CN110735958A - electronic expansion valve and thermal management assembly - Google Patents

Abstract

An electronic expansion valve includes a valve body, a valve part, a sensor and a control part, the valve body includes a first installation part and a second installation part, the valve part is arranged in the first installation part, the control part has a control cavity, and the sensor is located in the second installation part and the control chamber, a first sealing member is arranged between the control part and the valve body, and the first sealing member is arranged around the outer periphery of the control chamber; this arrangement is beneficial to improve the sealing performance of the electronic expansion valve.

Description

An electronic expansion valve and thermal management assembly

technical field

The present invention relates to the technical field of fluid control, in particular to an electronic expansion valve and a thermal management assembly.

Background technique

The refrigeration system includes a compressor, an evaporator, a condenser and a throttling element. Usually, an electronic expansion valve is used as the throttling element, and the electronic expansion valve is used to throttle the refrigerant of the refrigeration system. The electronic expansion valve is provided with an electronic control board. In order to ensure the working performance of the electronic control board, the working environment of the electronic control board needs to be sealed. Therefore, the tightness of the control chamber where the electronic control board of the electronic expansion valve is located is a technical problem.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electronic expansion valve and a thermal management system, so as to help improve the sealing performance of the control chamber where the electronic control board of the electronic expansion valve is located.

An electronic expansion valve includes a valve body, a valve component, a control part and a sensor, the valve body includes a first mounting part and a second mounting part, the valve body has a first channel and a second channel, the first The channel is not communicated with the second channel, the first mounting part has a first cavity, the second mounting part has a second cavity, the first cavity can communicate with the first channel, the second The cavity communicates with the second passage, the opening of the first cavity and the opening of the second cavity are located on the same side of the valve body, and the opening of the first cavity and the opening of the second cavity are located at the same side of the valve body. The first side wall of the valve body, the valve component is fixedly connected to the first mounting portion, the sensor is fixed to the second mounting portion, the sensor is signally connected to the electronic control board, and the control The interface part includes a cover body, an electric control board, an interface part and a stator assembly, the interface part is injection-molded and fixed to the cover body, and the interface part is used for the electrical connection and/or signal connection between the electronic expansion valve and the outside world. The control part has a control cavity, the cover body forms at least part of the control cavity, the electronic control board is placed in the control cavity, the sensor is located in the second cavity and the control cavity, the electronic expansion valve A first sealing member is included, the first sealing member is arranged around the outer periphery of the control chamber, and the first sealing member is pressed between the cover body and the valve body.

A thermal management assembly includes an electronic expansion valve and a heat exchanger, the electronic expansion valve is fixedly connected to the heat exchanger, the electronic expansion valve includes a valve body, a valve component, a control part and a sensor, the valve body includes a first installation part and a second installation part, the valve body has a first channel and a second channel, the first channel is not communicated with the second channel, the first installation part has a first cavity, the second The mounting part has a second cavity, the first cavity can communicate with the first channel, the second cavity communicates with the second channel, and the opening of the first cavity and the opening of the second cavity are located at On the same side of the valve body, the opening of the first cavity and the opening of the second cavity are located on the first side wall of the valve body, the valve part is fixedly connected with the first installation part, and the The sensor is fixed to the second installation part, the sensor is signally connected to the electric control board, the control part includes a cover body, an electric control board, an interface part and a stator assembly, and the interface part is injection molded with the cover body The interface part is used for electrical connection and/or signal connection between the electronic expansion valve and the outside world, the control part has a control cavity, the cover body forms at least part of the control cavity, and the electronic control board is placed in the The control chamber, the sensor is located in the second chamber and the control chamber, the electronic expansion valve includes a first sealing member, the first sealing member is arranged around the outer periphery of the control chamber, the first sealing member is A seal is pressed between the cover body and the valve body; the valve body includes a first inlet, a second inlet, a first outlet and a second outlet, and the first passage communicates with the first The outlet and the first inlet, the second passage communicates with the second outlet and the second inlet, the first outlet communicates with the inlet of the heat exchanger, and the second inlet communicates with the heat exchanger The outlet of the heat exchanger communicates with the outlet of the heat exchanger, and the inlet of the heat exchanger communicates with the outlet of the heat exchanger through the third passage of the heat exchanger.

The thermal management assembly includes an electronic expansion valve, and the electronic expansion valve includes a valve body, a valve component, a sensor, a control part and a first seal, the first seal is arranged on the outer periphery of the second cavity, and the first seal is pressed against the between the cover body and the valve body; since the second cavity corresponds to the control cavity, in order to prevent external water and other media from entering the control cavity through the second cavity and affect the working performance of the circuit board, a first sealing member is arranged on the periphery of the control cavity , this arrangement is beneficial to improve the sealing performance of the control chamber where the electronic control board of the electronic expansion valve is located.

Description of drawings

1 is a schematic block diagram of an embodiment of a refrigeration system;

FIG. 2 is a schematic structural diagram of an embodiment of a thermal management assembly;

FIG. 3 is a schematic three-dimensional structure diagram of an electronic expansion valve in one direction in the technical solution;

FIG. 4 is a schematic three-dimensional structure diagram of the electronic expansion valve in another direction in the technical solution;

Fig. 5 is the B-B direction sectional structure schematic diagram of the electronic expansion valve in Fig. 3;

Fig. 6 is the C-C direction sectional structure schematic diagram of the electronic expansion valve in Fig. 4;

Fig. 7 is the A-A direction sectional structure schematic diagram of the electronic expansion valve in Fig. 3;

Fig. 8 is the partial structure enlarged schematic diagram of D part in Fig. 7;

Fig. 9 is the three-dimensional structure schematic diagram of the valve body in Fig. 3;

Fig. 10 is a three-dimensional schematic diagram of the sensor in Fig. 6;

11 is a schematic diagram of one of the assembly steps of the electronic expansion valve;

12 is a schematic diagram of the second assembly step of the electronic expansion valve;

13 is a schematic diagram of the third assembly step of the electronic expansion valve;

FIG. 14 is a schematic cross-sectional structure diagram of another embodiment of the electronic expansion valve.

specific embodiment

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

1 is a schematic block diagram of an embodiment of a refrigeration system. In this embodiment, the refrigeration system includes an air conditioning system and a battery cooling system, and the air conditioning system includes a compressor 100 , a condenser 200 , a first electronic expansion valve 1 and an evaporator 300 When the air-conditioning system is working, the refrigerant is compressed into a high-temperature and high-pressure refrigerant by the compressor 100, and the high-temperature and high-pressure refrigerant is cooled by the condenser 200 to become a normal temperature and high pressure refrigerant, and the normal temperature and high pressure refrigerant passes through the first electronic expansion valve. 1. Enter the evaporator 300; since the pressure of the normal temperature and high pressure refrigerant decreases after passing through the first electronic expansion valve 1, the refrigerant will vaporize and become a low temperature refrigerant, and the low temperature refrigerant will absorb a large amount of heat through the evaporator 300 It becomes the refrigerant and returns to the compressor 100; the battery cooling system includes a thermal management component, and the refrigerant in the air conditioning system exchanges heat with the working medium of the battery cooling system in the thermal management component.

2 is a schematic structural diagram of a specific implementation manner of a thermal management assembly. In this embodiment, the thermal management assembly 400 includes a heat exchanger 500 and a second electronic expansion valve 2 , and the heat exchanger 500 and the second electronic expansion valve 2 are combined As a whole, the refrigerant in the air conditioning system and the working medium of the battery cooling system conduct heat exchange in the heat exchanger 500. In this embodiment, the structure of the first electronic expansion valve 1 and the structure of the second electronic expansion valve 2 are the same , the first electronic expansion valve 1 and the second electronic expansion valve 2 are collectively referred to as electronic expansion valves for description. Of course, the structures of the first electronic expansion valve and the second electronic expansion valve can also be different, or the battery cooling system does not use an electronic expansion valve, as long as one of the first electronic expansion valve and the second electronic expansion valve is the same as the electronic expansion valve of the technical solution The same structure is within the protection scope of this technical solution.

3 to 6 , the electronic expansion valve 1 includes a control part 10 , a valve body 20 , a valve part 40 and a sensor 50 , the valve part 40 is fixed to the valve body 20 , the sensor 50 is electrically connected to the control part 10 , and the sensor 50 is connected to the valve body 20 is fixed, and the control part 10 and the valve body 20 are fixedly arranged. In this embodiment, the control part 10 and the valve body 20 are fixed by screws 70, or they can be fixed by means of snapping or bonding. In this way, the sensor 50 is integrated into the electronic expansion valve 1, and the limit sensor 50 of the valve body 20 does not need to be separately provided with a mechanical connection part for the limit sensor, so the structure is simpler, and the pins of the sensor and the control part 10 are used at the same time. Connection, no separate wiring harness is required to transmit the sensor signal to the controller. The electronic expansion valve 1 further includes a first sealing member 60, and the first sealing member 60 is disposed between the control portion 10 and the valve body 20 to enhance the sealing between the control portion 10 and the valve body 20; the electronic expansion valve further includes a first sealing member 60. The groove 103, the first groove 103 is disposed in the control part 10 or the valve body 20, and the first sealing member 60 is accommodated in the first groove 103 for positioning or limiting the first sealing member.

5 to 6 , the valve body 20 includes a first inlet 21 , a first outlet 23 and a first passage 27 , wherein the first inlet 21 and the first outlet 23 can communicate through the first passage 27 ; the valve body 20 further includes The second inlet 22 , the second outlet 24 and the second passage 28 , the second inlet 22 and the second outlet 24 can communicate through the second passage 28 ; the first passage 27 is not communicated with the second passage 28 . 3 and 4, the first inlet 21 and the second outlet 24 are arranged on the same side of the valve body 20, and the second inlet 22 and the first outlet 23 are arranged on the same other side of the valve body 20, so that the electronic expansion valve is When the heat exchanger is integrated or assembled, the first outlet 23 of the electronic expansion valve is connected to the inlet of the heat exchanger 500, and the outlet of the heat exchanger is connected to the second inlet 22 of the electronic expansion valve, which is convenient for the heat exchanger and the electronic expansion valve. Corresponding installation; in addition, the first inlet 21, the second inlet 22, the first outlet 23 and the second outlet 24 can be arranged on the same side of the valve body 20, or can be arranged on different sides of the valve body 20, according to the electronic expansion valve Design according to the needs of practical application. In the technical solution, according to the flow direction of the working medium, the first outlet is located upstream of the inlet of the heat exchanger, and the second inlet is located downstream of the outlet of the heat exchanger.

Referring to FIG. 9 , the valve body 20 further includes a first installation part 25 and a second installation part 26 , the first installation part 25 has a first cavity 250 , the second installation part 26 has a second cavity 260 , and the first cavity 250 can be connected with the first cavity 250 . A channel 27 is communicated with, the second cavity 260 is communicated with the second channel 28, the valve body 20 includes a first side wall 204, the opening of the first cavity 250 and the opening of the second cavity 260 are formed on the first side wall 204, or The first side wall is formed with a first cavity 250 and a second cavity 260, or the opening of the first cavity and the opening of the second cavity are located on the first side wall, or the opening of the first cavity and the opening of the second cavity are located in the valve. Therefore, in this embodiment, the first inlet 21 and the second outlet 24 are located on the same side of the valve body 20, the second inlet 22 and the first outlet 23 are located on the same side of the valve body 20, and the first cavity 250 is located on the same side of the valve body 20. The opening and the second cavity 260 are located on the same side of the valve body 20, and the above three sides are different sides of the valve body, which is beneficial to avoid interference, miniaturize the valve body, and improve the utilization rate of the valve body.

7, the valve component 40 includes a valve seat 41, a valve core 42, and a rotor assembly 43. The rotor assembly 43 can drive the valve core 42 to move, so that the valve core 42 can move relative to the valve seat 41. The valve seat 41 has a valve port 44, The valve port 44 communicates with the first channel 27 located on both sides of the valve port 44 , and the valve core 42 changes the flow cross-sectional area of the first channel at the valve port 44 by approaching and moving away from the valve port 44 , thereby being able to form a throttling at the valve port 44 .

In this embodiment, the valve component 40 further includes a connecting piece 45 and a sleeve 46, the sleeve 46 covers the outer circumference of the rotor assembly 43, the sleeve 46 is welded and fixed to the connecting piece 45, and the valve seat 41 is fixedly connected to the connecting piece 45, that is, The sleeve 46 and the valve seat 41 are connected by the connector 45, which is beneficial to simplify the mold, make the mold miniaturized, and at the same time facilitate the forming process of the valve seat; of course, the connector 45 can also be integrally formed with the valve seat 41, so there is no need to carry out Connection settings for both.

In this embodiment, the connecting piece 45 is formed with a flange portion 411. The flange portion 411 includes two surfaces, namely the lower end surface 413 of the flange portion and the upper end surface 412 of the flange portion. The upper end surface 412 of the flange portion faces toward On the side where the sleeve 46 is located, the lower end surface 413 of the flange portion faces the side where the valve body 20 is located.

At least part of the valve member 40 is accommodated in the first cavity 250 , and the valve member 40 is fixedly arranged with the first mounting portion 25 . Specifically, referring to FIG. 9 , the first mounting portion 25 includes a first stepped surface 252 and a first side portion 253 , and along the axial direction of the first mounting portion 25 , the first side portion 253 is closer to the valve body than the first stepped surface 252 The first step surface 252 is substantially perpendicular to the axial direction of the main body of the first mounting portion 25 , the first side portion 253 is parallel to the axial direction of the main body of the first mounting portion 25 , and the first mounting portion 25 is The main body refers to the portion formed with the first cavity, the surface of the first side portion 253 is formed with threads, and the threads formed on the surface of the first side portion 253 are defined as internal threads.

7 , 9 and 12 , the lower end surface 413 of the flange portion is in contact with the first stepped surface 252 , and the distance from the first stepped surface 252 to the outer surface of the valve body 20 where the opening of the first cavity is formed is preliminarily set. , the length of the valve seat 41 entering the first cavity 250 can be controlled. The electronic expansion valve 1 further includes a first compression nut 641, the first compression nut 641 has a first through hole 6411, and the outer periphery of the first compression nut is formed with threads, which define the outer periphery of the first compression nut as the outer thread. Thread 6412, the sleeve 46 passes through the first through hole 6411, the first compression nut 641 is arranged on the outer circumference of the connecting piece 45, the lower end surface of the first compression nut is in contact with the upper end surface 412 of the flange part, and the first compression nut 641 is rotated. The compression nut 641, the outer thread of the first compression nut 641 acts with the inner thread of the first side portion 253, the first compression nut 641 presses the flange portion 411 against the valve body 20, the valve member 40 and the valve body 20 It is relatively fixed, which is beneficial to ensure that the relative position of the valve component 40 and the valve body 20 remains unchanged, and the installation is convenient and simple.

The electronic expansion valve 1 further includes a second sealing member 540, and the first mounting portion 250 of the valve body 20 may further include a second stepped surface 251. The second stepped surface 251 is substantially parallel to the first stepped surface 252, and the second stepped surface 251 Relative to the first stepped surface 252 away from the first side wall 204 , that is, the second stepped surface 251 is disposed closer to the bottom of the first cavity 250 than the first stepped surface 252 , and the second sealing member 540 is disposed between the second stepped surface 251 and the bottom of the first cavity 250 . The distance between the first step surface 252 and the second step surface 251 can be set between the lower end surfaces 413 of the flange portion according to the size of the second sealing member 540 and the sealing requirements, which is beneficial to avoid the effect on the second sealing member 540. The pressing force is too large or too small, resulting in poor sealing effect of the second sealing member 540, so as to enhance the sealing between the first mounting part 25 and the valve part 40, reduce the risk of leakage of the working medium, and improve the electronic expansion Valve tightness. Alternatively, the first stepped surface 252 is provided with a second groove, the second sealing member 540 is disposed in the second groove of the first stepped surface 252, and the lower end surface 413 of the flange portion is in contact with the second sealing member 540 to seal the second sealing member 540. The sealing member 540 is pressed tightly, and the first step surface 252 is provided with a second groove, which facilitates the installation of the second sealing member 540, and can also enhance the sealing between the first installation portion 25 and the valve seat 41, reducing the leakage of the working medium. risk, thereby improving the sealing performance of the electronic expansion valve. It can be known that the second groove can also be arranged on the side of the flange part; the depth of the second groove is smaller than the thickness of the second seal, and the second seal is pressed tightly between the valve part and the valve body.

7 to 11 , the control part 10 includes a cover body 11 , an electric control board 12 and a stator assembly 13 , the electric control board 12 is electrically and/or signally connected to the stator assembly 13 , the control part 10 has a control cavity 112 , and the cover body 11 forms at least part of a control cavity 112, the control cavity 112 is arranged in communication with the second cavity, the electronic control board 12 is installed in the control cavity 112, and the electronic control board 12 can output a control signal to the stator assembly 13 or transmit the control signal to the stator assembly 13. The cover body 11 and the stator assembly 13 are integrally formed by injection molding, specifically, the stator assembly 13 includes a coil and a first pin 119, and the stator assembly 13 is electrically connected and/or signally connected to the electronic control board 12 through the first pin 119 , the cover body 11 is formed by injection molding with the coil, the first pin 119, etc. as inserts. The other end of the first pin 119 is plugged and fixed with the electronic control board 12 and can be electrically and/or signally connected. The control part 10 further includes an interface part 115 through which the electronic expansion valve is electrically and/or signally connected to the outside world. The interface part 115 is fixed to the cover body 11 by injection molding; The installation cavity 1151, the second pin 116 extends into the installation cavity, the second pin 116 is fixed with the cover body 11 by injection molding, the first end of the second pin 116 extends into the control cavity 112, the second end of the second pin 116 Protruding into the installation cavity 1151, at least part of the middle of the second pin 116 is injection-molded and fixed to the cover body 11, the first end of the second pin 116 is plugged or crimped to the electronic control board 12, and the first end of the second pin 116 is fixed. The two ends extend into the installation cavity 1151 , and the electronic control board 12 can be connected to the external power supply and/or control signal of the electronic expansion valve through the second pin 116 . The electronic control board 12 has a first jack 122 and a second jack 125, the first pin 119 is inserted into the first jack 122, the second pin 116 is inserted into the second jack 125, the first pin 119, the second jack 125 The pins 116 and the electric control board 12 can be connected by welding or by crimping. The electric control board 12 is relatively fixed to the cover body 11 through the first pins 119 and the second pins 116 . The stator assembly 13 and the cover body 11 are integrally assembled with the electronic control board 12 by injection molding to form the first part of the control part, wherein the stator assembly 13 is sleeved on the outer periphery of the rotor assembly 43 .

Referring to FIGS. 7 , 8 , 11 and 14 , along the axial direction of the second mounting portion 26 , the opening direction of the second cavity 260 is defined as the upward direction, and the direction opposite to the opening direction of the second cavity 260 is defined as the downward direction. The surface above the board 12 is the first surface 123 of the electric control board, and the side opposite to the first surface 123 of the electric control board is the second surface 124 of the electric control board, or in other words, along the axis direction of the second mounting portion 26 , the second side 124 of the electric control board is closer to the first side wall 204 than the first side 123 of the electric control board. It can be known that the electronic components of the electric control board 12 are arranged on the first side of the electric control board or the electric control board. the second side. Along the axial direction of the second mounting portion 26, at least part of the electric control board 12 is disposed between the second mounting portion 26 and the cover body 11; The second surface 124 of the electric control board faces the first side wall 204 provided with the second mounting portion 26 and the sensor 50 , or in other words, the cover body 11 is not provided between the electric control board 12 and the valve body 20 , and the electric control board 12 Installed and fixed with the first pin 119 and the second pin 116, the electric control board 12 is put into the control cavity 112 from the side of the cover corresponding to the valve body 20, and the electric control board 12 is connected with the first pin 119 and the second pin 119. The pin 116 is crimped, which is beneficial to the installation of the electric control board and the assembly of the electronic expansion valve. In addition, the electronic control board 12 and the stator assembly 13 are arranged on the same side of the first side wall 204, and the structure of the electronic expansion valve is relatively compact.

In this technical solution, the sensor 50 is fixedly arranged with the valve body 20 , the sensor 50 is fixed with the second mounting portion 26 , and part of the sensor 50 extends into the second cavity 260 .

In the technical solution, the sensor 50 includes a body 51, a sensing head 52 and a connecting portion 53, the sensing head 52 and the body 51 are fixedly arranged, the sensing head 52 is located in the second channel 28 or the second cavity 260, and the sensing head 52 can sense the second channel 28 or relevant parameters of the working medium in the second chamber 260, such as the temperature and/or pressure of the working medium. The electronic control board 12 and the sensor 50 are electrically and/or signally connected through the connecting portion 53 . The end and the second end of the body are located at different ends of the body. One end of the connecting portion 53 is encapsulated in the body 51 and is electrically and/or signally connected to the sensing head 52. The other end of the connecting portion 53 is exposed to the body 51 and is connected to the electric control board. 12 for electrical connection and/or signal connection. Since the electronic control board 12 is disposed in the control cavity 112 , at least part of the connection portion 53 is located in the control cavity 112 .

Referring to FIG. 8 , the second surface 124 of the electric control board is provided with a first abutting portion 121 ; the first abutting portion 121 includes a conductive layer formed on the second surface 124 of the electric control board, wherein the conductive layer may be plated Tin layer, electroless nickel plating, immersion gold, etc., or a conductive metal sheet that is fixedly connected to the electric control board; the first abutting part 121 is electrically connected to the circuit of the electric control board, and the connecting part 53 of the sensor is connected to the first abutting part 121 abuts and can be electrically connected or/and signally connected, or the connecting portion 53 is fixedly connected to the first abutting portion and is electrically or/and signally connected; the sensor 50 and the electronic control board 12 thus arranged pass through the first abutting portion 121 abuts, it is not necessary to set a plug hole on the electric control board 12, which is conducive to arranging electrical components on the first surface of the electric control board, which is beneficial to improve the utilization rate of the first surface of the electric control board, and does not require By welding, the assembly process is simpler.

Specifically, in this embodiment, the sensor includes five connection parts 53, which is beneficial to improve the connection reliability between the connection parts and the electric control board. The sensor 50 also includes a conductive plate 54, which is made of conductive material. 54 is encapsulated in the body 51, and the first end of the connecting portion 53 is fixedly connected to the conductive plate 54, including surface-to-surface contact welding, post-plug welding, or interference plug-in fixing and electrical connection and/or signal connection; induction head 52 is welded fixedly connected or plugged with the conductive plate 54, and the connection portion 53 is electrically and/or signally connected to the induction head 52 through the conductive plate 54, thus providing support for the connection portion and the induction head through the conductive plate. Of course, the position of the connecting portion and the conducting plate can also be defined by the body, that is, the connecting portion is in contact with the conducting plate and is electrically and/or signally connected, and the connecting portion and the conducting plate are fixedly connected through the body; the position of the conducting plate and the induction head is defined by the body , that is, the conductive plate is electrically and/or signally connected to the induction head, and the conductive plate and the induction head are fixedly connected through the body. Of course, if the sensor only includes one connection part, the conductive plate may not be provided, the connection part is electrically and/or signally connected to the induction head, the connection part is fixedly connected to the induction head or the connection part is fixedly connected to the induction head through the body; in this way, the sensor structure is simpler.

In this embodiment, the connecting portion 53 is an elastic element, such as a spring, a shrapnel, a leaf spring, etc. In this embodiment, the connecting portion 53 is used as a spring for description. The connection part 53 is elastically deformed, or the length of the elastic element between the electric control board and the sensor is smaller than the length of the elastic element in the natural state, which is conducive to the contact between the connection part 53 and the electric control board 12. more reliable. The body is formed with an accommodating cavity, a part of the connecting part is accommodated in the accommodating cavity, the other part of the connecting part is exposed to the body, one end of the connecting part 53 exposed from the body is in contact with the conductive layer of the electronic control board 12, and the opposite end of the connecting part is connected to the sensor. The conductive plate or the induction head is abutted, which relatively reduces welding and simplifies the assembly process. The connection part 53 abuts the electric control board 12, and the electric control board 12 is deformed. In order to eliminate the force of the connection part 53 on the electric control board 12, and at the same time strengthen the stability of the electric control board 12, the cover body 11 is provided with a support part 101, The support portion 101 protrudes from the inner wall 113 of the cover relatively, and protrudes toward the electric control board 12. Along the axis direction of the second mounting portion 26, the support portion 101 is located above the electric control board 12. One side 123 is approximately vertical, the support part 101 is in contact with the first surface 123 of the electric control board, the support part 101 and the connection part 53 are located on both sides of the electric control board 12 respectively, the support part 101 is used to offset the effect of the connection part 53 on the electric control board The elastic force of the board 12. In this embodiment, the electric control board 12 includes five first abutting parts 121, and the cover body 11 includes two supporting parts 101. The first abutting parts 121 surround a first area, and the supporting parts 101 It is supported at a position close to the center of the first area, so as to facilitate the relative stability of the electric control board 12 .

The main body 51 further includes a limiting portion 512 , which is a non-rotating body, and the limiting portion 512 includes a limiting surface 535 , which is distributed along the circumferential direction of the limiting portion 512 ; correspondingly, the second mounting portion 26 includes The mating portion 264 includes a mating surface, which is formed on the sidewall of the second mounting portion. After the sensor is assembled with the valve body, the mating surface and the limiting surface are in abutment to limit the rotation of the sensor relative to the valve body and ensure that the sensor is rotated relative to the valve body. The position relative to the valve body, thereby ensuring the position of the sensor relative to the electronic control board. Specifically, please refer to 9 and FIG. 10 , the body 51 further includes a main body portion 511 , and the conducting plate 54 is fixedly arranged with the main body portion 511 . In the axial direction of the two mounting parts 26, the main body part 511 is closer to the electronic control board 12 than the limiting part 512; part. Specifically, the limiting portion 512 includes a limiting surface 535, a lower end surface 534 of the limiting portion, and an upper end surface 533 of the limiting portion. The limiting surface 535 is distributed along the circumferential direction of the limiting portion 512, and along the axial direction of the sensor, the limiting The lower end surface 534 of the positioning portion is located on one side of the limiting portion 512 , and the upper end surface 533 of the limiting portion is located on the other side of the limiting portion 512 . The limiting surface 535 includes an arc surface and a flat surface. It can be known that when the limiting portion 512 is located in the second cavity 260, since the limiting portion is a non-rotating body, the sensor cannot rotate. The structure of the limiting portion can be various, as long as the sensor can be prevented from rotating, such as a square, oval or other shape of the limiting portion. The second mounting portion 26 includes a third stepped surface 263 , an abutting surface 262 , and a second side portion 265 . Along the axial direction of the second mounting portion 26 , the mating surface 264 is located between the third stepped surface 263 and the abutting surface 262 . , the third stepped surface 263 is closer to the first side wall 204 than the abutting surface 262, and the second side portion 265 is closer to the first side wall 204 than the third stepped surface 263; the third stepped surface 263, the abutting surface 262 and the The axial directions of the two mounting portions 26 are substantially perpendicular, the mating surface 264 and the second side portion 265 are substantially parallel to the axis of the second mounting portion 26 , the second side portion 265 has internal threads, and the lower end surface 534 of the limiting portion is in contact with the contact surface 262 abuts, and can control the length of the sensor 50 entering the second cavity 260; the electronic expansion valve includes a second compression nut 541, the second compression nut 541 is sleeved on the main body 511, and the lower end surface of the second compression nut is connected to the limit The upper end surface of the position part abuts, the outer circumference of the second compression nut is formed with threads, the second mounting part includes a threaded part, and the threaded part is arranged farther from the bottom of the second mounting part than the matching part, and is located on the outer periphery of the second compression nut 541 Under the action of the thread of the second mounting portion 265 and the thread portion of the second side portion 265 of the second mounting portion, the second pressing nut 541 presses the limiting portion 512 to connect the sensor 50 and the valve body 20 .

In this embodiment, the electronic expansion valve further includes a third sealing member 520. The third sealing member is disposed between the bottom of the second mounting portion and the sensor, so as to form a sealing structure between the sensor and the valve body to prevent the second passage The working medium inside enters the control chamber through the gap between the sensor and the valve body. The third sealing member 520 is disposed at the bottom of the second mounting portion and is limited by forming a mating surface. The distance from the abutting surface to the bottom of the second mounting portion is smaller than the thickness of the third sealing member. The lower end surface 534 of the limiting portion is connected to the first The three sealing members 520 are in contact, and the third sealing member 520 is pressed against the bottom of the second mounting portion. By setting the distance between the abutting surface and the bottom of the second mounting portion, the compression amount of the third sealing member is controlled, which is beneficial to avoid the effect of When the pressing force of the third sealing member 520 is too large or too small, resulting in poor sealing effect of the third sealing member 520, the sealing between the second mounting part 26 and the sensor 50 is enhanced, and the leakage of the working medium to the control device is reduced. Therefore, the sealing performance of the electronic expansion valve is improved and the risk of internal leakage is reduced; it can be known that the third seal can also be arranged between the limit surface and the valve body, that is, the third seal can be arranged on the limit surface or the valve body. The third sealing member is clamped in the third groove, and the limiting surface of the third groove or the valve body is not provided to press the third sealing part. Alternatively, a third groove or a stepped portion is formed on the lower end surface of the limiting portion of the sensor; or, a third groove is formed on the abutting surface of the second mounting portion, and the third sealing member is clamped in the third groove, The depth of the third groove is smaller than the thickness of the third seal, and the third seal is pressed between the lower end surface of the limiting portion of the sensor and the valve body.

In this embodiment, referring to FIG. 11 , the cover body 11 further includes a first ring portion 117 , and the first ring portion 117 is formed close to the outer edge of the cover body 11 of the control portion, or the first ring portion 117 surrounds the outer periphery of the control cavity, In one embodiment of the present invention, after the cover body and the valve body are assembled, the first ring portion 117 abuts against the first side wall 204 of the valve body; the electronic expansion valve further includes a first sealing member 60, the first sealing member surrounds the control The outer circumference of the cavity is arranged, and the first sealing member 60 is arranged between the first side wall 204 and the first ring portion 117. Further, the cover body 11 presses the first sealing member 60 against the valve body 20, which can strengthen the cover body The sealing between 11 and the valve body 20 reduces the leakage of the working medium to the outside of the electronic expansion valve through the connection part of the cover body and the valve body, or the external medium enters the electronic expansion valve through the connection part of the cover body and the valve body. For the outer seal of the electronic expansion valve, in an embodiment of the present invention, the first ring portion 117 is disposed close to the peripheral side of the cover body 11 . Specifically, please refer to FIG. The opening of the cavity 250, the opening of the second cavity 260 and the first ring portion 117 are projected onto a plane perpendicular to the perimeter, forming the first projection, the second projection, and the third projection, and the first projection and the second projection are located in the third projection. In the area surrounded by the projection, that is, the first sealing member is located on the periphery of the first cavity opening and the second cavity opening, so that after the first ring portion is relatively fixed to the valve body, the external working medium can be prevented from entering the control cavity. In another embodiment, please refer to FIG. 14 , because the external medium is mainly prevented from entering the control chamber, resulting in damage to the electronic control board, in this embodiment, along the axis direction of the second mounting portion 26 , the first sealing member 60 surrounds the second The opening of the cavity 260 is provided. After the first ring portion is connected to the valve body, the cover body presses the first sealing member against the valve body, so that the sealing of the control chamber can be achieved after the first ring portion and the valve body are relatively fixed. Part of the first seal is arranged between the opening of the first cavity and the opening of the second cavity, and can also prevent the working medium entering the first cavity from entering the control cavity, and no first seal is provided on the periphery of the opening of the first cavity; thus It is beneficial to miniaturize the first seal. The first pin 119 and the second pin 116 are integrally injected with the cover body 11. When assembling the electric control board 12, the electric control board 12 is pressed against the first pin 119 and the second pin 116. A pin 119 and a second pin 116 are fixed by crimping or welding, the opening of the control cavity of the cover body faces the valve body, the electric control board is placed in the control cavity from the opening of the control cavity of the cover body, and the cover body 11 and the stator assembly One piece. Of course, the cover body 11 also includes a first shell and a second shell, the first shell is formed separately, and the second shell is integrally formed with the stator assembly, so that the opening of the control cavity faces away from the valve body, and the electronic control board is placed in the control cavity from the opening of the control cavity. The cavity is fixedly connected with the first pin and the second pin, and then the first shell and the second shell are fixed and sealed, such as by laser welding; the second shell includes a first ring portion, and the second shell is formed with a a communication hole, the first ring part surrounds the outer periphery of the first communication hole, the first sealing element surrounds the outer periphery of the first communication hole, and the second shell presses the first sealing element against the valve body.

In this embodiment, the electronic expansion valve further includes a first groove 103. The first groove 103 may be disposed in the first ring portion 117; the first groove 103 may also be disposed in the valve body 20, that is, the wall of the first groove. It is a part of the first side wall 204, or the first side wall 204 includes the wall of the first groove, the first groove 103 is arranged opposite to the first ring portion 117; the first sealing member 60 is arranged in the first groove 103 , the depth of the first groove is less than the height of the first sealing member, and the first sealing member 60 is squeezed when the cover body 11 and the valve body 20 are fixed, so as to realize the sealing between the valve body 20 and the cover body 11 . In addition, referring to FIG. 11 , the electronic expansion valve may further include at least one card groove 105 , the card groove and the first groove 103 are jointly disposed on the first ring portion of the valve body or the cover body, and the card groove 105 is connected with the first groove 103 Correspondingly, the first sealing member 60 further includes at least one protrusion 601, and the protrusion 601 of the first sealing member is in an interference fit with the clamping groove 105. When the first groove 103 is arranged on the first ring portion of the cover body 11 117, the first sealing member 60 can be prevented from falling off when the control part 10 and the valve body 20 are assembled, which is convenient for installation.

Referring to FIGS. 11 and 13 , the cover body 11 further includes limit pins 102 , and the number of limit pins is greater than or equal to two. In this embodiment, the cover body includes two limit pins 102 , the limit pins 102 and the first ring Part 117 is fixedly connected, the limit pin 102 protrudes toward the valve body 20 relative to the first ring part 117 , the limit pin 102 is arranged close to the outer edge of the first ring part 117 , or the limit pin is located outside the first groove; the valve body 20 Including positioning holes 202, the number of positioning holes 202 is the same as the number of limit pins 102, the limit pins 102 are inserted into the positioning holes 202, and the relative position of the control part 10 and the valve body 20 is limited, which can prevent the control part 10 during the assembly process. The offset relative to the valve body 20 makes the fixed connection between the control part 10 and the valve body 20 accurate and easy to assemble. It can be known that the limit pins can also be arranged on the valve body, and the corresponding limit holes are arranged on the cover body.

The electronic expansion valve further includes a fastening device 70, which can be a bolt or a screw. The cover body 11 includes a second communication hole 104, and the second communication hole 104 is disposed near the outer edge of the first ring portion 117, that is, the second communication hole The hole 104 penetrates the first ring portion 117 , the valve body 20 includes a threaded hole 203 , and the fastening device 70 passes through the second communication hole 104 and the threaded hole 203 to fixedly connect the control portion 10 and the valve body 20 . The number of communication holes is greater than or equal to two, and the number of threaded holes is the same as that of the second communication holes, so as to press the first seal 60 tightly, so that the control part 10 and the valve body 20 can be integrated into a whole, and it can ensure The sealing performance, waterproof and dustproof performance between the valve body 20 and the control part 10 can effectively prevent the intrusion of external water or dust and the leakage of the internal working medium, and play the role of overall sealing.

11 to 13, a manufacturing method of an electronic expansion valve, the electronic expansion valve includes a control part, a valve body, a valve component and a sensor, the control part includes a cover body, a stator assembly and an electric control board, and the cover body and the stator assembly pass through Injection molding as a whole, the manufacturing method of the electronic expansion valve includes the following steps:

a1. Assembly of the control unit, including

The first part of the control part is formed by inserting the stator assembly, the first pin and the second pin as inserts to form the first part including the cover body;

The assembly of the electric control board and the first part, the electric control board is fixedly connected with the first pin and the second pin;

a2. Fix the valve components to the valve body;

a3. Securely connect the sensor to the valve body;

a4. Assemble the control part formed in step a1 with the components formed in steps a2 and a3.

The order of the above steps a1, a2, and a3 is adjustable, and a4 is after steps a1, a2, and a3. Before step a2, the assembly of valve components is also included. The valve components include a valve seat, a valve core, a sleeve, a connecting piece and a rotor assembly. The rotor assembly and the valve core are assembled inside the sleeve. The sleeve and the connecting piece are welded and fixed. The seat and the connector are welded and fixed.

Before step a3, it also includes forming the sensor. The sensor includes a connecting part, a conductive plate, a body and a sensing head, the connecting part includes an elastic element, the elastic element is in contact with the conducting plate, and the sensing head is in contact with the conducting plate. The sensor head is a sensor that is formed by injection molding and includes a body.

Step a2 includes: placing the second seal in the first cavity, placing the valve part in the first cavity, and fixing the valve part and the valve body through the first compression nut.

Step a3 also includes placing the third seal in the second cavity, limiting the position of the sensor and the matching part of the valve body, placing the sensor in the second cavity of the valve body, and pressing the sensor through the second compression nut. Fixed setting with valve body.

Step a4 further includes: placing the first sealing member in the first groove, inserting the limiting pin into the positioning hole of the valve body, and fixing the control part and the valve body through the fastening device.

Step a4 includes: the sensor is electrically and/or signally connected to the electric control board, the connection part of the sensor is abutted with the first abutting part of the electric control board, and the elastic element of the electric control board compresses the elastic element of the connection part of the sensor to deform to set the length .

The electronic expansion valve includes a control part, a valve body, a valve component and a sensor, the control part includes a cover body, a stator assembly and an electric control board, the cover body includes a first shell and a second shell, and the second shell is connected with the all The stator assembly is integrally formed, a control cavity is formed between the first shell and the second shell, and the manufacturing method of the electronic expansion valve includes the following steps:

a1. Assembly of the control unit, including

The forming of the first part of the control part includes the stator assembly, the first pin and the second pin as insert injection molding to form the first part including the second shell;

The installation of the electric control board and the first part; the electric control board is fixedly connected with the first pin and the second pin;

the first shell and the second shell are fixedly connected;

a2. Fix the valve components to the valve body;

a3. Securely connect the sensor to the valve body;

a4. Assemble the control part formed in step a1 with the valve body.

For the electronic expansion valve manufactured in this way, since there are no restrictions on the assembly steps of the valve components and the sensor assembly, the degree of freedom in the design of the assembly process is relatively large.

It should be noted that the above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention. Although the present specification has been described in detail with reference to the above embodiments, those of ordinary skill in the art It should be understood that those skilled in the art can still modify or equivalently replace the present invention, and all technical solutions and improvements 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 (10)

1. The electronic expansion valve comprises a valve body, a valve component, a control part and a sensor, wherein the valve body comprises a th mounting part and a second mounting part, the valve body is provided with a th channel and a second channel, the th channel is not communicated with the second channel, a th mounting part is provided with a th cavity, the second mounting part is provided with a second cavity, the th cavity can be communicated with the th channel, the second cavity is communicated with the second channel, an opening of the th cavity and an opening of the second cavity are positioned on the same side of the valve body, an opening of the th cavity and an opening of the second cavity are positioned on the th side wall of the valve body, the valve component is fixedly connected with the th mounting part, the sensor is fixed with the second mounting part, the sensor is in signal connection with the electronic control board, the control part comprises an electronic control cover body board, a connecting part and a cover body component, the connecting part is fixed with the electronic expansion valve body for electrically connecting and/or signal connection, the control part comprises a control part, the control part 8945 of the valve body and the electronic expansion valve body, the control part is arranged around the second cavity, and the electronic control part 8945 is arranged around the second cavity and the electronic expansion valve body.
2. 2. The electronic expansion valve according to claim 1, wherein a th portion comprising the cover body is formed by injection molding by using the stator assembly as an insert, the opening of the control chamber faces the valve body, the cover body comprises a th ring portion, a 0 th ring portion surrounds the periphery of the control chamber, a 1 th ring portion is formed near the outer edge of the control portion, a 4 th groove is formed on the 2 th ring portion or the 3 th side wall, a 5 th groove is formed on the 6 th chamber opening and the periphery of the second chamber opening, the 7 th sealing member is limited on the th groove, the th groove has a depth smaller than the height of the th sealing member, the th sealing member is pressed against the th ring portion by the th side wall, and the th side wall abuts against the th ring portion.
3. 3. The electronic expansion valve according to claim 1, wherein a th portion comprising the cover body is formed by injection molding by using the stator assembly as an insert, the cover body comprises a th ring portion, the 0 th ring portion is formed near the outer edge of the control portion, the 1 th side wall or the 2 th ring portion is formed with a 3 rd groove, the 4 th groove is located at the outer periphery of the opening of the second chamber, at least a part of the 5 th groove is located between the 6 th chamber opening and the second chamber opening, the 7 th sealing member is limited at the th groove, the depth of the th groove is smaller than the height of the th sealing member, the th side wall presses the th sealing member against the th ring portion, and the th side wall abuts against the th ring portion.
4. 4. The electronic expansion valve according to claim 1, wherein the cover comprises a th shell and a second shell, a th portion comprising the second shell is formed by injection molding by using the stator assembly as an insert, an opening of the control cavity faces away from the valve body, the th shell and the second shell are fixed in a sealing manner, the second shell is provided with a th communicating hole, the th sealing member surrounds the periphery of the th communicating hole, the second shell presses the th sealing member against the valve body, the second shell comprises a 635 th ring portion, the th ring portion surrounds the periphery of the th communicating hole, the th ring portion or the 359 th side wall is provided with a th groove, the th sealing member is limited in the th groove, the th groove has a depth smaller than the height of the th sealing member, the th side wall presses the th sealing member against the second ring portion 5, and the th ring portion abuts against the 5857324 th ring portion.
5. 5. The electronic expansion valve according to claim 2, 3 or 4, wherein the cover comprises a stopper pin, the stopper pin is located outside the th groove, the number of the stopper pins is greater than or equal to two, the valve body comprises positioning holes, the number of the positioning holes is the same as the number of the stopper pins, and the stopper pin is inserted into the positioning holes.
6. 6. The electronic expansion valve according to claim 5, further comprising a fastening means, wherein the cover comprises a second communication hole formed in the th ring portion, the second communication hole is disposed closer to an outer edge of the cover than the stopper pin, the valve body comprises a threaded hole, and the fastening means passes through the second communication hole and is threadedly coupled to the threaded hole.
7. 7. The electronic expansion valve according to claim 6, wherein the -th mounting portion comprises a -th stepped surface and a second stepped surface, and a second seal member is provided between the valve member and the valve body, the valve member comprises a connecting member formed with a flange portion formed with two faces, the second seal member is provided between a lower end face of the flange portion and the second stepped surface, and a lower end face of the flange portion abuts against the -th stepped surface, or the flange portion or the -th stepped portion is provided with a second groove, and the second seal member is provided in the second groove, and a depth of the second groove is smaller than a thickness of the second seal member, the electronic expansion valve comprises a -th compression nut, the -th compression nut is provided on an outer periphery of the connecting member, and a lower end face of the -th compression nut abuts against an upper end face of the flange portion.
8. 8. The electronic expansion valve of claim 7, wherein: the second mounting part comprises an abutting surface, a third sealing element is arranged between the sensor and the valve body, the sensor comprises a limiting part, the limiting part comprises a limiting surface, a lower end surface of the limiting part and an upper end surface of the limiting part, the third sealing element is arranged between the lower end surface of the limiting part and the bottom of the second mounting part, and the lower end surface of the limiting part abuts against the abutting surface; or the limiting part or the valve body is provided with a third groove, and the third sealing element is arranged in the third groove; the depth of the third groove is smaller than the thickness of the third sealing element, the electronic expansion valve comprises a second compression nut, the second compression nut presses the limiting part, and the lower end face of the second compression nut is abutted to the upper end face of the limiting part.
9. 9. The electronic expansion valve of claim 5, wherein the electronic expansion valve comprises at least slots, the slots and the groove are commonly disposed on the valve body or the ring portion, the slots are communicated with the groove, the sealing element comprises at least protrusions, and the protrusion of the sealing element is in interference fit with the slots.
10. 10, a thermal management assembly comprising an electronic expansion valve and a heat exchanger, the electronic expansion valve being fixedly connected to the heat exchanger, the electronic expansion valve comprising a valve body, a valve member, a control portion and a sensor, the valve body comprising a first mounting portion and a second mounting portion, the valve body having a st channel and a second channel, the st channel not being communicated with the second channel, the th mounting portion having a th cavity, the second mounting portion having a second cavity, the th cavity being capable of being communicated with the th channel, the second cavity being communicated with the second channel, an opening of the st cavity and an opening of the second cavity being located on the same side of the valve body, an opening of the th cavity and an opening of the second cavity being located on a th side wall of the valve body, the valve member being fixedly connected to the second mounting portion, the sensor being fixed to the second mounting portion, the sensor being in signal connection with the electronic control plate, the control portion comprising a cover, a plate, a stator assembly and a cover body, the electronic expansion valve body being fixedly connected to the mounting portion, the electronic expansion valve body being electrically connected to the control portion, the electronic expansion valve body, the control sealing portion being arranged around the control interface portion 8945, the control portion, the electronic expansion valve body, the control portion being arranged around the control portion, the control interface portion, the electronic expansion valve body, the;

    the valve body comprises an th inlet, a second inlet, a th outlet and a second outlet, the th channel is communicated with the th outlet and the th inlet, the second channel is communicated with the second outlet and the second inlet, the th outlet is communicated with the inlet of the heat exchanger, the second inlet is communicated with the outlet of the heat exchanger, and the inlet of the heat exchanger is communicated with the outlet of the heat exchanger through the third channel of the heat exchanger.

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