An integrated valve stem and solenoid valve

Abstract

This utility model discloses an integrated valve stem and a solenoid valve, relating to the technical field of solenoid valves. The integrated valve stem includes a valve stem body, an abutment rod portion, and a valve core sleeve. The valve stem body is slidably disposed within the valve body of the solenoid valve, and the valve core sleeve is sleeved outside the valve stem body. The abutment rod portion is coaxially connected to the end of the valve stem body and integrally formed with the valve stem body. The diameter of the abutment rod portion is smaller than the diameter of the valve stem body. The abutment rod portion extends out of the valve body of the solenoid valve and abuts against the moving iron core of the pilot assembly. This solenoid valve includes this integrated valve stem. This integrated valve stem can directly abut against the moving iron core, reducing the number of parts in the solenoid valve, reducing cumulative tolerances, and reducing the assembly steps of the solenoid valve.

Description

Technical Field

[0001] This utility model relates to the technical field of solenoid valves, and in particular to an integrated valve stem and solenoid valve. Background Technology

[0002] The solenoid valve drives the valve stem to move through the pilot assembly, thereby changing the flow path inside the valve body and realizing the electronic switching of the valve path.

[0003] In a traditional solenoid valve, the pilot assembly includes a housing, a stationary iron core, a moving iron core, and a coil. The housing is fixedly connected to the valve body of the solenoid valve, and the coil is wound around the stationary iron core. When the coil is energized, it drives the moving iron core to move relative to the stationary iron core through magnetic force. The moving iron core pushes the valve stem, thereby changing the working valve position of the solenoid valve.

[0004] In the aforementioned solenoid valve, the valve stem is housed within the valve body, and the pilot assembly is fixed to the valve body with screws. To ensure the moving iron core can act on the valve stem, a gasket is required between the moving iron core and the valve stem to compensate for any gaps between them. This increases the number of parts in the solenoid valve, increases the cumulative tolerances in part machining, slows the valve stem response, and adds numerous assembly steps. Utility Model Content

[0005] The purpose of this invention is to provide an integrated valve stem and solenoid valve. This integrated valve stem can reduce the number of parts in the solenoid valve, reduce cumulative tolerances, and reduce assembly steps.

[0006] According to a first aspect of the present invention, an integrated valve stem is provided, the integrated valve stem comprising a valve stem body, an abutting rod portion, and a valve core sleeve, the valve stem body being slidably disposed within the valve body of a solenoid valve, the valve core sleeve being sleeved outside the valve stem body; the abutting rod portion being coaxially connected to the end of the valve stem body and integrally formed with the valve stem body, the diameter of the abutting rod portion being smaller than the diameter of the valve stem body, the abutting rod portion being extended out of the valve body of the solenoid valve and abutting against the moving iron core of the pilot assembly.

[0007] Furthermore, the valve stem body has a mounting protrusion on its periphery, and the valve core sleeve has a mounting groove on its inner side that mates with the mounting protrusion.

[0008] Furthermore, a limiting groove is provided on the periphery of the valve stem body, and the limiting groove extends around the periphery of the valve stem body; the mounting protrusion is located in the limiting groove, the valve core sleeve is installed in the limiting groove, and the two ends of the valve core sleeve abut against the inner walls of the two sides of the limiting groove.

[0009] Furthermore, the valve stem body has two sealing grooves for installing sealing rings; the sealing grooves extend around the periphery of the valve stem body, the two sealing grooves are spaced apart, and the valve core sleeve is disposed between the two sealing grooves.

[0010] Furthermore, a spring mounting groove is provided at the end of the valve stem body away from the abutting rod portion, and the spring mounting groove is used for mounting a reset spring.

[0011] According to a second aspect of the present invention, a solenoid valve is provided, the solenoid valve comprising a valve body, a pilot assembly, a return spring, and an integral valve stem as described above, the valve body being provided with a valve cavity, an air inlet, and an air outlet, the air inlet and the air outlet both being connected to the valve cavity, and the valve stem body of the integral valve stem being installed within the valve cavity; the pilot assembly being connected to the valve body, and the abutting rod portion extending out of the valve cavity and abutting against the pilot assembly.

[0012] Furthermore, the pilot assembly includes a housing, a moving iron core, a stationary iron core, a frame, and a coil. The housing is fixedly connected to the valve body, the frame is fixedly disposed inside the housing, and the coil is wound around the outside of the frame. The stationary iron core is fixedly disposed inside the frame, and the moving iron core is axially movable and disposed inside the frame opposite to the stationary iron core. The abutting rod portion of the integrated valve stem penetrates into the housing and abuts against the moving iron core.

[0013] Furthermore, the moving iron core is located at the end of the stationary iron core away from the valve body, and a clearance hole is formed inside the stationary iron core. The abutting rod passes through the clearance hole and abuts against the moving iron core.

[0014] Furthermore, the end of the clearance hole facing the valve body forms a flared guide opening, and the connection between the abutment rod and the valve stem body is provided with a flared guide portion protruding radially, the guide portion being adapted to the guide opening.

[0015] Furthermore, the valve cavity extends through the valve body to form a mounting opening on the side facing the pilot assembly, and the side of the stationary iron core away from the moving iron core is embedded in the mounting opening.

[0016] In summary, this utility model has the following beneficial effects: 1. In the integrated valve stem of this utility model, a valve core sleeve is fitted over the valve stem body. The valve core sleeve is moved by the valve stem body to change its position in the valve body of the solenoid valve, thereby switching the valve position of the solenoid valve. The valve stem body is coaxially connected to the abutment rod part, which extends out of the valve body and directly abuts against the moving iron core of the pilot assembly. Thus, when the moving iron core moves, it directly pushes the valve stem to move, resulting in a faster response speed of the solenoid valve. Since there is no need to set intermediate parts such as gaskets to transmit the movement of the moving iron core, the number of parts of the solenoid valve can be reduced, the assembly steps of the solenoid valve parts can be reduced, the cumulative tolerance can be reduced, and the accuracy of valve stem movement can be increased, reducing flow error.

[0017] 2. The valve stem body and the abutment rod are integrally formed, which can reduce the number of machining operations and better ensure the coaxiality of the valve stem.

[0018] 3. The diameter of the abutment rod is smaller than the diameter of the valve stem body, so that the abutment rod can be inserted into the pilot assembly and abut against the moving iron core, while reducing the overall mass of the valve stem and reducing the inertia of the valve stem.

[0019] 4. The valve stem engages with the mounting groove on the inner side of the valve core sleeve via a mounting protrusion to limit the installation of the valve core sleeve, making it less likely for the valve core sleeve to shift axially relative to the valve stem. At the same time, the mounting protrusion supports the valve core sleeve radially.

[0020] 5. The valve core sleeve is installed through the circumferential limiting groove of the valve stem, which facilitates the positioning and installation of the valve core sleeve. At the same time, the opposite side walls of the limiting groove limit the valve core sleeve, further preventing the valve core sleeve from axially shifting relative to the valve stem. Attached Figure Description

[0021] Figure 1 This is a vertical cross-sectional structural diagram of the solenoid valve of Embodiment 1 of this utility model.

[0022] Figure 2 This is a vertical cross-sectional structural diagram of the integrated valve stem according to Embodiment 1 of this utility model.

[0023] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the integrated valve stem in Embodiment 2 of this utility model.

[0024] In the picture: 1000, Solenoid valve; 100, Valve body; 110, Valve cavity; 111, Mounting opening; 120, Air inlet; 130, Air outlet; 140, Annular groove; 141, Flat ring; 150, Valve core seat; 151, Valve core hole; 200, Pilot assembly; 210, Housing; 220, Frame; 230, Coil; 240, Stationary iron core; 241, Clearance hole; 242, Annular edge; 243, Guide port; 250, Moving iron core; 300, Return spring; 400, Integrated valve stem; 410, Valve stem body; 411, Mounting protrusion; 412, Limiting groove; 413, Spring mounting groove; 414, Sealing groove; 415, Sealing ring; 420, Abutment rod part; 421, Guide part; 430, Valve core sleeve; 431, Mounting groove. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Example 1 This embodiment discloses a solenoid valve 1000, referencing... Figure 1The solenoid valve 1000 includes a valve body 100, a pilot assembly 200, a return spring 300, and an integrated valve stem 400. The valve body 100 has a valve cavity 110, an inlet 120, and an outlet 130, both of which are connected to the valve cavity 110. The integrated valve stem 400 is installed within the valve cavity 110. The pilot assembly 200 is connected to the valve body 100, and the integrated valve stem 400 extends out of the valve cavity 110 and abuts against the pilot assembly 200. The return spring 300 is located within the valve cavity 110 and abuts against the end of the integrated valve stem 400 furthest from the pilot assembly 200.

[0027] Reference Figure 1 The pilot assembly 200 includes a housing 210, a frame 220, a coil 230, a stationary iron core 240, and a moving iron core 250. The housing 210 is fixedly connected to the valve body 100, the frame 220 is fixedly disposed within the housing 210, and the coil 230 is wound around the frame 220. The stationary iron core 240 is fixedly disposed within the frame 220, and the moving iron core 250 is axially movable within the frame 220.

[0028] The outer casing 210 has an opening on the side facing the valve body 100, and the valve cavity 110 passes through the side of the valve body 100 facing the pilot assembly 200 to form an installation opening 111. The installation opening 111 is aligned with the inner cavity of the frame 220 so that the integrated valve stem 400 inside the valve body 100 can pass into the frame 220 and abut against the moving iron core 250.

[0029] An annular groove 140 is provided on the side of the valve body 100 facing the outer casing 210. The annular groove 140 is coaxially arranged with the valve cavity 110, and a flat ring 141 is installed in the annular groove 140. The two sides of the flat ring 141 abut against the inner wall of the outer casing 210 and the annular groove 140 to seal the gap between the outer casing 210 and the valve body 100 when the outer casing 210 is fixedly connected to the valve body 100.

[0030] Reference Figure 1 and Figure 2 The integrated valve stem 400 includes a valve stem body 410, an abutting rod portion 420, and a valve core sleeve 430. The valve stem body 410 passes through the valve cavity 110 and can slide axially along the valve cavity 110. The valve core sleeve 430 is sleeved outside the valve stem body 410. The valve stem body 410 drives the valve core sleeve 430 to move, thereby changing the position of the valve core sleeve 430 in the valve cavity 110, thus switching the valve position of the solenoid valve 1000. The abutting rod portion 420 is coaxially connected to the end of the valve stem body 410. The end of the abutting rod portion 420 away from the valve stem body 410 passes through the mounting opening 111 and extends into the frame 220 to abut against the moving iron core 250.

[0031] Therefore, in this embodiment, the moving iron core 250 directly pushes the valve stem to move when it moves, which speeds up the response speed of the solenoid valve 1000. At the same time, there is no need to set intermediate parts such as gaskets to transmit the movement of the moving iron core 250, which reduces the number of parts of the solenoid valve 1000, reduces the assembly steps of the solenoid valve 1000, reduces the cumulative tolerance, increases the accuracy of the valve stem movement, and reduces the flow error.

[0032] The valve stem body 410 and the abutment rod part 420 are integrally formed, so that the valve stem can be processed and formed in one go, reducing the number of processing steps of the valve stem, while ensuring the coaxiality and strength of the valve stem.

[0033] Reference Figure 1 and Figure 2 In this embodiment, the diameter of the abutting rod portion 420 is smaller than the diameter of the valve stem body 410, that is, the abutting rod portion 420 is thinner than the valve stem body 410, so that the abutting rod portion 420 can be inserted into the frame 220 and abut against the moving iron core 250, while reducing the overall mass of the valve stem and reducing the inertia of the valve stem.

[0034] In this embodiment, the moving iron core 250 is disposed at the end of the stationary iron core 240 away from the valve body 100. The moving iron core 250 is a cylindrical iron core, and the stationary iron core 240 is a cylindrical component. A clearance hole 241 is formed inside the stationary iron core 240, and the abutting rod portion 420 passes through the clearance hole 241 and abuts against the moving iron core 250. Thus, the stationary iron core 240 guides the abutting rod portion 420 through the clearance hole 241, making the axial movement of the valve stem more stable.

[0035] In this embodiment, a ring edge 242 is formed on the side of the stationary iron core 240 away from the moving iron core 250, protruding radially outward. The ring edge 242 protrudes from the outer shell 210 and is embedded in the mounting opening 111, thereby making the connection strength between the pilot assembly 200 and the valve body 100 better and the structure more compact.

[0036] Reference Figure 1 and Figure 2 The clearance hole 241, facing the valve body 100, forms a flared guide port 243. Correspondingly, a flared guide portion 421 protrudes radially at the connection between the abutment rod portion 420 and the valve stem body 410, and the guide portion 421 is adapted to the guide port 243. Therefore, when assembling the solenoid valve 1000, after the valve stem is inserted into the valve cavity 110, the pilot assembly 200 is installed on the valve body 100, and the abutment rod portion 420 is inserted into the clearance hole 241 under the guidance of the guide port 243, facilitating the assembly of the solenoid valve 1000. When the valve stem moves, the guide portion 421 can cooperate with the guide port 243, preventing stress concentration and damage at the contact point between the stationary iron core 240 and the abutment rod portion 420.

[0037] Reference Figure 1 and Figure 2The valve stem body 410 has a ring-shaped mounting protrusion 411 around its periphery, and the valve core sleeve 430 has a mounting groove 431 on its inner side. The valve core sleeve 430 is made of flexible material. When the valve core sleeve 430 is fitted over the valve stem body 410, the mounting protrusion 411 engages with the mounting groove 431. The engagement of the mounting protrusion 411 and the mounting groove 431 limits the installation of the valve core sleeve 430, preventing it from shifting axially relative to the valve stem. At the same time, the mounting protrusion 411 radially supports the valve core sleeve 430, allowing it to maintain a certain shape radially for a sealing contact with the inner wall of the valve cavity 110.

[0038] In particular, on the cross section along the axial direction of the valve stem body 410, the cross section of the mounting protrusion 411 is trapezoidal, and the cross section of the corresponding mounting groove 431 is trapezoidal. This allows the mounting protrusion 411 to better support the valve core sleeve 430, while also facilitating the fitting of the valve core sleeve 430 onto the mounting protrusion 411.

[0039] In this embodiment, a limiting groove 412 is provided on the periphery of the valve stem body 410, extending around the periphery of the valve stem body 410. A mounting protrusion 411 is located within the limiting groove 412, and a valve core sleeve 430 is installed within the limiting groove 412, with both ends of the valve core sleeve 430 abutting against the inner walls of the limiting groove 412. Installing the valve core sleeve 430 through the limiting groove 412 facilitates its positioning and installation on the valve stem body 410. Simultaneously, the opposing side walls of the limiting groove 412 limit the valve core sleeve 430, further preventing axial displacement of the valve core sleeve 430 relative to the valve stem.

[0040] Reference Figure 2 A spring mounting groove 413 is provided at one end of the valve stem body 410 away from the abutting rod portion 420. The spring mounting groove 413 is a cylindrical groove. The return spring 300 is installed in the spring mounting groove 413. One end of the return spring 300 abuts against the bottom wall of the spring mounting groove 413, and the other end of the return spring 300 abuts against the bottom wall of the valve cavity 110 away from the pilot assembly 200.

[0041] Reference Figure 1 A valve core seat 150 is provided inside the valve cavity 110, and a valve core hole 151 is opened in the middle of the valve core seat 150. An air inlet 120 and an air outlet 130 are respectively provided on opposite sides of the valve core seat 150. Specifically, the air inlet 120 is provided on the side of the valve core seat 150 facing the pilot assembly 200, and the air outlet 130 is provided on the side of the valve core seat 150 away from the pilot assembly 200.

[0042] In this embodiment, the valve core sleeve 430 is disposed on the side of the valve core seat 150 opposite to the pilot assembly 200. The outer diameter of the valve core sleeve 430 is larger than the inner diameter of the valve core hole 151. When the coil 230 is energized, the moving iron core 250 pushes the valve stem to move away from the pilot assembly 200, compresses the valve core return spring 300, and the valve core sleeve 430 moves away from the valve core hole 151, thus connecting the air passage between the air inlet 120 and the air outlet 130. When the coil 230 is de-energized, the moving iron core 250 loses its magnetic force, the return spring 300 drives the valve stem to move closer to the pilot assembly 200, and the valve core sleeve 430 seals against the valve core hole 151, thus cutting off the air passage between the air inlet 120 and the air outlet 130.

[0043] In addition, in other embodiments, the valve core sleeve 430 may be disposed on the side of the valve core seat 150 facing the pilot assembly 200.

[0044] Reference Figure 2 In this embodiment, the valve stem body 410 has two spaced-apart sealing grooves 414, which are located at both ends of the valve stem body 410, and the valve core sleeve 430 is disposed between the two sealing grooves 414. The sealing grooves 414 extend around the periphery of the valve stem body 410, and a sealing ring 415 is installed in each of the two sealing grooves 414. The two sealing rings 415 seal both ends of the valve cavity 110, preventing air leakage from the valve cavity 110.

[0045] Example 2 This embodiment discloses an integrated valve stem 400, which is substantially the same as the integrated valve stem 400 in Embodiment 1, except that: Reference Figure 3 In this embodiment, the length of the integrated valve stem 400 is greater than that of the integrated valve stem 400 in Embodiment 1, and its specific length can be designed according to the solenoid valve 1000. The valve core sleeve 430 and the two sealing rings 415 are integrally formed, and both the valve core sleeve 430 and the two sealing rings 415 are installed in the limiting groove 412 on the periphery of the valve stem body 410.

[0046] In this embodiment, the inner ring of the valve core sleeve 430 is not provided with an installation groove 431, and the bottom wall of the limiting groove 412 on the periphery of the valve stem body 410 is a circumferential surface and is not provided with an installation protrusion 411. The valve core sleeve 430 is directly fitted into the limiting groove 412.

[0047] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An integrated valve stem, characterized by, The integrated valve stem (400) includes a valve stem body (410), an abutment rod portion (420), and a valve core sleeve (430). The valve stem body (410) is slidably disposed within the valve body (100) of the solenoid valve (1000), and the valve core sleeve (430) is sleeved outside the valve stem body (410). The abutment rod portion (420) is coaxially connected to the end of the valve stem body (410) and integrally formed with the valve stem body (410). The diameter of the abutment rod portion (420) is smaller than the diameter of the valve stem body (410). The abutment rod portion (420) is used to extend out of the valve body (100) of the solenoid valve (1000) and abut against the moving iron core (250) of the pilot assembly (200).

2. An integral valve stem as defined in claim 1, wherein The valve stem body (410) is provided with a mounting protrusion (411) on its periphery, and the valve core sleeve (430) is provided with a mounting groove (431) that mates with the mounting protrusion (411) on its inner side.

3. An integral valve stem as defined in claim 2 wherein, A limiting groove (412) is provided on the periphery of the valve stem body (410), and the limiting groove (412) extends around the periphery of the valve stem body (410); the mounting protrusion (411) is located in the limiting groove (412), the valve core sleeve (430) is installed in the limiting groove (412), and the two ends of the valve core sleeve (430) abut against the inner walls of the two sides of the limiting groove (412).

4. An integral valve stem as defined in claim 1, wherein The valve stem body (410) has two sealing grooves (414) for installing sealing rings (415); the sealing grooves (414) extend around the circumference of the valve stem body (410), the two sealing grooves (414) are spaced apart, and the valve core sleeve (430) is disposed between the two sealing grooves (414).

5. The integrated valve stem as described in claim 1, characterized in that, A spring mounting groove (413) is provided at one end of the valve stem body (410) away from the abutment rod portion (420), and the spring mounting groove (413) is used for mounting the return spring (300).

6. A solenoid valve, characterized in that, The solenoid valve (1000) includes a valve body (100), a pilot assembly (200), a return spring (300), and an integrated valve stem (400) as described in any one of claims 1-5. The valve body (100) is provided with a valve cavity (110), an air inlet (120), and an air outlet (130). The air inlet (120) and the air outlet (130) are both connected to the valve cavity (110). The valve stem body (410) of the integrated valve stem (400) is installed in the valve cavity (110). The pilot assembly (200) is connected to the valve body (100), and the abutting rod portion (420) extends out of the valve cavity (110) and abuts against the pilot assembly (200).

7. A solenoid valve as described in claim 6, characterized in that, The pilot assembly (200) includes a housing (210), a moving iron core (250), a stationary iron core (240), a frame (220), and a coil (230). The housing (210) is fixedly connected to the valve body (100), the frame (220) is fixedly disposed inside the housing (210), and the coil (230) is wound around the outside of the frame (220). The stationary iron core (240) is fixedly disposed inside the frame (220), and the moving iron core (250) is axially movable inside the frame (220) and opposite to the stationary iron core (240). The abutting rod portion (420) of the integrated valve stem (400) passes through the housing (210) and abuts against the moving iron core (250).

8. A solenoid valve as described in claim 7, characterized in that, The moving iron core (250) is located at the end of the stationary iron core (240) away from the valve body (100). An avoidance hole (241) is formed in the stationary iron core (240). The abutting rod (420) passes through the avoidance hole (241) and abuts against the moving iron core (250).

9. A solenoid valve as described in claim 8, characterized in that, The clearance hole (241) has a flared guide opening (243) at one end facing the valve body (100). The abutment rod (420) and the valve stem body (410) are connected by a horn-shaped guide part (421) that protrudes radially. The guide part (421) is adapted to the guide opening (243).

10. A solenoid valve as described in claim 7, characterized in that, The valve cavity (110) penetrates the valve body (100) and forms a mounting opening (111) on the side facing the pilot assembly (200). The stationary iron core (240) is embedded in the mounting opening (111) on the side away from the moving iron core (250).

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