Electronic expansion valve

Abstract

An electronic expansion valve includes a drive component, a valve core component, an accommodating chamber and a first installation chamber. The valve core component is connected to the drive component. The motor assembly includes a stator assembly. The stator assembly is built into the motor assembly and sealed. The motor assembly is located in the accommodating chamber, part of the valve core component is located in the first installation chamber, and part of the valve core component is located in the accommodating chamber. The first installation chamber and the accommodating chamber are connected through a balancing hole. In this way, when the electronic expansion valve is working, the working medium can enter the accommodating chamber from the first installation chamber through the balancing hole, and the working medium can contact the outer periphery of the motor assembly. Under the action of the working medium, it is beneficial to improve the heat dissipation of the motor assembly, and then it is beneficial to improve the heat dissipation of the stator assembly.

Description

Technical field

[0001] The present invention relates to the technical field of fluid control components, and in particular to an electronic expansion valve. [Background Technology]

[0002] In automotive air conditioning systems, an electronic expansion valve is used as a throttling element to improve the flow control accuracy of the working medium. The inventors are aware of a structure in which the stator assembly and rotor assembly of the electronic expansion valve are separately arranged. When the electronic expansion valve is in operation, the stator assembly dissipates heat, and how to improve the heat dissipation of the stator assembly is a technical issue. [Summary of the invention]

[0003] An object of the present invention is to provide an electronic expansion valve, which is beneficial to improving the heat dissipation of a stator assembly.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] An electronic expansion valve includes a drive component and a valve core component, the valve core component is connected to the drive component, the electronic expansion valve includes a accommodating chamber and a first installation chamber, the drive component includes a motor assembly, the motor assembly includes a stator assembly, the stator assembly is built into the motor assembly and sealed, the valve core component includes a balancing hole, part of the valve core component is located in the first installation chamber, at least part of the motor assembly is located in the accommodating chamber, and the balancing hole connects the first installation chamber and the accommodating chamber.

[0006] The present invention provides an electronic expansion valve, which includes a driving component, a valve core component, an accommodating chamber and a first installation chamber. The valve core component is connected to the driving component, and the motor assembly includes a stator assembly. The stator assembly is built into the motor assembly and sealed. The motor assembly is located in the accommodating chamber, part of the valve core component is located in the first installation chamber, and part of the valve core component is located in the accommodating chamber. The first installation chamber and the accommodating chamber are connected through a balancing hole. In this way, when the electronic expansion valve is working, the working medium can enter the accommodating chamber from the first installation chamber through the balancing hole, and the working medium can contact the outer periphery of the motor assembly. Under the action of the working medium, it is beneficial to improve the heat dissipation of the motor assembly, and then it is beneficial to improve the heat dissipation of the stator assembly.

Brief Description of the Drawings

[0007] Figure 1 It is a cross-sectional structural schematic diagram of a first embodiment of an electronic expansion valve;

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

[0009] Figure 3 yes Figure 1A three-dimensional structural diagram of the middle terminal;

[0010] Figure 4 yes Figure 3 A schematic diagram of a cross-sectional structure of a terminal;

[0011] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure of the middle cover;

[0012] Figure 6 yes Figure 5 A schematic cross-sectional structure diagram of a cover;

[0013] Figure 7 yes Figure 1 A schematic diagram of a three-dimensional structure of the middle cover in another direction;

[0014] Figure 8 yes Figure 1 A three-dimensional structural diagram of the motor assembly;

[0015] Figure 9 yes Figure 8 A schematic cross-sectional structural diagram of a motor assembly;

[0016] Figure 10 yes Figure 1 A three-dimensional structural diagram of the connecting part;

[0017] Figure 11 yes Figure 10 A schematic cross-sectional structure diagram of a connecting member;

[0018] Figure 12 yes Figure 1 A three-dimensional structural diagram of the valve core assembly;

[0019] Figure 13 yes Figure 12 A schematic cross-sectional structural diagram of a valve core assembly;

[0020] Figure 14 yes Figure 1 A schematic diagram of the cross-section structure of the middle valve seat;

[0021] Figure 15 yes Figure 1 A partially enlarged cross-sectional structural diagram of the electronic expansion valve;

[0022] Figure 16 is a schematic cross-sectional view of a second embodiment of the electronic expansion valve;

[0023] Figure 17 yes Figure 16 A three-dimensional structural diagram of the connecting part;

[0024] Figure 18 yes Figure 17 A schematic cross-sectional structure diagram of a connecting member;

[0025] Figure 19 yes Figure 16 A partially enlarged cross-sectional structural diagram of the electronic expansion valve;

[0026] Figure 20 is a schematic cross-sectional structural diagram of a third embodiment of an electronic expansion valve;

[0027] Figure 21 yes Figure 20 A schematic diagram of the cross-sectional structure of the middle cover and terminal combination. [Specific implementation method]

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

[0029] See also Figure 1 The electronic expansion valve 100 includes a control component 1, a drive component 2, a valve core component 3 and a valve seat 4. The control component 1 is connected to the drive component 2 and can be electrically connected and / or signal connected. The drive component 2 is connected to the valve seat 4. At least part of the valve core component 3 is located in the first installation cavity formed by the valve seat 4, and the valve core component 3 is connected to the drive component 2.

[0030] See also Figure 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. The circuit board 12 is located in the first accommodating cavity 111. The control component 1 also includes a first interface portion 14 and a second pin 15. The first interface portion 14 is integrally injection-molded with the outer shell 11. The first interface portion 14 forms a second accommodating cavity 141. The middle portion of the second pin 15 is injection-molded and fixed to the outer shell 11. One end of the second pin 15 is located in the first accommodating cavity 111 and is electrically and / or signal-connected to the circuit board 12. The other end of the second pin 15 is located in the second accommodating cavity 141 and is electrically and / or signal-connected to the outside world. Figure 2 The outer shell 11 also includes a second mounting portion 112, the second mounting portion 112 forms a second mounting cavity 113, the second mounting cavity 113 is connected to the first accommodating cavity 111, the second mounting portion 112 includes a second step portion 114 and a third step portion 115, and the third step portion 115 is arranged closer to the first accommodating cavity 111 than the second step portion 114.

[0031] See also Figure 1The driving component 2 includes a terminal 21, a housing 22, a motor assembly 23 and a compression nut 24. The motor assembly 23 is located in the housing 22, one end of the terminal 21 abuts against the housing 22, and the terminal 21 is threadedly connected to the compression nut 24. Figure 3 and Figure 4 The terminal 21 includes a column 211, a first pin 212 and a glass frit 213. The column 211 and the first pin 212 are used as inserts, and the glass frit 213 is sintered to realize the connection of the column 211, the first pin 212 and the glass frit 213 into one. The glass frit 213 has good pressure bearing capacity and good sealing performance. The glass frit 213 enables the terminal 21 to better withstand the pressure of the working medium, and at the same time helps to prevent the working medium from entering the first accommodating cavity 111 through the terminal 21 and causing damage to the circuit board 12. The column 211 includes a first side portion 2111, a first flange portion 2112, a first positioning surface 2113 and a positioning hole 2114. The outer peripheral surface of the first side portion 2111 is formed with an external thread. The first positioning surface 2113 is a plane. Along the axial direction of the column 211, the first flange portion 2112 is recessed inward to form a first sealing groove 2115. The first sealing groove 2115 forms a first groove cavity. Both ends of the first pin 212 extend out of the column 211.

[0032] See also Figure 1 The cover 22 is located on the periphery of the motor assembly 23. One end of the cover 22 is fixedly connected to the control component 1, and the other end of the cover 22 is fixedly connected to the valve seat 4. Figure 5 and Figure 6 The housing 22 includes a first end portion 221, a first through hole 222 is provided on the first end portion 221, and the housing 22 forms a receiving cavity 223. The first through hole 222 is connected to the receiving cavity 223, and the side wall of the first through hole 222 has a first mating surface 224. Figure 1The first end portion 221 of the cover 22 is located in the second mounting cavity 113, and the first end portion 221 abuts against the second step portion 114; part of the terminal 21 is located in the accommodating cavity 223 of the cover 22, and part of the terminal 21 located in the accommodating cavity 223 abuts against the inner side of the first end portion 221 through the first flange portion 2112; another part of the terminal 21 passes through the first through hole 222 and the first end portion 221 and is located in the first accommodating cavity 111, and at least part of the first side portion 2111 of the terminal 21 is located in the first accommodating cavity 111; the first mating surface 224 abuts against the first positioning surface 2 213 is provided in a fitting manner, and is used to position and / or limit the rotation of the terminal 21; the compression nut 24 is located in the first accommodating cavity 111, and the compression nut 24 is sleeved on the radial outer periphery of the first side portion 2111. The inner peripheral surface of the compression nut 24 is provided with an internal thread that cooperates with the external thread of the first side portion 2111. The compression nut 24 is rotated to make the compression nut 24 threadedly cooperate with the first side portion 2221. The compression nut 24 and the first flange portion 2112 press the first end portion 221 of the cover 22 and the outer shell 11, thereby achieving a fixed connection between the cover 22 and the control component 1. Furthermore, a sealing arrangement can be provided between the outer shell 11 and the cover 22, and between the terminal 21 and the cover 22. Specifically, see Figure 1 The electronic expansion valve 100 includes a first sealing ring 5 and a second sealing ring 6. Part of the first sealing ring 5 is located in the first groove cavity and abuts the first sealing groove 2115 and the first end 221. The lower side of the first end 221 and the first sealing groove 2115 compress the first sealing ring 5 into an elastically deformed state. The second sealing ring 6 is located between the third step 115 and the upper side of the first end 221. The third step 115 and the first end 221 compress the second sealing ring 6 into an elastically deformed state. The provision of the first sealing ring 5 helps prevent the working medium from leaking outward from the gap between the first end 221 of the housing 22 and the terminal 21. The provision of the second sealing ring 6 helps prevent moisture in the external environment from entering the first accommodating cavity 111 through the gap between the first end 221 of the housing 22 and the outer shell 11, thereby damaging the circuit board 11. The other end of the housing 22 is fixedly connected to the valve seat 4 by screws. Of course, as another embodiment, the cover 22 and the control component 1 can also be integrally injection molded. Specifically, the cover 22 and the outer shell 11 are integrally injection molded, and the other end of the cover 22 is fixedly connected to the valve seat 4 by screws. Figure 7 The cover shell 22 also includes a first step portion 225. Along the axial direction of the cover shell 22, the first step portion 225 is provided with a first positioning groove 2251 recessed inwardly. The number of the first positioning groove 2251 is at least one. In this embodiment, the number of the first positioning grooves 2251 is two and they are symmetrically arranged.

[0033] See also Figure 8 and Figure 9The motor assembly 23 includes an electrical connection portion 231, a motor housing 232, a stator assembly 233, a rotor assembly 234, and a valve stem 235. The valve stem 235 is fixedly connected to the rotor assembly 234. In this embodiment, the valve stem 235 is fixed to the rotor assembly 234 by an interference fit. The stator assembly 233 is located on the periphery of the rotor assembly 234, and the motor housing 232 is located on the periphery of the stator assembly 233. The motor housing 232 is fixedly connected to the electrical connection portion 231. In this embodiment, the motor housing 232 and the electrical connection portion 231 are fixed by crimping. The motor housing 232 and the electrical connection portion 231 together encase the stator assembly 233 and the rotor assembly 234, and the stator assembly 233 and the rotor assembly 234 are sealed. This helps prevent the infiltration of the working medium and damage to the motor assembly 23. One end of the valve stem 235 is located within the enclosed space formed by the motor housing 232 and the electrical connector 231, abutting the electrical connector 231. The other end of the valve stem 235 is located outside the motor housing 232. The end of the valve stem 235 located outside the motor housing 232 is provided with external threads. The electrical connector 231 includes a socket 2311 and a first protrusion 2312. The number of sockets 2311 is the same as the number of first pins 212. The motor assembly 23 also includes a connecting plate 236, which is fixedly connected to the motor housing 232. In this embodiment, the connecting plate 236 and the motor housing 232 are fixedly connected by riveting. The radial diameter of the connecting plate 236 is larger than the radial diameter of the motor housing 232. Along the radial direction of the motor assembly 23, the connecting plate 236 protrudes from the motor housing 232. The connecting plate 236 includes a bending portion 2361. The number of the bending portions 2361 is the same as that of the first positioning grooves 2221. The bending portions 2361 are symmetrically arranged. The bending portions 2361 are used to cooperate with the first positioning grooves 2251 for positioning.

[0034] See also Figure 1Part of the motor assembly 23 is located in the accommodating chamber 223. The first protrusion 2312 of the electrical connector 231 is positioned in engagement with the positioning hole 2114 of the terminal 21. The connecting plate 236 abuts the first step 225. The bent portion 2361 engages the first positioning groove 2251 and is positioned in engagement with the first positioning groove 2251. The first pin 212 is located at one end of the accommodating chamber 223 and is plugged into and fixed to the socket 2311 of the electrical connector 231, enabling electrical and / or signal connections with the stator assembly 233. The first pin 212 is located at the other end of the first accommodating chamber 111 and is plugged into and fixed to the circuit board 12, enabling electrical and / or signal connections with the circuit board 12. In this way, the circuit board 12 is electrically and / or signal-connected to the stator assembly 233 via the first pin 212. Under the action of the circuit board 12, the stator assembly 233 generates an excitation magnetic field, and under the excitation of the magnetic field, the rotor assembly 234 drives the valve stem 235 to rotate. The first mating surface 224 is positioned in abutment with the first positioning surface 2213, the first protrusion 2312 is positioned in engagement with the positioning hole 2114, and the bent portion 2361 is positioned in engagement with the first positioning groove 2251. This facilitates accurate electrical and / or signal connection between the first pin 212 and the circuit board 12, and between the first pin 212 and the connector 2311. The motor assembly 23 is positioned within the accommodating chamber 223. When a working medium enters the accommodating chamber 223, the motor housing 232 of the motor assembly 23 can come into contact with the working medium. This facilitates heat dissipation from the motor assembly 23 and, further, from the stator assembly 233.

[0035] See also Figure 1 The valve core component 3 includes a connector 31, a valve core seat 32 and a valve core assembly 33. The connector 31 includes a second flange portion 311, and part of the connector 31 is located in the accommodating chamber 223. Specifically, at least part of the second flange portion 311 is located in the accommodating chamber 223. The second flange portion 311 is interference fit with the cover shell 22, and the second flange portion 311 abuts against the connecting plate 236. In this way, the motor assembly 23 is limited in the axial direction by the positioning hole 2114 and the second flange portion 311, and the motor assembly 23 is positioned in the circumferential direction by the first positioning groove 2251. The motor assembly 23 is limited in the axial and circumferential directions, thereby achieving the fixation of the motor assembly 23. Furthermore, in order to prevent the working medium from leaking outward from the fitting gap between the second flange portion 311 of the connector 31 and the cover shell 22, the periphery of the second flange portion 311 is also welded and sealed with the cover shell 22. See Figure 10 and Figure 11The connector 31 also includes a third mounting portion 312, which forms a third mounting cavity 313. The third mounting cavity 313 is set through the connector 31. The third mounting portion 312 includes a fourth step portion 3121, a matching portion 3122, and an assembly portion 3123. The matching portion 3122 is located between the fourth step portion 3121 and the assembly portion 3123. The fourth step portion 3121 is closer to the upper end surface of the connector 31 than the matching portion 3122. The end of the connector 31 close to the motor assembly 23 is defined as the upper end surface. The matching portion 3122 includes a matching portion side surface 3124, which is a rectangular plane. Figure 1 The valve core seat 32 is fixedly connected to the connecting member 31. In this embodiment, the valve core seat 32 and the connecting member 31 are interference fit. Specifically, the valve core seat 32 and the assembly portion 3123 of the connecting member 31 are interference fit. Of course, as other embodiments, the valve core seat 32 and the connecting member 31 can also be integrally formed. The valve core seat 32 includes a flow hole 321 and a valve port 322. The number of the flow hole 321 is at least one, and the flow hole 321 is connected to the valve port 322. Figure 12 and Figure 13 The valve core assembly 33 includes a valve core 331 and a nut 332. The valve core 331 and the nut 332 are fixed by injection molding. Specifically, the valve core 331 is used as an injection molded insert, and the nut 332 is integrally injection molded. The nut 332 includes a threaded hole 3321. The side wall of the threaded hole 3321 is provided with an internal thread that mates with the external thread of the valve stem 235. The valve stem 235 and the valve core assembly 33 are threadedly connected by the nut 332. The nut 332 also includes a limiting portion 3322 and a balancing groove 3323. The limiting portion 3322 is a non-rotating body. The limiting portion 3322 can have various structures, as long as it can prevent the valve core assembly 33 from circumferential rotation. In this embodiment, there are four limiting portions 3322 and four balancing grooves 3323 . The balancing grooves 3323 are located between any two limiting portions 3322 . The limiting portions 3323 include limiting portion side surfaces 3324 , which are rectangular planes.

[0036] See also Figure 1Part of the motor assembly 23 is located in the third installation cavity 313 of the connecting member 31, and part of the valve core assembly 33 is located in the third installation cavity 313. The valve stem 235 and the valve core assembly 33 are threadedly connected through the nut 332. The limiting portion 3322 of the nut 332 cooperates with the matching portion 3122 of the third installation portion 312 to limit. Specifically, the side surface 3324 of the limiting portion is fitted with the side surface 3124 of the matching portion, so as to prevent the valve core assembly 33 from circumferential rotation during movement. Because the rotor assembly 234 is excited by the magnetic field of the stator assembly 233, it drives the valve stem 235 to rotate circumferentially, and the valve stem 235 is threadedly connected to the valve core assembly 33. Since the valve core assembly 33 is circumferentially limited by the limiting portion 3322 and the matching portion 3122, that is, the valve core assembly 33 cannot rotate circumferentially with the valve stem 235, under the action of the thread, the valve core assembly 33 can reciprocate up and down along the axial direction of the third mounting cavity 313, so that the valve core 331 is close to or away from the valve port 322 to adjust the opening of the valve port 322. In order to enable the valve core assembly 33 to reciprocate up and down along the axial direction of the third installation cavity 313, that is, it is necessary to set the height H of the matching portion 3122 to be greater than the height L of the limiting portion 3322 along the axial direction of the third installation cavity 313; it is defined that the movement of the valve core assembly 33 away from the valve port 322 along the axial direction of the third installation cavity 313 is an upward movement, and 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.

[0037] See also Figure 14 The valve seat 4 includes a first port 41, a second port 42, a first mounting portion 43, and a first channel 44. The first mounting portion 43 forms a first mounting cavity 45, and the first channel 44 connects the first port 41 and the second port 42 through the first mounting cavity 45. The first mounting portion 43 includes a fifth step 431. By presetting the distance from the fifth step 431 to the opening of the first mounting cavity 45, the length of the valve core component 3 extending 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, and the opening of the first mounting cavity 45 is located on another side of the valve seat 4. The aforementioned three sides are different sides of the valve seat 4, which helps avoid interference and improves the utilization rate of the valve seat 4.

[0038] See also Figure 1, part of the valve core component 3 is located in the first mounting cavity 45, and the valve core seat 32 abuts the fifth step portion 431. At this time, the first channel 44 can communicate with the first port 41 and the second port 42 through the valve port 322. Furthermore, a seal is provided between the valve core seat 32 and the first mounting portion 43 to prevent leakage of the working medium from the fitting gap between the valve core seat 32 and the first mounting portion 43, thereby ensuring that the working medium in the first channel 44 is isolated when the valve port 322 abuts the valve core 331, that is, when the valve port 322 is closed. The connecting member 31 is fixedly connected to the housing 22, the valve core component 3 extends into the first mounting cavity 45, and the driving component 2 is fixedly connected to the valve seat 4 by screws. A seal is provided between the valve core component 3 and the valve seat 4. Specifically, the electronic expansion valve 100 further includes a third sealing ring 7, which is sleeved on the radial outer periphery of the connector 31. The third sealing ring 7 is located between the second flange portion 311 of the connector 31 and the opening side of the first mounting cavity 45 of the valve seat 4. The third sealing ring 7 is compressed between the second flange portion 311 and the opening side of the first mounting cavity 45 of the valve seat 4 by the screws of the drive component 2 and the valve seat 4, and is placed in an elastically deformed state. The provision of the third sealing ring 7 helps prevent the working medium from leaking outward from the gap between the valve seat 4 and the connector 31. Of course, as other embodiments, a sixth step portion may also be provided on the opening side of the first mounting cavity 45, or the first mounting portion 43 may also be provided with a sixth step portion, compressing the third sealing ring 7 between the sixth step portion and the second flange portion 311 and placing it in an elastically deformed state.

[0039] See also Figure 11 The connector 31 also includes a balancing hole 314, which is set through the connector 31. The balancing hole 314 is not directly connected to the third installation cavity 313. The balancing hole 314 connects the accommodating cavity 223 and the first installation cavity 45. The provision of the balancing hole 314 is conducive to balancing the working medium pressure at both ends of the valve core assembly 33, so that the valve core assembly 33 can move smoothly. At the same time, it can quickly allow the working medium to enter the accommodating cavity 223, which is conducive to heat dissipation of the stator assembly 233. For details, see Figure 15 ,like Figure 15 As shown in the direction of the middle arrow, part of the working medium located in the first installation chamber 45 passes through the balancing hole 314, enters the third installation chamber 313 along the abutment gap between the connecting piece 31 and the motor assembly 23, and is located at one end of the valve core assembly 33; part of the working medium located in the first installation chamber 45 passes through the circulation hole 321 and is located at the other end of the valve core assembly 33, thereby balancing the working medium pressure at both ends of the valve core assembly 33, which is beneficial to reducing the influence of the pressure difference of the working medium at both ends of the valve core assembly 33 on the movement of the valve core assembly 33, so that the valve core assembly 33 can move smoothly.

[0040] See also Figures 16 to 19 , is a second embodiment of the electric valve, compared to the first embodiment, in the second embodiment, see Figure 17 and Figure 18 The third mounting portion 312 further includes an opening portion 3125, which is formed with an opening slot 3126. The opening slot 3126 is connected to the third mounting cavity 313. Along the axial direction of the third mounting cavity 313, one end of the opening portion 3125 is flush with the fourth step portion 3121, and the other end of the opening portion 3125 is flush with the upper end surface of the connecting member 31. The connecting member 31 further includes a balancing hole 314', which is connected to the opening slot 3126. Figure 19 In the second embodiment, by setting the opening distance from the fourth step 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 step portion 3121. In this way, compared with the first embodiment, the second embodiment can more quickly balance the pressure of the working medium between the third mounting cavity 313 and the first mounting cavity 45, so that the valve core assembly 33 can operate smoothly. Specifically, as Figure 19 As shown in the direction of the middle arrow, part of the working medium located in the first installation chamber 45 enters the opening groove 3126 through the balancing hole 314'. Since the motor housing 232 located in the third installation chamber 313 is clearance-matched with the fourth step portion 3121, the working medium entering the opening groove 3126 directly enters the third installation chamber 313 along the clearance between the fourth step portion 3121 and the motor housing 232, and is located at one end of the valve core assembly 33; part of the working medium located in the first installation chamber 45 is located at the other end of the valve core assembly 33 through the circulation hole 321, thereby balancing the working medium pressure at both ends of the valve core assembly 33. Compared with the first embodiment in which the working medium enters the third installation chamber 313 through the abutment gap between the connecting piece 31 and the motor assembly 23, the second embodiment can more quickly balance the working medium pressure at both ends of the valve core assembly 33, so that the valve core assembly 33 can operate smoothly.

[0041] See also Figure 20 and Figure 21 , is a third embodiment of the electric valve, compared to the second embodiment, in the third embodiment, see Figure 21 The terminal 21' includes a first pin 212 and a glass frit 213. The cover 22 and the first pin 212 are used as inserts, and the glass frit 213 is sintered to form the cover 22, the first pin 212 and the glass frit 213, thereby achieving an integral connection between the cover 22, the first pin 212 and the glass frit 213. Figure 20The cover 22 is fixed to the outer shell 11 by injection molding. Specifically, the cover 22 is used as an injection molded insert and the outer shell 11 is integrally formed by injection molding. Thus, in the third embodiment, the cover 22 is fixed to the outer shell 11 by injection molding, and the cover 22 and the first pin 212 are integrally connected via the glass frit 213. Compared with the second embodiment, this is conducive to reducing the axial height of the electronic expansion valve 100, and at the same time, the first sealing ring 5 and the second sealing ring 6 can be reduced, making assembly easier. In addition, see Figure 21 In this embodiment, the cover 22 also includes a second positioning groove 226. 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 conducive to accurate connection between the first pin 212 and the socket 2311.

[0042] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electronic expansion valve, comprising a drive component and a valve core component, the valve core component being connected to the drive component, the electronic expansion valve comprising a accommodating chamber and a first mounting chamber, the drive component comprising a cover, the cover forming the accommodating chamber, the drive component comprising a motor assembly, the motor assembly comprising a stator assembly, the stator assembly being built into the motor assembly and sealed, the valve core component comprising a balancing hole, part of the valve core component being located in the first mounting chamber, at least part of the motor assembly being located in the accommodating chamber, the balancing hole connecting the first mounting chamber and the accommodating chamber; the valve core component comprising a connecting piece, the connecting piece being connected to the drive component, part of the connecting piece being located in the first mounting chamber, part of the connecting piece being located in the accommodating chamber, and the balancing hole being located on the connecting piece.

2. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve also includes a control component, the drive component is connected to the control component, the control component includes a circuit board and a first accommodating chamber, the circuit board is located in the first accommodating chamber, the drive component includes terminals, some of the terminals are located in the accommodating chamber, and some of the terminals are located in the first accommodating chamber, the terminals are electrically connected and / or signal-connected to the motor assembly and the circuit board.

3. The electronic expansion valve according to claim 2, characterized in that: The control component includes an outer shell, the electronic expansion valve also includes a clamping nut, the terminal is provided with a thread, the clamping nut is threadedly connected to the terminal, and the cover is clamped between the outer shell and the terminal, and the cover is fixedly connected to the outer shell.

4. The electronic expansion valve according to claim 3, characterized in that: The terminal includes a column, a first pin and a glass sintered body. The column and the first pin are used as inserts, and the glass sintered body is sintered to form the column, the first pin and the glass sintered body are connected as one body; one end of the first pin is located in the first accommodating cavity and is electrically connected and / or connected to the circuit board for signal connection, and the other end of the first pin is located in the accommodating cavity and is electrically connected and / or connected to the motor assembly for signal connection.

5. The electronic expansion valve according to claim 2, characterized in that: The control component includes an outer shell, which is injection-molded and fixed to a portion of the cover; the terminal includes a first pin and a glass sinter, and the cover and the first pin are used as inserts, and the glass sinter is sintered to form the cover, the first pin and the glass sinter are connected as one piece; one end of the first pin is located in the first accommodating cavity and is electrically connected and / or signal-connected to the circuit board, and the other end of the first pin is located in the accommodating cavity and is electrically connected to the motor assembly.

6. The electronic expansion valve according to claim 4, characterized in that: The terminal also includes a first positioning surface and a positioning hole, and the first positioning surface and the positioning hole are both located on the column; the motor assembly includes a first protrusion and a connecting plate, and the connecting plate includes a bent portion; the cover includes a first mating surface and a first step portion, and the first step portion includes a first positioning groove; the first positioning surface is arranged to fit the first mating surface, at least part of the first protrusion is located in the positioning hole, the connecting plate abuts against the first step portion, and at least part of the bent portion is located in the first positioning groove.

7. The electronic expansion valve according to claim 5, characterized in that: The cover shell includes a first step portion, the first step portion includes a first positioning groove, and the cover shell also includes a second positioning groove; the motor assembly includes a first protrusion and a connecting plate, and the connecting plate includes a bent portion; at least part of the first protrusion is located in the second positioning groove, the connecting plate abuts against the first step portion, and at least part of the bent portion is located in the first positioning groove.

8. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The valve core component also includes a valve core assembly, which is threadedly connected to the motor assembly. The valve core assembly includes a limiting portion, which is a non-rotating body. The connecting piece includes a matching portion, which includes a limiting portion side surface, and the matching portion includes a matching portion side surface. The limiting portion side surface is fitted with the matching portion side surface to limit the circumferential rotation of the valve core assembly relative to the connecting piece.

9. The electronic expansion valve according to claim 8, characterized in that: The valve core component also includes a valve core seat, the connecting piece and the valve core seat are interference fit or the connecting piece and the valve core seat are integrally formed, the valve core seat includes a valve port, and along the axial direction of the valve core assembly, the height of the fitting portion is greater than the height of the limiting portion. The valve core assembly can move up and down under the action of the motor assembly, and the valve core assembly can abut against the motor assembly during the upward movement, and the valve core assembly can abut against the valve port during the downward movement.

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