CN113833890B

CN113833890B - A method for manufacturing an electric valve

Info

Publication number: CN113833890B
Application number: CN202011535026.8A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2020-06-24
Filing date: 2020-12-23
Publication date: 2026-05-05
Anticipated expiration: 2040-12-23
Also published as: CN113833890A

Abstract

The manufacturing approach of a kind of electronic valve, including the stator assembly that is assembled presses into the body of the control part, connect stator assembly and body into a whole through the threaded connection, the circuit board is placed in body and pressed against contact pin of the body, contact pin of the stator assembly, connect circuit board and body through threaded connection, the upper cover is sealingly connected with body. The stator component and the shell are detachably connected, the circuit board and the shell are also detachably connected, and the stator component and the shell are convenient to detach during maintenance, so that the assembly process is optimized, and the production cost and the maintenance cost are reduced.

Description

Manufacturing method of electric valve

Technical Field

The present invention relates to a method for manufacturing an electric valve.

Background

The electric valve can be used in a thermal management system, and the electric valve comprises a control part, a stator assembly, a rotor assembly, a transmission assembly, a valve body assembly and the like, so that how to optimize the manufacturing method of the electric ball valve to reduce the production cost and the maintenance cost is a technical problem.

Disclosure of Invention

The invention aims to provide a manufacturing method of an electric valve, which is beneficial to optimizing the assembly process and reducing the production cost and the maintenance cost.

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

A method of manufacturing an electrically operated valve, comprising the steps of:

The assembly of the first component comprises that the assembled stator component is pressed into the shell of the control part, the stator component and the shell are connected into a whole through threaded connection, the circuit board is arranged in the shell and is in compression joint with the contact pin of the shell and the contact pin of the stator component, the circuit board is connected with the shell through threaded connection, and the upper cover is in sealing connection with the shell.

In the manufacturing method of the technical scheme, the stator assembly of the first part is detachably connected with the shell, the circuit board is detachably connected with the shell, and the circuit board is convenient to detach during maintenance, so that the assembly process is optimized, and the production cost and the maintenance cost are reduced.

Drawings

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

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

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

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

FIG. 8 is a schematic 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 view of the framework of FIG. 9;

FIG. 11 is a schematic elevational structural view of a stator assembly and circuit board combination;

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

FIG. 13 is another cross-sectional schematic view of a rotor assembly, a transmission component 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 view of a perspective view of another angle of the rotor, connecting bracket and sun gear;

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

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

FIG. 18 is a schematic view of an angled perspective of the planet carrier of the first planetary assembly of FIG. 17;

FIG. 19 is an exploded view of the output stage planetary gear assembly and output shaft of FIG. 13;

fig. 20 is a schematic perspective view of an angle of the output stage planet carrier and output shaft of the output stage planetary assembly of fig. 19.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments below:

Referring to fig. 1 to 4, for one embodiment of the electric valve of the present invention, the electric valve may be applied to a thermal management system of a vehicle, and the electric valve may include an electric ball valve, an electronic expansion valve, and the like, and in this embodiment, the electric valve is specifically an electric ball valve. The electric ball valve 1 comprises a control device 2, a valve core, in this embodiment, a valve core ball 3, and the valve body assembly 4 comprises a valve body 41, wherein 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 section, a transmission member 23, and a control section 24. In this embodiment, the driving part includes a rotor assembly 21 and a stator assembly 22, but the driving part may be other forms for outputting torque to the transmission part, the stator assembly 22 is located at the periphery of the rotor assembly 21, the stator assembly 22 has a first accommodating cavity 229, and at least part of the rotor assembly 21 is located in the first accommodating cavity 229. The rotor assembly 21 has a transmission member receiving portion 2110 with at least a portion of the transmission member 23 positioned in the transmission member receiving cavity 2110 of the rotor assembly 21. The transmission member 23 includes a valve stem 231, and the valve stem 231 is connected to the spool ball 3. The control portion 24 includes a circuit board 241, the circuit board 241 being electrically and/or signally connected to the stator assembly 22. Further, the spool ball 3 is provided with an 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 exciting magnetic field, the rotor assembly 21 rotates under the action of the exciting 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, and the inner channel 31 of the valve core ball 3 is communicated with or not communicated with the circulation channels 411 or selectively communicated with or not communicated with one of the circulation channels, so that 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 skeleton 220, the skeleton 220 includes a claw-pole plate 223, a first pin 224 and an injection molding portion 225, the skeleton 220 is formed by integrally injection molding the claw-pole plate 223, the first pin 224 and other metal parts as injection molding inserts, 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 skeleton 220, the stator housing 222 is connected with the skeleton 220, and the coil winding 221 and the claw-pole plate 223 are both located inside the stator housing 222. The stator assembly is assembled as a unitary piece. The first pin 224 is partially encapsulated in the injection molding portion 225, one end of the first pin is electrically connected and/or signal connected to the coil winding 221, and the other end of the first pin 224 extends out of the injection molding portion and can be crimped or welded and fixed with the circuit board 241, so that the stator assembly 22 is electrically connected and/or signal connected to the circuit board 241 through the first pin 224.

Referring to fig. 1-7, the control portion 24 further includes a housing 242 and an upper cover 243, the housing 242 being sealingly connected to the upper cover 243. The housing 242 is integrally formed by injection molding, the housing 242 having a control chamber 2421, the stator assembly 22 and the circuit board 241 being positioned in the control chamber 2421. The housing 242 includes a bottom 2422 and a side 2423, the side 2423 is cylindrical, the side 2423 is disposed substantially perpendicular to the bottom 2422, and the upper cover 243 is connected to the side 2423. The bottom 2422 has a first through hole 24221, the first through hole 24221 is located within the inner circumference of the side 2423, the first through hole 24221 has a diameter that is greater than the 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, preventing the stator assembly from being separated from the control chamber 2421 from the first through hole 24221. The bottom part 2422 further has a first communication hole 24222, the side wall forming the first communication hole 24222 may be provided with or without threads, the first communication 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 communication hole 24222. Referring to fig. 1, the electric ball valve includes a first screw 25, through which the housing 242 can be coupled with the valve body 41, and in order to make the coupling of the housing 242 with the valve body 41 more uniform and firm, the number of the first communication holes 24222 in the present embodiment is 4, and accordingly, screw holes are provided around the valve body and fixed by the first screw 25, respectively. the housing further has positioning ribs 24231, the positioning ribs 24231 are located on the side inner walls 24232, the positioning ribs 24231 protrude from the side inner walls 24232 toward the center of the control chamber 2421, the positioning ribs 24231 extend from the upper end surface of the bottom 2422 toward the upper end portion of the side inner walls 24232 along the axial direction, and adjacent positioning ribs are spaced apart from each other by a certain distance and distributed along the circumferential direction of the side inner walls 24232. The lower end surface of the stator assembly 22 is in contact with the bottom 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, the side walls forming the second communication holes 24233 may be provided with threads or not, the second communication holes 24233 are located at the upper end portion of the side inner wall 24232, the second screw holes 24233 are distributed along the inner circumference of the side part 2423, the adjacent second communication holes 24233 are located at the same level, and the second communication holes 24233 are opened along the axial direction. The electric ball valve further comprises a second screw 26, a connecting hole 228 corresponding to the second communication hole 24233 is formed in the upper end portion of the stator assembly 22, the second screw 26 penetrates through the connecting 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 through the second screw 26 after being screwed. In this embodiment, the number of the second screws is 4, the number of the corresponding connection holes is also 4, and the 4 second communication 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 well connected, and the number of the second screws and the second communication holes can be appropriately increased or reduced. It will be appreciated that as other embodiments, the stator assembly 22 and the housing 242 may be coupled in an axial direction using other removable couplings, such as, but not limited to, a snap-fit coupling.

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 close to the circuit board 241, the interface part 2424 has a third accommodating cavity 24242, the third accommodating cavity 24242 is isolated from communication with the control cavity 2421, the control device further includes a second pin 24241, part of the second pin 24241 is fixed with the housing 242 by injection molding, one end of the second pin 24241 is located in the control cavity 2421, and the electrical connection and/or the signal connection with the circuit board 241 can be achieved by performing crimping or welding fixation with the circuit board 241. The other end of the second pin 24241 is located in the third receiving cavity 24242 for electrical and/or signal connection with the outside, so that electrical and/or signal connection of the circuit board 241 with the outside can be achieved through the interface portion 2424.

The side 2423 of the housing further has a first step part 24234, the first step part 24234 is located on the inner periphery of the side, the first step part 24234 is located above the injection molded part of the stator assembly 22 as seen in the direction shown in fig. 4, the first step part 24234 is closer to the upper cover 243 than the injection molded part of the stator assembly 22, the circuit board 241 abuts against the first step part 24234, and the first step part 24234 plays a role of 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 positioned 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 communication hole 24235, the third screw 27 penetrates through the connecting hole of the circuit board 241 and stretches into the third communication hole 24235 to be screwed, the first contact pin 224 and the second contact pin 24241 are in pressure connection or welding with the circuit board 241, the tail ends of the first contact pin 224 and the second contact pin 24241 are in a fish tail shape, and the circuit board 241 can be connected through pressure connection, so that the electric ball valve is convenient to detach. The circuit board 241 and the housing 242 can be connected by the third screws 27, and the number of the third screws 27 in this embodiment is at least 2, and at least 2 third screws can prevent rotation of the circuit board in the circumferential direction. Likewise, the connection between the circuit board 241 and the housing 242 may be other removable connection, such as a snap connection, and is not limited to a threaded connection. The stator assembly 22 and the circuit board 241 are detachably connected with the housing 242, and compared with the original two-shot molding process of the stator assembly and the housing, the manufacturing process is simplified, the manufacturing cost is reduced, the risk of the broken enameled wire during the two-shot molding is reduced, and the maintenance cost is also reduced. Referring to fig. 7, 2 positioning posts 24224 are provided at one end of the bottom 2422 of the housing close to the valve body, and positioning portions are provided on the corresponding valve body 41, and the positioning posts are matched with the positioning portions during assembly, so that positioning and error proofing functions can be achieved.

In order to enhance the tightness of the electric ball valve, the control device reduces the influence of moisture or dust entering the cavity where the circuit board 241 and the coil windings 221 are located, i.e. the control cavity, on the normal operation of the circuit board 241 and the stator assembly 22, and further comprises a first sealing ring 244, wherein 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 seal mounting groove 24223, and a first seal ring 244 is positioned in the first seal mounting groove 24223, and an upper end of the first seal ring 244 is in sealing connection with a lower end surface of the stator assembly 22. Moisture is reduced from entering the control chamber through the connection of the housing to the stator assembly by the first seal 244 and the injection molded portion 225 of the stator assembly 22.

In addition, referring to fig. 8-12, the electric ball valve 1 further includes a third pin 226 and a connecting piece 227, the connecting piece 227 is made of a metal conductive material, the stator housing 222 is electrically connected with the third pin 226 through the connecting piece 227, and the third pin 226 is in pressure connection with the circuit board 241 and is electrically connected with a ground layer of the circuit board. The tail end of the third contact pin 226 is also in a fish tail shape, and is connected with the circuit board 241 by crimping, so that the third contact pin is convenient to detach. In the technical scheme, the conductive connection fingers can conduct electricity, and can be fixedly connected or detachably connected in a mechanical connection mode. The stator housing 222 includes a mating portion 2222 and a stator housing main body 2221, the mating portion 2222 is fixedly connected or integrally connected with the stator housing main body 2221 and can be electrically connected, the mating portion 2222 is located at the periphery of the stator housing main body 2221, one end of the connecting piece 227 is abutted with the mating portion 2222 and electrically connected, and the other end of the connecting piece 227 is abutted with the third contact pin 226 and electrically connected. the third pin 226 is molded integrally with the claw-pole plate 223 by injection molding as an insert similar to the first pin 224, a part of the third pin 226 extends out of the injection molding part 225, the stator assembly 22 is further formed with a mounting part 2251 by injection molding, a part of the third pin 226 is positioned in the mounting part 2251, specifically, the part of the third pin 226 is positioned in the middle or upper part of the mounting part 2251, a connecting piece 227 is installed from the lower end of the mounting part 2251 and is abutted with the third pin 226, the stator housing 222 is assembled and fixed, the mounting part 2251 is connected with a matching part after fixing, the matching part is abutted with the lower end of the connecting piece, the mounting part 2251 can play a limiting role on the movement of the connecting piece along the stator housing, and the connecting piece is limited in the axial direction through the third pin and the matching part. Here, the movement limitation means that the movement in a certain direction is within a certain limit range, and the direction shown in fig. 12 of this embodiment is taken as an example, that is, the movement of the connecting member in the horizontal direction is limited by the size of the mounting portion, and the movement cannot exceed the limit range of the mounting portion. Through connecting piece 227 and third contact pin 226, stator shell 222 and circuit board 241 can electrically conductive connection, when external electromagnetic interference, the electromagnetism that acts on stator shell 222 surface can follow connecting piece 227, the grounded layer of third contact pin 226 guide to circuit board 241, and the ground function can be realized to the earthing terminal through the grounded layer external connection, is favorable to reducing external electromagnetism to the interference of electric ball valve. Specifically, in this embodiment, the connecting piece 227 is a spring, and the spring has elasticity, and is connected through spring elasticity between third contact pin and the stator shell, plays the cushioning effect, can offset partial stress when electric ball valve vibrates, is favorable to prolonging electric ball valve life. In addition, the technical scheme can reduce welding steps and production cost by connecting the stator shell with the third contact pin through the connecting piece. Of course, the engaging portion may be provided on the inner periphery of the stator housing main body, or no additional engaging portion may be provided, and the same function may be achieved by changing the structure of the connecting member. It can be understood that if only the interference of external electromagnetic to the electric ball valve is to be reduced, other components of the stator assembly such as the skeleton, the claw pole plate, the coil winding, etc. can be adjusted to some extent, and the method is not limited to the method given in the embodiment, for example, a two-shot molding process of the stator assembly and the housing can be adopted, the whole stator assembly and the housing are molded into a whole, and the stator housing is still electrically connected with the circuit board through the connecting piece and the third contact pin after the injection molding.

Referring to fig. 13, the rotor assembly 21 includes a rotor 211, a connection bracket 215, and a shaft portion 216. The rotor 211 is a magnetic rotor comprising permanent magnet material. The shaft portion 216 forms a central axis of the rotor assembly 21, the connection bracket 215 is connected to the rotor 211, and the connection bracket 215 is clearance-fitted with the shaft portion 216. The rotor assembly 21 further includes a spacer sleeve and a coupling mount 214. The spacer comprises a sleeve 212, an end cap 213. The sleeve 212 is located at the radial periphery of the rotor 211, one end of the sleeve 212 is fixedly connected with the end cover 213 through welding, the other end of the sleeve 212 is fixedly connected with the connecting seat 214 through welding, the rotor, the connecting support, the shaft part and at least part of the transmission parts are located in the space formed by the end cover 213, the sleeve 212 and the connecting seat 214, and the rotor assembly is in limit connection with the valve body 41 through the connecting seat 214.

As shown in fig. 13-15, the connection bracket 215 includes a connection portion 2151, the connection bracket 215 is connected with the rotor 211 through the connection portion 2151 as a whole, specifically, the rotor 211 and the connection bracket 215 may be integrally injection-molded and connected as a whole, or the rotor 211 and the connection bracket 215 are respectively injection-molded and then fixedly connected as a whole, or the rotor 211 and the connection bracket 215 are fixedly connected as a whole. The connection bracket 215 further includes a first flange portion 2152, the first flange portion 2152 is protruded along the axial direction, the first flange portion 2152 is located at an upper portion of the connection portion 2151, specifically, a free end of the first flange portion 2152 is disposed near the end cap 213, and a fixed end of the first flange portion 2152 is fixedly connected or integrally formed with the connection portion 2151. One end of the shaft portion 216 abuts against the end cover 213, the end of the shaft portion 216 abutting against the end cover 213 is a first end 2161, and the end of the first end 2161 is hemispherical, so that friction force between the shaft portion and the end cover 213 during rotation of the shaft portion can be reduced. The connection bracket further includes protrusions 2155, the protrusions 2155 being evenly distributed around the outer periphery of the first flange portion 2152.

The transmission member 23 includes a reduction mechanism, which is a planetary reduction mechanism, although as other embodiments, the reduction mechanism may be other forms of transmission reduction mechanism. The reduction mechanism comprises a sun gear 232 and a planetary gear assembly, wherein the sun gear 232 is fixedly connected with the connecting support 215, and in the embodiment, referring to fig. 14 and 15, the sun gear 232, the connecting support 215 and the rotor 211 are connected into a whole through injection molding, 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 connection bracket 215 and extends in the axial direction. The first assembly has a shaft guide that guides and positions the shaft 216. The shaft portion guiding portion includes a first guiding portion 2153 and a second guiding portion 2321, the first guiding portion 2153 is located at the connecting bracket 215, an inner diameter of the first guiding portion 2153 is slightly larger than an outer diameter of the shaft portion 216, the second guiding portion 2321 is located at the sun gear 232, the second guiding portion 2321 is coaxially arranged with the first guiding portion 2153, an inner diameter of the second guiding portion 2321 is also slightly larger than an outer diameter of the shaft portion 216, the second guiding portion 2321 is communicated with the first guiding portion 2153 of the connecting bracket, a portion of the shaft portion 216 is located at the first guiding portion 2153 and the second guiding portion 2321, and the shaft portion 216 is in clearance fit with the connecting bracket 215 and the sun gear 232. The transmission member housing 2110 is located at the inner periphery of the rotor 211, the transmission member housing 2110 is located at the lower end of the connection portion, the sun 232 is located at the transmission member housing 2110, and at least a portion of the planetary gear assembly is also located within the transmission member housing 2110.

The reduction mechanism comprises at least one planetary gear assembly including an output stage planetary gear assembly, and when the transmission ratio is low, only one output stage planetary gear assembly may be provided, and when the transmission ratio is high, a plurality of groups of planetary gear assemblies may be provided in addition to the output stage planetary gear assembly, and in this embodiment, the reduction mechanism includes three groups of planetary gear assemblies, which are sequentially designated as a first planetary gear assembly 234, a second planetary gear assembly 235, and an output stage planetary gear assembly 236 from the near to the far according to the distance from the sun gear 232. The planet assembly furthest from the sun assembly is defined herein as the output stage planet 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 post gear 23432 and a second mounting plate 23433, the fixed shaft 23431 is fixedly connected or integrally formed with one end surface of the second mounting plate 23433, the post gear 23432 is fixedly connected or integrally formed with the other end surface of the second mounting plate 23433, specifically, the fixed shaft 23431, the post gear 23432 and the second mounting plate 23433 may be formed into the planetary carrier 2343 by injection molding, or may be integrally formed into the planetary carrier by injection molding, and the fixed shaft 23431, the post gear 23432 and the second mounting plate 23433 may be integrally formed by injection molding. The fixed shaft 23431 is disposed substantially perpendicular to the second mounting plate 23433 and is located at a circumference set distance from the center line of the second mounting plate 23433, and the number of fixed shafts 23431 is equal to the number of planetary gears 2341, and in this embodiment, the number of planetary gears 2341 is three. The spur gear 23432 is disposed coaxially with the second mounting plate 23433, the spur gear 23432 is substantially perpendicular to the second mounting plate 23433, the spur gear 23432 has a second through hole 23434, the second through hole 23434 extends along the axis direction of the spur gear, and correspondingly, the second mounting plate 23433 connected to the spur gear 23432 also has a third through hole 23435, and the second through hole 23434 is substantially coaxial with the third through hole 23435, has substantially the same diameter, and is communicated with each other. The planet wheel 2341 is sleeved on the periphery of the fixed shaft 23431, the planet wheel 2341 is rotatably arranged between the first mounting plate 2342 and the second mounting plate 23433 through the fixed shaft, the first mounting plate 2342 is provided with a middle through hole 2342a, after the sun wheel 232 passes through the middle through hole 2342a of the first mounting plate, the sun wheel 232 is meshed with the inner sides of the three planet wheels 2341, and one side, close to the central axis of the planet wheel assembly, of the planet wheel 2341 is the inner side, and the opposite side is the outer side. Shaft 216 passes through third throughbore 23435 and second throughbore 23434, and is in clearance fit with second mounting plate 23433 and post gear 23432.

The first planetary gear assembly 234 may further include a first spacer 2344, where the first spacer 2344 may be one spacer or a combination of two or more spacers, or the first spacer 2344 may be omitted, and in this embodiment, the first spacer 2344 includes an upper spacer 2344a and a lower spacer 2344b, the upper spacer 2344a and the lower spacer 2344b are named according to their relative positions, the upper spacer 2344a and the lower spacer 2344b are disposed opposite to each other, the upper spacer 2344a and the lower spacer 2344b are disposed between the second mounting plate 23433 and one end face of the sun gear 232, the second mounting plate 23433 of the planet carrier has a mounting portion 23436 recessed along the column gear direction, and the upper spacer 2344a and the lower spacer 2344b are disposed at the mounting portion, so as to reduce wear during rotation of the second mounting plate. The upper and lower shims are also in clearance fit with the shaft portion 216. In this embodiment, the upper gasket and the lower gasket are made of graphite material, and of course, other materials may be used.

The output stage planetary gear assembly 236 includes a planetary gear 2361, a first mounting plate 2362, a spacer 2364, and a carrier, which is denoted as an output stage carrier 2363 for convenience of distinction, except that the carrier structure is different from that of the first planetary gear assembly 234, and the rest is the same as the first planetary gear assembly. As shown in fig. 19 and 20, the output stage carrier 2363 includes a fixed shaft 23631, a third mounting plate 23632, and a connection portion 23633, the fixed shaft 23631 is disposed substantially perpendicular to the third mounting plate 23632, the fixed shaft 23631 is located on one end surface of the third mounting plate 23632 and is located on a circumference set at a distance from a center line of the third mounting plate 23632, the connection portion 23633 is located on the other end surface of the third mounting plate 23632, and an extending direction of the fixed shaft is opposite to an extending direction of the connection portion, unlike the carrier 2343 of the first planetary gear assembly, the output stage carrier 2363 does not have a spur gear. The transmission member 23 further includes an output shaft 237, and the output shaft 237 is connected to or integrally formed with the output stage carrier 2363, specifically, one end of the output shaft 237 is connected to or integrally formed with the connection portion 23633.

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

The reduction mechanism further includes a stationary ring gear 233, and as shown in fig. 16, an inner peripheral wall of the stationary ring gear 233 has an inner tooth portion 2331, and the first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236 are at least partially disposed inside the stationary ring gear 233. The outer sides of the respective planetary gears of the first planetary gear assembly 234, the second planetary gear assembly 235, and the output stage planetary gear assembly 236 are in meshed connection with the internal teeth portion 2331. The stationary ring gear 233 is at least partially built into 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 ring gear 233 is spacing with connecting seat 214 to be connected, and the external diameter of ring gear 233 is less than the internal diameter of rotor 211, and the lateral surface of ring gear 233 has the clearance with the medial surface of rotor 211, and rotor 211 can freely rotate for ring gear 233.

The other end of the output shaft 237 is fixedly connected or in limited connection with the valve rod 231, in this embodiment, the interface part of the output shaft 237 near one end of the valve rod 231 is a non-rotating surface, for example, may be a D-shaped interface, the valve rod 231 has a concave part matched with the interface part, the output shaft 237 is in plug-in fit with the valve rod 231, and the valve rod 231 is connected with the valve core ball 3.

Referring to fig. 3 and 13 in combination, the rotor assembly 21 further includes a detecting magnetic ring 217, the control part 24 further includes a position sensor 245, which detects the shaft turning angle by sensing a change in the magnetic field strength of the detecting magnetic ring, and the position sensor 245 may be a hall sensor, and the detecting magnetic ring 217 and the position sensor 245 serve as detecting components for detecting the shaft turning angle, and can detect the shaft turning angle. One end of the shaft portion 216 abuts against the end cover 213, and the other end of the shaft portion 216 is connected to the support 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 order, and is connected to the output shaft 237. To reduce rotational friction of the shaft 216, the shaft 216 is in clearance fit with the connecting carrier 215, sun gear 232, first planetary gear assembly 234, second planetary gear assembly 235, and output stage planetary gear assembly 236. The transmission member has a fourth accommodation chamber 238, the fourth accommodation chamber 238 is partially located at the output shaft 237, the fourth accommodation chamber 238 is partially located at the valve rod 231, the output shaft 237 has a fourth through hole 2371, the fourth through hole 2371 communicates with the fourth accommodation chamber 238, one end of the shaft portion 216 remote from the end cap 213 can pass through the fourth through hole 2371, and a part of the shaft portion is located in the fourth accommodation chamber 238, the shaft portion 216 is connected with the output shaft 237, and the shaft portion 216 is driven to circumferentially rotate by the output shaft 237.

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

The rotor assembly 21 further includes a buffer portion, which in this embodiment may be the first spring 2181, directly or indirectly abutting against an end of the shaft portion. The rotor assembly 21 further includes a limiting portion, where in this embodiment, the buffer portion is indirectly abutted to the end portion of the shaft portion through the limiting portion, and the limiting portion may 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 in limited or fixed connection with the end of the shaft 216, where 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 terminates with a convex portion, and the concave portion cooperates with the convex portion to limit. One end of the first spring 2181 is located at the bottom of the fourth accommodating cavity 238, and the bottom of the fourth accommodating cavity 238 is located at the valve rod 231, so that one end of the first spring 2181 is abutted against the valve rod, the other end of the first spring 2181 is abutted against the first stop 2182, the first spring 2181 is in a state compressed by the first stop and the valve rod when the electric ball valve works or does not work, and the first spring 2181 can provide upward elastic force for the shaft 216, so that the shaft is prevented from being gradually far away from the end cover in the rotating process. Through buffer portion and spacing portion, be favorable to reducing and detect magnetic ring and axial float of shaft portion in the rotation in-process to improve the detection precision and the stationarity of detecting the subassembly, improve the control precision of electric ball valve.

The rotor assembly 21 further comprises a first bearing 2191 and a second bearing 2192, 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 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 seen in a radial direction, the first bearing mounting portion 2195 is located between the end cover 213 and the connection bracket 215 as seen in the axial direction, the first bearing mounting portion 2195 is located between a lower end face of the end cover 213 and an upper end face of the rotor 211, the first bearing 2191 is located at the first bearing mounting portion 2195, and the first bearing 2191 has a certain gap with the end cover 213. The outer side wall of the first bearing 2191 contacts with the inner wall of the sleeve 212, the inner side wall of the first bearing 2191 contacts with the outer side wall of the first flange portion 2152, the lower end face of the first bearing 2191 near the inner side wall also contacts with the connection bracket 215, specifically the lower end face of the inner side wall of the first bearing 2191 contacts with the projection 2155 of the connection bracket 215, and the first bearing 2191 is interference fit with the connection bracket 215, the sleeve 212. The first bearing 2191 is in interference fit with the connecting support 215 and the sleeve 212, the connecting support 215 is connected with the rotor 211 and the sun gear 232, the first bearing 2191 is fixed with the sleeve 212, the coaxiality of the rotor, the sleeve and the sun gear can be improved through the arrangement of the first bearing 2191, the friction force of the rotor rotation is reduced, and the stability and the transmission efficiency of the rotor rotation can be improved. In addition, this technical scheme makes linking bridge and sleeve fixed through the setting of first bearing 2191, and consequently the rotor can be separated with the shaft part and need not be fixed through the shaft part, and the sun gear also can be separated with the shaft part, is favorable to eliminating the influence that rotor and drive unit applyed stress to the shaft part, is favorable to improving the life of shaft part, is favorable to improving the stability that detects the subassembly, is favorable to improving drive unit's transmission efficiency.

Referring to fig. 2 and 13 in combination, the 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 carrier 2363, the second bearing 2192 has a second flange portion 2192a, the second flange portion 2192a extends outwards in the radial direction, the connection 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 further includes a second gasket 2194, the second gasket 2194 is sleeved on the radial outer periphery of the output shaft 237, 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 2192a, one end face of the second gasket 2194 can be abutted against the lower end face of the output stage carrier 2363, and the other end face of the second gasket assembly 2194 can be abutted against the upper end face of the second flange 2192 a. The provision of the second bearings 2192 and second shims 2194 helps to reduce friction losses during rotation of the output stage carrier and output shaft. Of course, the second bearing may not be provided, and one end surface of the second spacer 2194 may abut against the lower end surface of the output stage carrier 2363, and the other end surface of the second spacer 2194 may abut against the second step 2141 directly. The end cap 213 has a third bearing installation portion 2131, the third bearing 2193 is located at the third bearing installation portion 2131 and is in limited connection with the end cap, the third bearing 2193 is sleeved on the radial outer periphery of the shaft portion 216, the third bearing 2193 is disposed near the first end 2161 of the shaft portion 216, and the third bearing is beneficial to reducing friction force when the shaft portion rotates.

Referring to fig. 2 and 13 in combination, the electric ball valve further includes a compression nut 42, and the connection seat 214 is fixedly connected with the valve body 41 through the compression nut 42. The valve body 41 has a third step portion 412, the connection seat 214 is at least partially located on the valve body 41, the connection seat 214 has a third flange portion 2142, the third flange portion 2142 extends along the radial direction, the lower surface of the third flange portion 2142 abuts against the third step portion 412, the compression nut 42 is sleeved on the radial periphery of the main body side wall of the connection seat 214, the compression nut 42 contacts with the 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 connection 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 comprises a second sealing ring 43, wherein the second sealing ring 43 is positioned between the valve body 41 and the connecting seat 214, in particular between the third flange portion 2142 and the third step portion 412, so as to be 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 abuts against the fourth step portion 413. The third gasket 45 is disposed around the radial outer periphery of the valve stem 231 and between the valve stem 231 and the fourth flange 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 stem 231, and the other end surface of the third gasket 45 may directly abut against the fourth step 413. The connecting seat 214 has a first installation cavity 2143, and a part of the valve rod 231 is located in the first installation cavity 2143, which is beneficial to reducing the length of the valve body in the axial direction and to miniaturizing the valve body. In addition, the first component integrates a connecting support, a rotor and a sun gear, forms a detection magnetic ring accommodating part, a transmission part accommodating part and a shaft part guiding part, and also forms a first bearing mounting part in cooperation with the sleeve, so that the design can reasonably utilize the space as much as possible, reduce the volume of the electric ball valve, and is also beneficial to reducing the production cost.

The working process of the electric ball valve 1 is that a circuit board 241 controls a stator assembly 22 to generate an excitation magnetic field, a rotor assembly 21 rotates under the action of the excitation magnetic field, the rotor assembly 21 drives a sun gear 232 to rotate, the sun gear 232 drives a planet gear 2341 of a first planet gear assembly 234 to rotate, the planet gear 2341 rotates around a fixed shaft 23431 of the planet gear 2341 and simultaneously is meshed with an internal tooth part 2331 of a fixed gear 233 to rotate, circumferential rotation taking the sun gear 232 as a center is formed, thereby driving a first mounting plate 2342 and a planet carrier 2343 to rotate, a column gear 23432 of the planet carrier 2343 drives a planet gear of a second planet gear assembly 235 to rotate, power is sequentially transmitted to an output stage planet carrier 2363 of an output stage planet gear assembly 236, the output stage planet carrier 2363 drives an output shaft 237 to rotate, the output shaft 237 drives a valve rod 231 to rotate, and the valve rod 231 drives a valve core ball 3 to rotate, so that a pore canal of the valve core ball is communicated with or not communicated with one of the circulation channels or is selectively communicated with or not communicated with one of the circulation channels, and thus the circulation path of the electric ball valve is opened or closed or switched or the flow of the flow path is controlled. In addition, the output shaft 237 drives the shaft 216 to rotate, and the shaft 216 and the detecting magnetic ring 217 are limited or fixed, so that the detecting magnetic ring 217 also rotates along with the shaft 216, and the rotating angle of the shaft, namely the rotating 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:

The assembly of the first component includes the mating assembly of the stator assembly 22 with the control portion 24.

The assembly of the first component comprises the following steps:

Placing a first seal 244 in a position corresponding to the housing 242, specifically the first seal mounting groove 24223 described above;

Specifically, the housing 242 is provided with a second communication hole 24233, the stator assembly 22 is also provided with a corresponding connection hole 228, the second communication hole 24233 is required to be aligned with the corresponding connection hole 228 of the stator assembly 22 when the stator assembly 22 is pressed into the housing 242, and then the connection between the stator assembly and the housing is realized by passing the second screw 26 through the connection hole 228 of the stator assembly 22 and extending into the second communication hole 24233, tightening and fixing;

The circuit board 241 is placed on the first step 24234, and the circuit board 241 is crimped with the pins (the second pins 24241) of the housing 242 and the pins (including the first pins 224 and the third pins 226) of the stator assembly 22, and then the circuit board 241 is connected with 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, so that the connection of the circuit board 241 and the housing 242 is realized.

The upper cover 243 is coupled with the housing 242 and sealed. In particular, the method can be realized by means of laser welding and the like.

The assembly of the stator assembly includes obtaining the skeleton 229 by integrally injection molding with metal members (the claw pole plate 223, the first pin 224, the third pin 226, etc.) as inserts, winding the coil winding 221 around the skeleton 229, placing the connecting member 227 in a corresponding position of the skeleton to make it contact with the third pin 226, and connecting the stator housing 222 with the skeleton 229 by a buckle or other means. If the stator assembly does not have the third pin and the connector, the assembly process of both may be reduced accordingly.

And b, assembling the second component, wherein the second component comprises the matching assembly of the rotor assembly 21 and the transmission component 23.

The assembly of the second component comprises the following steps:

The assembly of the first pre-assembly comprises the assembly of a third bearing 2193 and an end cover 213 by press fitting, the interference fit of the first bearing 2191 and a sleeve 212, the welding fixation of the end cover 213 and the sleeve 212, the assembly of a shaft part 216 and a magnetic ring 217 with one end arranged in the third bearing 2193, in particular a first end 2161 of the shaft part arranged in the third bearing 2193, and the press fitting fixation of a rotor 211, a connecting bracket 215 integrated with the rotor, a sun gear 232 and the first bearing;

the second package assembly comprises the step of press fitting the second bearing 2192, the fixed gear ring 233 and the connecting seat 214;

assembling the first package with the second package and the transmission component may include placing a second gasket 2194 in the second package, 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, and the first planetary gear assembly 234 with the second package, and assembling the first package with the second package and fixing the first package with the second package by welding, specifically fixing the joint of the sleeve and the connecting seat by welding.

In the assembly of the second component, the assembly of the first package and the assembly of the second package are not sequential, and can be performed simultaneously.

And c, assembling a third component, wherein the third component comprises the second component which is matched and assembled with the valve body assembly 4 and the valve core.

The assembly of the third component comprises:

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

The first stop 2182 and the first spring 2181 are arranged in an inner cavity formed by the output shaft, the first stop 2182 wraps the tail end of the shaft part 216 positioned in the output shaft 237, one end of the first spring 2181 is abutted against the first stop 2182, however, the step can also be that the first spring 2181 is arranged in the fourth accommodating cavity 238 of the valve rod, and the first stop is arranged in the inner cavity of the output shaft 237 and wraps the tail end of the shaft part 216;

The component II, the first stop block and the first spring are inserted into the valve rod 231 through the output shaft 237, the other end of the first spring 2181 is arranged in the fourth accommodating cavity 238 in the valve rod, the component II contacts with the second sealing ring 43 through the third flange part 2142 of the connecting seat, and the component II is connected with the valve body component 4 by screwing the compression nut 42.

The valve rod is assembled with the valve core, the fourth bearing and the third gasket are assembled with the valve body assembly, the fourth bearing is assembled with the valve body, then the third gasket is arranged on the end face of the fourth bearing, the valve rod is assembled with the valve body, and the valve rod is connected with the valve core through plug-in connection.

And d, connecting the first component with the third component.

The connection of the first component and the third component comprises the step of pressing the first component from the upper side of the third component and connecting the first component and the third component into a whole through screws. The rotor assembly 21 is positioned at least partially on the inner periphery of the stator assembly 22, aligned with the screw holes and positioning posts reserved for the first communication hole 24222 of the housing 242 and the valve body assembly 4, and the first and third members are connected by screwing the first screw 25.

According to the manufacturing method, the stator assembly and the control part are assembled to obtain the first part, the rotor assembly and the transmission part are assembled to obtain the second part, the valve body assembly and the valve core are assembled to obtain the third part, the first part and the third part are connected through threads, the first part and the second part can be assembled respectively, the assembly process is optimized, and the production cost is reduced.

It should be noted that the above-mentioned embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and 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 can be modified or substituted by equivalent ones, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are intended to be covered by the scope of the claims of the present invention.

Claims

1. A method for manufacturing an electric valve, characterized by comprising the following steps:

The assembly of component one includes pressing the assembled stator assembly into the housing of the control unit, connecting the stator assembly and the housing as a whole through threaded connection, placing the circuit board inside the housing and pressing it into the pins of the housing and the pins of the stator assembly, connecting the circuit board to the housing through threaded connection, and sealing the top cover to the housing.

Assembly of component two includes:

The assembly of the first pre-assembled component includes press-fitting the third bearing and the end cap, with the first bearing and the sleeve having an interference fit, and fixing the end cap and the sleeve; placing one end of the shaft and the detection magnetic ring assembly inside the third bearing and fixing it; then press-fitting the rotor and the connecting bracket and sun gear integral with the rotor to the first bearing, wherein the detection magnetic ring is sleeved on the radial outer periphery of the shaft; the control unit includes a position sensor, which can sense the magnetic field strength of the detection magnetic ring; the position sensor is located above the detection magnetic ring and is electrically and/or signal-connected to the circuit board; the circuit board is located above the rotor assembly; and the detection magnetic ring is located at the end of the rotor assembly near the circuit board.

The assembly of the second pre-assembled component includes pressing the second bearing, the fixed gear ring, and the connecting seat together, such that at least a portion of the second bearing is located within a hole in the connecting seat, and one end of the fixed gear ring is limitedly connected to the connecting seat.

Assemble the first pre-assembly component, the second pre-assembly component, and the transmission components, including assembling the output shaft and the output stage planetary gear assembly, assembling the output stage planetary gear assembly, the second planetary gear assembly, the first planetary gear assembly, and the second pre-assembly component, such that the first planetary gear assembly, the second planetary gear assembly, and the output stage planetary gear assembly are at least partially built into the fixed gear ring, and the shaft is connected to the output shaft and can be driven by the output shaft; then assemble the first pre-assembly component and the second pre-assembly component, and fix the connection between the sleeve and the connecting seat by welding, such that the rotor, the connecting bracket, the shaft, and at least part of the transmission components are located in the space formed by the end cover, the sleeve, and the connecting seat, and the output shaft can drive the valve stem to rotate.

2. The manufacturing method according to claim 1, characterized in that the manufacturing method further includes the following step:

The assembly of component three includes the assembly of component two with the valve body assembly and valve core, the assembly of the valve body assembly with the valve core, the connection of component two with the valve core, and the fixed connection of component two with the valve body assembly.

Component 1 and Component 3 are connected by threads.

3. The manufacturing method as described in claim 1, characterized in that, in the assembly of component one, the step of pressing the assembled stator assembly into the housing of the control unit includes aligning the second communicating hole of the housing with the corresponding connecting hole of the stator assembly, and then passing the second screw through the connecting hole of the stator assembly and extending into the second communicating hole, and tightening it to connect the stator assembly with the housing.

The step of placing the circuit board inside the housing includes placing the circuit board in the first step of the housing, aligning the third connecting hole of the housing with the corresponding connecting hole of the circuit board, passing the third screw through the connecting hole of the circuit board and inserting it into the third connecting hole, and tightening it to connect the circuit board to the housing.

The steps for sealing the top cover to the housing include laser welding the top cover to the housing.

4. The manufacturing method as described in claim 3, characterized in that, before the assembled stator assembly is pressed into the housing, the method further includes placing the first sealing ring in the first sealing mounting groove at the bottom of the housing, and when the assembled stator assembly is pressed into the housing, the lower end face of the stator assembly abuts against the first sealing ring.

5. The manufacturing method as described in claim 2, characterized in that the assembly of component three further includes:

Assemble the second sealing ring with the valve body assembly such that the second sealing ring is located between the valve body and the connecting seat;

The stop block and spring are placed in the inner cavity formed by the output shaft. The stop block covers the end of the shaft located inside the output shaft. One end of the spring abuts against the stop block, and the other end of the spring abuts against the valve stem.

The assembly formed by component two, the stop block, and the spring is connected to the valve stem via the output shaft. The other end of the spring is placed in the fourth receiving cavity inside the valve stem, and the third flange of the connecting seat contacts the second sealing ring. By tightening the clamping nut, component two is connected to the valve body assembly.

6. The manufacturing method as described in claim 2, wherein the assembly of component three further includes:

Place the spring into the fourth receiving cavity of the valve stem, and place the stop block in the inner cavity of the output shaft and wrap around the end of the shaft.

The assembly formed by component two, the stop block, and the spring is connected to the valve stem via the output shaft. One end of the spring abuts against the stop block, and the other end of the spring is placed in the fourth receiving cavity inside the valve stem. The third flange of the connecting seat contacts the second sealing ring. By tightening the clamping nut, component two is connected to the valve body assembly.

7. The manufacturing method as described in claim 5 or 6, characterized in that the assembly of component three further includes:

Assemble the valve stem with the valve core, the fourth bearing, the third gasket, and the valve body assembly.

Assembling the valve stem and valve core, the fourth bearing, the third gasket, and the valve body assembly includes: assembling the fourth bearing with the valve body such that at least a portion of the fourth bearing is located in a hole in 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 such that the fourth bearing is fitted onto the radial outer periphery of the valve stem, and the third gasket is fitted onto the radial outer periphery of the valve stem and located between the valve stem and the fourth bearing, wherein the valve stem and valve core are connected by a plug-in connection.

8. The manufacturing method as described in claim 2, wherein the connection between component one and component three includes: pressing component one into component three from above, aligning the first connecting hole of the housing with the screw hole reserved in the valve body assembly and the positioning post, and connecting component one and component three by screwing in the first screw.

9. The manufacturing method as described in claim 1, wherein the assembly of the stator assembly comprises: integrally injection molding a skeleton with a claw pole plate and a first insert as inserts, then winding the coil winding around the skeleton, and then connecting the stator shell to the skeleton.