Electric three-way valve

Abstract

The invention discloses an electric three-way valve which comprises a driving device and a valve body, the driving device comprises a stepping motor and a reduction gearbox, the reduction gearbox is provided with an output planet carrier, a ball core is arranged in the valve body, an output shaft of the output planet carrier is connected with the ball core, the valve body is provided with three connectors, the three connectors are a port B, a port C and a port A respectively, the port A is an inlet, and the port B is an outlet. A channel a, a channel b and a channel c are arranged in the ball core, the stepping motor controls the ball core to be in a boundary state when the ball core rotates by 90 degrees through the reduction gearbox so that the ball core can be in the four boundary states of 0 degree, 90 degrees, 180 degrees and 270 degrees, the angle between the two boundary states of the ball core is in a transition state, and the ball core is used for adjusting fluid flow when in the transition state. Continuous flow adjustment can be achieved, the phenomenon of shock cooling and shock heating is avoided, opening and closing of the port B and the port C can be independently controlled, and optimal control over the system is achieved.

Description

Technical Field

[0001] The invention relates to the field of electric valves, and in particular to an electric three-way valve. Background Art

[0002] The existing constant temperature air conditioning valve is mainly composed of a valve body and a temperature control valve head. The on and off of the valve body is controlled by the temperature control valve head, and the flow of the system is controlled by controlling the on and off time.

[0003] Chinese patent publication number CN208967045U discloses a dynamic balanced constant temperature warm air valve, which is mainly composed of a valve body and a temperature control valve head. The temperature control valve head is installed on the valve body, and a valve seat is arranged in the valve body. The valve seat is arranged horizontally and is located between the lower cavity and the upper cavity of the valve body. A valve flap is arranged in the upper cavity, which together with the valve seat forms a valve sealing pair. The valve flap is arranged on the lower end of the valve stem. An adjusting handle for adjustment is arranged on the temperature control valve head. A temperature bag is arranged in the temperature control valve head, and the temperature bag is connected to the upper end of the valve stem. A dynamic adjustment core whose resistance increases with the increase of pressure difference is arranged in the lower cavity. The dynamic adjustment core is provided with a core inlet and a core outlet. The core inlet is connected to the lower cavity and / or the inlet cavity outside it, and the core outlet is connected to the central through hole of the valve seat. The utility model can automatically adjust the medium flow according to the ambient temperature, and can also keep the flow stable when the pressure difference between the inlet and outlet changes.

[0004] However, the above valves can easily cause the room temperature to suddenly change from cold to hot by controlling the flow rate through on-off, which reduces the room experience. In view of the above problems, a solution is proposed below. Summary of the invention

[0005] The object of the present invention is to provide an electric three-way valve, which has the advantages of being able to achieve continuous flow regulation and avoiding sudden cooling and heating.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: An electric three-way valve comprises a driving device and a valve body, wherein the driving device comprises a stepping motor and a reduction box, wherein the stepping motor is connected to the reduction box, wherein the reduction box is provided with an output planetary carrier, wherein a ball core is arranged in the valve body, wherein an output shaft of the output planetary carrier is connected with the ball core to drive the ball core to rotate, wherein three connecting pipes are arranged on the valve body, wherein the three connecting pipes are respectively a port B, a port C and a port A, wherein the port A is an inlet, and the ports B and C are outlets, wherein a channel a, a channel b and a channel c are arranged in the ball core, wherein the ends of the channels b and c are connected and are on the same straight line, wherein a straight channel formed by the channels b and c passes through the ball core, and the straight channel passes through the center of the ball core, wherein the channel a is perpendicular to the channels b and c, and is connected to the intersection of the channels b and c, wherein the stepping motor controls the ball core through the reduction box so that each rotation of the ball core by 90° is one state, so that the ball core has four states of 0°, 90°, 180° and 270°.

[0007] Preferably, in the 0° state, the ball core blocks port A, channel a abuts against the inner wall of the valve body, channel b connects to port C, and channel c connects to port B, so that port B and port C are connected, port A is blocked, and at this time, the fluid outflow state is that both port B and port C are closed; In the 90° state, the ball core blocks the B port, the C channel abuts against the inner wall of the valve body, the A channel connects to the C port, and the B channel connects to the A port, so that the A port and the C port are connected, and the B port is blocked. At this time, the fluid outflow state is that the C port is open; In the 180° state, the ball core blocks the inner wall direction of the valve body, channel a connects to port A, channel b connects to port B, and channel c connects to port C, so that ports A, B, and C are all connected. At this time, the fluid outflow state is that ports B and C are both open; In the 270° state, the ball core blocks the C port, the b channel abuts against the inner wall of the valve body, the a channel connects to the B port, and the c channel connects to the A port, so that the A port and the B port are connected, and the C port is blocked. At this time, the fluid outflow state is that the B port is open. The ball core can adjust the flow rate of the B port and the C port during the rotation of 0° to 90°, 90° to 180° and 180° to 270°.

[0008] Preferably, four interface seats are arranged on the valve body, and the four interface seats are respectively located in the front, back, left and right directions of the valve body, and the four interface seats are interface seat one, interface seat two, interface seat three and interface seat four respectively. Through holes are provided on interface seat one, interface seat two and interface seat three, the A port is connected to interface seat one, the B port is connected to interface seat two, the C port is connected to interface seat three, and there is no through hole on interface seat four, and the interface seat four is fixedly connected to the rear side of the valve body so that the rear side of the valve body cannot communicate with the outside.

[0009] Preferably, a sealing element is provided in each of the four interface seats, and the sealing element is a sealing ring. A sealing groove is provided on the inner side of the interface seat, and the sealing ring is embedded in the sealing groove. The outer edge of the sealing ring is in contact with the inner wall of the sealing groove, and the inner diameter of the sealing groove is the same as the inner diameter of the interface seat. The inner side surface of the sealing ring away from one end of the interface seat is a sealing pair, and the sealing pair is in contact with the outer wall of the ball core, and the sealing pair is a concave arc surface or a slope.

[0010] Preferably, an auxiliary groove is further provided in the interface seat, the auxiliary groove is communicated with the sealing groove, and the width of the auxiliary groove is smaller than the width of the sealing groove. An elastic member is provided in the auxiliary groove, and the elastic member is an elastic ring with a circular cross-section. The cross-sectional diameter of the elastic ring is larger than the depth of the auxiliary groove. One side of the elastic ring is in contact with the deepest part of the auxiliary groove, and the other side of the elastic ring is against the outer end of the sealing ring to push the inner end face of the sealing ring against the ball core.

[0011] Preferably, a stop boss 1 is provided on the base of the reduction gearbox, and a stop boss 2 is provided on the output planetary carrier. The stop boss 1 and the stop boss 2 constitute a stop pair, and the stop boss 1 and the stop boss 2 together form a 90° sector surface. The stop pair is used to limit the output planetary carrier to rotate within the range of 0°~270°.

[0012] Preferably, a pin is provided on the base of the reduction box, a valve seat is fixedly provided on the upper end surface of the valve body, a pit is provided on the top of the valve seat, and the pin is inserted into the pit and is engaged with the pit for positioning.

[0013] Preferably, the output planet carrier is fixed on the valve seat, an annular groove is arranged on the output shaft of the output planet carrier, a sealing ring is arranged in the annular groove, and the sealing ring is used to enhance the sealing between the output shaft of the output planet carrier and the valve seat.

[0014] The beneficial effects of the present invention are: 1. The fluid outlets B and C can be switched independently, and the flow resistance is small when both ports B and C are fully opened, which is particularly suitable for the flow of liquid fluids, such as cold water, hot water, coolant, etc.; 2. When the ball core rotates 0-90°, 90°-180°, and 180°-270°, the flow rate of port B and port C can be adjusted; 3. An elastic element is set between the sealing element and the interface seat to ensure that the sealing element and the ball have pre-tightening force, so that zero leakage sealing can be achieved when the interface is closed, thereby improving the sealing performance; 4. Four sets of sealing elements, interface seats and elastic elements are symmetrically distributed in pairs. The forces on the ball core offset each other, and the combined external force generated by the elastic element is 0, which avoids the phenomenon of uneven force on the ball core and reduces the friction on the output shaft; 5. The reducer base and the output planetary carrier are provided with a stop pair, which makes the stepper motor 0 position positioning accuracy high and improves the repeatability accuracy of the electric three-way valve. At the same time, the reducer base and the valve seat form a convex-concave engagement, which improves the installation positioning accuracy of the reducer base and indirectly guarantees the relative position of the stop pair and the A, B, and C ports, and improves the 0 position accuracy. The convex-concave engagement between the two also provides circumferential positioning torque for fixing the gear ring and the stop pair; 6. By rotating within the range of 0-270 degrees, 4 states can be switched, which can greatly reduce the number of control pulses and shorten the valve response time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment; Figure 2 It is a longitudinal cross-sectional structural diagram of the embodiment in state 1; Figure 3 for Figure 2 Enlarged view of area A in the middle; Figure 4 It is a horizontal cross-sectional structural diagram of the embodiment in state 1; Figure 5 It is a longitudinal cross-sectional structural diagram of the embodiment in state 2; Figure 6 It is a cross-sectional structural diagram in the horizontal direction in the second state of the embodiment; Figure 7 It is a longitudinal cross-sectional structural diagram of the embodiment in state 3; Figure 8 It is a cross-sectional structural diagram in the horizontal direction of the embodiment in state three; Fig. 9 It is a longitudinal cross-sectional structural diagram of the embodiment in state 4; Fig.10 It is a horizontal cross-sectional structural diagram of the embodiment in state 4; Fig.11 It is a cross-sectional structural diagram of the stop pair in the embodiment state.

[0016] Figure numerals: 1. valve body; 2. driving device; 3. stepping motor; 4. reduction gear box; 5. output planetary carrier; 6. ball core; 7. port A; 8. port B; 9. port C; 10. channel a; 11. channel b; 12. channel c; 13. interface seat one; 14. interface seat two; 15. interface seat three; 16. interface seat four; 17. sealing ring; 18. sealing groove; 19. auxiliary groove; 20. elastic ring; 21. stop boss one; 22. stop boss two; 23. pin; 24. valve seat; 25. pit; 26. sealing ring. DETAILED DESCRIPTION

[0017] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0018] like Figures 1 to 11 As shown, an electric three-way valve includes a drive device 2 and a valve body 1. The drive device 2 includes a stepper motor 3 and a reduction box 4. The stepper motor 3 is located at the upper end of the reduction box 4 and is fixedly connected to the reduction box 4. The output shaft of the stepper motor 3 is connected to the input shaft of the reduction box 4. The output shaft of the reduction box 4 is connected to an output planetary carrier 5. The output shaft of the output planetary carrier 5 is connected to the upper end of the ball core 6 located inside the valve body 1. When the stepper motor 3 is started, the output planetary carrier 5 is driven to start through the reduction box 4, so that the output planetary carrier 5 drives the ball core 6 to rotate.

[0019] The upper end surface of the valve body 1 is fixed with a valve seat 24, the reduction box 4 and the output planetary carrier 5 are fixed on the valve seat 24, the base of the reduction box 4 is provided with a pin 23, and the top of the valve seat 24 is provided with a pit 25. The pin 23 is engaged with the pit 25 for positioning, which can prevent the reduction box 4 from making a circular rotation. It can also ensure that the valve core is stably at the 0° position during manufacturing, and also provide positioning torque for fixing the gear ring and the stop boss.

[0020] A riveting portion can also be provided on the valve seat 24, and the valve seat 24 is flanging by a conical riveting head, and the base of the reduction box 4 is riveted to the valve seat 24. The riveting structure provides axial positioning of the valve seat 24 and the base of the reduction box 4, and the pin 23 and the pit 25 realize circumferential positioning.

[0021] The output planet carrier 5 is fixed on the valve seat 24. An annular groove is provided on the output shaft of the output planet carrier 5. A sealing ring 26 is provided in the annular groove. The sealing ring 26 is used to enhance the sealing between the output shaft of the output planet carrier 5 and the valve seat 24 to prevent the fluid in the valve cavity from entering the reduction box 4 and affecting the lubrication of the reduction box 4.

[0022] The core 6 is provided with a channel a 10, a channel b 11 and a channel c 12. The channel b 11 and the channel c 12 are connected to form a straight channel passing through the center of the core 6. The channel a 10 is perpendicular to the channel b 11 and the channel c 12 and is connected to the intersection of the channel b 11 and the channel c 12. The angle between the channel a 10 and the channel b 11 is 90°, the angle between the channel a 10 and the channel c 12 is 90°, and the angle between the channel b 11 and the channel c 12 is 180°.

[0023] The valve body 1 is provided with three interfaces, which are used to connect external pipes. The pipes and interfaces can be connected by plugging, threading or other methods. In the drawings of this embodiment, three pipes are used to represent the three interfaces. The three interfaces are port B 8, port C 9 and port A 7. Port A 7 is located at the front side of the valve body 1, and ports B and C 9 are located at both sides of the valve body 1. Port A 7 is the inlet, and ports B 8 and C 9 are both outlets.

[0024] The stepper motor 3 controls the ball core 6 to rotate 90° through the reduction box 4 to form a boundary state, so that the ball core 6 has four boundary states of 0°, 90°, 180° and 270°. The angle between the two boundary states is the transition state. In the transition state, the opening of each interface is not fully open. By adjusting the angle of the ball core 6, the flow rate of the fluid in the valve body 1 can be regulated.

[0025] A stop boss 21 is provided on the base of the reduction box 4, and a stop boss 2 22 is provided on the output planetary carrier 5. The stop boss 21 and the stop boss 2 22 constitute a stop pair, and the stop boss 21 and the stop boss 2 22 together form a 90° sector surface. The stop pair is used to limit the output planetary carrier 5 to rotate within the range of 0°~270°.

[0026] The following are detailed descriptions of the four states: Boundary state 1: In the 0° state, the ball core 6 blocks the A port 7, the a channel 10 abuts against the inner wall of the valve body 1, the b channel 11 connects to the C port 9, and the c channel 12 connects to the B port 8, so that the B port 8 and the C port 9 are connected, and the A port 7 is blocked. At this time, the fluid outflow state is that the B port 8 and the C port 9 are both closed; Boundary state 2: In the 90° state, the ball core 6 blocks the B port 8, the C channel 12 abuts against the inner wall of the valve body 1, the A channel 10 connects to the C port 9, and the B channel 11 connects to the A port 7, so that the A port 7 and the C port 9 are connected, and the B port 8 is blocked. At this time, the fluid outflow state is that the C port 9 is open; Boundary state three: In the 180° state, the ball core 6 blocks the inner wall direction of the valve body 1, the a channel 10 is connected to the A port 7, the b channel 11 is connected to the B port 8, and the c channel 12 is connected to the C port 9, so that the A port 7, the B port 8 and the C port 9 are all connected. At this time, the fluid outflow state is that the B port 8 and the C port 9 are both open; Boundary state four: in the 270° state, the ball core 6 blocks the C port 9, the b channel 11 abuts against the inner wall of the valve body 1, the a channel 10 connects to the B port 8, and the c channel 12 connects to the A port 7, so that the A port 7 and the B port 8 are connected, and the C port 9 is blocked. At this time, the fluid outflow state is that the B port 8 is open.

[0027] When the ball core 6 is in the process of rotating at 0°-90°, 90°-180° and 180°-270°, that is, in the transition state, the flow rate of the B port 8 and the C port 9 can be adjusted.

[0028] The valve body 1 is provided with four interface seats, which are respectively located in the front, back, left, and right directions of the valve body 1, and the four interface seats are interface seat 1 13, interface seat 2 14, interface seat 3 15, and interface seat 4 16. Through holes are provided on interface seat 1 13, interface seat 2 14, and interface seat 3 15, and one end of port A 7 is plugged into interface seat 1 13, one end of port B 8 is plugged into interface seat 2 14, and one end of port C 9 is plugged into interface seat 3 15. Interface seat 1 13, interface seat 2 14, and interface seat 3 15 can stably fix port A 7, port B 8, and port C 9 on the valve body 1.

[0029] In this design, the rear side of the valve body 1 is in a closed state, and the interface seat 4 16 is used to block the rear side of the valve body 1. The interface seat 4 16 has no through hole and is fixedly connected to the rear side of the valve body 1 so that the rear side of the valve body 1 cannot communicate with the outside.

[0030] The four interface seats are all provided with sealing elements, which can increase the sealing performance between the interface seat and the ball core 6. The sealing element used in this design is a sealing ring 17. For the convenience of description, the outer side of the valve body 1 is designated as the outer end, the direction where the ball core 6 is located is designated as the inner end, the inner side wall of the sealing ring 17 is designated as the inner edge, and the outer side wall of the sealing ring 17 is designated as the outer edge.

[0031] A sealing groove 18 is provided at the inner end of the interface seat, and a sealing ring 17 is embedded in the sealing groove 18, and the outer edge of the sealing ring 17 is in contact with the inner wall of the sealing groove 18. The sealing ring 17 is made of materials such as silicone and rubber. Since it is annular, after installation, the outer wall of the sealing ring 17 will be tightly attached to the sealing groove 18 under the action of its own elastic force. The inner edge diameter of the sealing ring 17 is the same as the inner diameter of the interface seat, so that the fluid can enter the interface seat through the inner hole of the sealing ring 17.

[0032] The inner side surface of the sealing ring 17 away from the interface seat 13 is a sealing pair, which is attached to the outer wall of the ball core 6. The sealing pair is a concave arc surface or an inclined surface. The inclined surface can increase the inner edge diameter of the inner end of the sealing ring 17, which is convenient for increasing the contact area with the ball core 6, thereby enhancing the sealing performance with the ball core 6. The concave structure is provided on the inclined surface, which can further increase the contact area with the ball core 6 and make the ball core 6 produce greater pressure on it, thereby enhancing the sealing performance between the ball core 6 and the sealing ring 17.

[0033] An auxiliary groove 19 is also provided in the interface seat, and the auxiliary groove 19 is communicated with the sealing groove 18, and the width of the auxiliary groove 19 is smaller than the width of the sealing groove 18. An elastic member is provided in the auxiliary groove 19, and the elastic member is an elastic ring 20 with a circular cross section, and the elastic ring 20 is also made of elastic materials such as silicone. The cross-sectional diameter of the elastic ring 20 is greater than the depth of the auxiliary groove 19. When the elastic ring 20 is installed in the auxiliary groove 19, the inner end of the elastic ring 20 will abut against the outer end of the sealing ring 17, and an elastic force will be generated to push the sealing ring 17 inward. The elastic force generated by the elastic ring 20 causes the sealing ring 17 to generate a pre-tightening force with the spherical surface, so that the sealing ring 17 forms a seal with the spherical surface of the steel ball. Since the interface seat is symmetrical in pairs, the ball core 6 is evenly stressed, and the ball core 6 rotates smoothly without generating additional friction resistance, which helps to improve the sealing reliability.

[0034] This design drives the ball core 6 to rotate through the driving device 2 to achieve 4 working states: B port 8 is open, C port 9 is closed; B port 8 is closed, C port 9 is open; B port 8 is closed, C port 9 is closed; C port 9 is open, B port 8 is open. That is, B port 8 and C port 9 are closed independently, and the flow of B port 8 and C port 9 can also be adjusted. By using this electric three-way valve, the flow can be continuously adjusted to avoid sudden cooling and heating, and the opening and closing of B port 8 and C port 9 can also be independently controlled to achieve optimal control of the system.

[0035] The present design controls the rotation direction through the stepper motor 3, and can rotate forward or reversely in the above manner. By adjusting the initial positions of the two stop bosses, the initial rotation direction of the ball core 6 can be changed, making it applicable to a variety of working environments.

[0036] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric three-way valve, comprising a drive device (2) and a valve body (1), wherein the drive device (2) comprises a stepper motor (3) and a reduction box (4), wherein the stepper motor (3) is connected to the reduction box (4), and wherein: The reduction box (4) is provided with an output planetary carrier (5), the valve body (1) is provided with a ball core (6), the output shaft of the output planetary carrier (5) is connected to the ball core (6) to drive the ball core (6) to rotate, the valve body (1) is provided with three interfaces, the three interfaces are respectively a port B (8), a port C (9) and a port A (7), the port A (7) is an inlet, the port B (8) and the port C (9) are outlets, the ball core (6) is provided with an a channel (10), a b channel (11) and a c channel (12), the ends of the b channel (11) and the c channel (12) are connected and are on the same straight line, the b channel ( The linear channel formed by the a channel (11) and the c channel (12) penetrates the ball core (6), and the linear channel passes through the center of the ball core (6); the a channel (10) is perpendicular to the b channel (11) and the c channel (12), and is connected to the intersection of the b channel (11) and the c channel (12); the stepper motor (3) controls the ball core (6) through the reduction box (4) to rotate 90 degrees each time as a boundary state, so that the ball core (6) has four boundary states of 0°, 90°, 180° and 270°; the angle between the two boundary states of the ball core (6) is a transition state, and the ball core (6) is used to adjust the fluid flow when it is in the transition state.

2. An electric three-way valve according to claim 1, characterized in that: In the 0° state, the ball core (6) blocks the A port (7), the a channel (10) abuts against the inner wall of the valve body (1), the b channel (11) is connected to the C port (9), and the c channel (12) is connected to the B port (8), so that the B port (8) and the C port (9) are connected, and the A port (7) is blocked. At this time, the fluid outflow state is that the B port (8) and the C port (9) are both closed; In the 90° state, the ball core (6) blocks the B port (8), the c channel (12) abuts against the inner wall of the valve body (1), the a channel (10) is connected to the C port (9), and the b channel (11) is connected to the A port (7), so that the A port (7) and the C port (9) are connected, and the B port (8) is blocked. At this time, the fluid outflow state is that the C port (9) is open; In the 180° state, the ball core (6) blocks the inner wall direction of the valve body (1), the a channel (10) is connected to the A port (7), the b channel (11) is connected to the B port (8), and the c channel (12) is connected to the C port (9), so that the A port (7), the B port (8) and the C port (9) are all connected. At this time, the fluid outflow state is that the B port (8) and the C port (9) are both open; In the 270° state, the ball core (6) blocks the C port (9), the b channel (11) abuts against the inner wall of the valve body (1), the a channel (10) is connected to the B port (8), and the c channel (12) is connected to the A port (7), so that the A port (7) and the B port (8) are connected, and the C port (9) is blocked. At this time, the fluid outflow state is that the B port (8) is open; The ball core (6) realizes flow regulation of the B port (8) and the C port (9) during the rotation of 0° to 90°, 90° to 180° and 180° to 270°.

3. The electric three-way valve according to claim 1, characterized in that: The valve body (1) is provided with four interface seats, which are respectively located in the front, back, left and right directions of the valve body (1), and the four interface seats are interface seat one (13), interface seat two (14), interface seat three (15) and interface seat four (16). Through holes are provided on interface seat one (13), interface seat two (14) and interface seat three (15), the A port (7) is connected to interface seat one (13), the B port (8) is connected to interface seat two (14), the C port (9) is connected to interface seat three (15), and there is no through hole on interface seat four (16). Interface seat four (16) is fixedly connected to the rear side of the valve body (1) so that the rear side of the valve body (1) cannot communicate with the outside.

4. An electric three-way valve according to claim 3, characterized in that: A sealing element is arranged in each of the four interface seats, the sealing element is a sealing ring (17), a sealing groove (18) is arranged on the inner side of the interface seat, the sealing ring (17) is embedded in the sealing groove (18), the outer edge of the sealing ring (17) is in contact with the inner wall of the sealing groove (18), the inner diameter of the sealing groove (18) is the same as the inner diameter of the interface seat, the inner side surface of the sealing ring (17) away from one end of the interface seat (13) is a sealing pair, the sealing pair is in contact with the outer wall of the ball core (6), and the sealing pair is an inwardly concave arc surface or inclined surface.

5. An electric three-way valve according to claim 4, characterized in that: The interface seat is further provided with an auxiliary groove (19), the auxiliary groove (19) being communicated with the sealing groove (18), and the width of the auxiliary groove (19) being smaller than the width of the sealing groove (18), and an elastic member being provided in the auxiliary groove (19), the elastic member being an elastic ring (20) having a circular cross section, the cross-sectional diameter of the elastic ring (20) being larger than the depth of the auxiliary groove (19), one side of the elastic ring (20) being in contact with the deepest part of the auxiliary groove (19), and the other side of the elastic ring (20) being in contact with the outer end of the sealing ring (17), so as to push the inner end surface of the sealing ring (17) to contact with the ball core (6).

6. The electric three-way valve according to claim 1, characterized in that: A first stop boss (21) is provided on the base of the reduction box (4), and a second stop boss (22) is provided on the output planet carrier (5). The first stop boss (21) and the second stop boss (22) constitute a stop pair. The first stop boss (21) and the second stop boss (22) together form a 90° sector surface. The stop pair is used to limit the output planet carrier (5) to rotate within a range of 0° to 270°.

7. The electric three-way valve according to claim 1, characterized in that: A pin (23) is arranged on the base of the reduction box (4), a valve seat (24) is fixedly arranged on the upper end surface of the valve body (1), a recess (25) is arranged on the top of the valve seat (24), and the pin (23) is inserted into the recess (25) and is locked in position with the recess (25).

8. The electric three-way valve according to claim 1, characterized in that: The output planet carrier (5) is fixed on the valve seat (24), an annular groove is provided on the output shaft of the output planet carrier (5), a sealing ring (26) is provided in the annular groove, and the sealing ring (26) is used to enhance the sealing performance between the output shaft of the output planet carrier (5) and the valve seat (24).

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