CN113833896A - Electric ball valve - Google Patents

Abstract

The utility model provides an electric ball valve, including the axial region, detect magnetic ring and position sensor, position sensor is connected with the circuit board electricity and signal connection, the axial region is connected with the output shaft, can rotate along with the output shaft, the radial periphery of axial region is located to the magnetic ring cover, the magnetic ring can rotate along with the axial region, this electric ball valve sets up the buffering portion at the axial region end, be favorable to reducing the play of magnetic ring and axial region in the axial downward direction of following output shaft pivoted in-process, thereby be favorable to improving the detection precision and the stationarity of detecting element, improve the control accuracy of electric ball valve.

Description

Electric ball valve

Technical Field

The invention relates to an electric ball valve.

Background

The electric ball valve comprises a control device, a valve core and a valve body assembly, wherein the control device comprises a driving part and a transmission part, the specific transmission part can be of a planetary gear structure, the driving part drives a valve core ball of the electric ball valve to act through the transmission part so as to achieve the aim of fluid switching or on-off, in order to improve the control precision of the electric ball valve, a position sensor and a detection magnetic ring are usually arranged on the electric ball valve to serve as a detection device, and how to arrange the position sensor and the detection magnetic ring on the electric ball valve to ensure the control precision of the electric ball valve is a technical problem.

Disclosure of Invention

The invention aims to provide an electric ball valve which is beneficial to improving the control precision of the electric ball valve.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electric ball valve comprises a driving part, a control part, a transmission part, a valve core ball and a valve body, wherein the valve core ball is accommodated in an inner cavity formed by the valve body, the valve core ball is provided with an inner channel, the control part controls the driving part to operate, the driving part transmits output torque to the transmission part, the valve body is provided with at least two circulation channels communicated with the outside, the transmission part drives the valve core ball to move, and the circulation channels are communicated or not communicated or selectively communicated or not communicated with one of the circulation channels through the inner channel of the valve core ball, and the electric ball valve is characterized in that: the electric ball valve comprises a detection magnetic ring and a position sensor, the position sensor is electrically connected with the circuit board and is in signal connection with the circuit board, the driving portion comprises a rotor assembly, the rotor assembly comprises a shaft portion, the transmission component comprises an output shaft, the shaft portion is connected with the output shaft, the shaft portion can rotate along with the output shaft, the detection magnetic ring is sleeved on the radial periphery of the shaft portion, the detection magnetic ring can rotate along with the shaft portion, the electric ball valve further comprises a buffering portion, and the buffering portion is directly or indirectly abutted to the end portion of the shaft portion.

This technical scheme's electric ball valve is favorable to reducing the play that detects magnetic ring and axial part and following output shaft pivoted in-process axial downward direction through the tip at the axial part sets up buffer part to be favorable to improving detection assembly's detection precision and stationarity, improve electric ball valve's control accuracy.

Drawings

Figure 1 is a schematic perspective view of one embodiment of an electrically operated valve;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the control device of FIG. 2;

FIG. 4 is a cross-sectional view of a stator assembly of the control portion of the control device of FIG. 2;

FIG. 5 is an exploded view of the control section and stator assembly of FIG. 4;

FIG. 6 is a schematic view of an angular perspective of the housing of the control section of FIG. 5;

FIG. 7 is a schematic perspective view of another angle of the housing of the control section of FIG. 5;

FIG. 8 is a perspective view of the stator assembly of FIG. 5;

FIG. 9 is an exploded view of the stator assembly of FIG. 8;

FIG. 10 is an exploded schematic view of the skeleton of FIG. 9;

FIG. 11 is a front view schematic of the stator assembly and circuit board combination;

FIG. 12 is a schematic cross-sectional view taken along line A-A of FIG. 11;

FIG. 13 is another cross-sectional structural schematic view of the rotor assembly and drive components of the control device of FIG. 2;

FIG. 14 is a schematic perspective view of an angle of the rotor, connecting bracket and sun gear;

FIG. 15 is a schematic perspective view of another angle of the rotor, connecting bracket and sun gear;

FIG. 16 is a perspective view of the fixed gear of FIG. 13;

FIG. 17 is an exploded schematic view of the first planetary gear assembly of FIG. 13;

FIG. 18 is an angular perspective view of the planet carrier of the first planetary gear assembly of FIG. 17;

FIG. 19 is an exploded schematic view of the output stage planet wheel assembly and output shaft of FIG. 13;

FIG. 20 is a schematic perspective view of one angle of the output stage planet carrier and output shaft of the output stage planetary wheel assembly of FIG. 19;

FIG. 21 is a partial cross-sectional view of the second embodiment showing the shaft portion engaged with the buffer portion and the stopper portion.

Detailed Description

The invention will be further described with reference to the following figures and specific examples:

referring to fig. 1 to 4, in an embodiment of the electric valve according to the present invention, the electric valve may be applied to a thermal management system of a vehicle, and may include an electric ball valve, an electronic expansion valve, and the like. The electric ball valve 1 comprises a control device 2, a valve core and a valve body assembly 4, wherein the valve core is specifically a valve core ball 3 in the embodiment, the valve body assembly 4 comprises a valve body 41, the valve core ball 3 is accommodated in an inner cavity formed by the valve body 41, and the control device 2 is fixedly connected with the valve body 41. The control device 2 includes a driving unit, a transmission member 23, and a control unit 24. In this embodiment, the driving portion includes a rotor assembly 21 and a stator assembly 22, but the driving portion may also be in other forms for outputting torque to the transmission portion; the stator assembly 22 is located at the outer periphery of the rotor assembly 21, the stator assembly 22 having a first housing cavity 229, at least a portion of the rotor assembly 21 being located in the first housing cavity 229. The rotor assembly 21 has a driving part receiving portion 2110, and at least a portion of the driving part 23 is located in the driving part receiving cavity 2110 of the rotor assembly 21. The transmission member 23 includes a stem 231, and the stem 231 is connected to the spool ball 3. The control portion 24 includes a circuit board 241, and the circuit board 241 is electrically and/or signally connected to the stator assembly 22. Further, the spool ball 3 is provided with the inner passage 31, and the valve body 41 is provided with at least two flow passages 411 for communication with the outside. 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 to output torque, the torque is transmitted to the valve rod 231 through the transmission component 23, the valve rod 231 drives the valve core ball 3 to rotate, the inner channel 31 of the valve core ball 3 is communicated or not communicated with the circulation channel 411 or selectively communicated or not communicated with one of the circulation channels, and therefore the circulation path of the electric ball valve is opened or closed or switched or the flow of the circulation path is controlled.

Referring to fig. 4, 8, 9, and 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 molding portion 225, the frame 220 is formed by injection molding of metal parts such as the claw pole plate 223 and the first pin 224 as an injection molding insert, the coil winding 221 is located at the periphery of the claw pole plate 223, the coil winding 221 is wound around the periphery of the frame 220, the stator housing 222 is connected to the frame 220, and the coil winding 221 and the claw pole plate 223 are located inside the stator housing 222. The stator assembly is assembled to form a unitary piece. The first pin 224 is partially encapsulated in the injection molding part 225, one end of the first pin 224 is electrically and/or signal-connected with the coil winding 221, and the other end of the first pin 224 extends out of the injection molding part and can be crimped or welded with the circuit board 241, so that the stator assembly 22 is electrically and/or signal-connected with the circuit board 241 through the first pin 224.

Referring to fig. 1 to 7, the control unit 24 further includes a housing 242 and an upper cover 243, and the housing 242 is hermetically connected to the upper cover 243. The housing 242 is integrally formed by injection molding, the housing 242 has a control cavity 2421, and the stator assembly 22 and the circuit board 241 are located in the control cavity 2421. The housing 242 includes a bottom part 2422 and a side part 2423, the side part 2423 is cylindrical, the side part 2423 is substantially perpendicular to the bottom part 2422, and the upper cover 243 is connected to the side part 2423. The bottom part 2422 has a first through hole 24221, the first through hole 24221 being located inside an inner circumference of the side part 2423, the first through hole 24221 having a diameter larger than an outer diameter of the rotor assembly 21 such that at least a portion of the rotor assembly 21 can 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 surface of the stator assembly and prevent the stator assembly from being separated from the control cavity 2421 from the first through hole 24221. The bottom part 2422 further has a first through hole 24222, a side wall forming the first through hole 24222 may or may not be threaded, the first through hole 24222 is located outside the outer circumference of the side part 2423, and the valve body 4 is also provided with a screw hole corresponding to the first through hole 24222. Referring to fig. 1, the electric ball valve includes first screws 25, the housing 242 can be connected to the valve body 41 by the first screws 25, in order to make the connection between the housing 242 and the valve body 41 more uniform and firm, the number of the first through holes 24222 is 4 in this embodiment, and correspondingly, one screw hole is respectively formed around the valve body and fixed by the first screws 25. The shell is further provided with positioning ribs 24231, the positioning ribs 24231 are positioned on the side inner wall 24232, the positioning ribs 24231 protrude from the side inner wall 24232 towards the center of the control cavity 2421, the positioning ribs 24231 extend from the upper end surface of the bottom part 2422 to the upper end part of the side inner wall 24232 along the axial direction, and adjacent positioning ribs are spaced at a certain distance and distributed along the circumferential direction of the side inner wall 24232. The lower end face of the stator assembly 22 is in contact with the bottom part 2422, the stator assembly 22 is in interference fit with the positioning ribs 24231, the peripheral wall of the stator assembly 22 abuts against the positioning ribs 24231, and circumferential positioning of the stator assembly is achieved through the positioning ribs. The side part 2423 further has a plurality of second communication holes 24233, a side wall forming the second communication holes 24233 may or may not be threaded, the second communication holes 24233 are located at an upper end portion of the side inner wall 24232, the second screw holes 24233 are distributed along an inner circumference of the side part 2423, adjacent second communication holes 24233 are located at the same level, and the second communication holes 24233 are opened in an axial direction. The electric ball valve further includes a second screw 26, the upper end of the stator assembly 22 is provided with a connection hole 228 corresponding to the second communication hole 24233, the second screw 26 passes through the connection hole 228 of the stator assembly 22 and extends into the second communication hole 24233, and the stator assembly 22 and the housing 242 can be connected in the axial direction by the second screw 26. In this embodiment, the number of the second screws is 4, the number of the corresponding connecting holes is also 4, and the 4 second communicating holes are uniformly distributed along the circumferential direction of the inner wall of the side wall, so that the stator assembly and the housing can be connected well, and the number of the second screws and the number of the second communicating holes can be increased or decreased properly. It is understood that, as other embodiments, the stator assembly 22 and the housing 242 may be connected in the axial direction by other detachable connections, such as a snap connection, and not limited to a threaded connection.

The housing 242 further includes an interface part 2424, the interface part 2424 is located at the periphery of the side part 2423, the interface part 2424 is disposed near the circuit board 241, the interface part 2424 has a third accommodating cavity 24242, the third accommodating cavity 24242 is isolated and not communicated with the control cavity 2421, the control device further includes a second pin 24241, a part of the second pin 24241 is fixed to the housing 242 by injection molding, one end of the second pin 24241 is located in the control cavity 2421, and electrical connection and/or signal connection with the circuit board 241 can be achieved by press-fitting or soldering fixation with the circuit board 241. The other end of the second pin 24241 is located in the third accommodating cavity 24242 for electrical connection and/or signal connection with the outside, so that the electrical connection and/or signal connection of the circuit board 241 with the outside can be realized through the interface part 2424.

The side part 2423 of the housing further has a first stepped part 24234, the first stepped part 24234 is located on the inner periphery of the side part, when viewed from the direction shown in fig. 4, the first stepped part 24234 is located above the injection part of the stator assembly 22, the first stepped part 24234 is closer to the upper cover 243 than the injection part of the stator assembly 22, the circuit board 241 abuts against the first stepped part 24234, and the first stepped part 24234 plays a role in limiting and supporting the circuit board 241. Referring to fig. 6, the side part 2423 further includes a plurality of third communication holes 24235, the third communication holes 24235 are also distributed along the inner circumference of the side part 2423, adjacent third communication holes 24235 are located at the same level, the third communication holes 24235 are opened in the axial direction, and the third communication holes 24235 are closer to the upper cover 243 than the second communication holes 24233. The electric ball valve 1 further comprises a third screw 27, the circuit board 241 is provided with a connecting hole corresponding to the third communicating hole 24235, the third screw 27 penetrates through the connecting hole of the circuit board 241 and extends into the third communicating hole 24235 to be screwed, the first pin 224 and the second pin 24241 are in compression joint or welded with the circuit board 241, the tail ends of the first pin 224 and the second pin 24241 are in a fishtail shape in the embodiment, the first pin 224 and the second pin 24241 can be in compression joint with the circuit board 241, and disassembly is convenient. The circuit board 241 can be connected to the housing 242 by the third screws 27, in this embodiment, the number of the third screws 27 is at least 2, and the rotation of the circuit board in the circumferential direction can be prevented by at least 2 third screws. Similarly, the circuit board 241 may be connected to the housing 242 by other detachable connections, such as a snap connection, and not limited to a threaded connection. Stator module 22 and circuit board 241 are connected through detachable mode with casing 242, compare with original stator module and casing secondary integrated into one piece technology of moulding plastics, have simplified manufacturing process, have reduced manufacturing cost, have reduced the cracked risk of enameled wire when the secondary is moulded plastics, have also reduced cost of maintenance. Referring to fig. 7, one end of the bottom 2422 of the housing close to the valve body is provided with 2 positioning pillars 24224, and the corresponding valve body 41 is provided with positioning parts, so that the positioning pillars are matched with the positioning parts during assembly, and the positioning and mistake proofing functions can be achieved.

In order to enhance the sealing performance of the electric ball valve and reduce the influence of moisture or dust on the normal operation of the circuit board 241 and the stator assembly 22 caused by the moisture or dust entering the cavity where the circuit board 241 and the coil winding 221 are located, i.e., the control cavity, the control device further has a first sealing ring 244, and the first sealing ring 244 is located between the bottom part 2422 of the housing and the stator assembly 22. The bottom part 2422 of the housing is provided with a first sealing installation groove 24223, the first sealing ring 244 is positioned in the first sealing installation groove 24223, and the upper end of the first sealing ring 244 is in sealing connection with the lower end surface of the stator assembly 22. The first seal ring 244 and the injection molded portion 225 of the stator assembly 22 reduce the ingress of moisture into the control chamber through the connection of the housing to the stator assembly.

In addition, referring to fig. 8-12, the electric ball valve 1 further includes a third pin 226 and a connecting member 227, the material of the connecting member 227 is a metal conductive material, the stator housing 222 is conductively connected to the third pin 226 through the connecting member 227, and the third pin 226 is press-connected to the circuit board 241 and conductively connected to the ground layer of the circuit board. The end of the third pin 226 is also in a fish tail shape, and is connected with the circuit board 241 by compression joint, so that the third pin is convenient to detach. The conductive connection in the technical scheme can conduct electricity between the conductive connection finger and the conductive connection finger, and can be fixedly connected or detachably connected in a mechanical connection mode and the like. The stator housing 222 includes a fitting portion 2222 and a stator housing main body 2221, the fitting portion 2222 is fixedly connected or integrally connected with the stator housing main body 2221 and electrically connected, the fitting portion 2222 is located at the outer circumference of the stator housing main body 2221, one end of the connecting member 227 abuts against the fitting portion 2222 and is electrically connected, and the other end of the connecting member 227 abuts against the third pin 226 and is electrically connected. Third contact pin 226 is the same as first contact pin 224 and is moulded plastics as an organic whole with claw pole plate 223 through moulding plastics as the inserts, part third contact pin 226 stretches out outside injection moulding part 225, stator module 22 still has installation department 2251 through moulding plastics, part third contact pin 226 is located installation department 2251, specifically this part third contact pin 226 is located the middle part or the upper portion of installation department 2251, load into and with third contact pin 226 with connecting piece 227 from installation department 2251 lower extreme, and with stator housing 222 assembly fixed, fixed back installation department 2251 is connected with the cooperation portion, the cooperation portion is connected with the lower extreme butt of connecting piece, installation department 2251 can play the limiting action that moves along the stator housing to the connecting piece, spacing the connecting piece through third contact pin and cooperation portion in axial direction. The movement limit here means that the movement in a certain direction is within a certain limit range, taking the direction shown in fig. 12 of the embodiment as an example, that is, the movement of the connecting piece in the horizontal direction is limited by the size of the mounting part, and the movement cannot exceed the limit range of the mounting part. Through connecting piece 227 and third contact pin 226, stator shell 222 and circuit board 241 conductive connection, when external electromagnetic interference, the electromagnetism that acts on stator shell 222 surface can be followed connecting piece 227, third contact pin 226 and guided to the ground plane of circuit board 241, and the rethread ground plane connects to the ground terminal outward and can realize the ground function, is favorable to reducing the interference of external electromagnetism to electronic ball valve. Specifically, connecting piece 227 is the spring in this embodiment, and the spring has elasticity, through spring elastic connection between third contact pin and the stator shell, plays the cushioning effect, can offset partial stress when electronic ball valve vibrates, is favorable to prolonging electronic ball valve life. In addition, the stator shell and the third contact pin are connected through the connecting piece, so that the welding steps can be reduced, and the production cost is reduced. Of course, the fitting portion may be provided on the inner periphery of the stator housing main body, or the same function may be achieved by changing the structure of the connecting member without providing an additional fitting portion. It can be understood that if only when realizing reducing the interference of external electromagnetism to electric ball valve, other parts of stator module can all be made certain adjustment such as skeleton, claw polar plate, coil winding to the mode that this embodiment gave is not limited to, for example also can adopt stator module and casing secondary to mould plastics integrated into one piece technology, mould plastics whole stator module and casing and become integrative, mould plastics back stator shell and still be connected through connecting piece, third contact pin and circuit board are electrically conducted.

Referring to fig. 13, the rotor assembly 21 includes a rotor 211, a coupling bracket 215, and a shaft portion 216. The rotor 211 is a magnetic rotor comprising permanent magnetic material. The shaft portion 216 forms a central shaft of the rotor assembly 21, the connecting bracket 215 is connected to the rotor 211, and the connecting bracket 215 is in clearance fit with the shaft portion 216. Rotor assembly 21 also includes spacer and coupling sockets 214. The spacer sleeve includes a sleeve 212, an end cap 213. The sleeve 212 is located the radial periphery of rotor 211, and the one end and the end cover 213 of sleeve 212 pass through welded fastening and be connected, and the other end and the connecting seat 214 of sleeve 212 pass through welded fastening and be connected, and rotor, linking bridge, axial part and at least part drive disk assembly are located the space that end cover 213, sleeve 212 and connecting seat 214 formed, and the rotor subassembly passes through connecting seat 214 and is connected with valve body 41 is spacing.

As shown in fig. 13 to 15, the connecting bracket 215 includes a connecting portion 2151, and the connecting bracket 215 is connected to the rotor 211 through the connecting portion 2151 to form an integral body, specifically, the rotor 211 and the connecting bracket 215 may be integrally connected to form an integral body by injection molding, or the rotor 211 and the connecting bracket 215 are respectively connected to form an integral body by injection molding and then are fixedly connected to form an integral body, or the rotor 211 and the connecting bracket 215 are fixedly connected to form an integral body. The connecting bracket 215 further includes a first flange portion 2152, the first flange portion 2152 being protruded in the axial direction, the first flange portion 2152 being located at an upper portion of the connecting portion 2151, specifically, a free end of the first flange portion 2152 being disposed near the end cap 213, and a fixed end of the first flange portion 2152 being fixedly connected or integrally formed with the connecting portion 2151. One end of the shaft part 216 abuts against the end cap 213, the end of the shaft part 216 abutting against the end cap 213 is a first end 2161, and the end of the first end 2161 has a radian and is hemispherical, so that the friction between the shaft part and the end cap 213 during rotation can be reduced. The connecting bracket further includes protrusions 2155, and the protrusions 2155 are uniformly distributed on the outer circumference of the first flange portion 2152.

The transmission member 23 includes a reduction mechanism, which is a planetary reduction mechanism, but the reduction mechanism may be a transmission reduction mechanism of another form as another embodiment. The speed reducing mechanism comprises a sun gear 232 and a planet gear assembly, the sun gear 232 is fixedly connected with the connecting bracket 215, in the embodiment, referring to fig. 14 and 15, the sun gear 232 is connected with the connecting bracket 215 and the rotor 211 through injection molding to form a whole, and the whole is called as a first assembly. The first assembly includes a sun gear 232, a connecting bracket 215, and a rotor 211. The sun gear 232 is located at the lower end of the connecting bracket 215 and extends in the axial direction. The first component has a shaft guide portion that guides and positions the shaft 216. The shaft guide part comprises a first guide part 2153 and a second guide part 2321, the first guide part 2153 is located on the connecting bracket 215, the inner diameter of the first guide part 2153 is slightly larger than the outer diameter of the shaft part 216, the second guide part 2321 is located on the sun gear 232, the second guide part 2321 is coaxially arranged with the first guide part 2153, the inner diameter of the second guide part 2321 is also slightly larger than the outer diameter of the shaft part 216, the second guide part 2321 is communicated with the first guide part 2153 of the connecting bracket, part of the shaft part 216 is located on the first guide part 2153 and the second guide part 2321, and the shaft part 216 is in clearance fit with the connecting bracket 215 and the sun gear 232. Transmission member receiving portion 2110 is located at an inner circumference of rotor 211, transmission member receiving portion 2110 is located at a lower end of the coupling portion, sun 232 is located in transmission member receiving portion 2110, and at least a portion of the planetary gear assembly is also located in transmission member receiving portion 2110.

The speed reducing mechanism comprises at least one planetary wheel assembly, the planetary wheel assembly comprises an output-stage planetary wheel assembly, when the requirement of the transmission ratio is low, only one output-stage planetary wheel assembly can be arranged, and when the requirement of the transmission ratio is increased, the output-stage planetary wheel assembly can also comprise one group to multiple groups of planetary wheel assemblies. The planet wheel assembly furthest from the sun wheel assembly is defined herein as the output stage planet wheel assembly 236.

The first planetary gear assembly 234 and the second planetary gear assembly 235 have the same structure, and here, taking the first planetary gear assembly 234 as an example, referring to fig. 17 and 18, the 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 column gear 23432 and a second mounting plate 23433, the fixed shaft 23431 is fixedly connected or integrally formed with one end face of the second mounting plate 23433, and the column gear 23432 is fixedly connected or integrally formed with the other end face of the second mounting plate 23433, specifically, the fixed shaft 23431, the column gear 23432 and the second mounting plate 23433 may be formed by injection molding the planetary carrier 2343, or by integrally forming the planetary carrier by injection molding, and integrally forming the fixed shaft 23431, the column gear 23432 and the second mounting plate 23433. The fixed shafts 23431 are disposed substantially perpendicular to the second mounting plate 23433 and are located on the circumference of a set distance from the center line of the second mounting plate 23433, the number of the fixed shafts 23431 corresponds to the number of the planetary wheels 2341, and the number of the planetary wheels 2341 is three in this embodiment. The column gear 23432 is disposed coaxially with the second mounting plate 23433, the column gear 23432 is substantially perpendicular to the second mounting plate 23433, the column gear 23432 has a second through hole 23434, the second through hole 23434 extends in the direction of the column gear axis, and the second mounting plate 23433 correspondingly connected to the column gear 23432 also has a third through hole 23435, the second through hole 23434 being substantially coaxial with and substantially the same in diameter as the third through hole 23435 and communicating with each other. The planet wheel 2341 is located the fixed axle 23431 periphery, and the planet wheel 2341 passes through the fixed axle and sets up between first mounting panel 2342 and second mounting panel 23433 with the mode that can rotate, and first mounting panel 2342 has middle part through-hole 2342a, and after the sun gear 232 passed the middle part through-hole 2342a of first mounting panel, sun gear 232 was connected with the inboard meshing of three planet wheel 2341, and this is defined, and one side that planet wheel 2341 is close to planet wheel subassembly central axis is inboard, and the relative opposite side is the outside. The shaft portion 216 passes through the third through hole 23435 and the second through hole 23434, and is loosely fitted to the second mounting plate 23433 and the column gear 23432.

The first planetary gear set 234 may further include a first spacer 2344, the first spacer 2344 may be one or two or more spacers, and certainly, the first spacer may not be provided, in this embodiment, the first spacer 2344 includes an upper spacer 2344a and a lower spacer 2344b, the upper and lower spacers are named according to their relative positions, the upper spacer 2344a is disposed opposite to the lower spacer 2344b, the upper spacer 2344a and the lower spacer 2344b are located between the second mounting plate 23433 and one end surface of the sun gear 232, the second mounting plate 23433 of the planetary carrier has a mounting portion 23436 recessed in the direction of the column gear, and the upper spacer 2344a and the lower spacer 2344b are located in the mounting portion, which can reduce friction when the second mounting plate rotates. The upper and lower spacers are also clearance fitted to the shaft portion 216. In this embodiment, the upper pad and the lower pad are made of graphite material, but other materials may be used.

The output stage planet wheel assembly 236 comprises planet wheels 2361, a first mounting plate 2362, a gasket 2364 and a planet carrier, the rest of the structure is the same as the first planet wheel assembly except that the structure of the planet carrier is different from that of the first planet wheel assembly 234, and here, for convenience of distinguishing, the planet carrier of the output stage planet wheel assembly is marked as an output stage planet carrier 2363. As shown in fig. 19 and 20, the output stage planet carrier 2363 includes a fixed shaft 23631, a third mounting plate 23632, and a connecting portion 23633, the fixed shaft 23631 is disposed substantially perpendicular to the third mounting plate 23632, the fixed shaft 23631 is disposed on one end surface of the third mounting plate 23632 and is located on a circumference spaced apart from a center line of the third mounting plate 23632, the connecting portion 23633 is disposed on the other end surface of the third mounting plate 23632, an extending direction of the fixed shaft is opposite to an extending direction of the connecting portion, and unlike the planet carrier 2343 of the first planet gear assembly, the output stage planet carrier 2363 does not have a column gear. The transmission component 23 further includes an output shaft 237, and the output shaft 237 is connected to or integrally formed with an output stage planet carrier 2363, and specifically, one end of the output shaft 237 is connected to or integrally formed with a connecting portion 23633.

The sun gear 232 passes through the central through hole 2342a of the first mounting plate of the first planetary gear assembly 234 and is engaged with the inner sides of the three planetary gears 2341 of the first planetary gear assembly 234, and the lower end of the sun gear 232 abuts against the first gasket 2344 of the first planetary gear assembly. The column gear 23432 of the planet carrier of the first planet wheel assembly penetrates through the middle through hole of the first mounting plate of the second planet wheel assembly 235 and is meshed and connected with the inner sides of the three planet wheels of the second planet wheel assembly 235, and the lower end of the column gear 23432 of the first planet wheel assembly is abutted to the gasket of the second planet wheel assembly. The cylindrical gear of the planet carrier of the second planet wheel assembly 235 passes through the middle through hole of the first mounting plate of the output stage planet wheel assembly 236 and is in meshed connection with the inner sides of the three planet wheels of the output stage planet wheel assembly 236, and the lower end of the cylindrical gear of the second planet wheel assembly 235 is abutted to the gasket of the output stage planet wheel assembly.

The reduction mechanism further includes a fixed ring gear 233, and as shown in fig. 16, the fixed ring gear 233 has an inner peripheral wall with inner teeth 2331, and the first planetary gear set 234, the second planetary gear set 235, and the output stage planetary gear set 236 are at least partially embedded in the fixed ring gear 233. The outer sides of each planet wheel of the first planet wheel assembly 234, the second planet wheel assembly 235 and the output stage planet wheel assembly 236 are in meshed connection with the inner teeth 2331. The stationary ring gear 233 is at least partially built in the rotor assembly 21, which is advantageous in reducing the space of the control device and in miniaturizing the control device. The lower extreme of deciding ring gear 233 is spacing with connecting seat 214 and is connected, and the external diameter of deciding ring gear 233 is less than the internal diameter of rotor 211, and the lateral surface of deciding ring gear 233 has the clearance with the medial surface of rotor 211, and rotor 211 can be for deciding ring gear 233 free rotation.

The other end of the output shaft 237 is fixedly connected or limited to the valve rod 231, in this embodiment, a connecting portion of the output shaft 237 near one end of the valve rod 231 is a non-rotating surface, for example, a D-shaped connecting portion may be provided, the valve rod 231 has a concave portion matched with the connecting portion, the output shaft 237 is inserted into and matched with the valve rod 231, and the valve rod 231 is connected to the valve core ball 3.

Referring to fig. 3 and 13, the rotor assembly 21 further includes a detection magnetic ring 217, the control unit 24 further includes a position sensor 245, the position sensor detects the rotation angle of the shaft by sensing the magnetic field intensity change of the detection magnetic ring, the position sensor 245 may be a hall sensor, and the detection magnetic ring 217 and the position sensor 245 serve as a detection component for detecting the rotation angle of the shaft, and can detect the rotation angle of the shaft. One end of the shaft portion 216 abuts on the end cap 213, and the other end of the shaft portion 216 is connected to the carrier 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 in this order, and is connected to the output shaft 237. In order to reduce the rotational friction of the shaft 216, the shaft 216 is in clearance fit with the connecting carrier 215, the sun gear 232, the first planet gear assembly 234, the second planet gear assembly 235, and the output stage planet gear assembly 236. The transmission component has a fourth accommodating cavity 238, the fourth accommodating cavity 238 is partially located in the output shaft 237, the fourth accommodating cavity 238 is partially located in the valve rod 231, the output shaft 237 has a fourth through hole 2371, the fourth through hole 2371 is communicated with the fourth accommodating cavity 238, one end of the shaft portion 216, which is far away from the end cover 213, can pass through the fourth through hole 2371, and a part of the shaft portion is located in the fourth accommodating cavity 238, the shaft portion 216 is connected with the output shaft 237, and the shaft portion 216 is driven by the output shaft 237 to rotate circumferentially.

The detection magnetic ring 217 is sleeved on the radial periphery of the shaft portion 216 and is in limit connection or fixed connection with the shaft portion 216, so that the shaft portion can drive the detection magnetic ring 217 to rotate, and the detection magnetic ring 217 is located on the inner side of the connecting support 215. The rotor assembly is provided with a detection magnetic ring accommodating part 2154, the detection magnetic ring accommodating part 2154 is positioned on the inner side of the first flange part 2152 of the connecting support, the detection magnetic ring 217 is positioned on the detection magnetic ring accommodating part 2154, a certain gap is formed between the upper end surface of the detection magnetic ring 217 and the end cover 213, a certain gap is formed between the lower end surface of the detection magnetic ring 217 and the connecting support 215, a certain gap is also formed between the outer peripheral surface of the detection magnetic ring 217 and the inner wall of the first flange part 2152, and the detection magnetic ring 217 can freely rotate along with the shaft part 216. The material of the detection magnetic ring can be sintered Ru FeB, or can be other materials such as ferrite, and the detection magnetic ring is provided with at least two different magnetic poles. The position sensor 245 is located above the detection magnetic ring 217 and electrically and/or signal-connected to the circuit board 241, and in this embodiment, the position sensor 245 is located at one end of the circuit board close to the rotor assembly and fixedly connected to the circuit board 241. In order to ensure the accuracy of the detecting assembly, the distance between the position sensor and the detecting magnetic ring should not be too large, an optional embodiment is that the distance between the position sensor and the detecting magnetic ring is between 2-4mm, because the position sensor 245 is disposed at one end of the circuit board 241 close to the rotor assembly, the magnetic induction surface of the position sensor is disposed close to the rotor assembly, the circuit board 241 is disposed above the rotor assembly 21, such that the detecting magnetic ring 217 is disposed at one end of the rotor assembly 21 close to the circuit board 241, the distance between the position sensor and the detecting magnetic ring is relatively short, when the detecting magnetic ring 217 rotates along with the shaft portion 216, the position sensor can accurately detect the magnetic pole change generated by the rotation of the detecting magnetic ring, and further feed back to the circuit board 241, the circuit board 241 can calculate the angle that the detecting magnetic ring 217 rotates along with the shaft portion 216, the shaft portion 216 is driven by the output shaft 237, the output shaft 237 also drives the valve rod 231 to rotate, the valve rod 231 drives the valve core ball 3 to rotate, so that the rotation angle of the valve core ball 3 along with the valve rod 231 can be detected, the position of the valve core ball 3 is fed back, and the control precision of the electric ball valve is improved. In addition, the detection magnetic ring is arranged in the detection magnetic ring accommodating part of the rotor assembly, so that the overall structure of the control device is relatively compact, and the space is reasonably utilized.

The rotor assembly 21 further includes a buffer portion, which directly or indirectly abuts against an end of the shaft portion, and the buffer portion may be the first spring 2181 in this embodiment. The rotor assembly 21 further includes a limiting portion, in this embodiment, the buffering portion is indirectly abutted to the end portion of the shaft portion through the limiting portion, and the limiting portion may be the first stopper 2182. The first spring 2181 and the first stopper 2182 are located in the fourth receiving chamber 238. The first stop 2182 is connected to the end of the shaft 216 in a limiting manner or fixed manner, and the end of the shaft 216 refers to the end of the shaft 216 away from the end cap 213. Specifically, the first stopper has a concave portion, and the shaft portion 216 has a convex portion at the end thereof, and the concave portion is engaged with the convex portion for limiting. The one end of first spring 2181 is located the chamber bottom that the chamber 238 was held to the fourth, and the chamber bottom that the chamber 238 was held to the fourth is located valve rod 231, and consequently the one end and the valve rod butt of first spring 2181, the other end and the first dog 2182 butt of first spring 2181, first spring 2181 all is in the state by first dog and valve rod compression when electronic ball valve work or not working, and first spring 2181 can provide ascending elasticity for axial region 216, is favorable to avoiding the axial region to keep away from the end cover gradually at the rotation in-process. Through buffer portion and spacing portion, be favorable to reducing and detect magnetic ring and axial float of axial at the rotation in-process to improve detection assembly's detection precision and stationarity, improve the control precision of electric ball valve.

The rotor assembly 21 further includes first and second bearings 2191, 2192, and third bearings 2193. In the present 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 further includes a first bearing mounting portion 2195, the first bearing mounting portion 2195 is located between an outer side wall of the first flange portion 2152 of the connection bracket and an inner wall of the sleeve 212 as viewed in the radial direction, the first bearing mounting portion 2195 is located between the end cover 213 and the connection bracket 215 as viewed in the axial direction, the first bearing mounting portion 2195 is located between a lower end surface of the end cover 213 and an upper end surface of the rotor 211, the first bearing 2191 is located in the first bearing mounting portion 2195, and the first bearing 2191 has a certain gap from the end cover 213. The outer side wall of the first bearing 2191 is in contact with the inner wall of the sleeve 212, the inner side wall of the first bearing 2191 is in contact with the outer side wall of the first flange portion 2152, the lower end surface of the first bearing 2191 near the inner side wall is also in contact with the connecting bracket 215, specifically, the lower end surface of the inner side wall of the first bearing 2191 is in contact with the protrusion 2155 of the connecting bracket 215, and the first bearing 2191 is in interference fit with the connecting bracket 215 and the sleeve 212. First bearing 2191 and linking bridge 215, sleeve 212 interference fit, linking bridge 215 is connected with rotor 211 and sun gear 232 again, and first bearing 2191 is fixed with sleeve 212, can improve the axiality of rotor and sleeve, sun gear through setting up first bearing 2191, reduces the rotatory frictional force of rotor and can improve rotor pivoted stationarity and transmission efficiency. In addition, this technical scheme makes linking bridge and sleeve fixed through first bearing 2191's setting, and consequently the rotor can not need to be fixed through the axial region with the axial region separation, and the sun gear also can separate with the axial region, is favorable to eliminating rotor and drive disk assembly to the axial region and exerts stress's influence, is favorable to improving the life of axial region, is favorable to improving the stability that the detection element detected, is favorable to improving drive disk assembly's transmission efficiency.

Referring to fig. 2 and 13, the second bearing 2192 is sleeved on the outer circumference of the output shaft 237 in the radial direction, the second bearing 2192 is located below the output stage carrier 2363, the second bearing 2192 has a second flange portion 2192a, the second flange portion 2192a extends outwards in the radial direction, the connecting seat 214 has a second stepped portion 2141, and the second flange portion 2192a abuts against the second stepped portion 2141. Furthermore, the electric ball valve 1 further includes a second gasket 2194, the second gasket 2194 is fitted around the outer periphery of the output shaft 237 in the radial direction, the second gasket 2194 may 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 carrier 2363 and the second flange portion 2192a, one end surface of the second gasket 2194 may abut against the lower end surface of the output stage carrier 2363, and the other end surface of the second gasket assembly 2194 may abut against the upper end surface of the second flange portion 2192 a. The provision of the second bearing 2192 and second washer 2194 facilitates reducing frictional losses during rotation of the output stage planet carrier and output shaft. Of course, the second bearing may not be provided, and one end surface of the second gasket 2194 may abut against the lower end surface of the output stage carrier 2363, and the other end surface of the second gasket 2194 may directly abut against the second stepped portion 2141. The end cap 213 has a third bearing mounting portion 2131, and the third bearing 2193 is located the spacing connection of third bearing mounting portion 2131 and end cap, and the radial periphery of axle part 216 is located to the third bearing 2193 cover, and the first end 2161 setting that the third bearing 2193 is close to axle part 216, and the third bearing is favorable to reducing the frictional force when the axle part rotates.

Referring to fig. 2 and 13, the electric ball valve further includes a compression nut 42, and the connecting seat 214 is fixedly connected to the valve body 41 through the compression nut 42. The valve body 41 has a third step portion 412, the connecting seat 214 is at least partially located on the valve body 41, the connecting seat 214 has a third flange portion 2142, the third flange portion 2142 extends along the radial direction, a lower surface of the third flange portion 2142 abuts against the third step portion 412, the compression nut 42 is sleeved on a radial outer periphery of a main body side wall of the connecting seat 214, the compression nut 42 contacts with an upper surface of the third flange portion 2142, and the compression nut 42 is in threaded connection with the valve body 41, so that the connecting seat 214 is fixedly connected with the valve body 41. In order to enhance the sealing performance of the electric ball valve, the electric ball valve further includes a second sealing ring 43, and the second sealing ring 43 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 is beneficial to preventing the working medium from leaking out.

The electric ball valve further includes a fourth bearing 44 and a third gasket 45, the fourth bearing 44 is sleeved on the radial outer periphery of the valve rod 231, the valve body 41 has a fourth step portion 413, the fourth step portion 413 is located below the third step portion 412, the fourth bearing 44 is specifically a sliding bearing and has a fourth flange portion 441, and the fourth flange portion 441 is abutted to the fourth step portion 413. The third gasket 45 is sleeved on the radial outer periphery of the valve rod 231 and located between the valve rod 231 and the fourth flange portion 441, and the third gasket 45 may be a single gasket or a combination of two gaskets similar to the first gasket 2344. Of course, the fourth bearing may not be provided, and one end surface of the third gasket 45 may abut against the valve rod 231, and the other end surface of the third gasket 45 may directly abut against the fourth stepped portion 413. The connecting seat 214 has a first mounting cavity 2143, and a portion of the stem 231 is located in the first mounting cavity 2143, which is beneficial to reducing the length of the valve body in the axial direction and the miniaturization of the valve body. In addition, first subassembly has integrateed linking bridge, rotor, sun gear to having formed detection magnetic ring holding portion, transmission part holding portion, axial region guide part, still having formed first bearing installation department with the sleeve cooperation, the design can utilize the space rationally as far as possible like this, reduces the volume of electric ball valve, also is favorable to reduction in production cost.

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, the planet gears 2341 rotate around the fixed shafts 23431 and are meshed with the internal teeth 2331 of the fixed gear ring 233 to rotate, circumferential rotation around the sun gear 232 is formed, the first mounting plate 2342 and the planet carrier 2343 are driven to rotate, the column gear 23432 of the planet carrier 2343 drives the planet gears of the second planet gear assembly 235 to rotate, similarly, power is sequentially transmitted to the output stage planet carrier 2363 of the output stage planet gear assembly 236, the output stage planet carrier 2363 drives the output shaft 237 to rotate, the output shaft 237 drives the valve rod 231 to rotate, the valve rod 231 drives the valve core ball 3 to rotate, and the pore passage of the valve core ball is communicated or not communicated with or selectively communicated with one of the circulation passages, thereby opening or closing or switching the flow path of the electric ball valve or controlling the flow of the flow path. In addition, the output shaft 237 also drives the shaft part 216 to rotate, the shaft part 216 is limited or fixed with the detection magnetic ring 217, therefore, the detection magnetic ring 217 also rotates along with the shaft part 216, and the rotation angle of the shaft part, namely the rotation angle of the valve core ball, can be detected through the position sensor 245, and the control precision of the electric ball valve is improved.

The technical scheme also provides a manufacturing method of the electric valve, which comprises the following steps:

a: the assembly of the first component includes the fitting of the stator assembly 22 with the control portion 24.

The assembly of the first component comprises the following steps:

placing the first sealing ring 244 at a corresponding position of the housing 242, specifically, the first sealing installation groove 24223;

pressing the assembled stator assembly 22 into the housing 242 and against the first seal ring 244, and connecting the stator assembly and the housing as a whole through screws; specifically, the housing 242 has a second communication hole 24233, the stator assembly 22 also has a corresponding connection hole 228, when the stator assembly 22 is pressed into the housing 242, the second communication hole 24233 needs to be aligned with the corresponding connection hole 228 of the stator assembly 22, and then the second screw 26 passes through the connection hole 228 of the stator assembly 22 and extends into the second communication hole 24233, and is screwed and fixed, so that the stator assembly is connected with the housing;

the circuit board 241 is placed on the first stepped portion 24234, the circuit board 241 is pressed against the pins (the 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, and the circuit board 241 is connected to the housing 242 by screws. Specifically, the housing 242 has a third communication hole 24235, the circuit board 241 is provided with a connection hole corresponding to the third communication hole 24235, and the third screw 27 is screwed through the connection hole of the circuit board 241 and extends into the third communication hole 24235, thereby achieving the connection of the circuit board 241 and the housing 242.

The upper cover 243 is coupled and sealed with the case 242. The method can be realized by laser welding and the like.

Wherein the assembly of the stator assembly comprises: the framework 229 is obtained by using metal pieces (the claw pole plate 223, the first pin 224, the third pin 226, and the like mentioned above) as inserts to be molded integrally, the coil winding 221 is wound on the framework 229, the connecting piece 227 is placed in a position corresponding to the framework to be abutted against the third pin 226, and the stator housing 222 is connected with the framework 229 by a buckle or other methods. If the stator assembly does not have the third pin and the connector, the assembly process of the two can be reduced accordingly.

b: and assembling the second component, namely matching and assembling the rotor assembly 21 and the transmission component 23.

The assembly of the second part comprises the following steps:

assembling the first package; the assembly of the first package comprises: the third bearing 2193 and the end cover 213 are assembled in a press fit mode, the first bearing 2191 is in interference fit with the sleeve 212, and the end cover 213 and the sleeve 212 are fixedly welded; arranging one end of a component of the shaft part 216 and the detection magnetic ring 217 in a third bearing 2193, specifically arranging a first end 2161 of the shaft part in the third bearing 2193, fixing the shaft part through a tool, and then connecting the rotor 211, the connecting bracket 215 integrated with the rotor and the sun gear 232 with a first bearing in an assembling way;

assembly of the second package; assembly of the second subassembly includes press fitting the second bearing 2192, the fixed gear ring 233 and the coupling holder 214;

assembling the first subassembly with the second subassembly and the transmission member may comprise: placing a second spacer 2194 in a second package, assembling the output shaft 237 with the output stage planet assembly 236, and assembling the output stage planet assembly 236, the second planet assembly 235, the first planet assembly 234 with the second package; and then assembling the first pre-assembly and the second pre-assembly and fixing the first pre-assembly and the second pre-assembly through welding, specifically, fixing the joint of the sleeve and the connecting seat through welding.

In the assembly of the second component, the assembly of the first subassembly is not sequenced with the assembly of the second subassembly and can be carried out simultaneously.

c: and assembling the third component, namely assembling the second component with the valve body assembly 4 and the valve core in a matching manner.

The assembly of the third part comprises:

assembling the second seal ring 43 with the valve body assembly 4;

placing a first stop block 2182 and a first spring 2181 in an inner cavity formed by the output shaft, wherein the first stop block 2182 wraps the tail end of the shaft part 216 in the output shaft 237, and one end of the first spring 2181 is abutted against the first stop block 2182; of course, the first spring 2181 may be placed in the fourth receiving cavity 238 of the valve rod, and the first stopper is placed in the inner cavity of the output shaft 237 and covers the end of the shaft 216;

the second component, the first stopper and the first spring are inserted into the valve stem 231 through the output shaft 237, the other end of the first spring 2181 is disposed in the fourth receiving cavity 238 in the valve stem and contacts the second sealing ring 43 through the third flange portion 2142 of the connecting seat, and the second component is connected to the valve body assembly 4 by tightening the compression nut 42.

Assembling the valve rod, the valve core, the fourth bearing, the third gasket and the valve body assembly; the valve rod and the valve body are assembled, and the valve rod is connected with the valve core in an inserting mode.

d: and connecting the first part with the third part.

The connection of the first part and the third part comprises the following steps: and pressing the first part from the upper part of the third part, and connecting the first part and the third part into a whole through a screw. The rotor assembly 21 is at least partially located on the inner periphery of the stator assembly 22, and is aligned with the first through hole 24222 of the housing 242, the screw hole reserved in the valve body assembly 4 and the positioning post, and the first component and the third component are connected by screwing in the first screw 25.

Referring to fig. 21, fig. 21 shows another embodiment of the shaft 216, the buffer portion and the limiting portion of the present invention, which is different from the technical solution shown in fig. 13 mainly in that in this embodiment, the end of the shaft 216 has a concave portion, the corresponding limiting portion is specifically a second stop 2182 ', the second stop 2182 ' has a convex portion, the concave portion cooperates with the convex portion for limiting, and the buffer portion is a second spring 2181 ' in this embodiment, and the second spring 2181 ' abuts against the second stop 2182 '.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims (9)

1. An electric ball valve comprises a driving part, a control part, a transmission part, a valve core ball and a valve body, wherein the valve core ball is accommodated in an inner cavity formed by the valve body, the valve core ball is provided with an inner channel, the control part controls the driving part to operate, the driving part transmits output torque to the transmission part, the valve body is provided with at least two circulation channels communicated with the outside, the transmission part drives the valve core ball to move, and the circulation channels are communicated or not communicated or selectively communicated or not communicated with one of the circulation channels through the inner channel of the valve core ball, and the electric ball valve is characterized in that: the electric ball valve comprises a detection magnetic ring and a position sensor, the position sensor is electrically connected with the circuit board and is in signal connection with the circuit board, the driving portion comprises a rotor assembly, the rotor assembly comprises a shaft portion, the transmission component comprises an output shaft, the shaft portion is connected with the output shaft, the shaft portion can rotate along with the output shaft, the detection magnetic ring is sleeved on the radial periphery of the shaft portion, the detection magnetic ring can rotate along with the shaft portion, the electric ball valve further comprises a buffering portion, and the buffering portion is directly or indirectly abutted to the end portion of the shaft portion.

2. The motorized ball valve of claim 1, wherein: the rotor subassembly includes end cover, sleeve and rotor, sleeve and end cover fixed connection, the rotor is located telescopic interior week, axial region one end with the end cover contact, electric ball valve still includes spacing portion, spacing portion with the axial region is kept away from the tip of end cover is spacing, the buffering portion with spacing portion butt.

3. The motorized ball valve of claim 2, wherein: the transmission component comprises a valve rod, the output shaft is fixedly connected or in limiting connection with the valve rod, the valve rod is connected with the valve core ball, the transmission component is provided with a fourth containing cavity, the fourth containing cavity is located between the output shaft and the valve rod, at least part of the limiting portion and the buffering portion are located in the fourth containing cavity, and the buffering portion is abutted to the valve rod.

4. An electric ball valve according to any one of claims 1 to 3, wherein: the circuit board is located above the rotor assembly, the position sensor is located at one end, close to the rotor assembly, of the circuit board, the sensing surface of the position sensor is arranged close to the rotor assembly, the detection magnetic ring is sleeved at one end, close to the rotor assembly, of the shaft portion, and the position sensor is located above the detection magnetic ring.

5. A motorized ball valve as set forth in claim 3, wherein: part of the fourth containing cavity is located in the output shaft, part of the fourth containing cavity is located in the valve rod, the output shaft is provided with a fourth through hole, the fourth through hole of the output shaft is communicated with the fourth containing cavity, and the end part, far away from the end cover, of the shaft part penetrates through the fourth through hole and then is located in the fourth containing cavity.

6. An electrically operated ball valve according to claim 3 or 5, wherein: the limiting portion comprises a first stop block, the first stop block is provided with a concave portion, the end portion, far away from the end cover, of the shaft portion is provided with a convex portion, the concave portion is matched with the convex portion, the buffering portion comprises a first spring, one end of the first spring is abutted to the first stop block, the other end of the first spring is abutted to the valve rod, and the first spring is compressed by the first stop block and the valve rod.

7. An electrically operated ball valve according to claim 3 or 5, wherein: the limiting portion comprises a second stop block, the second stop block is provided with a convex portion, the end portion, far away from the end cover, of the shaft portion is provided with a concave portion, the concave portion is matched with the convex portion, the buffering portion comprises a second spring, one end of the second spring is abutted to the second stop block, the other end of the second spring is abutted to the valve rod, and the second spring is compressed by the second stop block and the valve rod.

8. An electric ball valve according to any one of claims 1 to 3, wherein: the electric ball valve further comprises a third bearing, the third bearing is sleeved on the shaft part and one end, contacted with the end cover, of the shaft part, and the third bearing is fixedly or in limited connection with the end cover.

9. An electric ball valve according to any one of claims 1 to 8, wherein: the transmission component comprises a sun wheel, a planetary wheel component and a fixed gear ring, the fixed gear ring is at least partially positioned in the rotor component, the sun wheel and the planetary wheel component are at least partially positioned in the fixed gear ring, the planetary wheel component comprises a first mounting plate, a planetary wheel and a planetary carrier, the planetary wheel is positioned between the first mounting plate and the planetary carrier, the inner side of the planetary wheel is meshed with the sun wheel, the outer side of the planetary wheel is meshed with the fixed gear ring, the planetary carrier is connected with the output shaft, and the rotor drives the sun wheel, the planetary wheel and the planetary carrier to rotate so as to enable the output shaft to rotate; the rotating shaft penetrates through the sun gear and the planet wheel assembly to be connected with the output shaft, and the rotating shaft is in clearance fit with the sun gear and the planet wheel assembly.

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