CN113007418A

CN113007418A - Electronic expansion valve

Info

Publication number: CN113007418A
Application number: CN202010216930.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2019-12-20
Filing date: 2020-03-25
Publication date: 2021-06-22

Abstract

The utility model provides an electronic expansion valve, including drive assembly, the case part, holding chamber and first installation cavity, the case part is connected with drive assembly, motor element includes stator module, place motor element and sealed setting in the stator module, motor element is located the holding chamber, part case part is located first installation cavity, part case part is located the holding chamber, communicate through the balancing hole between first installation cavity and the holding chamber, thus, electronic expansion valve is at the during operation, the working medium can get into the holding chamber from first installation cavity through the balancing hole, the working medium can contact with motor element's periphery, under the effect of working medium, be favorable to improving motor element's heat dissipation, and then be favorable to improving stator module's heat dissipation.

Description

Electronic expansion valve

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of fluid control components, in particular to an electronic expansion valve.

[ background of the invention ]

In an automobile air conditioning system, in order to improve the flow control precision of a working medium, an electronic expansion valve is adopted as a throttling element, the inventor knows that a stator assembly and a rotor assembly of the electronic expansion valve are separately arranged, when the electronic expansion valve works, the heat dissipation problem of the stator assembly is involved, and how to improve the heat dissipation of the stator assembly is a technical problem.

[ summary of the invention ]

The invention aims to provide an electronic expansion valve which is beneficial to improving the heat dissipation of a stator assembly.

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

the utility model provides an electronic expansion valve, includes drive assembly and case part, the case part with drive assembly connects, electronic expansion valve includes holding chamber and first installation cavity, drive assembly includes motor element, motor element includes stator module, place in the stator module motor element sets up in sealed, the case part includes balancing hole, part the case part is located first installation cavity, at least part motor element is located the holding chamber, the balancing hole intercommunication first installation cavity with the holding chamber.

The invention provides an electronic expansion valve which comprises a driving part, a valve core part, an accommodating cavity and a first mounting cavity, wherein the valve core part is connected with the driving part, the motor component comprises a stator component, the stator component is arranged in a motor component and is arranged in a sealing mode, the motor component is positioned in the accommodating cavity, part of the valve core part is positioned in the first mounting cavity, part of the valve core part is positioned in the accommodating cavity, and the first mounting cavity and the accommodating cavity are communicated through a balance hole.

[ description of the drawings ]

FIG. 1 is a schematic cross-sectional view of a first embodiment of an electronic expansion valve;

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

FIG. 3 is a perspective view of the terminal post of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the post of FIG. 3;

FIG. 5 is a perspective view of the housing of FIG. 1;

FIG. 6 is a cross-sectional structural view of the enclosure of FIG. 5;

FIG. 7 is a schematic perspective view of the housing of FIG. 1 in another orientation;

FIG. 8 is a perspective view of the motor assembly of FIG. 1;

FIG. 9 is a cross-sectional structural schematic of the motor assembly of FIG. 8;

FIG. 10 is a perspective view of the connector of FIG. 1;

FIG. 11 is a cross-sectional structural view of the connector of FIG. 10;

FIG. 12 is a perspective view of the valve spool assembly of FIG. 1;

FIG. 13 is a cross-sectional structural schematic of the valve core assembly of FIG. 12;

FIG. 14 is a cross-sectional structural view of the valve seat of FIG. 1;

FIG. 15 is an enlarged partial cross-sectional structural view of the electronic expansion valve of FIG. 1;

fig. 16 is a schematic cross-sectional view of a second embodiment of an electronic expansion valve;

FIG. 17 is a perspective view of the connector of FIG. 16;

FIG. 18 is a cross-sectional structural view of the connector of FIG. 17;

FIG. 19 is an enlarged partial cross-sectional structural view of the electronic expansion valve of FIG. 16;

fig. 20 is a schematic cross-sectional view of a third embodiment of an electronic expansion valve;

FIG. 21 is a cross-sectional view of the shroud and post combination of FIG. 20.

[ detailed description ] embodiments

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

referring to fig. 1, the electronic expansion valve 100 includes a control component 1, a driving component 2, a valve core component 3 and a valve seat 4, wherein the control component 1 is connected with the driving component 2 and can be electrically and/or signal connected, the driving component 2 is connected with the valve seat 4, at least a part of the valve core component 3 is located in a first installation cavity formed by the valve seat 4, and the valve core component 3 is connected with the driving component 2.

Referring to fig. 1, the control component 1 includes an outer shell 11, a circuit board 12 and a cover plate 13, the outer shell 11 and the cover plate 13 are respectively injection-molded and fixedly connected, a first accommodating cavity 111 is formed between the outer shell 11 or the outer shell 11 and the cover plate 13, and the circuit board 12 is located in the first accommodating cavity 111; the control component 1 further comprises a first interface part 14 and a second contact pin 15, the first interface part 14 and the outer shell 11 are integrally formed through injection molding, the first interface part 14 forms a second containing cavity 141, the middle part of the second contact pin 15 is fixed with the outer shell 11 through injection molding, one end of the second contact pin 15 is located in the first containing cavity 111 and is electrically connected and/or signal connected with the circuit board 12, and the other end of the second contact pin 15 is located in the second containing cavity 141 and is electrically connected and/or signal connected with the outside. Referring to fig. 2, the outer case 11 further includes a second mounting portion 112, the second mounting portion 112 forming a second mounting cavity 113, the second mounting cavity 113 being disposed in communication with the first accommodating cavity 111, the second mounting portion 112 including a second stepped portion 114 and a third stepped portion 115, the third stepped portion 115 being disposed closer to the first accommodating cavity 111 than the second stepped portion 114.

Referring to fig. 1, the driving part 2 includes a terminal post 21, a housing 22, a motor assembly 23, and a compression nut 24. The motor assembly 23 is positioned in the housing 22, one end of the terminal 21 abuts against the housing 22, and the terminal 21 is in threaded connection with the compression nut 24. Referring to fig. 3 and 4, the terminal 21 includes a cylinder 211, a first pin 212 and a glass sintered body 213, the cylinder 211 and the first pin 212 are used as inserts and sintered to form the glass sintered body 213, so that the cylinder 211, the first pin 212 and the glass sintered body 213 are connected into a whole, the glass sintered body 213 has a better pressure-bearing capacity and a good sealing performance, and the glass sintered body 213 enables the terminal 21 to better bear the pressure of a working medium and is beneficial to preventing the working medium from entering the first accommodating cavity 111 through the terminal 21 to damage the circuit board 12. The cylinder 211 comprises a first side portion 2111, a first flange portion 2112, a first positioning surface 2113 and a positioning hole 2114, wherein an external thread is formed on the outer peripheral surface of the first side portion 2111, the first positioning surface 2113 is a plane, the first flange portion 2112 is recessed inwards to form a first sealing groove 2115 along the axial direction of the cylinder 211, the first sealing groove 2115 forms a first groove cavity, and two ends of the first pin 212 extend out of the cylinder 211.

Referring to fig. 1, a cover 22 is disposed at the outer periphery of a motor assembly 23, one end of the cover 22 is fixedly connected to the control part 1, and the other end of the cover 22 is fixedly connected to the valve seat 4. Specifically, referring to fig. 5 and 6, the housing 22 includes a first end portion 221, the first end portion 221 is provided with a first through hole 222, the housing 22 forms a receiving cavity 223, the first through hole 222 is provided to communicate with the receiving cavity 223, and a side wall surface forming the first through hole 222 has a first mating surface 224. Referring to fig. 1, the first end 221 of the cover 22 is located in the second mounting cavity 113, and the first end 221 abuts against the second stepped portion 114; the partial terminal 21 is located in the housing cavity 223 of the housing 22, and the partial terminal 21 located in the housing cavity 223 abuts against the inside of the first end 221 through the first flange portion 2112; part of the terminal post 21 passes through the first through hole 222 and the first end 221 and is located in the first accommodating cavity 111, and at least part of the first side 2111 of the terminal post 21 is located in the first accommodating cavity 111; the first matching surface 224 is attached to the first positioning surface 2213, and is used for positioning and/or rotationally limiting the terminal 21; the compression nut 24 is located in the first accommodating cavity 111, the compression nut 24 is sleeved on the radial periphery of the first side portion 2111, an inner peripheral surface of the compression nut 24 is provided with an internal thread matched with the external thread of the first side portion 2111, the compression nut 24 is rotated to enable the compression nut 24 to be in threaded fit with the first side portion 2221, and the compression nut 24 and the first flange portion 2112 press the first end portion 221 of the housing 22 and the outer shell 11, so that the housing 22 is fixedly connected with the control component 1. Further, sealing arrangements can be further performed between the outer shell 11 and the cover case 22 and between the terminal 21 and the cover case 22, specifically, referring to fig. 1, the electronic expansion valve 100 includes a first sealing ring 5 and a second sealing ring 6, a part of the first sealing ring 5 is located in the first groove cavity and abuts against the first sealing groove 2115 and the first end 221, and the lower side surface of the first end 221 and the first sealing groove 2115 press the first sealing ring 5 to be in an elastic deformation state; the second gasket 6 is located between the third step portion 115 and the upper side surface of the first end portion 221, and the third step portion 115 and the first end portion 221 press the second gasket 6 to be in an elastic deformation state. The provision of the first seal ring 5 facilitates the prevention of the working medium from leaking out from the gap between the first end 221 of the housing 22 and the post 21; the provision of the second sealing ring 6 is advantageous to prevent moisture in the external environment from entering the first accommodating chamber 111 through the gap between the first end 221 of the casing 22 and the outer housing 11, and damaging the circuit board 11. The other end of the cover 22 is fixedly connected to the valve seat 4 by a screw. Of course, as another embodiment, the cover 22 and the control component 1 may be integrally injection molded, specifically, the cover 22 and the outer housing 11 are integrally injection molded, and the other end of the cover 22 is fixedly connected to the valve seat 4 by a screw. Referring to fig. 7, the housing 22 further includes a first stepped portion 225, and the first stepped portion 225 is provided with first positioning grooves 2251 recessed inward in an axial direction of the housing 22, where the number of the first positioning grooves 2251 is at least 1, and in this embodiment, the number of the first positioning grooves 2251 is two and is symmetrically arranged.

Referring to fig. 8 and 9, the motor assembly 23 includes an electrical connection 231, a motor housing 232, a stator assembly 233, a rotor assembly 234, and a valve stem 235, wherein the valve stem 235 is fixedly connected with the rotor assembly 234, and in the present embodiment, the valve stem 235 is fixed with the rotor assembly 234 by interference fit. The stator assembly 233 is located at the outer periphery of the rotor assembly 234, the motor housing 232 is located at the outer periphery of the stator assembly 233, the motor housing 232 is fixedly connected with the electric connection portion 231, and in the present embodiment, the motor housing 232 and the electric connection portion 231 are fixed by crimping. The motor housing 232 and the electrical connection 231 together enclose the stator assembly 233 and the rotor assembly 234 and provide a seal between the stator assembly 233 and the rotor assembly 234, which is advantageous for preventing the motor assembly 23 from being damaged by the infiltration of working medium. One end of the valve rod 235 is located in a closed space formed by the motor housing 232 and the electric connection portion 231 and is abutted to the electric connection portion 231, the other end of the valve rod 235 is located outside the motor housing 232, and an external thread is arranged at one end of the valve rod 235 located outside the motor housing 232. The electrical connection portions 231 include patch holes 2311 and first protrusions 2312, and the number of patch holes 2311 is the same as the number of first pins 212. The motor assembly 23 further includes a connecting plate 236, and the connecting plate 236 is fixedly connected to the motor housing 232, in this embodiment, the connecting plate 236 is fixedly connected to the motor housing 232 by riveting. The radial diameter of connecting plate 236 is greater than motor housing 232's radial diameter, and along motor element 23's radial direction, connecting plate 236 protrusion motor housing 232 sets up, and connecting plate 236 is including the portion 2361 of bending, and the portion 2361 of bending is the same with first locating slot 2221's quantity, and the portion 2361 symmetry of bending sets up, and the portion 2361 of bending is used for coordinating the location with first locating slot 2251.

Referring to fig. 1, a part of the motor assembly 23 is located in the accommodating cavity 223, the first protrusion 2312 of the electrical connection portion 231 is located in cooperation with the locating hole 2114 of the terminal 21, the connection plate 236 abuts against the first step portion 225, the bending portion 2361 is buckled into the first locating groove 2251, and the bending portion 2361 is located in cooperation with the first locating groove 2251. The first pin 212 is located at one end of the accommodating cavity 223, is fixedly inserted into the plug hole 2311 of the electrical connection portion 231, and can be electrically connected and/or signal connected with the stator assembly 233, and the first pin 212 is located at the other end of the first accommodating cavity 111, is fixedly inserted into the circuit board 12, and can be electrically connected and/or signal connected with the circuit board 12. Thus, the circuit board 12 is electrically and/or signal connected to the stator assembly 233 through the first contact pin 212, and under the action of the circuit board 12, the stator assembly 233 generates an excitation magnetic field, and the rotor assembly 234 drives the valve rod 235 to rotate together under the excitation of the magnetic field. The first matching surface 224 and the first positioning surface 2213 are arranged to be attached and positioned, the first protruding portion 2312 and the positioning hole 2114 are matched and positioned, and the bending portion 2361 and the first positioning groove 2251 are matched and positioned, so that accurate electrical connection and/or signal connection between the first insertion pin 212 and the circuit board 12 and between the first insertion pin 212 and the insertion hole 2311 are facilitated. The motor assembly 23 is disposed in the accommodating cavity 223, so that when the working medium enters the accommodating cavity 223, the motor housing 232 of the motor assembly 23 can contact with the working medium, and under the action of the working medium, the heat dissipation of the motor assembly 23 is facilitated, and further, the heat dissipation of the stator assembly 233 is facilitated.

Referring to fig. 1, the cartridge component 3 includes a connector 31, a cartridge seat 32, and a cartridge assembly 33. The connecting member 31 includes the second flange portion 311, and part of the connecting member 31 is located in the accommodating cavity 223, specifically, at least part of the second flange portion 311 is located in the accommodating cavity 223, the second flange portion 311 is in interference fit with the housing 22, and the second flange portion 311 abuts against the connecting plate 236, so that the motor assembly 23 is limited in the axial direction by the positioning hole 2114 and the second flange portion 311, the motor assembly 23 is positioned in the circumferential direction by the first positioning groove 2251, and the motor assembly 23 is limited in the axial direction and the circumferential direction, thereby fixing the motor assembly 23. Further, in order to prevent the working medium from leaking to the outside from the fitting gap between the second flange portion 311 of the connecting member 31 and the housing case 22, a weld seal is also performed between the periphery of the second flange portion 311 and the housing case 22. Referring to fig. 10 and 11, the connecting member 31 further includes a third mounting portion 312, the third mounting portion 312 forms a third mounting cavity 313, the third mounting cavity 313 is disposed through the connecting member 31, the third mounting portion 312 includes a fourth stepped portion 3121, a fitting portion 3122, and a fitting portion 3123, the fitting portion 3122 is located between the fourth stepped portion 3121 and the fitting portion 3123, the fourth stepped portion 3121 is disposed closer to the upper end surface of the connecting member 31 than the fitting portion 3122, an end of the connecting member 31 close to the motor assembly 23 is defined as an upper end surface, the fitting portion 3122 includes a fitting portion side surface 3124, and the fitting portion side surface 3124 is a rectangular plane surface. Referring to fig. 1, the valve core seat 32 is fixedly connected to the connecting member 31, and in this embodiment, the valve core seat 32 is in interference fit with the connecting member 31, specifically, the fitting portion 3123 of the valve core seat 32 is in interference fit with the connecting member 31. Of course, as another embodiment, the valve core seat 32 and the connecting piece 31 may also be integrally formed. The valve core seat 32 includes at least one flow hole 321 and a valve port 322, the number of the flow holes 321 is at least one, and the flow holes 321 are communicated with the valve port 322. Referring to fig. 12 and 13, the valve core assembly 33 includes a valve core 331 and a nut 332, and the valve core 331 and the nut 332 are fixed by injection molding, specifically, the valve core 331 is used as an injection molding insert and the nut 332 is integrally formed by injection molding. The nut 332 comprises a threaded hole 3321, an internal thread matched with the external thread of the valve rod 235 is arranged on the side wall surface of the threaded hole 3321, and the valve rod 235 is connected with the valve core assembly 33 through the nut 332 in a threaded matching mode. The nut 332 further includes a position-limiting portion 3322 and a balance groove 3323, the position-limiting portion 3322 is a non-rotating body, and the position-limiting portion 3322 may have various structures as long as it can prevent the valve core assembly 33 from rotating circumferentially. In this embodiment, the number of the position-limiting portions 3322 is four, the number of the balance grooves 3323 is 4, the balance grooves 3323 are located between every two position-limiting portions 3322, each position-limiting portion 3323 includes a position-limiting portion side surface 3324, and each position-limiting portion side surface 3324 is a rectangular plane.

Referring to fig. 1, a part of the motor assembly 23 is located in the third mounting cavity 313 of the connecting member 31, a part of the valve core assembly 33 is located in the third mounting cavity 313, the valve rod 235 is in threaded connection with the valve core assembly 33 through the nut 332, the limiting portion 3322 of the nut 332 is in fit limiting with the fitting portion 3122 of the third mounting cavity 312, specifically, the limiting portion side 3324 is in fit arrangement with the fitting portion side 3124, so that circumferential rotation of the valve core assembly 33 in the movement process can be prevented. Because rotor subassembly 234 drives valve rod 235 and rotate circumferentially together under the magnetic field excitation of stator subassembly 233, and valve rod 235 and case subassembly 33 threaded connection, because case subassembly 33 carries out circumference spacing through spacing portion 3322 and cooperation portion 3122 again, promptly the case subassembly 33 can't rotate circumferentially together along with valve rod 235, like this, under the effect of screw thread, case subassembly 33 can be along the axial direction up-and-down reciprocating motion of third installation cavity 313 to make case 331 be close to or keep away from valve port 322 and adjust the aperture of valve port 322. In order to enable the valve core assembly 33 to reciprocate up and down along the axial direction of the third mounting cavity 313, namely along the axial direction of the third mounting cavity 313, the height H of the arrangement matching portion 3122 is greater than the height L of the limiting portion 3322; defining the axial direction along the third mounting cavity 313, the movement of the valve core assembly 33 away from the valve port 322 is an upward movement, the movement of the valve core assembly 33 close to the valve port 322 is a downward movement, the valve core assembly 33 is limited by the motor housing 232 during the upward movement, and the valve core assembly 33 is limited by the valve port 322 during the downward movement.

Referring to fig. 14, the valve seat 4 includes a first port 41, a second port 42, a first mounting portion 43, and a first passage 44, the first mounting portion 43 forming a first mounting cavity 45, the first passage 44 communicating the first port 41 and the second port 42 through the first mounting cavity 45. The first mounting portion 43 includes a fifth step portion 431, and by setting an opening distance of the fifth step portion 431 to the first mounting cavity 45 in advance, a length of the valve body member 3 protruding into the first mounting cavity 45 can be controlled. In this embodiment, the first port 41 and the second port 42 are located on different sides of the valve seat 4, the opening of the first mounting cavity 45 is located on another side of the valve seat 4, and the three sides are respectively different sides of the valve seat 4, which is beneficial to avoiding interference and improving the utilization rate of the valve seat 4.

Referring to fig. 1, part of the spool member 3 is located in the first mounting cavity 45, and the spool seat 32 abuts against the fifth step 431, and at this time, the first channel 44 can communicate the first port 41 and the second port 42 through the valve port 322. Further, a sealing arrangement is further provided between the valve core seat 32 and the first mounting portion 43, which is beneficial to preventing the working medium from leaking from a fit clearance between the valve core seat 32 and the first mounting portion 43, thereby being beneficial to ensuring the partition of the working medium in the first channel 44 when the valve port 322 is abutted against the valve core 331, that is, when the valve port 322 is closed. The connecting piece 31 is fixedly connected with the casing 22, the valve core component 3 extends into the first mounting cavity 45, and the driving component 2 is fixedly connected with the valve seat 4 through a screw. The valve element component 3 and the valve seat 4 are arranged in a sealing manner, specifically, the electronic expansion valve 100 further includes a third sealing ring 7, the third sealing ring 7 is sleeved on the radial periphery of the connecting piece 31, the third sealing ring 7 is located between the second flange portion 311 of the connecting piece 31 and the opening side of the first mounting cavity 45 of the valve seat 4, and the third sealing ring 7 is pressed between the second flange portion 311 and the opening side of the first mounting cavity 45 of the valve seat 4 and is in an elastic deformation state through the screw cooperation of the driving component 2 and the valve seat 4. The provision of the third sealing ring 7 is advantageous in preventing the working medium from leaking out from the gap between the valve seat 4 and the connecting piece 31. As another embodiment, a sixth stepped portion may be provided on the opening side of the first mounting cavity 45, or a sixth stepped portion may be provided on the first mounting portion 43, and the third seal 7 may be elastically deformed between the sixth stepped portion and the second flange portion 311.

Referring to fig. 11, the connecting member 31 further includes a balance hole 314, the balance hole 314 is disposed through the connecting member 31, the balance hole 314 is not directly communicated with the third installation cavity 313, the balance hole 314 is communicated with the accommodating cavity 223 and the first installation cavity 45, and the balance hole 314 is disposed to balance the pressure of the working medium at two ends of the valve core assembly 33, so that the valve core assembly 33 can move smoothly, and meanwhile, the working medium can enter the accommodating cavity 223 quickly, which is beneficial to dissipating heat of the stator assembly 233. Specifically, referring to fig. 15, as shown by the arrow in fig. 15, a part of the working medium in the first mounting cavity 45 passes through the balance hole 314, enters the third mounting cavity 313 along the abutting gap between the connecting member 31 and the motor assembly 23, and is located at one end of the valve core assembly 33; part of the working medium in the first installation cavity 45 is located at the other end of the valve core assembly 33 through the flow hole 321, so that the pressures of the working medium at the two ends of the valve core assembly 33 are balanced, the influence of the pressure difference of the working medium at the two ends of the valve core assembly 33 on the movement of the valve core assembly 33 is favorably reduced, and the valve core assembly 33 can move smoothly.

Referring to fig. 16 to 19, in the electric valve of the second embodiment, compared to the first embodiment, in the second embodiment, referring to fig. 17 and 18, the third mounting portion 312 further includes an opening portion 3125, the opening portion 3125 is formed with an open groove 3126, the open groove 3126 is provided in communication with the third mounting cavity 313, one end of the opening portion 3125 is provided flush with the fourth stepped portion 3121, and the other end of the opening portion 3125 is provided flush with the upper end surface of the connecting piece 31 in the axial direction of the third mounting cavity 313. The link 31 further includes a balancing hole 314 ', the balancing hole 314' communicating with the open groove 3126. Referring to fig. 19, in the second embodiment, by setting the opening distance from the fourth stepped portion 3121 of the third mounting portion 312 to the third mounting cavity 313, a gap is left between the motor housing 232 located in the third mounting cavity 313 and the fourth stepped portion 3121, so that the second embodiment can balance the pressure of the working medium between the third mounting cavity 313 and the first mounting cavity 45 more quickly than the first embodiment, and thus the valve core assembly 33 can operate smoothly. Specifically, as shown in the arrow direction in fig. 19, part of the working medium in the first mounting cavity 45 enters the open groove 3126 through the balance hole 314', and since the motor housing 232 in the third mounting cavity 313 is in clearance fit with the fourth stepped portion 3121, the working medium entering the open groove 3126 directly enters the third mounting cavity 313 along the fit clearance between the fourth stepped portion 3121 and the motor housing 232, and is located at one end of the valve core assembly 33; compared with the first embodiment in which the working medium enters the third mounting cavity 313 through the abutting gap between the connecting piece 31 and the motor assembly 23, the second embodiment can balance the working medium pressure at the two ends of the valve core assembly 33 more quickly, and the valve core assembly 33 can operate smoothly.

Referring to fig. 20 and 21, in a third embodiment of the motor operated valve, compared to the second embodiment, in the third embodiment, referring to fig. 21, a terminal 21' includes a first pin 212 and a glass sintered body 213, and the housing 22 and the first pin 212 are used as inserts to sinter the glass sintered body 213, so as to integrally connect the housing 22, the first pin 212 and the glass sintered body 213. Referring to fig. 20, the cover 22 is fixed to the outer housing 11 by injection molding, specifically, the cover 22 is used as an injection insert to form the outer housing 11 by injection molding, so that in the third embodiment, the cover 22 is fixed to the outer housing 11 by injection molding, and the cover 22 and the first pin 212 are integrally connected by the glass sintered body 213, which is beneficial to reducing the axial height of the electronic expansion valve 100, and at the same time, the number of the first seal ring 5 and the second seal ring 6 can be reduced, so that the assembly is simpler. In addition, referring to fig. 21, in the embodiment, the cover 22 further includes a second positioning groove 226, and when the motor assembly 23 is assembled with the cover 22, the first protrusion 2312 is positioned in cooperation with the second positioning groove 226, which is beneficial to accurately inserting the first pin 212 into the jack 2311.

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

1. The utility model provides an electronic expansion valve, includes drive assembly and case part, the case part with drive assembly connects, electronic expansion valve includes holding chamber and first installation cavity, drive assembly includes motor element, motor element includes stator module, place in the stator module motor element sets up in sealed, the case part includes balancing hole, part the case part is located first installation cavity, at least part motor element is located the holding chamber, the balancing hole intercommunication first installation cavity with the holding chamber.

2. The electronic expansion valve of claim 1, wherein: the valve element component comprises a connecting piece, the connecting piece is connected with the driving component, part of the connecting piece is located in the first installation cavity, part of the connecting piece is located in the containing cavity, and the balance hole is located in the connecting piece.

3. The electronic expansion valve of claim 2, wherein: the electronic expansion valve further comprises a control component, the driving component is connected with the control component, the control component comprises a circuit board and a first accommodating cavity, the circuit board is located in the first accommodating cavity, the driving component comprises a wiring terminal, a part of the wiring terminal is located in the accommodating cavity, a part of the wiring terminal is located in the first accommodating cavity, and the wiring terminal is electrically connected and/or in signal connection with the motor assembly and the circuit board.

4. The electronic expansion valve of claim 3, wherein: the driving part comprises a housing, the control part comprises an outer shell, the electronic expansion valve further comprises a compression nut, the wiring terminal is provided with threads, the compression nut is in threaded connection with the wiring terminal and compresses the housing between the outer shell and the wiring terminal, and the housing is fixedly connected with the outer shell.

5. The electronic expansion valve of claim 4, wherein: the wiring terminal comprises a post body, a first contact pin and a glass sintered body, wherein the post body and the first contact pin are used as inserts and sintered to form the glass sintered body, so that the post body, the first contact pin and the glass sintered body are integrally connected; one end of the first contact pin is located in the first accommodating cavity and is electrically connected and/or signal connected with the circuit board, and the other end of the first contact pin is located in the accommodating cavity and is electrically connected and/or signal connected with the motor assembly.

6. The electronic expansion valve of claim 3, wherein: the driving part comprises a housing, the control part comprises an outer shell, and the outer shell is fixed with a part of the housing in an injection molding mode; the wiring terminal comprises a first pin and a glass sintered body, the housing and the first pin are used as inserts, the glass sintered body is formed by sintering, and the housing, the first pin and the glass sintered body are integrally connected; one end of the first contact pin is located in the first accommodating cavity and is electrically connected with the circuit board and/or in signal connection with the circuit board, and the other end of the first contact pin is located in the accommodating cavity and is electrically connected with the motor assembly.

7. The electronic expansion valve of claim 5, wherein: the wiring terminal also comprises a first positioning surface and a positioning hole, and the first positioning surface and the positioning hole are both positioned on the column body; the motor assembly comprises a first protruding part and a connecting plate, and the connecting plate comprises a bending part; the housing comprises a first matching surface and a first step part, and the first step part comprises a first positioning groove; the first positioning surface is attached to the first matching surface, at least part of the first protruding portion is located in the positioning hole, the connecting plate is abutted to the first step portion, and at least part of the bending portion is located in the first positioning groove.

8. The electronic expansion valve of claim 6, wherein: the housing comprises a first step part, the first step part comprises a first positioning groove, and the housing further comprises a second positioning groove; the motor assembly comprises a first protruding part and a connecting plate, and the connecting plate comprises a bending part; at least part of the first protruding part is located in the second positioning groove, the connecting plate is abutted to the first step part, and at least part of the bending part is located in the first positioning groove.

9. An electronic expansion valve according to any of claims 2-8, wherein: the valve element component further comprises a valve element assembly, the valve element assembly is in threaded connection with the motor assembly, the valve element assembly comprises a limiting portion, the limiting portion is a non-rotating body, the connecting piece comprises a matching portion, the limiting portion comprises a limiting portion side face, the matching portion comprises a matching portion side face, the limiting portion side face is attached to the matching portion side face, and the valve element assembly is limited to circumferential rotation of the connecting piece.

10. The electronic expansion valve of claim 9, wherein: the valve element component further comprises a valve element seat, the connecting piece is in interference fit with the valve element seat or is integrally formed with the valve element seat, the valve element seat comprises a valve port, the height of the matching portion is larger than that of the limiting portion along the axial direction of the valve element component, the valve element component can move up and down under the action of the motor component, the valve element component can abut against the motor component in the upward movement process, and the valve element component can abut against the valve port in the downward movement process.