Electronic expansion valve, thermal management system, and vehicle

Abstract

An electronic expansion valve (1), comprising: a valve seat assembly (10), the valve seat assembly (10) being provided with a valve port (121); a valve needle assembly (20), the valve needle assembly (20) being reciprocatingly arranged on the valve seat assembly (10) to open or close the valve port (121); and a rotation stop assembly, the rotation stop assembly being arranged between the valve seat assembly (10) and the valve needle assembly (20), and the rotation stop assembly being used for limiting the rotation of at least the part of the valve needle assembly (20) matching the valve port (121). Also disclosed are a thermal management system comprising the electronic expansion valve, and a vehicle.

Description

Electronic expansion valve and thermal management system, vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 2023111333021 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 an electronic expansion valve, a thermal management system, and a vehicle. Background Art

[0004] 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, resulting in greater wear between the valve needle and the valve port.

[0005] Application Contents

[0006] The present application aims to address at least one of the technical problems existing in the prior art. To this end, the present application provides an electronic expansion valve that utilizes a rotation-stop assembly to restrict the rotation of a valve needle assembly, thereby reducing wear between the valve needle assembly and the valve seat assembly. This has the advantages of increasing the service life of the valve needle assembly and the valve seat assembly, and reducing noise generated within the electronic expansion valve.

[0007] The present application also provides a thermal management system and a vehicle having the electronic expansion valve.

[0008] According to the electronic expansion valve of the first aspect embodiment of the present application, it includes: a valve seat assembly, which is provided with a valve port; a valve needle assembly, which is reciprocatingly arranged on the valve seat assembly to open or close the valve port; and a stop assembly, which is arranged between the valve seat assembly and the valve needle assembly, and is used to limit the rotation of at least the part of the valve needle assembly that cooperates with the valve port.

[0009] According to the embodiment of the present application, the electronic expansion valve uses a stop assembly to limit the rotation of the valve needle assembly, thereby reducing the wear between the valve needle assembly and the valve seat assembly, and has the advantages of increasing the service life of the valve needle assembly and the valve seat assembly, and reducing the noise generated in the electronic expansion valve.

[0010] In addition, 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 anti-rotation assembly includes: a guide seat, which is arranged on the valve seat assembly; a guide sleeve, which is arranged on the valve needle assembly, and the guide sleeve is engaged with the guide seat to prevent rotation so as to limit the rotation of at least the part of the valve needle assembly that cooperates with the valve port.

[0012] According to some embodiments of the present application, the guide sleeve outer sleeve is fixed to the valve needle assembly.

[0013] According to some optional embodiments of the present application, the outer peripheral wall of the valve needle assembly is provided with a first step surface for supporting the guide sleeve.

[0014] According to some specific embodiments of the present application, a guide slope is provided on the outer peripheral wall of the valve needle assembly, and the guide slope extends obliquely toward the first step surface to guide the installation of the guide sleeve.

[0015] In some embodiments, the guide sleeve is located between the guide slope and the first step surface.

[0016] According to some embodiments of the present application, the guide seat and the valve seat assembly are an integral part; and / or the guide sleeve and the valve needle assembly are an integral part.

[0017] According to some embodiments of the present application, the outer peripheral wall of the guide sleeve along the radial cross-section of the valve needle assembly is formed into a non-circular shape, and the outer peripheral wall of the guide sleeve is suitable for cooperating with the guide seat to limit the rotational freedom of the guide sleeve.

[0018] According to some embodiments of the present application, a first stop portion is provided on a side of the cavity of the guide seat facing away from the valve port, and the first stop portion cooperates with the guide sleeve to limit the movement of the guide sleeve.

[0019] 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; and a mating bearing, which is arranged between the conversion member and the valve seat assembly.

[0020] In some embodiments, the valve seat assembly is provided with a receiving groove, the guide seat is provided in the receiving groove, and the guide seat is clamped between the first bottom wall of the receiving groove and the matching bearing.

[0021] In some examples, a first chamfer is provided between the first bottom wall and the first inner peripheral wall of the accommodating groove, and a second chamfer is provided between the placement end surface of the guide seat and the outer peripheral wall of the guide seat.

[0022] Furthermore, the placement end surface is supported on the first bottom wall, and the second chamfer and the first chamfer are spaced apart.

[0023] According to some optional embodiments of the present application, the valve seat assembly is provided with a first stopper, which contacts a side of the mating bearing facing away from the valve port to limit the axial displacement of the mating bearing.

[0024] According to some specific embodiments of the present application, the valve seat assembly includes a valve body, which is a metal part, and a portion of the metal part is bent inward to define the first stopper.

[0025] According to some optional embodiments of the present application, the mating bearing is provided with an inner ring assembly and an outer ring assembly that can rotate relative to each other, the conversion member is provided with a second stop portion and a third stop portion that are arranged axially at intervals, the inner ring assembly is arranged between the second stop portion and the third stop portion, the second stop portion is located on the side of the third stop portion facing the valve port, and the outer ring assembly is arranged on the valve seat assembly.

[0026] In some embodiments, an annular groove is provided on the outer peripheral wall of the conversion member, and an end surface of the annular groove facing the second stop portion defines the third stop portion.

[0027] According to some specific embodiments of the present application, the conversion member includes a first metal member, and a portion of the first metal member is bent outward to define the second stop portion.

[0028] According to some embodiments of the present application, the electronic expansion valve also includes a rotor component, and the conversion component includes a first part and a second part that are fixedly connected, the first part cooperates with the valve needle assembly to convert the rotation of the conversion component into reciprocating movement of the valve needle assembly; the second part cooperates with the rotor component to be driven to rotate by the rotor component.

[0029] According to some optional embodiments of the present application, the second portion is formed as a metal part, and the second portion is welded to the rotor component.

[0030] According to some optional embodiments of the present application, a mating part is provided in the valve seat assembly, and the electronic expansion valve also includes a rotating assembly, which cooperates with the valve needle assembly to convert the rotation of the rotating assembly into reciprocating movement of the valve needle assembly, and the rotating assembly cooperates with the mating part to radially limit the rotating assembly.

[0031] In some embodiments, the rotating component is plugged into and rotationally engaged with the mating piece.

[0032] According to some embodiments of the present application, the electronic expansion valve further includes a first elastic member, which cooperates with the valve needle assembly and the valve seat assembly respectively to apply an elastic force to the valve needle assembly to move toward the valve port.

[0033] According to some optional embodiments of the present application, the first elastic member is located on a side of the guide seat facing the valve port.

[0034] According to some optional embodiments of the present application, the valve needle assembly is provided with a matching groove, one end of the first elastic member extends into the matching groove, and the matching groove limits the radial displacement of the first elastic member.

[0035] According to some embodiments of the present application, the valve seat assembly includes: a valve seat; a flow channel seat, the flow channel seat being provided with at least one inlet; a valve sleeve, the valve sleeve being fixed between the valve seat and the flow channel seat, the valve sleeve being provided with the valve port, and the valve sleeve and the flow channel seat being interference fit in the radial direction.

[0036] According to some optional embodiments of the present application, the flow channel seat is provided with a matching protrusion, and a portion of the outer peripheral wall of the valve sleeve is interference fit with the matching protrusion.

[0037] In some embodiments, a sealing ring is further provided between the valve sleeve and the valve seat.

[0038] According to some embodiments of the present application, the valve needle assembly includes: a valve stem; a valve needle, which cooperates with the valve stem to be driven by the valve stem to move back and forth; and a second elastic member, which is respectively connected to the valve stem and the valve needle to apply a force to the valve needle to move toward the valve port when the valve needle assembly closes the valve port.

[0039] In some embodiments, the valve stem is provided with a first stop surface and a second stop surface, and the first stop surface and the second stop surface are spaced apart in the moving direction of the valve stem; the valve needle is provided with a second stop member, and at least a portion of the second stop member is located between the first stop surface and the second stop surface, and the valve needle is movable relative to the valve stem so that the second stop member switches to stop the first stop surface and the second stop surface.

[0040] In some embodiments, the anti-rotation assembly includes a guide seat and a guide sleeve, the guide seat is provided on the valve seat assembly, the guide sleeve is provided on the valve needle assembly, the guide sleeve and the guide seat are anti-rotatably cooperated to limit the rotation of at least the part of the valve needle assembly that cooperates with the valve port; the valve needle is provided with a second stop member, the guide sleeve is provided on the side of the second stop member away from the valve port, and the guide sleeve is suitable for abutting against the second stop member to limit the movement of the valve needle.

[0041] According to some optional embodiments of the present application, a first elastic member is further included, the valve seat is provided with a valve cavity connected to the valve port, the valve needle assembly moves back and forth in the valve cavity, and the first elastic member stops between the valve needle assembly and the inner wall of the valve cavity to apply an elastic force to the valve needle assembly toward the valve port.

[0042] According to some optional embodiments of the present application, the anti-rotation assembly is provided between the valve needle and the valve seat assembly.

[0043] According to an embodiment of a second aspect of the present application, a thermal management system is provided. The thermal management system includes the electronic expansion valve according to the embodiment of the first aspect of the present application.

[0044] 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 first aspect of the present application, the rotation of the valve needle assembly is restricted by using a stop assembly, thereby facilitating the reduction of wear between the valve needle assembly and the valve seat assembly, and having the advantages of increasing the service life of the valve needle assembly and the valve seat assembly, and reducing the noise generated in the electronic expansion valve.

[0045] According to an embodiment of a third aspect of the present application, a vehicle is provided, comprising the thermal management system according to the embodiment of the second aspect of the present application.

[0046] According to the vehicle of the embodiment of the present application, by utilizing the thermal management system described in the embodiment of the second aspect of the present application, the rotation of the valve needle assembly is restricted by the anti-rotation assembly, thereby reducing the wear between the valve needle assembly and the valve seat assembly, and having the advantages of increasing the service life of the valve needle assembly and the valve seat assembly, reducing the noise generated in the electronic expansion valve, etc.

[0047] 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

[0048] 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:

[0049] FIG1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present application;

[0050] FIG2 is a cross-sectional view of FIG1 at AA;

[0051] FIG3 is a schematic structural diagram of a valve seat assembly and a valve needle assembly according to an embodiment of the present application;

[0052] FIG4 is a schematic structural diagram of a valve seat assembly, a valve needle assembly, and a conversion member according to an embodiment of the present application;

[0053] 5 is a schematic structural diagram of a valve seat assembly, a valve needle assembly, a conversion member, and a rotor component according to an embodiment of the present application;

[0054] FIG6 is an enlarged view of point B in FIG5 ;

[0055] 7 is a schematic structural diagram of a valve seat assembly, a valve needle assembly, a conversion member, a rotor member, and a matching member according to an embodiment of the present application;

[0056] FIG8 is a schematic structural diagram of a valve needle assembly according to an embodiment of the present application;

[0057] FIG9 is a cross-sectional view of FIG8;

[0058] FIG10 is a schematic structural diagram of a valve needle assembly and a guide sleeve according to an embodiment of the present application;

[0059] FIG11 is a cross-sectional view of FIG10;

[0060] FIG12 is a partial structural schematic diagram of a valve needle assembly according to an embodiment of the present application;

[0061] FIG13 is a schematic structural diagram of a guide sleeve according to an embodiment of the present application;

[0062] FIG14 is a schematic structural diagram of a guide seat according to an embodiment of the present application;

[0063] FIG15 is a cross-sectional view of FIG14;

[0064] FIG16 is a schematic structural diagram of a conversion member according to an embodiment of the present application;

[0065] FIG17 is a cross-sectional view of FIG16;

[0066] FIG18 is a schematic structural diagram of a valve seat according to an embodiment of the present application;

[0067] FIG19 is a cross-sectional view of FIG18;

[0068] FIG20 is a schematic structural diagram of a rotor component according to an embodiment of the present application;

[0069] FIG21 is a cross-sectional view of FIG20;

[0070] FIG22 is a schematic structural diagram of a matching piece in one direction according to an embodiment of the present application;

[0071] FIG23 is a schematic structural diagram of a matching piece according to an embodiment of the present application in another direction;

[0072] FIG24 is a schematic structural diagram of a valve seat and a flow channel seat according to an embodiment of the present application;

[0073] Figure 25 is a front view of Figure 24;

[0074] FIG26 is a cross-sectional view of a portion CC in FIG25;

[0075] FIG27 is an enlarged view of point D in FIG26;

[0076] FIG28 is a schematic structural diagram of a valve seat according to an embodiment of the present application;

[0077] FIG29 is a cross-sectional view of a valve seat according to an embodiment of the present application;

[0078] FIG30 is a schematic structural diagram of a flow channel seat according to an embodiment of the present application;

[0079] FIG31 is a cross-sectional view of a flow channel seat according to an embodiment of the present application;

[0080] FIG32 is a schematic structural diagram of a valve sleeve according to an embodiment of the present application;

[0081] FIG33 is a cross-sectional view of a valve sleeve according to an embodiment of the present application;

[0082] Figure 34 is a structural diagram of a vehicle and thermal management system according to an embodiment of the present application.

[0083] Reference numerals: electronic expansion valve 1,

[0084] Valve seat assembly 10, fluid space 101,

[0085] Valve body 11, first stopper 111, valve chamber 116,

[0086] Valve seat 12, valve port 121, groove 122, second protrusion 123, first cavity 124, receiving groove 125, first bottom wall 126, first inner peripheral wall 127, first chamfer 128,

[0087] The flow channel seat 13, the inlet 131, the matching protrusion 132, the second cavity 133,

[0088] Valve sleeve 14, first protrusion 141, step portion 143, matching slope 144, sealing ring 15,

[0089] Matching piece 16, matching cavity 161, sleeve 17, first chamber 181, second chamber 182, coil assembly 19,

[0090] Valve needle assembly 20, valve stem 21, guide inclined surface 211, first step surface 212, first cylindrical portion 213, first stop surface 215, second stop surface 216, valve needle 22, matching groove 221, second stop member 222, balancing hole 23, first matching surface 231, second matching surface 232, second elastic member 24,

[0091] Guide seat 30, cavity 31, first stopper 311, placement end face 33, second chamfer 34, guide sleeve 41, matching bearing 42, inner ring assembly 421, outer ring assembly 422, first elastic member 43,

[0092] Converter 50, first part 501, second part 502, first metal part 51, second stopper 511, annular groove 512, third stopper 515,

[0093] Rotor component 60 , connection portion 61 , vehicle 91 , thermal management system 92 . DETAILED DESCRIPTION

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] The electronic expansion valve 1 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0100] As shown in FIG. 2 and FIG. 4 , the electronic expansion valve 1 according to an embodiment of the present application includes a valve seat assembly 10 , a valve needle assembly 20 and a rotation-stop assembly.

[0101] The valve seat assembly 10 is provided with a valve port 121, and the valve needle assembly 20 can be reciprocally arranged on the valve seat assembly 10 to open or close the valve port 121. The anti-rotation assembly is arranged between the valve seat assembly 10 and the valve needle assembly 20. The anti-rotation assembly is used to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121, so that when the valve needle assembly 20 opens or closes the valve port 121, the part of the valve needle assembly 20 that cooperates with the valve port 121 only moves relative to the valve seat assembly 10 and does not rotate, thereby reducing the wear of the part of the valve needle assembly 20 that cooperates with the valve port 121, facilitating the improvement of the service life of the valve needle assembly 20, improving the service life of the electronic expansion valve 1, and reducing the noise generated in the electronic expansion valve 1.

[0102] Specifically, when the valve needle assembly 20 moves back and forth in the valve seat assembly 10 to open or close the valve port 121, when the part of the valve needle assembly 20 that cooperates with the valve port 121 has a tendency to rotate, the anti-rotation assembly can limit the rotation of this part of the valve needle assembly 20, so that the part of the valve needle assembly 20 that cooperates with the valve port 121 can only move back and forth in the valve seat assembly 10 and cannot rotate, so as to reduce the wear on the part of the valve needle assembly 20 that cooperates with the valve port 121 when the valve needle assembly 20 moves back and forth to open or close the valve port 121.

[0103] Therefore, according to the embodiment of the present application, the electronic expansion valve 1 uses a stop assembly to limit the rotation of the valve needle assembly 20, so as to reduce the wear between the valve needle assembly 20 and the valve seat assembly 10, and has the advantages of increasing the service life of the valve needle assembly 20 and the valve seat assembly 10, and reducing the noise generated in the electronic expansion valve 1.

[0104] The electronic expansion valve 1 according to a specific embodiment of the present application is described below with reference to the accompanying drawings.

[0105] As shown in FIG. 2 and FIG. 4 , the electronic expansion valve 1 according to an embodiment of the present application includes a valve seat assembly 10 , a valve needle assembly 20 and a rotation-stop assembly.

[0106] In some embodiments of the present application, the valve needle assembly 20 includes a valve stem 21 and a valve needle 22 . The valve needle 22 cooperates with the valve stem 21 to be driven by the valve stem 21 to move back and forth. The valve needle 22 is used to open or close the valve port 121 .

[0107] In some embodiments, a stop assembly is provided between the valve seat assembly 10 and the valve stem 21 to limit the rotational freedom of the valve stem 21 so that the valve stem 21 can only move back and forth within the valve seat assembly 10 but cannot rotate, thereby causing the valve stem 21 to only drive the valve needle 22 to move back and forth but not to rotate, thereby reducing the wear between the valve needle 22 and the valve port 121 when the valve needle 22 opens or closes the valve port 121.

[0108] In other embodiments, the anti-rotation assembly is arranged between the valve seat assembly 10 and the valve needle 22. Even if the valve stem 21 rotates, the valve needle 22 will only move within the valve seat assembly 10 and will not rotate due to the restriction of the anti-rotation assembly, so as to reduce the wear between the valve needle 22 and the valve port 121 when the valve needle 22 opens or closes the valve port 121.

[0109] In some embodiments of the present application, as shown in Figures 5 and 6, the anti-rotation assembly includes a guide seat 30 and a guide sleeve 41. The guide seat 30 is arranged on the valve seat assembly 10, and the guide sleeve 41 is arranged on the valve needle assembly 20. The guide sleeve 41 and the guide seat 30 are anti-rotationally matched to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121. When the valve needle assembly 20 moves back and forth, under the restriction of the guide seat 30, the guide sleeve 41 and the part of the valve needle assembly 20 that cooperates with the valve port 121 can only move in the valve seat assembly 10 but cannot rotate, so that when the valve needle assembly 20 opens or closes the valve port 121, the friction between the part of the valve needle assembly 20 that cooperates with the valve port 121 and the valve seat assembly 10 can be reduced, thereby facilitating the reduction of noise generated in the electronic expansion valve 1, reducing the degree of mutual wear between the valve needle assembly 20 and the valve seat assembly 10, and facilitating the improvement of the service life of the valve needle assembly 20 and the service life of the electronic expansion valve 1.

[0110] Specifically, when the part of the valve needle assembly 20 that cooperates with the valve port 121 moves back and forth in the valve seat assembly 10 to open or close the valve port 121, when the part of the valve needle assembly 20 that cooperates with the valve port 121 has a tendency to rotate, the cooperation of the guide seat 30 and the guide sleeve 41 can limit the rotation of the part of the valve needle assembly 20 that cooperates with the valve port 121, so that the part of the valve needle assembly 20 that cooperates with the valve port 121 can only move back and forth in the valve seat assembly 10 and cannot rotate, so as to reduce the wear of the part of the valve needle assembly 20 that cooperates with the valve port 121 when the part of the valve needle assembly 20 that cooperates with the valve port 121 moves back and forth to open or close the valve port 121.

[0111] In other embodiments of the present application, as shown in Figures 4 and 10, the guide sleeve 41 is fixed to the outer sleeve of the valve needle assembly 20, and the guide sleeve 41 cooperates with the guide seat 30 provided on the valve seat assembly 10. When the part of the valve needle assembly 20 that cooperates with the valve port 121 has a rotation tendency, the guide sleeve 41 also has a rotation tendency. At this time, the guide seat 30 can limit the rotation of the guide sleeve 41, and then limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121, so that at least the part of the valve needle assembly 20 that cooperates with the valve port 121 and the guide sleeve 41 can only move back and forth but cannot rotate.

[0112] Among them, a guide sleeve 41 is provided separately and installed on the valve needle assembly 20. The cooperation between the guide sleeve 41 and the guide seat 30 is used to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121, so as to reduce the complexity of the structure of the valve needle assembly 20 and reduce the manufacturing cost of the valve needle assembly 20.

[0113] In some optional embodiments of the present application, as shown in Figures 11 and 12, the outer peripheral wall of the valve needle assembly 20 is provided with a first step surface 212, and the first step surface 212 is used to support the guide sleeve 41 to limit the position of the guide sleeve 41 to prevent the guide sleeve 41 from falling off the valve needle assembly 20.

[0114] In some specific embodiments of the present application, as shown in Figures 11 and 12, the outer peripheral wall of the valve needle assembly 20 is provided with a guide slope 211, and the guide slope 211 extends obliquely toward the first step surface 212 for guiding the installation of the guide sleeve 41, so that the guide sleeve 41 can be smoothly put onto the valve needle assembly 20, and then when the valve needle assembly 20 moves back and forth, the valve needle assembly 20 can drive the guide sleeve 41 to move back and forth, avoiding the valve needle assembly 20 from being disengaged from the guide sleeve 41 when the valve needle assembly 20 moves back and forth, and then utilizing the cooperation of the guide sleeve 41 and the guide seat 30 to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0115] In some embodiments, the guide sleeve 41 is located between the guide slope 211 and the first step surface 212 to limit the position of the guide sleeve 41 on the valve needle assembly 20. When the valve needle assembly 20 moves back and forth, the valve needle assembly 20 can drive the guide sleeve 41 to move back and forth, thereby preventing the valve needle assembly 20 from being disengaged from the guide sleeve 41 when the valve needle assembly 20 moves back and forth, and then utilizing the cooperation of the guide sleeve 41 and the guide seat 30 to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0116] In some embodiments, as shown in FIG12 , the valve needle assembly 20 has a first cylindrical portion 213, which is located between the guide slope 211 and the first stepped surface 212. The guide sleeve 41 is externally mounted on the first cylindrical portion 213, with an interference fit between the guide sleeve 41 and the first cylindrical portion 213. When the guide sleeve 41 is externally mounted on the valve needle assembly 20, the guide slope 211 can guide the installation of the guide sleeve 41, so that the guide sleeve 41 is smoothly mounted on the first cylindrical portion 213, and the guide sleeve 41 and the first cylindrical portion 213 are smoothly mated.

[0117] After the guide sleeve 41 is sleeved on the first cylindrical portion 213 , one end of the guide sleeve 41 is engaged with the first step surface 212 to limit the position of the guide sleeve 41 on the valve needle assembly 20 , so that the guide sleeve 41 can be smoothly sleeved on the valve needle assembly 20 .

[0118] In some optional embodiments of the present application, the guide seat 30 and the valve seat assembly 10 are integrated, which makes it easier to reduce the installation steps of fixing the guide seat 30 to the valve seat assembly 10, and utilizes the cooperation of the guide seat 30 and the guide sleeve 41 to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0119] In some optional embodiments of the present application, the guide sleeve 41 and the valve needle assembly 20 are integrated, which reduces the installation steps of fixing the guide sleeve 41 to the valve needle assembly 20, and utilizes the cooperation of the guide seat 30 and the guide sleeve 41 to limit the rotation of the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0120] In some embodiments of the present application, as shown in Figures 13 and 14, the outer peripheral wall of the guide sleeve 41 along the radial cross-section of the valve needle assembly 20 is formed into a non-circular shape, and the outer peripheral wall of the guide sleeve 41 is suitable for cooperating with the guide seat 30 to limit the rotational freedom of the guide sleeve 41, so that when the guide sleeve 41 has a rotation tendency, the guide seat 30 has a stopping force on the outer peripheral wall of the guide sleeve 41 to limit the rotation of the guide sleeve 41, thereby limiting the rotation of the valve needle assembly 20, so that the valve needle assembly 20 can only move back and forth in the valve seat assembly 10 without rotating, so that when the valve needle assembly 20 opens or closes the valve port 121, the wear between the valve needle assembly 20 and the valve seat assembly 10 can be reduced.

[0121] In some embodiments, the guide seat 30 has a cavity 31, and the cross-sectional area of ​​the cavity 31 is a non-circular shape that is adapted to the outer peripheral wall of the guide sleeve 41. When the guide sleeve 41 has a tendency to rotate, the inner wall of the cavity 31 has a stopping force on the outer peripheral wall of the guide sleeve 41 to limit the rotation of the guide sleeve 41, so that the guide sleeve 41 can only move back and forth in the cavity 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 121, 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.

[0122] In some examples, the inner wall of the cavity 31 slides with the outer wall of the guide sleeve 41. When the valve needle assembly 20 moves back and forth, the inner wall of the cavity 31 can guide the moving direction of the guide sleeve 41, so that the guide sleeve 41 can move back and forth smoothly in the cavity 31, so that the valve needle assembly 20 can smoothly open or close the valve port 121.

[0123] In some examples, the outer peripheral wall of the guide sleeve 41 can be formed into a triangle, square, hexagon, etc., and at least a portion of the inner wall of the cavity 31 in the guide seat 30 is correspondingly formed into a triangle, square, hexagon, etc. to cooperate with the guide sleeve 41 to prevent rotation.

[0124] In other examples, the outer peripheral wall of the guide sleeve 41 is provided with one of a guide groove and a guide protrusion, and the inner wall of the 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 movement direction of the guide sleeve 41 can be guided by the cooperation of the guide protrusion and the guide groove. At the same time, when the guide sleeve 41 has a rotation tendency, the rotation of the guide sleeve 41 is restricted by the cooperation of the guide protrusion and the guide groove, thereby restricting the rotation of the valve needle assembly 20.

[0125] For example, the outer wall of the guide sleeve 41 is provided with a guide groove, and the inner wall of the 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 sleeve 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 121.

[0126] 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 sleeve 41, so that the guide sleeve 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 121, 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.

[0127] In some embodiments of the present application, as shown in Figure 15, a first stop portion 311 is provided on the side of the cavity 31 of the guide seat 30 that is away from the valve port 121. The first stop portion 311 is suitable for cooperating with the guide sleeve 41 to limit the movement displacement of the guide sleeve 41. By limiting the range of movement displacement of the guide sleeve 41, the range of movement displacement of the valve needle assembly 20 can be limited to control the degree to which the valve needle assembly 20 fully opens the valve port 121.

[0128] Specifically, when the valve needle assembly 20 moves away from the valve port 121 to open the valve port 121 , the valve needle assembly 20 stops moving when the guide sleeve 41 cooperates with the first stop portion 311 . At this time, the valve needle assembly 20 fully opens the valve port 121 .

[0129] In addition, since the guide seat 30 is fixed in the valve seat assembly 10, the guide seat 30 is fixed and does not move. The guide seat 30 cooperates with the guide sleeve 41 to limit the rotational freedom of the guide sleeve, so that the guide sleeve 41 can only move in the cavity 31 and does not rotate. In this way, when the valve needle assembly 20 moves to open the valve port 121, only relative movement and no relative rotation occur between the first stop portion 311 and the guide sleeve 41. In this way, when the first stop portion 311 cooperates with the guide sleeve 41, the friction between the first stop portion 311 and the guide sleeve 41 is small and no rotational friction is generated, which facilitates reducing the noise generated in the electronic expansion valve 1.

[0130] In some embodiments, as shown in FIG14 , 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 cavity 31 , which extends in the up-down direction. In the radial direction of the cavity 31 , 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 cavity 30 , thereby reducing the possibility of deformation of the peripheral wall of the guide seat 30 when the guide seat 30 is injection molded.

[0131] In some embodiments of the present application, as shown in Figure 4, the electronic expansion valve 1 also includes a conversion member 50 and a matching bearing 42. The conversion member 50 cooperates with the valve needle assembly 20 to convert the rotation of the conversion member 50 into the reciprocating movement of the valve needle assembly 20. The matching bearing 42 is arranged between the conversion member 50 and the valve seat assembly 10. The matching 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 reciprocate, and so that the valve needle assembly 20 can smoothly open or close the valve port 121.

[0132] In some embodiments, as shown in Figure 4, the conversion member 50 is threadedly engaged with the valve needle assembly 20. Since the guide sleeve 41 is engaged with the guide seat 30, the guide seat 30 can limit the rotation of the guide sleeve 41, and thereby limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121, so that when the conversion member 50 rotates, the conversion member 50 can drive the part of the valve needle assembly 20 that cooperates with the valve port 121 to move back and forth without driving the valve needle assembly 20 to rotate, so that the part of the valve needle assembly 20 that cooperates with the valve port 121 can smoothly open or close the valve port 121.

[0133] 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.

[0134] In some optional embodiments of the present application, the valve seat assembly 10 is provided with a receiving groove 125, and the guide seat 30 is provided in the receiving groove 125. The guide seat 30 is clamped between the first bottom wall 126 of the receiving groove 125 and the mating bearing 42. In this way, after the mating bearing 42 is fixed on the valve seat assembly 10, the mating bearing 42 has a force on the guide seat 30 toward the bottom wall of the receiving groove 125, thereby being able to limit the position of the guide seat 30. The guide seat 30 is fixed in the receiving groove 125, so that the guide seat 30 can limit the rotational freedom of the guide sleeve 41, thereby limiting the rotational freedom of at least the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0135] In some specific embodiments of the present application, as shown in Figures 15 and 19, a first chamfer 128 is provided between the first bottom wall 126 and the first inner peripheral wall 127 of the accommodating groove 125, and a second chamfer 34 is provided between the placement end face 33 and the outer peripheral wall of the guide seat 30. By providing the first chamfer 128 between the first bottom wall 126 and the first inner peripheral wall 127 of the accommodating groove 125, it is convenient to increase the wall thickness of the valve seat assembly 10 corresponding to the first chamfer 128, thereby facilitating the increase of the structural strength of the valve seat assembly 10. The guide seat 30 is provided with the second chamfer 34 so that when the guide seat 30 is placed in the accommodating groove 125, the first chamfer 128 can avoid the second chamfer 34, thereby avoiding interference between the first chamfer 128 and the second chamfer 34.

[0136] In some embodiments, the placement end surface 33 is supported on the first bottom wall 126, and the second chamfer 34 and the first chamfer 128 are spaced apart so that the guide seat 30 can be smoothly placed in the accommodating groove 125, so that the placement end surface 33 of the guide seat 30 can fit with the first bottom wall 126, and then the guide seat 30 can be stably placed in the accommodating groove 125, so that the guide seat 30 can limit the rotational freedom of at least the part of the valve needle assembly 20 that cooperates with the valve port 121.

[0137] In some examples, as shown in Figures 15 and 19, both the first chamfer 128 and the second chamfer 34 are oblique chamfers, with the first chamfer 128 and the second chamfer 34 being chamfered at 45 degrees, and the right-angled side of the second chamfer 34 being larger than the right-angled side of the first chamfer 128. This allows the first chamfer 128 and the second chamfer 34 to be spaced apart when the guide seat 30 is placed in the receiving groove 122, allowing the first chamfer 128 to avoid the second chamfer 34, thus preventing interference between the first chamfer 128 and the second chamfer 34. This allows the guide seat 30 to be stably positioned in the receiving groove 122, allowing the guide seat 30 to limit the rotational freedom of the valve needle assembly 20. It is understood that the first chamfer 128 and the second chamfer 34 may also be rounded or other forms.

[0138] In some optional embodiments of the present application, the valve seat assembly 10 is provided with a first stop member 111, which contacts the side of the mating bearing 42 facing away from the valve port 121 to limit the axial displacement of the mating bearing 42, thereby limiting the position of the mating bearing 42, so that the mating bearing 42 can support the position of the conversion member 50, so that the conversion member 50 can rotate smoothly, and when the conversion member 50 rotates, it can drive the valve needle assembly 20 to move smoothly, so that the valve needle assembly 20 can open or close the valve port 121.

[0139] In some specific embodiments of the present application, as shown in Figures 5 and 6, the valve seat assembly 10 includes a valve body 11, which is a metal part. A portion of the metal part is bent inward to define a first stopper 111. This arrangement facilitates the installation of the mating bearing 42 on the valve body 11. Specifically, after the mating bearing 42 is installed on the valve body 11, a portion of the metal part is bent so that the first stopper 111 is in contact with the side of the mating bearing 42 facing away from the valve port 121.

[0140] In some embodiments, a portion of the metal part is bent inward to define multiple first stoppers 111, which increases the area of ​​the metal part mating with the mating bearing 42, and utilizes multiple first stoppers 111 to more reliably limit the axial displacement of the mating bearing 42.

[0141] In some embodiments, as shown in Figures 6 and 19, the valve body 11 defines a receiving groove 125, the first stopper 111 is abutted against the upper end of the outer ring component 422 of the mating bearing 42, the mating bearing 42 is sleeved on the conversion component 50, and the inner ring component 421 of the mating bearing 42 is fixedly matched with the conversion component 50. After the mating bearing 42 and the conversion component 50 are fixed together, the mating bearing 42 is first installed in the receiving groove 125, and then a part of the metal part is bent so that the first stopper 111 contacts and fits with the upper end of the outer ring component 422 of the mating bearing 42, so as to limit the position of the mating bearing 42 on the valve body 11 and limit the upward movement of the mating bearing 42, thereby limiting the position of the mating bearing 42 in the receiving groove 125 along the up and down directions (the up and down directions are shown in Figure 5. It should be noted 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 valve seat assembly 10 of the electronic expansion valve 1).

[0142] In other specific embodiments of the present application, the first stop member 111 is fixed to the valve seat assembly 10. After determining the position of the mating bearing 42 on the valve seat assembly 10, the first stop member 111 is installed and fixed to the valve seat assembly 10, so that the first stop member 111 is in contact with the side of the mating bearing 42 facing away from the valve port 121, and the first stop member 111 is used to limit the axial displacement of the mating bearing 42.

[0143] Among them, the first stop member 111 can be a stop plate, which is fixed to the side wall of the accommodating groove 125. The stop plate is located above the mating bearing 42 and is abutted against the upper end of the outer ring assembly 422 of the mating bearing 42 to limit the movement of the mating bearing 42 in the up and down directions.

[0144] In some optional embodiments of the present application, as shown in Figures 6 and 17, the matching bearing 42 is provided with an inner ring assembly 421 and an outer ring assembly 422 that can rotate relative to each other, and the conversion member 50 is provided with a second stop portion 511 and a third stop portion 515. The second stop portion 511 and the third stop portion 515 are arranged at intervals along the axial direction of the conversion member 50, and the second stop portion 511 is located on the side of the third stop portion 515 facing the valve port 121. The inner ring assembly 421 is clamped between the third stop portion 515 and the second stop portion 511. The outer ring assembly 422 is provided on the valve seat assembly 10 to fix the inner ring assembly 421 on the conversion member 50 to achieve the matching between the conversion member 50 and the matching bearing 42. When the conversion member 50 rotates, the inner ring assembly 421 rotates with the conversion member 50 and the outer ring assembly 422 is positioned and installed in the valve seat assembly 10. Therefore, the matching bearing 42 can support the conversion member 50 so that the conversion member 50 can rotate smoothly in the valve seat assembly 10.

[0145] Specifically, when the conversion member 50 rotates, the conversion member 50 drives the valve needle assembly 20 to move back and forth. Since the outer ring assembly 422 of the matching bearing 42 is arranged on the valve seat assembly 10, the inner ring assembly 421 rotates with the conversion member 50. Therefore, the matching bearing 42 can support the conversion member 50 while also limiting the position of the conversion member 50, so that the conversion member 50 can rotate smoothly but will not move back and forth with the valve needle assembly 20, thereby enabling the conversion member 50 to smoothly drive the valve needle assembly 20 to move back and forth, so that the valve needle assembly 20 can smoothly open or close the valve port 121.

[0146] In some optional embodiments of the present application, as shown in Figure 17, the outer peripheral wall of the conversion member 50 is provided with an annular groove 512, and the inner wall of the annular groove 512, which is arranged opposite to the second stop portion 511, defines a third stop portion 515. The inner ring assembly 421 is arranged on the annular groove 512 and one end is supported by the second stop portion 511, and the other end is stopped by the third stop portion 515, so as to achieve a fixed fit between the inner ring assembly 421 and the conversion member 50, so that the mating bearing 42 can support the conversion member 50, so that the conversion member 50 can rotate smoothly and stably.

[0147] In some specific embodiments of the present application, as shown in Figure 17, the conversion member 50 includes a first metal member 51, and a portion of the first metal member 51 is bent outward to define a second stop portion 511. This arrangement facilitates the installation of the mating bearing 42 on the conversion member 50. Specifically, after the mating bearing 42 is sleeved onto the conversion member 50 from the end of the first metal member 51, the end of the first metal member 51 is bent outward so that the second stop portion 511 is in contact with and fits with the side of the mating bearing 42 facing the valve port 121.

[0148] Among them, a portion of the first metal part 51 is bent outward to define a second stop portion 511. This arrangement facilitates the installation of the matching bearing 42 on the conversion part 50. Specifically, after the matching bearing 42 is inserted from the end of the conversion part 50 into the annular groove 512, a portion of the first metal part 51 is bent so that the second stop portion 511 contacts and cooperates with the inner ring assembly 421 to achieve a matching connection between the matching bearing 42 and the conversion part 50, thereby avoiding interference of the second stop portion 511 with the installation of the matching bearing 42.

[0149] As shown in Figure 17, in this embodiment, the second stop portion 511 forms the lower side wall of the annular groove 512, and the upper side wall of the annular groove 512 forms the third stop portion 515. The third stop portion 515 is arranged opposite to the second stop portion 511. When the mating bearing 42 is inserted into the annular groove 512 from the end of the conversion member 50, the upper end of the inner ring assembly 421 is abutted and engaged with the third stop portion 515. Then, a part of the conversion member 50 is bent so that the second stop portion 511 contacts and engages with the inner ring assembly 421 to achieve fixed engagement between the inner ring assembly 421 and the conversion member 50. Since the outer ring assembly 422 is positioned and mounted in the valve seat assembly 10, when the conversion member 50 rotates, the conversion member 50 drives the inner ring assembly 421 to rotate. The outer ring assembly 422 supports the conversion member 50 through the inner ring assembly 421, so that the conversion member 50 can rotate smoothly and stably in the valve seat assembly 10.

[0150] Among them, the matching bearing 42 is sleeved onto the conversion part 50 from the lower end of the conversion part 50. After the upper end of the inner ring component 421 of the matching bearing 42 is abutted and engaged with the third stop part 515, the lower end of the first metal part 51 is bent to make the third stop part 515 abut and engage with the lower end of the inner ring component 421 of the conversion part 50, so as to install the matching bearing 42 on the conversion part 50. When the conversion part 50 rotates, the conversion part 50 will drive the inner ring component 421 of the matching bearing 42 to rotate.

[0151] In some examples, as shown in Figures 5 and 19, the valve body 11 defines a receiving groove 125, the guide seat 30 and the mating bearing 42 are arranged in the receiving groove 125, the mating bearing 42 is arranged on the side of the guide seat 30 away from the valve port 121, and the mating bearing 42 is sleeved on the conversion member 50. When the mating bearing 42 is set in the receiving groove 125, when the lower end of the outer ring component 422 of the mating bearing 42 is stopped and engaged with the upper end of the guide sleeve 41, a part of the valve body 11 is bent so that the first stop member 111 is stopped and engaged with the upper end of the outer ring component 422 of the mating bearing 42. At this time, the guide seat 30 and the first stop member 111 limit the position of the mating bearing 42 in the up and down directions to prevent the mating bearing 42 from moving in the up and down directions, thereby enabling the mating bearing 42 to stably support the rotation of the conversion member 50.

[0152] Among them, when the lower end of the outer ring component 422 of the matching bearing 42 is stopped and matched with the upper end of the guide seat 30, the outer ring component 422 of the matching bearing 42 has a downward extrusion force on the guide seat 30, so that the lower end of the guide seat 30 is matched with the bottom wall of the accommodating groove 125, thereby limiting the position of the guide seat 30 in the accommodating groove 125, so as to fix the guide seat 30 in the accommodating groove 125, prevent the guide seat 30 from rotating in the accommodating groove 125, and enable the guide seat 30 to limit the rotation of the guide sleeve 41.

[0153] In some optional embodiments of the present application, as shown in Figures 4 and 17, the electronic expansion valve 1 also includes a rotor component 60, and the conversion member 50 includes a first part 501 and a second part 502 that are fixedly connected. The first part 501 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, and the second part 502 cooperates with the rotor component 60 to be driven to rotate by the rotor component 60. This makes it convenient to form the first part 501 and the second part 502 into different materials according to needs, so that the first part 501 can smoothly cooperate with the valve needle assembly 20, and the second part 502 can smoothly cooperate with the rotor component 60.

[0154] In some optional embodiments of the present application, the first part 501 is formed as a resin part, and the first part 501 is threadedly engaged with the valve needle assembly 20, which makes it easy to reduce the weight of the conversion part 50. At the same time, the resin part can lubricate the internal and external threads to ensure that the first part 501 can smoothly drive the valve needle assembly 20 to move back and forth.

[0155] In some optional embodiments of the present application, the second part 502 is formed as a metal part, and the second part 502 is welded to the rotor part 60 to fix the rotor part 60 and the conversion part 50 together, so that when the rotor part 60 rotates, the conversion part 50 can be smoothly driven to rotate, so that the conversion part 50 can drive the valve needle assembly 20 to move back and forth.

[0156] In some embodiments, as shown in Figure 2, the electronic expansion valve 1 also includes a coil assembly 19, which is coupled to the rotor component 60. After the coil assembly 19 is energized, it can drive the rotor component 60 to rotate. The rotor component 60 drives the conversion member 50 to rotate through the second part 502. When the conversion member 50 rotates, the conversion member 50 can drive the valve needle assembly 20 to move back and forth, so that the valve needle assembly 20 can open or close the valve port 121.

[0157] In some optional embodiments of the present application, as shown in Figure 7, a fitting 16 is provided in the valve seat assembly 10, and the electronic expansion valve 1 also includes a rotating assembly, which cooperates with the valve needle assembly 20 to convert the rotation of the rotating assembly into reciprocating movement of the valve needle assembly 20. The rotating assembly cooperates with the fitting 16 to radially limit the rotating assembly, thereby facilitating the reduction of radial shaking of the rotating assembly. Specifically, the fitting 16 can be used to support the rotating assembly, which facilitates reducing the amplitude of radial shaking of the rotating assembly, so that the rotating assembly can rotate smoothly, and the rotating assembly can smoothly drive the valve needle assembly 20 to move back and forth.

[0158] Specifically, since the rotating assembly has a certain length, when the rotating assembly rotates, the rotating assembly is prone to rocking along its radial direction, so that the rotating assembly cooperates with the mating part 16, and the mating part 16 is used to support the rotation of the rotating assembly. Therefore, when the rotating assembly rotates, the amplitude of the rocking of the rotating assembly can be reduced, which is convenient for improving the smoothness of the rotation of the rotating assembly and reducing the possibility of collision between the rotating assembly and the valve seat assembly 10.

[0159] In some optional embodiments of the present application, the rotating assembly is plugged into and rotationally matched with the mating piece 16, so that when the rotating assembly rotates, on the one hand, the mating piece 16 can support the rotating assembly so that the rotating assembly can rotate stably, and on the other hand, the mating piece 16 will not interfere with the rotation of the rotating assembly, so that the rotating assembly can smoothly drive the valve needle assembly 20 to move back and forth.

[0160] In some embodiments, the rotating assembly includes a conversion member 50 and a rotor assembly 60. The rotor assembly 60 cooperates with the conversion member 50 to drive the conversion member 50 to rotate. The conversion member 50 cooperates with the valve needle assembly 20 to convert the rotation of the conversion member 50 into the reciprocating movement of the valve needle assembly 20, thereby enabling the valve needle assembly 20 to move back and forth in the valve seat assembly to open or close the valve port 121.

[0161] In some embodiments, the rotor assembly 60 cooperates with the fitting 16 and rotates together. The fitting 16 can radially limit the rotor assembly 60 so that when the rotor assembly 60 rotates, the radial shaking amplitude of the rotor assembly 60 can be reduced, thereby ensuring the stable rotation of the rotor assembly 60 and reducing the possibility of collision between the rotor assembly 60 and the valve seat assembly 10.

[0162] In other embodiments, the conversion member 50 is engaged and rotationally engaged with the fitting member 16. In still other embodiments, both the conversion member 50 and the rotor assembly 60 are engaged and rotationally engaged with the fitting member 16.

[0163] In some embodiments, as shown in Figure 2, the valve seat assembly 10 includes a valve body 11 and a sleeve 17. The sleeve 17 is fixed to the valve body 11. The sleeve 17 and the valve body 11 jointly define an installation cavity. The rotor assembly is rotatably disposed in the installation cavity. The mating piece 16 is disposed in the sleeve 17 and rotatably cooperates with the rotor assembly.

[0164] As shown in Figures 7 and 23, in some embodiments, the conversion member 50 cooperates with the mating member 16 and rotates together. The mating member 16 defines a mating cavity 161, and the end of the second part 502 of the conversion member 50 extends into the mating cavity 161. When the conversion member 50 rotates, the side wall of the mating cavity 161 limits the rotation of the second part 502 to reduce the shaking amplitude of the end of the conversion member 50 when the conversion member 50 rotates.

[0165] Specifically, if the length of the conversion member 50 is long, when the conversion member 50 rotates, the end of the conversion member 50 will swing to a greater extent, so that the end of the second part 502 is plugged and rotated with the matching member 16 to guide the rotation direction of the second part 502, thereby reducing the swing amplitude of the end of the conversion member 50 and improving the smoothness of the rotation of the conversion member 50.

[0166] As shown in Figure 21, in this embodiment, the rotor component 60 includes a connecting portion 61, which is used to be welded to the second portion 502 to fix the rotor component 60 and the conversion component 50 together, so that when the rotor component 60 rotates, the conversion component 50 can be smoothly driven to rotate, so that the conversion component 50 can drive the valve needle assembly 20 to move back and forth.

[0167] The fitting member 16 can restrict the conversion member 50 , thereby reducing the swing amplitude of the conversion member 50 and the swing amplitude of the rotor member 60 , thereby reducing the possibility of the rotor member 60 colliding with the valve seat assembly 10 during rotation.

[0168] In some embodiments of the present application, as shown in Figure 2, the electronic expansion valve 1 also includes a first elastic member 43, which cooperates with the valve needle assembly 20 and the valve seat assembly 10 respectively to apply an elastic force to the valve needle assembly 20 to move toward the valve port 121, thereby increasing the stopping force between the valve needle assembly 20 and the valve seat assembly 10 when the valve needle assembly 20 closes the valve port 121, so that the valve needle assembly 20 can fully close the valve port 121, avoiding the existence of a gap between the valve needle assembly 20 and the valve port 121, avoiding leakage, and facilitating improving the qualified rate of the electronic expansion valve 1.

[0169] In some optional embodiments of the present application, the first elastic member 43 is located on the side of the guide seat 30 facing the valve port 121, so that the first elastic member 43 can apply an elastic force to the valve needle assembly 20 to move toward the valve port 121, so that the valve needle assembly 20 can fully close the valve port 121, avoid the existence of a gap between the valve needle assembly 20 and the valve port 121, avoid leakage, and facilitate improving the pass rate of the electronic expansion valve 1.

[0170] As shown in Figures 5 and 19, in this embodiment, the valve seat assembly 10 defines a valve cavity 116, which is located on the side of the guide sleeve 41 facing the valve port 121. The first elastic member 43 is arranged in the valve cavity 116. One end of the first elastic member 43 abuts against the top wall of the valve cavity 116, and the other end abuts against the valve needle assembly 20. When the valve needle assembly 20 closes the valve port 121, the first elastic member 43 is in a compressed state. The first elastic member 43 has an elastic force on the valve needle assembly 20 toward the valve port 121, so that the valve needle assembly 20 can fully close the valve port 121, thereby reducing the possibility of leakage of the electronic expansion valve 1 and improving the qualified rate of the electronic expansion valve 1.

[0171] In some optional embodiments of the present application, as shown in Figures 5 and 9, the valve needle assembly 20 is provided with a mating groove 221, and one end of the first elastic member 43 extends into the mating groove 221. The mating groove 221 limits the radial displacement of the first elastic member 43 so that the first elastic member 43 can apply an elastic force toward the valve port 121 to the valve needle assembly 20, so that the valve needle assembly 20 can fully close the valve port 121.

[0172] In some embodiments, as shown in Figure 5, the first elastic member 43 is sleeved on the valve needle assembly 20, one end of the first elastic member 43 extends into the matching groove 221, and the other end of the first elastic member 43 stops at the valve needle assembly 20. By extending one end of the first elastic member 43 into the matching groove 221, the first elastic member 43 stops at the side wall and bottom wall of the matching groove 221, and the matching groove 221 is used to limit the deformation direction of the first elastic member 43, so that the first elastic member 43 can be smoothly deformed in the up and down directions, so that the first elastic member 43 can have a downward force on the valve needle assembly 20, so that the valve needle assembly 20 can open or close the valve port 121.

[0173] In some optional embodiments of the present application, as shown in Figures 3 and 19, the valve seat assembly 10 defines a valve cavity 116, which is located on the side of the guide sleeve 41 facing the valve port 121. The valve cavity 116 is communicated with the valve port 121, and a portion of the valve needle assembly 20 can move back and forth in the valve cavity 116. The valve needle assembly 20 divides the valve cavity 116 into a first chamber 181 and a second chamber 182. The second chamber 182 is communicated with the valve port 121. A balancing hole 23 is provided on the valve needle assembly 20, which connects the first chamber 181 and the second chamber 182 to balance the air pressure in the first chamber 181 and the second chamber 182, so that the valve needle assembly 20 can move back and forth smoothly in the valve cavity 116, so that the valve needle assembly 20 can smoothly open or close the valve port 121.

[0174] When the refrigerant flows into the second chamber 182, the refrigerant can flow along the balancing hole 23 into the first chamber 181 to lubricate the first elastic member 43 in the valve chamber 116, and at the same time lubricate the valve needle assembly 20 so that the valve needle assembly 20 can move back and forth smoothly.

[0175] The liquid in the first chamber 181 can enter the receiving groove 125 through the gap between the valve needle assembly 20 and the valve seat assembly 10, and then lubricate the guide seat 30 and the mating bearing 42 in the receiving groove 125, so as to achieve lubrication of the components in the valve needle assembly 20.

[0176] In some embodiments of the present application, as shown in Figure 2, the valve seat assembly 10 includes a valve body 11, a valve seat 12 and a flow channel seat 13, the valve seat 12 is provided with a valve port 121, the flow channel seat 13 is fixed between the valve seat 12 and the valve body 11, the flow channel seat 13 is provided with at least one inlet 131, the valve port 121 is located in the moving direction of the valve needle assembly 20, the inlet 131 is located perpendicular to the moving direction of the valve needle assembly 20, and the inlet 131 is located on the side wall of the flow channel seat 13. The liquid can flow into the valve seat assembly 10 from the inlet 131 from the side wall of the flow channel seat 13, and flow out from the valve port 121 in the valve seat assembly 10.

[0177] In some embodiments, a plurality of inlets 131 are provided on the peripheral wall of the flow channel seat 13 . The plurality of inlets 131 are spaced apart along the circumference of the flow channel seat 13 so that external liquid can enter the fluid space 101 evenly through the plurality of inlets 131 .

[0178] In some embodiments of the present application, as shown in Figures 5, 26 and 27, the valve seat assembly 10 includes a valve seat 12, a flow channel seat 13 and a valve sleeve 14. The flow channel seat 13 is provided with at least one inlet 131. The valve sleeve 14 is fixed between the valve seat 12 and the flow channel seat 13. The valve sleeve 14 can seal the gap between the valve seat 12 and the flow channel seat 13 to prevent the liquid in the valve seat assembly 10 from flowing out from the gap between the valve seat 12 and the flow channel seat 13, thereby facilitating the sealing of the electronic expansion valve 1 and reducing the possibility of internal leakage of the electronic expansion valve 1.

[0179] The valve sleeve 14 is provided with a valve port 121. The valve sleeve 14 and the flow channel seat 13 are interference fit in the radial direction to limit the position of the valve sleeve 14 in the flow channel seat 13 along the radial direction, thereby preventing the valve sleeve 14 from moving along its radial direction, thereby facilitating the coaxiality of the flow channel seat 13 and the valve sleeve 14, ensuring the coaxiality of the valve sleeve 14 and the valve seat 12, and preventing the valve sleeve 14 from moving relative to the flow channel seat 13 or the valve seat 12 along its radial direction, so that the valve sleeve 14 can fully seal the gap between the flow channel seat 13 and the valve seat 12, thereby improving the sealing performance of the electronic expansion valve 1.

[0180] In some optional embodiments of the present application, the flow channel seat 13 is provided with a mating protrusion 132, and a portion of the outer peripheral wall of the valve sleeve 14 is interference fit with the mating protrusion 132, so that the valve sleeve 14 and the mating protrusion 132 are tightly fitted, so that the valve sleeve 14 can fully seal the gap between the valve seat 12 and the flow channel seat 13 to prevent liquid from flowing out of the gap between the valve seat 12 and the flow channel seat 13, thereby facilitating the sealing of the electronic expansion valve 1 and reducing the possibility of internal leakage of the electronic expansion valve 1.

[0181] In addition, a portion of the outer peripheral wall of the valve sleeve 14 is interference fit with the matching protrusion 132, and the matching protrusion 132 squeezes the outer peripheral wall of the valve sleeve 14 to prevent the valve sleeve 14 from moving in its radial direction, thereby facilitating the coaxiality of the flow channel seat 13 and the valve sleeve 14, and the coaxiality of the valve sleeve 14 and the valve seat 12, and preventing the valve sleeve 14 from moving in its radial direction relative to the flow channel seat 13 or the valve seat 12, so that the valve sleeve 14 can fully seal the gap between the flow channel seat 13 and the valve seat 12, thereby improving the sealing performance of the electronic expansion valve 1.

[0182] In some embodiments, the inner walls of the valve sleeve 14 respectively cooperate with the inner walls of the valve seat 12 and the inner walls of the flow channel seat 13 to define a fluid space 101. The fluid space 101 is respectively connected to the valve port 121 and the inlet 131. The liquid can flow from the inlet 131 of the peripheral wall of the flow channel seat 13 into the fluid space 101 and flow out of the fluid space 101 from the valve port 121. At least a portion of the valve needle assembly 20 is reciprocatingly arranged in the fluid space 101. When the valve needle assembly 20 moves reciprocatingly, the valve needle assembly 20 can open or close the valve port 121. When the valve needle assembly 20 and the valve sleeve 14 are in abutment with each other, the valve needle assembly 20 closes the valve port 121.

[0183] Among them, a part of the outer peripheral wall of the valve sleeve 14 is interference fit with the matching protrusion 132, and the matching protrusion 132 can squeeze the outer peripheral wall of the valve sleeve 14 to prevent the valve sleeve 14 from moving along its radial direction, thereby ensuring the coaxiality of the flow channel seat 13 and the valve sleeve 14, and ensuring the coaxiality of the valve sleeve 14 and the valve needle assembly 20, so that when the valve needle assembly 20 moves to close the valve port 121, the valve needle assembly 20 can fully stop and fit with the valve sleeve 14, avoiding a gap between the valve needle assembly 20 and the valve sleeve 14, thereby facilitating the improvement of the sealing performance of the electronic expansion valve 1 when closing the valve port 121, and facilitating the reduction of the possibility of internal leakage of the electronic expansion valve 1.

[0184] In some embodiments, as shown in Figure 33, the inner side of the valve sleeve 14 has a mating bevel 144. When the valve needle assembly 20 moves to close the valve port 121, the valve needle assembly 20 and the mating bevel 144 are stopped and engaged. This facilitates increasing the stopping force between the valve needle assembly 20 and the valve sleeve 14, so that the valve needle assembly 20 and the valve sleeve 14 can fully stop, and the valve needle assembly 20 can fully close the valve port 121.

[0185] In some embodiments, the valve sleeve 14 is a non-metallic part, so that when the valve sleeve 14 is set on the flow channel seat 13 and the valve seat 12, it is convenient to reduce the wear of the valve sleeve 14 on the flow channel seat 13 or the valve seat 12, and ensure that the valve sleeve 14 seals the gap between the flow channel seat 13 and the valve seat 12.

[0186] In some examples, the valve sleeve 14 is made of rubber, synthetic resin, plant fiber or animal leather, so that the valve sleeve 14 can fully seal the gap between the flow channel seat 13 and the valve seat 12, thereby improving the sealing performance of the electronic expansion valve 1 and reducing the possibility of internal leakage of the electronic expansion valve 1.

[0187] In some specific embodiments of the present application, as shown in Figures 26 and 27, the mating protrusion 132 is clamped between the valve sleeve 14 and the valve seat 12, and the valve seat 12 can limit the position of the mating protrusion 132 along its radial direction, thereby preventing the flow channel seat 13 and the valve sleeve 14 from being displaced along their radial direction together, thereby facilitating the coaxiality between the valve seat 12, the valve sleeve 14 and the flow channel seat 13, and enabling the valve sleeve 14 to fully seal the gap between the valve seat 12 and the flow channel seat 13, thereby reducing the possibility of internal leakage of the electronic expansion valve 1.

[0188] As shown in Figure 27, in this embodiment, the valve sleeve 14 has a first protrusion 141, which extends upward in the up-down direction, and the valve seat 12 has a second protrusion 123, which extends upward in the front-to-back direction, and the mating protrusion 132 extends downward in the up-down direction. The mating protrusion 132 is clamped between the first protrusion 141 and the second protrusion 123, and the first protrusion 141 is located on the inner side of the mating protrusion 132. The mating protrusion 132 is interference fit with the outer peripheral wall of the first protrusion 141, and the second protrusion 123 is located on the outer side of the mating protrusion 132.

[0189] It should be noted here that the above-mentioned inner and outer sides are relative to the center line of the mating protrusion 132. The direction close to the center line of the mating protrusion 132 is the inner side, and the direction away from the center line of the mating protrusion 132 is the outer side.

[0190] Among them, the mating protrusion 132 is interference fit with the outer peripheral wall of the first protrusion 141, and the mating protrusion 132 has an inward extrusion force along the radial direction of the outer peripheral wall of the first protrusion 141 to limit the position of the first protrusion 141 along the radial direction, thereby preventing the valve sleeve 14 from moving along the radial direction relative to the flow channel seat 13.

[0191] The second protrusion 123 is located on the outside of the mating protrusion 132. The second protrusion 123 has an inward extrusion force along the radial direction on the outer peripheral wall of the mating protrusion 132, so as to limit the position of the mating protrusion 132 along the radial direction, and prevent the flow channel seat 13 and the valve sleeve 14 from moving along the radial direction relative to the valve seat 12, so as to ensure the coaxiality between the valve seat 12, the valve sleeve 14 and the flow channel seat 13, so that the valve sleeve 14 can fully seal the gap between the valve seat 12 and the flow channel seat 13, so as to reduce the possibility of internal leakage of the electronic expansion valve 1.

[0192] In some embodiments, the surfaces of the valve seat 12 and the valve sleeve 14 facing each other are sealed to ensure the sealing between the valve sleeve 14 and the valve seat 12 , thereby reducing the possibility of internal leakage of the electronic expansion valve 1 .

[0193] As shown in Figures 26, 27 and 29, in this embodiment, the flow channel seat 13 is arranged above the valve sleeve 14, the valve sleeve 14 is arranged above the valve seat 12, the valve seat 12 defines a first cavity 124, the lower part of the valve sleeve 14 is located in the first cavity 124, the lower wall surface of the valve sleeve 14 is sealed with the bottom wall of the first cavity 124 to ensure the sealing between the valve sleeve 14 and the valve seat 12, so as to reduce the possibility of internal leakage of the electronic expansion valve 1.

[0194] In some examples, the outer wall of the lower portion of the valve sleeve 14 is sealed with the side wall of the first cavity 124 to further seal the gap between the valve sleeve 14 and the valve seat 12, thereby ensuring the sealing between the valve sleeve 14 and the valve seat 12 and reducing the possibility of internal leakage of the electronic expansion valve 1.

[0195] In some embodiments, as shown in Figures 26, 27, and 31, the surfaces of the valve sleeve 14 and the flow channel seat 13 facing each other are sealed together, the mating protrusion 132 defines a second cavity 133, the upper part of the valve sleeve 14 is located in the second cavity 133, the upper wall of the valve sleeve 14 is sealed together with the top wall of the second cavity 133, and the outer wall of the upper part of the valve sleeve 14 is sealed together with the inner wall of the mating protrusion 132 to ensure the sealing between the flow channel seat 13 and the valve sleeve 14, to prevent liquid from flowing out of the gap between the flow channel seat 13 and the valve sleeve 14, and to reduce the possibility of internal leakage of the electronic expansion valve 1.

[0196] In some specific embodiments of the present application, as shown in Figure 27, a sealing ring 15 is further provided between the valve sleeve 14 and the valve seat 12 to further ensure the sealing degree between the valve seat 12 and the valve sleeve 14, prevent liquid from flowing out from the gap between the valve seat 12 and the valve sleeve 14, and reduce the possibility of internal leakage of the electronic expansion valve 1.

[0197] In some embodiments, as shown in Figure 27, the mating protrusion 132 stops at the valve sleeve 14 so that the sealing ring 15 is compressed and fixed between the valve seat 12 and the valve sleeve 14, so that the sealing ring 15 can fully seal the gap between the valve sleeve 14 and the valve seat 12 to prevent liquid from flowing out of the gap between the valve seat 12 and the valve sleeve 14.

[0198] As shown in Figures 27 and 32, in this embodiment, the outer peripheral wall of the valve sleeve 14 is provided with a step portion 143, and the cooperating protrusion 132 stops at the step portion 143 to provide the valve sleeve 14 with a stopping force toward the valve seat 12. On the one hand, it ensures the sealing fit between the valve sleeve 14 and the valve seat 12, and on the other hand, it enables the valve sleeve 14 to have a stopping force on the sealing ring 15 toward the valve seat 12, so that the sealing ring 15 is compressed and fixed between the valve seat 12 and the valve sleeve 14, so that the sealing ring 15 can fully seal the gap between the valve seat 12 and the valve sleeve 14.

[0199] In some embodiments, as shown in Figures 27 and 29, the valve seat 12 is provided with a groove 122, and the sealing ring 15 is provided in the groove 122 to increase the contact area between the sealing ring 15 and the valve seat 12, thereby enabling the sealing ring 15 to fully seal the gap between the valve seat 12 and the valve sleeve 14.

[0200] Among them, by providing the groove 122, the sealing ring 15 is provided in the groove 122, which is convenient for improving the sealing between the valve sleeve 14 and the valve seat 12. Specifically, the surfaces of the valve seat 12 and the valve sleeve 14 facing each other are flat, and the gap that may be formed between the valve seat 12 and the valve sleeve 14 is a straight gap. The liquid is easy to flow out along the straight gap. By providing the groove 122, the sealing ring 15 is provided in the groove 122, which is convenient for changing the straight gap between the valve seat 12 and the valve sleeve 14 into a gap with a bend. This setting is convenient for improving the sealing degree between the valve seat 12 and the valve sleeve 14, making it difficult for the liquid to flow out through the bent gap, and is convenient for reducing the possibility of leakage within the electronic expansion valve 1.

[0201] As shown in Figure 29, in this embodiment, the valve seat 12 defines a first cavity 124, the lower part of the valve sleeve 14 is located in the first cavity 124, and a part of the bottom wall of the first cavity 124 is recessed downward to form a groove 122. Since the mating protrusion 132 stops at the valve sleeve 14, the mating protrusion 132 has a downward extrusion force on the valve sleeve 14, so that the lower wall surface of the valve sleeve 14 is sealed with the bottom wall of the first cavity 124, so that the lower wall surface of the valve sleeve 14 has a downward extrusion force on the sealing ring 15, so as to compress the sealing ring 15 and compress the sealing ring 15 into the groove 122.

[0202] Among them, when the groove 122 and the sealing ring 15 are not provided, a gap extending in the horizontal direction may be formed between the lower wall surface of the valve sleeve 14 and the bottom wall of the first cavity portion 124. By providing the groove 122, the sealing ring 15 is compressed and arranged in the groove 122, so that the sealing ring 15 can fully seal the valve sleeve 14 and the bottom wall of the first cavity portion 124 in the up and down directions, so that the gap between the valve sleeve 14 and the valve seat 12 has a bending portion, making it difficult for liquid to flow out through the gap between the valve sleeve 14 and the valve seat 12, thereby reducing the possibility of internal leakage of the electronic expansion valve 1.

[0203] In some embodiments of the present application, the valve needle assembly 20 includes a valve stem 21, a valve needle 22 and a second elastic member 24. The valve needle 22 cooperates with the valve stem 21 to be driven to move back and forth by the valve stem 21. The second elastic member 24 is respectively connected to the valve stem 21 and the valve needle 22 to apply a force to the valve needle 22 to move toward the valve port 121, so as to increase the force between the valve needle 22 and the valve port 121 when the valve needle 22 closes the valve port 121, so that the valve needle 22 can fully close the valve port 121, thereby reducing the possibility of leakage of the electronic expansion valve 1 when closing the valve port 121, thereby facilitating improving the pass rate of the electronic expansion valve 1.

[0204] In some optional embodiments of the present application, 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 spaced apart in the moving direction of the valve stem 21. The valve needle 22 is provided with a second stop member 222, and at least a portion of the second stop member 222 is located between the first stop surface 215 and the second stop surface 216. The valve needle 22 is movable relative to the valve stem 21 so that the second stop member 222 switches to stop with the first stop surface 215 and the second stop surface 216. 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 second elastic member 24 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 second elastic member 24 can be controlled, and then the magnitude of the force exerted by the second elastic member 24 on the valve needle 22 can be controlled, so as to ensure that the valve needle 22 can fully close the valve port 121 while avoiding failure of the second elastic member 24.

[0205] In some specific embodiments of the present application, the anti-rotation assembly includes a guide seat 30 and a guide sleeve 41. The guide seat 30 is arranged on the valve seat assembly 10, and the guide sleeve 41 is arranged on the valve needle assembly 20. The guide sleeve 41 and the guide seat 30 are anti-rotationally matched to limit the rotation of at least the part of the valve needle assembly 20 that cooperates with the valve port 121. When the valve needle assembly 20 moves back and forth, under the restriction of the guide seat 30, the guide sleeve 41 and the part of the valve needle assembly 20 that cooperates with the valve port 121 can only move in the valve seat assembly 10 but cannot rotate, so that when the valve needle assembly 20 opens or closes the valve port 121, the friction between the part of the valve needle assembly 20 that cooperates with the valve port 121 and the valve seat assembly 10 can be reduced, thereby facilitating the reduction of noise generated in the electronic expansion valve 1, reducing the degree of mutual wear between the valve needle assembly 20 and the valve seat assembly 10, and facilitating the improvement of the service life of the valve needle assembly 20 and the service life of the electronic expansion valve 1.

[0206] In some embodiments, the guide sleeve 41 is fixed to the valve stem 21 or the guide seat 30 and the valve stem 21 are an integral part, and the valve stem 21 is threadedly engaged with the conversion member 50. When the conversion member 50 drives the valve stem 21 to move back and forth, the valve stem 21 has a tendency to rotate. Since the guide sleeve 41 is engaged with the guide seat 30, the guide seat 30 has a stopping force on the guide sleeve 41 to limit the rotational freedom of the guide sleeve 41 and the valve stem 21, and thereby limit the rotational freedom of the valve needle 22. When the valve needle 22 opens or closes the valve port 121, the valve needle 22 can only move back and forth but cannot rotate, thereby reducing the wear between the valve needle 22 and the valve seat assembly 10.

[0207] In other embodiments, the guide sleeve 41 is fixed to the valve needle 22 or the guide seat 30 and the valve needle 22 are an integral part, the valve needle 22 and the valve stem 21 are rotationally matched, and the valve stem 21 is threadedly matched with the conversion member 50. When the conversion member 50 drives the valve stem 21 to move back and forth, when the valve stem 21 rotates, since the guide sleeve 41 is matched with the guide seat 30, the guide seat 30 has a stopping force on the guide sleeve 41, and thus has a stopping force on the valve needle 22. When the valve needle 22 opens or closes the valve port 121, the valve needle 22 can only move back and forth but cannot rotate, thereby reducing the wear between the valve needle 22 and the valve seat assembly 10.

[0208] In some specific embodiments of the present application, the valve needle 22 is provided with a second stopper 222 , and the guide sleeve 41 is provided on the side of the second stopper 222 away from the valve port 121 , and the guide sleeve 41 is suitable for abutting against the second stopper 222 to limit the movement of the valve needle 22 .

[0209] In some embodiments, the guide sleeve 41 defines a second stop surface 216 on a side facing the valve needle 22. The second stop member 222 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, with the first mating surface 231 located below the second mating surface 232. When the valve needle assembly 20 closes the valve port 121, the second mating surface 232 abuts against the second stop surface 216. When the valve needle assembly 20 opens the valve port 121, the first mating surface 231 abuts against the first stop surface 215.

[0210] Among them, when the valve needle assembly 20 closes the valve port 121, when the valve stem 21 and the guide sleeve 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 121. At the same time, the valve stem 21 compresses the second elastic member 24, so that the second elastic member 24 has a force on the valve needle 22 toward the valve port 121, so that the valve needle 22 can fully block the valve port 121.

[0211] Specifically, the second stop surface 216 is engaged with the second mating surface 232 to control the compression amount of the second elastic member 24 by the valve stem, thereby preventing the second elastic member 24 from failing.

[0212] When the valve needle assembly 20 closes the valve port 121, when the valve stem 21 and the guide sleeve 41 move upward relative to the valve needle 22, the valve needle 22 moves upward relative to the valve stem 21, the second stop member 222 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 121.

[0213] In some embodiments, the second elastic member 24 extends in the up and down directions. When the valve needle 22 blocks the valve port 121, the second elastic member 24 exerts a downward force on the valve needle 22, so that the valve needle 22 can fully block the valve port 121, thereby preventing the electronic expansion valve 1 from leaking when blocking the valve port 121, thereby improving the pass rate of the electronic expansion valve 1.

[0214] In some optional embodiments of the present application, the electronic expansion valve 1 also includes a first elastic member 43, the valve seat 12 is provided with a valve cavity 116 connected to the valve port 121, the valve needle assembly 20 moves back and forth in the valve cavity 116, and the first elastic member 43 stops between the valve needle assembly 20 and the inner wall of the valve cavity 116 to apply an elastic force to the valve needle assembly 20 toward the valve port 131, thereby increasing the stopping force between the valve needle assembly 20 and the valve seat 12, so that the valve needle assembly 20 can fully close the valve port 121, avoiding the existence of a gap between the valve needle assembly 20 and the valve port 121, avoiding leakage, and facilitating improving the pass rate of the electronic expansion valve 1.

[0215] As shown in Figures 3 and 9, the valve needle 21 defines a mating groove 221, and a portion of the first elastic member 43 is located in the mating groove 221. The upper end of the first elastic member 43 stops at the top wall of the valve cavity 116, and the lower end of the first elastic member 43 stops at the bottom wall of the mating groove 221. A portion of the first elastic member 43 contacts and cooperates with the side wall of the mating groove 221 to utilize the mating groove 221 to limit the radial displacement of the first elastic member 43, so that the first elastic member 43 can apply an elastic force toward the valve port 121 to the valve needle 21, so that the valve needle 21 can fully close the valve port 121.

[0216] 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.

[0217] 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 rotation of the valve needle assembly 20 is restricted by utilizing the anti-rotation assembly, thereby facilitating the reduction of wear between the valve needle assembly 20 and the valve seat assembly 10, and having the advantages of increasing the service life of the valve needle assembly 20 and the valve seat assembly 10, and reducing the noise generated in the electronic expansion valve 1, etc.

[0218] A vehicle 91 according to an embodiment of the present application will be described below with reference to FIG 34. 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.

[0219] 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 rotation of the valve needle assembly 20 is restricted by using a rotation stop assembly, thereby reducing the wear between the valve needle assembly 20 and the valve seat assembly 10, and having the advantages of increasing the service life of the valve needle assembly 20 and the valve seat assembly 10, and reducing the noise generated in the electronic expansion valve 1.

[0220] 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.

[0221] 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.

[0222] 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. An electronic expansion valve, characterized in that: include: A valve seat assembly, wherein the valve seat assembly is provided with a valve port; A valve needle assembly, the valve needle assembly is reciprocably disposed on the valve seat assembly to open or close the valve port; A rotation-stop assembly is provided between the valve seat assembly and the valve needle assembly, and is used for limiting the rotation of at least a portion of the valve needle assembly that cooperates with the valve port.

2. The electronic expansion valve according to claim 1, characterized in that: The anti-rotation assembly comprises: A guide seat, the guide seat being arranged on the valve seat assembly; A guide sleeve is arranged on the valve needle assembly, and the guide sleeve is anti-rotatably matched with the guide seat to limit the rotation of at least a part of the valve needle assembly that cooperates with the valve port.

3. The electronic expansion valve according to claim 2, characterized in that: The guide sleeve outer sleeve is fixed to the valve needle assembly.

4. The electronic expansion valve according to claim 3, characterized in that: The outer peripheral wall of the valve needle assembly is provided with a first step surface for supporting the guide sleeve.

5. The electronic expansion valve according to claim 4, characterized in that: The outer peripheral wall of the valve needle assembly is provided with a guiding inclined surface, and the guiding inclined surface extends obliquely toward the first step surface to guide the installation of the guide sleeve.

6. The electronic expansion valve according to claim 5, characterized in that: The guide sleeve is located between the guide inclined surface and the first step surface.

7. The electronic expansion valve according to any one of claims 2 to 6, characterized in that: The guide seat and the valve seat assembly are an integral part; and / or The guide sleeve and the valve needle assembly are an integral part.

8. The electronic expansion valve according to any one of claims 2 to 7, characterized in that: The outer peripheral wall of the guide sleeve along the radial cross section of the valve needle assembly is formed into a non-circular shape, and the outer peripheral wall of the guide sleeve is suitable for cooperating with the guide seat to limit the rotational freedom of the guide sleeve.

9. The electronic expansion valve according to any one of claims 2 to 8, characterized in that: A first stopper is provided on a side of the cavity of the guide seat away from the valve port, and the first stopper cooperates with the guide sleeve to limit the movement and displacement of the guide sleeve.

10. The electronic expansion valve according to any one of claims 2 to 9, characterized in that: Also includes: a conversion member, the 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; A matching bearing is provided between the conversion member and the valve seat assembly.

11. The electronic expansion valve according to claim 10, characterized in that: The valve seat assembly is provided with a receiving groove, the guide seat is arranged in the receiving groove, and the guide seat is clamped between the first bottom wall of the receiving groove and the matching bearing.

12. The electronic expansion valve according to claim 11, characterized in that: A first chamfer is provided between the first bottom wall and the first inner peripheral wall of the accommodating groove, and a second chamfer is provided between the placement end surface of the guide seat and the outer peripheral wall of the guide seat.

13. The electronic expansion valve according to claim 12, characterized in that: The placement end surface is supported on the first bottom wall, and the second chamfer is spaced apart from the first chamfer.

14. The electronic expansion valve according to any one of claims 11 to 13, characterized in that: The valve seat assembly is provided with a first stopper, which contacts a side of the matching bearing away from the valve port to limit the axial displacement of the matching bearing.

15. The electronic expansion valve according to claim 14, characterized in that: The valve seat assembly includes a valve body, which is a metal piece, and a portion of the metal piece is bent inward to define the first stopper.

16. The electronic expansion valve according to any one of claims 11 to 15, characterized in that: The mating bearing is provided with an inner ring assembly and an outer ring assembly which can rotate relative to each other, the conversion member is provided with a second stop portion and a third stop portion which are arranged at intervals along the axial direction, the inner ring assembly is arranged between the second stop portion and the third stop portion, the second stop portion is located on the side of the third stop portion facing the valve port, and the outer ring assembly is arranged on the valve seat assembly.

17. The electronic expansion valve according to claim 16, characterized in that: An annular groove is disposed on the outer peripheral wall of the conversion member, and an end surface of the annular groove that is arranged opposite to the second stop portion defines the third stop portion.

18. The electronic expansion valve according to claim 16 or 17, characterized in that: The conversion member includes a first metal member, a portion of which is bent outward to define the second stopper.

19. The electronic expansion valve according to any one of claims 10 to 18, characterized in that: Also comprising a rotor component, the conversion member comprises a first portion and a second portion which are fixedly connected, the first portion cooperates with the valve needle assembly to convert the rotation of the conversion member into a reciprocating movement of the valve needle assembly; The second portion cooperates with the rotor component to be driven to rotate by the rotor component.

20. The electronic expansion valve according to claim 19, characterized in that: The second portion is formed as a metal part, and the second portion is connected to the rotor component by welding.

21. The electronic expansion valve according to any one of claims 1 to 20, characterized in that: A fitting is provided in the valve seat assembly, and the electronic expansion valve further comprises a rotating assembly, which cooperates with the valve needle assembly so that the rotation of the rotating assembly is converted into reciprocating movement of the valve needle assembly, and the rotating assembly cooperates with the fitting to radially limit the rotating assembly.

22. The electronic expansion valve according to claim 21, characterized in that: The rotating assembly is plugged into and rotationally matched with the matching piece.

23. The electronic expansion valve according to any one of claims 1 to 22, characterized in that: It also includes a first elastic member, which cooperates with the valve needle assembly and the valve seat assembly respectively to apply an elastic force to the valve needle assembly to move toward the valve port.

24. The electronic expansion valve according to claim 23, characterized in that: The valve needle assembly is provided with a matching groove, one end of the first elastic member extends into the matching groove, and the matching groove limits the radial displacement of the first elastic member.

25. The electronic expansion valve according to any one of claims 1 to 24, characterized in that: The valve seat assembly comprises: Valve seat; A flow channel seat, wherein the flow channel seat is provided with at least one inlet; The valve sleeve is fixed between the valve seat and the flow channel seat, the valve sleeve is provided with the valve port, and the valve sleeve and the flow channel seat are radially connected. Profitable cooperation.

26. The electronic expansion valve according to claim 25, characterized in that: The flow channel seat is provided with a matching protrusion, and a portion of the outer peripheral wall of the valve sleeve is interference-fitted with the matching protrusion in the radial direction.

27. The electronic expansion valve according to claim 25, characterized in that: A sealing ring is also provided between the valve sleeve and the valve seat.

28. The electronic expansion valve according to any one of claims 1 to 27, characterized in that: The valve needle assembly comprises: Valve stem; a valve needle, the valve needle cooperates with the valve stem to be driven by the valve stem to move back and forth; A second elastic member, wherein the second elastic member is connected to the valve stem and the valve needle respectively, so as to apply a force to the valve needle to move toward the valve port when the valve needle assembly closes the valve port.

29. The electronic expansion valve according to claim 28, characterized in that: The valve stem is provided with a first stop surface and a second stop surface, and the first stop surface and the second stop surface are arranged at intervals in the moving direction of the valve stem; The valve needle is provided with a second stopper, at least a portion of which 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 second stopper switches between the first stopper surface and the second stopper surface.

30. The electronic expansion valve according to claim 28 or 29, characterized in that: The anti-rotation assembly comprises a guide seat and a guide sleeve, wherein the guide seat is arranged on the valve seat assembly, the guide sleeve is arranged on the valve needle assembly, and the guide sleeve is anti-rotationally matched with the guide seat to limit the rotation of at least a portion of the valve needle assembly that cooperates with the valve port; The valve needle is provided with a second stopper, the guide sleeve is provided on a side of the second stopper away from the valve port, and the guide sleeve is suitable for abutting against the second stopper to limit the movement of the valve needle.

31. The electronic expansion valve according to any one of claims 25 to 30, characterized in that: Also includes a first elastic member, The valve seat is provided with a valve cavity connected to the valve port, the valve needle assembly reciprocates in the valve cavity, and the first elastic member stops between the valve needle assembly and the inner wall of the valve cavity to apply an elastic force to the valve needle assembly toward the valve port.

32. The electronic expansion valve according to any one of claims 28 to 31, characterized in that: The anti-rotation assembly is arranged between the valve needle and the valve seat assembly.

33. A thermal management system, characterized in that: Comprising an electronic expansion valve according to any one of claims 1-32.

34. A vehicle, characterized in that: Comprising a thermal management system according to claim 33.

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