Four-way three-position solenoid valve

Abstract

The present invention discloses a four-way three-position solenoid valve, which comprises a valve seat provided with an inlet and two outlets; a driving assembly including an electromagnetic driving part and an elastic driving part, the electromagnetic driving part including two independently operating upper electromagnetic driving members and lower electromagnetic driving members, and the driving directions of the upper electromagnetic driving member and the lower electromagnetic driving member being opposite; a switching component including a rocker arm and a direct-acting valve, the middle part of the rocker arm being pivotally connected to the upper electromagnetic driving member through a shaft rod, one end of which can open and close one outlet under the action of the lower electromagnetic driving member, and the other end can open and close the other outlet under the action of the elastic driving part; the direct-acting valve is fixedly connected to the middle part of the rocker arm and can open and close the inlet under the action of the upper electromagnetic driving member; when both electromagnetic driving members are operating, the elastic driving part is in a compressed state, and the inlet and the two outlets are all in an open state. The four-way three-position solenoid valve of the present invention has a more compact structure while ensuring the four-way three-position function.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a four-way three-way solenoid valve. Background Art

[0002] A solenoid valve is a basic automation component that controls fluids electromagnetically and is often used in industrial control systems to adjust the direction, flow rate, speed, or other parameters of fluids. Among them, a commonly used three-way solenoid valve usually includes one inlet and two outlets. However, the existing three-way solenoid valves are usually two-position valves, and the fluid entering the inlet can only flow out through one of the two outlets. That is, when the inlet is connected to one outlet, the other outlet is in a closed state. When it is necessary to close or open both outlets simultaneously, two two-way two-position valves need to be used in combination to achieve the four-way three-way function. However, this method not only has a cumbersome assembly but also a relatively large overall installation volume of the valve. Summary of the Invention

[0003] To overcome the above disadvantages, the purpose of the present invention is to provide a four-way three-way solenoid valve that is more compact in structure while ensuring the four-way three-way function.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a four-way three-way solenoid valve, comprising

[0005] a valve seat, which is provided with one inlet and two outlets, and the two outlets are located on both sides of the inlet;

[0006] a driving assembly, including an electromagnetic driving part and an elastic driving part that are used in cooperation. The electromagnetic driving part includes two independently operating upper electromagnetic driving parts and lower electromagnetic driving parts, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite;

[0007] a closing and opening assembly, including a rocker arm and a direct-acting valve. The middle part of the rocker arm is pivotally connected to the upper electromagnetic driving part through a shaft rod. One end of the rocker arm can open and close one outlet under the action of the lower electromagnetic driving part, and the other end can open and close the other outlet under the action of the elastic driving part; the direct-acting valve is fixedly connected to the middle part of the rocker arm and can open and close the inlet under the action of the upper electromagnetic driving part;

[0008] When both electromagnetic driving parts are operating, the elastic driving part is in a compressed state, and the inlet and the two outlets are all in an open state.

[0009] The beneficial effects of the present invention are as follows:

[0010] The middle part of the rocker arm is pivotally connected to the upper electromagnetic driving member through a shaft rod, so that the upper electromagnetic driving member can drive the rocker arm and the direct-acting valve located in the middle of the rocker arm to move directly (up and down), so as to realize the opening and closing of the inlet; the two ends of the rocker arm swing under the action of the lower electromagnetic driving member and the elastic driving part respectively to realize the opening and closing of the two outlets; the direct-acting valve is integrated on the rocker arm, and the cooperation of the upper electromagnetic driving member, the lower electromagnetic driving member and the elastic driving part realizes the function of four-way three-position: when both electromagnetic driving members are operating, the driving forces of the two electromagnetic driving members and the force of the elastic driving part can cancel each other out, so that the rocker arm is in a relatively balanced state. At this time, the inlet and the two outlets are both in the open state; when both electromagnetic driving members are not operating, the rocker arm is only affected by the force of the elastic driving part. At this time, one end of the rocker arm in contact with the elastic driving part swings downward under the action of the elastic driving part to close the corresponding outlet, and the other outlet is in the open state with the opening; when only the lower electromagnetic driving member is operating, one end of the rocker arm in contact with the lower electromagnetic driving member swings downward under the action of the lower electromagnetic driving member to close the corresponding outlet, and the other outlet is in the open state with the opening; when only the upper electromagnetic driving member is operating, the shaft rod can drive the rocker arm and the direct-acting valve to move up synchronously, so that the direct-acting valve moves up to close the inlet.

[0011] The direct-acting valve is integrated on the rocker arm, and the cooperation drive of the upper electromagnetic driving member, the lower electromagnetic driving member and the elastic driving part realizes the function of four-way three-position, effectively avoiding the cumbersome operation of assembling two two-way valves, and the overall structure is more compact, which can save installation space.

[0012] Furthermore, the electromagnetic driving part includes a housing fixed on the valve seat. Inside the housing, there are an upper electromagnetic driving member and a lower electromagnetic driving member symmetrically arranged along the vertical direction. Both the upper electromagnetic driving member and the lower electromagnetic driving member include an electromagnetic coil, a fixed iron core, a movable iron core and a return spring. The movable iron core can move in the direction close to the fixed iron core under the action of the electromagnetic coil; when both electromagnetic coils are energized, the two movable iron cores move away from each other.

[0013] When the electromagnetic coils of the upper electromagnetic driving member and the lower electromagnetic driving member are both energized, the two movable iron cores can move away from each other. That is, the movable iron core of the upper electromagnetic driving member moves upward, and applies an upward driving force to the rocker arm through the shaft rod. The movable iron core of the lower electromagnetic driving member moves downward and applies a downward driving force to one end of the rocker arm, while the spring driving part applies a downward return force to the other end of the rocker arm. At this time, the rocker arm is balanced under the action of the upper electromagnetic driving member, the lower electromagnetic driving member and the spring driving part, both outlets are in the open state, and the direct-acting valve stays at the position where the inlet is in the open state. Assume that the rocker arm is at the first height at this time;

[0014] It should be noted that when the electromagnetic coil of the upper electromagnetic driving member or the lower electromagnetic driving member is energized, both movable iron cores can be subjected to the electromagnetic driving force of the same electromagnetic coil. However, due to their distances from the electromagnetic coil, the driving forces received by the two movable iron cores from the same electromagnetic coil are different. That is, the electromagnetic driving force of the electromagnetic coil of the upper electromagnetic driving member on the movable iron core of the upper electromagnetic driving member is greater than its electromagnetic driving force on the movable iron core of the lower electromagnetic driving member; the electromagnetic driving force of the electromagnetic coil of the lower electromagnetic driving member on the movable iron core of the lower electromagnetic driving member is greater than its electromagnetic driving force on the movable iron core of the upper electromagnetic driving member.

[0015] When only the electromagnetic coil of the upper electromagnetic driving member is energized, both movable iron cores receive an upward driving force. At this time, since the upward driving force received by the rocker arm is greater than the downward restoring force applied by the spring driving portion, the rocker arm can move upward above the first height, so that the direct-acting valve can move to a position where the inlet is in a closed state.

[0016] When only the electromagnetic coil of the lower electromagnetic driving member is energized, both movable iron cores receive a downward driving force. At this time, the rocker arm can move downward below the first height, and the direct-acting valve moves downward to a position where the inlet is in an open state; also, since the driving force received by the movable iron core of the lower electromagnetic driving member is greater than the driving force received by the movable iron core of the upper electromagnetic driving member, at this time, one end of the rocker arm connected to the lower electromagnetic driving member can swing downward to close the corresponding outlet, and the other end swings upward to open the other outlet.

[0017] When the electromagnetic coils of both the upper electromagnetic driving member and the lower electromagnetic driving member are not energized, the rocker arm is only subjected to the restoring force of the spring driving portion. At this time, one end of the rocker arm connected to the spring driving portion can swing downward to close the corresponding outlet, and the other end swings upward to open the other outlet.

[0018] Furthermore, a return spring is arranged between the fixed iron core and the movable iron core, and when the electromagnetic coil loses power, the return spring can be in a natural state to reset the movable iron core.

[0019] Furthermore, a shaft rod is arranged inside the lower electromagnetic driving member. Its upper end is connected to the movable iron core of the upper electromagnetic driving member, and its lower end is pivotally connected to the rocker arm. Arranging the shaft rod inside the lower electromagnetic driving member can save the installation space of the shaft rod, which is further beneficial to the compactness of the overall structure. And through the shaft rod, the movement of the movable iron core of the upper electromagnetic driving member can be transmitted to the rocker arm, and at the same time, the swing center of the rocker arm is limited.

[0020] Furthermore, the movable iron core of the lower electromagnetic driving member abuts against the rocker arm through a push rod to facilitate driving the rocker arm to swing.

[0021] Furthermore, the elastic driving part is located inside the valve seat and includes a driving spring and a tray. The tray abuts against the rocker arm, and a driving spring is provided at its upper end. The driving spring is arranged in the vertical direction, and its two ends respectively abut against the housing and the tray.

[0022] Furthermore, the rocker arm includes a rocker arm body, and a connecting arm is provided in the middle of the upper end of the rocker arm body. The connecting arm is pivotally connected to the shaft rod through a pin shaft.

[0023] Furthermore, a diaphragm covers the lower end surface of the rocker arm body. Both ends of the diaphragm are fixedly embedded in the valve seat, and when the rocker arm body swings, the diaphragm can block any outlet. The sealing performance of the outlet can be improved through the arrangement of the diaphragm.

[0024] Furthermore, abutting convex parts for the elastic driving part and the lower electromagnetic driving part to abut against are respectively provided at the upper end of the rocker arm body, and the abutting convex parts are in an arc-shaped structure. Setting the abutting convex parts in an arc-shaped structure enables an arc surface abutment to be formed between the abutting convex parts and the elastic driving part or the lower electromagnetic driving part when the rocker arm body swings, so as to reduce rigid friction damage.

[0025] Furthermore, the valve seat includes an upper valve seat and a lower valve seat fixedly connected. An inlet and an outlet are provided in the lower valve seat, and a valve cavity communicating with both the inlet and the outlet is provided in the upper valve seat; the rocker arm, the outlet seal, and the elastic driving part are all located in the valve cavity. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the four-way three-way valve according to an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of the four-way three-way valve according to an embodiment of the present invention when the inlet is closed;

[0028] Figure 3 is a schematic structural diagram of the four-way three-way valve according to an embodiment of the present invention when one outlet is closed;

[0029] Figure 4 is a schematic structural diagram of the four-way three-way valve according to an embodiment of the present invention when the other outlet is closed.

[0030] In the figure:

[0031] 1 - valve seat; 11 - inlet; 12 - outlet; 13 - upper valve body; 14 - lower valve body;

[0032] 21 - rocker arm; 211 - connecting arm; 212 - abutting convex part; 213 - diaphragm; 22 - direct-acting valve; 221 - valve rod; 222 - inlet plugging member; 23 - shaft rod;

[0033] 31 - Housing; 32 - Electromagnetic coil; 33 - Fixed iron core; 34 - Movable iron core; 35 - Return spring; 36 - Ring-shaped iron core; 37 - Partition plate; 38 - Push rod;

[0034] 41 - Driving spring; 42 - Tray. Detailed implementation mode

[0035] The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0036] Embodiment

[0037] See the attached Figures 1-4 As shown, a four-way three-way solenoid valve of the present invention includes a valve seat 1, a driving assembly, and an opening and closing assembly. Among them, the valve seat 1 is provided with an inlet 11 and two outlets 12, and the two outlets 12 are located on both sides of the inlet 11. The driving assembly includes a cooperatively used electromagnetic driving part and an elastic driving part. The electromagnetic driving part includes two independently operating upper electromagnetic driving parts and lower electromagnetic driving parts, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite. The opening and closing assembly includes a rocker arm 21 and a direct-acting valve 22. The middle of the rocker arm 21 is pivotally connected to the upper electromagnetic driving part through a shaft rod 23. One end of it can open and close one outlet 12 under the action of the lower electromagnetic driving part, and the other end can open and close the other outlet 12 under the action of the elastic driving part; the direct-acting valve 22 is fixedly connected to the middle of the rocker arm 21, and it can open and close the inlet 11 under the action of the upper electromagnetic driving part. When both electromagnetic driving parts are operating, the elastic driving part is in a compressed state, and the inlet 11 and the two outlets 12 are both in an open state.

[0038] Integrating the direct-acting valve 22 on the rocker arm 21 and realizing the four-way three-way function through the cooperative driving of the upper electromagnetic driving part, the lower electromagnetic driving part and the elastic driving part effectively avoids the cumbersome operation of assembling two two-way valves, and the overall structure is more compact, which can save installation space.

[0039] Specifically, see the attached Figure 1As shown in the figure, the electromagnetic driving part includes a housing 31 fixedly connected to the valve seat 1. Inside the housing 31, an upper electromagnetic driving member and a lower electromagnetic driving member are symmetrically arranged in the vertical direction. Both the upper electromagnetic driving member and the lower electromagnetic driving member include an electromagnetic coil 32, a fixed iron core 33, a movable iron core 34, and a return spring 35. Among them, the fixed iron core 33 is fixedly connected inside the housing 31. The electromagnetic coil 32 is wound around the outside of the movable iron core 34 and can drive the movable iron core 34 to move in the direction close to the fixed iron core 33. The return spring 35 is arranged between the fixed iron core 33 and the movable iron core 34. When the electromagnetic coil 32 is energized, the movable iron core 34 can move in the direction close to the fixed iron core 33, and the return spring 35 is in a compressed state. When the electromagnetic coil 32 is de-energized, the movable iron core 34 is reset under the action of the return spring 35. In this embodiment, the electromagnetic coil 32 of the upper electromagnetic driving member applies an upward driving force to the movable iron core 34, and the electromagnetic coil 32 of the lower electromagnetic driving member applies a downward driving force to the movable iron core 34, so that when both electromagnetic coils 32 are energized, the two movable iron cores 34 move in the direction away from each other.

[0040] It should be noted that when the electromagnetic coil 32 of the upper electromagnetic driving member or the lower electromagnetic driving member is energized, both of the two movable iron cores 34 can be subjected to the electromagnetic driving force of the same electromagnetic coil 32. However, due to their different distances from the electromagnetic coil 32, the driving forces of the two movable iron cores 34 received by the same electromagnetic coil 32 are different. That is, the electromagnetic driving force of the electromagnetic coil 32 of the upper electromagnetic driving member on the movable iron core 34 of the upper electromagnetic driving member is greater than its electromagnetic driving force on the movable iron core 34 of the lower electromagnetic driving member; the electromagnetic driving force of the electromagnetic coil 32 of the lower electromagnetic driving member on the movable iron core 34 of the lower electromagnetic driving member is greater than its electromagnetic driving force on the movable iron core 34 of the upper electromagnetic driving member.

[0041] See the appendix Figure 1 As shown in the figure, when the electromagnetic coils 32 of the upper electromagnetic driving member and the lower electromagnetic driving member are both energized, the two movable iron cores 34 can move in the direction away from each other. That is, the movable iron core 34 of the upper electromagnetic driving member moves upward and applies an upward driving force to the rocker arm 21 through the shaft rod 23. The movable iron core 34 of the lower electromagnetic driving member moves downward and applies a downward driving force to one end of the rocker arm 21, while the spring driving part applies a downward restoring force to the other end of the rocker arm 21. At this time, the rocker arm 21 is balanced under the action of the upper electromagnetic driving member, the lower electromagnetic driving member and the spring driving part, and both outlets 12 are in an open state, and the direct-acting valve 22 stays at the position where the inlet 11 is in an open state. Assume that the rocker arm 21 is at the first height at this time;

[0042] See the appendix Figure 2As shown, when only the electromagnetic coil 32 of the upper electromagnetic driving member is energized, both movable iron cores 34 are subjected to an upward driving force. At this time, since the upward driving force on the rocker arm 21 is greater than the downward restoring force applied by the spring driving portion, the rocker arm 21 can move upward above the first height, so that the direct-acting valve 22 can move to a position where the inlet 11 is in a closed state.

[0043] See the appendix Figure 3 As shown, when only the electromagnetic coil 32 of the lower electromagnetic driving member is energized, both movable iron cores 34 are subjected to a downward driving force. At this time, the rocker arm 21 can move downward below the first height, and the direct-acting valve 22 moves downward to a position where the inlet 11 is in an open state; also, since the driving force on the movable iron core 34 of the lower electromagnetic driving member is greater than the driving force on the movable iron core 34 of the upper electromagnetic driving member, at this time, one end of the rocker arm 21 connected to the lower electromagnetic driving member can swing downward to close the corresponding outlet 12, and the other end swings upward to open the other outlet 12.

[0044] See the appendix Figure 4 As shown, when the electromagnetic coils 32 of both the upper electromagnetic driving member and the lower electromagnetic driving member are not energized, the rocker arm 21 is only subjected to the restoring force of the spring driving portion. At this time, the inlet 11 is in an open state, one end of the rocker arm 21 connected to the spring driving portion can swing downward to close the corresponding outlet 12, and the other end swings upward to open the other outlet 12.

[0045] It should be noted that the force applied by the elastic driving portion on the rocker arm 21 should be less than the force applied by any electromagnetic driving member on the rocker arm 21. So that when any electromagnetic driving member operates, it can overcome the driving of the elastic driving portion on the rocker arm 21.

[0046] In one embodiment, an annular iron core 36 is further wound around the side of the movable iron core 34 away from the fixed iron core 33. The annular iron core 36 is fixedly connected in the housing 31 to guide the movement of the movable iron core 34.

[0047] In one embodiment, a partition plate 37 is further provided in the housing 31. The partition plate 37 is located between the two movable iron cores 34 to limit the movement range of the movable iron cores 34.

[0048] In one embodiment, through holes for the shaft rod 23 to pass through are commonly provided on the two movable iron cores 34 and the partition plate 37. The shaft rod 23 passes through the through holes, its upper end is connected to the movable iron core 34 of the upper electromagnetic driving member, and its lower end is pivotally connected to the middle of the rocker arm 21. The limitation of the shaft rod 23 by the through holes enables the shaft rod 23 to move only up and down along the through holes.

[0049] In one embodiment, the valve seat 1 includes an upper valve body 13 and a lower valve body 14 that are fixedly connected. The lower valve body 14 is provided with an inlet 11 and two outlets 12. A valve cavity that communicates with all the inlets 11 and outlets 12 is provided in the upper valve body 13.

[0050] In one embodiment, the rocker arm 21 is located in the valve cavity. It includes a rocker arm body. A connecting arm 211 that can move along a perforation is integrally provided in the middle of the upper end of the rocker arm body, and the connecting arm 211 is pivotally connected to the shaft rod 23 through a pin shaft. Contact convex portions 212 for the elastic driving portion and the lower electromagnetic driving member to abut against are respectively provided at the upper end of the rocker arm body, and the contact convex portions 212 are in an arc-shaped structure. A diaphragm 213 covers the lower end surface of the rocker arm body. Both ends of the diaphragm 213 are fixedly embedded between the upper valve body 13 and the lower valve body 14, and when the rocker arm body swings, the diaphragm 213 can block any one of the outlets 12. The setting of the diaphragm 213 can improve the sealing performance of the outlet 12, and setting the contact convex portions 212 in an arc-shaped structure enables an arc surface contact to be formed between the contact convex portions 212 and the elastic driving portion or the lower electromagnetic driving member when the rocker arm body swings, so as to reduce rigid friction damage.

[0051] In one embodiment, a push rod 38 that extends into the valve cavity is further connected to the movable iron core 34 of the lower electromagnetic driving member, and the push rod 38 abuts against one of the contact convex portions 212 of the rocker arm 21. When the movable iron core 34 moves downward, the push rod 38 can apply a force to the contact convex portion 212 to cause the rocker arm 21 to swing.

[0052] In one embodiment, see the attached Figure 4 As shown, the elastic driving portion is located in the valve cavity. It includes a driving spring 41 and a tray 42. The tray 42 abuts against the other contact convex portion 212 of the rocker arm 21. A driving spring 41 is provided at its upper end. The driving spring 41 is arranged in the vertical direction, and its two ends respectively abut against the housing 31 and the tray 42.

[0053] In one embodiment, see the attached Figure 2 As shown, the direct-acting valve 22 includes a valve stem 221 fixedly connected to the rocker arm 21. The valve stem 221 is arranged at the inlet 11, and an inlet blocking member 222 is connected thereto to improve the sealing effect of the inlet 11.

[0054] The working process of this embodiment is as follows:

[0055] See the attached Figure 1As shown, when both electromagnetic coils 32 are energized, the two movable iron cores 34 move away from each other, driving the shaft rod 23 and the push rod 38 to move away from each other. At this time, the rocker arm 21 is simultaneously subjected to the forces of the two electromagnetic driving members and the elastic driving portion (the middle of the rocker arm 21 is subjected to an upward force from the shaft rod 23, one end is subjected to a downward force from the push rod 38, and the other end is subjected to the force of the elastic driving portion). Until the upward force and the downward force on the rocker arm 21 cancel each other out, the rocker arm 21 is in a balanced state within the valve cavity. At this time, the inlet 11 and the two outlets 12 are both in the open state, and the rocker arm 21 is at the first height;

[0056] See the appendix Figure 2 As shown, when the electromagnetic coil 32 of the upper electromagnetic driving member is energized and the electromagnetic coil 32 of the lower electromagnetic driving member is not energized, the two movable iron cores 34 move upward simultaneously, driving the shaft rod 23 and the push rod 38 to move upward; at this time, the rocker arm 21 is driven by the shaft rod 23 to move upward (and because the upward force on the shaft rod 23 is greater than the upward force on the push rod 38, when the rocker arm 21 moves upward driven by the shaft rod 23, one end of the rocker arm 21 can always abut against the push rod 38), and the direct-acting valve 22 moves upward until the inlet seal 222 blocks the inlet 11, and the direct-acting valve 22 abuts against the valve seat 1. At this time, the inlet 11 is in the closed state, the two outlets 12 are in the open state, the rocker arm 21 can be located above the first height, and the direct-acting valve 22 is at the highest position of movement;

[0057] See the appendix Figure 3 As shown, when the electromagnetic coil 32 of the lower electromagnetic driving member is energized and the electromagnetic coil 32 of the upper electromagnetic driving member is not energized, the two movable iron cores 34 move downward simultaneously, driving the shaft rod 23 and the push rod 38 to move downward. At this time, the rocker arm 21 moves downward, and because the downward force on the push rod 38 is greater than the downward force on the shaft rod 23, the end of the rocker arm 21 that abuts against the push rod 38 can swing downward, so that the diaphragm 213 can block the corresponding outlet 12, and the other outlet 12 is in the open state. And at this time, the rocker arm 21 is located below the first height, and the direct-acting valve 22 is at the lowest position of movement to ensure that the inlet 11 is in the open state.

[0058] See the appendix Figure 4 As shown, when both electromagnetic coils 32 are not energized, the rocker arm 21 is only subjected to the downward force applied by the elastic driving portion. At this time, the end of the rocker arm 21 that abuts against the tray 42 can swing downward, so that the diaphragm 213 can block the corresponding outlet 12, and the other outlet 12 is in the open state. And at this time, the inlet 11 is also in the open state.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it. It is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A four-way three-position solenoid valve, characterized in that: including a valve seat, which is provided with an inlet and two outlets, and the two outlets are located on both sides of the inlet; a driving assembly, including an electromagnetic driving part and an elastic driving part used in cooperation, the electromagnetic driving part includes two independently operating upper electromagnetic driving parts and lower electromagnetic driving parts, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite; a closing and opening assembly, including a rocker arm and a direct-acting valve, the middle part of the rocker arm is pivotally connected to the upper electromagnetic driving part through a shaft rod, one end of which can open and close one of the outlets under the action of the lower electromagnetic driving part, and the other end can open and close the other outlet under the action of the elastic driving part; the direct-acting valve is fixedly connected to the middle part of the rocker arm and can open and close the inlet under the action of the upper electromagnetic driving part; When both of the two electromagnetic driving parts are operating, the elastic driving part is in a compressed state, and the inlet and the two outlets are both in an open state.

2. The four-way three-position solenoid valve according to claim 1, wherein: The electromagnetic driving part includes a housing fixedly connected to the valve seat, and the upper electromagnetic driving part and the lower electromagnetic driving part which are symmetrically arranged along the vertical direction are arranged in the housing. The upper electromagnetic driving part and the lower electromagnetic driving part both include an electromagnetic coil, a fixed iron core, a movable iron core and a return spring. The movable iron core can move towards the direction close to the fixed iron core under the action of the electromagnetic coil; when both of the two electromagnetic coils are electrified, the two movable iron cores move in the direction away from each other.

3. The four-way three-position solenoid valve according to claim 2, characterized in that: The return spring is arranged between the fixed iron core and the movable iron core, and when the electromagnetic coil is de-energized, the return spring can be in a natural state.

4. The four-way three-position solenoid valve according to claim 2, characterized in that: The shaft rod penetrates through the lower electromagnetic driving part, its upper end is connected to the movable iron core of the upper electromagnetic driving part, and its lower end is pivotally connected to the rocker arm.

5. The four-way three-position solenoid valve according to claim 2, characterized in that: The movable iron core located in the lower electromagnetic driving part abuts against the rocker arm through a push rod.

6. The four-way three-position solenoid valve according to claim 2, wherein: The elastic driving part is located in the valve seat and includes a driving spring and a tray. The tray abuts against the rocker arm, and the driving spring is arranged at its upper end. The driving spring is arranged along the vertical direction, and its two ends respectively abut against the housing and the tray.

7. The four-way three-position solenoid valve according to claim 1, wherein: The rocker arm includes a rocker arm body, and a connecting arm is arranged in the middle of the upper end of the rocker arm body. The connecting arm is pivotally connected to the shaft rod through a pin shaft.

8. The four-way three-position solenoid valve according to claim 7, characterized in that: A diaphragm covers the lower end surface of the rocker arm body. Both ends of the diaphragm are fixedly embedded in the valve seat, and when the rocker arm body swings, the diaphragm can block any one of the outlets.

9. The four-way three-position solenoid valve according to claim 7, characterized in that: The upper end of the rocker arm body is further respectively provided with abutting convex parts for the elastic driving part and the lower electromagnetic driving part to abut against. The abutting convex parts are in an arc-shaped structure.

10. The four-way three-position solenoid valve according to claim 1, characterized in that: The valve seat includes an upper valve seat and a lower valve seat which are fixedly connected. The inlet and the outlet are arranged in the lower valve seat, and a valve cavity communicated with both the inlet and the outlet is arranged in the upper valve seat; the rocker arm, the outlet seal and the elastic driving part are all located in the valve cavity.

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