Two-way three-way solenoid valve

Abstract

The present application relates to a kind of two-position three-way electromagnetic valve, including shell, electromagnetic assembly, valve core assembly and valve seat, electromagnetic assembly is contained in shell, valve core assembly is sleeved in the inner periphery of electromagnetic assembly;Valve core assembly includes sleeve, static core and moving core assembly, sleeve is fixedly connected to valve seat, valve cavity is defined in sleeve, static core is fixedly connected to the end of sleeve away from valve seat, static core is provided with longitudinal through channel, and partially extends into sleeve, so that channel communicates valve cavity, moving core assembly is movably installed in sleeve, valve seat includes first valve hole and second valve hole, which are both communicated with valve cavity.The shell is in the form of a bottomed cylinder with an opening at one end, the static core is integrated with the shell at the bottom of the shell, thus reducing the number of parts, simplifying the production and assembly process, and reducing the assembly tolerance, so that the moving core assembly can reliably block the two channels in the valve core, preventing the two-position three-way electromagnetic valve from leaking.

Description

Technical Field

[0001] This invention relates to the technical field of solenoid valves, and more specifically, to a two-position three-way solenoid valve for an electromechanical automatic transmission. Background Technology

[0002] A two-position three-way solenoid valve typically includes a solenoid component and a valve component. The solenoid component generates an electromagnetic field when power is applied, and the valve component uses the electromagnetic field generated by the solenoid component to switch between two different fluid flow channels inside, thereby opening or closing the two-position three-way solenoid valve.

[0003] In existing two-position three-way solenoid valves, the valve assembly includes a stationary iron core and a moving iron core. The solenoid assembly includes a winding bobbin fixed to the stationary iron core, a coil wound around the outer circumference of the winding bobbin, and a housing for covering the coil. However, these components are usually of a split structure, resulting in a large number of parts. This not only makes the production and assembly process more complex, but also leads to larger tolerances during assembly. When the moving iron core collides with the stationary iron core, the moving iron core cannot completely seal one of the fluid flow channels, thus causing internal leakage in the two-position three-way solenoid valve. Summary of the Invention

[0004] To overcome the above problems, the present invention provides a two-position three-way solenoid valve, which has the advantages of fewer parts, simple assembly process, and long service life.

[0005] According to an embodiment of the present invention, a two-position three-way solenoid valve is provided, comprising a housing, an electromagnetic assembly, a valve core assembly, and a valve seat. The electromagnetic assembly is housed within the housing, and the valve core assembly is sleeved on the inner circumference of the electromagnetic assembly. The valve core assembly includes a sleeve, a stationary iron core, and a moving iron core assembly. The sleeve is fixedly connected to the valve seat and defines a valve cavity within the sleeve. The stationary iron core is fixedly connected to the end of the sleeve furthest from the valve seat. The stationary iron core has a longitudinally penetrating channel and partially extends into the sleeve, such that the channel communicates with the valve cavity. The moving iron core assembly... The valve seat is movably installed inside the sleeve. It includes a first valve hole and a second valve hole, both of which communicate with the valve cavity. The moving iron core assembly has a first state and a second state. In the first state, the moving iron core assembly blocks the first valve hole, allowing the second valve hole to communicate with the channel via the valve cavity. In the second state, the moving iron core assembly blocks the channel, allowing the second valve hole to communicate with the first valve hole via the valve cavity. The housing is a bottomed cylindrical shape with an opening at one end. The stationary iron core is integrated with the housing at the bottom of the housing.

[0006] According to a preferred embodiment of the present invention, the moving iron core assembly includes a moving iron core, a first sealing member, and a second sealing member. The first sealing member and the second sealing member are both fixedly disposed inside the moving iron core and can move with the moving iron core in the valve cavity. The first sealing member blocks the first valve hole in the first state, and the second sealing member blocks the channel in the second state.

[0007] According to a preferred embodiment of the present invention, the moving iron core assembly further includes a buffer spring, which is clamped between the first sealing member and the second sealing member and is in a compressed state.

[0008] According to a preferred embodiment of the present invention, the moving iron core is provided with a longitudinally penetrating through hole, the first sealing member and the second sealing member are fixedly accommodated in the through hole, and a gap is formed between each of the first sealing member and the second sealing member and the through hole to allow fluid to flow through.

[0009] According to a preferred embodiment of the present invention, the first sealing member includes a first rubber member and a first metal member. When the moving iron core assembly is in a first state, the first rubber member directly contacts the valve seat to seal the first valve orifice. The first metal member is fixedly embedded in the side of the first rubber member near the buffer spring and directly abuts against the buffer spring; and / or

[0010] The second sealing component includes a second rubber component and a second metal component. When the moving iron core assembly is in the second state, the second rubber component directly contacts the stationary iron core to block the channel. The second metal component is fixedly embedded in the side of the second rubber component near the buffer spring and directly abuts against the buffer spring.

[0011] According to a preferred embodiment of the present invention, the valve core assembly includes a return spring sleeved between the moving iron core and the sleeve, wherein the moving iron core has a radially outwardly protruding flange formed on the outer peripheral surface of the end away from the stationary iron core, and the opposite ends of the return spring respectively abut against the sleeve and the flange.

[0012] According to a preferred embodiment of the present invention, the sleeve has a small diameter portion and a large diameter portion connected to the small diameter portion, the diameter of the large diameter portion being larger than the diameter of the small diameter portion, the return spring being installed inside the large diameter portion, one end of the return spring pressing against the flange, and the other end pressing against the stepped connection between the small diameter portion and the large diameter portion.

[0013] According to a preferred embodiment of the present invention, the valve seat is formed with a first protrusion protruding toward the valve cavity, the first valve hole passing through the first protrusion, and the first protrusion having a tapered shape that gradually decreases toward the valve cavity; and / or

[0014] The portion of the stationary iron core extending into the sleeve forms a second protrusion protruding toward the valve cavity, the channel passing through the second protrusion, and the second protrusion having a tapered shape that gradually decreases toward the valve cavity.

[0015] According to a preferred embodiment of the present invention, the first valve hole penetrates the valve seat at the center position of the valve seat, and the first valve hole has a tapered shape that gradually decreases towards the valve cavity.

[0016] According to a preferred embodiment of the present invention, the electromagnetic component includes a winding bobbin and a coil wound around the outer periphery of the winding bobbin. The winding bobbin includes an insertion portion that is inserted into a socket formed at the bottom of the housing to fix the winding bobbin to the housing. The electromagnetic component also includes a magnetically conductive metal plate that is mounted on the outer periphery of the winding bobbin and together with the housing and the winding bobbin, encloses a space that seals the coil.

[0017] According to the above embodiments of the present invention, since the stationary iron core of the valve core assembly is located near the bottom of the housing and forms an integral structure with the housing, the number of parts can be reduced, thereby simplifying the production and assembly process. At the same time, the assembly tolerance can be reduced, so that the moving iron core assembly can reliably seal the two channels inside the valve core and prevent internal leakage of the two-position three-way solenoid valve. Attached Figure Description

[0018] Embodiments of the present invention are further described below with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or corresponding elements. Wherein:

[0019] Figure 1 A schematic cross-sectional view of a two-position three-way solenoid valve in the closed state, according to an embodiment of the present invention, is shown.

[0020] Figure 2 Another schematic cross-sectional view of a two-position three-way solenoid valve according to an embodiment of the present invention is shown in the closed state with the housing removed;

[0021] Figure 3 A schematic cross-sectional view of a two-position three-way solenoid valve in the open state, according to an embodiment of the present invention, is shown.

[0022] Figure 4 Another schematic cross-sectional view of a two-position three-way solenoid valve with its housing removed is shown, according to an embodiment of the present invention. Detailed Implementation

[0023] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples, wherein the same or similar parts in the drawings are identified by the same reference numerals. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0024] In the following description of the present invention, it should be noted that, unless otherwise stated, the terms "upper," "lower," "inner," "outer," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the present invention.

[0025] In the description of this invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The two-position three-way solenoid valve according to the present invention can be used in electromechanical automatic transmissions. To better understand the present invention, the following description is provided. Figures 1 to 4 A two-position three-way solenoid valve according to an embodiment of the present invention will be described, wherein, Figure 1 and Figure 2 A schematic cross-sectional view of a two-position three-way solenoid valve in the closed state, according to an embodiment of the present invention, is shown. Figure 3 and Figure 4 A schematic cross-sectional view of a two-position three-way solenoid valve in the open state according to an embodiment of the present invention is shown. As shown, the two-position three-way solenoid valve according to the present invention includes a housing 10, a solenoid assembly 20, a valve core assembly 30, and a valve seat 40.

[0027] The housing 10 is a bottomed cylindrical shape with an opening at one end, used to house and protect the electromagnetic assembly 20. The electromagnetic assembly 20 and the valve core assembly 30 are mounted on the housing 10 through the opening.

[0028] The electromagnetic component 20 is partially housed in the housing 10 and includes a winding drum 21 and a coil 22 wound around the outer periphery of the winding drum 21. The winding drum 21 is fixedly connected to the housing 10. Specifically, the winding drum 21 includes an insertion portion protruding towards the housing 10, and a socket is formed at the bottom of the housing 10. The insertion portion can be inserted into the socket to facilitate the assembly connection between the winding drum 21 and the housing 10. A central channel is formed inside the winding drum 21.

[0029] The valve core assembly 30 is fitted around the inner circumference of the electromagnetic assembly 20. Specifically, as shown... Figure 1 and Figure 3 As shown, the valve core assembly 30 is disposed in the central channel of the winding drum 21, such that part of it is housed inside the housing 10, while the other part is exposed outside the housing 10 to be connected to the valve seat 40.

[0030] The valve seat 40 is fixedly mounted on the bottom of the valve core assembly 30. The valve seat 40 includes a first valve hole 41 and a second valve hole 42. The first valve hole 41 is located approximately at the center of the valve seat 40, and the second valve hole 42 is located radially outward relative to the first valve hole 41. Both the first valve hole 41 and the second valve hole 42 extend vertically through the valve seat 40.

[0031] The following is for reference. Figures 1 to 4 The valve core assembly 30 is described in detail. The valve core assembly 30 includes a sleeve 31, a stationary iron core 32, and a moving iron core assembly.

[0032] The stationary iron core 32 and the sleeve 31 are arranged vertically within the central channel of the winding drum 21. Specifically, the stationary iron core 32 is positioned near the bottom of the housing 10, while the sleeve 31 is positioned near the opening of the housing 10. The stationary iron core 32 and the sleeve 31 are fixedly connected to the winding drum 21 and are also airtightly connected to the winding drum 21. Preferably, a sealing element 50 is provided at the connection between the sleeve 31 and the stationary iron core 32 to prevent fluid leakage. The bottom end of the sleeve 31 is fixedly connected to the top of the valve seat 40, and a valve cavity 311 is formed inside the sleeve 31, wherein the first valve hole 41 and the second valve hole 42 of the valve seat 40 can both communicate with the valve cavity 311. The bottom end of the stationary iron core 32 is fixedly connected to the top end of the sleeve 31, and the stationary iron core 32 includes a channel 320 extending vertically through the stationary iron core 32. The stationary iron core 32 partially extends into the sleeve 31, allowing the channel 320 to communicate fluidly with the valve cavity 311. The moving iron core assembly is installed inside the sleeve 31 and can move up and down in the valve cavity 311 under the action of the electromagnetic field generated by the electromagnetic component 20, so as to selectively control the blocking of the channel 320 of the stationary iron core 32 and the first valve hole 41 of the valve seat 40.

[0033] The moving iron core assembly includes a moving iron core 33, a first sealing member 34, a buffer spring 35, a second sealing member 36, and a return spring 37. The buffer spring 35, the first sealing member 34, and the second sealing member 36 are all fixedly disposed within the moving iron core 33 and can move within the valve cavity 311 as the moving iron core 33 moves. The return spring 37 is sleeved on the outer circumferential surface of the moving iron core 33 to push the moving iron core 33 towards the valve seat 40.

[0034] Specifically, the moving iron core 33 has a longitudinally penetrating through hole 330. The buffer spring 35, the first sealing member 34, and the second sealing member 36 are all fixedly housed within the through hole 330 and can move together with the moving iron core 33. The lower end of the first sealing member 34 can contact the valve seat 40 to close the first valve hole 41, and the upper end of the second sealing member 36 can contact the stationary iron core 32 to close the channel 320. The buffer spring 35 is sandwiched between the first sealing member 34 and the second sealing member 36 and is in a compressed state. The compressed buffer spring 35 can elastically adjust the position of the first sealing member 34 and the second sealing member 36, thereby ensuring that the moving iron core 33 drives the first sealing member 34 to completely seal the first valve hole 41 of the valve seat 40, and also ensuring that the moving iron core 33 drives the second sealing member 36 to completely seal the channel 320 of the stationary iron core 32. A first gap is formed between the first sealing member 34 and the moving iron core 33 to allow fluid to flow through. Similarly, a second gap is also formed between the second sealing member 36 and the moving iron core 33 to allow fluid to flow through. The first gap and the second gap can be formed by radially inwardly recessing from the outer peripheral surfaces of the first sealing member 34 and the second sealing member 36, respectively.

[0035] Therefore, the moving iron core assembly can achieve, by means of the electromagnetic field generated by the electromagnetic component 20, the following: Figure 1 and Figure 2 The first state shown and as Figure 3 and Figure 4 The second state is shown. In the first state, the electromagnetic component 20 is not energized, and the return spring 37 presses the moving iron core 33 downward toward the valve seat 40, so that the lower end of the first sealing member 34 contacts the valve seat 40 and seals the first valve hole 41. At this time, the second sealing member 36 will move away from the stationary iron core 32 and open the channel 320, so that after the gas enters the valve chamber 311 through the second valve hole 42, it can flow sequentially through the first gap between the first sealing member 34 and the moving iron core 33, the through hole 330 of the moving iron core 33, and the second gap between the second sealing member 36 and the moving iron core 33, and then flow out through the channel 320 of the stationary iron core 32, that is, the fluid flows along... Figure 1The flow direction indicated by the dashed arrow in the diagram achieves connectivity between the second valve orifice 42 and the channel 320, while simultaneously blocking the flow path between the first valve orifice 41 and the second valve orifice 42, thus keeping the solenoid valve in the closed state. In the second state, the electromagnetic component 20 is energized, the stationary iron core 32 attracts the moving iron core 33, and the moving iron core 33 overcomes the force of the return spring 37 and moves upward away from the valve seat 40, opening the first valve orifice 41. The upper end of the second sealing member 36 contacts the stationary iron core 32 to seal the channel 320, allowing gas to flow out from the second valve orifice 42 after entering the valve chamber 311 through the first valve orifice 41. Figure 3 The flow direction indicated by the dashed arrow in the figure enables the connection of the flow path between the second valve hole 42 and the first valve hole 41, thereby putting the solenoid valve in the open state.

[0036] The two-position three-way solenoid valve according to the present invention is a normally closed solenoid valve, that is, it is always in a closed state. Figure 1 and Figure 2 The first state shown is the off state, which is only switched to when the machine is in operation. Figure 3 and Figure 4 The second state shown is the open state, which generates air pressure to drive the electromechanical automatic transmission to perform operations such as gear shifting.

[0037] According to an embodiment of the present invention, the stationary iron core 32 is disposed near the bottom of the housing 10 and is integrally formed with the housing 10. Optionally, the stationary iron core 32 and the housing 10 are integrally formed by stamping. This reduces the number of parts, thereby simplifying the production and assembly process, and also reduces assembly tolerances, enabling the moving iron core assembly to reliably seal the first valve hole 41 of the valve seat 40 and the channel 320 of the stationary iron core 32, preventing internal leakage in the two-position three-way solenoid valve.

[0038] Furthermore, the moving iron core 33 has a radially outwardly protruding flange 331 on its outer circumferential surface at the end away from the stationary iron core 32. The opposite ends of the return spring 37 press against the sleeve 31 and the flange 331, respectively. Specifically, the sleeve 31 has a small-diameter portion and a large-diameter portion connected to the small-diameter portion. The diameter of the large-diameter portion is larger than that of the small-diameter portion, thereby forming a step at the connection between the small-diameter portion and the large-diameter portion. The return spring 37 is installed in the large-diameter portion, with one end pressing against the flange 331 and the other end pressing against the step-shaped connection between the small-diameter portion and the large-diameter portion.

[0039] As described above, the return spring 37 is sleeved on the outer circumferential surface of the moving iron core 33 away from the stationary iron core 32, and is housed within the large-diameter portion of the sleeve 31. This method of increasing the diameter of the sleeve 31 at the position away from the stationary iron core 32 to house the return spring 37 effectively prevents phenomena such as reduced electromagnetic force caused by removing a portion of material from the moving iron core 33 to form a groove for housing the return spring 37. This ensures that the stationary iron core 32 generates sufficient attraction force on the moving iron core 33 when the electromagnetic assembly 20 is energized, thereby guaranteeing the normal operation of the entire solenoid valve.

[0040] In a preferred embodiment, the first sealing member 34 includes a first rubber member 341 and a first metal member 342. When the moving iron core assembly is in the first state, the first rubber member 341 directly contacts the valve seat 40 to block the first valve hole 41. The first metal member 342 is partially embedded in the first rubber member 341 and is fixedly connected to it. Specifically, the first metal member 342 is fixedly embedded in the side of the first rubber member 341 near the buffer spring 35 and directly abuts against the buffer spring 35. The first rubber member 341 is vulcanized from rubber material, and the first metal member 342 is made of a metal material with higher hardness. The hardness of the first metal member 342 is greater than that of the first rubber member 341. Therefore, by placing the harder first metal part 342 between the first rubber part 341 and the buffer spring 35, the softer first rubber part 341 can be prevented from directly contacting the buffer spring 35, which would cause wear on the first rubber part 341, thereby extending the service life of the first sealing part 34 and ensuring that the first rubber part 341 reliably seals the first valve hole 41 of the valve seat 40.

[0041] Furthermore, preferably, the second sealing element 36 includes a second rubber element 361 and a second metal element 362. When the moving iron core assembly is in the second state, the second rubber element 361 directly contacts the stationary iron core 32 to block the channel 320. The second metal element 362 is partially embedded in the second rubber element 361 and fixedly connected to it. That is, the second metal element 362 is fixedly embedded in the side of the second rubber element 361 near the buffer spring 35 and directly abuts against the buffer spring 35. The second rubber element 361 is vulcanized from rubber material, and the second metal element 362 is made of a metal material with higher hardness; the hardness of the second metal element 362 is greater than that of the second rubber element 361. Therefore, by placing the harder second metal part 362 between the second rubber part 361 and the buffer spring 35, the softer second rubber part 361 can be prevented from directly contacting the buffer spring 35, which would cause wear on the second rubber part 361. This extends the service life of the second sealing part 36 and ensures that the second rubber part 361 reliably seals the channel 320 of the stationary iron core 32.

[0042] In a preferred embodiment, the valve seat 40 has a first protrusion 400 protruding towards the valve cavity 311. The first protrusion 400 is located at the bottom center of the valve cavity 311 and extends upward into the sleeve 31. The first valve hole 41 passes through the first protrusion 400. The first protrusion 400 has a tapered shape that gradually decreases towards the valve cavity 311. The tapered first protrusion 400 can reduce the contact area between the first sealing member 34 and the valve seat 40, increase the pressure exerted by the first sealing member 34 on the first valve hole 41, and make the pressure sealing of the first sealing member 34 on the first valve hole 41 more stable and reliable.

[0043] Furthermore, preferably, the portion of the stationary iron core 32 extending into the sleeve 31 forms a second protrusion 321 protruding towards the valve cavity 311. The second protrusion 321 is located at the top center position within the valve cavity 311, and the channel 320 passes through the second protrusion 321. The second protrusion 321 has a tapered shape that gradually decreases towards the valve cavity 311. The tapered second protrusion 321 can reduce the contact area between the second sealing member 36 and the stationary iron core 32, increase the pressure exerted by the second sealing member 36 on the channel 320, and make the pressure sealing of the channel 320 by the second sealing member 36 more stable and reliable.

[0044] In a preferred embodiment, the first valve orifice 41 has a tapered shape that gradually decreases towards the valve cavity 311. This tapered shape increases the flow velocity of the fluid as it enters the valve cavity 311 through the first valve orifice 41, thereby improving the overall response speed of the solenoid valve.

[0045] In addition, in a preferred embodiment, the electromagnetic component 20 further includes a magnetically conductive metal plate 23. The magnetically conductive metal plate 23 is disposed at the opening of the housing 10 and installed on the outer periphery of the winding drum 21. The magnetically conductive metal plate 23, together with the housing 40 and the winding drum 21, encloses the space for the coil 22. This allows the coil 22 to be placed in the enclosed space, thereby preventing external impurities from approaching the coil 22 and causing a short circuit, ensuring the reliable operation of the electromagnetic component 20. Furthermore, the magnetically conductive metal plate 23, together with the housing 40 and the winding drum 21, forms a magnetically conductive circuit for the coil 22, so as to generate an electromagnetic field when the coil 22 is energized.

[0046] Although the invention has been described with reference to preferred embodiments, various modifications can be made and elements can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A two-position three-way solenoid valve, characterized in that, Includes a housing (10), an electromagnetic assembly (20), a valve core assembly (30), and a valve seat (40). The electromagnetic component (20) is housed within the housing (10), and the valve core assembly (30) is sleeved on the inner periphery of the electromagnetic component (20); The valve core assembly (30) includes a sleeve (31), a stationary iron core (32), and a moving iron core assembly. The sleeve (31) is fixedly connected to the valve seat (40). A valve cavity (311) is defined inside the sleeve (31). The stationary iron core (32) is fixedly connected to the end of the sleeve (31) away from the valve seat (40). The stationary iron core (32) is provided with a longitudinally penetrating channel (320) and partially extends into the sleeve (31), so that the channel (320) communicates with the valve cavity (311). The moving iron core assembly is movably installed inside the sleeve (31). The valve seat (40) includes a first valve hole (41) and a second valve hole (42) that communicate with the valve cavity (311) respectively. The moving iron core assembly has a first state and a second state. In the first state, the moving iron core assembly blocks the first valve hole (41), so that the second valve hole (42) communicates with the channel (320) through the valve cavity (311). In the second state, the moving iron core assembly blocks the channel (320), so that the second valve hole (42) communicates with the first valve hole (41) through the valve cavity (311). The housing (10) is a bottomed cylindrical shape with an opening at one end, and the stationary iron core (32) is integrated with the housing (10) at the bottom of the housing (10).

2. The two-position three-way solenoid valve according to claim 1, characterized in that, The moving iron core assembly includes a moving iron core (33), a first sealing member (34), and a second sealing member (36). The first sealing member (34) and the second sealing member (36) are both fixedly disposed in the moving iron core (33) and can move with the moving iron core (33) in the valve cavity (311). The first sealing member (34) blocks the first valve hole (41) in the first state, and the second sealing member (36) blocks the channel (320) in the second state.

3. The two-position three-way solenoid valve according to claim 2, characterized in that, The moving iron core assembly also includes a buffer spring (35), which is clamped between the first sealing member (34) and the second sealing member (36) and is in a compressed state.

4. The two-position three-way solenoid valve according to claim 2, characterized in that, The moving iron core (33) is provided with a longitudinal through hole (330), the first sealing member (34) and the second sealing member (36) are fixedly housed in the through hole (330), and a gap is formed between each of the first sealing member (34) and the second sealing member (36) and the through hole (330) to allow fluid to flow.

5. The two-position three-way solenoid valve according to claim 3, characterized in that, The first sealing element (34) includes a first rubber element (341) and a first metal element (342). The first rubber element (341) directly contacts the valve seat (40) and blocks the first valve hole (41) when the moving iron core assembly is in the first state. The first metal element (342) is fixedly embedded in the side of the first rubber element (341) near the buffer spring (35) and directly abuts against the buffer spring (35); and / or The second sealing member (36) includes a second rubber member (361) and a second metal member (362). The second rubber member (361) directly contacts the stationary iron core (32) and blocks the channel (320) when the moving iron core assembly is in the second state. The second metal member (362) is fixedly embedded in the side of the second rubber member (361) near the buffer spring (35) and directly abuts against the buffer spring (35).

6. The two-position three-way solenoid valve according to any one of claims 2 to 5, characterized in that, The valve core assembly (30) includes a return spring (37) sleeved between the moving iron core (33) and the sleeve (31). The moving iron core (33) has a radially outwardly protruding flange (331) formed on the outer peripheral surface of the end away from the stationary iron core (32). The opposite ends of the return spring (37) press against the sleeve (31) and the flange (331) respectively.

7. The two-position three-way solenoid valve according to claim 6, characterized in that, The sleeve (31) has a small diameter portion and a large diameter portion connected to the small diameter portion. The diameter of the large diameter portion is larger than the diameter of the small diameter portion. The return spring (37) is installed in the large diameter portion. One end of the return spring (37) abuts against the flange (331), and the other end abuts against the stepped connection between the small diameter portion and the large diameter portion.

8. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The valve seat (40) is formed with a first protrusion (400) protruding toward the valve cavity (311), the first valve hole (41) passing through the first protrusion (400), and the first protrusion (400) having a tapered shape that gradually decreases toward the valve cavity (311); and / or The portion of the stationary iron core (32) extending into the sleeve (31) forms a second protrusion (321) protruding toward the valve cavity (311), the channel (320) passing through the second protrusion (321), and the second protrusion (321) having a tapered shape that gradually decreases toward the valve cavity (311).

9. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The first valve hole (41) penetrates the valve seat (40) at the center position of the valve seat (40), and the first valve hole (41) has a tapered shape that gradually decreases toward the valve cavity (311).

10. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The electromagnetic assembly (20) includes a winding bobbin (21) and a coil (22) wound around the outer periphery of the winding bobbin (21). The winding bobbin (21) includes an insertion portion that is inserted into a socket formed at the bottom of the housing (10) to fix the winding bobbin (21) to the housing (10). The electromagnetic component (20) also includes a magnetically conductive metal plate (23), which is installed on the outer periphery of the winding drum (21) and together with the housing (10) and the winding drum (21) encloses the space that encloses the coil (22).

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