Electronic expansion valve, thermal management system and vehicle

Abstract

The utility model relates to an electronic expansion valve, a heat management system and a vehicle, the electronic expansion valve comprises a valve body, a valve needle assembly and a guide seat, the valve body comprises an inner cavity, the valve needle assembly and the guide seat are located in the inner cavity, and the guide seat is suitable for being matched with the valve needle assembly to limit rotation of the valve needle assembly; the guide seat is in rotation stopping fit with the inner wall of the valve body so as to limit relative rotation between the guide seat and the valve body. According to the electronic expansion valve, the guide seat and the inner wall of the valve body are in rotation stopping fit to limit relative rotation between the guide seat and the valve body, the guide seat is prevented from rotating along with the valve needle assembly, rotation of the valve needle assembly is limited, normal work of the electronic expansion valve is guaranteed, and the electronic expansion valve has higher reliability.

Description

Technical Field

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

[0002] When the rotor of the electronic expansion valve in the related art drives the valve needle to open or close the valve port, the valve needle moves and rotates, and the wear between the valve needle and the valve port is relatively large. Utility Model Content

[0003] In view of the above-mentioned technical problems, the purpose of this application is to provide an electronic expansion valve, which can limit the relative rotation between the guide seat and the valve body, and the guide seat is suitable for cooperating with the valve needle assembly to limit the rotation of the valve needle assembly, thereby reducing the wear between the valve needle assembly and the valve port. This application also proposes a thermal management system including the electronic expansion valve and a vehicle including the electronic expansion valve or the thermal management system. Specifically, it includes the following technical solutions:

[0004] In a first aspect, an embodiment of the present application provides an electronic expansion valve, comprising a valve body, a valve needle assembly and a guide seat, the valve body comprising an inner cavity, the valve needle assembly and the guide seat being located in the inner cavity, the guide seat being suitable for cooperating with the valve needle assembly to limit the rotation of the valve needle assembly, and the guide seat and the inner wall of the valve body being cooperating to limit the relative rotation between the guide seat and the valve body.

[0005] The valve needle assembly of the electronic expansion valve of the present application is located in the inner cavity and is used to open or close the electronic expansion valve. The guide seat cooperates with the inner wall of the valve body to limit the relative rotation between the guide seat and the valve body. The guide seat cooperates with the valve needle assembly to limit the rotation of the valve needle assembly, which effectively avoids the rotation between the valve needle assembly and the valve body, ensures the normal operation of the electronic expansion valve, and makes it have higher reliability.

[0006] In one embodiment, one of the guide seat and the inner wall of the valve body is provided with a protrusion, and the other is provided with a groove, and the protrusion extends into the groove to limit the relative rotation between the guide seat and the valve body.

[0007] In one embodiment, a plurality of protrusions are provided and a plurality of grooves are provided.

[0008] In one embodiment, the protrusion is substantially an arc-shaped protrusion, and the contour of the groove matches the contour of the protrusion.

[0009] In one embodiment, the guide seat includes a body and a through hole passing through the body, and the valve needle assembly is provided with a stopper, which is at least partially located in the through hole. The through hole and the stopper cooperate to limit the relative rotation between the valve needle assembly and the guide seat.

[0010] In one embodiment, the guide seat divides the inner cavity into a first sub-cavity and a second sub-cavity, and the through hole is used to connect the first sub-cavity and the second sub-cavity.

[0011] In one embodiment, the protrusion is provided with a flow channel groove, the flow channel groove is used to connect the groove and the through hole, the groove is used to communicate with the second sub-cavity, and the second sub-cavity is located on the side of the guide seat away from the valve port.

[0012] In one embodiment, the flow channel groove extends in a direction perpendicular to the axial direction of the valve needle assembly.

[0013] In one embodiment, the electronic expansion valve includes a drive assembly and a nut. The nut is located in the inner cavity and is threadedly connected to the valve needle assembly. The drive assembly is used to drive the nut to rotate and drive the valve needle assembly to reciprocate.

[0014] In one embodiment, the electronic expansion valve includes a bearing, which is fixed in the inner cavity and used to support the nut to rotate.

[0015] In one embodiment, the valve needle assembly includes a guide rod and a plug that are fixedly connected, the guide rod is threadedly connected to the nut, and the guide rod drives the plug to reciprocate.

[0016] In one embodiment, the valve needle assembly further includes a spring, and two ends of the spring are respectively connected to the plug and the guide rod.

[0017] In a second aspect, an embodiment of the present application further provides a thermal management system, which includes a sealed cavity and the above-mentioned electronic expansion valve.

[0018] In a third aspect, an embodiment of the present application further provides a vehicle, the vehicle comprising the above-mentioned electronic expansion valve or thermal management system.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal cross-section of an electronic expansion valve provided in one embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of an electronic expansion valve provided in one embodiment of the present application;

[0022] Figure 3 A partial cross-sectional schematic diagram of an electronic expansion valve provided in one embodiment of the present application;

[0023] Figure 4 A partial structural schematic diagram of an electronic expansion valve provided in one embodiment of the present application;

[0024] Figure 5 A partial structural schematic diagram of an electronic expansion valve from a perspective provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a portion of the structure of an electronic expansion valve from another perspective provided in one embodiment of the present application;

[0026] Figure 7 A schematic diagram of a portion of the structure of an electronic expansion valve from another perspective provided in one embodiment of the present application;

[0027] Figure 8 A partial cross-sectional schematic diagram of an electronic expansion valve provided in one embodiment of the present application;

[0028] Fig. 9 This is a partial structural schematic diagram of a valve body provided in one embodiment of the present application;

[0029] Fig.10 A partial cross-sectional schematic diagram of a valve body provided in one embodiment of the present application;

[0030] Fig.11 A schematic diagram of the structure of a guide seat from a viewing angle provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of the structure of a guide seat from another perspective provided in an embodiment of the present application;

[0032] Fig.13 A schematic diagram of the structure of a guide seat from another perspective provided in an embodiment of the present application;

[0033] Fig.14 A schematic diagram of the structure of a guide seat from another perspective provided in an embodiment of the present application;

[0034] Fig.15 A cross-sectional schematic diagram of a guide seat provided in an embodiment of the present application;

[0035] Fig.16 A schematic structural diagram of a valve needle assembly from a perspective provided in an embodiment of the present application;

[0036] Fig.17 A schematic structural diagram of a valve needle assembly from another perspective provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] The present application relates to a vehicle, in which an electronic expansion valve or a thermal management system is provided, and the thermal management system can adjust the temperature of the interior space or components of the vehicle, for example, adjust the temperature of the interior space of the vehicle compartment, and adjust the temperature of components such as the engine, gearbox, battery or motor.

[0040] See also Figure 1 and Figure 2 ,in, Figure 1 The figure shows an internal cross-sectional view of an electronic expansion valve 100 provided in one embodiment of the present application; Figure 2 A structural schematic diagram of an electronic expansion valve 100 provided in an embodiment of the present application is illustrated.

[0041] The electronic expansion valve 100 provided in the present application includes a valve body 10, a valve needle assembly 20 and a guide seat 30. The valve body 10 is roughly cylindrical. The valve body 10 includes an inner cavity 11. The valve needle assembly 20 and the guide seat 30 are both located in the inner cavity 11. The guide seat 30 is suitable for cooperating with the valve needle assembly 20 to limit the rotation of the valve needle assembly 20. The guide seat 30 of the electronic expansion valve 100 and the inner wall of the valve body 10 cooperate to limit the relative rotation between the guide seat 30 and the valve body 10.

[0042] Specifically, in one embodiment, Figure 1As shown, the valve body 10 includes a valve port 12, which is connected to the inner cavity 11. The valve port 12 includes a first valve port 121 and a second valve port 122. The first valve port 121 is located at one end of the valve body 10 facing the plug 21, and the second valve port 122 is located on the outer wall of the valve body 10. The first valve port 121 and the second valve port 122 are respectively connected to the closed cavity. The valve needle assembly 20 includes a plug 21 and a guide rod 22. The plug 21 slides toward the first valve port 121 along the axial direction of the guide rod 22 under the drive of the guide rod 22. When the plug 21 does not cover the first valve port 121, the first valve port 121 is connected to the second valve port 122, so that the two sealed cavities are also connected. At this time, the electronic expansion valve 100 is in an open state; when the plug 21 covers the first valve port 121, the first valve port 121 is not connected to the second valve port 122, so that the closed cavities respectively connected to the first valve port 121 and the second valve port 122 are not connected. At this time, the electronic expansion valve 100 is in a closed state.

[0043] It can be understood that in the existing electronic expansion valve, the guide rod in the valve needle assembly cooperates with the nut thread to drive the plug to move back and forth, thereby opening or closing the electronic expansion valve. However, the rotation of the guide rod will cause the plug to have a tendency to rotate, thereby causing the part of the plug that cooperates with the first valve port to be worn. In the related technology, the guide seat is used to stop the guide rod from rotating, thereby avoiding rotation between the guide rod and the guide seat. However, the outer peripheral surface of the guide seat is a smooth cylindrical surface, and the inner wall of the valve body is also a smooth cylindrical surface. Under the action of the rotational force of the guide rod, the guide seat also has the risk of rotation, which will affect the restriction on the rotation tendency of the plug and even cause the guide rod to be unable to move axially normally, causing the electronic expansion valve to fail.

[0044] The electronic expansion valve 100 of the present application is provided with an anti-rotation structure between the valve needle assembly 20 and the guide seat 30, and between the guide seat 30 and the valve body 10 to limit the relative rotation between the valve needle assembly 20 and the guide seat 30, and between the guide seat 30 and the valve body 10, so as to prevent the guide seat 30 from rotating with the valve needle assembly 20, thereby ensuring the normal operation of the electronic expansion valve 100, further reducing the wear between the plug 21 and the valve port, and making it more reliable.

[0045] It should be noted that the anti-rotation fit can be the anti-rotation fit described below by respectively setting a protrusion and a groove on the two, or it can be formed by setting the outer peripheral wall of the guide seat to a square, hexagon, etc., and at least a part of the inner wall of the inner cavity of the valve body forms a square, hexagon, etc. to correspond to the guide seat for anti-rotation fit, or it can be other forms of anti-rotation fit, as long as it can limit the relative rotation between the guide seat and the valve body.

[0046] 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 or the above-mentioned vehicle, but the electronic expansion valve 100 is not limited to application in thermal management systems or vehicles. 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.

[0047] See also Figure 3 and Figure 4 ,in, Figure 3 A partial cross-sectional schematic diagram of an electronic expansion valve 100 provided in one embodiment of the present application is illustrated; Figure 4 A partial structural schematic diagram of an electronic expansion valve 100 provided in an embodiment of the present application is illustrated.

[0048] In one embodiment, one of the guide seat 30 and the inner wall of the valve body 10 is provided with a protrusion 32 , and the other is provided with a groove 111 , and the protrusion 32 extends into the groove 111 to limit the relative rotation between the guide seat 30 and the valve body 10 .

[0049] In one embodiment, a plurality of protrusions 32 are provided, and a plurality of grooves 111 are provided.

[0050] Specifically, in one embodiment, Figure 1 As shown, the guide seat 30 is provided with two protrusions 32, which are arranged on the outer side wall of the guide seat 30 and are respectively located on two opposite sides, and the protrusions 32 extend in a direction away from the axis of the guide seat 30. The inner cavity 11 is provided with two grooves 111, which are arranged on the inner side wall of the inner cavity 11 and are respectively located on two opposite sides. Each protrusion 32 extends into each groove 111, so that the guide seat 30 and the valve body 10 are relatively fixed to limit the relative rotation between the guide seat 30 and the valve body 10.

[0051] In another embodiment, the inner wall of the inner cavity 11 may be provided with a protrusion 32, which extends toward the guide seat 30. The outer wall of the guide seat 30 may be provided with a groove 111, and the protrusion 32 extends into the groove 111, which can also limit the relative rotation between the guide seat 30 and the valve body 10.

[0052] In other embodiments, the number and positions of the mutually cooperating protrusions 32 and recesses 111 in the electronic expansion valve 100 can be set according to the desired anti-rotation effect and the position of the guide seat 30 in the inner cavity 11 .

[0053] See also Figure 5-Figure 11 ,in, Figure 5 A partial structural schematic diagram of an electronic expansion valve 100 provided in one embodiment of the present application is illustrated; Figure 6A partial structural schematic diagram of an electronic expansion valve 100 from another perspective provided in an embodiment of the present application is illustrated; Figure 7 A partial structural schematic diagram of an electronic expansion valve 100 from another perspective provided in an embodiment of the present application is illustrated; Figure 8 A partial cross-sectional schematic diagram of an electronic expansion valve 100 provided in one embodiment of the present application is illustrated; Fig. 9 A partial structural schematic diagram of a valve body 10 provided in an embodiment of the present application is illustrated; Fig.10 A partial cross-sectional schematic diagram of a valve body 10 provided in an embodiment of the present application is illustrated; Fig.11 A structural schematic diagram of a guide seat 30 provided in an embodiment of the present application is illustrated.

[0054] In one embodiment, if Figure 5 , Figure 7 , Fig. 9 and Fig.11 As shown, the protrusion 32 is substantially an arc-shaped protrusion, the contour of the groove 111 is matched with the contour of the protrusion 32 , and the protrusion 32 extends into the groove 111 .

[0055] In the above embodiment, the profiles of the groove 111 and the protrusion 32 cooperate with each other to limit the relative rotation between the guide seat 30 and the valve body 10. In other embodiments, the shapes and sizes of the groove 111 and the protrusion 32 can be different, and the relative rotation between the guide seat 30 and the valve body 10 can also be limited.

[0056] See also Figure 12-Figure 15 ,in Fig.12 A schematic structural diagram of a guide seat 30 from another perspective provided in an embodiment of the present application is shown; Fig.13 A schematic structural diagram of a guide seat 30 from another perspective provided in an embodiment of the present application is shown; Fig.14 A schematic structural diagram of a guide seat 30 from another perspective provided in an embodiment of the present application is shown; Fig.15 A cross-sectional schematic diagram of a guide seat 30 provided in an embodiment of the present application is illustrated.

[0057] In one embodiment, the guide seat 30 includes a main body and a through hole 31 passing through the main body, and the valve needle assembly 20 includes a stop member 23, and the stop member 23 is at least partially located in the through hole 31. The through hole 31 and the stop member 23 cooperate to limit the relative rotation of the valve needle assembly 20 and the guide seat 30, thereby reducing the wear between the valve needle assembly and the valve body and increasing the service life of the electronic expansion valve 100.

[0058] In one embodiment, the guide seat 30 divides the inner cavity 11 into a first sub-cavity 112 and a second sub-cavity 113, and the through hole 31 is used to connect the first sub-cavity 112 and the second sub-cavity 113. The through hole 31 can connect the first sub-cavity 112 and the second sub-cavity 113 on both sides of the guide seat 30 to balance the pressure on both sides of the guide seat 30, reduce the pressure difference between the first sub-cavity 112 and the second sub-cavity 113, and avoid excessive pressure difference from damaging the components in the electronic expansion valve 100.

[0059] In one embodiment, if Figure 11-Figure 15 As shown, the guide seat 30 divides the inner cavity 11 into a first sub-cavity 112 and a second sub-cavity 113, the first sub-cavity 112 and the second sub-cavity 113 are respectively located on both sides of the guide seat 30, and the plug 21 is located in the first sub-cavity 112. A gap is left between the stopper 23 and the through hole 31, and the gap is used to connect the first sub-cavity 112 and the second sub-cavity 113. The gap can reduce the pressure difference between the first sub-cavity 112 and the second sub-cavity 113, and avoid excessive pressure difference causing damage to the valve body 10, which affects the normal operation of the electronic expansion valve 100.

[0060] In one embodiment, if Figure 11-Figure 15 As shown, the diameter of the through hole 31 is greater than the diameter of the guide rod 22 , the guide rod 22 passes through the through hole 31 , and the gap between the guide rod 22 and the through hole 31 is used to form a part of the gap connecting the first sub-cavity 112 and the second sub-cavity 113 .

[0061] In one embodiment, if Figure 7 , Figure 8 , Fig.11 and Fig.13 As shown, the protrusion 32 is provided with a flow channel groove 33, the flow channel groove 33 is used to connect the groove 111 and the through hole 31, the groove 111 is used to communicate with the second sub-chamber 113, and the second sub-chamber 113 is located on the side of the guide seat 30 away from the valve port 12, so that the through hole 31 is connected with the second sub-chamber 113 through the flow channel groove 33 and the groove 111, so as to quickly eliminate the pressure difference between the first sub-chamber 112 and the second sub-chamber 113 of the electronic expansion valve 100.

[0062] In one embodiment, the flow channel groove 33 extends in a direction perpendicular to the axial direction of the valve needle assembly 20, reducing the length of the flow channel groove 33 so that the path between the groove 111 and the through hole 31 is shorter to quickly eliminate the pressure difference between the first sub-cavity 112 and the second sub-cavity 113.

[0063] In one embodiment, if Fig.11 As shown, the end surface of the guide seat 30 is provided with a flow channel groove 33, and one end of the flow channel groove 33 is connected to the through hole 31. Figure 3As shown, the flow channel groove 33 is located on the end surface of the guide seat 30 facing the second sub-cavity 113, the inner cavity 11 is provided with a groove 111, and the groove 111 extends to the side of the bearing 50 away from the guide seat 30, and the flow channel groove 33 is connected with the groove 111. The flow channel groove 33 is used to connect the through hole 31 and the groove 111, so that the through hole 31 is connected with the second sub-cavity 113, and the flow channel between the two ends of the bearing 50 is expanded to quickly eliminate the pressure difference between the first sub-cavity 112 and the second sub-cavity 113.

[0064] In one embodiment, if Figure 3 and Fig.11 As shown, the inner cavity 11 is provided with two grooves 111, and the end surface of the guide seat 30 is provided with two flow channel grooves 33, and the two flow channel grooves 33 respectively connect the through hole 31 with different grooves 111. In other embodiments, the number and position of the flow channel grooves 33 can be set according to the position of the groove 111. In one embodiment, the electronic expansion valve 100 includes a drive assembly 40 and a nut 60, the nut 60 is located in the second sub-chamber 113, the nut 60 is threadedly connected to the valve needle assembly 20, the drive assembly 40 is used to drive the nut 60 to rotate and drive the valve needle assembly 20 to move, and the rotation of the nut 60 drives the valve needle assembly 20 to move along the axial direction of the valve needle assembly 20, thereby realizing the opening and closing of the electronic expansion valve 100.

[0065] In one embodiment, the valve needle assembly 20 includes a guide rod 22 and a plug 21 that are fixedly connected. The guide rod 22 is threadedly connected to the nut 60 . The guide rod 22 drives the plug 21 to move back and forth to open and close the electronic expansion valve 100 .

[0066] In one embodiment, if Figure 3 As shown, the electronic expansion valve 100 includes a nut 60, which is located in the second sub-chamber 113 and is provided with a threaded hole. The end of the guide rod 22 away from the plug 21 is provided with an external thread and extends into the threaded hole, so that the guide rod 22 is threadedly connected to the nut 60.

[0067] In another embodiment, an external thread can be set on the nut 60, and a threaded hole can be set on the guide rod 22, and the nut 60 extends into the threaded hole so that the external thread of the nut 60 cooperates with the internal thread of the threaded hole, and the threaded connection between the guide rod 22 and the nut 60 can also be realized.

[0068] In one embodiment, if Figure 1 and Figure 2 As shown, the electronic expansion valve 100 includes a drive assembly 40, which is sleeved on the outside of the valve body 10 and located at an end away from the valve port 12. The drive assembly 40 can drive the nut 60 to rotate and drive the guide rod 22 to move, thereby realizing the opening and closing of the electronic expansion valve 100.

[0069] In one embodiment, the driving assembly 40 includes a stator, and a rotor is disposed outside the nut 60. When the stator is energized, a magnetic field is generated. The magnetic field passes through the rotor and drives the rotor to rotate. The rotor drives the nut 60 to rotate and transmits it to the plug 21 through the guide rod 22, thereby driving the plug 21 to slide in the first sub-cavity 112.

[0070] In one embodiment, if Figure 3 As shown, the electronic expansion valve 100 includes a bearing 50, which is fixed in the inner cavity. The bearing 50 is located on the side of the guide seat 30 facing the second sub-cavity 113 along the axial direction of the guide rod 22. The bearing 50 includes an outer ring and an inner ring. The outer ring is fixed in the second sub-cavity 113, the inner ring is fixedly connected to the nut 60, the outer ring is rotatably connected to the inner ring, and the bearing 50 supports the nut 60 and makes the nut 60 rotatably connected to the valve body 10.

[0071] It can be understood that a bearing gap is left between the outer ring and the inner ring, and the bearing gap connects the two ends of the bearing 50, so that the first sub-cavity 112 is connected to the second sub-cavity 113 through the through hole 31 and the bearing gap.

[0072] See also Fig.16 and Fig.17 ,in, Fig.16 A schematic structural diagram of a valve needle assembly 20 from a perspective provided in an embodiment of the present application is illustrated; Fig.17 A schematic structural diagram of a valve needle assembly 20 from another perspective provided in an embodiment of the present application is illustrated.

[0073] In one embodiment, if Figure 11-Figure 15 As shown, the electronic expansion valve 100 is provided with a stop member 23, which is fixed to the guide rod 22 and is located in a through hole 31. The through hole 31 includes a stop groove 311. The stop member 23 extends toward the stop groove 311 and extends into the stop groove 311. The stop member 23 cooperates with the stop groove 311 to limit the relative rotation between the guide rod 22 and the guide seat 30, thereby reducing the wear caused by the relative rotation of the plug 21 and the valve body 10.

[0074] In one embodiment, the stop member 23 includes a main body and a stop portion, which extends in a direction away from the geometric center of the stop member 23 and extends into the stop groove 311 to limit the relative rotation between the stop member 23 and the guide seat 30.

[0075] In this embodiment, a gap is left between the anti-rotation portion and the anti-rotation groove 311 and / or between the body and the through hole 31 , and the gap is used to connect the first sub-cavity 112 and the second sub-cavity 113 .

[0076] In one embodiment, if Fig.16 and Fig.17 As shown, the anti-rotation member 23 is roughly rectangular. Fig.14As shown, the through hole 31 is provided with two opposite anti-rotation grooves 311, which are roughly rectangular. The long sides of the anti-rotation member 23 extend into the anti-rotation grooves 311 to limit the relative rotation between the anti-rotation member 23 and the guide seat 30, thereby ensuring the anti-rotation effect of the guide rod 22 and the plug 21.

[0077] In this embodiment, the through hole 31 includes an arc-shaped inner wall, and a gap is left between the long side of the rotation-stopping member 23 and the arc-shaped inner wall, so that the first sub-cavity 112 and the second sub-cavity 113 are connected through the gap.

[0078] In other embodiments, the shape and size of the stopper portion and the stop groove 311 may be different, and the shape and size of the main body and the through hole 31 may also be different, thereby limiting the relative rotation between the plug 21 and the valve body 10, and connecting the first sub-cavity 112 and the second sub-cavity 113 through the gap between the stopper 23 and the through hole 31.

[0079] In one embodiment, if Fig.16 and Fig.17 As shown, an extension portion is provided at one end of the plug 21, and the extension portion is conical, and the apex of the cone is located at the end of the extension portion away from the plug 21. The conical extension portion can better fit the valve port 12 to ensure the sealing effect when the electronic expansion valve 100 is closed. In other embodiments, the extension portion of the plug 21 can be set to other shapes to cover the valve port 12.

[0080] In one embodiment, the valve needle assembly 20 includes a spring 211, and the two ends of the spring 211 are respectively connected to the plug 21 and the guide rod 22. The two ends of the spring 211 are respectively connected to the plug 21 and the guide rod 22, so that the plug 21 and the guide rod 22 are elastically connected. During the movement of the guide rod 22, the spring 211 is in a compressed state and pushes the plug 21 to slide, so as to ensure the sealing of the electronic expansion valve 100 when the plug 21 covers the valve port 12.

[0081] In one embodiment, if Figure 1 As shown, the electronic expansion valve 100 includes a spring 211, which is embedded in the plug 21, and one end of the spring 211 abuts against the plug 21, and the other end abuts against the guide rod 22, so that an elastic connection is formed between the guide rod 22 and the plug 21. When the guide rod 22 slides toward the valve port 12, the spring 211 compresses and pushes the plug 21 to slide toward the valve port 12, so that the plug 21 can completely cover the valve port 12, so as to ensure the sealing of the plug 21 and the inner cavity 11 when the electronic expansion valve 100 is closed.

[0082] In one embodiment, a gap is left between the plug 21 and the inner wall of the first sub-cavity 112 along its radial direction, and the heat exchange medium in the closed cavity can flow into the interior of the electronic expansion valve 100 through the gap between the valve port 12 and the plug 21 and the first sub-cavity 112. When the heat exchange medium is a liquid, the heat exchange medium can enter between the components that move relative to each other, provide lubrication for the components, reduce wear between the components, and make the electronic expansion valve 100 have a longer service life.

[0083] 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: It comprises a valve body, a valve needle assembly and a guide seat, wherein the valve body comprises an inner cavity, the valve needle assembly and the guide seat are located in the inner cavity, and the guide seat is suitable for cooperating with the valve needle assembly to limit the rotation of the valve needle assembly; The guide seat and the inner wall of the valve body are anti-rotationally matched to limit the relative rotation between the guide seat and the valve body.

2. The electronic expansion valve according to claim 1, characterized in that: One of the guide seat and the inner wall of the valve body is provided with a protrusion, and the other is provided with a groove, and the protrusion extends into the groove to limit the relative rotation between the guide seat and the valve body.

3. The electronic expansion valve according to claim 2, characterized in that: There are a plurality of protrusions and a plurality of grooves.

4. The electronic expansion valve according to claim 2, characterized in that: The protrusion is substantially an arc-shaped protrusion, and the contour of the groove is matched with the contour of the protrusion.

5. The electronic expansion valve according to claim 2, characterized in that: The guide seat includes a body and a through hole passing through the body, and the valve needle assembly includes a stopper, which is at least partially located in the through hole. The through hole and the stopper cooperate to limit the relative rotation of the valve needle assembly and the guide seat.

6. The electronic expansion valve according to claim 5, characterized in that: The guide seat divides the inner cavity into a first sub-cavity and a second sub-cavity, and the through hole 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 protruding portion is provided with a flow channel groove, the flow channel groove is used to connect the groove and the through hole, the groove is used to communicate with the second sub-cavity, and the second sub-cavity is located on the side of the guide seat away from the valve port.

8. The electronic expansion valve according to claim 7, characterized in that: The flow channel groove extends in a direction perpendicular to the axial direction of the valve needle assembly.

9. The electronic expansion valve according to any one of claims 1 to 8, characterized in that: The electronic expansion valve comprises a driving assembly and a nut. The nut is located in the inner cavity and is threadedly connected to the valve needle assembly. The driving assembly is used to drive the nut to rotate and drive the valve needle assembly to reciprocate.

10. The electronic expansion valve according to claim 9, characterized in that: The electronic expansion valve comprises a bearing, which is fixed in the inner cavity and used for supporting the nut to rotate.

11. The electronic expansion valve according to claim 9, characterized in that: The valve needle assembly comprises a guide rod and a plug which are fixedly connected. The guide rod is threadedly connected to the nut, and the guide rod drives the plug to move back and forth.

12. The electronic expansion valve according to claim 11, characterized in that: The valve needle assembly also includes a spring, and two ends of the spring are respectively connected to the plug and the guide rod.

13. A thermal management system, characterized in that: Comprising the electronic expansion valve as described in any one of claims 1-12.

14. A vehicle, characterized in that: A thermal management system comprising the electronic expansion valve according to any one of claims 1 to 12 or claim 13.

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