Electronic expansion valve

Abstract

The electronic expansion valve provided by the utility model includes a valve seat and a nut assembly, the valve seat has a valve port, the nut assembly includes a nut piece and an annular seat sleeved on the nut piece, the annular seat includes a first annular plate and a second annular plate connected with each other, one end of the first annular plate towards the valve port abuts against one side of the nut piece in the axial direction, the second annular plate extends at least towards the direction of the valve port of the first annular plate, the second annular plate is closer to the valve port relative to the first annular plate, and one end of the second annular plate towards the valve port is welded with the valve seat. By adopting the scheme, the problem that the connection between the valve body and the connecting plate still affects the nut assembly when the connecting plate is used to connect the valve body and the nut assembly in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and more specifically, to an electronic expansion valve. Background Technology

[0002] In existing electronic expansion valves, to avoid damage to both the nut assembly and the valve seat from direct connection, a connecting plate and guide sleeve are typically used to limit the nut assembly. Then, the valve seat and the connecting plate are connected, thereby achieving indirect connection between the valve seat and the nut assembly.

[0003] However, in the existing technology, the connecting plate is usually a flat plate. The distance between the position where it is used to limit the nut assembly and the position where it is used to connect with the valve seat is relatively close. This can easily lead to a situation where the connection between the connecting plate and the valve seat still affects the nut assembly. Utility Model Content

[0004] This invention provides an electronic expansion valve to solve the problem that in the prior art, when a connecting plate is used to transfer the valve body and the nut assembly, the connection between the valve body and the connecting plate can still easily affect the nut assembly.

[0005] To achieve the above objectives, this utility model provides an electronic expansion valve, which includes a valve seat and a nut assembly. The valve seat has a valve port, and the nut assembly includes a nut and an annular seat fitted on the nut. The annular seat includes a first annular plate and a second annular plate connected to each other. The end of the first annular plate facing the valve port abuts against one side of the nut in the axial direction. The second annular plate extends at least in the direction of the first annular plate facing the valve port. The second annular plate is closer to the valve port than the first annular plate. The end of the second annular plate facing the valve port is welded to the valve seat.

[0006] Furthermore, the end of the second annular plate is laser-welded to the valve seat.

[0007] Furthermore, the nut component includes a nut body and a mounting protrusion disposed on the outer periphery of the nut body near the valve port. The mounting protrusion has a top surface and a bottom surface disposed opposite each other in the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion is located on the side facing the valve port. The first annular plate abuts against the top surface of the mounting protrusion in the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion is spaced apart from the end of the second annular plate and the valve seat.

[0008] Furthermore, in the axial direction of the electronic expansion valve, the end of the second annular plate and the welding position of the valve seat are located between the bottom surface of the mounting protrusion and the bottom end of the nut body.

[0009] Furthermore, the nut body includes a nut segment, a transition segment, and a connecting segment connected in sequence. The outer diameter of the connecting segment is larger than the outer diameter of the nut segment. The mounting protrusion is provided on the outer periphery of the connecting segment. The inner ring of the second annular plate is spaced apart from the outer periphery of the connecting segment in the radial direction of the electronic expansion valve.

[0010] Furthermore, the nut body has a through positioning hole with a stop surface inside. The electronic expansion valve also includes a guide sleeve, which is disposed in the cavity of the valve seat. One end of the guide sleeve facing the first annular plate abuts against the other side of the nut component in the axial direction. One end of the guide sleeve passes through the positioning hole and abuts against the stop surface. The outer wall of the guide sleeve and the inner wall of the positioning hole are interference-fitted.

[0011] Furthermore, the first annular plate and the second annular plate are perpendicular to each other, and the second annular plate extends along the axial direction of the electronic expansion valve.

[0012] Furthermore, the nut assembly also includes a first limiting structure and a second limiting structure disposed between the nut body and the annular seat, the first limiting structure and the second limiting structure engaging to limit the relative rotation of the nut body and the annular seat.

[0013] Furthermore, the first limiting structure and the second limiting structure are provided in multiple sets; the first limiting structure includes an anti-rotation boss provided on the outer periphery of the nut body, and the second limiting structure includes a limiting groove provided on the inner ring of the first annular plate, the limiting groove being adapted to the anti-rotation boss.

[0014] Furthermore, the electronic expansion valve also includes a sleeve, a rotor assembly, a valve core assembly, a valve head assembly, and a guide plate. The sleeve is welded to the valve seat, the rotor assembly is disposed inside the sleeve, the nut assembly also includes a stop ring, the guide plate is disposed on the rotor assembly and abuts against the stop ring detachably, the valve head assembly is disposed inside the valve seat, the valve core assembly passes through the nut and the rotor assembly, and the valve core assembly is drively connected to the valve head assembly.

[0015] This solution divides the annular seat into a first annular plate for abutting the limiting nut and a second annular plate for connecting to the valve seat. Compared to the existing technology where both the functions for abutting the limiting nut and connecting to the valve seat are integrated on the connecting plate of the flat plate, this solution distributes the functions to the first and second annular plates. The first annular plate abuts and limits the nut assembly and connects the second annular plate to the valve seat. The extension of the second annular plate can achieve the spacing between its connection position with the valve seat and the first annular plate. This allows the connection position between the valve seat and the second annular plate to be as far apart from the nut as possible, reducing or avoiding situations where the nut may be affected during the connection process, thus improving the reliability and stability of the electronic expansion valve. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1A schematic diagram of the structure of the electronic expansion valve provided in an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 A partial structural diagram of an electronic expansion valve;

[0019] Figure 3 It shows Figure 1 A schematic diagram of the nut assembly in an electronic expansion valve;

[0020] Figure 4 It shows Figure 3 A schematic diagram of the nut component of the nut assembly;

[0021] Figure 5 It shows Figure 3 A sectional view;

[0022] Figure 6 It shows Figure 3 A cross-sectional view from another perspective.

[0023] The above figures include the following reference numerals:

[0024] 10. Valve seat; 11. Mating protrusion;

[0025] 20. Nut assembly; 21. Nut component; 211. Nut body; 21101. Locating hole; 21102. Stop surface; 2111. Nut section; 2112. Transition section; 2113. Connecting section; 2114. Anti-rotation boss; 212. Mounting protrusion; 22. Annular seat; 221. First annular plate; 222. Second annular plate; 23. Stop ring;

[0026] 30. Guide sleeve; 31. First guide sleeve; 32. Second guide sleeve;

[0027] 40. Rotor assembly;

[0028] 50. Valve core assembly; 51. Mandrel screw;

[0029] 60. Valve head assembly;

[0030] 70. Sleeve;

[0031] 80. Guide plate. Detailed Implementation

[0032] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0033] like Figures 1 to 6 As shown, this utility model provides an electronic expansion valve, which includes a valve seat 10 and a nut assembly 20. The valve seat 10 has a valve port, and the nut assembly 20 includes a nut 21 and an annular seat 22 sleeved on the nut 21. The annular seat 22 includes a first annular plate 221 and a second annular plate 222 connected to each other. The end of the first annular plate 221 facing the valve port abuts against one side of the nut 21 in the axial direction. The second annular plate 222 extends at least in the direction of the first annular plate 221 towards the valve port. The second annular plate 222 is closer to the valve port than the first annular plate 221. The end of the second annular plate 222 facing the valve port is welded to the valve seat 10.

[0034] In this embodiment, the annular seat 22 is divided into a first annular plate 221 for abutting the limiting nut 21 and a second annular plate 222 for connecting with the valve seat 10. Compared with the prior art, where the functions of abutting the limiting nut 21 and connecting with the valve seat 10 are both integrated on the connecting plate of the flat plate, this embodiment distributes the functions to the first annular plate 221 and the second annular plate 222. The first annular plate 221 abuts and limits the nut assembly and connects the second annular plate 222 with the valve seat 10. The extension of the second annular plate 222 can achieve the spacing between its connection position with the valve seat 10 and the first annular plate 221. This allows the connection position of the valve seat 10 with the second annular plate 222 to be as far apart from the nut 21 as possible, reducing or avoiding situations where the nut 21 may be affected during the connection process, thus improving the reliability and stability of the electronic expansion valve.

[0035] It should be noted that the annular seat 22 and the nut 21 are in a clearance fit in the radial direction of the electronic expansion valve, so as to restrict the relative position of the two in the radial direction and facilitate their assembly.

[0036] In this embodiment, the first annular plate 221 and the second annular plate 222 are perpendicular to each other, and the second annular plate 222 extends along the axial direction of the electronic expansion valve. It can be understood that in this embodiment, the first annular plate 221 is a flat plate with the axis of the electronic expansion valve perpendicular to its surface, and the second annular plate 222 is an annular cylindrical plate with the axis of the electronic expansion valve parallel to its surface. The perpendicular arrangement of the first annular plate 221 and the second annular plate 222 forms a stable support frame, which helps ensure the stability and positioning accuracy of the nut assembly 20 inside the electronic expansion valve, thus ensuring the reliability and stability of the electronic expansion valve. Furthermore, the perpendicular arrangement of the first annular plate 221 and the second annular plate 222 also facilitates the machining of the annular seat 22.

[0037] It is understood that the extension of the first annular plate 221 and the angle formed by the second annular plate 222 can be adaptively adjusted according to the actual situation, and are not limited to being perpendicular to each other in this embodiment.

[0038] In some embodiments, the first annular plate 221 and the second annular plate 222 are integrally formed. Alternatively, the size and shape of the first annular plate 221 and the second annular plate 222 can be adjusted to adapt to the design requirements of different electronic expansion valves and solve problems such as the positioning, support, and connection of the nut assembly 20.

[0039] like Figures 4 to 6 As shown, the nut component 21 includes a nut body 211 and a mounting protrusion 212 disposed on the outer periphery of the nut body 211 near the valve port. The mounting protrusion 212 has a top surface and a bottom surface disposed opposite each other in the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion 212 is located on the side facing the valve port. The top surface of the first annular plate 221 abuts against the top surface of the mounting protrusion 212 in the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion 212 is spaced apart from the end of the second annular plate 222 and the valve seat 10.

[0040] Furthermore, the first annular plate 221 abuts against the top surface of the mounting protrusion 212 and is limited to the outer periphery of the nut body 211, and the second annular plate 222 is limited to the outer periphery of the mounting protrusion 212.

[0041] In this embodiment, the mounting protrusion 212 is disposed on the outer periphery of the nut body 211, which can be understood as a protruding structure designed to cooperate with the annular seat 22. The contact between the top surface of the first annular plate 221 and the mounting protrusion 212 facilitates the installation and positioning of the annular seat 22 and the nut 21. At the same time, the limiting cooperation between the first annular plate 221 and the outer periphery of the nut body 211, as well as the limiting cooperation between the second annular plate 222 and the outer periphery of the mounting protrusion 212, restricts the relative position and coaxiality of the annular seat 22 and the nut 21, ensuring the reliability of the installation. On the other hand, the spacing between the bottom surface of the mounting protrusion 212 and the end of the second annular plate 222 and the welding position of the valve seat 10 allows the connection position of the valve seat 10 and the second annular plate 222 to be as far apart from the nut body 211 as possible (there is a certain distance between the inner side of the connection position and the outer periphery of the nut body 211 and the bottom surface of the mounting protrusion 212), reducing or avoiding situations that may affect the nut 21 during the connection process, thereby improving the reliability and stability of the electronic expansion valve.

[0042] like Figure 1 and Figure 2 As shown, in the axial direction of the electronic expansion valve, the end of the second annular plate 222 and the welding position of the valve seat 10 are located between the bottom surface of the mounting protrusion 212 and the bottom end of the nut body 211. This arrangement ensures that the connection position will not affect the nut 21, while avoiding situations where the extension length of the second annular plate 222 is too long and affects the structural layout design.

[0043] Preferably, the end of the second annular plate 222 (the end of the second annular plate 222 facing the guide sleeve 30) is laser-welded to the valve seat 10. Laser welding ensures the precision and strength of the connection, enhancing not only the connection strength between the nut assembly 20 and the valve seat 10 but also ensuring the sealing of the welded area and improving the reliability of the electronic expansion valve. Furthermore, by extending the second annular plate 222, the welding position between the second annular plate 222 and the valve seat 10 can be spaced from the first annular plate 221, preventing the high heat generated during welding from burning the nut component 21 and ensuring the structural strength of the nut assembly 20.

[0044] Specifically, the nut body 211 includes a nut segment 2111, a transition segment 2112, and a connecting segment 2113 connected in sequence. The outer diameter of the connecting segment 2113 is larger than the outer diameter of the nut segment 2111. The mounting protrusion 212 is disposed on the outer periphery of the connecting segment 2113. The inner ring of the second annular plate 222 is radially spaced from the outer periphery of the connecting segment 2113. This arrangement ensures that, while guaranteeing the reliability of the limiting installation of the nut body 211 and the annular seat 22, a certain distance is maintained between the end of the second annular plate 222 and the outer periphery of the connecting segment 2113, as well as the bottom of the mounting protrusion 212, to avoid affecting the nut body 211 when it is connected to the valve seat 10.

[0045] like Figure 5 and Figure 6 As shown, the nut body 211 has a through positioning hole 21101, and a stop surface 21102 is provided inside the positioning hole 21101. The electronic expansion valve also includes a guide sleeve 30, which is disposed in the cavity of the valve seat 10. One end of the guide sleeve 30 facing the first annular plate 221 abuts against the other side of the nut 21 in the axial direction. One end of the guide sleeve 30 passes through the positioning hole 21101 and abuts against the stop surface 21102. The outer wall of the guide sleeve 30 and the inner wall of the positioning hole 21101 are press-fitted. This configuration ensures the coaxiality of the guide sleeve 30 and the nut body 211 and the stability of their connection through the press-fit. The abutment between the guide sleeve 30 and the stop surface 21102 and the abutment between the first annular plate 221 and the mounting protrusion 212 achieve the positioning of the nut body 211 in the axial direction, preventing it from moving and affecting the functionality and structural stability of the electronic expansion valve. On the other hand, the guide sleeve 30 radially positions the nut body 211. Combined with the radial clearance fit between the first annular plate 221 of the annular seat 22 and the nut body 211, the radial positioning of the nut body 211 is achieved, while avoiding interference between the annular seat 22 and the radial positioning of the nut body 211.

[0046] The nut assembly 20 further includes a first limiting structure and a second limiting structure disposed between the nut body 211 and the annular seat 22. The first limiting structure and the second limiting structure cooperate to limit the relative rotation of the nut body 211 and the annular seat 22. This arrangement, through the cooperation of the first limiting structure and the second limiting structure, effectively prevents the relative rotation of the nut assembly 20 during operation, thereby improving the control accuracy and operational stability of the electronic expansion valve.

[0047] Specifically, such as Figure 3 , Figure 4 and Figure 6As shown, multiple sets of the first and second limiting structures are provided to enhance the limiting and anti-rotation effects. The first limiting structure includes an anti-rotation boss 2114 located on the outer periphery of the nut body 211 (outer periphery of the connecting section 2113). The second limiting structure includes a limiting groove located on the inner ring of the first annular plate 221. The limiting groove is adapted to the anti-rotation boss 2114. The anti-rotation effect is achieved by the cooperation of the limiting groove and the anti-rotation boss 2114, which facilitates processing and is also beneficial for assembly and positioning. In this embodiment, the anti-rotation boss 2114 passes through the mounting protrusion 212 along the axial direction of the nut part 21.

[0048] like Figure 1 As shown, the electronic expansion valve also includes a sleeve 70, a rotor assembly 40, a valve core assembly 50, a valve head assembly 60, and a guide plate 80. The sleeve 70 is welded to the valve seat 10. The rotor assembly 40 is disposed inside the sleeve 70. The nut assembly 20 also includes a stop ring 23. The guide plate 80 is disposed on the rotor assembly 40 and abuts against the stop ring 23 detachably. The valve head assembly 60 is disposed inside the valve seat 10. The valve core assembly 50 passes through the nut 21 and the rotor assembly 40. The valve core assembly 50 is drively connected to the valve head assembly 60.

[0049] In this embodiment, the end of the valve seat 10 has an annular mating protrusion 11. The inner and outer sides of the mating protrusion 11 form a first step and a second step, respectively. The inner first step is welded to the end of the second annular plate 222, and the outer second step is welded to the end of the sleeve 70. In this embodiment, the end of the second annular plate 222 is spaced from the bottom surface of the first step, and the outer side of the end of the second annular plate 222 is clearance-fitted with the side surface of the first step. The second annular plate 222 is laser-welded to the second step position. The end of the sleeve 70 is limited to the second step and connected and sealed by laser welding. It can be understood that the axial extension of the second annular plate 222 not only achieves the spacing between its welding position with the valve seat 10 and the nut 21, but also achieves the spacing between its welding position with the sleeve 70 and the nut 21, further ensuring the reliability of the welding.

[0050] The guide sleeve 30 includes a first guide sleeve 31 and a second guide sleeve 32. The first guide sleeve 31 is fitted around the outer periphery of the second guide sleeve 32 and is installed inside the valve seat 10. The second guide sleeve 32 is used for limiting and abutting with the nut 21, and also for limiting the installation of the valve head assembly 60. The valve core assembly 50 includes a spindle screw 51, which passes through the nut 21 and the rotor assembly 40.

[0051] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0052] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0055] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. An electronic expansion valve characterized by, The electronic expansion valve includes a valve seat (10) and a nut assembly (20). The valve seat (10) has a valve port. The nut assembly (20) includes a nut (21) and an annular seat (22) sleeved on the nut (21). The annular seat (22) includes a first annular plate (221) and a second annular plate (222) connected to each other. The end of the first annular plate (221) facing the valve port abuts against one side of the nut (21) in the axial direction. The second annular plate (222) extends at least in the direction of the first annular plate (221) towards the valve port. The second annular plate (222) is close to the valve port relative to the first annular plate (221). The end of the second annular plate (222) facing the valve port is welded to the valve seat (10).

2. The electronic expansion valve according to claim 1, characterized in that, The end of the second annular plate (222) is laser welded to the valve seat (10).

3. The electronic expansion valve according to claim 1, characterized in that, The nut component (21) includes a nut body (211) and a mounting protrusion (212) disposed on the outer periphery of the nut body (211) near the valve port. The mounting protrusion (212) has a top surface and a bottom surface disposed opposite to each other in the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion (212) is located on the side facing the valve port. The top surface of the first annular plate (221) and the mounting protrusion (212) abut against the axial direction of the electronic expansion valve. The bottom surface of the mounting protrusion (212) is spaced apart from the end of the second annular plate (222) and the valve seat (10).

4. The electronic expansion valve according to claim 3, characterized in that, In the axial direction of the electronic expansion valve, the end of the second annular plate (222) and the welding position of the valve seat (10) are located between the bottom surface of the mounting protrusion (212) and the bottom end of the nut body (211).

5. The electronic expansion valve according to claim 3, characterized in that, The nut body (211) includes a nut segment (2111), a transition segment (2112), and a connecting segment (2113) connected in sequence. The outer diameter of the connecting segment (2113) is larger than the outer diameter of the nut segment (2111). The mounting protrusion (212) is disposed on the outer periphery of the connecting segment (2113). The inner ring of the second annular plate (222) is radially spaced from the outer periphery of the connecting segment (2113) in the electronic expansion valve.

6. The electronic expansion valve according to claim 3, characterized in that, The nut body (211) has a through positioning hole (21101), and the positioning hole (21101) has a stop surface (21102). The electronic expansion valve also includes a guide sleeve (30), which is disposed in the cavity of the valve seat (10). One end of the guide sleeve (30) facing the first annular plate (221) abuts against the other side of the nut (21) in the axial direction. One end of the guide sleeve (30) passes through the positioning hole (21101) and abuts against the stop surface (21102). The outer wall of the guide sleeve (30) and the inner wall of the positioning hole (21101) are interference-fitted.

7. The electronic expansion valve according to claim 1, characterized in that, The first annular plate (221) and the second annular plate (222) are perpendicular to each other, and the second annular plate (222) extends along the axial direction of the electronic expansion valve.

8. The electronic expansion valve according to claim 3, characterized in that, The nut assembly (20) further includes a first limiting structure and a second limiting structure disposed between the nut body (211) and the annular seat (22). The first limiting structure and the second limiting structure cooperate to limit the relative rotation of the nut body (211) and the annular seat (22).

9. The electronic expansion valve according to claim 8, characterized in that, The first limiting structure and the second limiting structure are provided in multiple sets; The first limiting structure includes an anti-rotation boss (2114) disposed on the outer periphery of the nut body (211), and the second limiting structure includes a limiting groove disposed on the inner ring of the first annular plate (221), the limiting groove being adapted to the anti-rotation boss (2114).

10. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a sleeve (70), a rotor assembly (40), a valve core assembly (50), a valve head assembly (60), and a guide plate (80). The sleeve (70) is welded to the valve seat (10). The rotor assembly (40) is disposed inside the sleeve (70). The nut assembly (20) further includes a stop ring (23). The guide plate (80) is disposed on the rotor assembly (40) and separably abuts against the stop ring (23). The valve head assembly (60) is disposed inside the valve seat (10). The valve core assembly (50) passes through the nut (21) and the rotor assembly (40). The valve core assembly (50) is drively connected to the valve head assembly (60).

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