 61, which facilitates the installation of the first elastic member 5.

[0086] like Fig.10 As shown, along the axial direction of the moving iron core 3, the first avoidance hole 61 includes a first section hole 612 and a second section hole 613 which are sequentially arranged and connected; wherein, when the electromagnetic assembly 2 drives the moving iron core 3, the moving iron core 3 moves along the direction from the first section hole 612 to the second section hole 613, and the aperture of the first section hole 612 is larger than the aperture of the second section hole 613, so as to form the first step surface 611. After assembly, the first elastic member 5 is located in the first hole 12 and abuts against the first step surface 611.

[0087] The first step surface 611 may be a plane, and the first step surface 611 may be parallel to the step surface 31 of the moving iron core 3 .

[0088] In addition, the second section structure 33 of the moving iron core 3 may be located in the first section hole 612, and may 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 second section structure 33 and the inner side surface of the second section hole 613 may 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 second section structure 33 and the inner side surface of the second section hole 613 may be spaced apart, that is, the diameter of the second section structure 33 is smaller than the diameter of the second section hole 613.

[0089] Initially, the end face of the first elastic member 5 away from the electromagnetic assembly 2 (i.e., the first end face) abuts against the step face 31, and the end face of the first elastic member 5 close to the electromagnetic assembly 2 (i.e., the second end face) abuts against the first step face 611. At this time, the first elastic member 5 can be in an elastic deformation state or in an undeformed state. When the moving iron core 3 begins to move close to the electromagnetic assembly 2, the area of ​​the first elastic member 5 between the step face 31 and the first step face 611 is elastically deformed. At this time, the first end face can still maintain surface contact with the step face 31, and the second end face can still maintain surface contact with the first step face 611. However, the first elastic member 5 will slide, so that the inner side surface of the first elastic member 5 is away from the first section structure 32, and the outer side surface of the first elastic member 5 is close to the first section structure 32, so the distance d between the middle position of the first area and the middle position of the second area in the radial direction of the moving iron core will become smaller. Moreover, before the first elastic member 5 contacts the outer edge of the step surface 31 and the inner edge of the first step surface 611, the distance d between the middle position of the first area and the middle position of the second area in the radial direction of the moving iron core gradually decreases.

[0090] When the first elastic member 5 contacts the outer edge of the step surface 31, it can be regarded as the intersection of the outer side surface of the second section structure 33 (i.e., the radial surface of the moving iron core 3) and the step surface 31 (the intersection can be the intersection line of the two) contacts the first elastic member 5; when the first elastic member 5 contacts the inner edge of the first step surface 611, it can be regarded as the intersection of the inner side surface of the second section hole 613 and the first step surface 611 (the intersection can be the intersection line of the two) contacts the first elastic member 5. At this time, both the first area and the second area can be lines.

[0091] In some application scenarios, before the first elastic member 5 contacts the outer edge of the step surface 31 and the first elastic member 5 contacts the inner edge of the first step surface 611, the movement of the moving iron core 3 close to the electromagnetic assembly 2 may have moved to the maximum position. That is, before the first elastic member 5 contacts the outer edge of the step surface 31 and the first elastic member 5 contacts the inner edge of the first step surface 611, the moving iron core 3 contacts the stationary iron core 23.

[0092] In addition, the first area can be a circular ring area, the edge close to the first section structure 32 is its inner edge, the edge away from the first section structure 32 is its outer edge, the middle position of the first area is a circular line, the distance between the circular line and the inner edge of the first area is a1, and the distance between the circular line and the outer edge of the first area is a2. Similarly, the second area can be a circular ring area, the edge close to the first section structure 32 is its inner edge, the edge away from the first section structure 32 is its outer edge, the middle position of the second area is a circular line, the distance between the circular line and the inner edge of the second area is a3, and the distance between the circular line and the outer edge of the second area is a4.

[0093] In addition, when the moving iron core 3 moves close to the electromagnetic assembly 2, both the first area and the second area may be changed; or, when the moving iron core 3 moves close to the electromagnetic assembly 2, at least one of them may remain unchanged.

[0094] In actual operation, when the moving iron core 3 moves closer to the electromagnetic assembly 2 , the first elastic member 5 may also move into the second hole 613 . At this time, the first elastic member 5 may abut against the inner side surface of the second hole 613 .

[0095] In addition, the diameter of the second section hole 613 may be gradually reduced along the direction from the first section hole 612 to the second section hole 613. Specifically, the second section hole 613 may be a tapered hole.

[0096] In addition, the first section hole 612 may be a circular hole; the maximum cross-sectional radius of the second section hole 613 may be equal to the cross-sectional radius of the first section hole 612, and the first section hole 612 and the second section hole 613 may be coaxially arranged.

[0097] like Fig.10 As shown, in one embodiment, the first avoidance 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 , and can guide the movement of the moving iron core 3 approaching the electromagnetic assembly 2 .

[0098] 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 .

[0099] In addition, when the diameter of the second section hole 613 gradually decreases along the direction from the first section hole 612 to the second section hole 613, the minimum cross-sectional radius of the second section hole 613 may be equal to the cross-sectional radius of the third section hole 614. The third section hole 614 may be a circular hole; the minimum cross-sectional radius of the second section hole 613 may be equal to the cross-sectional radius of the third section hole 614, and the second section hole 613 and the third section hole 614 may be coaxially arranged.

[0100] In addition, the first avoidance hole 61 may also only have three hole segments, namely, the first hole segment 612, the second hole segment 613 and the third hole segment 614. Of course, in other embodiments, in addition to these three hole segments, the first avoidance hole 61 may also have other hole segments.

[0101] After assembly, the stopper 6 may also extend into the coil 22, specifically, into the support tube 241. In addition, the static iron core 23 may also extend into the third section hole 614, and may be sealed with the third section hole 614 to prevent the fluid in the second section hole 613 from leaking therebetween.

[0102] like Fig. 9 As shown, in one embodiment, in the axial direction of the moving iron core 3, the stopper 6 includes a first column 62 and a second column 63 connected in sequence, wherein the first column 62 is located on the side of the second column 63 away from the static iron core 23, that is, the first column 62 is located on the side of the second column 63 away from the electromagnetic assembly 2. At least a portion of the first column 62 is a stud, which is threadedly matched with the fourth hole 15, and the second column 63 extends into the support tube 241.

[0103] In addition, the first section hole 612 and the second section hole 613 are both arranged on the first column 62 , and the third section hole 614 is arranged on the second column 63 .

[0104] In addition, both the first column 62 and the second column 63 may be cylindrical structures, and the diameter of the first column 62 may be greater than the diameter of the second column 63. The first column 62 and the second column 63 may be coaxially arranged.

[0105] 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 separate structures.

[0106] In the prior art, the sealing unit is usually directly formed on the moving iron core 3 by encapsulation, and cannot be automatically aligned with the valve body 1 when the electromagnetic proportional valve 100 is assembled, resulting in uneven contact between the sealing unit and the sealing surface 16. In order to ensure reliable sealing, it is necessary to increase the pre-pressure of the first elastic member 5, which may have the following adverse effects: the area of ​​the sealing unit used to contact the sealing surface 16 is easily crushed due to overload, resulting in leakage; in order to overcome the increased pre-pressure of the first elastic member 5, it is necessary to increase the starting current to ensure the opening of the electromagnetic proportional valve 100.

[0107] In this regard, 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 through 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 arranged between the moving iron core 3 and the sealing member, and is used to press the sealing member onto the valve body 1 so that the sealing member seals the flow channel 11. In this way, the above-mentioned adverse effects can be effectively eliminated.

[0108] It should be understood that the sealing gasket 41 is movably connected to the moving iron core 3 through the connecting piece 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 .

[0109] like Figure 7 As shown, in one embodiment, the connector 43 is connected to the moving iron core 3 and encloses the moving iron core 3 to form a mounting cavity 44 ; a second avoidance hole 431 is provided on the connector 43 , and the sealing gasket 41 can seal the flow channel 11 from the second avoidance hole 431 . The connection member 43 and the moving iron core 3 may be threadedly connected. The second elastic member 42 may be a coil spring, and is disposed between the moving iron core 3 and the sealing pad 41. The sealing pad 41 may be a rubber pad.

[0110] like Figure 7 As shown, in one embodiment, the second avoidance hole 431 passes through the connecting member 43, and the second avoidance hole 431 is a stepped hole having a second stepped surface 432, and the sealing gasket 41 is pressed on the second stepped surface 432 by the second elastic member 42. Specifically, the second avoidance hole 431 includes a fourth section hole 433 and a fifth section hole 434 which are connected in sequence, and the aperture of the fourth section hole 433 is smaller than the aperture of the fifth section hole 434, so that the second stepped surface 432 is formed therebetween, and the fifth section hole 434 is a threaded hole, and at least a part of the moving iron core 3 is a stud, and the fifth section hole 434 cooperates with the stud part, thereby realizing the connection between the connecting member 43 and the moving iron core 3.

[0111] In addition, the stud portion of the moving iron core 3 may be located on the second section structure 33 , and the fourth section hole 433 may be a round hole, a square hole, or the like.

[0112] 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 assembly 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 in the mounting hole 34, and the second elastic member 42 abuts against the bottom surface of the mounting hole 34.

[0113] like Figure 7As shown, in one embodiment, the sealing unit 4 further includes a gasket 45, which is disposed 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, so that the gasket 45 is pressed 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 increased. The gasket 45 can be made of metal.

[0114] like Figure 7 As shown, in one embodiment, a third avoidance hole 46 is further provided on the side wall of the installation cavity 44, and the third avoidance hole 46 penetrates the side wall of the installation cavity 44, and at least a part of the third avoidance hole 46 is located on the side of the sealing gasket 41 away from the fourth section hole 433. Among them, the axial direction of the fourth section hole 433 is a 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, and the axial direction of the third avoidance hole 46 is a hole extending along the radial direction of the moving iron core 3, and the axial direction of the third avoidance hole 46 can be perpendicular to the axial direction of the moving iron core 3.

[0115] In addition, the third avoidance hole 46 may be provided on the side wall of the mounting hole 34 .

[0116] like Figure 7 As shown, in one embodiment, in the axial direction of the moving iron core 3, the sealing gasket 41 includes a sealing portion 411 and a limiting portion 412, the sealing portion 411 is connected to the limiting portion 412, and the sealing portion 411 is located on the side of the limiting portion 412 away from the electromagnetic assembly 2, and at this time, the sealing portion 411 is located between the second step surface 31 and the limiting portion 412.

[0117] The sealing portion 411 may be a cylindrical structure, and its radius is greater than the radius of the fourth section hole 433 .

[0118] In addition, the second elastic member 42 is a coil spring, and the limiting portion 412 is disposed inside 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 portion 412 can also be a cylindrical structure, and the sealing portion 411 and the limiting portion 412 can be coaxially arranged.

[0119] When a gasket 45 is provided between the sealing gasket 41 and the second elastic member 42, the gasket 45 is an annular structure, is sleeved on the limiting portion 412, and contacts the sealing portion 411. When no gasket 45 is provided between the sealing gasket 41 and the second elastic member 42, the second elastic member 42 can directly contact the sealing portion 411.

[0120] like Figure 7As shown, in one 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 in the sequence of the seventh section hole 342 away from the electromagnetic assembly 2, the sixth section hole 341 is connected to the seventh section hole 342, 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 prevent the second limiting member 6 from moving in the radial direction of the moving iron core 3.

[0121] 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 may 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 may be coaxially arranged, and the sixth section hole 341 and the moving iron core 3 may be coaxially arranged.

[0122] like Figure 6 As shown, the moving iron core 3 is further provided with an avoidance notch 35. In actual scenarios, the size of the moving iron core 3 is reduced. During assembly, a clamping device such as tweezers can be used to clamp the moving iron core 3 at the avoidance notch 35 to install the moving iron core 3. The avoidance notch 35 can be an annular groove, which is provided on the second section structure 33 and can be coaxial with the second section structure 33.

[0123] like Figure 2 As shown, in one embodiment, the electromagnetic proportional valve 100 also 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 on the side of the sixth hole 152 away from the electromagnetic assembly 2, the fifth hole 151 is connected to the sixth hole 152, and a third step surface 153 is formed between the fifth hole 151 and the sixth hole 152, and specifically, the aperture of the fifth hole 151 is smaller than the aperture of the sixth hole 152. After assembly, the limit member 6 extends into the sixth hole 152 and presses the sealing ring 7 onto the third step surface 153. Specifically, the second section structure 33 cooperates with the sixth hole 152 and presses the sealing ring 7 onto the third step surface 153 In one embodiment, an inner side surface 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 matched with the sixth hole 152 .

[0124] like Figure 2 and Figure 4As shown, a limiting groove 154 is provided on the inner side surface of the sixth hole 152. The limiting groove 154 is an annular groove, which is arranged around the limiting member 6. The sealing ring 7 is arranged in the limiting groove 154. After assembly, a part of the sealing ring 7 (defined as the first part) is located in the limiting groove 154, and the other part of the sealing ring 7 (defined as the second part) is located outside the limiting groove 154, and the limiting member 6 is pressed on the second part.

[0125] In addition, in the axial direction of the moving iron core 3, the side surface of the limiting groove 154 away from the electromagnetic assembly 2 may be flush with the third step surface 31, that is, the two are in the same plane. The longitudinal section of the limiting groove 154 may be rectangular.

[0126] In one embodiment, the limiting groove 154 and the sixth hole 152 may be coaxially arranged, and 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 may 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 both side surfaces of the limiting groove 154.

[0127] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic proportional valve, characterized in that: It includes a valve body, an electromagnetic assembly, a moving iron core, a sealing unit, a limiter 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 powered on, 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 powered off, the first elastic member can apply force to the sealing unit through the moving iron core, so that the sealing unit closes the flow channel; The limiting member is connected to the valve body; In the axial direction of the moving iron core, two opposite sides of the first elastic member respectively abut against the moving iron core and the limiting member.

2. The electromagnetic proportional valve according to claim 1, characterized in that: When the electromagnetic assembly magnetically attracts the moving iron core, in the radial direction of the moving iron core, the distance between the area of ​​the first elastic member used to abut against the moving iron core and the area of ​​the first elastic member used to abut against the limiting member gradually decreases.

3. The electromagnetic proportional valve according to claim 1, characterized in that: The limiting member is provided with a first avoidance hole; In the axial direction of the moving iron core, the first avoidance hole passes through the limiting member; The moving iron core is inserted into the first avoidance hole; The first avoidance hole is a stepped hole, and the first elastic member abuts against a first stepped surface of the first avoidance hole.

4. The electromagnetic proportional valve according to claim 3, characterized in that: Along the axial direction of the moving iron core, the first limiting hole includes a first section hole and a second section hole which are sequentially arranged and connected; When the electromagnetic assembly drives the moving iron core, the moving iron core moves along the direction from the first section hole to the second section hole; The aperture of the first section of holes is larger than the aperture of the second section of holes to form the first step surface.

5. The electromagnetic proportional valve according to claim 4, characterized in that: Along the direction from the first section of holes to the second section of holes, the aperture of the second section of holes gradually decreases.

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

7. The electromagnetic proportional valve according to claim 1, characterized in that: The sealing unit includes a sealing pad, a second elastic member and a connecting member; 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 disposed between the moving iron core and the sealing member, and is used to press the sealing member onto the valve body so that the sealing member seals the flow channel.

8. The electromagnetic proportional valve according to claim 7, characterized in that: The connecting piece 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 installed in the installation cavity; The connecting member is provided with a second avoidance hole, and the sealing member can seal the flow channel from the second avoidance hole.

9. The electromagnetic proportional valve according to claim 1, characterized in that: The electromagnetic assembly comprises a housing, a coil and a static iron core; The housing is connected to the valve body; The coil is installed in the housing; The static iron core is mounted on the housing and penetrates the coil; The moving iron core is inserted into the coil; When the electromagnetic assembly drives the moving iron core, the moving iron core approaches the static iron core.

10. The electromagnetic proportional valve according to claim 9, characterized in that: A first protrusion is provided on the surface of the static iron core close to the moving iron core; and / or a second protrusion is provided on the surface of the moving iron core close to the static iron core.

Images