CN111237500A - Manufacturing method of valve component - Google Patents

Abstract

A manufacturing method of a valve component comprises the steps of fixedly connecting a valve core component with a valve body, fixedly connecting a lower shell with a component formed by assembling the valve core component with the valve body, placing a stator component in a cavity formed by a first stator containing part, limiting the stator component relative to the first stator containing part through the matching of a fixing frame and the first stator containing part, placing a circuit board in an inner cavity of a control box, and fixedly connecting an upper shell with the lower shell. Through mount and inferior valve body coupling, the casing is connected with the valve body down, and then is fixed in between mount and the lower casing with stator module, and stator module is fixed for the valve body like this, is favorable to simplifying the assembly process of positioning fixture and valve module simultaneously.

Description

Manufacturing method of valve component

[ technical field ] A method for producing a semiconductor device

The present invention relates to a method of manufacturing a valve assembly.

[ background of the invention ]

The refrigerating system utilizes the valve module to control the flow of the refrigerant, and achieves the control effect on the superheat degree of the system by adjusting the flow of the refrigerant, the valve module comprises a control part, a stator module, a valve core module and a valve body, and the fixation of the stator module relative to the valve body is a technical problem.

[ summary of the invention ]

The invention aims to provide a manufacturing method of a valve component, which is beneficial to realizing convenient and simple assembly and ensures the assembly reliability of a stator component relative to a valve body.

A method of manufacturing a valve assembly including a control part, a stator assembly, a valve body, and a spool assembly, the control part including a control box and a circuit board, the control box including an upper housing and a lower housing, the lower housing having a first stator receiving portion, the control box forming a control box inner cavity, the method comprising the steps of:

a1, fixedly connecting the valve core assembly with the valve body;

a2, fixedly connecting the lower shell with the assembly formed in the step a 1;

a3, placing the stator assembly in a cavity formed by the first stator accommodating part, and limiting the stator assembly relative to the first stator accommodating part through the matching of a fixing frame and the first stator accommodating part;

a4, placing the circuit board in the inner cavity of the control box;

a5, fixedly connecting the upper shell and the lower shell.

The technical scheme provides a manufacturing method of the valve component, which comprises the steps that the valve core component is arranged on a valve body, the valve core component is connected with a lower shell through a fixing frame, the lower shell is connected with the valve body, and then the stator component is fixed between the fixing frame and the lower shell, so that the stator component is fixed relative to the valve body, and meanwhile, the assembly process of the positioning clamp and the valve component is facilitated to be simplified.

[ description of the drawings ]

FIG. 1 is a front structural schematic view of an embodiment of the valve assembly of the present invention;

FIG. 2 is a schematic view of a first cross-sectional configuration of the valve assembly of FIG. 1;

FIG. 3 is a second cross-sectional structural schematic view of the valve assembly of FIG. 1;

FIG. 4 is a third cross-sectional structural view of the valve assembly of FIG. 1;

FIG. 5 is a schematic perspective view of one orientation of the valve assembly of FIG. 1;

FIG. 6 is a schematic perspective view of the valve assembly of FIG. 1 in another orientation;

FIG. 7 is a schematic perspective view of one direction of the valve body of FIG. 1;

FIG. 8 is a schematic top view of the lower housing of FIG. 2;

FIG. 9 is a perspective view of the lower housing of FIG. 2 with the side walls broken away in one direction;

FIG. 10 is a front view of the holder of FIG. 2;

FIG. 11 is a perspective view of the holder of FIG. 2 in one direction;

FIG. 12 is a perspective view of one direction of the stator assembly of FIG. 2;

FIG. 13 is a schematic top view of the valve assembly of FIG. 2 with the upper housing removed;

FIG. 14 is a perspective view of the valve assembly of FIG. 2 with the upper housing, circuit board removed and the lower housing wall cut away;

FIG. 15 is a schematic perspective view of one direction of the circuit board of FIG. 2;

FIG. 16 is a first schematic illustration of the assembly process of the valve assembly of FIG. 2;

FIG. 17 is a second schematic assembly process for the valve assembly of FIG. 2;

fig. 18 is a third schematic assembly process for the valve assembly of fig. 2.

[ detailed description ] embodiments

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

referring to fig. 1 and 2, the valve assembly 100 includes a control portion 1, a stator assembly 2, a valve body 3, a valve core assembly 4, and a sensor 5, the control portion 1 includes a control box 11 and a circuit board 12, the stator assembly 2 is electrically connected to the circuit board, and the sensor 5 is electrically connected to the circuit board 12. The valve core assembly 4 is fixedly connected with the valve body 3, in this embodiment, the valve core assembly 4 is fixedly connected with the valve body through the first compression nut 101, and of course, the valve core assembly 4 can also be directly fixedly connected with the valve body 3 or fixedly connected through other forms; the sensor 5 is fixedly connected with the valve body 3, in this embodiment, the sensor 5 is fixedly connected with the valve body 3 through the second compression nut 102, and of course, the sensor 5 can also be directly fixedly connected with the valve body 3 or fixedly connected with the valve body 3 through other forms; the control part 1 is fixedly connected to the valve body 3, and in this embodiment, the control part 1 is fixedly connected to the valve body 3 by a screw assembly 6, but the control part 1 may be fixed by a snap fit or an adhesive. The control box 11 forms a control box inner cavity 10, the stator assembly 2 is located in the control box inner cavity, the circuit board 12 is located in the control box inner cavity 10, part of the sensor 5 is located in the control box inner cavity 10, part of the screw assembly 6 is located in the control box inner cavity 10, in the embodiment, the valve assembly 100 includes the sensor 5, but the valve assembly 100 may have no sensor 5. The arrangement is beneficial to the compact structure of the valve component, so that the valve component is miniaturized as a whole.

With reference to fig. 3, 4, 5, 6 and 7, the valve body 3 includes a first inlet 31, a first outlet 33, a first channel 35 and a first mounting portion 36, the valve core assembly 4 is fixedly connected to the first mounting portion 36, the first mounting portion 36 has a first cavity 360, the valve core assembly 4 is at least partially disposed in the first cavity 360, the first cavity 360 is communicated with the first channel 35, the first channel 35 is formed between the first inlet 31 and the first outlet 33, the valve body 3 further includes a second inlet 32, a second outlet 34, a second channel 37 and a second mounting portion 38, the sensor 5 is fixedly connected to the second mounting portion 38, the second mounting portion 38 has a second cavity 380, the second cavity 380 is communicated with the second channel 37, the second channel 37 is formed between the second inlet 32 and the second outlet 34, and the first channel 35 is not communicated with the second channel 37. The first inlet 31 and the second outlet 34 are located on the same side of the valve body 3, the second inlet 32 and the first outlet 33 are located on the same side of the valve body 3, the opening of the first cavity 360 and the opening of the second cavity 380 are located on the same side of the valve body 20, and the three sides are different sides of the valve body, so that interference is avoided, miniaturization of the valve body is facilitated, and the utilization rate of the valve body is improved.

With reference to fig. 2, 3 and 7, the valve assembly 100 further includes a first gland nut 101 and a second seal 1002, the second seal 1002 is disposed in the first chamber 360, the valve core assembly 4 is disposed in the first mounting portion 36 of the valve body 3, and the second seal 1002 is pressed and deformed by the valve core assembly 4 and the valve body 3. The first compression nut 101 is sleeved on the outer periphery of the valve core assembly 4 and is in threaded connection with the threaded portion 361 of the first mounting portion 36 of the valve body 3, and the first compression nut 101 at least limits the movement of the valve core assembly 4 relative to the valve body 3 along the axial direction of the valve core assembly 4. The valve core assembly 4 comprises a valve seat 41, a valve core 42, a rotor assembly 43, a connecting piece 44 and a sleeve 45, wherein the valve seat 41 is fixedly arranged relative to the valve body 3, the rotor assembly 43 and the valve core 42 are assembled inside the sleeve 45, the sleeve 45 and the connecting piece 44 are welded and fixed, the valve seat 41 is provided with a valve port 441, the valve core 42 moves relative to the valve seat 41 and controls the opening degree of the valve port 411, and the control part 1 controls the valve core 42 to move by controlling the stator assembly 2 and the rotor assembly. This is advantageous in simplifying the positioning jig and valve assembly process.

Referring to fig. 4, 7 and 15, the sensor 5 includes a sensing head 51, a body 52 and a third pin 53, the sensing head 51 is fixedly disposed on the body 52, the third pin 53 is disposed at an end exposed from the body, the third pin 53 is inserted into a third pin hole 123 formed on the circuit board 12, and the third pin 123 is fixedly soldered to the circuit board 12, so that the circuit board 12 is electrically connected to the sensor 5, although the sensor 5 and the circuit board 12 may also be connected by signals; the other end of the sensing head 51 exposed out of the body is provided, and the sensing head 51 is located in the second channel 37 or the second cavity 380 directly communicated with the second channel 37. Wherein the sensor 5 is a temperature sensor and/or a pressure sensor such that the sensor 5 can detect the temperature or pressure or the temperature and/or pressure of the refrigerant or working medium in the second channel 37 and/or the second chamber 380. One end of the body 51 is arranged in the control box inner cavity 10 through the third through hole 113, the other end of the body 51 is fixedly connected with the valve body 3 through the third through hole 113, specifically, the valve assembly 100 comprises a second compression nut 102 and a third sealing member 1003, the third sealing member 1003 is arranged in the second cavity 380, the sensor 5 is arranged on the second mounting portion 38 of the valve body, the sensor 5 is at least partially arranged in the second cavity 380, the third sealing member 1003 is extruded and deformed by the sensor 5 and the valve body 3, the second compression nut 102 is sleeved on the periphery of the sensor 5 and is in threaded connection with a threaded portion 381 formed on the second mounting portion 38, and the second compression nut 102 at least limits the axial movement of the sensor 5 relative to the valve body 3 along the sensor 5.

Referring to fig. 2, 8 and 9, the control box 11 includes an upper housing 111 and a lower housing 112, and the lower housing 112 is fixedly coupled to the valve body 3. The lower shell comprises a bottom 1121 and a first side wall portion 1122, the bottom 1121 is connected with the valve body 3 in a sealing manner, the first side wall portion 1122 is connected with the upper shell 111 in a sealing manner, in the embodiment, the upper shell 111 and the lower shell 112 are formed separately, the first side wall portion 1122 and the upper shell 111 are welded through ultrasonic welding or laser welding, and the upper shell 111 and the lower shell 112 are welded to form the control box inner cavity 10; referring to fig. 9, 13 and 14, the lower housing has a third through hole 113, a fourth through hole 117 and screw holes 114 with the number greater than or equal to 1, the third through hole 113, the fourth through hole 117 and the screw holes 114 are formed at the inner side of the bottom 1121 of the lower housing, and the valve core assembly 4 passes through the fourth through hole 114 and is fixedly connected with the valve body; one end of the sensor 5 penetrates through the third through hole 113 to be electrically connected with the circuit board 12, and the other end of the sensor 5 penetrates through the third through hole 113 to be fixedly connected with the valve body 3; screw holes 114 are disposed on both sides of the third through hole 113, and the valve assembly 100 further includes a screw assembly 6, the screw assembly 6 being screwed through the first screw hole 114 with a second screw hole 39 formed on the valve body 3 so that the control portion 1 is fixed with respect to the valve body 3; the lower housing 112 has an annular groove 115, the annular groove 115 is formed outside the lower housing bottom 1121, while the annular groove 115 is disposed around the third through hole 113, the fourth through hole 117 and the screw hole 114, the valve assembly 100 further includes a first seal member 1001, the first seal member 1001 is disposed in the annular groove 115, and the first seal member 1001 is pressed and deformed by the control box 11 and the valve body 3, so that the first seal member 1001 prevents the external fluid medium from entering the control box inner chamber 10, and further, the annular groove 115 may be formed on a side of the valve body 3 that is fitted to the control box 11. Therefore, the circuit board 12, the stator assembly 2 and the sensor 5 are integrally coated in the control box inner cavity 10, meanwhile, the control box 11 and the valve body 3 enable sensitive electrical elements to be prevented from losing efficacy due to contact with an external fluid medium by extruding the first sealing member 1001, the service life of the valve assembly 100 is prolonged, and the screw assembly 6 for connecting the control box 11 and the valve body 3 is packaged in the control box inner cavity 10, so that the valve assembly 100 is more compact in appearance.

Referring to fig. 2, 9 and 14, the control box 11 has a first stator accommodating portion 116, the first stator accommodating portion 116 is formed by protruding from the bottom portion 1121, the protruding direction of the first stator accommodating portion 116 is the same as the extending direction of the first side wall portion 1122 of the lower housing 112, at least a portion of the stator assembly 4 is located in the inner cavity formed by the first stator accommodating portion 116, the valve assembly 100 further includes a fixing frame 7, the fixing frame 7 is connected to the lower housing 112, where the connection may be a direct connection, such as the fixing frame 7 is snapped into the first stator accommodating portion 1161; an indirect connection is also possible, such as a fixed connection of the fastening frame 7 to the lower housing 112 by means of a separate second connecting element, which is not separately illustrated here, the stator assembly 2 being retained relative to the control box 11 by means of the fastening frame 7. The first stator receiving portion 116 is integrally injection-molded with the lower housing 112, and specifically, the first stator receiving portion 116 is injection-molded on the lower housing 112 in this embodiment. Referring to fig. 9 and 12, the stator assembly 2 has a stator housing 23, the stator housing 23 is formed with a sixth side wall 231, the inner cavity formed by the first stator receiving portion 116 has a first inner wall 1161, the sixth side wall 231 is in small clearance fit with the first inner wall 1161, here, the diameter of the sixth side wall 231 is 35.5 ± 0.02mm, the diameter of the first inner wall 1161 is 36 ± 0.02mm, and the clearance between the sixth side wall 231 and the first inner wall 1161 is in the range of 0.23-0.27, i.e. the sixth side wall 231 is in small clearance fit with the first inner wall 1161. An inner cavity formed by the first stator housing part 116 is defined as a stator housing cavity 1162, and the first stator housing part 116 limits a radial movement range of the stator assembly 2 to the stator housing cavity 1162. The radial diameter of the first inner wall 1161 here ranges from 35.48mm to 35.52mm, i.e. the radial movement of the stator assembly 2 ranges from 35.48mm to 35.52 mm. In this embodiment, the stator housing 23 does not include an injection molding part, which is beneficial to reducing the size and weight, and the stator assembly 2 is clamped with the first stator accommodating part 116 through the fixing frame 7 for limiting, so that the stator assembly 2 is more reliably assembled relative to the valve body 3.

Referring to fig. 9, the first stator receiving portion 116 further includes a first body portion 1163, a first locking portion 1164 and a gap 1166, the first locking portion 1164 includes a first protrusion portion 1165, the first locking portion 1164 is located at the periphery of the first body portion 1163, and the gap 1166 is formed between the first locking portions 1164. It should be noted that the first stator accommodating portion 116 has not only one first locking portion 1164, but in the present embodiment, the first stator accommodating portion 116 has four first locking portions 1164. Referring to fig. 10, 11 and 14, the valve assembly 100 includes a fixing frame 7, the fixing frame 7 includes a second main body portion 71, a second locking portion 72 and a second side wall portion 76, the second side wall portion 76 protrudes in the same direction as the second main body portion 71 extends axially, the second locking portion 72 is located at the periphery of the second side wall portion 76, and similarly, the fixing frame 7 should not have only one second locking portion 72, and in this embodiment, there are a number of second locking portions 72 corresponding to the number of first locking portions 1164. The second locking portion 72 includes a locking hole 721, the first protrusion 1165 can be inserted into the locking hole 721, and the fixing frame 7 and the first stator receiving portion 116 are clamped with the locking hole 721 by the first protrusion 1165. Further, the holder 7 has a second projection 77, the second projection 77 extends in the axial direction of the second body portion 71, the second projection 77 is inserted into the notch 1166, the second projection 77 has a third side wall portion 771, the notch 1166 has a second inner wall portion 1167, the third side wall portion 771 is fitted with a small clearance with the second inner wall portion 1167, and a range of rotation of the holder 7 in the circumferential direction of the first body portion 1163 is defined between adjacent two second inner wall portions 1167. Here, the distance between the two second inner wall portions 1167 of the notch 1166 is 15.6 ± 0.05mm, the distance between the two third side wall portions 771 of the second projection 77 is 15.5 ± 0.05mm, and the third side wall portions 771 are considered to be in small clearance fit with the second inner wall portions 1167 within a range of 0 to 0.325. The close clearance fit between the second protruding portion 77 and the third side wall portion 771 strengthens the limit function of the fixing frame 7 relative to the first stator accommodating portion 116, and ensures the reliability of the assembly of the fixing frame 7.

With reference to fig. 2, 11 and 14, the fixing frame 7 is locked and connected to the lower housing 112 by the first locking portion 1164 and the second locking portion 72, the stator assembly 2 is located between the fixing frame 7 and the lower housing 112, in this embodiment, one end of the stator assembly 2 abuts against the inside of the second main body portion 71, the other end of the stator assembly 2 abuts against the bottom portion 1121 of the lower housing 112, and the fixing frame 7 prevents the stator assembly 2 from moving in the axial direction of the valve core assembly 4 relative to the lower housing 112. In the radial direction, the stator assembly 2 enters the control box inner chamber 10 through the notch 1166 provided on the first stator receiving portion 116. Like this stator module 2 comes spacingly through mount 7 and the cooperation of control box 11, and spacing mode is more reliable, and mount and control box assembly and/or dismantlement are convenient, simple, and when mount and stator module go wrong, be convenient for change mount or stator module, have improved valve module's performance.

With reference to fig. 2, 12 and 14, the stator assembly 2 includes a coil 22, a stator housing 23, a pin holder 24 and a first pin 25, the coil 22 is disposed in the stator housing 23, the pin holder 24 extends to the control box inner cavity 10 through a notch 1166 along a radial direction of the stator assembly 2, the pin holder 24 has a fourth side wall portion 241, the notch 1166 has a second inner wall portion 1167, the fourth side wall portion 241 is in small clearance fit with the second inner wall portion 1167, and a circumferential movable range of the pin holder 24 along the first body portion 1163 is defined between two adjacent second inner wall portions 1167. Here, the distance between the two second inner wall portions 1167 of the notch 1166 is 15.6 ± 0.05mm, the distance between the two fourth side wall portions 241 of the socket 24 is 14.95 ± 0.05mm, and the gap between the fourth side wall portion 241 and the second inner wall portion 1167 is in the range of 0.275-0.35, i.e., the fourth side wall portion 241 and the second inner wall portion 1167 are considered to be in small-gap fit. Referring to fig. 15, the pin holder 24 includes a fourth pin hole 242, one end of the first pin 25 is inserted into the fourth pin hole 242, the other end is inserted into the first pin hole 121 formed on the circuit board 12, and the first pin 25 is welded to the circuit board 12, so that the stator assembly 2 is electrically connected to the circuit board 12, although the stator assembly 2 and the circuit board 12 may be connected by signals.

Referring to fig. 2, 11 and 12, the fixing frame 7 has a first through hole 73, the first through hole 73 is coaxial with the fixing frame 7, the stator assembly 2 is formed with a second through hole 21, and the valve core assembly 4 is fixed to the valve body 3 through the first through hole 73 and the second through hole 21. Further, the holder 7 has an open groove 74, the open groove 74 being formed on the outer peripheral side near the first through hole 73, and communicating with the first through hole 73; the valve assembly 100 further includes a hall element 8, the hall element 8 being disposed in the open groove 74, the hall element 8 being fixedly connected with respect to the holder 7. The hall element 8 is electrically connected to the circuit board 12, and in the present embodiment, the hall element 8 is electrically connected to the circuit board 12 through a wire, and the wire connecting the hall element 8 to the circuit board 12 is not shown in the figure. The hall element 8 is used for monitoring the rotating speed of the rotor assembly 43 in the valve assembly 100, and then transmitting a rotating speed signal to the system ECU, and the ECU monitors the opening condition of the valve port through the rotating speed signal.

Fig. 16-18 are schematic diagrams illustrating a manufacturing process of the valve assembly, and a manufacturing method of the valve assembly 100 is further described with reference to the schematic diagrams of fig. 1-15. The valve assembly 100 includes a control portion 1, a stator assembly 2, a valve body 3, and a spool assembly 4. The method of assembling the valve assembly 100 includes the steps of:

a1, fixedly connecting the valve core assembly 4 with the valve body 3;

a2, fixedly connecting the lower shell 112 with the assembly formed in the step a 1;

a3, placing the stator assembly 2 in a cavity formed by the first stator accommodating part 116, and limiting the stator assembly 2 relative to the first stator accommodating part 116 through the matching of the fixed frame 7 and the first stator accommodating part 116;

a4, placing the circuit board 12 in the inner cavity 10 of the control box;

a5, fixedly connecting the upper shell 111 and the lower shell 112.

Step a1 includes: placing a second seal 1002 in a first cavity 360 formed in a first mounting portion of the valve body 3; placing the valve core assembly 4 on the first mounting portion 36 of the valve body 3, placing at least part of the valve core assembly 4 in the first cavity 360, and extruding and deforming the second sealing member by the valve core assembly and the valve body 3; the first compression nut 101 is sleeved on the outer periphery of the valve core assembly 4, the first compression nut 101 is in threaded connection with the threaded portion 361 of the first mounting portion 36 of the valve body 3, and the first compression nut 101 at least limits the axial movement of the valve core assembly 4 relative to the valve body 3 along the valve core assembly 4. Before the step a1, the method further includes assembling the valve core assembly 4, where the valve core assembly 4 includes the valve seat 41, the valve core 42, the rotor assembly 43, the connector 44 and the sleeve 45, the rotor assembly 43 and the valve core 42 are assembled inside the sleeve 45, the sleeve 45 and the connector 44 are welded and fixed, and the valve seat 41 and the connector 44 are welded and fixed.

Step a2 is preceded by: placing a third seal 1003 within a second chamber 380 formed in the second mounting portion of the valve body; mounting the sensor on the second mounting part 38 of the valve body 3, placing the sensor 5 at least partially in a second cavity 380 formed by the second mounting part 38, and pressing and deforming the third sealing member 1003 and the valve body 3 by the sensor 5; the second compression nut 102 is fitted around the outer periphery of the sensor 5, and the second compression nut 102 is screwed with the threaded portion 381 of the second mounting portion 38 of the valve body 3, the second compression nut 102 restricting at least the sensor 5 from moving in the axial direction of the sensor 5 relative to the valve body 3.

Step a2 includes: placing a first seal 1001 in an annular groove 115 formed in the valve body 3 or the control portion 1; the screw assembly 6 is inserted into the first screw hole 114 of the control portion 1 and the second screw hole 39 of the valve body 3, and the control portion 1 and the valve body 3 are fixedly connected by the screw assembly 6.

Step a4 includes: electrically connecting the circuit board 12 with the stator assembly 2, wherein the stator assembly 2 is provided with a first pin 25, inserting the first pin 25 into a first pin hole 121 formed on the circuit board 12, and then welding and fixing the first pin 25 and the circuit board 12; electrically connecting the circuit board 12 with a second pin 13 injected on the control box 11, inserting the second pin 13 into a second pin 122 hole formed on the circuit board 12, then welding and fixing the second pin 13 with the circuit board 12, and connecting the circuit board 12 with an external power supply through the second pin 13; in addition, the circuit board 12 is electrically connected to the sensor 5, the sensor 5 has a third pin 53, the third pin 53 is inserted into a third pin hole 123 formed in the circuit board 12, and the third pin 53 is soldered to the circuit board 12. Through with contact pin and circuit board welded fastening, be favorable to guaranteeing assembly connection's reliability.

Before step a5, the method includes that the Hall element 8 is placed in an opening groove 74 formed in the fixed frame 7, the Hall element 8 is fixedly connected relative to the fixed frame 7, and the Hall element 8 is electrically connected with the circuit board 12; the upper case 111 and the lower case 112 are fixed by welding in step a 5.

The valve assembly manufactured in the way has larger freedom of design of an assembly process because the assembly steps of the valve core assembly and the sensor are not limited.

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 (10)

1. A method of manufacturing a valve assembly including a control part, a stator assembly, a valve body, and a spool assembly, the control part including a control box and a circuit board, the control box including an upper housing and a lower housing, the lower housing having a first stator receiving portion, the control box forming a control box inner cavity, the method comprising the steps of:

a1, fixedly connecting the valve core assembly with the valve body;

a2, fixedly connecting the lower shell with the assembly formed in the step a 1;

a3, placing the stator assembly in a cavity formed by the first stator accommodating part, and limiting the stator assembly relative to the first stator accommodating part through the matching of a fixing frame and the first stator accommodating part;

a4, placing the circuit board in the inner cavity of the control box;

a5, fixedly connecting the upper shell and the lower shell.

2. The manufacturing method according to claim 1, characterized in that: the valve assembly includes a first sealing member and a screw assembly, and step a2 includes placing the first sealing member in an annular groove formed in the control portion or the valve body, and fixedly connecting the control portion to the valve body via the screw assembly.

3. The manufacturing method according to claim 1, characterized in that: the first stator accommodating part further comprises a first main body part and a first locking part, the first locking part is positioned at the periphery of the first main body part, and the first locking part comprises a first protruding part; the mount includes second main part, second lateral wall portion and second locking portion, second lateral wall portion follows the axial extension of mount, second locking portion includes the locking hole, first bellying can insert the locking hole, the mount with first stator receiving portion passes through first bellying with the locking hole joint.

4. The manufacturing method according to claim 2 or 3, characterized in that: the valve component comprises a second sealing element and a first compression nut, the step a1 includes that the second sealing element is arranged in a first cavity formed by a first installation part of the valve body, the valve core component is arranged in the first installation part of the valve body, the first compression nut is sleeved on the periphery of the valve core component and is in threaded connection with a threaded part of the first installation part of the valve body, and the second sealing element is extruded and deformed by the valve core component and the valve body.

5. The manufacturing method according to claim 4, characterized in that: the valve assembly further comprises a sensor, a second compression nut and a third sealing element, wherein the step a2 is preceded by placing the third sealing element in a second cavity formed in a second mounting part of the valve body, mounting the sensor on the second mounting part of the valve body, placing the sensor at least partially in the second cavity, sleeving the second compression nut on the outer periphery of the sensor, and screwing the second compression nut and the threaded part of the second mounting part of the valve body, wherein the third sealing element is pressed and deformed by the sensor and the valve body, and the sensor can detect the temperature and/or the pressure of the working medium in the second cavity.

6. The manufacturing method according to claim 2 or 3, characterized in that: before the step a1, the method further comprises assembling the valve core assembly, wherein the valve core assembly comprises a valve core, a valve seat, a connecting piece, a sleeve and a rotor assembly, the rotor assembly and the valve core assembly are arranged on the inner side of the sleeve, the sleeve and the connecting piece are welded and fixed, and the valve seat and the connecting piece are welded and fixed.

7. The manufacturing method according to claim 5, characterized in that: the step a4 further includes electrically connecting the circuit board with the stator assembly, where the stator assembly has a first pin, and the first pin is inserted into a first pin hole formed on the circuit board, and the first pin is soldered to the circuit board.

8. The manufacturing method according to claim 7, characterized in that: the step a4 further includes that the circuit board is electrically connected with a second pin injection-molded on the control box, the second pin is inserted into a second pin hole formed on the circuit board, the second pin is then welded and fixed with the circuit board, and the circuit board is connected with an external power supply through the second pin.

9. The manufacturing method according to claim 8, characterized in that: step a4 includes electrically connecting the circuit board with the sensor, wherein the sensor has a third pin, inserting the third pin into a third pin hole formed on the circuit board, and then soldering the third pin to the circuit board.

10. The manufacturing method according to any one of claims 1 to 9, characterized in that: the valve assembly further comprises a Hall element, before the step a5, the Hall element is placed in an opening groove formed in the fixed frame, the Hall element is fixedly connected relative to the fixed frame, and the Hall element is electrically connected with the circuit board; the upper case and the lower case are fixed by welding in step a 5.

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