Valve needle assembly of electronic expansion valve, electronic expansion valve, thermal management system, and vehicle

Abstract

A valve needle assembly (20) of an electronic expansion valve, an electronic expansion valve, a thermal management system, and a vehicle. The valve needle assembly (20) of the electronic expansion valve comprises: a valve stem (21), wherein the valve stem (21) is provided with a first stop surface (215) and a second stop surface (216); a valve needle (22), wherein the valve needle (22) is provided with a stop member (23), and the valve needle (22) is movable relative to the valve stem (21) to allow the stop member (23) to switch between abutting against the first stop surface (215) and abutting against the second stop surface (216); and an elastic member (44), wherein the elastic member (44) applies to the valve needle (22) an acting force in the direction moving away from the valve stem (21).

Description

Valve needle assembly of electronic expansion valve, electronic expansion valve, thermal management system and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 2023224015821 and application date August 31, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of electronic expansion valves, and in particular to a valve needle assembly of an electronic expansion valve, an electronic expansion valve, a thermal management system, and a vehicle. Background Art

[0004] The valve core in the electronic expansion valve in the related art can open or close the valve port by reciprocating movement, but there is a problem that the valve core and the valve port are not tightly matched, resulting in leakage.

[0005] Application Contents

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a valve needle assembly for an electronic expansion valve. The valve needle assembly utilizes an elastic member to apply a force toward the valve port to the valve needle, thereby enabling the valve needle to fully seal the valve port, reducing the possibility of leakage when the electronic expansion valve is closed, and facilitating an improvement in the qualified rate of the electronic expansion valve.

[0007] The present application also provides an electronic expansion valve having a valve needle assembly, a thermal management system, and a vehicle.

[0008] According to the first aspect of the present application, the valve needle assembly of the electronic expansion valve includes: a valve stem, the valve stem is provided with a first stop surface and a second stop surface, the first stop surface and the second stop surface are arranged at intervals in the moving direction of the valve stem; a valve needle, the valve needle is provided with a stop member, at least a portion of the stop member is located between the first stop surface and the second stop surface, the valve needle is movable relative to the valve stem so that the stop member switches between the first stop surface and the second stop surface; an elastic member, the elastic member is respectively connected to the valve stem and the valve needle, and the elastic member applies a force toward the valve needle in a direction away from the valve stem.

[0009] According to the embodiment of the present application, the valve needle assembly of the electronic expansion valve utilizes the stopping force between the stop member and the two stop surfaces to accurately control the compression amount of the elastic member, thereby accurately controlling the magnitude of the force applied by the elastic member to the valve needle toward the valve port, so that the valve needle can fully block the valve port, reducing the possibility of leakage of the electronic expansion valve when closing the valve port, thereby facilitating improving the qualified rate of the electronic expansion valve.

[0010] In addition, the valve needle assembly of the electronic expansion valve according to the above embodiment of the present application may also have the following additional technical features:

[0011] According to some embodiments of the present application, the end of the valve stem facing the valve needle includes a first part and a second part, the first part is located on the side of the second part facing the valve needle, the diameter of the first part is larger than the diameter of the second part, and the end surface of the first part extending beyond the second part defines the first stop surface.

[0012] According to some optional embodiments of the present application, the valve stem further includes a guide block, which is sleeved onto the valve stem, and an end surface of the guide block facing the first stop surface defines the second stop surface.

[0013] In some embodiments, the guide sleeve and the valve stem are integral.

[0014] According to some specific embodiments of the present application, the valve stem also includes a third part, which is connected to the second part, the diameter of the second part is larger than the diameter of the third part, and the guide block is externally mounted on the third part and stops at the second part.

[0015] According to some optional embodiments of the present application, the valve stem further has a guide surface, which is located on a side of the third portion facing away from the second portion, and the guide surface extends obliquely toward the third portion to guide the installation of the guide block.

[0016] In some embodiments, a cross-sectional diameter of the guide surface along the radial direction of the valve stem gradually increases in a direction from the valve stem to the valve needle.

[0017] According to some embodiments of the present application, a receiving cavity is provided in the valve needle, and the elastic member is provided in the receiving cavity.

[0018] According to some optional embodiments of the present application, a side wall of the accommodating cavity is provided with a communicating hole penetrating the side wall.

[0019] According to some embodiments of the present application, a moving distance of the stopper in the moving direction of the valve stem is between 0.1 mm and 0.3 mm.

[0020] According to the second aspect of the present application, an electronic expansion valve is proposed, which includes: a valve seat assembly, which is provided with a valve port; and a valve needle assembly, which is the valve needle assembly of the electronic expansion valve according to the embodiment of the first aspect of the present application.

[0021] According to the electronic expansion valve of the embodiment of the present application, by utilizing the valve needle assembly described in the embodiment of the first aspect of the present application, an elastic member is used to apply a force toward the valve port to the valve needle so that the valve needle can fully block the valve port, thereby reducing the possibility of leakage of the electronic expansion valve when closing the valve port, thereby facilitating improving the qualified rate of the electronic expansion valve.

[0022] According to some embodiments of the present application, the electronic expansion valve further includes: a conversion member, which cooperates with the valve needle assembly to convert the rotation of the conversion member into reciprocating movement of the valve needle assembly.

[0023] In some embodiments, the electronic expansion valve further includes: a matching bearing, wherein the matching bearing is provided between the conversion member and the valve seat assembly.

[0024] According to an embodiment of a third aspect of the present application, a thermal management system is provided, which includes the electronic expansion valve according to the embodiment of the second aspect of the present application.

[0025] According to the thermal management system of the embodiment of the present application, by utilizing the electronic expansion valve described in the embodiment of the second aspect of the present application, an elastic member is used to apply a force toward the valve port to the valve needle so that the valve needle can fully block the valve port, thereby reducing the possibility of leakage of the electronic expansion valve when closing the valve port, thereby facilitating improving the pass rate of the electronic expansion valve.

[0026] According to a fourth aspect of the present application, a vehicle is provided. The vehicle includes the thermal management system according to the embodiment of the third aspect of the present application.

[0027] According to the vehicle of the embodiment of the present application, by utilizing the thermal management system described in the embodiment according to the third aspect of the present application, an elastic member is used to apply a force toward the valve port to the valve needle so that the valve needle can fully block the valve port, thereby reducing the possibility of leakage of the electronic expansion valve when closing the valve port, thereby facilitating improving the qualification rate of the electronic expansion valve.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] FIG1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present application;

[0031] FIG2 is a cross-sectional view of FIG1 at AA;

[0032] FIG3 is a schematic structural diagram of a valve needle assembly according to an embodiment of the present application;

[0033] FIG4 is a schematic structural diagram of a valve needle assembly according to an embodiment of the present application;

[0034] FIG5 is a cross-sectional view at BB in FIG4 ;

[0035] FIG6 is a schematic structural diagram of a valve stem, a guide block, and a stopper according to an embodiment of the present application;

[0036] FIG7 is a schematic structural diagram of a valve stem, a guide block, and a stopper according to an embodiment of the present application;

[0037] FIG8 is a cross-sectional view of the structure of the valve stem, the guide block and the stopper according to an embodiment of the present application;

[0038] FIG9 is a schematic structural diagram of a valve stem and a stopper according to an embodiment of the present application;

[0039] FIG10 is a cross-sectional view of the structure of the valve stem and the stopper according to an embodiment of the present application;

[0040] FIG11 is a schematic structural diagram of a valve stem according to an embodiment of the present application;

[0041] FIG12 is a schematic structural diagram of a guide block according to an embodiment of the present application;

[0042] FIG13 is a schematic structural diagram of a stopper according to an embodiment of the present application;

[0043] FIG14 is a schematic structural diagram of a stopper according to an embodiment of the present application;

[0044] FIG15 is a schematic structural diagram of a guide block according to an embodiment of the present application;

[0045] FIG16 is a schematic structural diagram of a guide block according to an embodiment of the present application;

[0046] FIG17 is a cross-sectional view of a guide pad according to an embodiment of the present application;

[0047] FIG18 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0048] Reference numerals: electronic expansion valve 1, valve seat assembly 10, valve port 131,

[0049] Valve needle assembly 20, first part 201, second part 202, third part 203,

[0050] Valve stem 21, guide surface 211, first step portion 212, first stop surface 215, second stop surface 216,

[0051] Valve needle 22, accommodating cavity 221, communicating hole 223, stopper 23, first mating surface 231, second mating surface 232,

[0052] Guide seat 30, moving cavity 31, limiting surface 311, manufacturing hole 39, guide block 41, matching bearing 42, inner ring assembly 421, outer ring assembly 422, elastic member 44,

[0053] Transformer 50 , rotor assembly 60 , vehicle 91 , thermal management system 92 . DETAILED DESCRIPTION

[0054] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0055] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "vertical", "width", "thickness", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0058] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0059] The valve needle assembly 20 of the electronic expansion valve 1 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0060] As shown in FIG. 5 , the valve needle assembly 20 of the electronic expansion valve 1 according to an embodiment of the present application includes a valve stem 21 , a valve needle 22 and an elastic member 44 .

[0061] The electronic expansion valve 1 includes a valve seat assembly 10, which defines a valve port 131. The valve needle assembly 20 can move back and forth within the valve seat assembly 10 to open or close the valve port 131. The elastic member 44 is respectively connected to the valve stem 21 and the valve needle 22. The elastic member 44 applies a force toward the valve needle 22 in a direction away from the valve stem 21, so as to increase the force between the valve needle 22 and the valve port 131 when the valve needle 22 closes the valve port 131, so that the valve needle 22 can fully close the valve port 131, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the qualified rate of the electronic expansion valve 1.

[0062] Among them, the valve stem 21 is provided with a first stop surface 215 and a second stop surface 216, and the first stop surface 215 and the second stop surface 216 are arranged at intervals in the moving direction of the valve stem 21, and the valve needle 22 is provided with a stop member 23, at least a part of the stop member 23 is located between the first stop surface 215 and the second stop surface 216, and the valve needle 22 is movable relative to the valve stem 21 so that the stop member 23 switches with the first stop surface 215 and the second stop surface 216 to stop, and the first stop surface 215 and the second stop surface 216 can be used to control the range of movement of the valve needle 22 relative to the valve stem 21. Since the elastic member 44 is respectively connected to the valve stem 21 and the valve needle 22, by controlling the range of movement of the valve needle 22 relative to the valve stem 21, the compression amount of the elastic member 44 can be controlled, and then the magnitude of the force exerted by the elastic member 44 on the valve needle 22 can be controlled, so as to ensure that the valve needle 22 can fully close the valve port 131 while avoiding failure of the elastic member 44.

[0063] Therefore, according to the embodiment of the present application, the valve needle assembly 20 of the electronic expansion valve 1 uses the elastic member 44 to apply a force to the valve needle 22 toward the valve port 131, so that the valve needle 22 can fully block the valve port 131, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the pass rate of the electronic expansion valve 1.

[0064] The electronic expansion valve 1 according to a specific embodiment of the present application is described below with reference to the accompanying drawings.

[0065] As shown in FIG. 5 , the valve needle assembly 20 of the electronic expansion valve 1 according to an embodiment of the present application includes a valve stem 21 , a valve needle 22 and an elastic member 44 .

[0066] In some embodiments of the present application, as shown in Figures 5 and 11, the end of the valve stem 21 facing the valve needle 21 includes a first part 201 and a second part 202, the first part 201 is located on the side of the second part 202 facing the valve needle 22, the diameter of the first part 201 is larger than the diameter of the second part 202, and the end surface of the first part 201 that exceeds the second part 202 defines a first stop surface 215. When the valve stem 21 and the valve needle 22 move relative to each other, the distance between the stop member 23 and the first stop surface 215 gradually decreases and stops and fits, and the valve needle 22 and the valve stem 21 no longer continue to move relative to each other.

[0067] As shown in Figures 2 and 5, in this embodiment, the valve needle assembly 20 moves in the up and down directions to open or close the valve port 131, the first stop surface 215 is located below the second stop surface 216, and the stop member 23 includes a first mating surface 231 and a second mating surface 232. The first mating surface 231 is located below the second mating surface 232. When the valve needle assembly 20 closes the valve port 131, the second mating surface 232 is abutted against the second stop surface 216. When the valve needle assembly 20 opens the valve port 131, the first mating surface 231 is abutted against the first stop surface 215.

[0068] Among them, the first part 201 is formed as a first cylinder, the second part 202 is formed as a second cylinder, and the stopper 23 is sleeved on the second part 202. In the up and down directions, the distance between the first mating surface 231 and the second mating surface 232 is smaller than the length of the second part 202, so the stopper 23 can move in the up and down directions on the second part 202.

[0069] When the valve needle assembly 20 opens the valve port 131, the valve stem 21 moves upward. At this time, the valve needle 22 moves downward relative to the valve stem 21, the stop member 23 moves downward, and the first mating surface 231 is engaged with the first stop surface 215. At this time, the valve stem 21 drives the valve needle 22 to move upward through the first stop surface 215, so that the valve needle 22 can smoothly open the valve port 131.

[0070] When the valve needle assembly 20 closes the valve port 131, the valve stem 21 moves downward. At this time, the valve needle 22 moves upward relative to the valve stem 21, the stop member 23 moves upward and the second mating surface 232 is engaged with the second stop surface 216. At this time, the valve stem 21 drives the valve needle 22 to move downward through the second stop surface 216, so that the valve needle 22 can smoothly close the valve port 131.

[0071] In some optional embodiments of the present application, as shown in Figure 5, the valve stem 21 also includes a guide block 41, which is sleeved onto the valve stem 21, and the end surface of the guide block 41 facing the first stop surface 215 defines a second stop surface 216. When the valve stem 21 and the valve needle 22 move relative to each other, the distance between the stop member 23 and the second stop surface 216 gradually decreases and stops and fits, the valve needle 22 and the valve stem 21 no longer continue to move relative to each other.

[0072] In some embodiments, the electronic expansion valve 1 includes a valve seat assembly 10 and a guide seat 30, the valve seat assembly 10 defines a valve port 131, the guide seat 30 is fixed in the valve seat assembly 10, the guide seat 30 is provided with a movable chamber 31, and the guide block 41 is reciprocatingly arranged in the movable chamber 31. The guide block 41 cooperates with the guide seat 30 to limit the rotational freedom of the valve stem 21, so that the guide block 41 can only move in the movable chamber 31 but cannot rotate in the movable chamber 31, so that the valve stem 21 can only move in the valve seat assembly 10 but cannot rotate.

[0073] Specifically, since the guide block 41 is externally mounted on the valve stem 21, the rotational freedom of the guide block 41 can be restricted, so that the rotational freedom of the valve stem 21 and the valve needle 22 can be restricted. When the valve needle assembly 20 opens or closes the valve port 131, compared with the valve needle assembly 20 rotating and moving to close the valve port 131, the valve needle assembly 20 only moves back and forth in the valve seat assembly 10 without rotating relative to the valve needle assembly 20, thereby reducing the wear between the valve needle assembly 20 and the valve seat assembly 10 and reducing the noise generated between the valve needle assembly 20 and the valve seat assembly 10.

[0074] In some embodiments, as shown in FIG17 , a limiting surface 311 is provided on a side of the movable chamber 31 facing away from the valve port 131. The limiting surface 311 is adapted to cooperate with the guide block 41 to limit the movement of the guide block 41. By limiting the range of movement of the guide block 41, the range of movement of the valve needle assembly 20 can be limited, thereby controlling the extent to which the valve needle assembly 20 fully opens the valve port 131. Specifically, when the valve needle assembly 20 moves away from the valve port 131 to open the valve port 131, the guide block 41 cooperates with the limiting surface 311, and the valve needle assembly 20 stops moving. At this point, the valve needle assembly 20 fully opens the valve port 131.

[0075] In addition, since the guide seat 30 is fixed in the valve seat assembly 10, the guide seat 30 is stationary. When the valve needle assembly 20 moves back and forth to open the valve port 131, only relative movement and no relative rotation occur between the limiting surface 311 and the guide block 41. In this way, when the limiting surface 311 cooperates with the guide block 41, the friction between the limiting surface 311 and the guide block 41 is small and no rotational friction is generated, which facilitates reducing the noise generated in the electronic expansion valve 1.

[0076] In some examples, as shown in FIG15 , a plurality of manufacturing holes 39 are provided on the guide seat 30 to facilitate injection molding of the guide seat 30 . Specifically, the guide seat 30 defines a movable cavity 31 , which extends in the up-down direction. In the radial direction of the guide seat 30 , the wall thickness of the guide seat 30 is relatively thick. The manufacturing holes 39 extend in the up-down direction to reduce the wall thickness of the guide seat 30 , thereby reducing the possibility of deformation of the peripheral wall of the guide seat 30 when the guide seat 30 is injection molded.

[0077] In some embodiments, the outer peripheral wall of the guide block 41 is formed into a non-circular shape, and at least a portion of the inner wall of the movable chamber 31 is formed into a non-circular shape that cooperates with the guide block 41, so that when the guide block 41 has a tendency to rotate, the inner wall of the movable chamber 31 has a stopping force on the rotation of the guide block 41, so that the guide block 41 will not rotate in the movable chamber 31, and the rotation of the valve needle assembly 20 is restricted by the guide block 41, so that the valve needle assembly 20 will not rotate in the valve seat assembly 10, thereby reducing the wear between the valve needle assembly 20 and the valve seat assembly 10.

[0078] In some embodiments, the outer peripheral wall of the guide block 41 slides with at least a portion of the inner wall of the movable chamber 31. When the valve needle assembly 20 moves back and forth, the guide block 41 moves back and forth with the valve needle assembly 20. At this time, the inner wall of the movable chamber 31 can guide the moving direction of the guide block 41, so that the guide block 41 can move back and forth smoothly in the movable chamber 31, and then guide the movement of the valve needle assembly 20, so that the valve needle assembly 20 can smoothly open or close the valve port 131.

[0079] In some examples, as shown in Figures 12 and 15, the outer peripheral wall of the guide block 41 is formed into an oblong shape, and the inner wall of at least a portion of the movable chamber 31 is formed into an oblong shape to cooperate with the guide block 41 to prevent rotation. When the guide block 41 has a tendency to rotate, the inner wall of the movable chamber 31 has a stopping force on the outer peripheral wall of the guide block 41 to limit the rotation of the guide block 41, so that the guide block 41 can only move back and forth in the movable chamber 31 but cannot rotate, so that the valve needle assembly 20 can only move back and forth but cannot rotate, and thus when the valve needle assembly 20 moves back and forth to open or close the valve port 131, the friction between the valve needle assembly 20 and the valve seat assembly 10 can be reduced, thereby reducing the wear between the valve needle assembly 20 and the valve seat assembly 10.

[0080] In other examples, the outer peripheral wall of the guide block 41 can be formed into a triangle, square, hexagon, etc., and at least a portion of the inner wall of the movable cavity 31 in the guide seat 30 is correspondingly formed into a triangle, square, hexagon, etc. to cooperate with the guide block 41 to prevent rotation.

[0081] In some other embodiments, the outer peripheral wall of the guide block 41 is provided with one of a guide groove and a guide protrusion, and the inner wall of the movable cavity 31 is provided with the other of a guide protrusion and a guide groove. The guide protrusion extends into the guide groove and can slide in the guide groove, so that the moving direction of the guide block 41 can be guided by the cooperation of the guide protrusion and the guide groove. At the same time, when the guide block 41 has a tendency to rotate, the rotation of the guide block 41 is restricted by the cooperation of the guide protrusion and the guide groove, thereby restricting the rotation of the valve needle assembly 20.

[0082] For example, the outer wall of the guide block 41 is provided with a guide groove, and the inner wall of the movable cavity 31 is provided with a guide protrusion. The guide groove and the guide protrusion both extend in the up and down directions. When the valve needle assembly 20 moves in the up and down directions, the guide groove slides up and down, and the guide protrusion slides in the up and down directions in the guide groove to limit the moving direction of the guide block 41, and then limit the moving direction of the valve needle assembly 20, so that the valve needle assembly 20 can move back and forth smoothly up and down, and then the valve needle assembly 20 can smoothly open or close the valve port 131.

[0083] At the same time, when the valve needle assembly 20 has a tendency to rotate, since the guide protrusion extends into the guide groove and the guide seat 30 is fixed on the valve seat assembly 10, the side wall of the guide groove has a stopping force on the guide protrusion to limit the rotation of the guide block 41, so that the guide block 41 and the valve needle assembly 20 can only move back and forth up and down and cannot rotate, and then when the valve needle assembly 20 moves back and forth and when the valve needle assembly 20 opens or closes the valve port 131, the friction between the valve needle assembly 20 and the valve seat assembly 10 can be reduced, thereby reducing the wear between the valve needle assembly 20 and the valve seat assembly 10, and at the same time, it is convenient to reduce the noise generated in the electronic expansion valve 1.

[0084] In some embodiments, the guide sleeve 41 and the valve stem 21 are integrally formed, which reduces the number of installation steps and the complexity of the valve needle assembly 20 components. The guide sleeve 41 cooperates with the stopper 23 to control the compressive force on the elastic member 44. In other embodiments, the guide sleeve 41 and the valve stem 21 are separate structures, with the guide sleeve fixed to the valve stem 22.

[0085] In some specific embodiments of the present application, as shown in Figure 11, the valve stem 21 also includes a third part 203, the third part 203 is connected to the second part 202, the diameter of the second part 202 is larger than the diameter of the third part 203, and the guide block 41 is sleeved on the third part 203 and stops at the second part 202 to limit the position of the guide block 41 on the valve stem 21, so that the guide block 41 can be fixed at a specified position on the valve stem 21, and then the rotation of the valve stem 21 is limited by the cooperation of the guide block 41 and the guide seat 30.

[0086] In some embodiments, as shown in Figure 11, the valve stem 21 also has a guide surface 211, which is located on the side of the third part 203 away from the second part 202. The guide surface 211 extends obliquely toward the third part 203 to guide the installation of the guide block 41, so that the guide block 41 can be smoothly put on the third part 203, so that the guide block 41 is fixedly matched with the third part 203, and then the guide block 41 is fixed on the valve stem 21, so that the rotation of the valve stem 21 can be limited by utilizing the cooperation of the guide block 41 and the guide seat 30.

[0087] As shown in Figure 11, in this embodiment, the second part 202 is formed as a second cylinder, and the third part 203 is formed as a third cylinder. The diameter of the second part 202 is larger than the diameter of the third part 203. The end surface of the second part 202 that exceeds the third part 203 defines a first step portion 212. The guide block 41 is located between the guide surface 211 and the first step portion 212. The guide block 41 and the third part 203 are interference fit to limit the position of the guide block 41 on the valve stem 21. When the valve stem 21 moves back and forth, the valve stem 21 can drive the guide block 41 to move back and forth, thereby preventing the valve stem 21 from disengaging from the guide block 41 when the valve stem 21 moves back and forth, and then utilize the cooperation of the guide block 41 and the guide seat 30 to limit the rotation of the valve stem 21 and limit the movement displacement of the valve stem 21.

[0088] In some embodiments of the present application, the radial cross-sectional diameter of the guide surface 211 along the valve stem 21 gradually increases in the direction from the valve stem 21 to the valve needle 22. When the guide block 41 is moved in the direction from the valve stem 21 to the valve needle 22 to fix the guide block 41 to the third part 203, the gap between the guide block 41 and the third part 203 gradually decreases, so that the guide block 41 can be fixed on the third part 203.

[0089] In some embodiments of the present application, as shown in Figure 5, an accommodating chamber 221 is provided in the valve needle 22, and an elastic member 44 is provided in the accommodating chamber 221. When the valve needle 22 blocks the valve port 131, the elastic member 44 exerts a force on the valve needle 22 toward the valve port 131, so as to increase the force between the valve needle 22 and the valve port 131, so that the valve needle 22 can fully block the valve port 131, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the qualified rate of the electronic expansion valve 1.

[0090] In some embodiments, as shown in FIG5 , the elastic member 44 extends in the up-down direction. When the valve needle 22 blocks the valve port 131 , the elastic member 44 exerts a downward force on the valve needle 22 so that the valve needle 22 can fully block the valve port 131 , thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131 , thereby improving the qualified rate of the electronic expansion valve 1 .

[0091] In some embodiments, the lower end of the valve stem 21 extends into the accommodating chamber 221 and can move a certain distance in the accommodating chamber 221 to compress the elastic member 44 in the accommodating chamber 221 so that the elastic member 44 exerts a force on the valve needle 22 toward the valve port 131.

[0092] In some embodiments, the electronic expansion valve 1 includes a valve seat assembly 10 and a guide seat 30, the valve seat assembly 10 defines a valve port 131, the guide seat 30 is fixed in the valve seat assembly 10, the guide seat 30 is provided with a movable chamber 31, the valve stem 21 is provided with a guide block 41, the guide block 41 is reciprocatingly arranged in the movable chamber 31, the valve stem 21 is provided with a first stop surface 216, the guide block 41 is arranged above the first stop surface 216, and the guide block 41 defines a second stop surface 216 on the side facing the valve needle 22.

[0093] The valve needle 22 includes a stopper 23, which includes a first mating surface 231 and a second mating surface 232. The first mating surface 231 and the second mating surface 232 are located between the first stop surface 215 and the second stop surface 216. The first mating surface 231 is located below the second mating surface 232. When the valve needle assembly 20 closes the valve port 131, the second mating surface 232 is abutted against the second stop surface 216. When the valve needle assembly 20 opens the valve port 131, the first mating surface 231 is abutted against the first stop surface 215.

[0094] Among them, when the valve needle assembly 20 closes the valve port 131, the valve stem 21 and the guide block 41 move downward relative to the valve needle 22, the second stop surface 216 and the second mating surface 232 are abutted and engaged, and the valve stem 21 can drive the valve needle 22 to move downward so that the valve needle 22 can block the valve port 131. At the same time, the valve stem 21 compresses the elastic part 44 in the accommodating chamber 221, so that the elastic part 44 has a force on the valve needle 22 toward the valve port 131, so that the valve needle 22 can fully block the valve port 131.

[0095] Specifically, the second stop surface 216 and the second mating surface 232 are engaged with each other to control the length of the valve stem 21 extending into the accommodating cavity 221 , thereby controlling the compression amount of the elastic member 44 by the valve stem 21 to avoid failure of the elastic member 44 .

[0096] When the valve needle assembly 20 closes the valve port 131, when the valve stem 21 and the guide block 41 move upward relative to the valve needle 22, the valve needle 22 moves upward relative to the valve stem 21, the stop member 23 moves upward and the second mating surface 232 is abutted against the second stop surface 216. At this time, the valve stem 21 drives the valve needle 22 to move downward through the second stop surface 216, so that the valve needle 22 can smoothly close the valve port 131.

[0097] In some optional embodiments of the present application, as shown in Figure 3, the side wall of the accommodating chamber 221 is provided with a connecting hole 223 that passes through the side wall. The connecting hole 223 is used to balance the air pressure inside and outside the accommodating chamber 221. When the valve stem 21 compresses the elastic member 44 in the accommodating chamber 221, the air pressure in the accommodating chamber 221 is prevented from being compressed, thereby facilitating the reduction of the resistance encountered by the valve stem 21 when compressing the elastic member 44.

[0098] Furthermore, when the valve needle assembly 20 opens the valve port 131, external refrigerant enters the electronic expansion valve 1 and flows out of the valve port 131. The refrigerant entering the electronic expansion valve 1 can enter the accommodating chamber 221 through the communicating hole 223 to lubricate the elastic member 44 in the accommodating chamber 221. The refrigerant in the accommodating chamber 221 can flow into the valve seat assembly 10 to lubricate the components in the valve seat assembly 10, thereby reducing wear between the components.

[0099] In some embodiments of the present application, the movement distance of the stop member 23 in the movement direction of the valve stem is between 0.1 mm and 0.3 mm, that is, the range of relative movement between the valve stem 21 and the valve needle 22 is between 0.1 mm and 0.3 mm, so as to ensure that the elastic member 44 does not fail, and the elastic member 44 has a force on the valve needle 22, so that the valve needle 22 can fully block the valve port 131.

[0100] In some examples, the movement distance of the stopper 23 is 0.1 mm, 0.11 mm, 0.15 mm, 0.2 mm, 0.24 mm, 0.25 mm, 0.28 mm, or 0.3 mm.

[0101] In some embodiments, as shown in Figures 2 and 10, the valve needle assembly 20 can move back and forth in the up and down directions to open or close the valve port 131, the valve needle 22 defines an accommodating chamber 221, the valve needle 22 includes a stopper 23, and the valve stem 21 includes a first part 201, a second part 202 and a third part 203 arranged from bottom to top, the diameter of the first part 201 is greater than the diameter of the second part 202, and the end surface of the first part 201 that exceeds the second part 202 defines a first stop surface 215, the diameter of the second part 202 is greater than the diameter of the third part 203, and the end surface of the second part 202 that exceeds the third part 203 defines a first step portion 212.

[0102] The guide block 41 is sleeved on the third part 203, and the guide block 41 and the third part 203 are interference fit. The lower end of the guide block 41 is abutted against the first step portion 212, and the lower end surface of the guide block 41 defines a second stop surface 216. The stop member 23 is sleeved on the second part 202, and the stop member 23 includes a first mating surface 231 and a second mating surface 232. The length of the second part 202 along the up and down direction is H, and the length of the first mating surface 231 and the second mating surface 232 along the up and down direction is h, and H is greater than h, so that the stop member 23 can move back and forth in the up and down direction on the outside of the second part 202.

[0103] When the valve needle assembly 20 opens the valve port 131, the valve stem 21 moves upward, and at this time the first stop surface 215 and the stop member 23 are abutted against each other. At this time, the length of the elastic member 44 in the accommodating chamber 221 along the up and down directions is the longest. When the valve needle assembly 20 closes the valve port 131, the valve stem 21 moves downward, and the valve stem 21 moves downward relative to the valve needle 22 and compresses the elastic member 44 in the accommodating chamber 221. When the second stop surface 216 and the stop member 23 are abutted against each other, the length of the elastic member 44 in the accommodating chamber 221 along the up and down directions is the shortest.

[0104] The value of Hh is between 0.1 mm and 0.3 mm, so that the distance that the valve stem 21 moves downward relative to the valve needle 22 is between 0.1 mm and 0.3 mm, thereby controlling the compression amount of the elastic member 44 by the valve stem 21 .

[0105] In some examples, the electronic expansion valve 1 also includes a rotor assembly 60 and a conversion member 50. The rotor assembly 60 is fixedly matched with the conversion member 50 to drive the conversion member 50 to rotate. The conversion member 50 is threadedly matched with the valve stem 21. When the conversion member 50 rotates, the conversion member 50 drives the valve stem 21 to move back and forth in the up and down directions (it should be understood here that the above-mentioned direction limitation is only for the convenience of describing the accompanying drawings and will not limit the actual setting position and direction of the electronic expansion valve 1). It takes 96 steps for the motor to drive the rotor assembly 60 to rotate one circle. One rotation of the conversion member 50 can drive the valve needle assembly 20 to move 0.5 mm.

[0106] When the valve needle assembly 20 needs to open the valve port 131, the motor is set to take 38 steps to open the valve port 131, that is, the motor takes 38 steps to drive the valve stem 21 from the position of the compression elastic part 44 to the position of driving the valve needle 21 to move. In this process, the stop member 23 switches from the abutment with the second stop surface 216 to the abutment with the first stop surface 215.

[0107] Among them, the moving distance of the stopper 23 is 0.2mm, that is, the value of Hh is 0.2mm, that is, after the motor runs 38 steps, the conversion part drives the valve stem 21 to move upward 38 / 96*0.5≈0.2mm, at this time the second mating surface 232 and the second stop surface 216 are stopped and matched, and at this time the valve needle 22 begins to gradually open the valve port 131.

[0108] The electronic expansion valve 1 according to an embodiment of the present application is described below. The electronic expansion valve 1 according to the embodiment of the present application comprises a valve seat assembly 10, a valve needle assembly 20, and the valve needle assembly 20 of the electronic expansion valve 1 according to the above embodiment of the present application.

[0109] The valve seat assembly 10 defines a valve port 131 , and the valve needle assembly 20 can reciprocate within the valve seat assembly 10 to open or close the valve port 131 .

[0110] According to the electronic expansion valve 1 according to the embodiment of the present application, by utilizing the valve needle assembly 20 of the electronic expansion valve 1 according to the above-mentioned embodiment of the present application, a force is applied to the valve needle 22 so that the valve needle 22 can fully block the valve port 131, thereby reducing the possibility of liquid leakage in the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the qualified rate of the electronic expansion valve 1.

[0111] In some embodiments of the present application, the electronic expansion valve 1 also includes a conversion member 50, which cooperates with the valve needle assembly 20 to convert the rotation of the conversion member 50 into reciprocating movement of the valve needle assembly 20, so that the valve needle assembly 20 can move back and forth in the valve seat assembly 10 to open or close the valve port.

[0112] In some embodiments, the conversion member 50 is threadedly engaged with the valve stem 21. When the conversion member 50 rotates, the conversion member 50 can drive the valve stem 21 to move back and forth, and the valve stem 21 drives the valve needle 22 to move back and forth, so that the valve needle 22 can smoothly open or close the valve port 131.

[0113] In some embodiments of the present application, the electronic expansion valve 1 also includes a mating bearing 42, which is arranged between the conversion member 50 and the valve seat assembly 10. The mating bearing 42 is used to support the rotation of the conversion member 50 so that the conversion member 50 can rotate smoothly, so that the conversion member 50 can smoothly drive the valve needle assembly 20 to move back and forth, and so that the valve needle assembly 20 can smoothly open or close the valve port 131.

[0114] In some embodiments, the mating bearing 42 includes an inner ring assembly 421 and an outer ring assembly 422, the outer ring assembly 422 is fixed on the valve seat assembly 10, and the inner ring assembly 421 is fixed on the conversion member 50. When the conversion member 50 rotates, the conversion member 50 can drive the inner ring assembly 421 to rotate, so that the conversion member 50 can rotate relative to the valve seat assembly 10, so that the conversion member 50 can smoothly drive the valve needle assembly 20 to move back and forth.

[0115] The following describes a thermal management system 92 according to an embodiment of the present application. The thermal management system 92 according to an embodiment of the present application includes the electronic expansion valve 1 according to the above-mentioned embodiment of the present application.

[0116] According to the thermal management system 92 of the embodiment of the present application, by utilizing the electronic expansion valve 1 according to the above-mentioned embodiment of the present application, the elastic member 44 is used to apply a force toward the valve port 131 to the valve needle 22, so that the valve needle 22 can fully block the valve port 131, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the qualified rate of the electronic expansion valve 1.

[0117] A vehicle 91 according to an embodiment of the present application will be described below with reference to FIG 18. The vehicle 91 according to the embodiment of the present application includes a thermal management system 92 according to the above-described embodiment of the present application.

[0118] According to the vehicle 91 of the embodiment of the present application, by utilizing the thermal management system 92 according to the above-mentioned embodiment of the present application, the elastic member 44 is used to apply a force toward the valve port 131 to the valve needle 22, so that the valve needle 22 can fully block the valve port 131, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 131, thereby facilitating improving the qualification rate of the electronic expansion valve 1.

[0119] Other structures and operations of the vehicle 91 according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0121] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A valve needle assembly of an electronic expansion valve, wherein: include: A valve stem, wherein the valve stem is provided with a first stop surface and a second stop surface, wherein the first stop surface and the second stop surface are arranged at intervals in a moving direction of the valve stem; A valve needle, wherein the valve needle is provided with a stopper, at least a portion of the stopper is located between the first stopper surface and the second stopper surface, and the valve needle is movable relative to the valve stem so that the stopper switches between the first stopper surface and the second stopper surface to stop; An elastic member is respectively connected to the valve stem and the valve needle, and the elastic member applies a force toward the valve needle in a direction away from the valve stem.

2. The valve needle assembly of the electronic expansion valve according to claim 1, wherein: The end of the valve stem facing the valve needle includes a first part and a second part, the first part is located on the side of the second part facing the valve needle, the diameter of the first part is larger than the diameter of the second part, and the end surface of the first part exceeding the second part defines the first stop surface.

3. The valve needle assembly of the electronic expansion valve according to claim 2, wherein: The valve stem further comprises a guide block, which is sleeved onto the valve stem, and an end surface of the guide block facing the first stop surface defines the second stop surface.

4. The valve needle assembly of the electronic expansion valve according to claim 3, wherein: The guide sleeve and the valve stem are an integral part.

5. The valve needle assembly of the electronic expansion valve according to claim 3 or 4, wherein: The valve stem also includes a third part, which is connected to the second part. The diameter of the second part is larger than the diameter of the third part. The guide block is sleeved on the third part and stops at the second part.

6. The valve needle assembly of the electronic expansion valve according to claim 5, wherein: The valve stem also has a guide surface, which is located on a side of the third portion away from the second portion, and the guide surface extends obliquely toward the third portion to guide the installation of the guide block.

7. The valve needle assembly of the electronic expansion valve according to claim 6, wherein: In a direction from the valve stem to the valve needle, a cross-sectional diameter of the guide surface along the radial direction of the valve stem gradually increases.

8. The valve needle assembly of the electronic expansion valve according to any one of claims 1 to 7, wherein: The valve needle is provided with an accommodating cavity, and the elastic member is arranged in the accommodating cavity.

9. The valve needle assembly of the electronic expansion valve according to claim 8, wherein: The side wall of the accommodating cavity is provided with a communicating hole penetrating the side wall.

10. The valve needle assembly of the electronic expansion valve according to any one of claims 1 to 9, wherein: The moving distance of the stopper in the moving direction of the valve stem is between 0.1 mm and 0.3 mm.

11. An electronic expansion valve, wherein: include: A valve seat assembly, wherein the valve seat assembly is provided with a valve port; A valve needle assembly, wherein the valve needle assembly is a valve needle assembly of an electronic expansion valve according to any one of claims 1-10.

12. The electronic expansion valve according to claim 11, wherein: Also includes: A conversion member cooperates with the valve needle assembly to convert the rotation of the conversion member into a reciprocating movement of the valve needle assembly.

13. The electronic expansion valve according to claim 12, wherein: Also includes: A matching bearing is provided between the conversion member and the valve seat assembly.

14. A thermal management system, wherein: It comprises an electronic expansion valve according to any one of claims 11-13.

15. A vehicle, wherein: Comprising a thermal management system according to claim 14.

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