Two-position three-way solenoid valve

Abstract

The present invention relates to the technical field of solenoid valves, and specifically to a two-position three-way solenoid valve, comprising a valve body and a valve stem, wherein the valve body is provided with a mounting groove, an air inlet and two air outlets, and a first sealing component and a second sealing component are respectively provided at both ends of the mounting groove, and a first connecting port is provided on the first sealing component and the second sealing component; the present invention drives the rotation of the first sealing component and the second sealing component through the linear motion of the valve stem, achieves the initial sealing requirement through the linear motion of the valve stem, and rotates the first connecting port to form an offset to achieve secondary sealing through the rotation of the first sealing component and the second sealing component, thereby playing a double protection role, so that even if the solenoid valve has a slight leakage in the primary seal due to manufacturing tolerance, long-term wear or temperature change, the secondary seal formed by the rotation of the first sealing component and the second sealing component can further prevent the leakage of airflow, thereby improving the overall sealing performance of the two-position three-way solenoid valve.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, in particular to a two-position three-way solenoid valve. Background Art

[0002] Two-position, three-way solenoid valves play a key role in industrial automation and fluid control systems. Their unique structure and operating principle make them widely used in a variety of applications. The main structure of a two-position, three-way solenoid valve typically consists of an electromagnet, a valve body, a valve core, and seals. The electromagnet is the core component that controls the opening and closing of the valve, the valve body carries and guides the fluid, the valve stem is responsible for switching the fluid channels, and the seals ensure the system's tightness. The main feature of a two-position, three-way solenoid valve is that the valve stem has two operating positions and three channels, achieving precise control of the fluid through the interaction of electromagnetic force and spring force.

[0003] When the solenoid is energized, the generated magnetic force attracts the valve stem, separating it from the valve seat and opening a specific fluid channel, allowing the medium to flow. When the power is removed, the spring force resets the valve stem, closing the channel and opening another, switching the fluid path. This design enables the two-position, three-way solenoid valve to respond quickly and achieve precise control of the fluid. Despite its widespread industrial application, two-position, three-way solenoid valves still have issues such as insufficient sealing performance, slow response speed, and poor durability. Summary of the Invention

[0004] In response to the above problems, a two-position three-way solenoid valve is provided. The present invention drives the rotation of the first sealing component and the second sealing component through the linear motion of the valve stem, achieves the initial sealing requirement through the linear motion of the valve stem, and causes the first connecting port to rotate and form an offset through the rotation of the first sealing component and the second sealing component to achieve secondary sealing, thereby playing a double protection role. Even if the solenoid valve has a slight leakage in the primary seal due to manufacturing tolerances, long-term wear or temperature changes, the secondary seal formed by the rotation of the first sealing component and the second sealing component can further prevent the leakage of airflow, thereby improving the overall sealing performance of the two-position three-way solenoid valve.

[0005] In order to solve the problems of the prior art, the present invention provides a two-position three-way solenoid valve, including a valve body and a mounting groove arranged in the valve body, the mounting groove is connected to the air inlet and two air outlets on the valve body at the same time; a valve stem is arranged in the mounting groove and is slidably matched with the valve stem, and a sealing portion is provided on the valve stem for matching with the end of the mounting groove to form a primary seal; a first sealing assembly and a second sealing assembly are respectively provided at both ends of the mounting groove with a transmission connection to the valve stem, and a first connecting port is provided on the first sealing assembly and the second sealing assembly; when the sealing portion contacts the end of the mounting groove, the primary sealing of one of the air outlets is achieved, and through the rotation of the first sealing assembly or the second sealing assembly, the first connecting port and the air outlet are staggered and matched to form a secondary seal.

[0006] Preferably, both ends of the valve stem are provided with a slide groove extending around its axis, and the first sealing assembly and the second sealing assembly are provided with a connecting head that slides with the slide groove. When the valve stem slides along the mounting groove, the connecting head can be driven to move through the slide groove to realize the rotation of the first sealing assembly and the second sealing assembly.

[0007] Preferably, the first sealing assembly and the second sealing assembly are both provided with second communication openings that are symmetrically distributed with respect to the first communication openings.

[0008] Preferably, the sealing part is arranged in the middle of the valve stem, the sealing part is a cylindrical structure, the top and bottom of the sealing part are both provided with an inclined first step, and the first sealing assembly and the second sealing assembly are both provided with a second step corresponding to the inclined first step of the sealing part.

[0009] Preferably, an inclined third step is provided on one end of the valve stem close to the valve seat, and a fourth step cooperating with the third step is provided in the valve seat.

[0010] Preferably, a fifth step is provided on one end of the valve stem away from the valve seat, and a sixth step cooperating with the fifth step is provided on the top of the first sealing assembly.

[0011] Preferably, the first sealing assembly includes a first fixed member and a first rotating member, the first fixed member is fixedly connected to the mounting groove, and the first fixed member is located between the air inlet and one of the air outlets, the first rotating member is rotatably arranged on an end of the first fixed member away from the valve seat, and the first rotating member is transmission-connected to the valve stem.

[0012] Preferably, the second sealing assembly includes a second fixed member and a second rotating member, the second fixed member is fixedly connected to the mounting groove, and the second fixed member is located between the air inlet and one of the air outlets, the second rotating member is rotatably arranged between the second fixed member and the valve seat, and the second rotating member is transmission-connected to the valve stem.

[0013] Preferably, a receiving groove is provided inside the bottom of the valve stem, an elastic member is provided in the receiving groove, and two ends of the elastic member are fixedly connected to the valve body and the receiving groove respectively.

[0014] Preferably, a moving iron core that can move in a vertical direction is provided at the top of the installation groove in the valve body, and a mounting rod fixedly connected to the moving iron core is provided on the valve stem.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This invention utilizes the linear motion of the valve stem to drive the rotation of the first and second sealing assemblies, achieving primary sealing. Furthermore, the rotation of the first and second sealing assemblies causes the first communication port to rotate and offset, achieving secondary sealing. This provides a dual-security mechanism. Even if the solenoid valve experiences minor leakage in the primary seal due to manufacturing tolerances, long-term wear, or temperature fluctuations, the secondary seal formed by the rotation of the first and second sealing assemblies can further prevent airflow leakage, thereby improving the overall sealing performance of the two-position, three-way solenoid valve.

[0017] 2. The present invention utilizes a second communication port to achieve more uniform gas distribution within the first and second sealing assemblies. The two symmetrical first and second communication ports enable faster pressure balancing during solenoid valve switching or operation, reducing localized high or low pressure areas, thereby improving sealing stability and reducing leakage risks.

[0018] 3. The present invention utilizes a first fixed member and a first rotating member. The first fixed member is securely connected to the mounting slot, providing stable positioning and support. The first rotating member, mounted on the first fixed member, is capable of rotating under the influence of the valve stem. This structure separates the fixed and movable functions, ensuring that the first sealing assembly can achieve the necessary angular adjustment during linear movement of the valve stem, thereby forming a secondary seal with other valve body components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of a two-position three-way solenoid valve.

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of a two-position three-way solenoid valve. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of a two-position three-way solenoid valve. Figure 1 .

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of a two-position three-way solenoid valve. Figure 2 .

[0023] Figure 5 This is a schematic diagram of the three-dimensional cross-sectional structure of a two-position three-way solenoid valve. Figure 2 .

[0024] Figure 6 yes Figure 2 Enlarged view of point A in the middle.

[0025] Figure 7 yes Figure 4 Enlarged view of point B in the middle.

[0026] Figure 8 It is a three-dimensional structural schematic diagram of the valve stem, the first sealing component and the second sealing component in a two-position three-way solenoid valve.

[0027] Figure 9 It is a three-dimensional structural diagram of the valve stem in a two-position three-way solenoid valve.

[0028] Figure 10 This is an exploded view of the valve stem, valve seat, first sealing assembly, and second sealing assembly in a two-position three-way solenoid valve.

[0029] The numbers in the figure are:

[0030] 1. Valve body; 11. Mounting groove; 12. Valve seat; 121. Fourth step; 13. Air inlet; 14. Air outlet; 15. First sealing assembly; 151. First connecting port; 152. Connector; 153. Second connecting port; 154. Second step; 155. Sixth step; 156. First fixing member; 157. First rotating member; 16. Second sealing assembly; 161. Second fixing member; 162. Second rotating member; 2. Valve stem; 21. Sealing part; 211. First step; 22. Slide groove; 23. Third step; 24. Fifth step; 25. Accommodating groove; 251. Elastic member; 26. Moving iron core; 261. Mounting rod. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 7 and Figure 10 As shown: a two-position three-way solenoid valve, comprising a valve body 1 and a mounting groove 11 arranged in the valve body 1, the mounting groove 11 is connected to the air inlet 13 and two air outlets 14 on the valve body 1 at the same time; a valve stem 2 is provided in the mounting groove 11 to slide with it, and a sealing portion 21 is provided on the valve stem 2 for cooperating with the end of the mounting groove 11 to form a primary seal; a first sealing component 15 and a second sealing component 16 that are transmission-connected to the valve stem 2 are respectively provided at both ends of the mounting groove 11, and a first connecting port 151 is provided on the first sealing component 15 and the second sealing component 16; when the sealing portion 21 contacts the end of the mounting groove 11, the primary sealing of one of the air outlets 14 is achieved, and through the rotation of the first sealing component 15 or the second sealing component 16, the first connecting port 151 is staggered with the air outlet 14 to form a secondary seal.

[0033] When the solenoid valve is started, the valve stem 2 will slide along the mounting groove 11. At this time, the preset sealing portion 21 on the valve stem 2 will contact the end of the mounting groove 11, thereby physically forming a primary seal. At this time, the sealing portion 21 covers the slot area connected to one of the air outlets 14, thereby achieving preliminary isolation of the airflow.

[0034] Since both the first sealing component 15 and the second sealing component 16 are provided with a first connecting port 151, when the valve stem 2 moves, it will drive the first sealing component 15 and the second sealing component 16 connected thereto, so that the first connecting port 151 of the first sealing component 15 or the second sealing component 16 on the outlet 14 to be blocked will be misaligned with the outlet 14, thereby achieving a secondary seal. Although the outlet 14 has been sealed during the initial sealing in the above manner, the first connecting port 151 is further shifted by the rotation of the first sealing component 15 or the second sealing component 16, so that it forms a "blocking" state in alignment with the outlet 14, thereby achieving a secondary seal.

[0035] Throughout this process, the linear motion of the valve stem 2 is coordinated with the rotational motion of the first sealing assembly 15 or the second sealing assembly 16. This transmission ensures that the rotation of the first sealing assembly 15 or the second sealing assembly 16 is synchronized with the movement of the valve stem 2, thus satisfying the primary sealing requirement and forming a secondary seal through misalignment, providing a dual guarantee.

[0036] A dual sealing method of primary sealing and secondary sealing is adopted. Even if there is a slight leakage in the primary seal due to manufacturing tolerance, long-term wear or temperature change, the secondary seal formed by the rotation of the first sealing component 15 and the second sealing component 16 can further prevent the leakage of airflow, thereby improving the overall sealing performance of the two-position three-way solenoid valve.

[0037] Through the movement of the valve stem 2 and the coordinated rotation of the first sealing component 15 and the second sealing component 16, precise switching and sealing of the inlet and outlet channels can be achieved, effectively controlling the air flow distribution and ensuring that the solenoid valve maintains a stable working state during high-speed response and switching.

[0038] like Figures 2 to 10 As shown: both ends of the valve stem 2 are provided with a slide groove 22 extending around its axis, and the first sealing component 15 and the second sealing component 16 are provided with a connector 152 that slides with the slide groove 22. When the valve stem 2 slides along the mounting groove 11, the connector 152 can be driven to move through the slide groove 22 to realize the rotation of the first sealing component 15 and the second sealing component 16.

[0039] When the valve stem 2 moves linearly along the mounting groove 11, the linear motion can be converted into the rotational motion of the first sealing component 15 and the second sealing component 16 by means of the sliding fit between the slide groove 22 and the connecting head 152, thereby realizing the synchronous rotation of the first sealing component 15 and the second sealing component 16, so that the first connecting port 151 on the first sealing component 15 and the second sealing component 16 forms an offset blocking state with the corresponding air outlet 14, thereby achieving the effect of secondary sealing.

[0040] In addition, this solution can also adopt other transmission mechanisms to convert the linear motion of the valve stem 2 into rotational motion that drives the first sealing component 15 and the second sealing component 16 to rotate, such as a ball transmission mechanism, etc., in which balls are arranged between the valve stem 2 and the first sealing component 15 and the second sealing component 16, and their rolling friction is used to realize the conversion from linear motion to rotational motion. This method can effectively reduce friction resistance and improve transmission efficiency.

[0041] The dual protection of primary and secondary seals ensures that even if the primary seal leaks slightly due to manufacturing tolerances, long-term wear, or temperature fluctuations, the secondary seal created by the rotation of the first sealing component 15 or the second sealing component 16 can still effectively prevent airflow leakage, significantly improving overall sealing performance. This enables precise switching and sealing control between the air inlet 13 and the two air outlets 14, ensuring that the solenoid valve maintains stable operation during high-speed response and frequent switching.

[0042] By using the built-in slide 22 transmission or other linear-rotary conversion mechanisms, complex structures that originally required multiple separate seals can be integrated into one, thereby simplifying the assembly process, improving product consistency, and helping to reduce manufacturing costs.

[0043] like Figures 8 to 10 As shown, the first sealing assembly 15 and the second sealing assembly 16 are both provided with second communication openings 153 symmetrically distributed with respect to the first communication openings 151 .

[0044] The provision of the second communication port 153 allows for a more uniform distribution of gas within the first and second sealing assemblies 15, 16. The two symmetrical first and second communication ports 151, 153 enable faster pressure balance during solenoid valve switching or operation, reducing localized high or low pressure areas, thereby improving sealing stability and reducing leakage risks.

[0045] The symmetrically distributed second communication ports 153 work in conjunction with the first communication port 151 to further compensate for any minor errors in the initial seal, making it easier to effectively block the airflow during the secondary seal, effectively accelerating the solenoid valve's response. This dual-seal structure maintains a strong seal even under high-frequency operation, providing additional sealing protection even in the event of manufacturing tolerances or long-term wear.

[0046] The symmetrical arrangement of the second connecting port 153 and the first connecting port 151 not only makes the internal gas flow path more reasonable, but also reduces the vibration or eccentricity problems caused by asymmetric airflow, thereby improving the overall structural stability and long-term reliability of the solenoid valve.

[0047] like Figures 2 to 10 As shown: the sealing part 21 is arranged in the middle of the valve stem 2, the sealing part 21 is a cylindrical structure, and the top and bottom of the sealing part 21 are both provided with an inclined first step 211, and the first sealing component 15 and the second sealing component 16 are both provided with a second step 154 ​​corresponding to the inclined first step 211 of the sealing part 21.

[0048] The sealing portion 21 is cylindrical in structure, with inclined first steps 211 at both its top and bottom. This creates a large and uniform sealing surface when the sealing portion 21 contacts the end of the valve body 1, enhancing the tightness of the connection between the sealing portion 21 and the groove wall. The inclined first steps 211 help guide fluid pressure distribution, reducing the risk of leakage caused by localized pressure imbalances.

[0049] The setting of the first step 211 can effectively guide the first sealing component 15 and the second sealing component 16 to rotate and cooperate during the movement of the valve stem 2. After the primary seal is formed, the first sealing component 15 and the second sealing component 16 can achieve relative displacement of the first connecting port 151 by matching with the first step 211 of the sealing part 21 during movement, thereby forming a secondary sealing effect, thereby doubly ensuring the sealing performance. Even if the primary seal leaks slightly due to wear or manufacturing tolerance, it can be compensated by the secondary seal.

[0050] like Figures 2 to 10 As shown, an inclined third step 23 is provided on one end of the valve stem 2 close to the valve seat 12 , and a fourth step 121 that cooperates with the third step 23 is provided in the valve seat 12 .

[0051] By cooperating with the inclined third step 23 set at one end of the valve stem 2 close to the valve seat 12 and the fourth step 121 in the valve seat 12, a stable mechanical limit and guide can be formed during the movement of the valve stem 2, ensuring that the valve stem 2 is always in the predetermined position during the switching process, preventing sealing failure or malfunction due to offset.

[0052] The stepped structure forms a series of continuous stepped surfaces at the contact point between the valve stem 2 and the valve seat 12. The angled surfaces create a preloaded state when the seal contacts the valve stem 2, ensuring a tight fit between the sealing surfaces and effectively reducing the risk of leakage caused by manufacturing tolerances or wear. The coordination between the third step 23 and the fourth step 121 can compensate for minor motion errors between the valve stem 2 and the valve seat 12 to a certain extent, reducing relative displacement caused by vibration or temperature changes, and improving the overall operational stability and durability of the solenoid valve.

[0053] like Figures 2 to 10 As shown, a fifth step 24 is provided on the end of the valve stem 2 away from the valve seat 12 , and a sixth step 155 that cooperates with the fifth step 24 is provided on the top of the first sealing assembly 15 .

[0054] The arrangement of the fifth step 24 and the sixth step 155 forms a clear mechanical engagement interface between the valve stem 2 and the first sealing assembly 15. This engagement structure not only helps ensure stable and accurate rotational motion of the first sealing assembly 15 during the linear motion of the valve stem 2, but also precisely locates the transition position of the secondary seal, ensuring repeatability and reliability of the sealing effect.

[0055] The cooperation between the fifth step 24 and the sixth step 155 forms a relatively fixed contact structure when the first sealing assembly 15 rotates, further optimizing the contact between the first sealing assembly 15 and the valve body 1. This helps reduce the risk of leakage caused by slight deviations during movement, thereby achieving a more stringent secondary seal on top of the primary seal, extending the overall life of the solenoid valve and maintaining long-term stable sealing performance.

[0056] like Figures 2 to 10 As shown: the first sealing assembly 15 includes a first fixed member 156 and a first rotating member 157. The first fixed member 156 is fixedly connected to the mounting groove 11, and the first fixed member 156 is located between the air inlet 13 and one of the air outlets 14. The first rotating member 157 is rotatably arranged on the end of the first fixed member 156 away from the valve seat 12, and the first rotating member 157 is transmission-connected to the valve stem 2.

[0057] By setting the first fixing member 156 and the first rotating member 157, the first fixing member 156 is firmly connected to the mounting groove 11, playing the role of stable positioning and support; and the first rotating member 157 set on the first fixing member 156 can be rotated under the transmission action of the valve stem 2. This structure separates the fixing and movement functions, ensuring that the first sealing assembly 15 can achieve the necessary angle adjustment through the first rotating member 157 during the linear movement of the valve stem 2, thereby forming a secondary seal with other components of the valve body 1. Even if there may be slight leakage in the initial seal, the rotation adjustment of the first rotating member 157 can also enable the sealing interface to be aligned, thereby further enhancing the secondary sealing effect. This graded sealing setting provides double protection for the solenoid valve, effectively reducing the risk of leakage caused by wear or tolerance.

[0058] like Figures 2 to 10 As shown: the second sealing assembly 16 includes a second fixed member 161 and a second rotating member 162, the second fixed member 161 is fixedly connected to the mounting groove 11, and the second fixed member 161 is located between the air inlet 13 and one of the air outlets 14, the second rotating member 162 is rotatably arranged between the second fixed member 161 and the valve seat 12, and the second rotating member 162 is transmission-connected to the valve stem 2.

[0059] Because the second fixing member 161 is fixed to the mounting groove 11 and located between the air inlet 13 and one of the air outlets 14, the second sealing assembly 16 is ensured to be in a critical sealing position within the entire valve body 1 structure. When the valve stem 2 moves, the second rotating member 162, through the transmission connection with the valve stem 2, can rotate synchronously and form precise contact with the valve seat 12, ensuring accurate alignment of the sealing interface and thus achieving efficient secondary sealing.

[0060] Second rotating member 162 is located between second fixed member 161 and valve seat 12. Its rotation adjusts the sealing state, ensuring smoother airflow switching between inlet 13 and outlet 14 during movement of valve stem 2. This approach not only effectively blocks unwanted airflow but also ensures proper distribution of gas flow, improving the overall fluid control performance of the solenoid valve.

[0061] Even if there is a slight leakage in the initial seal, the rotation of the second rotating member 162 and its cooperation with the valve seat 12 can further block the leakage channel, thereby achieving double sealing protection and significantly improving the sealing reliability of the solenoid valve system.

[0062] Since the second rotating member 162 is directly connected to the valve stem 2, its rotational movement can respond to the displacement changes of the valve stem 2 in a timely manner. This dynamic response capability helps to reduce the risk of sealing failure caused by factors such as vibration and temperature changes, thereby improving the stability and durability of the entire solenoid valve system.

[0063] like Figures 2 to 6 and Figure 9 As shown, a receiving groove 25 is provided inside the bottom of the valve stem 2, and an elastic member 251 is provided in the receiving groove 25. The two ends of the elastic member 251 are fixedly connected to the valve body 1 and the receiving groove 25 respectively.

[0064] By setting the accommodating groove 25 and the elastic member 251, a built-in valve stem 2 buffer system is formed, which can effectively absorb vibration and impact, reduce the mechanical stress caused by movement or external disturbance, thereby protecting the valve stem 2 and related seals, and extending the service life of the solenoid valve.

[0065] The flexibility of the elastic member 251 can automatically compensate for slight gap changes caused by processing tolerances or assembly errors, ensuring that the first sealing component 15 and the second sealing component 16 always maintain good contact during operation, thereby improving the sealing effect and reducing the risk of leakage.

[0066] After the valve stem 2 is actuated, the elastic member 251 can quickly return to its original shape, resetting the valve stem 2 to a predetermined position, thereby helping to achieve fast and accurate cycle operation and meeting the response application requirements of the solenoid valve.

[0067] like Figures 2 to 5 As shown, a movable iron core 26 that can move in the vertical direction is provided at the top of the installation groove 11 in the valve body 1, and a mounting rod 261 fixedly connected to the movable iron core 26 is provided on the valve stem 2.

[0068] The arrangement of movable iron core 26 and mounting rod 261 ensures that the linear motion of movable iron core 26 is precisely transmitted to valve stem 2, achieving accurate motion guidance and ensuring close coordination and movement between various components. The movable iron core 26 is typically used to receive the magnetic force generated by the electromagnetic coil. Its vertical movement, coupled with the transmission of mounting rod 261, enables fast and stable switching, thus playing a key role in the solenoid valve's seal switching, improving the valve's response speed and seal switching accuracy.

[0069] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and such modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the appended claims.

Claims

1. A two-position three-way solenoid valve, comprising a valve body and a mounting groove provided in the valve body, wherein the mounting groove is connected to an air inlet and two air outlets on the valve body; characterized in that: A valve stem is provided in the mounting groove and is slidably engaged therewith. A sealing portion is provided on the valve stem and is used to cooperate with the end of the mounting groove to form a primary seal. A first sealing assembly and a second sealing assembly are respectively provided at both ends of the mounting groove and are connected to the valve stem in a transmission manner. The first sealing assembly and the second sealing assembly are both provided with a first communication port. When the sealing portion contacts the end of the mounting groove, a primary seal is achieved on one of the air outlets. By rotating the first sealing component or the second sealing component, the first communication port and the air outlet are staggered to form a secondary seal. Both ends of the valve stem are provided with a slide groove extending around its axis. The first sealing assembly and the second sealing assembly are both provided with a connector that slides with the slide groove. When the valve stem slides along the mounting groove, the connector can be driven to move through the slide groove to realize the rotation of the first sealing assembly and the second sealing assembly. The first sealing assembly includes a first fixed member and a first rotating member, the first fixed member is fixedly connected to the mounting groove and is located between the air inlet and one of the air outlets, the first rotating member is rotatably arranged on an end of the first fixed member away from the valve seat, and the first rotating member is drivingly connected to the valve stem; The second sealing assembly includes a second fixed member and a second rotating member. The second fixed member is fixedly connected to the mounting groove, and the second fixed member is located between the air inlet and one of the air outlets. The second rotating member is rotatably arranged between the second fixed member and the valve seat, and the second rotating member is transmission-connected to the valve stem.

2. The two-position three-way solenoid valve according to claim 1, characterized in that: The first sealing assembly and the second sealing assembly are both provided with second communication openings which are symmetrically distributed with respect to the first communication openings.

3. The two-position three-way solenoid valve according to claim 1, characterized in that: The sealing part is arranged in the middle of the valve stem. The sealing part is a cylindrical structure. The top and bottom of the sealing part are both provided with an inclined first step. The first sealing assembly and the second sealing assembly are both provided with a second step corresponding to the inclined first step of the sealing part.

4. The two-position three-way solenoid valve according to claim 1, characterized in that: An inclined third step is provided on one end of the valve stem close to the valve seat, and a fourth step that cooperates with the third step is provided in the valve seat.

5. The two-position three-way solenoid valve according to claim 1, characterized in that: A fifth step is provided on one end of the valve stem away from the valve seat, and a sixth step that cooperates with the fifth step is provided on the top of the first sealing assembly.

6. The two-position three-way solenoid valve according to claim 1, characterized in that: A receiving groove is provided inside the bottom of the valve stem, an elastic member is provided in the receiving groove, and two ends of the elastic member are fixedly connected to the valve body and the receiving groove respectively.

7. The two-position three-way solenoid valve according to claim 1, characterized in that: A moving iron core which can move in a vertical direction is arranged at the top of the installation groove in the valve body, and a mounting rod which is fixedly connected with the moving iron core is arranged on the valve stem.

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