A solenoid valve

Abstract

The present invention provides a solenoid valve, including a valve body component and a control component, the control component including a sleeve component, a moving iron core, a static iron core, a valve needle, a support member, a first spring and a second spring, the sleeve component, the valve body component and the static iron core are fixedly connected, the moving iron core can move axially relative to the sleeve component, the support member is located below a limiting portion of the valve needle, the support member can abut the limiting portion, one end of the first spring abuts the static iron core, the other end of the first spring abuts the support member, the support member abuts the moving iron core, one end of the second spring abuts the limiting portion, the other end of the second spring abuts the moving iron core, and the moving iron core can drive the valve needle to move axially. Compared with the background technology, the present invention optimizes the structure of the control component, one end of the second spring abuts the limiting portion of the valve needle, the other end of the second spring abuts the moving iron core, and the moving iron core can drive the valve needle to move axially. Compared with the background technology, the present invention optimizes the structure of the control component, one end of the second spring abuts the limiting portion of the valve needle, and the other end of the second spring abuts the moving iron core, so that the solenoid valve will not be affected by the spring force of the second spring when opening the valve, thereby improving the valve opening performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a solenoid valve. Background Art

[0002] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a solenoid valve in the background technology. Figure 1 As shown, the solenoid valve includes a valve body component 01, a piston component 02, a driving component 03 and a coil 04. The valve body component 01 includes a main valve opening 0111. The piston component 02 includes a piston 021, an upper sealing body 020 and a lower sealing body 022. The piston component 02 can move axially relative to the valve body component 01, and the lower sealing body 022 can abut against the main valve opening 0111. The driving component 03 includes a head 0311, a sleeve 031, a moving iron core 032, a static iron core 033 and a valve needle 034. A main spring 036 is provided between the moving iron core 032 and the static iron core 033, and a secondary spring 035 is provided between the head 0311 and the valve needle 034. The valve needle 034 can abut against the upper sealing body 020. In this structure, the opening process of the solenoid valve is as follows: the coil 04 is de-energized, and the moving iron core 032 moves upward under the spring force of the main spring 036, and drives the valve needle 034 to move upward. Since one end of the auxiliary spring 035 abuts against the valve needle 034, and the other end abuts against the head 0311, during the upward movement of the moving iron core 032, it not only needs to overcome its own gravity and the gravity of the valve needle 034 and the auxiliary spring 035, but also needs to overcome the spring force of the auxiliary spring 035, which affects the valve opening performance.

[0003] In view of this, how to optimize the structure of the solenoid valve and improve its valve opening performance is an issue that those skilled in the art need to consider. Summary of the invention

[0004] The solenoid valve provided by the present invention comprises a valve body component and a control component, wherein the control component comprises a sleeve component, a moving iron core, a static iron core, a valve needle, a support member, a first spring and a second spring, wherein the stiffness of the first spring is greater than the stiffness of the second spring, the sleeve component is fixedly connected to the valve body component, and the sleeve component is fixedly connected to the static iron core, the moving iron core is located in the sleeve component, and the static iron core is at least partially located in the sleeve component, the moving iron core can move axially relative to the sleeve component, the static iron core comprises a first axial through hole, and the valve needle passes through the first axial through hole, the support member is located below the limiting portion of the valve needle, and the support member can abut against the limiting portion, the first spring sleeves the valve needle, one end of the first spring abuts against the static iron core, and the other end of the first spring abuts against the support member, the support member abuts against the moving iron core, one end of the second spring abuts against the limiting portion, and the other end of the second spring abuts against the moving iron core, and the moving iron core can drive the valve needle to move axially.

[0005] The solenoid valve of this embodiment includes a valve body component and a control component, the control component includes a sleeve component, a moving iron core, a static iron core, a valve needle, a support member, a first spring and a second spring, the sleeve component, the valve body component and the static iron core are fixedly connected, the moving iron core can move axially relative to the sleeve component, the support member is located below the limiting portion of the valve needle, the support member can abut the limiting portion, one end of the first spring abuts the static iron core, the other end of the first spring abuts the support member, the support member abuts the moving iron core, one end of the second spring abuts the limiting portion, the other end of the second spring abuts the moving iron core, and the moving iron core can drive the valve needle to move axially. Compared with the background technology, the present invention optimizes the structure of the control component, one end of the second spring abuts the limiting portion of the valve needle, the other end of the second spring abuts the moving iron core, and the moving iron core can drive the valve needle to move axially. Compared with the background technology, the present invention optimizes the structure of the control component, one end of the second spring abuts the limiting portion of the valve needle, and the other end of the second spring abuts the moving iron core, so that the solenoid valve will not be affected by the spring force of the second spring when opening the valve, thereby improving the valve opening performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 : A schematic diagram of the structure of a solenoid valve in the background technology;

[0007] Figure 2 : A cross-sectional schematic diagram of a solenoid valve in an open valve state provided by the present invention;

[0008] Figure 3 : Figure 2 The enlarged schematic diagram of point I in the middle;

[0009] Figure 4 : Figure 2 A schematic cross-sectional view of the middle moving iron core;

[0010] Figure 5 : Figure 2 A schematic cross-sectional view of the static iron core;

[0011] Figure 6a : Figure 2 A schematic cross-sectional view of the middle valve needle;

[0012] Figure 6b : Figure 6a A three-dimensional view of the middle valve needle;

[0013] Figure 7 : Figure 2 Schematic cross-sectional view of the solenoid valve in the closed state.

[0014] Figure 2-Figure 7 Explanation of symbols:

[0015] 1-valve body component, 10-valve chamber, 101-upper chamber, 102-lower chamber;

[0016] 11-valve cover, 111-diaphragm portion, 1110-guide hole portion, 1111-communication hole, 112-downward extension portion;

[0017] 12-valve body, 121-main valve port, 122-fluid inlet, 123-fluid outlet, 124-upper extension;

[0018] 2-valve core component, 21-valve core body, 211-extension portion;

[0019] 22-seal body, 221-pilot valve port;

[0020] 3-control component, 31-casing component, 310-inner cavity of casing, 311-casing, 312-end cap;

[0021] 32-moving iron core, 320-second axial through hole, 321-second stepped hole portion;

[0022] 322 - third hole segment, 3220 - inner cavity of the third hole segment, 3221 - guide wall;

[0023] 323 - fourth hole segment, 3230 - inner cavity of the fourth hole segment, 3231 - reduced diameter hole segment;

[0024] 324-fifth hole section, 325-second step surface, 326-third step surface;

[0025] 33-static iron core, 330-first axial through hole, 331-first stepped hole portion;

[0026] 332 - first hole section, 3320 - inner cavity of the first hole section;

[0027] 333 - second hole segment, 3330 - inner cavity of the second hole segment;

[0028] 334-matching hole section, 335-first step surface, 336-first outer step portion;

[0029] 34-valve needle, 341-needle body, 3410-notch, 3411-matching section;

[0030] 3412-head, 3413-second outer step, 342-ring, 3421-limiting portion;

[0031] 35 - support member, 36 - first spring, 37 - second spring. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0033] Figure 2 A cross-sectional schematic diagram of a solenoid valve in an open valve state provided by the present invention; Figure 3 for Figure 2 The enlarged schematic diagram of point I in the middle; Figure 4 for Figure 2 A schematic cross-sectional view of the middle moving iron core; Figure 5 for Figure 2 A schematic cross-sectional view of the static iron core; Figure 6a for Figure 2 A schematic cross-sectional view of the middle valve needle; Figure 6b for Figure 6a A three-dimensional view of the middle valve needle; Figure 7 for Figure 2 Schematic cross-sectional view of the solenoid valve in the closed state.

[0034] like Figure 2 , Figure 3 The solenoid valve comprises a valve body component 1, a valve core component 2, and a control component 3, wherein the valve core component 2 is arranged in a valve chamber 10 of the solenoid valve.

[0035] In this embodiment, the valve body component 1 includes a valve cover 11 and a valve body 12. The valve cover 11 includes a lower extension 112. The valve body 12 includes a main valve opening 121 and an upper extension 124. The inner wall of the lower extension 112 is slidably matched with the outer wall of the valve core component 2, that is, the valve core component 2 can move axially relative to the valve cover 11 to abut the main valve opening 121. The outer wall of the lower extension 112 is provided with an external thread, and the inner wall of the upper extension 124 is provided with an internal thread. The valve cover 11 and the valve body 12 are fixed by screwing the external thread and the internal thread. The valve body 12 includes a fluid inlet 122 and a fluid outlet 123. When the solenoid valve is in the closed state (such as Figure 7 , combined with Figure 2 ), the valve chamber 10 includes an upper chamber 101 located above the valve core component 2 and a lower chamber 102 located below the valve core component 2, the lower chamber 102 is connected to the fluid inlet 122, and the main valve port of the main valve port part 121 is connected to the fluid outlet 123.

[0036] In this embodiment, the valve core component 2 is a piston, including a valve core body 21 and a sealing body 22. The sealing body 22 is made of plastic material and is provided with a pilot valve port 221. The valve core body 21 is provided with an upwardly extending extension 211, which is riveted to the sealing body 22 so that the valve core body 21 and the sealing body 22 are fixedly connected.

[0037] The control component 3 includes a sleeve component 31, a moving iron core 32, a static iron core 33, a valve needle 34, a support member 35, a first spring 36 and a second spring 37. The sleeve component 31 includes a sleeve 311 and a head 312. The sleeve 311 is made of a stainless steel pipe and has an inner cavity 310. The upper section of the sleeve 311 is welded and fixed to the head 312, and the lower section of the sleeve 311 is welded and fixed to the valve cover 11. The static iron core 33 is partially located in the inner cavity 310 of the sleeve 311. The lower section of the static iron core 33 includes a first outer step portion 336 with the step surface facing upward. The lower end of the sleeve 311 abuts against the first outer step portion 336, and the static iron core 33 abuts against the partition portion 111 of the valve cover 11. In this way, the static iron core 33 is also fixed by welding the sleeve 311 to the valve cover 11. The stationary iron core 33 includes a first axial through hole 330, and the valve needle 34 passes through the first axial through hole 330. The valve needle 34 can abut against the pilot valve port 221 of the valve core component 2. The moving iron core 32 is located in the inner cavity 310 of the sleeve 311, and the stationary iron core 33 is at least partially located in the inner cavity 310 of the sleeve 311. The moving iron core 32 is located between the head 312 and the stationary iron core 33, and the moving iron core 32 is located above the stationary iron core 33. The moving iron core 32 can move axially along the inner wall of the sleeve 311. Here, "the moving iron core 32 is located above the stationary iron core 33" means that the moving iron core 32 can be completely located above the stationary iron core 33, or partially located above the stationary iron core 33, that is, the moving iron core 32 can partially extend into the stationary iron core 33. In this embodiment, the support member 35 is a gasket, which is annular and sleeved outside the valve needle 34. The support member 35 is located below the limiting portion 3421 of the valve needle 34. The stiffness of the first spring 36 is greater than that of the second spring 37. The "stiffness" here refers to the load required for the spring to produce unit deformation, that is, the load required for the first spring 36 to produce unit deformation is greater than that of the second spring 37. The first spring 36 is disposed around the valve needle 34, one end of the first spring 36 abuts against the static iron core 33, the other end of the first spring 36 abuts against the support member 35, and the support member 35 abuts against the movable iron core 32. One end of the second spring 37 abuts against the limiting portion 3421 of the valve needle 34, and the other end of the second spring 37 abuts against the movable iron core 32.

[0038] This implementation optimizes the structure of the control component, with one end of the second spring abutting the limiting portion and the other end of the second spring abutting the moving iron core. Compared with the background technology, the solenoid valve will not be affected by the spring force of the second spring when opening the valve, thereby improving the valve opening performance. On the other hand, by providing a support member, the support member and the moving iron core as a whole play a role in driving the axial movement of the valve needle. At the same time, as a part, it is convenient to install the second spring and the valve needle, thereby facilitating product assembly.

[0039] Further, such as Figure 2 , Figure 7 As shown, when the coil (not shown) sleeved outside the sleeve 311 is energized, the moving iron core 32 and the static iron core 33 are attracted, the valve needle 34 abuts against the pilot valve port 221, and the valve core component 2 abuts against the main valve port 121, that is, the solenoid valve is in a closed state, and there is a preset distance L between the support member 35 and the limiting portion 3421 of the valve needle 34; when the coil is de-energized, the moving iron core 32 and the support member 35 move away from the static iron core under the spring force of the first spring 36. 33, after the movable iron core 32 and the support member 35 move the preset distance L, the support member 35 abuts against the limiting portion 3421, and drives the valve needle 34 to separate from the pilot valve port 221, the upper chamber 101 is connected with the fluid outlet through the pilot valve port of the pilot valve port 221, the upper chamber 101 forms a low pressure area, and the lower chamber 102 forms a high pressure area due to being connected with the fluid inlet 122, and the valve core component 2 is separated from the main valve port 121 under the action of the pressure difference force to open the valve. By setting the preset distance L, in the initial stage of the solenoid valve opening, the movable iron core 32 and the support member 35 as a whole, under the action of the spring force of the first spring 36, only need to overcome their own gravity to move in the direction away from the static iron core 33, when it obtains the initial speed, the support member 35 abuts against the limiting portion 3421 of the valve needle 34, at this time it is easier to drive the valve needle to move, thereby improving the valve opening performance of the solenoid valve.

[0040] like Figure 3 , Figure 5 As shown, the static iron core 33 includes a first stepped hole portion 331, and the first stepped hole portion 331 has the aforementioned first axial through hole 330. The first stepped hole portion 331 includes a first hole section 332, a second hole section 333 and a matching hole section 334, and the matching hole section 334 is located between the first hole section 332 and the second hole section 333. The inner diameters of the first hole section 332 and the second hole section 333 are larger than the inner diameter of the matching hole section 334. A first stepped surface 335 is included between the first hole section 332 and the second hole section 333. The first spring 36 is partially located in the inner cavity 3320 of the first hole section 332. The valve needle 34 includes a matching section 3411 that is slidably matched with the matching hole section 334. The outer wall of the matching section 3411 has a notch 3410, that is, the cross section of the matching section 3411 is non-circular, and the notch 3410 communicates the inner cavity 3320 of the first hole section 332 with the inner cavity 3330 of the second hole section 333. The stationary iron core 33 is provided with a matching hole section 334, which can guide the axial movement of the valve needle 34. The valve needle 34 is provided with a notch 3410, and the notch 3410 serves as a balancing flow path so that the fluid in the inner cavity 3330 of the second hole section can flow into the inner cavity 3320 of the first hole section through the notch 3410.

[0041] Further, the partition portion 111 of the valve cover 11 includes a guide hole portion 1110 and a communication hole 1111. The guide hole portion 1110 is located below the matching hole section 334. The valve needle 34 is slidably matched with the guide hole portion 1110. The guide hole portion 1110 can guide the axial movement of the valve needle 34. The communication hole 1111 is symmetrically arranged relative to the guide hole portion 1110. The communication hole 1111 connects the upper cavity 101 with the inner cavity 3330 of the second hole section 333, that is, the communication hole 1111 connects the upper cavity 101 with the first axial through hole 330.

[0042] like Figure 3 , Figure 4 As shown, the moving iron core 32 includes a second stepped hole portion 321, and the second stepped hole portion 321 has a second axial through hole 320, and the second axial through hole 320 is connected to the first axial through hole 330, so that no back pressure cavity is formed above the moving iron core 32, and the action performance of the moving iron core 32 is improved. The second stepped hole portion 321 includes a third hole section 322, a fourth hole section 323 and a fifth hole section 324. The inner diameter of the third hole section 322 is greater than the inner diameter of the fourth hole section 323, and the inner diameter of the fourth hole section 323 is greater than the inner diameter of the fifth hole section 324. A second stepped surface 325 is included between the third hole section 322 and the fourth hole section 323, and a third stepped surface 326 is included between the fourth hole section 323 and the fifth hole section 324. The support member 35 and part of the first spring 36 are located in the inner cavity 3220 of the third hole section, and the support member 35 abuts against the second stepped surface 325. The third hole section 322 has a guide wall 3221 with an inner diameter gradually increasing toward the static iron core 33, and the guide wall 3221 is provided to facilitate the assembly of the support member 35. The second spring 37 and the limiting portion 3421 of the valve needle 34 are located in the inner cavity 3230 of the fourth hole section, one end of the second spring 37 abuts against the limiting portion 3421, and the other end of the second spring 37 abuts against the third step surface 326.

[0043] Furthermore, Figure 2 As shown, the upper section of the fourth hole section 323 has a reduced diameter hole section 3231 whose inner diameter gradually decreases toward the end cap 312, and the difference Dd between the minimum inner diameter D of the reduced diameter hole section 3231 and the outer diameter d of the second spring 37 is less than 0.5 mm. In this way, the upper end of the second spring 37 is constrained. The valve needle 34 includes a head 3412, which is located above the limiting portion 3421, and the second spring 37 is sleeved outside the head 3412. In this way, the lower end of the second spring 37 is guided and constrained. By constraining the upper and lower ends of the second spring 37, the head 3412 guides the second spring 37, which can improve the telescopic stability of the second spring 37 and improve its service life.

[0044] like Figure 6a , 6bAs shown, the valve needle 34 includes a needle body 341 and a collar 342, the needle body 341 includes a second outer step portion 3413 with the step surface facing upward, the collar 342 includes the aforementioned limit portion 3421, the collar 342 is placed on the second outer step portion 3413, and the needle body 341 and the collar 342 are fixed by laser welding. Of course, the valve needle 34 can also be an integrated structure, but the split structure reduces material cost and processing difficulty.

[0045] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that: The valve body component comprises a valve body part and a control component, wherein the control component comprises a sleeve component, a moving iron core, a static iron core, a valve needle, a support member, a first spring and a second spring, wherein the stiffness of the first spring is greater than the stiffness of the second spring, the sleeve component is fixedly connected to the valve body component, and the sleeve component is fixedly connected to the static iron core, the moving iron core is located in the sleeve component, and the static iron core is at least partially located in the sleeve component, the moving iron core can move axially relative to the sleeve component, the static iron core comprises a first axial through hole, and the valve needle passes through the first axial through hole, the support member is located below the limiting portion of the valve needle, and the support member can abut against the limiting portion, the first spring sleeves the valve needle, one end of the first spring abuts against the static iron core, and the other end of the first spring abuts against the support member, the support member abuts against the moving iron core, one end of the second spring abuts against the limiting portion, and the other end of the second spring abuts against the moving iron core, and the moving iron core can drive the valve needle to move axially.

2. The solenoid valve according to claim 1, characterized in that: It also includes a valve core component, which is located in the valve cavity of the solenoid valve, the valve core component is located below the static iron core, the valve core component has a pilot valve opening, the valve needle can abut against the pilot valve opening, and the valve core component can move relative to the valve body component to abut against the main valve opening of the valve body component.

3. The solenoid valve according to claim 1, characterized in that: The stationary iron core includes a first step hole portion, the first step hole portion has the first axial through hole, the moving iron core includes a second step hole portion, the second step hole portion includes a second axial through hole, the second axial through hole is connected to the first axial through hole, the first spring portion is located in the first axial through hole, the first spring portion and the support member are located in the second axial through hole, one end of the first spring abuts against the first step surface of the first step hole portion, and the support member abuts against the second step surface of the second step hole portion.

4. The solenoid valve according to claim 3, characterized in that: The first step hole portion includes a first hole section, a second hole section and a matching hole section, the matching hole section is located between the first hole section and the second hole section, the inner diameters of the first hole section and the second hole section are larger than the inner diameter of the matching hole section, the first hole section and the matching hole section include the first step surface, the first spring portion is located in the inner cavity of the first hole section, the valve needle includes a matching section that slidably matches with the matching hole section, the outer wall of the matching section has a notch, the notch connects the inner cavity of the first hole section with the inner cavity of the second hole section.

5. The solenoid valve according to claim 4, characterized in that It also includes a valve core component, the lower section of the static iron core includes a first outer step portion with the step surface facing upward, the sleeve component abuts the first outer step portion, the valve body component includes a partition portion, the static iron core abuts the partition portion, the partition portion includes a guide hole portion, the guide hole portion is located below the matching hole section, the valve needle is slidably matched with the guide hole portion, the valve cavity of the solenoid valve includes an upper cavity above the valve core component and a lower cavity below the valve core component, the partition portion has a connecting hole, the connecting hole is symmetrically arranged relative to the guide hole portion, the connecting hole connects the first axial through hole and the upper cavity, and the lower cavity is connected to the fluid inlet of the solenoid valve.

6. The solenoid valve according to claim 3, characterized in that: The second step hole portion includes a third hole segment and a fourth hole segment, the inner diameter of the third hole segment is larger than that of the fourth hole segment, the second step surface is included between the third hole segment and the fourth hole segment, the third hole segment has a guide wall with an inner diameter gradually increasing toward the static iron core, the first spring portion and the support member are located in the inner cavity of the third hole segment, and the support member abuts against the second step surface.

7. The solenoid valve according to claim 6, characterized in that The second step hole portion also includes a fifth hole segment, the inner diameter of the fourth hole segment is larger than that of the fifth hole segment, a third step surface is included between the fourth hole segment and the fifth hole segment, the second spring and the limiting portion are located in the inner cavity of the fourth hole segment, and the second spring abuts against the third step surface.

8. The solenoid valve according to claim 6, characterized in that: The difference Dd between the inner diameter D of the upper end of the fourth hole segment and the outer diameter d of the second spring is less than 0.5 mm. The valve needle comprises a head, which is located above the limiting portion, and the second spring covers the head.

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: When the solenoid valve is in a closed state, there is a preset distance L between the support member and the limit portion; when the solenoid valve is opened, after the support member moves the preset distance L, the support member abuts against the limit portion, and the support member can drive the valve needle to move axially upward.

10. The solenoid valve according to any one of claims 1 to 8, wherein the valve needle comprises a needle body and a collar, the needle body comprises a second outer step portion with the step surface facing upward, the collar comprises the limiting portion, the collar is disposed on the second outer step portion, and the needle body is fixed to the collar by welding.

11. The solenoid valve as claimed in claim 2, wherein the valve body component comprises a valve cover and a valve body, the valve cover is welded and fixed to the sleeve component, the valve cover comprises a downward extension portion, the inner wall of the downward extension portion is slidably matched with the outer wall of the valve core component, the valve body comprises an upward extension portion, the inner wall of the upward extension portion is provided with an internal thread, the outer wall of the downward extension portion is provided with an external thread, and the valve cover is fixed to the valve body by threaded engagement.

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