Motorized ball valve

Abstract

The utility model provides an electric ball valve, including shaft part, magnetic ring and hall sensor, hall sensor is connected with circuit board electricity and signal connection, shaft part is connected with output shaft, can rotate with output shaft, magnetic ring is set up in the radial outer periphery of shaft part, magnetic ring can rotate with shaft part, this electric ball valve sets up the buffer part in the end of shaft part, is favorable to reduce the axial downward direction of magnetic ring and shaft part in the process of following output shaft rotation and moves about, thereby is favorable to improve the detection precision and stability of detection assembly, improves the control precision of electric ball valve.

Description

Technical Field

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

[0002] An electric ball valve includes a control device, a valve core, and a valve body assembly. The control device includes a drive unit and a transmission component. Specifically, the transmission component can be a planetary gear structure. The drive unit drives the valve core ball of the electric ball valve to move through the transmission component, thereby achieving the purpose of fluid switching or on / off. To improve the control accuracy of the electric ball valve, Hall sensors and magnetic rings are usually installed on the electric ball valve as detection devices. How to install Hall sensors and magnetic rings on the electric ball valve to ensure the control accuracy of the electric ball valve is a technical problem. Summary of the Invention

[0003] The purpose of this invention is to provide an electric ball valve that improves the control accuracy of the electric ball valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An electric ball valve includes a drive unit, a control unit, a transmission component, a valve core ball, and a valve body. The valve core ball is housed within an inner cavity formed by the valve body and has an internal channel. The control unit controls the operation of the drive unit, and the drive unit transmits output torque to the transmission component. The valve body is provided with at least two flow channels for communication with the outside. The transmission component drives the valve core ball to move, and the internal channel of the valve core ball allows the flow channels to be connected or disconnected, or selectively connected or disconnected with one of the flow channels. The electric ball valve is characterized by: the electric ball valve including a magnetic ring and a Hall sensor; the drive unit including a rotor assembly including a shaft; the transmission component including an output shaft connected to the output shaft; the magnetic ring sleeved on the radial outer periphery of the shaft; and the electric ball valve further including a buffer part, the buffer part and the end of the shaft part directly or indirectly abutting against each other.

[0006] The electric ball valve of this technical solution has a buffer section at the end of the shaft, which helps to reduce the axial downward movement of the magnetic ring and the shaft as they rotate with the output shaft. This helps to improve the detection accuracy and stability of the detection component and improve the control accuracy of the electric ball valve. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural diagram of one embodiment of an electric valve;

[0008] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure;

[0009] Figure 3 yes Figure 2 A cross-sectional structural diagram of the central control device;

[0010] Figure 4 yes Figure 2 A cross-sectional structural diagram of the control unit and stator assembly of the central control device;

[0011] Figure 5 yes Figure 4 Exploded view of the central control unit and stator assembly;

[0012] Figure 6 yes Figure 5 A three-dimensional structural diagram of the housing of the central control unit from one angle;

[0013] Figure 7 yes Figure 5 A three-dimensional structural diagram of the housing of the central control unit from another angle;

[0014] Figure 8 yes Figure 5 A three-dimensional structural diagram of the middle stator assembly;

[0015] Figure 9 yes Figure 8 A schematic diagram of the exploded structure of the stator assembly;

[0016] Figure 10 yes Figure 9 A schematic diagram of the exploded structure of the skeleton;

[0017] Figure 11 This is a front view of the stator assembly and circuit board combination.

[0018] Figure 12 yes Figure 11 Schematic diagram of the cross-sectional structure along the AA direction;

[0019] Figure 13 yes Figure 2 Another cross-sectional structural diagram of the rotor assembly and transmission components of the central control device;

[0020] Figure 14 This is a three-dimensional structural diagram of the rotor, connecting bracket, and sun gear at one angle;

[0021] Figure 15 This is a three-dimensional structural diagram of the rotor, connecting bracket, and sun gear from another angle;

[0022] Figure 16 yes Figure 13 A three-dimensional structural diagram of the center-fixed gear;

[0023] Figure 17 yes Figure 13 Exploded view of the first planetary gear assembly;

[0024] Figure 18 yes Figure 17 A three-dimensional structural diagram of the planet carrier of the first planetary gear assembly at one angle;

[0025] Figure 19 yes Figure 13 Exploded view of the planetary gear assembly and output shaft in the mid-output stage;

[0026] Figure 20 yes Figure 19 A three-dimensional structural diagram of the output stage planetary carrier and output shaft of the mid-output stage planetary gear assembly at one angle;

[0027] Figure 21 A partial cross-sectional structural diagram of the second embodiment in which the shaft part cooperates with the buffer part and the limiting part. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0029] See Figure 1-4This is an embodiment of the electric valve of the present invention. The electric valve can be applied to the thermal management system of a vehicle. The electric valve may include an electric ball valve and an electronic expansion valve, etc. In this embodiment, the electric valve is specifically an electric ball valve. The electric ball valve 1 includes a control device 2, a valve core, and a valve body assembly 4. In this embodiment, the valve core is specifically a valve core ball 3. The valve body assembly 4 includes a valve body 41, and the valve core ball 3 is housed in the inner cavity formed by the valve body 41. The control device 2 is fixedly connected to the valve body 41. The control device 2 includes a drive unit, a transmission component 23, and a control unit 24. In this embodiment, the drive unit includes a rotor assembly 21 and a stator assembly 22. Of course, the drive unit can also be of other forms, used to output torque to the transmission unit. The stator assembly 22 is located on the outer periphery of the rotor assembly 21 and has a first receiving cavity 229, in which at least a portion of the rotor assembly 21 is located. The rotor assembly 21 has a transmission component receiving portion 2110, in which at least a portion of the transmission component 23 is located in the transmission component receiving cavity 2110 of the rotor assembly 21. The transmission component 23 includes a valve stem 231, which is connected to the valve core ball 3. The control unit 24 includes a circuit board 241, which is electrically and / or signal-connected to the stator assembly 22. Further, the valve core ball 3 is provided with an inner channel 31, and the valve body 41 is provided with at least two flow channels 411 for communication with the outside. The circuit board 241 controls the stator assembly 22 to generate an excitation magnetic field. Under the action of the excitation magnetic field, the rotor assembly 21 rotates and outputs torque, which is transmitted to the valve stem 231 through the transmission component 23. The valve stem 231 drives the valve core ball 3 to rotate, causing the inner channel 31 of the valve core ball 3 to connect or disconnect from the flow channels 411, or selectively connect or disconnect from one of the flow channels, thereby opening or closing or switching the flow path of the electric ball valve or controlling the flow rate of the flow path.

[0030] See Figure 4 , 8 9, 10. The stator assembly 22 includes a coil winding 221, a stator housing 222, and a frame 220. The frame 220 includes a claw pole plate 223, a first pin 224, and an injection-molded part 225. The frame 220 is integrally injection molded using metal parts such as the claw pole plate 223 and the first pin 224 as injection-molded inserts. The coil winding 221 is located on the outer periphery of the claw pole plate 223 and is wound around the outer periphery of the frame 220. The stator housing 222 is connected to the frame 220, and both the coil winding 221 and the claw pole plate 223 are located inside the stator housing 222. After assembly, the stator assembly becomes a single unit. The first pin 224 is partially encapsulated in the injection molding part 225. One end of the first pin is electrically connected and / or signal connected to the coil winding 221. The other end of the first pin 224 extends out of the injection molding part and can be pressed or soldered to the circuit board 241. In this way, the stator assembly 22 is electrically connected and / or signal connected to the circuit board 241 through the first pin 224.

[0031] Combination Figure 1-7 The control unit 24 also includes a housing 242 and a top cover 243, with the housing 242 and the top cover 243 sealed together. The housing 242 is integrally molded by injection molding and has a control cavity 2421, in which the stator assembly 22 and the circuit board 241 are located. The housing 242 includes a bottom 2422 and a side portion 2423, the side portion 2423 being cylindrical and generally perpendicular to the bottom 2422. The top cover 243 is connected to the side portion 2423. The bottom 2422 has a first through hole 24221, located within the inner circumference of the side portion 2423. The diameter of the first through hole 24221 is larger than the outer diameter of the rotor assembly 21, allowing at least a portion of the rotor assembly 21 to pass through the first through hole 24221. The diameter of the first through hole 24221 is smaller than the outer diameter of the stator assembly 22, which can limit the lower end face of the stator assembly and prevent the stator assembly from disengaging from the control cavity 2421 through the first through hole 24221. The bottom 2422 also has a first connecting hole 24222. The sidewall forming the first connecting hole 24222 may or may not be threaded. The first connecting hole 24222 is located outside the outer periphery of the side portion 2423. The valve body 4 also has a threaded hole corresponding to the first connecting hole 24222. See also... Figure 1The electric ball valve includes a first screw 25, which connects the housing 242 to the valve body 41. To make the connection between the housing 242 and the valve body 41 more uniform and secure, in this embodiment, there are four first connecting holes 24222. Correspondingly, a screw hole is provided around each of the valve body and fixed by the first screw 25. The housing also has positioning ribs 24231, which are located on the inner side wall 24232. The positioning ribs 24231 protrude from the inner side wall 24232 toward the center of the control cavity 2421. The positioning ribs 24231 extend axially from the upper end of the bottom 2422 toward the upper end of the inner side wall 24232. Adjacent positioning ribs are spaced a certain distance apart and are distributed circumferentially along the inner side wall 24232. The lower end face of the stator assembly 22 contacts the bottom 2422. The stator assembly 22 is interference-fitted with the positioning rib 24231. The outer peripheral wall of the stator assembly 22 abuts against the positioning rib 24231, and the positioning rib achieves circumferential positioning of the stator assembly. The side portion 2423 also has several second connecting holes 24233. The side wall forming the second connecting holes 24233 may or may not be threaded. The second connecting holes 24233 are located at the upper end of the inner wall 24232 of the side portion. The second threaded holes 24233 are distributed along the inner periphery of the side portion 2423. Adjacent second connecting holes 24233 are located at the same horizontal height. The second connecting holes 24233 open in the axial direction. The electric ball valve also includes a second screw 26. The upper end of the stator assembly 22 is provided with a connecting hole 228 corresponding to the second connecting hole 24233. The second screw 26 is passed through the connecting hole 228 of the stator assembly 22 and inserted into the second connecting hole 24233, and tightened. The stator assembly 22 and the housing 242 can be connected in the axial direction by the second screw 26. In this embodiment, there are four second screws and four corresponding connecting holes. The four second connecting holes are evenly distributed circumferentially along the inner wall of the side wall, which can better connect the stator assembly and the housing. Of course, the number of second screws and second connecting holes can be appropriately increased or decreased. It is understood that, as other embodiments, the axial connection between the stator assembly 22 and the housing 242 can also adopt other detachable connections, such as snap-fit ​​connections, and is not limited to threaded connections.

[0032] The housing 242 also includes an interface portion 2424, located on the outer periphery of the side portion 2423 and close to the circuit board 241. The interface portion 2424 has a third receiving cavity 24242, which is isolated from and not connected to the control cavity 2421. The control device also includes a second pin 24241, part of which is injection molded to the housing 242. One end of the second pin 24241 is located in the control cavity 2421 and can achieve electrical and / or signal connection with the circuit board 241 by crimping or soldering. The other end of the second pin 24241 is located in the third receiving cavity 24242 and is used for electrical and / or signal connection with the outside world. Thus, the interface portion 2424 enables the circuit board 241 to achieve electrical and / or signal connection with the outside world.

[0033] The side portion 2423 of the housing also has a first stepped portion 24234, which is located on the inner periphery of the side portion, from the attached Figure 4 Viewed from the indicated direction, the first step portion 24234 is located above the injection-molded portion of the stator assembly 22. The first step portion 24234 is closer to the upper cover 243 than the injection-molded portion of the stator assembly 22. The circuit board 241 abuts against the first step portion 24234, which serves to limit and support the circuit board 241. See also Figure 6 The side portion 2423 also includes several third connecting holes 24235, which are also distributed along the inner circumference of the side portion 2423. Adjacent third connecting holes 24235 are located at the same horizontal height. The third connecting holes 24235 open in the axial direction and are closer to the top cover 243 than the second connecting holes 24233. The electric ball valve 1 also includes a third screw 27. The circuit board 241 is provided with a connection hole corresponding to the third connecting hole 24235. The third screw 27 is passed through the connection hole of the circuit board 241 and inserted into the third connecting hole 24235 for tightening. The first pin 224 and the second pin 24241 are crimped or soldered to the circuit board 241. In this embodiment, the ends of the first pin 224 and the second pin 24241 are shaped like fish tails and can be crimped to the circuit board 241 for easy disassembly. The circuit board 241 is connected to the housing 242 by a third screw 27. In this embodiment, there are at least two third screws 27, which prevent the circuit board from rotating in the circumferential direction. Similarly, the connection between the circuit board 241 and the housing 242 can also use other detachable connections, such as snap-fit ​​connections, and is not limited to threaded connections. The stator assembly 22 and the circuit board 241 are detachably connected to the housing 242. Compared with the original secondary injection molding process for the stator assembly and housing, this simplifies the manufacturing process, reduces manufacturing costs, reduces the risk of enameled wire breakage during secondary injection molding, and also reduces maintenance costs. See also Figure 7At the bottom 2422 of the housing, near the valve body, there are two positioning pins 24224. The corresponding valve body 41 is provided with a positioning part. When assembled, the positioning pins and positioning parts are matched to achieve positioning and error prevention functions.

[0034] To enhance the sealing performance of the electric ball valve and reduce the entry of moisture or dust into the cavity containing the circuit board 241 and coil winding 221 (i.e., the control cavity), which could affect the normal operation of the circuit board 241 and stator assembly 22, the control device also includes a first sealing ring 244. The first sealing ring 244 is located between the bottom 2422 of the housing and the stator assembly 22. The bottom 2422 of the housing has a first sealing mounting groove 24223, and the first sealing ring 244 is located in the first sealing mounting groove 24223. The upper end of the first sealing ring 244 is sealed to the lower end face of the stator assembly 22. Through the first sealing ring 244 and the injection-molded portion 225 of the stator assembly 22, moisture is reduced from entering the control cavity through the connection between the housing and the stator assembly.

[0035] In addition, see Figure 8-12 The electric ball valve 1 also includes a third pin 226 and a connector 227. The connector 227 is made of a conductive metal material. Through the connector 227, the stator housing 222 is electrically connected to the third pin 226. The third pin 226 is pressed against the circuit board 241 and electrically connected to the ground layer of the circuit board. The end of the third pin 226 is also fishtail shaped and is connected to the circuit board 241 by pressing, which facilitates disassembly. In this technical solution, conductive connection means that the two can conduct electricity. For mechanical connection, it can be a fixed connection or a detachable connection. The stator housing 222 includes a mating part 2222 and a stator housing body 2221. The mating part 2222 is fixedly connected or integrally connected to the stator housing body 2221 and electrically connected. The mating part 2222 is located on the outer periphery of the stator housing body 2221. One end of the connector 227 abuts against the mating part 2222 and is electrically connected, and the other end of the connector 227 abuts against the third pin 226 and is electrically connected. The third pin 226, like the first pin 224, is an insert molded integrally with the claw plate 223 via injection molding. A portion of the third pin 226 extends beyond the injection-molded portion 225. The stator assembly 22 also has a mounting portion 2251 formed by injection molding, with a portion of the third pin 226 located within the mounting portion 2251. Specifically, this portion of the third pin 226 is located in the middle or upper part of the mounting portion 2251. The connector 227 is inserted from the lower end of the mounting portion 2251 and abuts against the third pin 226. The stator housing 222 is then assembled and fixed. After fixing, the mounting portion 2251 connects with the mating portion, which abuts against the lower end of the connector. The mounting portion 2251 can limit the movement of the connector along the stator housing, limiting the connector in the axial direction through the third pin and the mating portion. Here, movement limitation refers to movement in a certain direction within a certain limit range, as illustrated in the attached embodiment. Figure 12Taking the direction shown as an example, the horizontal movement of the connector is limited by the size of the mounting part, and the movement cannot exceed the range limited by the mounting part. Through the connector 227 and the third pin 226, the stator housing 222 and the circuit board 241 are electrically connected. When there is external electromagnetic interference, the electromagnetic field acting on the surface of the stator housing 222 can be guided from the connector 227 and the third pin 226 to the grounding layer of the circuit board 241, and then connected to the grounding terminal through the grounding layer to achieve grounding, which helps reduce the interference of external electromagnetic fields on the electric ball valve. Specifically, in this embodiment, the connector 227 is a spring. The spring has elasticity, and the third pin and the stator housing are elastically connected by the spring, which plays a buffering role. When the electric ball valve vibrates, it can offset some of the stress, which helps extend the service life of the electric ball valve. In addition, this technical solution reduces welding steps and lowers production costs by connecting the stator housing and the third pin through the connector. Of course, the mating part can also be located on the inner circumference of the stator housing body, or no additional mating part can be provided, achieving the same function by changing the structure of the connector. It is understandable that if the goal is simply to reduce the interference of external electromagnetic fields on the electric ball valve, other components of the stator assembly, such as the frame, claw plates, and coil windings, can be adjusted to some extent. This is not limited to the method given in this embodiment. For example, a secondary injection molding process can be used to integrate the stator assembly and the housing, molding the entire stator assembly and the housing into one piece. After injection molding, the stator housing is still electrically connected to the circuit board through the connector and the third pin.

[0036] See Figure 13 The rotor assembly 21 includes a rotor 211, a connecting bracket 215, and a shaft 216. The rotor 211 is a magnetic rotor containing permanent magnet material. The shaft 216 forms the central shaft of the rotor assembly 21. The connecting bracket 215 is connected to the rotor 211, and the connecting bracket 215 and the shaft 216 are clearance-fitted. The rotor assembly 21 also includes an isolation sleeve and a connecting seat 214. The isolation sleeve includes a sleeve 212 and an end cap 213. The sleeve 212 is located on the radial outer periphery of the rotor 211. One end of the sleeve 212 is fixedly connected to the end cap 213 by welding, and the other end of the sleeve 212 is fixedly connected to the connecting seat 214 by welding. The rotor, connecting bracket, shaft, and at least some transmission components are located within the space formed by the end cap 213, sleeve 212, and connecting seat 214. The rotor assembly is limited and connected to the valve body 41 through the connecting seat 214.

[0037] like Figure 13-15As shown, the connecting bracket 215 includes a connecting portion 2151. The connecting bracket 215 is connected to the rotor 211 as a whole through the connecting portion 2151. Specifically, the rotor 211 and the connecting bracket 215 can be integrally injection molded into a whole, or the rotor 211 and the connecting bracket 215 can be injection molded separately and then fixedly connected into a whole, or the rotor 211 and the connecting bracket 215 can be fixedly connected into a whole. The connecting bracket 215 also includes a first flange portion 2152, which protrudes along the axial direction and is located above the connecting portion 2151. Specifically, the free end of the first flange portion 2152 is disposed near the end cover 213, and the fixed end of the first flange portion 2152 is fixedly connected to the connecting portion 2151 or integrally formed. One end of the shaft portion 216 abuts against the end cover 213. The end of the shaft portion 216 that abuts against the end cover 213 is the first end 2161. The end of the first end 2161 is curved and hemispherical, which can reduce the friction between the shaft portion and the end cover 213 when the shaft portion rotates. The connecting bracket also includes protrusions 2155, which are evenly distributed on the outer periphery of the first flange portion 2152.

[0038] The transmission component 23 includes a reduction mechanism, which is a planetary gear reduction mechanism. However, in other embodiments, the reduction mechanism can be other types of transmission reduction mechanisms. The reduction mechanism includes a sun gear 232 and a planetary gear assembly. The sun gear 232 is fixedly connected to the connecting bracket 215. In this embodiment, see [reference needed]. Figure 14 , 15 The sun gear 232, connecting bracket 215, and rotor 211 are injection molded into a single unit, referred to as the first assembly. The first assembly includes the sun gear 232, connecting bracket 215, and rotor 211. The sun gear 232 is located at the lower end of the connecting bracket 215 and extends axially. The first assembly has a shaft guide portion, which guides and positions the shaft 216. The shaft guide section includes a first guide section 2153 and a second guide section 2321. The first guide section 2153 is located on the connecting bracket 215, and its inner diameter is slightly larger than the outer diameter of the shaft section 216. The second guide section 2321 is located on the sun gear 232 and is coaxially arranged with the first guide section 2153. The inner diameter of the second guide section 2321 is also slightly larger than the outer diameter of the shaft section 216. The second guide section 2321 communicates with the first guide section 2153 of the connecting bracket. A portion of the shaft section 216 is located between the first guide section 2153 and the second guide section 2321, and the shaft section 216 is clearance-fitted with the connecting bracket 215 and the sun gear 232. The transmission component receiving section 2110 is located on the inner circumference of the rotor 211 and at the lower end of the connecting section. The sun gear 232 is located in the transmission component receiving section 2110, and at least a portion of the planetary gear assembly is also located within the transmission component receiving section 2110.

[0039] The reduction mechanism includes at least one planetary gear assembly, which includes an output stage planetary gear assembly. When the required transmission ratio is low, only one output stage planetary gear assembly can be provided. As the required transmission ratio increases, in addition to the output stage planetary gear assembly, there can be one or more sets of planetary gear assemblies. In this embodiment, the reduction mechanism includes three sets of planetary gear assemblies, which are named as follows, from closest to farthest from the sun gear 232: first planetary gear assembly 234, second planetary gear assembly 235, and output stage planetary gear assembly 236. Here, the planetary gear assembly farthest from the sun gear assembly is defined as the output stage planetary gear assembly 236.

[0040] The first planetary gear assembly 234 and the second planetary gear assembly 235 have the same structure. Here, we take the first planetary gear assembly 234 as an example. Figure 17 , 18The first planetary gear assembly 234 includes a planetary gear 2341, a first mounting plate 2342, and a planetary carrier 2343. The planetary carrier 2343 includes a fixed shaft 23431, a spur gear 23432, and a second mounting plate 23433. The fixed shaft 23431 is fixedly connected to one end face of the second mounting plate 23433 or integrally formed. The spur gear 23432 is fixedly connected to the other end face of the second mounting plate 23433 or integrally formed. Specifically, the fixed shaft 23431, the spur gear 23432, and the second mounting plate 23433 can be injection molded to form the planetary carrier 2343, or in other words, the planetary carrier can be integrally formed by injection molding, and the fixed shaft 23431, the spur gear 23432, and the second mounting plate 23433 can be integrally injection molded. The fixed shaft 23431 is arranged approximately perpendicularly to the second mounting plate 23433 and is located at a predetermined distance from the center line of the second mounting plate 23433. The number of fixed shafts 23431 is the same as the number of planetary gears 2341. In this embodiment, there are three planetary gears 2341. The spur gear 23432 is coaxially arranged with the second mounting plate 23433 and is approximately perpendicular to the second mounting plate 23433. The spur gear 23432 has a second through hole 23434, which extends along the axis of the spur gear. Correspondingly, the second mounting plate 23433, which is connected to the spur gear 23432, also has a third through hole 23435. The second through hole 23434 and the third through hole 23435 are basically coaxial, have approximately the same diameter, and are interconnected. Planetary gears 2341 are sleeved on the outer periphery of fixed shaft 23431. The planetary gears 2341 are rotatably mounted between first mounting plate 2342 and second mounting plate 23433 via the fixed shaft. The first mounting plate 2342 has a central through hole 2342a. After the sun gear 232 passes through the central through hole 2342a of the first mounting plate, the sun gear 232 meshes with the inner sides of the three planetary gears 2341. Here, the side of the planetary gear 2341 closest to the central axis of the planetary gear assembly is defined as the inner side, and the opposite side is defined as the outer side. Shaft portion 216 passes through the third through hole 23435 and the second through hole 23434, and is clearance-fitted with the second mounting plate 23433 and the spur gear 23432.

[0041] The first planetary gear assembly 234 may further include a first washer 2344. The first washer 2344 may be one washer or a combination of two or more washers, or it may not be provided. In this embodiment, the first washer 2344 includes an upper washer 2344a and a lower washer 2344b. The upper and lower washers are named according to their relative positions. The upper washer 2344a and the lower washer 2344b are arranged opposite to each other and are located between the second mounting plate 23433 and one end face of the sun gear 232. The second mounting plate 23433 of the planetary carrier has a mounting portion 23436 that is recessed along the direction of the spur gear. The upper washer 2344a and the lower washer 2344b are located in this mounting portion, which can reduce the wear when the second mounting plate rotates. The upper and lower washers are also clearance-fitted with the shaft portion 216. In this embodiment, the upper and lower washers are made of graphite material, but other materials may also be used.

[0042] The output-stage planetary gear assembly 236 includes planetary gears 2361, a first mounting plate 2362, a gasket 2364, and a planet carrier. Except for the planet carrier structure, which differs from that of the first planetary gear assembly 234, the rest of the structure is the same as the first planetary gear assembly. For ease of distinction, the planet carrier of the output-stage planetary gear assembly is referred to as the output-stage planet carrier 2363. For example... Figure 19 , 20 As shown, the output stage planetary carrier 2363 includes a fixed shaft 23631, a third mounting plate 23632, and a connecting portion 23633. The fixed shaft 23631 is arranged substantially perpendicular to the third mounting plate 23632. The fixed shaft 23631 is located on one end face of the third mounting plate 23632 and on a circumference at a predetermined distance from the center line of the third mounting plate 23632. The connecting portion 23633 is located on the other end face of the third mounting plate 23632. The extending direction of the fixed shaft is opposite to the extending direction of the connecting portion. Unlike the planetary carrier 2343 of the first planetary gear assembly, the output stage planetary carrier 2363 does not have a spur gear. The transmission component 23 also includes an output shaft 237, which is connected to or integrally formed with the output stage planetary carrier 2363. Specifically, one end of the output shaft 237 is connected to or integrally formed with the connecting portion 23633.

[0043] The sun gear 232 passes through the central through-hole 2342a of the first mounting plate of the first planetary gear assembly 234 and meshes with the inner sides of the three planetary gears 2341 of the first planetary gear assembly 234. The lower end of the sun gear 232 abuts against the first washer 2344 of the first planetary gear assembly. The spur gear 23432 of the planet carrier of the first planetary gear assembly passes through the central through-hole of the first mounting plate of the second planetary gear assembly 235 and meshes with the inner sides of the three planetary gears of the second planetary gear assembly 235. The lower end of the spur gear 23432 of the first planetary gear assembly abuts against the washer of the second planetary gear assembly. The spur gear of the planet carrier of the second planetary gear assembly 235 passes through the central through-hole of the first mounting plate of the output stage planetary gear assembly 236 and meshes with the inner sides of the three planetary gears of the output stage planetary gear assembly 236. The lower end of the spur gear of the second planetary gear assembly 235 abuts against the washer of the output stage planetary gear assembly.

[0044] The reduction mechanism also includes a fixed gear ring 233, such as Figure 16 As shown, the inner peripheral wall of the fixed gear ring 233 has an internal tooth portion 2331. The first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236 are at least partially built into the fixed gear ring 233. The outer sides of each planetary gear in the first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236 are meshed with the internal tooth portion 2331. The fixed gear ring 233 is at least partially built into the rotor assembly 21, which helps to reduce the space of the control device and facilitates the miniaturization of the control device. The lower end of the fixed gear ring 233 is limitedly connected to the connecting seat 214. The outer diameter of the fixed gear ring 233 is smaller than the inner diameter of the rotor 211. There is a gap between the outer surface of the fixed gear ring 233 and the inner surface of the rotor 211, allowing the rotor 211 to rotate freely relative to the fixed gear ring 233.

[0045] The other end of the output shaft 237 is fixedly connected or limited to the valve stem 231. In this embodiment, the interface of the end of the output shaft 237 near the valve stem 231 is a non-rotating surface, such as a D-shaped interface. The valve stem 231 has a recess that mates with the interface. The output shaft 237 and the valve stem 231 are inserted into each other. The valve stem 231 is connected to the valve core ball 3.

[0046] See also Figure 3 and Figure 13The rotor assembly 21 also includes a magnetic ring 217, and the control unit 24 includes a Hall sensor 245. The Hall sensor detects the rotation angle of the shaft by sensing changes in the magnetic field strength of the magnetic ring. The Hall sensor 245 can be a Hall sensor. The magnetic ring 217 and the Hall sensor 245 serve as a detection component for detecting the rotation angle of the shaft. One end of the shaft 216 abuts against the end cover 213, and the other end of the shaft 216 is sequentially connected to the bracket 215, passes through the sun gear 232, the first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236, and is connected to the output shaft 237. To reduce the rotational friction of the shaft 216, the shaft 216 and the connecting bracket 215, the sun gear 232, the first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236 are all clearance fits. The transmission component has a fourth receiving cavity 238, part of which is located on the output shaft 237 and part of which is located on the valve stem 231. The output shaft 237 has a fourth through hole 2371, which communicates with the fourth receiving cavity 238. One end of the shaft portion 216 away from the end cover 213 can pass through the fourth through hole 2371, and part of the shaft portion is located in the fourth receiving cavity 238. The shaft portion 216 is connected to the output shaft 237 and is driven by the output shaft 237 to rotate circumferentially.

[0047] A magnetic ring 217 is fitted onto the radial outer periphery of the shaft portion 216 and is limited or fixedly connected to the shaft portion 216, allowing the shaft portion to drive the magnetic ring 217 to rotate. The magnetic ring 217 is located inside the connecting bracket 215. The rotor assembly has a magnetic ring receiving portion 2154, which is located inside the first flange portion 2152 of the connecting bracket. The magnetic ring 217 is located in the magnetic ring receiving portion 2154. There is a certain gap between the upper end face of the magnetic ring 217 and the end cover 213, a certain gap between the lower end face of the magnetic ring 217 and the connecting bracket 215, and a certain gap between the outer peripheral surface of the magnetic ring 217 and the inner wall of the first flange portion 2152. The magnetic ring 217 can rotate freely with the shaft portion 216. The material of the magnetic ring can be sintered neodymium iron boron, or other materials such as ferrite. The magnetic ring has at least two different magnetic poles. The Hall sensor 245 is located above the magnetic ring 217 and is electrically and / or signal connected to the circuit board 241. In this embodiment, the Hall sensor 245 is located at one end of the circuit board near the rotor assembly and is fixedly connected to the circuit board 241. To ensure the accuracy of the detection components, the distance between the Hall sensor and the magnetic ring should not be too large. One possible implementation is that the distance between the Hall sensor and the magnetic ring is between 2-4 mm. Since the Hall sensor 245 is set at the end of the circuit board 241 near the rotor assembly, and the magnetic induction surface of the Hall sensor is set close to the rotor assembly, and the circuit board 241 is located above the rotor assembly 21, the magnetic ring 217 is located at the end of the rotor assembly 21 near the circuit board 241. The distance between the Hall sensor and the magnetic ring is relatively close. When the magnetic ring 217 rotates with the shaft 216, the Hall sensor can accurately detect the change in magnetic poles caused by the rotation of the magnetic ring, and then feed it back to the circuit board 241. The circuit board 241 can calculate the angle through which the magnetic ring 217 rotates with the shaft 216. The shaft 216 is driven by the output shaft 237, which also drives the valve stem 231 to rotate. The valve stem 231 drives the valve core ball 3 to rotate. Therefore, the angle of rotation of the valve core ball 3 with the valve stem 231 can be detected, thereby providing feedback on the position of the valve core ball 3 and improving the control accuracy of the electric ball valve. In addition, placing the magnetic ring in the magnetic ring housing of the rotor assembly makes the overall structure of the control device relatively compact and makes reasonable use of space.

[0048] The rotor assembly 21 also includes a buffer portion, which directly or indirectly abuts against the end of the shaft portion. In this embodiment, the buffer portion can be a first spring 2181. The rotor assembly 21 also includes a limiting portion, which in this embodiment indirectly abuts against the end of the shaft portion via a limiting portion. The limiting portion can be a first stop 2182. The first spring 2181 and the first stop 2182 are located in the fourth receiving cavity 238. The first stop 2182 is limited or fixedly connected to the end of the shaft portion 216, which refers to the end of the shaft portion 216 away from the end cover 213. Specifically, the first stop has a recess, and the end of the shaft portion 216 has a protrusion, with the recess and protrusion engaging to limit the movement. One end of the first spring 2181 is located at the bottom of the fourth receiving cavity 238, and the bottom of the fourth receiving cavity 238 is located at the valve stem 231. Therefore, one end of the first spring 2181 abuts against the valve stem, and the other end of the first spring 2181 abuts against the first stop block 2182. The first spring 2181 is compressed by the first stop block and the valve stem whether the electric ball valve is working or not. The first spring 2181 can provide an upward elastic force to the shaft 216, which helps to prevent the shaft from gradually moving away from the end cover during rotation. Through the buffer part and the limiting part, it is beneficial to reduce the axial movement of the magnetic ring and the shaft during rotation, thereby improving the detection accuracy and stability of the detection component and improving the control accuracy of the electric ball valve.

[0049] The rotor assembly 21 also includes a first bearing 2191, a second bearing 2192, and a third bearing 2193. In this embodiment, the first bearing 2191 is a rolling bearing, the second bearing 2192 is a sliding bearing, and the third bearing 2193 is a sliding bearing. The rotor assembly 21 also includes a first bearing mounting portion 2195. In the radial direction, the first bearing mounting portion 2195 is located between the outer wall of the first flange portion 2152 of the connecting bracket and the inner wall of the sleeve 212. In the axial direction, the first bearing mounting portion 2195 is located between the end cover 213 and the connecting bracket 215. The first bearing mounting portion 2195 is located between the lower end face of the end cover 213 and the upper end face of the rotor 211. The first bearing 2191 is located in the first bearing mounting portion 2195, and the first bearing 2191 and the end cover 213 have a certain gap. The outer wall of the first bearing 2191 contacts the inner wall of the sleeve 212, and the inner wall of the first bearing 2191 contacts the outer wall of the first flange 2152. The lower end face of the first bearing 2191 near the inner wall also contacts the connecting bracket 215. Specifically, the lower end face of the inner wall of the first bearing 2191 contacts the protrusion 2155 of the connecting bracket 215, and the first bearing 2191 is interference-fitted with the connecting bracket 215 and the sleeve 212. The first bearing 2191 is interference-fitted with the connecting bracket 215 and the sleeve 212, and the connecting bracket 215 is connected to the rotor 211 and the sun gear 232. The first bearing 2191 is fixed to the sleeve 212. By setting the first bearing 2191, the coaxiality of the rotor, the sleeve, and the sun gear can be improved, the friction of the rotor rotation can be reduced, and the smoothness of the rotor rotation and the transmission efficiency can be improved. Furthermore, this technical solution uses the first bearing 2191 to fix the connecting bracket and the sleeve, so the rotor can be separated from the shaft without being fixed by the shaft, and the sun gear can also be separated from the shaft. This helps to eliminate the stress exerted on the shaft by the rotor and transmission components, improves the service life of the shaft, enhances the stability of the detection component, and improves the transmission efficiency of the transmission components.

[0050] See also Figure 2 and Figure 13The second bearing 2192 is sleeved on the radial outer periphery of the output shaft 237. The second bearing 2192 is located below the output stage planetary carrier 2363. The second bearing 2192 has a second flange portion 2192a, which extends outward in the radial direction. The connecting seat 214 has a second step portion 2141, and the second flange portion 2192a abuts against the second step portion 2141. In addition, the electric ball valve 1 also includes a second gasket 2194, which is sleeved on the radial outer periphery of the output shaft 237. The second gasket 2194 can be a single gasket or a combination of two gaskets similar to the first gasket 2344. The second gasket 2194 is located between the output stage planetary carrier 2363 and the second flange portion 2192a. One end face of the second gasket 2194 can abut against the lower end face of the output stage planetary carrier 2363, and the other end face of the second gasket assembly 2194 can abut against the upper end face of the second flange portion 2192a. The arrangement of the second bearing 2192 and the second gasket 2194 helps to reduce frictional losses during the rotation of the output stage planetary carrier and the output shaft. Of course, the second bearing can also be omitted, and one end face of the second gasket 2194 can abut against the lower end face of the output stage planetary carrier 2363, while the other end face of the second gasket 2194 can directly abut against the second step portion 2141. The end cover 213 has a third bearing mounting part 2131. The third bearing 2193 is located in the third bearing mounting part 2131 and is limitedly connected to the end cover. The third bearing 2193 is sleeved on the radial outer periphery of the shaft part 216. The third bearing 2193 is located near the first end 2161 of the shaft part 216. The third bearing helps to reduce the friction when the shaft part rotates.

[0051] See also Figure 2 and Figure 13 The electric ball valve also includes a clamping nut 42, and the connecting seat 214 is fixedly connected to the valve body 41 by the clamping nut 42. The valve body 41 has a third stepped portion 412, and the connecting seat 214 is at least partially located in the valve body 41. The connecting seat 214 has a third flange portion 2142, which extends radially and abuts against the third stepped portion 412. The clamping nut 42 is sleeved on the radial outer periphery of the main body sidewall of the connecting seat 214, and contacts the upper surface of the third flange portion 2142. The clamping nut 42 is threadedly connected to the valve body 41, thereby fixing the connecting seat 214 to the valve body 41. To enhance the sealing performance of the electric ball valve, the electric ball valve also includes a second sealing ring 43, which is located between the valve body 41 and the connecting seat 214, specifically between the third flange portion 2142 and the third stepped portion 412, which helps to prevent leakage of the working medium.

[0052] The electric ball valve also includes a fourth bearing 44 and a third gasket 45. The fourth bearing 44 is sleeved on the radial outer periphery of the valve stem 231. The valve body 41 has a fourth step portion 413, which is located below the third step portion 412. The fourth bearing 44 is specifically a sliding bearing with a fourth flange portion 441, which abuts against the fourth step portion 413. The third gasket 45 is sleeved on the radial outer periphery of the valve stem 231 and located between the valve stem 231 and the fourth flange portion 441. The third gasket 45 can be a single gasket or a combination of two gaskets similar to the first gasket 2344. Alternatively, the fourth bearing can be omitted, with one end face of the third gasket 45 abutting against the valve stem 231 and the other end face directly abutting against the fourth step portion 413. The connecting seat 214 has a first mounting cavity 2143, with part of the valve stem 231 located in the first mounting cavity 2143. This helps to reduce the axial length of the valve body and facilitates valve body miniaturization. In addition, the first component integrates the connecting bracket, rotor, and sun gear, and forms a magnetic ring housing, a transmission component housing, and a shaft guide. It also cooperates with the sleeve to form a first bearing mounting part. This design can make the most of the space, reduce the size of the electric ball valve, and also help reduce production costs.

[0053] The working process of the electric ball valve 1 is as follows: the circuit board 241 controls the stator assembly 22 to generate an excitation magnetic field. The rotor assembly 21 rotates under the action of the excitation magnetic field. The rotor assembly 21 drives the sun gear 232 to rotate. The sun gear 232 drives the planet gears 2341 of the first planet gear assembly 234 to rotate. While the planet gears 2341 rotate around their fixed axis 23431, they also mesh with the internal teeth 2331 of the fixed gear ring 233, forming a circumferential rotation centered on the sun gear 232. This drives the first mounting plate 2342 and the planet carrier 2343 to rotate. The spur gear 23432 of 2343 drives the planetary gears of the second planetary gear assembly 235 to rotate. Similarly, the power is sequentially transmitted to the output stage planetary carrier 2363 of the output stage planetary gear assembly 236. The output stage planetary carrier 2363 drives the output shaft 237 to rotate, which in turn drives the valve stem 231 to rotate. The valve stem 231 then drives the valve core ball 3 to rotate, causing the valve core ball's channel to connect or disconnect from the flow channel, or selectively connect or disconnect from one of the flow channels, thereby opening, closing, or switching the flow path of the electric ball valve or controlling the flow rate of the flow path. In addition, the output shaft 237 also drives the shaft portion 216 to rotate. The shaft portion 216 is limited or fixed with the magnetic ring 217, so the magnetic ring 217 also rotates with the shaft portion 216. The rotation angle of the shaft portion, i.e., the rotation angle of the valve core ball, can be detected by the Hall sensor 245, improving the control accuracy of the electric ball valve.

[0054] This technical solution also provides a method for manufacturing an electric valve, including the following steps:

[0055] a: Assembly of component one, including the mating assembly of stator assembly 22 and control unit 24.

[0056] The assembly of component one includes the following steps:

[0057] The first sealing ring 244 is placed at the corresponding position of the housing 242, specifically the first sealing mounting groove 24223 mentioned above;

[0058] The assembled stator assembly 22 is pressed into the housing 242 and abuts against the first sealing ring 244. The stator assembly and the housing are then connected as a whole by screws. Specifically, the housing 242 has a second connecting hole 24233, and the stator assembly 22 also has a corresponding connecting hole 228. When pressing the stator assembly 22 into the housing 242, the second connecting hole 24233 must be aligned with the corresponding connecting hole 228 of the stator assembly 22. Then, the second screw 26 is passed through the connecting hole 228 of the stator assembly 22 and inserted into the second connecting hole 24233 to tighten and fix it, thereby realizing the connection between the stator assembly and the housing.

[0059] The circuit board 241 is placed on the first step portion 24234. The circuit board 241 is pressed against the pins (second pin 24241) of the housing 242 and the pins (including the first pin 224 and the third pin 226) of the stator assembly 22. Then, the circuit board 241 is connected to the housing 242 by screws. Specifically, the housing 242 has a third connecting hole 24235, and the circuit board 241 has a connection hole corresponding to the third connecting hole 24235. The third screw 27 is passed through the connection hole of the circuit board 241 and inserted into the third connecting hole 24235 and tightened to realize the connection between the circuit board 241 and the housing 242.

[0060] The top cover 243 is connected to the housing 242 and sealed. This can be achieved through methods such as laser welding.

[0061] The stator assembly includes: integrally injection molding a frame 229 using metal parts (such as the claw plate 223, the first pin 224, and the third pin 226 mentioned above) as inserts; then winding the coil winding 221 around the frame 229; placing the connector 227 in the corresponding position on the frame so that it abuts against the third pin 226; and finally connecting the stator housing 222 to the frame 229 via snap-fit ​​or other means. If the stator assembly does not have the third pin and connector, the assembly process for these two components can be reduced accordingly.

[0062] b: Assembly of component two, including the assembly of rotor assembly 21 and transmission component 23.

[0063] Assembly of component two includes the following steps:

[0064] Assembly of the first pre-assembled component; Assembly of the first pre-assembled component includes: the third bearing 2193 and the end cover 213 are assembled by press fitting, the first bearing 2191 and the sleeve 212 are interference fit, and the end cover 213 and the sleeve 212 are welded and fixed; one end of the assembly of the shaft 216 and the magnetic ring 217 is placed in the third bearing 2193, specifically the first end 2161 of the shaft is placed in the third bearing 2193 and fixed by tooling, and then the rotor 211 and the connecting bracket 215 and the sun gear 232 integrated with the rotor are press-fitted and connected to the first bearing;

[0065] Assembly of the second pre-assembled component; Assembly of the second pre-assembled component includes pressing the second bearing 2192, the fixed gear ring 233 and the connecting seat 214 together;

[0066] Assembling the first pre-assembled component, the second pre-assembled component, and the transmission components may include: placing a second shim 2194 in the second pre-assembled component; assembling the output shaft 237 with the output stage planetary gear assembly 236; assembling the output stage planetary gear assembly 236, the second planetary gear assembly 235, the first planetary gear assembly 234, and the second pre-assembled component; and then assembling the first pre-assembled component and the second pre-assembled component and fixing them by welding, specifically fixing the connection between the sleeve and the connecting seat by welding.

[0067] In the assembly of component two, the assembly of the first pre-assembled part and the assembly of the second pre-assembled part can be carried out simultaneously without any order.

[0068] c: Assembly of component three, including the assembly of component two with valve body assembly 4 and valve core.

[0069] Assembly of component three includes:

[0070] Assemble the second sealing ring 43 with the valve body assembly 4;

[0071] The first stop 2182 and the first spring 2181 are placed in the inner cavity formed by the output shaft. The first stop 2182 wraps around the end of the shaft portion 216 located in the output shaft 237, and one end of the first spring 2181 abuts against the first stop 2182. Alternatively, the first spring 2181 can be placed in the fourth receiving cavity 238 of the valve stem, and the first stop is placed in the inner cavity of the output shaft 237 and wraps around the end of the shaft portion 216.

[0072] The assembly of component two, the first stop block, and the first spring is connected to the valve stem 231 via the output shaft 237. The other end of the first spring 2181 is placed in the fourth receiving cavity 238 inside the valve stem and contacts the second sealing ring 43 via the third flange portion 2142 of the connecting seat. By tightening the clamping nut 42, component two is connected to the valve body assembly 4.

[0073] Assemble the valve stem and valve core, the fourth bearing, the third gasket, and the valve body assembly; including assembling the fourth bearing with the valve body, then placing the third gasket on the end face of the fourth bearing, and then assembling the valve stem with the valve body, wherein the valve stem and valve core are connected by a plug-in connection.

[0074] d: Connection between component one and component three.

[0075] The connection between component one and component three includes pressing component one into component three from above and connecting them as a whole by screws. The rotor assembly 21 is at least partially located on the inner periphery of the stator assembly 22, aligned with the first connecting hole 24222 of the housing 242 and the screw hole and positioning post reserved in the valve body assembly 4, and the component one and component three are connected by screwing in the first screw 25.

[0076] See Figure 21 , Figure 21 This is another embodiment of the present technical solution in which the shaft portion 216 cooperates with the buffer portion and the limiting portion. Figure 13 The main difference in the technical solution shown is that, in this embodiment, the end of the shaft 216 has a recess, and the corresponding limiting part is specifically the second stop 2182'. The second stop 2182' has a protrusion, and the recess and the protrusion cooperate to limit the movement. In this embodiment, the buffer part is the second spring 2181', and the second spring 2181' abuts against the second stop 2182'.

[0077] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described 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 the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electrically operated ball valve, comprising a driving part, a control part, a transmission part, a valve ball and a valve body, the valve ball is contained in an inner cavity formed by the valve body, the valve ball has an inner channel, the control part controls the operation of the driving part, the driving part transmits an output torque to the transmission part, the valve body is provided with at least two flow channels for communicating with the outside, the transmission part drives the valve ball to move, and the flow channels are connected or disconnected or selectively connected or disconnected with one of the flow channels through the inner channel of the valve ball, and the control part comprises a circuit board, characterized in that: The electric ball valve comprises a detection magnetic ring and a position sensor, the position sensor is electrically and signal connected with the circuit board, the driving part comprises a rotor assembly, the rotor assembly comprises a shaft part, the transmission component comprises an output shaft, the shaft part is connected with the output shaft, the shaft part can rotate with the output shaft, the detection magnetic ring is sleeved on the radial outer periphery of the shaft part, the detection magnetic ring can rotate with the shaft part, the electric ball valve further comprises a buffer part, the buffer part and the end part of the shaft part directly or indirectly abut; the electric ball valve further comprises a limiting part, the limiting part is limited with the end part of the shaft part, and the buffer part abuts with the limiting part.

2. The motorized ball valve of claim 1, wherein: The rotor assembly comprises an end cover, a sleeve and a rotor, the sleeve is fixedly connected with the end cover, the rotor is located on the inner periphery of the sleeve, one end of the shaft part is in contact with the end cover, and the limiting part is limited with the end part of the shaft part away from the end cover.

3. The motorized ball valve of claim 2, wherein: The transmission component comprises a valve stem, the output shaft is fixedly connected or limitingly connected with the valve stem, the valve stem is connected with the valve core ball, the transmission component has a fourth accommodating cavity, the fourth accommodating cavity is located between the output shaft and the valve stem, at least part of the limiting part and the buffer part are located in the fourth accommodating cavity, and the buffer part abuts with the valve stem.

4. The motorized ball valve according to any of claims 1 to 3, characterized in that: The circuit board is located above the rotor assembly, the position sensor is located at one end of the circuit board close to the rotor assembly, the sensing surface of the position sensor is arranged close to the rotor assembly, the detection magnetic ring is sleeved on one end of the shaft part close to the rotor assembly, and the position sensor is located above the detection magnetic ring.

5. The motorized ball valve of claim 3, wherein: Part of the fourth accommodating cavity is located in the output shaft, part of the fourth accommodating cavity is located in the valve stem, the output shaft has a fourth through hole, the fourth through hole of the output shaft is in communication with the fourth accommodating cavity, and the end part of the shaft part away from the end cover passes through the fourth through hole and is located in the fourth accommodating cavity.

6. The motorized ball valve according to claim 3 or 5, wherein: The limiting part comprises a first stopper, the first stopper has a recess, the end part of the shaft part away from the end cover has a protrusion, the recess is matched with the protrusion, the buffer part comprises a first spring, one end of the first spring abuts with the first stopper, the other end of the first spring abuts with the valve stem, and the first spring is compressed by the first stopper and the valve stem.

7. The motorized ball valve of claim 3 or 5, wherein: The limiting part comprises a second stopper, the second stopper has a protrusion, the end part of the shaft part away from the end cover has a recess, the recess is matched with the protrusion, the buffer part comprises a second spring, one end of the second spring abuts with the second stopper, the other end of the second spring abuts with the valve stem, and the second spring is compressed by the second stopper and the valve stem.

8. The motorized ball valve according to any of claims 2-3, wherein: The electric ball valve further comprises a third bearing, the third bearing is sleeved on one end of the shaft part in contact with the end cover, and the third bearing is fixedly or limitingly connected with the end cover.

9. The motorized ball valve according to any of claims 1, 2, 3, 5, wherein: The transmission component comprises a sun gear, a planetary gear assembly, and a ring gear, the ring gear is at least partially located in the rotor assembly, the sun gear and the planetary gear assembly are at least partially located in the ring gear, the planetary gear assembly comprises a first mounting plate, a planetary gear, and a carrier, the planetary gear is located between the first mounting plate and the carrier, the inner side of the planetary gear is in meshing connection with the sun gear, the outer side of the planetary gear is in meshing connection with the ring gear, the carrier is connected with the output shaft, the rotor drives the sun gear, the planetary gear, and the carrier to rotate, so as to drive the output shaft to rotate; the shaft part passes through the sun gear, the planetary gear assembly, and is connected with the output shaft, and the shaft part is in clearance fit with the sun gear and the planetary gear assembly.

10. The motorized ball valve of claim 4, wherein: The transmission component comprises a sun gear, a planetary gear assembly, and a ring gear, the ring gear is at least partially located in the rotor assembly, the sun gear and the planetary gear assembly are at least partially located in the ring gear, the planetary gear assembly comprises a first mounting plate, a planetary gear, and a carrier, the planetary gear is located between the first mounting plate and the carrier, the inner side of the planetary gear is in meshing connection with the sun gear, the outer side of the planetary gear is in meshing connection with the ring gear, the carrier is connected with the output shaft, the rotor drives the sun gear, the planetary gear, and the carrier to rotate, so as to drive the output shaft to rotate; the shaft part passes through the sun gear, the planetary gear assembly, and is connected with the output shaft, and the shaft part is in clearance fit with the sun gear and the planetary gear assembly.

11. The motorized ball valve of claim 6, wherein: The transmission component comprises a sun gear, a planetary gear assembly, and a ring gear, the ring gear is at least partially located in the rotor assembly, the sun gear and the planetary gear assembly are at least partially located in the ring gear, the planetary gear assembly comprises a first mounting plate, a planetary gear, and a carrier, the planetary gear is located between the first mounting plate and the carrier, the inner side of the planetary gear is in meshing connection with the sun gear, the outer side of the planetary gear is in meshing connection with the ring gear, the carrier is connected with the output shaft, the rotor drives the sun gear, the planetary gear, and the carrier to rotate, so as to drive the output shaft to rotate; the shaft part passes through the sun gear, the planetary gear assembly, and is connected with the output shaft, and the shaft part is in clearance fit with the sun gear and the planetary gear assembly.

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