Two-position three-way electromagnetic valve

Abstract

The present application relates to the technical field of electromagnetic valve, specifically relates to a two-position three-way electromagnetic valve, through setting rotatable rotary valve core in valve cavity, and setting first communication groove and second communication groove on the circumferential surface of rotary valve core, converting the linear motion of electromagnetic drive assembly valve rod into the rotary motion of rotary valve core by using motion conversion mechanism, make rotary valve core switch between first working angle and second working angle, so that the communication switch between air inlet and working port or working port and exhaust port is realized, the rotary valve core replaces two pistons, two valve ports and two chambers arranged in a straight line in the prior art, greatly simplifies the internal structure of valve body, shortens the axial dimension of valve body, reduces the volume of valve body, and reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, specifically to a two-position three-way solenoid valve. Background Technology

[0002] Two-position three-way solenoid valves are commonly used directional control valves in fluid control systems. They typically have three fluid interfaces: an inlet, a working port, and an outlet. By changing the working position of the valve core, different connection relationships can be switched between the three interfaces, thereby realizing the directional control of the actuator. They are widely used in pneumatic control systems, automation equipment, and industrial robots.

[0003] In the prior art, for example, a piston-type two-position three-way solenoid valve disclosed in Chinese utility model patent (authorization announcement number CN223635485U) has a valve body comprising a valve chamber, a piston, a spring seat, two chambers, and two valve ports. During operation, the pressure in the two chambers changes under external force, pushing the corresponding piston and spring seat to move and close or open the corresponding valve ports, thereby switching between the inlet and outlet ports or between the outlet and exhaust port. However, the drawback of the aforementioned two-position three-way solenoid valve is that, because its piston, spring seat, two valve ports, and two chambers are arranged sequentially along the same straight line, the axial length of the valve body is relatively large, resulting in a large overall volume. This not only increases material and processing costs but also causes inconvenience in applications with limited installation space.

[0004] Therefore, how to simplify the internal structure of a two-position three-way solenoid valve and reduce the valve body volume has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problems existing in the prior art, a two-position three-way solenoid valve is provided. By setting a rotatable rotary valve core in the valve cavity, and opening a first connecting groove and a second connecting groove on the circumferential surface of the rotary valve core, a motion conversion mechanism is used to convert the linear motion of the valve stem of the electromagnetic drive assembly into the rotational motion of the rotary valve core, so that the rotary valve core switches between a first working angle and a second working angle, thereby realizing the connection switching between the air inlet and the working port or the working port and the exhaust port. The rotary valve core replaces the two pistons, two valve ports and two chambers arranged in a straight line in the prior art, which greatly simplifies the internal structure of the valve body, shortens the axial dimension of the valve body, reduces the volume of the valve body and reduces the production cost.

[0006] To address the problems of existing technologies, this invention provides a two-position three-way solenoid valve, comprising: a valve body externally having an air inlet, a working port, and an exhaust port communicating with a valve cavity within the valve body; an electromagnetic drive assembly disposed on the valve body and having a valve stem extending into the valve cavity; a rotary valve core rotatably disposed in the valve cavity and having a first working angle and a second working angle, wherein a first connecting groove and a second connecting groove are provided on the circumferential surface of the rotary valve core, wherein when the rotary valve core is at the first working angle, the first connecting groove communicates the air inlet and the working port, and when the rotary valve core is at the second working angle, the second connecting groove communicates the working port and the exhaust port; and a motion conversion mechanism disposed between the valve stem and the rotary valve core for converting the linear motion of the valve stem into the rotational motion of the rotary valve core.

[0007] Preferably, the rotary valve core has a hollow structure, and its inner wall has an arc-shaped guide groove coaxial with it; the motion conversion mechanism includes a drive pin, which is disposed on the valve stem and extends outward along the radial direction of the valve stem, and the end of the drive pin extends into the arc-shaped guide groove and slides in cooperation with the arc-shaped guide groove.

[0008] Preferably, the valve body further includes a drive chamber, and the electromagnetic drive assembly includes: a piston, slidably disposed in the drive chamber, the piston dividing the drive chamber into an upper chamber and a lower chamber; the valve body also includes a pneumatic channel connecting the upper chamber and the air inlet; the top end of the valve stem extends into the lower chamber and is fixedly connected to the piston; the bottom end of the valve stem extends into the valve cavity of the valve body and is connected to the rotary valve core; and an electromagnet is disposed on the valve body, its output rod extending into the pneumatic channel for controlling the opening and closing of the pneumatic channel.

[0009] Preferably, the valve body has a mounting cavity, and a partition ring is provided in the mounting cavity. The partition ring divides the mounting cavity into two parts: the drive cavity and the valve cavity. The valve stem is coaxially slidably engaged with the partition ring.

[0010] Preferably, the valve stem is coaxially splined with the separator ring.

[0011] Preferably, an elastic reset element is provided between the valve stem and the bottom end of the valve cavity.

[0012] Preferably, the valve body includes an upper valve seat and a lower valve seat, the separator ring is disposed between the upper valve seat and the lower valve seat, and a locking block that engages with the separator ring is provided at the upper port of the lower valve seat.

[0013] Preferably, the air pressure channel includes an air intake channel communicating with the air inlet and a pressure channel communicating with the upper chamber. The valve body is also provided with a sealing cavity for connecting the air intake channel and the pressure channel. The output rod of the electromagnet extends into the sealing cavity and abuts against the outlet of the air intake channel.

[0014] Preferably, the output rod of the electromagnet is further provided with an exhaust groove extending radially therefrom, and the valve body is further provided with a pressure relief hole communicating with the sealing cavity and the outside of the valve body. When the end of the output rod of the electromagnet blocks the outlet of the air intake channel, the exhaust groove connects the pressure relief hole and the sealing cavity. When the end of the output rod of the electromagnet is far away from the outlet of the air intake channel, the circumferential surface of the output rod of the electromagnet closes the pressure relief hole.

[0015] Preferably, a sealing assembly is fitted on the circumferential surface of the rotary valve core. The sealing assembly includes two sealing rings and two sealing strips. The two sealing rings are coaxially fitted on both ends of the rotary valve core, and the two sealing strips extend along the axial direction of the rotary valve core and connect between the two sealing rings. The two sealing rings and the two sealing strips separate the outer circumferential surface of the rotary valve core from the inner wall of the valve cavity into two independent sealing chambers. The first connecting groove and the second connecting groove are located in the two sealing chambers, respectively.

[0016] The advantages of this application compared to the prior art are: This application replaces the two pistons, two valve ports, and two chambers arranged in a straight line in the prior art with a rotary valve core, simplifying the complex linear motion control system to the rotational control of a single rotary valve core. This significantly reduces the number of moving parts and simplifies the internal structure of the valve body. The switching method of the rotary valve core eliminates the need to provide axial movement space for the two pistons within the valve body. Each interface can be arranged radially or circumferentially along the valve body, effectively shortening the axial length of the valve body, reducing the overall volume, lowering material and processing costs, and facilitating placement in applications with limited installation space. The linear motion of the valve stem is converted into the rotational motion of the rotary valve core via a motion conversion mechanism. The drive method is simple and efficient, and the design of the motion conversion mechanism enables efficient conversion between linear and rotational motion. Simultaneously, the sealing assembly divides the valve cavity into two independent sealed chambers, effectively preventing gas flow between the inlet, working port, and exhaust port, improving the sealing reliability and operational stability of the solenoid valve. Attached Figure Description

[0017] Figure 1 This is a perspective view of a two-position three-way solenoid valve according to the present invention.

[0018] Figure 2 This is a three-dimensional sectional view of a two-position three-way solenoid valve according to the present invention.

[0019] Figure 3 This is a schematic diagram of a two-position three-way solenoid valve of the present invention when it is de-energized.

[0020] Figure 4 yes Figure 3 A magnified view of part A.

[0021] Figure 5 This is a schematic diagram of a two-position three-way solenoid valve of the present invention when energized.

[0022] Figure 6 This is an exploded perspective view of a two-position three-way solenoid valve according to the present invention.

[0023] Figure 7 This is a perspective view of the rotary valve core and piston in a two-position three-way solenoid valve according to the present invention.

[0024] Figure 8 This is an exploded perspective view of the rotary valve core and piston in a two-position three-way solenoid valve according to the present invention.

[0025] Figure 9 This is an exploded perspective view of the rotary valve core and sealing assembly in a two-position three-way solenoid valve according to the present invention.

[0026] Figure 10 This is a perspective view of the rotary valve core in a two-position three-way solenoid valve according to the present invention.

[0027] The following are the labels in the diagram: 1. Valve body; 11. Air inlet; 12. Working port; 13. Exhaust port; 141. Upper chamber; 142. Lower chamber; 151. Air inlet passage; 152. Pressure passage; 16. Upper valve seat; 17. Lower valve seat; 171. Locking block; 18. Sealing chamber; 19. Pressure relief hole; 2. Electromagnetic drive assembly; 21. Valve stem; 22. Output rod; 221. Exhaust groove; 23. Piston; 24. Electromagnet; 25. Separating ring; 26. Elastic reset element; 3. Rotary valve core; 31. First connecting groove; 32. Second connecting groove; 33. Arc-shaped guide groove; 34. Sealing assembly; 341. Sealing ring; 342. Sealing strip; 4. Motion conversion mechanism. Detailed Implementation

[0028] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 3 , Figure 4As shown, a two-position three-way solenoid valve includes a valve body 1, an electromagnetic drive assembly 2, a rotary valve core 3, and a motion conversion mechanism 4. The valve body 1 has an air inlet 11, a working port 12, and an exhaust port 13 that communicate with the valve cavity inside the valve body 1. The electromagnetic drive assembly 2 is mounted on the valve body 1 and has a valve stem 21 extending into the valve cavity. The rotary valve core 3 is rotatably mounted within the valve cavity and has a first working angle and a second working angle. A first connecting groove 31 and a second connecting groove 32 are formed on the circumferential surface of the rotary valve core 3. When the rotary valve core 3 is at the first working angle, the first connecting groove 31 connects the air inlet 11 to the working port 12; when the rotary valve core 3 is at the second working angle, the second connecting groove 32 connects the working port 12 to the exhaust port 13. The motion conversion mechanism 4 is located between the valve stem 21 and the rotary valve core 3, and is used to convert the linear motion of the valve stem 21 into the rotational motion of the rotary valve core 3.

[0030] During operation, after the electromagnetic drive assembly 2 is energized, it drives the valve stem 21 to move linearly along its axis. The valve stem 21 transmits the linear motion to the rotary valve core 3 through the motion conversion mechanism 4, driving the rotary valve core 3 to rotate around its axis. The rotary valve core 3 switches between a first working angle and a second working angle. When the rotary valve core 3 rotates to the first working angle, the first connecting groove 31 aligns with the air inlet 11 and the working port 12, connecting the air inlet 11 and the working port 12, and the working port 12 outputs pressurized gas. When the rotary valve core 3 rotates to the second working angle, the second connecting groove 32 aligns with the working port 12 and the exhaust port 13, connecting the working port 12 and the exhaust port 13, and the working port 12 releases pressure. After the electromagnetic drive assembly 2 is de-energized, the valve stem 21 resets, driving the rotary valve core 3 to rotate back to the initial working angle, completing one reversing cycle.

[0031] like Figure 8 and Figure 10 As shown, the rotary valve core 3 has a hollow structure, and its inner wall has an arc-shaped guide groove 33 coaxial with it; the motion conversion mechanism 4 includes a drive pin, which is disposed on the valve stem 21 and extends outward along the radial direction of the valve stem 21, and the end of the drive pin extends into the arc-shaped guide groove 33 and slides in cooperation with the arc-shaped guide groove 33.

[0032] The electromagnetic drive assembly 2 drives the valve stem 21 to move linearly along the axial direction, and the valve stem 21 drives the drive pin to move synchronously axially. The end of the drive pin slides in the arc-shaped guide groove 33. Since the arc-shaped guide groove 33 extends circumferentially along the rotary valve core 3, its arc surface converts the axial linear motion of the drive pin into the circumferential rotational motion of the rotary valve core 3, driving the rotary valve core 3 to rotate around its axis, thereby realizing the switching of the working angle.

[0033] The drive pin and arc-shaped guide groove 33 adopt a slider-guide groove pair structure, consisting of only two parts (drive pin + arc-shaped guide groove). Compared with the existing piston-stop type solution (involving two pistons, two valve ports, and a total of four types of main moving parts), the number of moving parts is relatively reduced, effectively reducing manufacturing costs and assembly difficulty. The arc-shaped guide groove 33 directly converts the linear motion of the valve stem 21 into the rotational motion of the rotary valve core 3, resulting in a short transmission path, low energy loss, and fast response speed.

[0034] like Figures 5 to 8 As shown, the valve body 1 is further provided with a drive chamber. The electromagnetic drive assembly 2 includes: a piston 23, which is slidably disposed in the drive chamber. The piston 23 divides the drive chamber into an upper chamber 141 and a lower chamber 142. The valve body 1 is also provided with a pneumatic channel connecting the upper chamber 141 and the air inlet 11. The top end of the valve stem 21 extends into the lower chamber 142 and is fixedly connected to the piston 23. The bottom end of the valve stem 21 extends into the valve cavity of the valve body 1 and is connected to the rotary valve core 3. An electromagnet 24 is disposed on the valve body 1, and its output rod 22 extends into the pneumatic channel for controlling the opening and closing of the pneumatic channel.

[0035] When electromagnet 24 is energized, its output rod 22 rises, switching the pneumatic channel from an open to a closed state. High-pressure gas at inlet 11 enters the upper chamber 141 through the pneumatic channel, pushing piston 23 downwards. Piston 23 then moves valve stem 21 and rotary valve core 3, completing the switching of the working position. When electromagnet 24 is de-energized, output rod 22 resets, the pneumatic channel disconnects, and the gas in upper chamber 141 is discharged through the pressure relief channel. Piston 23 and valve stem 21 reset under the action of the reset element. Since the pneumatic channel only needs to be controlled by output rod 22 of electromagnet 24, and output rod 22 only needs to overcome the blockage of the pneumatic channel without directly pushing piston 23, the stroke of output rod 22 can be significantly shortened, and the size and power consumption of electromagnet 24 can be reduced accordingly.

[0036] The output rod 22 of the electromagnet 24 is only used to control the opening and closing of the air pressure channel, rather than directly driving the piston 23. The stroke of the output rod 22 is significantly shortened, which improves the response speed of the electromagnet 24 and shortens the switching time of the solenoid valve. The shortened stroke of the output rod 22 allows for a corresponding reduction in the size of the electromagnet 24, reducing its manufacturing cost and facilitating its compact arrangement on the valve body 1. By using pilot air pressure to drive the piston 23, and utilizing the air pressure of the inlet 11 itself as a power source, the electromagnet 24 only needs to provide a small electromagnetic force to control the opening and closing of the air pressure channel, reducing the output force requirement of the electromagnet 24 and further reducing its size and power consumption.

[0037] like Figure 5 and Figure 8As shown, the valve body 1 has an installation cavity, and a partition ring 25 is provided in the installation cavity. The partition ring 25 divides the installation cavity into two parts: the drive cavity and the valve cavity. The valve stem 21 is coaxially slidably engaged with the partition ring 25.

[0038] The separator ring 25 axially separates the drive chamber and the valve chamber into two relatively independent chambers, through which the valve stem 21 passes and slides back and forth. The separator ring 25 guides and supports the movement of the valve stem 21, ensuring that the valve stem 21 remains coaxial with the valve body 1 during axial movement and guaranteeing the accuracy of the valve stem 21's movement. Simultaneously, the separator ring 25 isolates the gas between the drive chamber and the valve chamber, preventing the gas in the drive chamber from flowing between the two chambers.

[0039] The partition ring 25 divides the mounting cavity into two independent functional areas: a drive cavity and a valve cavity. This spatially separates the electromagnetic drive section from the fluid control section, clearly defining the function of each chamber and facilitating their separate design and manufacturing. The sliding fit between the partition ring 25 and the valve stem 21 provides precise guidance for the movement of the valve stem 21, ensuring that the valve stem 21 remains coaxial with the valve body 1 during axial movement and preventing movement jamming or sealing failure caused by valve stem 21 misalignment.

[0040] like Figure 5 As shown, the valve stem 21 is coaxially splined with the separator ring 25.

[0041] Driven by the piston 23, the valve stem 21 reciprocates linearly along the axial direction. The spline fit restricts the circumferential rotational freedom of the valve stem 21, leaving it with only axial movement freedom. The drive pin moves axially synchronously with the valve stem 21. Since the valve stem 21 cannot rotate, the orientation of the drive pin end remains fixed, ensuring accurate engagement between the drive pin and the arc-shaped guide groove 33. This allows the motion conversion mechanism 4 to precisely convert the linear motion of the valve stem 21 into the rotational motion of the rotary valve core 3.

[0042] like Figure 5 As shown, an elastic reset element 26 is provided between the valve stem 21 and the bottom end of the valve cavity.

[0043] When the electromagnet 24 is energized and the pilot air pressure pushes the piston 23 and valve stem 21 downward, the valve stem 21 compresses the elastic reset element 26, causing the elastic reset element 26 to store elastic potential energy. When the electromagnet 24 is de-energized and the pilot air pressure in the upper chamber 141 is removed, the elastic reset element 26 releases its elastic potential energy, pushing the valve stem 21 upward to reset, and causing the piston 23 and the rotary valve core 3 to synchronously reset to the initial working angle.

[0044] like Figure 5 and Figure 6As shown, the valve body 1 includes an upper valve seat 16 and a lower valve seat 17. The separator ring 25 is disposed between the upper valve seat 16 and the lower valve seat 17. A locking block 171 that engages with the separator ring 25 is provided at the upper port of the lower valve seat 17.

[0045] During assembly, the separator ring 25 is first placed at the upper port of the lower valve seat 17, so that the locking block 171 is engaged and positioned with the separator ring 25. Then, the upper valve seat 16 and the lower valve seat 17 are fixedly connected, and the separator ring 25 is clamped and fixed between the upper valve seat 16 and the lower valve seat 17. The valve stem 21 passes through the separator ring 25 and slides within it. The separator ring 25 divides the inner cavity of the valve body 1 into a drive cavity located in the upper valve seat 16 and a valve cavity located in the lower valve seat 17.

[0046] The valve body 1 adopts a split structure of upper valve seat 16 and lower valve seat 17, which reduces the processing difficulty and manufacturing cost of individual parts. Each component can be processed separately and then assembled, improving production efficiency. The separator ring 25 is set as an independent part between the upper valve seat 16 and the lower valve seat 17, which is convenient for processing and replacement. Different materials or specifications of separator ring 25 can be selected according to different working conditions, which improves the flexibility of design.

[0047] like Figure 4 As shown, the air pressure channel includes an air intake channel 151 communicating with the air inlet 11 and a pressure channel 152 communicating with the upper chamber 141. The valve body 1 is also provided with a sealing cavity 18 for connecting the air intake channel 151 and the pressure channel 152. The output rod 22 of the electromagnet 24 extends into the sealing cavity 18 and abuts against the outlet of the air intake channel 151.

[0048] When the electromagnet 24 is de-energized, the end of its output rod 22 abuts against the outlet of the air intake channel 151, blocking the air intake channel 151. High-pressure gas from the air inlet 11 cannot enter the blocking chamber 18 through the air intake channel 151, and the pressure channel 152 remains depressurized. The upper chamber 141 is pressure-free, and the piston 23 and valve stem 21 maintain their initial positions under the action of the elastic reset element 26. When the electromagnet 24 is energized, the output rod 22 moves upward, leaving the outlet of the air intake channel 151. The air intake channel 151 then connects with the blocking chamber 18, allowing high-pressure gas to enter the blocking chamber 18 through the air intake channel 151 and then through the pressure channel 152 into the upper chamber 141, pushing the piston 23 and valve stem 21 to move, thus completing the switching of the working position.

[0049] The output rod 22 of the electromagnet 24 directly abuts against the outlet of the air intake channel 151, controlling the opening and closing of the pilot air passage by end face sealing. The output rod 22 directly abuts against the outlet of the air intake channel 151 with its end face, forming an end face type shut-off sealing pair. Compared with the pilot valve core and valve seat structure that are additionally set in the conventional pilot solenoid valve, the number of pilot control parts is less, reducing the number of sealing parts in the valve core movement direction.

[0050] like Figure 4 As shown, the output rod 22 of the electromagnet 24 is also provided with an exhaust groove 221 extending radially therefrom, and the valve body 1 is also provided with a pressure relief hole 19 connecting the sealing cavity 18 and the outside of the valve body 1. When the end of the output rod 22 of the electromagnet 24 blocks the outlet of the air intake channel 151, the exhaust groove 221 connects the pressure relief hole 19 and the sealing cavity 18. When the end of the output rod 22 of the electromagnet 24 is far away from the outlet of the air intake channel 151, the circumferential surface of the output rod 22 of the electromagnet 24 closes the pressure relief hole 19.

[0051] When the electromagnet 24 is energized, the output rod 22 moves upward, and the end of the output rod 22 leaves the outlet of the air intake channel 151. The air intake channel 151 is connected to the sealing chamber 18. High-pressure gas enters the upper chamber 141 through the air intake channel 151, the sealing chamber 18, and the pressure channel 152, pushing the piston 23 and the valve stem 21 to move, completing the switching. At this time, the circumferential surface of the output rod 22 seals the pressure relief hole 19 to prevent high-pressure gas from leaking from the pressure relief hole 19. When the electromagnet 24 is de-energized, the output rod 22 moves downward to reset, and the end of the output rod 22 re-seals the outlet of the air intake channel 151, cutting off the supply of high-pressure gas. At the same time, the exhaust groove 221 moves with the output rod 22 to a position connected to the pressure relief hole 19 and the sealing chamber 18. The gas in the sealing chamber 18 and the pressure channel 152 is discharged to the outside of the valve body 1 through the exhaust groove 221 and the pressure relief hole 19, causing the air pressure in the upper chamber 141 to drop rapidly. The piston 23 resets under the action of the elastic reset element 26. By utilizing the combination of the exhaust groove 221 on the output rod 22 and the pressure relief hole 19, the sealing chamber 18 and the upper chamber 141 are automatically depressurized quickly after the electromagnet 24 is de-energized, without the need for a separate pressure relief valve or pressure relief channel, resulting in a simple structure.

[0052] like Figure 9As shown, a sealing assembly 34 is fitted on the circumferential surface of the rotary valve core 3. The sealing assembly 34 includes two sealing rings 341 and two sealing strips 342. The two sealing rings 341 are coaxially fitted on both ends of the rotary valve core 3, and the two sealing strips 342 extend along the axial direction of the rotary valve core 3 and connect between the two sealing rings 341. The two sealing rings 341 and the two sealing strips 342 separate the outer circumferential surface of the rotary valve core 3 from the inner wall of the valve cavity into two independent sealing chambers. The first connecting groove 31 and the second connecting groove 32 are located in the two sealing chambers respectively.

[0053] A sealing ring 341 forms a circumferential seal at both ends of the rotary valve core 3 to prevent gas leakage along the axial end of the rotary valve core 3. A sealing strip 342 forms a circumferential separation seal on the axial extension of the rotary valve core 3, dividing the annular space between the outer circumferential surface of the rotary valve core 3 and the inner wall of the valve cavity into two independent sealing chambers. The first connecting groove 31 and the second connecting groove 32 are located in the two independent sealing chambers respectively. When the rotary valve core 3 rotates to the first working angle, the first connecting groove 31 connects to the air inlet 11 and working port 12 corresponding to its sealing chamber. When the rotary valve core 3 rotates to the second working angle, the second connecting groove 32 connects to the air inlet 11 and working port 12 corresponding to its sealing chamber. The two sealing chambers are independent of each other, avoiding gas flow between the air inlet 11, working port 12 and exhaust port 13. The sealing ring 341 and the sealing strip 342 form an integrated sealing assembly 34, which divides the annular space between the circumferential surface of the rotary valve core 3 and the inner wall of the valve cavity into two independent sealing chambers, effectively preventing cross-flow between different fluid channels and improving the sealing performance of the solenoid valve.

[0054] The above embodiments only illustrate one or more implementations 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 those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A two-position three-way solenoid valve, characterized in that, include: The valve body has an air inlet, a working port, and an exhaust port that connect to the valve cavity inside the valve body. An electromagnetic drive assembly is disposed on the valve body and has a valve stem extending into the valve cavity; A rotary valve core is rotatably disposed in the valve cavity and has a first working angle and a second working angle. A first connecting groove and a second connecting groove are provided on the circumferential surface of the rotary valve core. When the rotary valve core is at the first working angle, the first connecting groove connects the air inlet and the working port. When the rotary valve core is at the second working angle, the second connecting groove connects the working port and the exhaust port. A motion conversion mechanism is disposed between the valve stem and the rotary valve core, for converting the linear motion of the valve stem into the rotational motion of the rotary valve core.

2. A two-position three-way solenoid valve according to claim 1, characterized in that, The rotary valve core has a hollow structure, and its inner wall has an arc-shaped guide groove coaxial with it; the motion conversion mechanism includes a drive pin, which is disposed on the valve stem and extends outward along the radial direction of the valve stem, and the end of the drive pin extends into the arc-shaped guide groove and slides in cooperation with the arc-shaped guide groove.

3. A two-position three-way solenoid valve according to claim 1, characterized in that, The valve body is further provided with a drive chamber, and the electromagnetic drive assembly includes: A piston is slidably disposed in the drive chamber, which divides the drive chamber into an upper chamber and a lower chamber. The valve body is also provided with a pressure channel connecting the upper chamber and the air inlet. The top end of the valve stem extends into the lower chamber and is fixedly connected to the piston, and the bottom end of the valve stem extends into the valve cavity of the valve body and is connected to the rotary valve core. An electromagnet is mounted on the valve body, and its output rod extends into the pneumatic channel to control the opening and closing of the pneumatic channel.

4. A two-position three-way solenoid valve according to claim 3, characterized in that, The valve body has an installation cavity, and a partition ring is provided in the installation cavity. The partition ring divides the installation cavity into two parts: the drive cavity and the valve cavity. The valve stem slides coaxially with the partition ring.

5. A two-position three-way solenoid valve according to claim 4, characterized in that, The valve stem is coaxially splined with the separator ring.

6. A two-position three-way solenoid valve according to claim 3, characterized in that, An elastic reset element is provided between the valve stem and the bottom end of the valve cavity.

7. A two-position three-way solenoid valve according to claim 4, characterized in that, The valve body includes an upper valve seat and a lower valve seat, the separator ring is disposed between the upper valve seat and the lower valve seat, and a locking block that engages with the separator ring is provided at the upper port of the lower valve seat.

8. A two-position three-way solenoid valve according to any one of claims 3-7, characterized in that, The air pressure channel includes an air intake channel communicating with the air inlet and a pressure channel communicating with the upper chamber. The valve body is also provided with a sealing cavity for connecting the air intake channel and the pressure channel. The output rod of the electromagnet extends into the sealing cavity and abuts against the outlet of the air intake channel.

9. A two-position three-way solenoid valve according to claim 8, characterized in that, The output rod of the electromagnet is also provided with an exhaust groove extending radially therefrom, and the valve body is also provided with a pressure relief hole communicating with the sealing cavity and the outside of the valve body. When the end of the output rod of the electromagnet blocks the outlet of the air intake channel, the exhaust groove connects the pressure relief hole and the sealing cavity. When the end of the output rod of the electromagnet is far away from the outlet of the air intake channel, the circumferential surface of the output rod of the electromagnet closes the pressure relief hole.

10. A two-position three-way solenoid valve according to any one of claims 1-7, characterized in that, A sealing assembly is fitted on the circumferential surface of the rotary valve core. The sealing assembly includes two sealing rings and two sealing strips. The two sealing rings are coaxially fitted on both ends of the rotary valve core, and the two sealing strips extend along the axial direction of the rotary valve core and connect between the two sealing rings. The two sealing rings and the two sealing strips separate the outer circumferential surface of the rotary valve core from the inner wall of the valve cavity into two independent sealing chambers. The first connecting groove and the second connecting groove are located in the two sealing chambers respectively.

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