Motorised valve

Abstract

The utility model provides an electric valve, including valve body assembly and valve rod, and the valve rod includes the limiting portion, and the valve body assembly includes the cooperation portion, the limiting portion includes the first limiting section and the second limiting section, and the cooperation portion includes the first stop surface and the second stop surface, and the cooperation portion is formed with the cooperation cavity, and at least part limiting portion is located in the cooperation cavity, and when the limiting portion rotates relative to the cooperation portion, the first limiting section can abut with the first stop surface, or the second limiting section can abut with the second stop surface, so that by setting the limiting portion on the valve rod and setting the cooperation portion on the valve body assembly, it is favorable to reduce the space occupied by the limiting structure in the electric valve, makes the electric valve compact structure.

Description

Technical Field

[0001] This application relates to an electric valve. Background Technology

[0002] Electric valves in system pipelines generally control the flow of fluid by rotating the valve core. Electric valves typically include a limiting structure to limit the rotation angle range of the valve core. How to design this limiting structure, reduce its space occupation in the electric valve, and make the electric valve structure compact is a technical problem that needs to be improved. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that helps to reduce the space occupied by the limiting structure in the electric valve, making the electric valve structure more compact.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric valve includes a valve body assembly, a valve stem, and a valve core. The valve body assembly has a valve body cavity, the valve core is located in the valve body cavity, the valve stem is throttle-connected to the valve core, and the valve stem is capable of driving the valve core to rotate. The valve stem includes a limiting portion, and the valve body assembly includes a mating portion. The limiting portion includes a first limiting segment and a second limiting segment, and the mating portion includes a first stop surface and a second stop surface. The mating portion forms a mating cavity, at least a portion of the limiting portion is located in the mating cavity, and the limiting portion is rotatable relative to the mating portion. When the limiting portion rotates, the first limiting segment can abut against the first stop surface, or the second limiting segment can abut against the second stop surface.

[0006] This application provides an electric valve, including a valve body assembly and a valve stem. The valve stem includes a limiting portion, and the valve body assembly includes a mating portion. The limiting portion includes a first limiting section and a second limiting section, and the mating portion includes a first stop surface and a second stop surface. The mating portion forms a mating cavity, and at least a portion of the limiting portion is located in the mating cavity. When the limiting portion rotates relative to the mating portion, the first limiting section can abut against the first stop surface, or the second limiting section can abut against the second stop surface. By setting the limiting portion on the valve stem and the mating portion on the valve body assembly, it is beneficial to reduce the space occupied by the limiting structure in the electric valve, making the electric valve structure compact. Attached Figure Description

[0007] Figure 1 This is a schematic cross-sectional view of the electric valve according to the first embodiment;

[0008] Figure 2 This is another cross-sectional structural diagram of the electric valve in the first embodiment;

[0009] Figure 3 yes Figure 1A cross-sectional structural diagram of the central valve component;

[0010] Figure 4 This is an exploded structural diagram of the planetary gear assembly at each stage in the electric valve of the first embodiment;

[0011] Figure 5 yes Figure 1 A cross-sectional structural diagram of the valve body assembly;

[0012] Figure 6 yes Figure 1 A three-dimensional structural diagram of the middle valve stem and the output planetary carrier;

[0013] Figure 7 yes Figure 1 A three-dimensional structural diagram of the valve body;

[0014] Figure 8 This is another cross-sectional structural diagram of the electric valve according to the first embodiment;

[0015] Figure 9 yes Figure 1 A cross-sectional structural diagram of the middle connector;

[0016] Figure 10 yes Figure 1 A three-dimensional structural diagram of the connecting seat. Detailed Implementation

[0017] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0018] See Figure 1 and Figure 2 The electric valve can be applied to vehicle thermal management systems or air conditioning systems. The electric valve 100 includes a control component 1, a valve component 2, a valve body assembly 3, and a valve core 4. The valve body assembly 3 has a valve body cavity 30, and the valve core 4 is located in the valve body cavity 30. The valve core 4 is drivenly connected to the valve component 2. The control component 1 is located on the outer periphery of the valve component 2 and is connected to the valve body assembly 3. The valve component 2 is connected to the valve body assembly 3. The electric valve 100 is electrically connected and / or signal connected to the outside world through the control component 1.

[0019] See Figure 1 and Figure 2In this embodiment, the control component 1 includes a housing 11, a stator assembly 12, a circuit board 13, an interface portion 14, a first pin 15, and a second pin 16. The housing 11 and the interface portion 14 can be integrally injection molded or assembled together. The housing 11 forms a housing cavity 110. The stator assembly 12 and the circuit board 13 are both located within the housing cavity 110. One end of the first pin 15 is electrically connected and / or signal connected to the stator assembly 12, and the other end of the first pin 15 is electrically connected and / or signal connected to the circuit board 13. The second pin 16 is fixedly connected to the interface portion 14. Specifically, in this embodiment, the second pin 16 can be used as an injection molding insert to integrally injection mold the housing 11 and the interface portion 14. One end of the second pin 16 is located in the housing cavity 110 and is electrically connected and / or signal connected to the circuit board 13. The other end of the second pin 16 is located in the insertion cavity 140 formed by the interface portion 14 and is used for electrical and / or signal connection with the outside world. In this embodiment, the control component 1 and the valve body assembly 3 are connected and fixed by screws. Of course, in other embodiments, the control component 1 and the valve body assembly 3 can also be connected and fixed by conventional methods that are easy for those skilled in the art to think of, such as welding, gluing, or snap-fit. Furthermore, a sealing setting can be provided between the control component 1 and the valve body assembly 3, which helps to prevent moisture or other impurities in the outside air from entering the housing cavity 110 through the assembly gap between the control component 1 and the valve body assembly 3 and coming into contact with the stator assembly 12, causing corrosion or failure of the stator assembly 12.

[0020] See Figure 1 and Figure 3 The valve component 2 includes a rotor assembly 21, a transmission mechanism 22, a valve stem 23, a connecting seat 24, and a sleeve 25. The sleeve 25 is located on the outer periphery of the rotor assembly 21 and is fixedly connected to the connecting seat 24. In this embodiment, the sleeve 25 and the connecting seat 24 are fixedly connected by welding. The rotor assembly 21 has a rotor cavity 210, and the connecting seat 24 has a receiving cavity 240. Part of the transmission mechanism 22 is located in the rotor cavity 210, and part of the transmission mechanism 22 is located in the receiving cavity 240. The transmission mechanism 22 is drivenly connected to the valve stem 23, and the valve stem 23 is drivenly connected to the valve core 4. Setting part of the transmission mechanism 22 in the rotor cavity 210 helps to reduce the axial height of the electric valve 100. In this embodiment, the transmission mechanism 22 is a planetary gear mechanism. Of course, in other embodiments, the transmission mechanism 22 is not limited to a planetary gear mechanism.

[0021] See Figure 3 and Figure 4The rotor assembly 21 includes a rotor 211 and a connecting plate 212. The transmission mechanism 22 includes a sun gear 221. The rotor 211 is integrally injection molded with the connecting plate 212 as an injection molding insert. The connecting plate 212 is fixedly connected to the sun gear 221. Of course, in other embodiments, the connecting plate 212 and the sun gear 221 can also be integrally molded. The transmission mechanism 22 also includes a fixed gear ring 222 and at least one stage of planetary gear assembly. The transmission mechanism 22 can be provided with multiple stages of planetary gear assembly according to the needs of the transmission ratio. For example, in this embodiment, along the axial direction of the transmission mechanism 22, the transmission mechanism 22 sequentially includes a first planetary gear assembly 223, a second planetary gear assembly 224, a third planetary gear assembly 225, and an output planetary gear assembly 226. The fixed gear ring 222 is located on the outer periphery of the planetary gear assembly. Part of the positioning ring 222 is located in the rotor cavity 210, and part of the fixed gear ring 222 is located in the receiving cavity 240. The fixed gear ring 222 is fixedly connected to the connecting seat 24. Since the first planetary gear assembly 223, the second planetary gear assembly 224, and the third planetary gear assembly 225 have the same structure, the first planetary gear assembly 223 will be used as an example for explanation. The first planetary gear assembly 223 includes a first planetary gear 2231, a first planetary carrier 2232, and a first spur gear 2233. The first planetary carrier 2232 and the first spur gear 2233 can be integrally formed or assembled and fixed. In this embodiment, the first planetary carrier 2232 and the first spur gear 2233 are integrally injection molded. The first planetary gear assembly 223 also includes a first positioning shaft 2234. The number of the first positioning shaft 2234 and the number of the first planetary gears 2231 are equal. In this embodiment, there are three first positioning shafts 2234 and three first planetary gears 2231. The first positioning shafts 2234 are distributed circumferentially along the outer edge of the first planetary carrier 2232. The first positioning shafts 2234 and the first planetary carrier 2232 can be integrally formed or assembled and fixed. The first planetary gears 2231 are located on the outer periphery of the first positioning shafts 2234. The first planetary gears 2231 are rotatably mounted on the first planetary carrier 2232 through the first positioning shafts 2234. The first planetary gears 2231 mesh with the sun gear 221 and also mesh with the fixed gear ring 222.To prevent the first planetary gear 2231 from moving axially along the first positioning shaft 2234 during rotation, in this embodiment, the valve component 2 further includes a bearing 26 and a gasket 27. The bearing 26 is located on the outer periphery of the sun gear 221 and has an transition fit with the sun gear 221. The gasket 27 is located on the outer periphery of the sun gear 221 and has a clearance fit with the sun gear 221. The sun gear 221 includes a protrusion 2211. Along the axial direction of the sun gear 221, the bearing 26 is located between the protrusion 2211 and the gasket 27. One end of the bearing 26 abuts against the protrusion 2211, and the other end of the bearing 26 abuts against the gasket 27. The gasket 27 abuts against the internal tooth portion 2221 of the fixed gear ring 222. The internal tooth portion 2221 is formed by protruding inward along the radial direction of the fixed gear ring 222. In this way, the first planetary gear 2231 can be axially limited by the gasket 226 and the first planetary carrier 2232. In addition, by setting bearing 26, it is also beneficial to ensure the coaxiality of sun gear 221.

[0022] Similarly, the second planetary gear assembly 224 includes a second planetary gear, a second planetary carrier, a second spur gear, and a second positioning shaft. The second planetary gear is located on the outer periphery of the second positioning shaft. The second planetary gear meshes with the first spur gear and the fixed ring gear. The second planetary gear is axially limited by the first planetary carrier and the second planetary carrier. The third planetary gear assembly 225 includes a third planetary gear, a third planetary carrier, a third spur gear, and a third positioning shaft. The third planetary gear is located on the outer periphery of the third positioning shaft. The third planetary gear meshes with the second spur gear and the fixed ring gear. The third planetary gear is axially limited by the second planetary carrier and the third planetary carrier. The output planetary gear assembly 226 includes a fourth planetary gear, a fourth positioning shaft, and an output planetary carrier 2261. The output planetary carrier 2261 and the valve stem 23 are integrally molded or assembled for transmission. In this embodiment, the valve stem 23 and the output planetary carrier 2261 are integrally injection molded. The planetary gear is located on the outer periphery of the fourth positioning shaft. The fourth planetary gear meshes with the third spur gear and the fixed gear ring gear. The fourth planetary gear is axially limited by the third planetary carrier and the output planetary carrier. It should be noted that the transmission mechanism 22 can be made of plastic or metal. In this embodiment, the transmission mechanism 22 is made of metal. The components of the transmission mechanism 22 can be injection molded using powder metallurgy materials, thus giving the components of the transmission mechanism 22 good wear resistance.

[0023] See Figure 2 and Figure 5The valve body assembly 3 includes a valve body 31, a cover 32, and a valve core seat 33. The valve body 31 and the cover 32 are assembled to form a valve body cavity 30. The valve body 31 includes an opening 311, which forms an oral cavity 312. The oral cavity 312 communicates with the valve body cavity 30. The valve core 4 is located in the valve body cavity 30, and part of the valve component 2 is located in the oral cavity 312. The valve component 2 is drivenly connected to the valve core 4 through the valve stem 23. The valve component 2 is fixedly connected to the valve body 31. Specifically, in this embodiment, the valve component 2 and the valve body 31 are fixedly connected by a clamping nut 5. Of course, in other embodiments, the valve component 2 and the valve body 31 can also be fixed by welding, gluing, or threaded connection. Furthermore, a sealing setting can be provided between the valve component 2 and the valve body 31 to prevent fluid from leaking outward from the assembly gap between the valve component 2 and the valve body 31. The valve core seat 33 is located in the valve body cavity 30 and is disposed on both sides of the valve core 4. The valve core seat 33 includes an arc-shaped surface that mates with the outer surface of the valve core 4. At least a portion of the outer surface of the valve core 4 is fitted to the arc-shaped surface of the valve core seat 33. The valve core 4 can slide with the valve core seat 33, and the valve core seat 33 supports and seals the valve core 4. The valve body 31 has a first channel 311, the cover 32 has a second channel 321, and the valve core 4 has a through-hole 41. By rotating the valve core 4, the through-hole 41 can be connected or disconnected from the first channel 311 and the second channel 321. That is, the electric valve 100 can control the flow of fluid by rotating the valve core 4. It should be noted that in this embodiment, the valve core 4 is spherical or near-spherical. Of course, in other embodiments, the valve core 4 can also be other shapes, such as cylindrical, frustum, etc. In addition, in this embodiment, the electric valve 100 is a two-way valve. Of course, in other embodiments, the electric valve can also be a three-way valve, a four-way valve, or other multi-way valve.

[0024] See Figures 1 to 5The working principle of the electric valve 100 is as follows: After the control component 1 is energized, the stator assembly 12 generates an excitation magnetic field. Under the excitation of the magnetic force, the rotor assembly 21 drives the sun gear 221 to rotate. The sun gear 221 meshes with the first planetary gear 2231, which in turn meshes with the fixed gear ring 222. The fixed gear ring 222 is fixedly set. Thus, while the first planetary gear 2231 rotates, it drives the first planetary carrier 2232 to rotate through the first positioning shaft 2234. The rotation of the first planetary carrier 2232 drives the first spur gear 2233 to rotate. The first spur gear 2233 then meshes with the second planetary gear, which in turn meshes with the fixed gear ring 222. That is, the first spur gear 2233... Under the action of the second planetary gear, the second planetary carrier is driven to rotate through the second positioning shaft. The second planetary carrier drives the second spur gear to rotate. The second spur gear meshes with the third planetary gear, which in turn meshes with the fixed gear ring 222, and so on. Finally, the fourth planetary gear drives the output planetary carrier 2261 to rotate through the fourth positioning shaft. The output planetary carrier 2261 is integrally formed with the valve stem 23. The output planetary carrier 2261 drives the valve stem 23 to rotate. The valve stem 23 is connected to the valve core 4. The rotation of the valve stem 23 drives the rotation of the valve core 4. As the valve core 4 rotates, the channel 41 of the valve core 4 can connect or disconnect the first channel 311 and the second channel 321, thereby realizing the opening and closing of the fluid by the electric valve 100.

[0025] Since the valve core 4 of the electric valve 100 rotates, there are symmetrical position points that achieve the same function. To reduce energy waste, the rotation range of the valve core 4 can be limited. Specifically, see [link to relevant documentation]. Figures 5 to 8The valve stem 23 includes a limiting portion 231. The limiting portion can have various structures, as long as it has a limiting function. The limiting portion 231 includes a non-limiting segment 2311, a first limiting segment 2312, and a second limiting segment 2313. In this embodiment, the non-limiting segment 2311 is an arc-shaped segment, and the cross-section of the limiting portion 231 is approximately fan-shaped. Of course, in other embodiments, the non-limiting segment 2311 can also have other shapes. The first limiting segment 2312 and the second limiting segment 2313 are located on both sides of the non-limiting segment 2311, respectively. The first limiting segment 2312 is connected to the non-limiting segment 2311, and the second limiting segment 2313 is connected to the non-limiting segment 2311. Correspondingly, the opening portion 311 includes a limiting portion. The mating part 313 is provided at the bottom 315 of the opening 311 and forms a mating cavity 314. In terms of the valve body assembly 3, the opening 312 communicates with the valve body cavity 30 through the mating cavity 314. The mating part 313 includes a non-stopping surface 3131, a first stopping surface 3132 and a second stopping surface 3133. In this embodiment, the non-stopping surface 3131 is an arc surface, and the first stopping surface and the second stopping surface are planes. The first stopping surface 3132 is connected to one end of the non-stopping surface 3131, and the second stopping surface 3133 is connected to the other end of the non-stopping surface 3131. The first stopping surface 3132 and the second stopping surface 3133 are not directly connected. At least a portion of the limiting part 231 is located in the mating cavity 314, and the arc length formed by the arc surface is greater than the arc length formed by the arc segment. In this way, the limiting part 231 can rotate relative to the mating part 313. It is defined that when the valve stem 23 drives the valve core 4 to rotate in the clockwise direction, after the valve stem 23 rotates by a certain angle, the first limiting segment 2312 can abut against the first stop surface 3132 to limit the rotation of the valve stem 23. It is defined that when the valve stem 23 drives the valve core 4 to rotate in the counterclockwise direction, after the valve stem 23 rotates by a certain angle, the second limiting segment 2313 can abut against the second stop surface 3133 to limit the rotation of the valve stem 23. It should be noted that clockwise and counterclockwise directions are only used to distinguish the direction of rotation, and are not intended to limit the direction of rotation. Furthermore, the angle between the first limiting segment 2312 and the second limiting segment 2313 facing the arc-shaped segment is defined as the first included angle α, and the angle between the first stop surface 3132 and the second stop surface 3133 facing the arc-shaped surface is defined as the second included angle β. By setting the angles of the first included angle α and the second included angle β, the angle through which the valve stem 23 can drive the valve core 4 to rotate is determined to be β-α. Generally, the angle through which the valve core 4 can rotate with the valve stem 23 can be set between 85° and 125°. In this embodiment, the angle through which the valve core 4 can rotate with the valve stem 23 is 115°. The limiting part 231 is located on the valve stem 23, and the mating part 311 is located at the opening 311 of the valve body. Compared to a separate limiting structure in an electric valve, this reduces the number of limiting structure components and the space occupied by the limiting structure, making the electric valve structure more compact.In addition, setting the non-limiting section of the limiting part to an arc-shaped section and setting the non-stopping surface of the mating part to an arc surface, compared to other shapes for the non-limiting part and non-stopping surface, helps to further reduce the space occupied by the limiting part and the mating part, making the structure more compact.

[0026] See Figure 2 and Figure 9 When the fluid flowing through the electric valve 100 is a high-pressure fluid, the fluid in the valve body cavity 30 acts on the end face of the valve stem 23, which will generate an axial upward pressure on the valve stem 23. If this force is transmitted to the planetary gear assembly, it may increase the squeezing between the planetary gear assemblies at each stage, increase the rotational friction between the planetary gears and the spur gear, increase friction loss, and be detrimental to the service life of the transmission mechanism 22. Therefore, to avoid the above situation, the connecting seat 24 has a receiving portion 241, which forms a receiving cavity 240. The receiving portion 241 includes a first step portion 242 and a second step portion 243. Along the axial direction of the connecting seat 24, the second step portion 243 is located closer to the valve core 4 than the first step portion 242. A portion of the fixed gear ring 222 is located in the receiving cavity 240. The end of the fixed gear ring 222 abuts against the first step portion 242. The fixed gear ring 222 is fixedly connected to the connecting seat 24. In this embodiment, the fixed gear ring 222 and the connecting seat 24 are fixedly connected by riveting. Specifically, the connecting seat 24 also includes a riveting portion 245. The connecting seat 24 is riveted and fixed to the fixed gear ring 222 by the riveting portion 245. Of course, as other embodiments, the fixed gear ring 222 and the connecting seat 24 can also be fixedly connected by interference fit, welding, or adhesive. An integrally formed output planetary carrier 2261 with valve stem 23 is located in the receiving cavity 240. The output planetary carrier 2261 is positioned between the end of the fixed gear ring 222 and the second step portion 243. The output planetary carrier 2261 can abut against the second step portion 243 and the end of the fixed gear ring 222. The output planetary carrier 2261 is axially limited by the end of the fixed gear ring 222 and the second step portion 243. Thus, when fluid pressure acts on the end face of the valve stem 23, the pressure is transmitted to the output planetary carrier 2261 through the valve stem 23. The output planetary carrier 2261 is under pressure... Under the action of force, it abuts against the end of the fixed gear ring 222, which is fixedly set. Thus, the pressure generated by the high-pressure fluid is transmitted to the fixed gear ring 222 through the output planetary carrier 2261. Because the fixed gear ring 222 is fixedly set, force balance is achieved, meaning the pressure generated by the high-pressure fluid will not be transmitted to each stage of the planetary gear assembly through the output planetary carrier 2261. This helps avoid squeezing between the planetary gear assemblies due to fluid pressure, reduces frictional loss in the planetary gear assemblies, and improves the service life of the transmission mechanism 22, thereby improving the service life of the electric valve 100. See also... Figure 2 , Figure 7 as well as Figure 10In this embodiment, the valve body assembly 3 further includes a limiting post 34. The number of limiting posts 34 is at least one, and in this embodiment, the number of limiting posts 34 is two. The limiting posts 34 are disposed at the bottom 315 of the opening 311. The limiting posts 34 are located on both sides of the mating part 313. Along the axial direction of the opening 311, the limiting posts 34 protrude from the bottom 315. The limiting posts 34 can be integrally formed with the bottom 315 or assembled and fixed. Correspondingly, the connecting seat 24 also includes a groove 244 that mates with the limiting post 34. Along the axial direction of the connecting seat 24, the groove 244 is recessed inward from the end face of the connecting seat 24. When at least part of the connecting seat 24 is located in the opening 312, at least part of the limiting post 34 is located in the groove cavity formed by the groove 244. This helps the valve component 2 to be better positioned and facilitates better fixation of the connecting seat 24 and the fixed gear ring 222.

[0027] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. An electric valve, comprising a valve body assembly, a valve stem, and a valve core, wherein the valve body assembly has a valve body cavity, the valve core is located in the valve body cavity, the valve stem is throttlely connected to the valve core, and the valve stem is capable of driving the valve core to rotate, characterized in that: The valve stem includes a limiting portion, the valve body assembly includes a mating portion, the limiting portion includes a first limiting segment and a second limiting segment, the mating portion includes a first stop surface and a second stop surface, the mating portion forms a mating cavity, at least a portion of the limiting portion is located in the mating cavity, the limiting portion is rotatable relative to the mating portion, when the limiting portion rotates, the first limiting segment can abut against the first stop surface, or the second limiting segment can abut against the second stop surface; The electric valve further includes a transmission mechanism, which is a planetary gear mechanism. The transmission mechanism includes an output planetary carrier, which is integrally formed or assembled and fixed with the valve stem. The electric valve also includes a connecting seat, which includes a second stepped portion. The transmission mechanism also includes a fixed gear ring, which is fixedly connected to the connecting seat. Along the axial direction of the output planetary carrier, the output planetary carrier is located between the fixed gear ring and the second stepped portion, and the output planetary carrier is axially limited by the fixed gear ring and the second stepped portion.

2. The electric valve according to claim 1, characterized in that: The limiting part also includes a non-limiting segment, which is an arc-shaped segment. The first limiting segment and the second limiting segment are located on both sides of the non-limiting segment. The first limiting segment is connected to the non-limiting segment, and the second limiting segment is connected to the non-limiting segment. The cross-section of the limiting part has a fan-shaped structure.

3. The electric valve according to claim 2, characterized in that: The mating part also includes a non-stopping surface, which is an arc surface. The first stopping surface and the second stopping surface are planes. The first stopping surface is connected to one end of the non-stopping surface, and the second stopping surface is connected to the other end of the non-stopping surface. The first stopping surface and the second stopping surface are not directly connected. The arc length formed by the arc surface is greater than the arc length formed by the arc segment.

4. The electric valve according to claim 3, characterized in that: The first limiting segment and the second limiting segment form a first included angle (α), and the first stop surface and the second stop surface form a second included angle (β). The valve stem can drive the valve core to rotate through an angle that is the difference between the second included angle (β) and the first included angle (α).

5. The electric valve according to any one of claims 1-4, characterized in that: The electric valve also includes a rotor assembly having a rotor cavity, a portion of which is located.

6. The electric valve according to claim 5, characterized in that: The connecting seat has a receiving cavity, the connecting seat includes a first stepped portion, a second stepped portion is disposed closer to the valve core than the first stepped portion, a portion of the fixed gear ring is located in the receiving cavity, the fixed gear ring abuts against the first stepped portion, and the output planetary carrier is located in the receiving cavity.

7. The electric valve according to claim 6, characterized in that: The electric valve further includes a bearing and a gasket. The transmission mechanism further includes a sun gear, which is fixedly connected to the rotor assembly. The sun gear includes a protrusion. The bearing is located on the outer periphery of the sun gear. The gasket is located on the outer periphery of the sun gear and abuts against the internal teeth of the fixed gear ring. The bearing is located between the protrusion and the gasket, abutting against the protrusion and the gasket.

8. The electric valve according to claim 7, characterized in that: The transmission mechanism further includes a first planetary gear assembly, which includes a first planetary gear, a first planetary carrier, and a first positioning shaft. The first planetary carrier and the first positioning shaft are integrally formed or assembled and fixed. The first planetary gear is located on the outer periphery of the first positioning shaft. The first planetary gear meshes with the sun gear and the fixed gear ring gear. The first planetary gear is located between the washer and the first planetary carrier. The first planetary gear is axially limited by the washer and the first planetary carrier.

9. The electric valve according to any one of claims 6-8, characterized in that: The valve body assembly further includes a limiting post and an opening. The opening forms an oral cavity, which communicates with the valve body cavity through the mating cavity. The opening includes a bottom, the mating part is disposed at the bottom, and the limiting post is disposed at the bottom. The limiting post is located on both sides of the mating part along the axial direction of the opening. The limiting post protrudes from the bottom and is integrally formed or assembled and fixed with the bottom.

10. The electric valve according to claim 9, characterized in that: The connecting seat also includes a groove portion. Along the axial direction of the connecting seat, the groove portion is recessed inward from the end face of the connecting seat. At least a portion of the connecting seat is located in the opening. The connecting seat is fixedly disposed with the opening portion. At least a portion of the limiting post is located in the groove cavity formed by the groove portion.

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