Valve assembly

Abstract

The valve assembly is used for an electronic expansion valve and comprises a lead screw, a rotor, a valve element assembly and a valve seat, the rotor is fixed to the lead screw, the valve seat is provided with a first channel, at least part of the valve element assembly is located in the first channel, the valve assembly is provided with a valve port part, and the valve element assembly can move relative to the valve port part. The lead screw is static in the axial direction relative to the valve seat. The lead screw is provided with a connection matching part located in the valve element assembly, the connection matching part is in threaded connection with the valve element assembly, the valve element assembly is in limiting fit with the wall corresponding to the first channel in the circumferential direction, and the valve element assembly can move up and down in the axial direction along the connection matching part. Due to the fact that the valve element assembly can move up and down along the connection matching part, and the lead screw is static relative to the valve seat in the axial direction, the situation that the needed shell length is increased due to the fact that the lead screw and the valve element assembly move up and down together is avoided, and the size is reduced.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve assembly. Background Art

[0002] In the related art, the electronic expansion valve includes a rotor, a screw rod, a nut and a valve core assembly. The rotor is fixed to one end of the screw rod, the screw rod is passed through the nut, and the screw rod and the nut thread cooperate. The other end of the screw rod is connected to the valve core assembly. When the rotor drives the screw rod to rotate circumferentially, it can move up and down, thereby driving the valve core assembly to move up and down to approach or move away from the valve port. However, since the screw rod needs to drive the valve core assembly to move up and down together, and the rotor is fixed to the screw rod, the shell needs to provide an accommodation space for the screw rod's stroke, which results in a long length and large volume of the shell. Summary of the invention

[0003] In order to solve the above technical problems, the following technical solutions are provided:

[0004] A valve assembly comprises a screw rod, a rotor, a valve core assembly and a valve seat, wherein the rotor is fixed to the screw rod, the valve seat has a first channel, the valve core assembly is at least partially located in the first channel, the valve assembly has a valve port, and the valve core assembly can move relative to the valve port.

[0005] In the axial direction, the screw is stationary relative to the valve seat;

[0006] One end of the screw rod has a connecting fitting portion, which is at least partially located in the valve core assembly and is threadedly connected to the valve core assembly. The valve core assembly is limitedly fitted with the wall corresponding to the first channel in the circumferential direction, and the valve core assembly can move up and down in the axial direction along the connecting fitting portion.

[0007] Since the connecting fitting part of the valve core assembly and the screw rod is threadedly connected, and the valve core assembly and the wall corresponding to the first channel are limited in the circumferential direction, when the screw rod rotates, the valve core assembly can move up and down along the connecting fitting part in the axial direction relative to the screw rod, while the screw rod is stationary in the axial direction relative to the valve seat. In this way, the increase in the required shell length caused by the up and down movement of the screw rod and the valve core assembly is avoided, thereby reducing the volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of an embodiment of the present application;

[0009] Figure 2 for Figure 1 A magnified schematic diagram of the middle area A;

[0010] Figure 3 for Figure 1 Schematic diagram of the middle connector;

[0011] Figure 4 for Figure 1 A three-dimensional schematic diagram of the matching parts;

[0012] Figure 5 for Figure 4 A cross-sectional schematic diagram of a matching part;

[0013] Figure 6 for Figure 1 The intention of the middle valve seat;

[0014] Figure 7 for Figure 1 A three-dimensional schematic diagram of the middle valve core body;

[0015] Figure 8 This is a schematic structural diagram of another embodiment of the present application;

[0016] Fig. 9 for Figure 8 A magnified schematic diagram of the middle area B;

[0017] Fig.10 This is a structural schematic diagram of another embodiment of the present application;

[0018] Fig.11 This is a structural schematic diagram of yet another embodiment of the present application;

[0019] Fig.12 for Fig.11 A magnified schematic diagram of the middle area C;

[0020] Fig.13 This is a structural schematic diagram of another embodiment of the present application;

[0021] Fig.14 for Fig.13 Schematic diagram of the enlarged area D in the middle.

[0022] Reference numerals:

[0023] 1. Valve core assembly; 2. Screw rod; 3. Valve seat; 4. Bearing parts;

[0024] 10. valve core body; 101. accommodating cavity; 102. first matching groove; 103. first opening; 11. matching piece; 110. body part; 111. first limiting part; 112. extending part; 12. elastic piece; 13. fixing piece; 131. first through hole;

[0025] 20. first main body; 21. connecting and matching portion; 22. first step portion; 210. first groove; 212. first stopper;

[0026] 31. first channel; 32. valve port; 33. second matching groove; 34. first end; 35. second end; 341. position limiting step; 36. third step;

[0027] 5. Shell; 51. Inner cavity; 52. Fourth main body; 53. Guide portion; 54. Second limiting groove portion; 55. Fourth step portion;

[0028] 6. Second limiting member; 60. Second main body; 61. Limiting groove; 62. Circumferential matching portion; 621. Flanging portion;

[0029] 7. Connecting seat; 71. First limiting flange; 72. Second channel; 8. Rotor; 81. Third main body; 82. Connecting part; 83. Second step part; 84. First limiting groove; 9. Third limiting member. DETAILED DESCRIPTION

[0030] The technical scheme of a specific implementation method is described below in conjunction with the accompanying drawings. The valve assembly of the present application can be used for an electronic expansion valve. For example, the valve assembly of the present application can be assembled with a valve body to form a single electronic expansion valve, or it can be assembled with a system or component with a flow channel structure to form a multifunctional device that can have the function of an electronic expansion valve. The valve assembly of the present application can also be used directly as an electronic expansion valve. The valve assembly of the present application is used for throttling of fluid.

[0031] like Figure 1-7 As shown, a valve assembly includes a screw rod 2, a rotor, a valve core assembly 1 and a valve seat 3, the valve seat 3 has a first channel 31, the rotor is fixed to the screw rod, the valve core assembly 1 is at least partially located in the first channel 31, the valve assembly has a valve mouth portion 32, the valve core assembly 1 can move relative to the valve mouth portion 32, in the axial direction, the fixed screw rod 2 is stationary relative to the valve seat 3; one end of the screw rod 2 has a connecting fitting portion 21, the connecting fitting portion 21 is at least partially located in the valve core assembly, and the connecting fitting portion 21 is threadedly connected to the valve core assembly 1, the valve core assembly and the wall corresponding to the first channel are limited in the circumferential direction, and the valve core assembly 1 can move up and down in the axial direction along the connecting fitting portion 21.

[0032] Since the valve core assembly 1 is threadedly connected to the connecting fitting portion 21 of the screw rod 2, and the valve core assembly is limitedly fitted with the wall corresponding to the first channel in the circumferential direction, when the screw rod rotates, the valve core assembly 1 can move up and down along the connecting fitting portion 21 in the axial direction relative to the screw rod, while the screw rod 2 is stationary in the axial direction relative to the valve seat 3. In this way, the increase in the required length of the housing 5 due to the up and down movement of the screw rod 2 and the valve core assembly 1 is avoided, thereby reducing the volume.

[0033] The valve core assembly 1 includes a valve core body 10 and a matching piece 11, and the valve core body 10 is slidably matched or clearance matched with the wall corresponding to the first channel 31; the valve core body 10 is provided with a accommodating cavity 101, at least part of the matching piece 11 is located in the accommodating cavity 101, at least part of the connecting matching part 21 is located in the accommodating cavity 101, and the matching piece 11 is threadedly matched with the connecting matching part 21, specifically, the matching piece 11 has a matching through hole running through its body, the wall corresponding to the matching through hole is tapped with an internal thread, the connecting matching part 21 is tapped with an external thread corresponding thereto, and the wall corresponding to the matching through hole is threadedly connected with the connecting matching part 21; the matching piece 11 includes a main body 110 and a first limiting part 111, and the first limiting part 111 at least partially protrudes from the side wall of the main body 110 in the radial direction; the first limiting part 111 is limitedly matched with the valve core body 10 in the circumferential direction, and the valve core body 10 is limitedly matched with the valve seat 3 in the circumferential direction. In this embodiment, the main body 110 and the first limiting portion 111 are integrally arranged; in some embodiments, the main body 110 and the first limiting portion 111 are separately arranged, specifically, the side wall of the main body 110 is provided with a receiving groove to accommodate the first limiting portion 111, and the wall corresponding to the receiving groove is threadedly matched with the first limiting portion 111 or welded and fixed.

[0034] Since the screw rod 2 is threadedly connected to the fitting 11, and the fitting 11 is limitedly matched with the valve core body 10 in the circumferential direction, and the valve core body 10 is limitedly matched with the valve seat 3 in the circumferential direction, when the screw rod 2 rotates, the fitting 11 will move up and down.

[0035] A first matching groove 102 is provided on the wall corresponding to the accommodating chamber 101, and the first matching groove 102 extends downwardly from the opening of the accommodating chamber 101 along the axial direction; a second matching groove 33 is provided on the wall corresponding to the first channel 31, and the second matching groove 33 extends downwardly from the end of the valve seat 3 along the axial direction; a part of the first limiting portion 111 is located in the first matching groove 102, and the first limiting portion 111 is circumferentially limited with the wall corresponding to the first matching groove 102, and the first limiting portion 111 can move in the axial direction along the first matching groove 102; a part of the first limiting portion 111 is located in the second matching groove 33, and the first limiting portion 111 is circumferentially limited with the second matching groove 33, and the first limiting portion 111 can move in the axial direction along the second matching groove 33.

[0036] The first matching groove 102 extends downwardly along the axial direction from the opening of the accommodating cavity 101, so that the first matching groove 102 provides an accommodating space for the first limiting portion 111, thereby facilitating the fitting 11 to be installed into the accommodating cavity 101; and the second matching groove 33 extends downwardly along the axial direction from the end of the valve seat 3, and the second matching groove 33 provides an accommodating space for the portion of the first limiting portion 111 exposed from the first matching groove 102, thereby facilitating the valve core assembly 1 to be installed into the first channel 31.

[0037] In the radial direction, the first limiting portion 111 passes through the first matching groove 102, and part of the first limiting portion 111 is located in the second matching groove 33, so that the first limiting portion 111 can realize the limitation of the matching piece 11 and the valve core assembly 1 in the circumferential direction, and also realize the limitation of the valve core assembly 1 and the valve seat 3 in the circumferential direction, thereby preventing the matching piece 11 and the valve core assembly 1 from rotating in the circumferential direction.

[0038] In the axial direction, the distance between the first limit portion 111 and the bottom wall corresponding to the first matching groove 102 is h, and the value of h is always greater than zero; in the axial direction, the minimum distance between the wall corresponding to the first matching groove 102 and the valve mouth portion 32 is a, and the minimum distance between the wall corresponding to the second matching groove 33 and the valve mouth portion 32 is b, and the value of b is greater than the value of a.

[0039] In this way, in the axial direction, the wall corresponding to the second mating groove 33 will abut against the first limiting portion 111 before the wall corresponding to the first mating groove 102, thereby limiting or further limiting the further downward movement of the mating piece 11, and avoiding the wall corresponding to the first mating groove 102 abutting against the first limiting portion 111 before the wall corresponding to the second mating groove 33, causing an impact on the valve core assembly 1; and the distance between the first limiting portion 111 and the bottom wall corresponding to the first mating groove 102 is always greater than zero, which also reduces the influence of the vibration generated when the wall corresponding to the second mating groove 33 abuts against the first limiting portion 111 in the axial direction on the valve core assembly 1.

[0040] The valve core assembly 1 also includes an elastic member 12, which is located in the accommodating chamber 101, and the elastic member 12 is located between the matching member 11 and the bottom wall corresponding to the accommodating chamber 101, and the two ends of the elastic member 12 are respectively abutted against the matching member 11 and the bottom wall corresponding to the accommodating chamber 101; in the present embodiment, the elastic member 12 is a spring; the presence of the elastic member 12 can reduce the impact when the valve core assembly 1 contacts the valve mouth portion 32, and can also absorb the further downward movement of the matching member 11 after the valve core assembly 1 abuts against the valve mouth portion 32.

[0041] The fitting member 11 includes an extension portion 112, which extends downwardly from the end of the main body 110 in the axial direction, and a portion of the elastic member 12 is sleeved on the extension portion 112. The extension portion 112 serves to limit the spring, preventing it from abutting against the connecting fitting portion 21 in the axial direction, resulting in misalignment and deformation. In this embodiment, the elastic member 12 is a spring.

[0042] The valve core assembly 1 includes a fixing member 13, and the accommodating cavity 101 has a first opening 103. In the axial direction, the fixing member 13 is fixed or limited to the wall corresponding to the first opening 103; the fixing member 13 has a first through hole 131, and the first through hole 131 passes through the body of the fixing member 13, and the part of the connecting fitting portion 21 is located in the first through hole 131, and a gap is left between the connecting fitting portion 21 and the wall corresponding to the first through hole 131; in the axial direction, the fitting 11 is closer to the bottom wall corresponding to the accommodating cavity 101 than the fixing member 13; the inner diameter of the first through hole 131 is smaller than the outer diameter of the fitting 11.

[0043] In this way, in the axial direction, the fixing member 13 limits the fitting member 11 , and when the fitting member 11 moves upward, the fitting member 11 abuts against the fixing member 13 , so that the valve core assembly 1 moves upward and separates from the valve port portion 32 .

[0044] In this embodiment, the valve assembly further comprises a bearing member; in the axial direction, the bearing member is sleeved on the screw rod and is fixed or limitedly matched with the screw rod;

[0045] The valve seat 3 has a first end 34 and a second end 35, the first end 34 faces the screw rod 2, and the second end 35 faces away from the screw rod 2. The first end 34 is provided with a limiting step 341, and part of the bearing member 4 is located at the limiting step 341, and the bearing member 4 is fixed to the limiting step 341. The limiting step 341 is provided at the first end 34 to facilitate the installation of the bearing member 4 and the welding and fixing of the bearing member 4 to the limiting step 341.

[0046] The screw rod 2 has a first main body portion 20, a first step portion 22 is provided between the first main body portion 20 and the connection matching portion 21, and the first step portion 22 is fixed to the bearing member 4. The first step portion 22 is provided between the first main body portion 20 and the connection matching portion 21 to facilitate the bearing member 4 to limit the position when the bearing member 4 is inserted into the screw rod 2, and to facilitate the welding and fixing of the bearing member 4 and the first step portion 22.

[0047] The valve assembly further includes a second stopper 6 and a housing 5, wherein the housing 5 has an inner cavity 51, and the second stopper 6 is located in the inner cavity 51;

[0048] The second limiting member 6 includes a second main body portion 60, a portion of the second main body portion 60 is concave to form a limiting groove 61, the side wall corresponding to the limiting groove 61 is coaxially arranged with the screw rod 2, and the end of the screw rod 2 is located in the limiting groove 61. In this way, the end of the screw rod 2 is located in the limiting groove 61, which can prevent the screw rod 2 from shaking, so as to ensure its stability during rotation.

[0049] The second stopper 6 includes a circumferential matching portion 62, which is located at the outer periphery of the second main body 60 and connected to the second main body 60. In the radial direction, the circumferential stopper is interference-fitted with the wall corresponding to the inner cavity 51.

[0050] The circumferential matching portion 62 is provided with a flange portion 621, which is located at one end of the circumferential matching portion 62 facing away from the valve core assembly 1, and in the radial direction, the flange portion 621 is inclined toward the inside of the second main body portion 60. The circumferential matching portion 62 is provided with a flange portion 621 inclined toward the inside of the second main body portion 60, which is conducive to increasing the convenience of assembling the second limiter 6 and the housing 5.

[0051] The valve assembly also includes a rotor 8, which is located in the inner cavity 51; the rotor 8 includes a third main body portion 81 and a connecting portion 82, the inner diameter of the third main body portion 81 is larger than the outer diameter of the valve seat 3, the connecting portion 82 is connected to the third main body portion 81, and the connecting portion 82 is fixed to the screw rod 2.

[0052] In this way, the inner diameter of the third body portion 81 of the rotor 8 is larger than the outer diameter of the valve seat 3 , and an accommodation space is formed in the third body portion 81 of the rotor 8 to accommodate part of the valve seat 3 , so as to fully utilize the space and make the structure compact.

[0053] The valve assembly also includes a connecting seat 7 and a housing 5. A first limiting flange 71 protrudes from the end of the connecting seat 7. The inner diameter of the first limiting flange 71 is larger than the outer diameter of the housing 5. The first limiting flange 71 is at least partially sleeved on the housing 5. The first limiting flange 71 is welded and fixed to the housing 5. The connecting seat 7 has a second channel 72 that runs through its body. A portion of the valve seat 3 is located in the second channel 72. The valve seat 3 is fixed to the connecting seat 7, specifically, by welding. The inner diameter of the first limiting flange 71 is larger than the outer diameter of the housing 5, that is, the first limiting flange 71 is located outside the housing 5. In this way, the space inside the housing 5 is avoided from being occupied by the first limiting flange 71.

[0054] In some embodiments, the connecting seat 7 and the valve seat 3 are integrally provided.

[0055] During the process of the valve core assembly 1 moving axially downward, when the valve core body 10 is separated from the valve mouth portion 32 (that is, when the valve core body 10 is not in contact with the valve mouth portion 32), one end of the fitting 11 is in contact with the fixing member 13, and the other end of the fitting 11 is in contact with the spring; when the valve core body 10 is in contact with the valve mouth portion 32, but the rotor 8 drives the screw rod 2 to continue to rotate, the fitting 11 continues to move downward to compress or further compress the elastic member 12, and the first limiting portion 111 of the fitting 11 moves downward along the first matching groove 102 and the second matching groove 33 until the rotor 8 stops rotating or the first limiting portion 111 is in contact with the bottom wall corresponding to the second matching groove 33 in the axial direction, and the fitting 11 stops moving downward;

[0056] During the process of the valve core assembly 1 moving axially upward, the fitting 11 moves axially upward until the fitting 11 abuts against the fixing member 13, and the fitting 11 drives the valve core to move upward together to separate from the valve mouth portion 32; when the rotor 8 stops rotating or the valve core assembly 1 (specifically the fixing member 13) abuts against the bearing member 4, the valve core assembly 1 stops moving upward.

[0057] Figure 8-9 Another embodiment is shown. In this embodiment, the first step portion 22 abuts against the bearing member 4 in the axial direction, the connection matching portion 21 is provided with a first groove 210, and the connection matching portion 21 is sleeved with a first stopper 212. Part of the first stopper 212 is located in the first groove 210, and in the axial direction, the projection of the first stopper 212 is located on the bearing member 4, and the first stopper 212 abuts against the bearing member 4. In this way, the two sides of the bearing member 4 abut against the first stopper 212 and the first step portion 22, respectively, so as to limit the bearing member 4 in the axial direction and prevent it from moving in the axial direction. In this embodiment, the first stopper 212 is a retaining spring.

[0058] Fig.10 Another embodiment is shown, in which the housing 5 has a fourth main body 52, a guide portion 53 and a second limit groove 54, the fourth main body 52 is connected to the guide portion 53, and the guide portion 53 is connected to the second limit groove 54; along the axial direction and in the direction away from the valve seat, the outer diameter and the inner diameter of the guide portion 53 gradually decrease; the end of the screw rod 2 is at least partially located in the second limit groove 54. In this way, the second limit groove 54 limits the screw rod 2 to prevent the screw rod 2 from shaking when it rotates.

[0059] Figure 11-12 Another embodiment is shown, in which the valve assembly further comprises a third stopper 9; in the axial direction, the bearing member 4 is sleeved on the valve seat 3 and fixed or limitedly matched with the valve seat 3; the rotor 8 is provided with a second step portion 83, and in the axial direction, the second step portion 83 faces the valve seat 3; the rotor 8 is provided with a first stopper groove 84, and part of the third stopper 9 is located in the first stopper groove 84; in the axial direction, the bearing member 4 is located between the second step portion 83 and the third stopper 9, and part of the projection of the third stopper 9 is located in the second step portion 83. Specifically, the third stopper is a retaining spring.

[0060] Figure 13-14Another embodiment is shown. In this embodiment, the bearing member 4 is sleeved on the rotor 8 and fixed to the rotor 8; the shell 5 has an inner cavity 51, and the wall corresponding to the inner cavity 51 is provided with a fourth step portion 55, and part of the bearing member 4 is located on the fourth step portion 55; the bearing member 4 is at least partially located in the inner cavity 51, and is limitedly matched with the wall corresponding to the inner cavity 51 in the axial direction, specifically, part of the shell is sleeved outside the first limiting flange 71, and in the axial direction, the bearing member is located between the fourth step portion and the first limiting flange, and the two ends of the bearing member are respectively abutted against the fourth step portion and the first limiting flange, so that the bearing member is limited in the axial direction by the fourth step portion and the first limiting flange, that is, the movement of the rotor and the screw in the axial direction is limited; in some embodiments, part of the shell is sleeved in the first limiting flange 71, and the bearing member is fixed to the wall corresponding to the inner cavity, specifically by welding.

[0061] It should be noted that: although this specification has described the present application in detail with reference to the above-mentioned implementation methods, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify, combine or replace the present application with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A valve assembly, comprising a screw rod (2), a valve core assembly (1) and a valve seat (3), wherein the valve seat (3) has a first channel (31), the valve core assembly (1) is at least partially located in the first channel (31), the valve assembly has a valve opening (32), and the valve core assembly (1) is movable relative to the valve opening (32). It is characterized in that In the axial direction, the screw is stationary relative to the valve seat; One end of the screw rod (2) has a connecting fitting portion (21), the connecting fitting portion (21) is at least partially located in the valve core assembly, and the connecting fitting portion (21) is threadedly connected to the valve core assembly (1), the valve core assembly (1) and the wall corresponding to the first channel (31) are limitedly matched in the circumferential direction, and the valve core assembly (1) can move up and down in the axial direction along the connecting fitting portion (21).

2. A valve assembly according to claim 1, characterized in that: The valve core assembly (1) comprises a valve core body (10) and a matching piece (11), the valve core body (10) is provided with a receiving cavity (101), at least a portion of the matching piece (11) is located in the receiving cavity (101), at least a portion of the connecting matching portion (21) is located in the receiving cavity (101), and the matching piece (11) is threadedly matched with the connecting matching portion (21); The fitting (11) comprises a main body (110) and a first limiting portion (111), wherein the first limiting portion (111) at least partially protrudes from a side wall of the main body (110) in a radial direction; The first limiting portion (111) and the valve core body (10) are in limited cooperation in the circumferential direction, and the valve core body (10) and the valve seat (3) are in limited cooperation in the circumferential direction.

3. A valve assembly according to claim 2, characterized in that: A first matching groove (102) is provided on a wall corresponding to the accommodating cavity (101), and the first matching groove (102) extends downwardly from the opening of the accommodating cavity (101) along the axial direction; A second matching groove (33) is provided on a wall corresponding to the first channel (31), and the second matching groove (33) extends downwardly from an end of the valve seat (3) along an axial direction; A portion of the first limiting portion (111) is located in the first matching groove (102), the first limiting portion (111) is circumferentially limited with a wall corresponding to the first matching groove (102), and the first limiting portion (111) can move in an axial direction along the first matching groove (102); Part of the first limiting portion (111) is located in the second matching groove (33), the first limiting portion (111) and the second matching groove (33) are circumferentially limited, and the first limiting portion (111) can move in the axial direction along the second matching groove (33).

4. A valve assembly according to claim 3, characterized in that: In the axial direction, the distance between the first limiting portion (111) and the bottom wall corresponding to the first matching groove (102) is h, and the value of h is greater than zero; In the axial direction, the minimum distance between the wall corresponding to the first matching groove (102) and the valve opening (32) is a. The minimum distance between the wall corresponding to the second matching groove (33) and the valve mouth (32) is b, and the value of b is greater than the value of a.

5. A valve assembly according to claim 2, characterized in that: The valve core assembly (1) further comprises an elastic member (12), wherein the elastic member (12) is located in the accommodating cavity (101), and the elastic member (12) is located between the matching member (11) and the corresponding bottom wall of the accommodating cavity (101), and the two ends of the elastic member (12) are respectively in contact with the matching member (11) and the corresponding bottom wall of the accommodating cavity (101); The matching piece (11) comprises an extension portion (112), wherein the extension portion (112) extends downwardly from an end portion of the main body portion (110) along an axial direction, and a portion of the elastic piece (12) is sleeved on the extension portion (112).

6. A valve assembly according to claim 2, characterized in that: The valve core assembly (1) comprises a fixing member (13), the accommodating cavity (101) has a first opening (103), In the axial direction, the fixing member (13) is fixed or limited with a wall corresponding to the first opening (103); The fixing member (13) has a first through hole (131), the first through hole (131) passes through the body of the fixing member (13), a portion of the connecting and matching portion (21) is located in the first through hole (131), and a gap is left between the connecting and matching portion (21) and a wall corresponding to the first through hole (131); In the axial direction, the matching piece (11) is closer to the bottom wall corresponding to the accommodating cavity (101) than the fixing piece (13); The inner diameter of the first through hole (131) is smaller than the outer diameter of the fitting (11).

7. A valve assembly according to any one of claims 1 to 6, characterized in that: The valve assembly further comprises a bearing member, In the axial direction, the bearing piece is sleeved on the screw rod and is fixed or limitedly matched with the screw rod; The valve seat (3) has a first end (34) and a second end (35), the first end (34) faces the screw rod (2), and the second end (35) faces away from the screw rod (2), the first end (34) is provided with a limiting step portion (341), a part of the bearing component (4) is located on the limiting step portion (341), and the bearing component (4) is fixed to the limiting step portion (341).

8. A valve assembly according to claim 7, characterized in that: The screw rod (2) has a first main body (20), a first step portion (22) is provided between the first main body (20) and the connecting fitting portion (21), and the first step portion (22) is fixed to the bearing member (4), or The first step portion (22) abuts against the bearing component (4) in the axial direction, the connecting and fitting portion (21) is provided with a first groove (210), the connecting and fitting portion (21) is sleeved with a first limiting member (212), a portion of the first limiting member (212) is located in the first groove (210), and in the axial direction, the first limiting member (212) abuts against the bearing component (4).

9. A valve assembly according to any one of claims 1 to 6, characterized in that: The valve assembly further comprises a bearing member (4), a rotor (8) and a third stop member (9); the rotor (8) is fixed to the screw rod (2); In the axial direction, the bearing member (4) is sleeved on the valve seat (3) and is fixed or limitedly matched with the valve seat (3); The rotor (8) is provided with a second step portion (83), and in the axial direction, the second step portion (83) faces the valve seat (3); The rotor (8) is provided with a first limiting groove (84), and a portion of the third limiting member (9) is located in the first limiting groove (84); In the axial direction, the bearing member (4) is located between the second step portion (83) and the third limiting member (9), and a projected portion of the third limiting member (9) is located on the second step portion (83).

10. A valve assembly according to any one of claims 1 to 6, characterized in that: The valve assembly further comprises a bearing member (4), a rotor (8) and a housing (5), wherein the rotor (8) is fixed to the screw rod (2); The bearing member (4) is sleeved on the rotor (8) and fixed to the rotor (8); The housing (5) has an inner cavity (51), a wall corresponding to the inner cavity (51) is provided with a fourth step portion (55), and a portion of the bearing member (4) is located on the fourth step portion (55); The bearing member (4) is at least partially located in the inner cavity (51), and is fixed or positionally matched with a wall corresponding to the inner cavity (51) in the axial direction.

11. A valve assembly according to any one of claims 1 to 6, characterized in that: The valve assembly further comprises a second stopper (6) and a housing (5), wherein the housing (5) has an inner cavity (51), and the second stopper (6) is located in the inner cavity (51); The second limiting member (6) comprises a second main body (60), a portion of the second main body (60) is concave to form a limiting groove (61), a side wall corresponding to the limiting groove (61) is coaxially arranged with the screw rod (2), and an end of the screw rod (2) is located in the limiting groove (61); The second limiting member (6) comprises a circumferential matching portion (62), the circumferential matching portion (62) is connected to the second main body portion (60), and in the radial direction, the circumferential limiting portion is interference-fitted with a wall corresponding to the inner cavity (51); The circumferential fitting portion (62) is provided with a flange portion (621), and the flange portion (621) is located at an end of the circumferential fitting portion (62) facing away from the valve core assembly (1), and in the radial direction, the flange portion (621) is inclined toward the inside of the second main body portion (60).

12. A valve assembly according to any one of claims 1 to 6, characterized in that: The valve assembly further comprises a housing (5), the housing (5) comprising a fourth main body portion (52), a guide portion (53) and a second limiting groove portion (54), the fourth main body portion (52) being connected to the guide portion (53), and the guide portion (53) being connected to the second limiting groove portion (54); Along the axial direction and in the direction away from the valve seat (3), the outer diameter and the inner diameter of the guide portion (53) gradually decrease; The end of the screw rod (2) is at least partially located in the second limiting groove (54).

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