Electronic expansion valve, thermal management system and vehicle

Abstract

The electronic expansion valve comprises a valve body, a guide seat, a valve element assembly and a rotation stopping piece, the valve body is provided with an inner cavity with a valve port, the valve element assembly is arranged in the inner cavity in a reciprocating motion mode so as to open or close the valve port, the guide seat is fixed in the inner cavity of the valve body and divides the inner cavity into a first sub-cavity and a second sub-cavity, and the rotation stopping piece is arranged in the first sub-cavity and the second sub-cavity. And the through hole of the guide seat is communicated with the first sub-cavity and the second sub-cavity. The rotation stopping piece is fixed to the valve element assembly and located in the through hole, the rotation stopping piece is matched with the through hole to limit rotation of at least the part, matched with the valve port, of the valve element assembly, and a first gap between the rotation stopping piece and the through hole communicates with the first sub-cavity and the second sub-cavity. According to the electronic expansion valve, the closed space is opened or closed through sliding of the valve element in the inner cavity. Due to the fact that the closed space has certain pressure, the phenomenon of uneven pressure may occur in an inner cavity of the valve body. The first gap can balance the pressure in the inner cavity, and reliable work of the electronic expansion valve is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of electronic expansion valves, and in particular to an electronic expansion valve and a thermal management system and a vehicle including the electronic expansion valve. Background Art

[0002] Electronic expansion valves are used to adjust the pressure of a closed cavity by electric means. They are mainly used to reduce the pressure by releasing air when the pressure in a closed space is too high. For example, in a thermal management system, an electronic expansion valve can adjust the pressure in a closed space to ensure the reliable operation of the thermal management system.

[0003] The valve body of the electronic expansion valve is provided with an inner cavity, which is connected to the enclosed space, and the enclosed space is opened or closed by the movement of the valve core in the inner cavity. Since the enclosed space has a certain pressure, the inner cavity of the valve body may have uneven pressure. Utility Model Content

[0004] In view of the above technical problems, the purpose of the present application is to provide an electronic expansion valve capable of balancing the pressure in the inner cavity of the valve body, a thermal management system including the electronic expansion valve, and a vehicle including the thermal management system. Specifically, the following technical solutions are included:

[0005] In a first aspect, an embodiment of the present application provides an electronic expansion valve, comprising: a valve body, a guide seat, a valve core assembly, and a stopper. The valve body is provided with an inner cavity having a valve port, the valve core assembly is reciprocatably disposed in the inner cavity to open or close the valve port, the guide seat is fixed in the inner cavity of the valve body, and divides the inner cavity into a first sub-cavity and a second sub-cavity, and the guide seat comprises a through hole for connecting the first sub-cavity and the second sub-cavity. The stopper is fixed to the valve core assembly and is located in the through hole of the guide seat, the stopper is used to cooperate with the through hole to limit the rotation of at least the part of the valve core assembly that cooperates with the valve port, a first gap is left between the stopper and the through hole, and the first gap is used to connect the first sub-cavity and the second sub-cavity.

[0006] The electronic expansion valve core assembly of the present application can reciprocate in the inner cavity to open or close the valve port, thereby opening or closing the electronic expansion valve. A stopper is provided on the transmission rod, and the stopper cooperates with the through hole of the guide seat to limit the rotation of the transmission rod and the valve core.

[0007] There is a first gap between the anti-rotation part and the guide seat through hole of the electronic expansion valve of the present application, and the gap connects the first sub-cavity and the second sub-cavity, thereby eliminating the pressure difference that may be formed between the two sub-cavities and ensuring the reliable operation of the electronic expansion valve.

[0008] In one embodiment, the cross-sectional area of ​​the first gap is S1, the cross-sectional area of ​​the portion where the through hole cooperates with the anti-rotation member is S2, and the ratio of S1 to S2 ranges from 1:6 to 1:1.

[0009] In this embodiment, the ratio of the cross-sectional area of ​​the part where the through hole and the stop member cooperate to the cross-sectional area of ​​the first gap is 1:6-1:1. The first gap has enough space for the medium in the inner cavity to move, so that the two sub-cavities of the electronic expansion valve can quickly eliminate the pressure difference.

[0010] In one embodiment, one of the inner wall of the through hole and the outer peripheral surface of the rotation-stopping member includes at least one arc surface, and the other includes at least one plane, and at least a portion of the first gap is formed between the arc surface and the plane.

[0011] In this embodiment, the stopper is located in the through hole, and the inner wall of the through hole and the outer peripheral surface of the stopper cooperate with each other to limit the rotation of the stopper, and the two have at least one arc surface and one plane respectively, and there is a gap between the arc surface and the plane, and the gap forms at least part of the first gap.

[0012] In one embodiment, the stop member includes a main body and a stop portion, the through hole includes at least a first inner wall and a second inner wall, the first inner wall cooperates with the stop portion to limit the rotation of at least a part of the valve core assembly that cooperates with the valve port, the second inner wall includes an arc surface, the main body includes a plane, and at least a portion of a first gap is formed between the arc surface and the plane.

[0013] In this embodiment, the anti-rotation part of the anti-rotation member cooperates with the first inner wall of the through hole, and the anti-rotation member cannot rotate relative to the guide seat, so that the transmission rod and the valve core cannot rotate relative to the guide seat, thereby limiting the rotation of the valve core relative to the valve body, preventing the valve core from rotating and rubbing against the valve body to cause wear of the valve core, thereby affecting the sealing performance of the electronic expansion valve. At the same time, the body of the anti-rotation member includes a plane, and the second inner wall of the through hole includes an arc surface. There is a gap between the arc surface and the plane, and the gap is used to form a part of the first gap between the anti-rotation member and the through hole.

[0014] In one embodiment, the valve core assembly includes a valve core and a transmission rod, the valve core is located in the first sub-chamber, one end of the transmission rod is used to fix the valve core, and the other end passes through the through hole, and the transmission rod is used to drive the valve core to slide to open or close the electronic expansion valve.

[0015] In this embodiment, the valve core assembly includes a valve core and a transmission rod that are fixedly connected, and the transmission rod can reciprocate in the inner cavity to drive the valve core to move in the inner cavity. The position of the control valve core in the inner cavity can cover the valve port to open or close the electronic expansion valve.

[0016] In one embodiment, a second gap is formed between the through hole and the transmission rod, and the second gap is used to connect the first sub-cavity and the second sub-cavity.

[0017] In this embodiment, one end of the transmission rod passes through the through hole, and a second gap is formed between the transmission rod and the through hole, and the second gap can also connect the first sub-cavity and the second sub-cavity.

[0018] In one embodiment, the guide seat is provided with an extension portion, the extension portion is located in the through hole and extends toward the center of the through hole, and a second gap is formed between the extension portion and the transmission rod.

[0019] In this embodiment, the extension portion of the guide seat is disposed in the through hole and extends from the inner wall of the through hole toward the center of the through hole. One end of the transmission rod can pass through the extension portion, and a second gap is formed between the extension portion and the transmission rod to connect the first sub-cavity and the second sub-cavity.

[0020] In one embodiment, the maximum distance of the second gap along the radial direction of the guide seat is d1, the diameter of the portion of the transmission rod corresponding to the extension portion is d2, and d1≥1 / 3d2.

[0021] In this embodiment, the ratio of the maximum radial distance of the second gap along the guide seat to the diameter of the portion of the transmission rod corresponding to the extension portion is 3:1. The second gap has sufficient space for the medium in the inner cavity to move, and can also enable the two sub-cavities of the electronic expansion valve to quickly eliminate the pressure difference.

[0022] In one embodiment, an extension length of the extension portion is greater than a maximum distance of the first gap along the radial direction of the guide seat.

[0023] In this embodiment, the extension length of the extension portion toward the center of the through hole is greater than the distance of the first gap, which can control the flow rate of the heat exchange medium through the second gap and prevent excessive flow rate from affecting the normal operation of the components in the second sub-cavity.

[0024] In one embodiment, the stopper includes a body and a protrusion, the through hole includes a circular hole and at least one groove, the body is non-circular and is located in the circular hole, and the protrusion is embedded in at least one groove to limit the rotation of the valve core.

[0025] In this embodiment, the protruding portion of the stopper is embedded in the groove of the through hole, and the stopper cannot rotate relative to the guide seat, so that the transmission rod and the valve core cannot rotate relative to the guide seat, thereby limiting the rotation of the valve core relative to the valve body, preventing the valve core from rotating and rubbing against the valve body to cause wear of the valve core, thereby affecting the sealing performance of the electronic expansion valve. At the same time, the body of the stopper is non-circular, and there is a gap between the stopper and the circular hole, and the gap is used to form a part of the gap between the stopper and the through hole.

[0026] In one embodiment, the stopper is roughly rectangular, the diameter of the circular hole is larger than the short side length of the stopper and smaller than the long side length of the stopper, and the circular hole exposes arc-shaped areas on both sides of the stopper to form a part of the gap.

[0027] In this embodiment, the stopper is roughly rectangular, and the length of the long side of the stopper is greater than the diameter of the circular hole, that is, the long side of the stopper extends into at least one groove of the through hole, which can limit the rotation of the stopper. The length of the short side of the stopper is less than the diameter of the circular hole, so that there is a gap between the stopper and the circular hole, and the gap is used to form a part of the gap between the stopper and the through hole.

[0028] In one embodiment, the diameter of the circular hole is greater than the diameter of the transmission rod, and the gap between the circular hole and the transmission rod is used to form a part of the gap.

[0029] In this embodiment, the diameter of the circular hole is larger than the diameter of the transmission rod, and the transmission rod extends into the circular hole and can be displaced along the axial direction of the circular hole. The gap between the circular hole and the transmission rod can be connected to the gap between the stopper and the through hole, thereby connecting the first sub-cavity and the second sub-cavity.

[0030] In one embodiment, the valve body includes a valve port and an outlet, the valve port and the outlet are respectively connected to the first sub-chamber, and the valve core slides in the first sub-chamber and covers the outlet to close the electronic expansion valve.

[0031] In this embodiment, the valve port and the outlet are both connected to the first sub-cavity, that is, when the electronic expansion valve is opened, the valve core in the first sub-cavity does not cover the outlet, and the valve port and the outlet are connected through the first sub-cavity; when the electronic expansion valve is closed, the valve core in the first sub-cavity covers the outlet, so that the valve port and the outlet are not connected.

[0032] In one embodiment, the valve core is provided with a penetrating balancing hole, and the balancing hole is used to connect two sides of the valve core along the axial direction of the valve core.

[0033] In this embodiment, along the axial direction of the valve core, the valve core divides the first sub-cavity into two parts. When the valve core slides in the first sub-cavity, the pressures of the two parts may be different, forming a pressure difference, thereby hindering the sliding of the valve core in the first sub-cavity. The balancing hole can connect the two parts of the first sub-cavity, prevent the pressure difference from forming on both sides of the valve core, reduce the resistance of the valve core sliding in the first sub-cavity, and ensure the reliable operation of the electronic expansion valve.

[0034] In one embodiment, the electronic expansion valve includes a drive assembly and a nut. The nut is located in the second sub-chamber and is threadedly connected to the transmission rod. The drive assembly is used to drive the nut to rotate and drive the transmission rod to move.

[0035] In this embodiment, the driving assembly can drive the nut to rotate, and the nut is threadedly connected to the transmission rod. The rotation of the nut drives the transmission rod to move along the length direction of the transmission rod, and then drives the valve core at one end of the transmission rod to slide, so that the valve core covers or partially covers the outlet, thereby realizing the closing and opening of the electronic expansion valve.

[0036] In one embodiment, a fitting gap is left between the internal thread of the nut and the external thread of the transmission rod, and the side wall of the nut includes a drainage hole, and the drainage hole and the fitting gap are used to connect the second sub-cavity and the through hole.

[0037] In this embodiment, there is a matching gap between the nut and the transmission rod, and the matching gap is connected to the through hole of the guide seat. At the same time, the side wall of the nut includes a drainage hole, one end of the drainage hole is connected to the second sub-cavity, and the other end is connected to the matching gap between the nut and the transmission rod, so that the through hole is connected to the second sub-cavity through the matching gap and the drainage hole.

[0038] In addition, the medium in the enclosed space can be liquid, and the liquid can enter the threaded connection between the nut and the transmission rod to form a lubricating effect, reduce the internal wear of the electronic expansion valve, and thus extend the service life.

[0039] In one embodiment, the electronic expansion valve includes a drive assembly, which is located on a side of the valve core away from the valve port and is drivingly connected to the valve core to drive the valve core to move.

[0040] In this embodiment, the opening and closing of the electronic expansion valve can be actively controlled by controlling the displacement of the valve core in the inner cavity through the drive assembly, wherein the arrangement direction of the drive assembly and the valve core is parallel to the displacement direction of the valve core, which facilitates the transmission connection between the drive assembly and the valve core.

[0041] In one embodiment, the driving assembly includes a stator and a rotor, the stator and the rotor are located outside the valve body, and the rotor is drivingly connected to the valve core via a driving rod.

[0042] In this embodiment, the driving assembly includes a stator and a rotor. The rotor is in driving connection with the valve core. The stator drives the rotor to rotate and drives the valve core to move, so as to realize the on and off of the electronic expansion valve.

[0043] In one embodiment, the rotor is connected to the valve core through a transmission rod, the rotor is threadedly connected to the transmission rod, and the rotation of the rotor drives the transmission rod to move in the inner cavity to drive the valve core to slide.

[0044] In this embodiment, the rotation of the rotor can drive the transmission rod to move along its own length direction, thereby driving the valve core to slide in the first sub-chamber to achieve the opening and closing of the electronic expansion valve.

[0045] In one embodiment, the drive assembly is fixedly connected to the valve body, the transmission rod extends into the second sub-chamber, and the rotor is provided with a drainage hole, one end of the drainage hole is connected to the second sub-chamber, and the other end is connected to the threaded connection between the rotor and the transmission rod.

[0046] In this embodiment, the through hole is connected to the second sub-cavity through the thread matching gap and the drainage hole. The medium in the enclosed space can be liquid. The liquid enters the threaded connection between the rotor and the transmission rod through the through hole to form a lubricating effect, reduce the internal wear of the electronic expansion valve, and thus extend the service life.

[0047] In one embodiment, the electronic expansion valve includes a bearing, which is located on the side of the guide seat away from the valve core along the axial direction of the transmission rod. The bearing is fixed to the second sub-chamber and is used to support the rotation of the nut. A bearing gap is left between the inner ring and the outer ring of the bearing, and the bearing gap is used to connect the through hole and the second sub-chamber.

[0048] In this embodiment, the bearing is arranged in the second sub-cavity along the axial direction of the transmission rod, the outer ring of the bearing is fixedly connected to the inner wall of the second sub-cavity, the inner ring is fixedly connected to the nut, and the inner ring is rotatably connected to the outer ring, so as to realize the rotatable connection between the nut and the valve body. At the same time, there is a bearing gap between the inner ring and the outer ring of the bearing, and the bearing gap can connect the two sides of the bearing, so that the through hole is connected to the second sub-cavity through the bearing gap. In one embodiment, the electronic expansion valve includes a first spring, the first spring is embedded in the valve core, one end of the first spring abuts the valve core, and the other end abuts the transmission rod, and the first spring is used to push the valve core to move.

[0049] In this embodiment, a first spring is embedded in the valve core to form an elastic connection between the valve core and the transmission rod. During the sliding of the transmission rod, the first spring is in a compressed state and pushes the valve core to slide, so as to ensure the sealing of the valve core and the first sub-chamber when the electronic expansion valve is closed.

[0050] In one embodiment, the electronic expansion valve includes a second spring, which is sleeved outside the valve core, with one end of the second spring abutting against the valve core and the other end abutting against the inner wall of the first sub-chamber, and the second spring is used to keep the valve core sliding smoothly.

[0051] In this embodiment, a second spring is disposed outside the valve core so that the valve core and the first sub-chamber are elastically connected. During the sliding of the valve core, the second spring is in a compressed state and ensures the stability of the sliding of the valve core.

[0052] In one embodiment, the electronic expansion valve includes a sealing ring, which surrounds the side wall of the valve core and is located on a side of the outlet away from the valve port, for preventing leakage of the electronic expansion valve.

[0053] In this embodiment, a sealing ring is provided on the side wall of the valve core, and the sealing ring is located on the side of the outlet away from the valve port. When the electronic expansion valve is closed, the sealing ring can ensure that the outlet is separated from the first sub-cavity, preventing the outlet from connecting to the first sub-cavity through the gap between the valve core and the inner cavity, thereby avoiding leakage of the electronic expansion valve.

[0054] In a second aspect, an embodiment of the present application further provides a thermal management system, which includes the above-mentioned electronic expansion valve.

[0055] In a third aspect, an embodiment of the present application also provides a vehicle, which includes the above-mentioned electronic expansion valve or thermal management system, and the electronic expansion valve or thermal management system is arranged in the vehicle to control the temperature of the vehicle.

[0056] The thermal management system and vehicle of the present application can reduce the pressure difference inside the electronic expansion valve by adopting the above-mentioned electronic expansion valve, thereby ensuring the reliable operation of the electronic expansion valve, thereby improving the reliability of the thermal management system and the vehicle and having a longer life. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a schematic diagram of the structure of an electronic expansion valve provided in one embodiment of the present application;

[0058] Figure 2 This is a schematic diagram of the internal cross-section of an electronic expansion valve provided in one embodiment of the present application;

[0059] Figure 3 A partial cross-sectional schematic diagram of an electronic expansion valve provided in one embodiment of the present application;

[0060] Figure 4 This is a schematic diagram of the structure of a guide seat provided in one embodiment of the present application;

[0061] Figure 5 A cross-sectional schematic diagram of a guide seat provided in an embodiment of the present application;

[0062] Figure 6 This is a schematic diagram of the structure of the valve core, transmission rod and anti-rotation member of the electronic expansion valve provided in one embodiment of the present application;

[0063] Figure 7 A partial cross-sectional schematic diagram of a valve core, a transmission rod and a rotation-stopping member of an electronic expansion valve provided in one embodiment of the present application;

[0064] Figure 8 This is a schematic diagram of a valve core structure provided in one embodiment of the present application;

[0065] Fig. 9 A schematic cross-sectional view of a valve core provided in one embodiment of the present application;

[0066] Fig.10 This is a schematic diagram of the structure of the nut and bearing part of the electronic expansion valve provided in one embodiment of the present application;

[0067] Fig.11 A schematic cross-sectional view of a nut and a bearing portion of an electronic expansion valve provided in an embodiment of the present application;

[0068] Fig.12 A partial cross-sectional schematic diagram of an electronic expansion valve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0070] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0071] The present application relates to a vehicle, in which a thermal management system or an electronic expansion valve is provided, and the thermal management system includes a closed container electronic expansion valve. A heat exchange medium flows in the closed container, and the electronic expansion valve of the present application can be connected between the closed containers and control the flow of the heat exchange medium between the closed containers, thereby adjusting the internal pressure and temperature regulation capability of the thermal management system.

[0072] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 The structure diagram of the electronic expansion valve 100 provided in one embodiment of the present application is shown. Figure 2 The figure shows an internal cross-sectional view of an electronic expansion valve 100 provided in one embodiment of the present application. Figure 3 A schematic cross-sectional view of a valve body portion of an electronic expansion valve 100 provided in one embodiment of the present application is shown.

[0073] The electronic expansion valve 100 provided in the present application includes a valve body 10, a valve core assembly 20, a guide seat 50 and a stopper 80. The valve body 10 is in an axisymmetric columnar shape, the interior of the valve body 10 includes an inner cavity 11 and a valve port 12 connected to the inner cavity 11, the guide seat 50 is disposed in the inner cavity 11, and divides the inner cavity 11 into a first sub-cavity 111 and a second sub-cavity 112, and the guide seat 50 is provided with a through hole 51, and the through hole 51 connects the first sub-cavity 111 and the second sub-cavity 112.

[0074] Specifically, in one embodiment, a valve port 12 is provided at one end of the first sub-cavity 111 along the length direction, and an outlet 13 is provided on the outer wall of the first sub-cavity 111. The valve port 12 and the outlet 13 are respectively connected to the first sub-cavity 111, and the valve port 12 and the outlet 13 are also respectively connected to a sealed container, and a heat exchange medium is contained in the sealed container. The heat exchange medium can flow between the sealed containers through the electronic expansion valve 100 to maintain the normal operation of the thermal management system.

[0075] A valve core assembly 20 is disposed in the inner cavity 11 . The valve core assembly 20 is located in the inner cavity 11 and is movably connected to the inner cavity 11 . The valve core assembly 20 slides in the inner cavity 11 to open or close the electronic expansion valve 100 .

[0076] Specifically, in one embodiment, the valve core assembly 20 includes a valve core 21 and a transmission rod 22. The valve core 21 is located in the first sub-chamber 111 and is movably connected to the first sub-chamber 111. One end of the transmission rod 22 is fixedly connected to the valve core 21, and the other end passes through the through hole 51 and extends into the second sub-chamber 112. The transmission rod 22 drives the valve core 21 to slide to open or close the electronic expansion valve 100.

[0077] The valve core assembly 20 is provided with a stopper 80, which is located in the through hole 51. The stopper 80 follows the sliding of the valve core assembly 20 and slides in the through hole 51. The stopper 80 cooperates with the through hole 51 to limit the rotation of at least the portion of the valve core assembly 20 that cooperates with the valve port 12 relative to the valve body 10. A first gap is left between the stopper 80 and the through hole 51, and the first gap can communicate the first sub-cavity 111 and the second sub-cavity 112.

[0078] Specifically, in one embodiment, the through hole 51 of the guide seat 50 includes a first inner wall 511 and a second inner wall 512, the stopper 80 is rectangular, and the stopper 80 cooperates with the first inner wall 511, so that the stopper 80 cannot rotate relative to the guide seat 50. At the same time, there is a first gap between the stopper 80 and the first inner wall 511, and the first gap connects the first sub-cavity 111 and the second sub-cavity 112.

[0079] The electronic expansion valve 100 of the present application is connected between sealed containers, and the sealed containers are connected through the first sub-cavity 111. The valve core 21 slides in the first sub-cavity 111 to open or close the electronic expansion valve 100, thereby connecting or disconnecting the sealed containers.

[0080] The thermal management system provided with the electronic expansion valve 100 of the present application can be used to adjust the ambient temperature. When the thermal management system performs temperature adjustment, one of the sealed containers is located in the environment to be regulated, and the other sealed container is located outside. The heat exchange medium flows to the sealed container through the electronic expansion valve 100, and the heat exchange medium absorbs heat from the environment or releases heat in the heat exchange medium in the sealed container to achieve temperature adjustment of the environment.

[0081] The interior of the electronic expansion valve 100 is divided into two sub-cavities by the guide seat 50. During the operation of the electronic expansion valve 100, the pressures between the two sub-cavities may be different, forming a pressure difference. An excessively large pressure difference may damage the guide seat 50. At the same time, the volume of the sub-cavity is small. When the pressure of the sub-cavity is too high, the valve body 10 may be damaged, thereby reducing the sealing performance of the electronic expansion valve 100.

[0082] There is a first gap between the stopper 80 and the through hole 51 of the electronic expansion valve 100 of the present application, and the first gap connects the first sub-cavity 111 and the second sub-cavity 112, thereby eliminating the pressure difference that may be formed between the two sub-cavities, and ensuring the reliable operation of the electronic expansion valve 100. In addition, the valve core assembly 20 in the electronic expansion valve 100 of the present application slides in the inner cavity 11, thereby opening or closing the electronic expansion valve 100. The valve core assembly 20 is provided with a stopper 80, and the stopper 80 cooperates with the through hole 51 of the guide seat 50 to limit the rotation of the transmission rod 22 and the valve core 21 relative to the valve body 10, which can reduce the wear caused by the relative rotation of the valve core 21 and the valve body 10, and avoid the reduction of the sealing performance of the electronic expansion valve 100.

[0083] It should be pointed out that the electronic expansion valve 100 of the present application can be applied to the above-mentioned thermal management system as a component for connecting sealed containers and adjusting the pressure between sealed containers. However, the electronic expansion valve 100 is not limited to be applied to thermal management systems. In other sealed systems that need to control flow and pressure, the electronic expansion valve 100 of the present application can also be used and has higher reliability and service life.

[0084] In one embodiment, if Figure 3 As shown, the valve core assembly 20 includes a valve core 21 and a transmission rod 22. The valve core 21 is located in the first sub-chamber 111. One end of the transmission rod 22 is used to fix the valve core 21, and the other end passes through the through hole 51. The transmission rod 22 is used to drive the valve core 21 to slide to open or close the electronic expansion valve 100. Figure 4-Figure 7 ,in Figure 4 The structure diagram of the guide seat 50 provided in one embodiment of the present application is shown. Figure 5 A cross-sectional diagram of a guide seat 50 provided in an embodiment of the present application is shown. Figure 6 The schematic diagram of the structure of the valve core 21, the transmission rod 22 and the anti-rotation member 80 of the electronic expansion valve 100 provided in one embodiment of the present application is shown. Figure 7 A partial cross-sectional schematic diagram of a valve core 21, a transmission rod 22 and a rotation-stopping member 80 of an electronic expansion valve 100 provided in an embodiment of the present application is illustrated.

[0085] In one embodiment, if Figure 4-Figure 7As shown, one of the inner wall of the through hole 51 and the outer peripheral surface of the stop member 80 includes at least one arc surface, and the other includes at least one plane, and a first gap is formed between the arc surface and the plane, so that the heat exchange medium can pass through the gap between the inner wall of the through hole 51 and the outer peripheral surface of the stop member 80, thereby connecting the first sub-cavity 111 and the second sub-cavity 112.

[0086] In one embodiment, if Figure 4-Figure 7 As shown, the through hole 51 includes a first inner wall 511 and a second inner wall 512, and the stop member 80 includes a main body and a stop portion. The stop member 80 is located in the through hole 51, and the stop portion cooperates with the first inner wall 511 to limit the rotation of the valve core 21. The stop member 80 cannot rotate relative to the guide seat 50, so that the transmission rod 22 and the valve core 21 cannot rotate relative to the guide seat 50, thereby limiting the rotation of the valve core 21 relative to the valve body 10, preventing the valve core 21 from rotating and rubbing against the valve body 10 to cause wear of the valve core 21, thereby affecting the sealing performance of the electronic expansion valve 100.

[0087] In this embodiment, the body includes a plane, the second inner wall 512 includes an arc surface, and there is a gap between the plane and the arc surface, and the gap is used to form at least a part of the first gap.

[0088] In another embodiment, the second inner wall 512 includes a plane, the body includes an arc surface, and there is also a gap between the body and the second inner wall 512, thereby forming at least a portion of the first gap.

[0089] In one embodiment, if Figure 4-Figure 7 As shown, the through hole 51 includes a circular hole and at least one groove, and the stopper 80 includes a body and a stopper, the body is non-circular, the body is located in the circular hole, and the stopper is embedded in at least one groove to limit the rotation of the valve core 21. The stopper of the stopper 80 is embedded in the groove of the through hole 51, and the stopper 80 cannot rotate relative to the guide seat 50, so that the valve core assembly 20 cannot rotate relative to the guide seat 50, thereby limiting the rotation of the valve core 21 relative to the valve body 10, preventing the valve core 21 from rotating and rubbing against the valve body 10 to cause wear of the valve core 21, thereby affecting the sealing performance of the electronic expansion valve 100.

[0090] It can be understood that the body of the stop member 80 is non-circular, and there is a gap between the stop member 80 and the circular hole, and the gap is used to form a part of the gap between the stop member 80 and the through hole 51, that is, the first sub-cavity 111 can be connected to the second sub-cavity 112 through the gap between the stop member 80 and the through hole 51, so that the sub-cavity pressures on both sides of the guide seat 50 are balanced.

[0091] In one embodiment, if Figure 6 and Figure 7As shown, the stopper 80 is roughly rectangular, and the circular hole has arc-shaped areas on both sides of the stopper 80, which are used to form a part of the gap between the stopper 80 and the through hole 51. One end of the stopper 80 extends into the groove, so that the stopper 80 cannot rotate relative to the guide seat 50, thereby limiting the rotation of the valve core 21 relative to the valve body 10, thereby reducing the wear of the valve core 21.

[0092] It can be understood that the short side length of the stop member 80 is smaller than the diameter of the circular hole, and the stop member 80 cannot completely cover the circular hole. The long side of the stop member 80 and the circular hole together form an arc area, which is located on both sides of the stop member 80 and is used to form a part of the gap between the stop member 80 and the circular hole, thereby connecting the first sub-cavity 111 and the second sub-cavity 112.

[0093] In one embodiment, the cross-sections of the stopper 80 and the through hole 51 along the axis of the through hole 51 are both non-circular, and the cross-sectional size of the stopper 80 is smaller than the cross-sectional size of the through hole 51. The through hole 51 can limit the rotation of the stopper 80 and can also limit the rotation of the valve core 21 relative to the valve body 10. At the same time, there is a first gap between the stopper 80 and the through hole 51, and the first gap can also connect the first sub-cavity 111 and the second sub-cavity 112.

[0094] In one embodiment, a second gap is formed between the through hole 51 and the transmission rod 22, and the second gap is used to connect the first sub-cavity 111 and the second sub-cavity 112. The second gap is connected to the first gap to achieve internal pressure balance of the electronic expansion valve 100.

[0095] In one embodiment, if Figure 5 As shown, the guide seat 50 is provided with an extension portion 52, which is located in the through hole 51 and extends toward the center of the through hole 51, and a second gap is formed between the extension portion 52 and the transmission rod 22. The extension portion 52 can limit the movement of the anti-rotation member 80 toward the second sub-cavity 112 along the axial direction, so as to prevent the anti-rotation member 80 from sliding out of the through hole 51, resulting in the failure of the anti-rotation effect of the anti-rotation member 80. At the same time, the extension portion 52 can also limit the sliding range of the valve core 21 in the first sub-cavity 111.

[0096] In other embodiments, the position of the extension portion 52 in the through hole 51 may be set based on a desired sliding range of the valve core 21 .

[0097] In one embodiment, the extension length of the extension portion 52 is greater than the maximum radial distance of the first gap along the guide seat 50 , so as to reliably limit the axial movement range of the extension portion 52 on the valve core 21 .

[0098] In one embodiment, the diameter of the through hole 51 is larger than the diameter of the transmission rod 22, and a second gap is left between the through hole 51 and the transmission rod 22. The second gap can also connect the first sub-cavity 111 and the second sub-cavity 112. The first sub-cavity 111 can be connected to the second sub-cavity 112 through the gap between the through hole 51 and the transmission rod 22.

[0099] In one embodiment, if Figure 3 As shown, the valve body 10 includes a valve port 12 and an outlet 13, and the valve port 12 and the outlet 13 are respectively connected to the first sub-cavity 111, and the valve port 12 can be connected to the outlet 13 through the first sub-cavity 111. The valve core 21 slides in the first sub-cavity 111, and the valve core 21 can cover the outlet 13, separating the valve port 12 and the outlet 13, so that the electronic expansion valve 100 is closed.

[0100] In one embodiment, if Figure 3 As shown, the valve port 12 is located at the end of the valve body 10 and is connected to the first sub-cavity 111, the outlet 13 is located on the side wall of the valve body 10 and is connected to the first sub-cavity 111, the thickness of the valve core 21 is greater than the diameter of the outlet 13, and the valve core 21 can completely cover the outlet 13, separating the valve port 12 from the outlet 13, so that the electronic expansion valve 100 is closed.

[0101] In other embodiments, the valve core 21 can completely cover the valve port 12 , or can separate the valve port 12 from the outlet 13 , so that the electronic expansion valve 100 is closed.

[0102] In other embodiments, the positions of the valve port 12 and the outlet 13 can be set based on the sliding range of the valve core 21 , so that the position of the valve core 21 can be controlled to open or close the electronic expansion valve 100 .

[0103] In one embodiment, if Figure 3 As shown, the electronic expansion valve 100 is provided with a plurality of outlets 13, and the outlets 13 surround the outer wall of the valve body 10. The plurality of outlets 13 can increase the outlet flow of the electronic expansion valve 100, thereby improving the temperature regulation rate of the thermal management system. At the same time, during the sliding process of the valve core 21, the valve core 21 can completely cover the plurality of outlets 13 to achieve the closing of the electronic expansion valve 100. In other embodiments, the number of outlets 13 of the electronic expansion valve 100 can be arbitrarily set based on the required outlet flow.

[0104] See also Figure 8 and Fig. 9 ,in Figure 8 The structure diagram of the valve core 21 provided in one embodiment of the present application is shown. Fig. 9 A cross-sectional schematic diagram of a valve core 21 provided in an embodiment of the present application is illustrated.

[0105] In one embodiment, if Figure 3 , Figure 8 and Fig. 9 As shown, along the axial direction of the valve core 21, the valve core 21 is used to separate the first sub-chamber 111 into two parts, and the valve core 21 is provided with a penetrating balance hole 211, and the balance hole 211 is used to connect the two axial sides of the valve core 21, that is, the balance hole 211 is used to connect the two parts of the first sub-chamber 111. The valve core 21 divides the first sub-chamber 111 into two parts. When the valve core 21 slides in the first sub-chamber 111, the pressures of the two parts may be different, forming a pressure difference. The pressure difference hinders the sliding of the valve core 21 in the first sub-chamber 111. The balance hole 211 can connect the two parts of the first sub-chamber 111, prevent the pressure difference from being formed between the two parts, reduce the resistance of the valve core 21 sliding in the first sub-chamber 111, and ensure the reliable operation of the electronic expansion valve 100.

[0106] In one embodiment, Figure 3 As shown, the valve core 21 is provided with a balancing hole 211 connecting the two parts. Figure 8 and Fig. 9 As shown, the valve core 21 is provided with a plurality of balancing holes 211, and the plurality of balancing holes 211 can increase the speed at which the heat exchange medium flows from the valve port 12 into the first sub-chamber 111 away from the valve port 12, and can quickly reduce the pressure difference on both sides of the valve core 21. In other embodiments, the number and position of the balancing holes 211 on the valve core 21 can be arbitrarily set based on the required rate of change of the pressure difference on both sides of the valve core 21.

[0107] In one embodiment, if Figure 3 As shown, the electronic expansion valve 100 includes a drive assembly 30 and a nut 60, the nut 60 is located in the second sub-chamber 112, the nut 60 is threadedly connected to the transmission rod 22, and the drive assembly 30 is used to drive the nut 60 to rotate and drive the transmission rod 22 to move. The drive assembly 30 is connected to the valve core 21 through the transmission rod 22 and provides power to the valve core 21, so that the valve core 21 can move in the first sub-chamber 111. The drive assembly 30 can control the displacement of the valve core 21 in the first sub-chamber 111 to realize the opening and closing of the electronic expansion valve 100.

[0108] In one embodiment, if Figure 1 and Figure 2 As shown, the electronic expansion valve 100 includes a drive assembly 30, which is located on a side of the valve core 21 away from the valve port 12 and is in driving connection with the valve core 21 to drive the displacement of the valve core 21. The drive assembly 30 provides power to the valve core 21 so that the valve core 21 can slide in the first sub-chamber 111. The drive assembly 30 can control the sliding of the valve core 21 in the inner chamber 11 to realize the opening and closing of the electronic expansion valve 100.

[0109] In one embodiment, if Figure 2As shown, the arrangement direction of the driving assembly 30 and the valve core 21 is parallel to the displacement direction of the valve core 21 , which facilitates the transmission connection between the driving assembly 30 and the valve core 21 .

[0110] See also Fig.10 and Fig.11 ,in Fig.10 The schematic diagram of the structure of the nut 60 and the bearing 70 of the electronic expansion valve 100 provided in one embodiment of the present application is shown. Fig.11 A partial cross-sectional schematic diagram of a nut 60 and a bearing 70 of an electronic expansion valve 100 provided in an embodiment of the present application is illustrated.

[0111] In one embodiment, if Fig.11 As shown, the nut 60 is provided with a threaded hole 61, and the end of the transmission rod 22 away from the valve core 21 is provided with an external thread and extends into the threaded hole 61. The external thread of the transmission rod 22 cooperates with the internal thread of the threaded hole 61 to form a threaded connection between the nut 60 and the transmission rod 22.

[0112] In another embodiment, the threaded hole 61 can be arranged at the end of the transmission rod 22 away from the valve core 21, and the nut 60 is provided with an external thread at the end facing the valve core 21, and extends into the threaded hole 61 of the transmission rod 22. The external thread of the nut 60 cooperates with the internal thread of the transmission rod 22 to form a threaded connection between the nut 60 and the transmission rod 22.

[0113] In the above specific embodiment, an internal thread or an external thread is provided between the nut 60 and the transmission rod 22 to form a threaded connection, so that the rotation of the nut 60 drives the transmission rod 22 to slide along the extension direction of the thread and transmits it to the valve core 21, thereby driving the valve core 21 to move in the inner cavity 11.

[0114] In some embodiments, Figure 2 As shown, the driving assembly 30 includes a stator 31 and a rotor 32, wherein the stator 31 is located outside the valve body 10, and the rotor 32 is located in the second sub-cavity 112, and the rotor 32 is fixedly connected to the nut 60. When the stator 31 is energized, a magnetic field is generated, and the magnetic field passes through the rotor 32 and drives the rotor 32 to rotate, and the rotor 32 drives the nut 60 to rotate and transmits the rotation to the valve core 21 through the transmission rod 22, thereby driving the valve core 21 to slide.

[0115] In other embodiments, the threaded hole 61 can also be set on the rotor 32, and the end of the transmission rod 22 away from the valve core 21 is provided with an external thread and extends into the threaded hole 61. The external thread of the transmission rod 22 cooperates with the internal thread of the threaded hole 61 to form a threaded connection between the rotor 32 and the transmission rod 22.

[0116] In other embodiments, the threaded hole 61 can be arranged at the end of the transmission rod 22 away from the valve core 21, and the end of the rotor 32 facing the valve core 21 is provided with an external thread, and extends into the threaded hole 61 of the transmission rod 22. The external thread of the rotor 32 cooperates with the internal thread of the transmission rod 22 to form a threaded connection between the rotor 32 and the transmission rod 22.

[0117] In the above specific embodiment, an internal thread or an external thread is provided between the rotor 32 and the transmission rod 22 to form a threaded connection, so that the rotation of the rotor 32 drives the transmission rod 22 to move along the extension direction of the thread and transmits it to the valve core 21, thereby driving the valve core 21 to slide in the inner cavity 11, so that the valve core 21 can cover the outlet 13, thereby closing the electronic expansion valve 100. In one embodiment, as Fig.11 As shown, the nut 60 is provided with a threaded hole 61, the transmission rod 22 extends into the threaded hole 61 and is threadedly matched with the nut 60, a matching gap is left between the internal thread of the nut 60 and the external thread of the transmission rod 22, and the side wall of the nut 60 includes a drainage hole 62, one end of the drainage hole 62 is connected to the second sub-cavity 112, and the other end is connected to the threaded hole 61. The matching gap between the nut 60 and the transmission rod 22 is connected to the through hole 51, so that the first sub-cavity 111 is connected to the second sub-cavity 112 through the through hole 51, the matching gap and the drainage hole 62.

[0118] In another embodiment, a matching gap is left between the external thread of the nut 60 and the internal thread of the transmission rod 22, and the transmission rod 22 is provided with a drainage hole 62, one end of the drainage hole 62 is connected to the matching gap, and the other end is connected to the through hole 51. The matching gap between the nut 60 and the transmission rod 22 is connected to the second sub-cavity 112, so that the first sub-cavity 111 is connected to the second sub-cavity 112 through the through hole 51, the drainage hole 62 and the matching gap.

[0119] In one embodiment, a matching gap is left between the internal thread of the rotor 32 and the external thread of the transmission rod 22, and the side wall of the rotor 32 includes a drainage hole 62, one end of the drainage hole 62 is connected to the second sub-cavity 112, and the other end is connected to the threaded hole 61. The matching gap between the rotor 32 and the transmission rod 22 is connected to the through hole 51, so that the first sub-cavity 111 is connected to the second sub-cavity 112 through the through hole 51, the matching gap and the drainage hole 62.

[0120] In another embodiment, a matching gap is left between the external thread of the rotor 32 and the internal thread of the transmission rod 22, and the transmission rod 22 is provided with a drainage hole 62, one end of the drainage hole 62 is connected to the matching gap, and the other end is connected to the through hole 51. The matching gap between the rotor 32 and the transmission rod 22 is connected to the second sub-cavity 112, so that the first sub-cavity 111 is connected to the second sub-cavity 112 through the through hole 51, the drainage hole 62 and the matching gap.

[0121] In the above specific embodiment, the heat exchange medium in the enclosed space can be liquid. The valve port 12 is connected to the gap of the threaded fitting through the balance hole 211 and the through hole 51, so that the heat exchange medium can flow into the threaded connection, provide lubrication for the threaded connection, reduce the wear caused by the contact between the internal thread and the external thread, and extend the service life of the electronic expansion valve 100.

[0122] In other embodiments, the number of the drainage holes 62 can be arbitrarily set based on the required lubrication effect of the threaded connection.

[0123] In one embodiment, if Fig.11 As shown, the electronic expansion valve 100 includes a bearing 70, which is arranged along the axial direction of the transmission rod 22 and is located on the side of the guide seat 50 away from the valve core 21. The bearing 70 includes an outer ring 71 and an inner ring 72. The outer ring 71 is fixed in the second sub-chamber 112, and the inner ring 72 is fixedly connected to the nut 60. The outer ring 71 is rotatably connected to the inner ring 72 to realize the rotatable connection between the nut 60 and the valve body 10.

[0124] It can be understood that a bearing gap is left between the outer ring 71 and the inner ring 72 , and the bearing gap connects the two ends of the bearing 70 , and then the first sub-cavity 111 is connected to the second sub-cavity 112 via the through hole 51 and the bearing gap.

[0125] See also Fig.12 A partial cross-sectional schematic diagram of an electronic expansion valve 100 provided in an embodiment of the present application is shown.

[0126] In one embodiment, if Fig.12 As shown, the electronic expansion valve 100 includes a first spring 91 , which is embedded in the valve core 21 , one end of the first spring 91 abuts against the valve core 21 , and the other end abuts against the transmission rod 22 . The first spring 91 is used to push the valve core 21 to move toward the valve port 12 .

[0127] A first spring 91 is provided between the transmission rod 22 and the valve core 21, so that the valve core 21 is elastically connected to the transmission rod 22. When the transmission rod 22 slides toward the valve port 12, the first spring 91 compresses and pushes the valve core 21 to slide toward the valve port 12, so that the valve core 21 can completely cover the outlet 13, so as to ensure the sealing performance of the valve core 21 and the inner cavity 11 when the electronic expansion valve 100 is closed.

[0128] In one embodiment, if Fig.12As shown, the electronic expansion valve 100 includes a second spring 92, which is sleeved outside the valve core 21, one end of the second spring 92 abuts against the valve core 21, and the other end abuts against the inner wall of the first sub-chamber 111, and the second spring 92 is used to keep the valve core 21 sliding smoothly. The second spring 92 is arranged between the transmission rod 22 and the first sub-chamber 111, so that the valve core 21 and the first sub-chamber 111 are elastically connected. In the process of the valve core 21 sliding toward the valve port 12, the second spring 92 is in a compressed state, so that the valve core 21 can slide smoothly.

[0129] In one embodiment, if Fig.12 As shown, the electronic expansion valve 100 includes a sealing ring 212, which surrounds the side wall of the valve core 21, and is located on the side of the outlet 13 away from the valve port 12, and the sealing ring 212 is used to prevent leakage of the electronic expansion valve 100. When the electronic expansion valve 100 is in a closed state, the sealing ring 212 can ensure that the outlet 13 is separated from the inner cavity 11 on the side away from the valve port 12, and prevent the valve port 12 from communicating with the inner cavity 11 on the side away from the valve port 12 through the balancing hole 211, thereby avoiding leakage of the electronic expansion valve 100.

[0130] In one embodiment, the sealing ring 212 may also be disposed around the side wall of the valve body 10, and the sealing ring 212 is located on the side of the outlet 13 away from the valve port 12. When the outlet 13 is connected to other pipelines, the sealing ring 212 is located in the gap between the other pipelines and the valve body 10, which can improve the sealing effect of the outlet 13 of the electronic expansion valve 100.

[0131] In other embodiments, there may be multiple sealing rings 212, which are respectively located on the side of the outlet 13 away from the valve port 12 and the side of the outlet 13 away from the valve port 12. When the outlet 13 is connected to other pipelines, the sealing ring 212 is located in the gap between the other pipelines and the valve body 10, which can improve the sealing effect of the outlet 13 of the electronic expansion valve 100.

[0132] In one embodiment, the sealing ring 212 can also be arranged around the side wall of the valve body 10, and is located on the side of the valve body 10 facing the valve port 12. When the valve port 12 is connected to other pipelines, the sealing ring 212 is located in the gap between the other pipelines and the valve body 10, which can improve the sealing effect of the valve port 12 of the electronic expansion valve 100.

[0133] In a preferred embodiment, the cross-sectional area of ​​the first gap is S1, the cross-sectional area of ​​the portion where the through hole 51 cooperates with the stop member 80 is S2, and the range of S1:S2 is 1:6-1:1, for example, S1:S2=1:6. At this time, the first gap has sufficient space for the heat exchange medium to flow, so that the pressure difference between the first sub-chamber 111 and the second sub-chamber 112 can be quickly balanced.

[0134] In a preferred embodiment, the maximum radial distance of the second gap along the guide seat 50 is d1, the diameter of the portion of the transmission rod 22 corresponding to the extension portion 52 is d2, d1 ≥ 1 / 3d2, and the second gap also has sufficient space for the heat exchange medium to flow, and can also enable the pressure difference between the first sub-chamber 111 and the second sub-chamber 112 to be quickly balanced.

[0135] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body having an inner cavity with a valve port; A valve core assembly is reciprocatably disposed in the inner cavity to open or close the valve port; A guide seat, fixed in the inner cavity, and dividing the inner cavity into a first sub-cavity and a second sub-cavity, wherein the guide seat comprises a through hole for connecting the first sub-cavity and the second sub-cavity; A stopper is fixed to the valve core assembly and is located in the through hole. The stopper is used to cooperate with the through hole to limit the rotation of at least the part of the valve core assembly that cooperates with the valve port. A first gap is left between the stopper and the through hole, and the first gap is used to connect the first sub-cavity and the second sub-cavity.

2. The electronic expansion valve according to claim 1, characterized in that: The cross-sectional area of ​​the first gap is S1, the cross-sectional area of ​​the portion where the through hole cooperates with the rotation-stopping member is S2, and the range of S1:S2 is 1:6-1:

1.

3. The electronic expansion valve according to claim 1, characterized in that: One of the inner wall of the through hole and the outer peripheral surface of the rotation-stopping member includes at least one arc surface, and the other includes at least one plane, and at least a portion of the first gap is formed between the arc surface and the plane.

4. The electronic expansion valve according to claim 3, characterized in that: The anti-rotation member includes a main body and a anti-rotation portion, the through hole includes at least a first inner wall and a second inner wall, the first inner wall cooperates with the anti-rotation portion to limit the rotation of at least a part of the valve core assembly that cooperates with the valve port, the second inner wall includes the arc surface, the main body includes the plane, and at least a part of the first gap is formed between the arc surface and the plane.

5. The electronic expansion valve according to claim 1, characterized in that: The valve core assembly includes a valve core and a transmission rod, the valve core is located in the first sub-chamber, one end of the transmission rod is used to fix the valve core, and the other end passes through the through hole, and the transmission rod is used to drive the valve core to slide to open or close the electronic expansion valve.

6. The electronic expansion valve according to claim 5, characterized in that: A second gap is formed between the through hole and the transmission rod, and the second gap is used to connect the first sub-cavity and the second sub-cavity.

7. The electronic expansion valve according to claim 6, characterized in that: The guide seat is provided with an extension portion, the extension portion is located in the through hole and extends toward the center of the through hole, and the second gap is formed between the extension portion and the transmission rod.

8. The electronic expansion valve according to claim 7, characterized in that: The maximum distance of the second gap along the radial direction of the guide seat is d1, the diameter of the portion of the transmission rod corresponding to the extension portion is d2, and d1≥1 / 3d2.

9. The electronic expansion valve according to claim 7, characterized in that: An extension length of the extension portion is greater than a maximum distance of the first gap along a radial direction of the guide seat.

10. The electronic expansion valve according to claim 4, characterized in that: The valve core is provided with a penetrating balancing hole, and the balancing hole is used to connect the two sides of the valve core along the axial direction of the valve core.

11. The electronic expansion valve according to claim 5, characterized in that: The electronic expansion valve comprises a driving assembly and a nut. The nut is located in the second sub-chamber and is threadedly connected to the transmission rod. The driving assembly is used to drive the nut to rotate and drive the transmission rod to move.

12. The electronic expansion valve according to claim 11, characterized in that: The side wall of the nut comprises a drainage hole, and the drainage hole is used to connect the second sub-cavity and the through hole.

13. The electronic expansion valve according to claim 11, characterized in that: The electronic expansion valve includes a bearing, which is located on the side of the guide seat away from the valve core along the axial direction of the transmission rod. The bearing is fixed to the second sub-cavity and is used to support the rotation of the nut. A bearing gap is left between the inner ring and the outer ring of the bearing, and the bearing gap is used to connect the through hole and the second sub-cavity.

14. A thermal management system, characterized in that: The thermal management system comprises the electronic expansion valve according to any one of claims 1-13.

15. A vehicle, characterized in that: The invention comprises the electronic expansion valve according to any one of claims 1 to 13 or the thermal management system according to claim 14.

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