Nut assembly and electronic expansion valve

Abstract

The application provides a nut assembly and an electronic expansion valve, and the nut assembly comprises: a nut body, the nut body is provided with an internal thread, and the outer circumferential surface of the nut body is provided with a spiral guide groove; a stop ring, the stop ring is arranged on the spiral guide groove, and the stop ring is rotatably arranged along the spiral guide groove; a first limiting structure, the first limiting structure is arranged on the nut body, the first limiting structure is provided with a first stop surface protruding from the outer circumferential surface of the nut body, and the stop ring and the first stop surface are in stop cooperation; a second limiting structure, the second limiting structure is arranged on the nut body, the second limiting structure is provided with a second stop surface protruding from the outer circumferential surface of the nut body, and the stop ring and the second stop surface are in stop cooperation; wherein the spiral guide groove is located between the first limiting structure and the second limiting structure. By adopting the scheme, the stop position between the stop ring and the first stop surface and the second stop surface is prevented from being located in the spiral guide groove or on the extension line of the spiral guide groove, and the reliability of the movement of the stop ring is ensured.

Description

Technical Field

[0001] This invention relates to the field of electronic expansion valve technology, and more specifically, to a nut assembly and an electronic expansion valve. Background Technology

[0002] Currently, in existing nut assemblies, the nut body and connecting plate are insert structures, and a spiral guide groove is formed between the limiting spring and the outer circumferential surface of the nut body. However, due to limitations in processing technology, the two ends of the stop ring are prone to sharp edges and burrs. When the stop ring collides with the first or second limiting structure, it can easily damage the first and second limiting structures, causing fine powder to be ejected. This powder can then enter the spiral guide groove, causing the stop ring to jam. Summary of the Invention

[0003] This invention provides a nut assembly and an electronic expansion valve to solve the problem of easy jamming of the stop ring after impact in the prior art.

[0004] To address the aforementioned problems, according to one aspect of the present invention, a nut assembly is provided, comprising: a nut body having an internal thread and a helical guide groove on its outer peripheral surface; a stop ring disposed on the helical guide groove and rotatably disposed along the helical guide groove; a first limiting structure disposed on the nut body and having a first stop surface protruding from the outer peripheral surface of the nut body, wherein the stop ring and the first stop surface engage in a stop-stop engagement; and a second limiting structure disposed on the nut body and having a second stop surface protruding from the outer peripheral surface of the nut body, wherein the stop ring and the second stop surface engage in a stop-stop engagement; wherein the helical guide groove is located between the first limiting structure and the second limiting structure.

[0005] Furthermore, the stop ring includes a spiral component and a first hook and a second hook respectively disposed at both ends of the spiral component. The spiral component is located in the spiral guide groove. The first hook cooperates with the first limiting structure stop, and the second hook cooperates with the second limiting structure stop.

[0006] Furthermore, the first hook extends away from the outer circumference of the nut body, and the second hook is located on the side of the screw component facing the second limiting structure, extending along the axial direction of the nut body.

[0007] Furthermore, the second limiting structure is a limiting block, and the second stop surface is located on the outer wall of the limiting block, with the stop ring and the outer wall of the limiting block providing a stop fit.

[0008] Furthermore, the first limiting structure is a limiting ring, and the first stop surface is located on the limiting ring, with the first stop surface and the limiting ring engaging.

[0009] Furthermore, the limiting ring includes an arc-shaped component and a third hook disposed at one end of the arc-shaped component. The third hook is located on the side of the arc-shaped component facing the stop ring and extends in a direction away from the outer peripheral surface of the nut body. The first stop surface is located on the outer side wall of the third hook, and the outer side wall of the first hook and the first stop surface stop and cooperate.

[0010] Furthermore, the limiting ring also includes a fourth hook disposed at the other end of the arc-shaped component. The fourth hook is located on the side of the arc-shaped component away from the stop ring. The outer circumferential surface of the nut body has a mating groove, and the arc-shaped component and / or the fourth hook are limited and mated with the mating groove.

[0011] Furthermore, the nut assembly also includes a connecting plate and a limiting plate connected to the nut body. The radial dimension of the limiting plate is larger than the radial dimension of the nut body. The connecting plate is detachably fitted onto the nut body, and the connecting plate and the limiting plate abut against each other.

[0012] According to another aspect of the present invention, an electronic expansion valve is provided, comprising a valve body assembly, a rotor assembly, and the aforementioned nut assembly, wherein the nut assembly is disposed within a cavity of the valve body assembly; the rotor assembly comprises a rotor connecting plate, a guide plate, and a cylindrical magnetic rotor, wherein the magnetic rotor is movably disposed within a cavity of the valve body assembly, the rotor connecting plate is located within a cavity of the magnetic rotor and is fixedly connected to the magnetic rotor, the guide plate is located within a cavity of the magnetic rotor and is fixedly connected to the rotor connecting plate, and the guide plate and a stop ring of the nut assembly are engaged for limiting cooperation.

[0013] Furthermore, the valve body assembly includes a valve cover and a valve seat that are interconnected. The stop ring, the first limiting structure, and the second limiting structure are all located in the cavity of the valve cover. A part of the nut body is located in the cavity of the valve seat, and another part of the nut body is located in the cavity of the valve cover. The connecting plate of the nut assembly and the valve seat are welded together.

[0014] The present invention provides a nut assembly comprising: a nut body having an internal thread and a helical guide groove on its outer circumferential surface; a stop ring disposed on the helical guide groove and rotatably disposed along the helical guide groove; a first limiting structure disposed on the nut body and having a first stop surface protruding from the outer circumferential surface of the nut body, wherein the stop ring and the first stop surface are in a stop-stop engagement; and a second limiting structure disposed on the nut body and having a second stop surface protruding from the outer circumferential surface of the nut body, wherein the stop ring and the second stop surface are in a stop-stop engagement; wherein the helical guide groove is located between the first limiting structure and the second limiting structure. This design incorporates a first stop surface and a second stop surface protruding from the outer circumference of the nut body. The stop ring engages with these surfaces, ensuring that the stopping positions between the stop ring and the first stop surface, as well as between the stop ring and the second stop surface, protrude from the spiral guide groove. This avoids the situation in existing technologies where the stopping positions between the stop ring and the first stop surface, and between the stop ring and the second stop surface, are located within the spiral guide groove or on its extension line. It also prevents powder or other debris from entering the spiral guide groove after impact, thus preventing the stop ring from jamming and ensuring reliable movement. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 A schematic diagram of the nut assembly provided in an embodiment of the present invention is shown;

[0017] Figure 2 It shows Figure 1 Exploded view of the nut assembly;

[0018] Figure 3 It shows Figure 1 A schematic diagram of the structure in which the stop ring and the second limiting structure abut in the nut assembly;

[0019] Figure 4 It shows Figure 1 A schematic diagram of the structure in which the stop ring and the first limiting structure abut in the nut assembly;

[0020] Figure 5 A schematic diagram of the structure of an electronic expansion valve provided in another embodiment of the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Nut body; 11. Spiral guide groove; 12. Mating groove; 13. Limiting block; 14. Guide slope; 15. Demolding groove;

[0023] 20. Stop ring; 21. Spiral component; 22. First hook; 23. Second hook;

[0024] 30. First limiting structure; 31. First stop surface; 32. Arc-shaped component; 33. Third hook; 34. Fourth hook;

[0025] 40. Second limiting structure; 41. Second stop surface;

[0026] 50. Connecting plate; 51. Limiting groove; 52. Balancing groove;

[0027] 60. Limit plate;

[0028] 70. Valve body assembly; 71. Valve cover; 72. Valve seat; 721. Guide sleeve;

[0029] 80. Rotor assembly; 81. Rotor connecting plate; 82. Guide plate; 83. Magnetic rotor;

[0030] 90. Valve needle assembly. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 4 As shown, an embodiment of the present invention provides a nut assembly, including: a nut body 10, the nut body 10 having an internal thread, and a helical guide groove 11 on the outer peripheral surface of the nut body 10; a stop ring 20, the stop ring 20 being disposed on the helical guide groove 11 and rotatably disposed along the helical guide groove 11; a first limiting structure 30, the first limiting structure 30 being disposed on the nut body 10, the first limiting structure 30 having a first stop surface 31 protruding from the outer peripheral surface of the nut body 10, the stop ring 20 and the first stop surface 31 engaging in a stop-stop engagement; and a second limiting structure 40, the second limiting structure 40 being disposed on the nut body 10, the second limiting structure 40 having a second stop surface 41 protruding from the outer peripheral surface of the nut body 10, the stop ring 20 and the second stop surface 41 engaging in a stop-stop engagement; wherein, the helical guide groove 11 is located between the first limiting structure 30 and the second limiting structure 40.

[0033] In this embodiment, by providing a first stop surface 31 and a second stop surface 41 protruding from the outer circumference of the nut body 10, and by having the stop ring 20 stop and engage with the first stop surface 31 and the second stop surface 41 respectively, the stopping positions between the stop ring 20 and the first stop surface 31, and between the stop ring 20 and the second stop surface 41, protrude from the spiral guide groove 11. This avoids the situation in the prior art where the stopping positions between the stop ring 20 and the first stop surface 31, and between the stop ring 20 and the second stop surface 41, are located inside the spiral guide groove 11 or on the extension line of the spiral guide groove 11. This prevents the stop ring 20 from getting stuck due to powder or other particles entering the spiral guide groove 11 after a stop impact, thus ensuring the reliability of the movement of the stop ring 20.

[0034] Specifically, the first limiting structure 30 and the second limiting structure 40 respectively limit the stop ring 20 in two directions along the axis of the nut body 10. Both the first stop surface 31 and the second stop surface 41 are positioned to avoid the spiral guide groove 11 or its extension. This arrangement ensures that the stopping positions of the stop ring 20 and the first stop surface 31, as well as the stopping positions of the stop ring 20 and the second stop surface 41, are not within the spiral guide groove 11 or its extension. This prevents powder or other debris from entering the spiral guide groove 11 after a stop impact, thus preventing the stop ring 20 from jamming and ensuring the reliability of its movement.

[0035] Optionally, the outer circumferential surface of the nut body 10 has two opposing demolding planes, which are parallel to the axis of the nut body 10. A spiral guide groove 11 is disposed on the outer circumferential surface of the nut body 10 located between the two demolding planes, and the maximum distance between the two demolding planes is less than the minimum diameter of the spiral guide groove 11. This arrangement avoids the situation in the prior art where part of the mold line generated after the nut body is molded falls on the spiral guide groove, thus affecting the movement of the stop ring within the spiral guide groove, thereby improving the reliability of the nut body 10.

[0036] like Figure 2 As shown, the stop ring 20 includes a spiral member 21 and a first hook 22 and a second hook 23 respectively disposed at both ends of the spiral member 21. The spiral member 21 is located in the spiral guide groove 11. The first hook 22 and the first limiting structure 30 stop and cooperate, and the second hook 23 and the second limiting structure 40 stop and cooperate.

[0037] In this embodiment, by setting the first hook 22 and the second hook 23, the two ends of the stop ring in the prior art are changed into two hook stops, which increases the stop area and ensures that no powder is generated or less is generated during the stop impact process, thus ensuring the performance of the nut assembly.

[0038] Specifically, the first hook 22 extends away from the outer circumference of the nut body 10, and the second hook 23 is located on the side of the spiral member 21 facing the second limiting structure 40, extending along the axis of the nut body 10. In this embodiment, the first hook 22 is arranged perpendicular to the axis of the nut body 10, and the second hook 23 is arranged at an angle. This arrangement facilitates the protrusion of the stop position of the stop ring 20 out of the spiral guide groove 11.

[0039] Optionally, the axis of the second hook 23 is parallel to the second stop surface 41.

[0040] like Figure 3 As shown, the second limiting structure 40 is a limiting block, the second stop surface 41 is located on the outer wall of the limiting block, and the stop ring 20 and the outer wall of the limiting block stop together.

[0041] In this embodiment, the second hook 23 extends obliquely along the axial direction of the nut body 10, so that the second hook 23 protrudes from the spiral guide groove 11, ensuring that the second hook 23 can stop and cooperate with the second stop surface 41 protruding from the spiral guide groove 11, thus ensuring the performance of the nut assembly.

[0042] like Figure 4 As shown, the first limiting structure 30 is a limiting ring, and the first stop surface 31 is located on the limiting ring, with the first stop surface 31 and the limiting ring engaging in a stop-stop cooperation.

[0043] In this embodiment, by setting the first limiting structure 30 as a limiting ring, the stop ring 20 can be assembled onto the nut body 10 first, and then the limiting ring can be installed. This avoids the problem in the prior art where the nut body and the limiting structure are an integral structure, causing the stop ring and the limiting spring to be blocked during the assembly of the nut body. This setting facilitates the automated installation of the stop ring 20 and the nut body 10, and further improves the production efficiency of the nut assembly.

[0044] Optionally, the second stop surface 41 is parallel to the axis of the nut body 10.

[0045] Specifically, the limiting ring includes an arc-shaped component 32 and a third hook 33 disposed at one end of the arc-shaped component 32. The third hook 33 is located on the side of the arc-shaped component 32 facing the stop ring 20, and extends in a direction away from the outer circumference of the nut body 10. The first stop surface 31 is located on the outer wall of the third hook 33, and the outer wall of the first hook 22 and the first stop surface 31 engage in a stop-stop engagement. This arrangement ensures that the third hook 33 protrudes from the spiral guide groove 11, guaranteeing the stop-stop engagement between the first hook 22 and the first stop surface 31. This avoids the direct stop between the spiral component 21 of the stop ring 20 and the arc-shaped component 32 of the limiting ring in the prior art, thus ensuring the performance of the nut assembly.

[0046] Furthermore, the limiting ring also includes a fourth hook 34 located at the other end of the arc-shaped member 32. The fourth hook 34 is located on the side of the arc-shaped member 32 away from the stop ring 20. The outer circumferential surface of the nut body 10 has a mating groove 12, and the arc-shaped member 32 and / or the fourth hook 34 are engaged with the mating groove 12 for limiting. In this configuration, the movement of the limiting ring along the axial direction of the nut body 10 and the rotation along the radial direction of the nut body 10 are restricted by the limiting engagement between the arc-shaped member 32 and / or the fourth hook 34 and the mating groove 12, ensuring the stability and reliability of the fixed connection between the limiting ring and the nut body 10.

[0047] Optionally, the mating groove 12 includes a first groove and a second groove. The first groove is an arc-shaped groove that extends circumferentially along the nut body 10. The second groove extends axially along the nut body 10. The arc-shaped part 32 engages with the first groove, and the fourth hook 34 engages with the second groove.

[0048] Optionally, one end of the nut body 10 has a guide slope 14 for guiding the assembly of the stop ring 20 and the limit ring. The end of the nut body 10 with the mating groove 12 also has a demolding groove 15 to facilitate demolding of the nut body 10 after molding.

[0049] like Figure 2 As shown, the nut assembly also includes a connecting plate 50 and a limiting plate 60 connected to the nut body 10. The radial dimension of the limiting plate 60 is larger than the radial dimension of the nut body 10. The connecting plate 50 is detachably sleeved on the nut body 10, and the connecting plate 50 and the limiting plate 60 abut against each other.

[0050] In this embodiment, the nut body 10 and the connecting plate 50 of the nut assembly are set separately, so that the connecting plate 50 can be detachably sleeved on the outer peripheral surface of the nut body 10 and abut against the limiting plate 60. This avoids the situation in the prior art where a connecting plate needs to be inserted when the nut assembly is injection molded as an insert. This allows the nut body 10 and the connecting plate 50 to be processed and formed independently and then combined together. At the same time, it avoids the situation where the nut body with the connecting plate cannot be reused, so that the nut body 10 can be reused more effectively and the production efficiency of the nut assembly can be improved.

[0051] Optionally, the first limiting structure 30 and the second limiting structure 40 are clearance-fitted radially in the connecting plate 50, and interference-fitted circumferentially in the connecting plate 50. This configuration allows the connecting plate 50 on the nut body 10 to move radially but not circumferentially, avoiding the radial over-positioning of the nut body during the installation of the nut assembly into the valve body assembly 70 in related technologies, where the connecting plate and valve body assembly are also tightly fitted. This prevents the nut assembly from being over-positioned radially, compromising coaxiality between the nut assembly and the valve body assembly 70. This improves the coaxiality of the nut assembly and the valve body assembly 70, and reduces the machining accuracy and cost of the nut assembly.

[0052] Optionally, the nut body 10 also includes a plurality of limiting blocks 13, which are disposed on the nut body 10 and the limiting plate 60, and are arranged around the nut body 10. The connecting plate 50 has a plurality of limiting grooves 51, and the plurality of limiting grooves 51 and the plurality of limiting blocks 13 are engaged in a one-to-one manner.

[0053] like Figure 5 As shown, another embodiment of the present invention provides an electronic expansion valve, which includes a valve body assembly 70, a rotor assembly 80, and the aforementioned nut assembly. The nut assembly is disposed within the cavity of the valve body assembly 70. The rotor assembly 80 includes a rotor connecting plate 81, a guide plate 82, and a cylindrical magnetic rotor 83. The magnetic rotor 83 is movably disposed within the cavity of the valve body assembly 70. The rotor connecting plate 81 is located within the cavity of the magnetic rotor 83 and is fixedly connected to the magnetic rotor 83. The guide plate 82 is located within the cavity of the magnetic rotor 83 and is fixedly connected to the rotor connecting plate 81. The guide plate 82 and the stop ring 20 of the nut assembly are mutually limitingly engaged.

[0054] In this embodiment, through the limiting cooperation of the stop ring 20 and the guide plate 82, the stop ring 20 abuts against the guide plate 82 during rotation, driving the guide plate 82 to rotate and move along the axial direction of the nut body 10. Specifically, there is a gap between the guide plate 82 and the inner wall of the cavity of the magnetic rotor 83 to avoid friction between the guide plate 82 and the cavity of the magnetic rotor 83 during rotation. This design avoids the need for laser welding between the rotor connecting plate and the guide plate in the prior art, which is prone to defects such as blackening and cracking after welding, thus ensuring the reliability of the rotor assembly 80.

[0055] Optionally, the electronic expansion valve also includes a valve needle assembly 90, the screw and guide plate 82 of the valve needle assembly 90 are welded together, and the rotor connecting plate 81 is made of Pps. The Pps rotor connecting plate has better heat insulation performance and can prevent the magnetic rotor 83 from cracking when the guide plate 82 and the screw of the valve needle assembly 90 are welded together.

[0056] Specifically, the valve body assembly 70 includes a valve cover 71 and a valve seat 72 connected to each other. The stop ring 20, the first limiting structure 30 and the second limiting structure 40 are both located in the cavity of the valve cover 71. A part of the nut body 10 is located in the cavity of the valve seat 72, and another part of the nut body 10 is located in the cavity of the valve cover 71. The connecting plate 50 of the nut assembly is welded to the valve seat 72.

[0057] Optionally, the valve body assembly 70 also includes a guide sleeve 721, which is disposed in the cavity of the valve seat 72. The nut body 10 of the nut assembly has a mounting hole with a positioning step inside. The guide sleeve 721 abuts against the positioning step, and the outer peripheral surface of the guide sleeve 721 and the inner sidewall of the mounting hole are in a limiting fit.

[0058] The installation process of the electronic expansion valve is as follows: First, install the connected valve needle assembly 90 and nut assembly together with the valve seat 72, so that the inner side wall of the nut mounting hole and the outer side wall of the guide sleeve 721 are in a limiting fit. Then, put the connecting plate 50 on the nut body 10 and apply a force towards the limiting plate 60 to the connecting plate 50, so that the connecting plate 50 and the limiting plate 60 abut together, and drive the entire nut assembly to move into the cavity of the valve seat 72 until the positioning step and one end of the guide sleeve 721 abut together. At this time, a step is formed between the connecting plate 50 and the side wall of the valve seat 72. Weld at the connection position of the connecting plate 50 and the valve seat 72. Then, fix the rotor assembly 80 and the valve needle assembly 90 together. Finally, fix the valve cover 71 and the valve seat 72 together to complete the installation of the electronic expansion valve.

[0059] Optionally, the connecting plate 50 also has multiple balancing grooves 52, through which the cavity of the valve seat 72 and the cavity of the valve cover 71 are connected.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A nut assembly, characterized in that, include: Nut body (10), the nut body (10) has internal thread, and the outer peripheral surface of the nut body (10) has a spiral guide groove (11). A stop ring (20) is disposed on the spiral guide groove (11) and is rotatably disposed along the spiral guide groove (11); The first limiting structure (30) is disposed on the nut body (10). The first limiting structure (30) has a first stop surface (31) protruding from the outer peripheral surface of the nut body (10). The stop ring (20) and the first stop surface (31) are in stop cooperation. The second limiting structure (40) is disposed on the nut body (10). The second limiting structure (40) has a second stop surface (41) protruding from the outer peripheral surface of the nut body (10). The stop ring (20) and the second stop surface (41) are in stop engagement. The spiral guide groove (11) is located between the first limiting structure (30) and the second limiting structure (40). The stop ring (20) includes a spiral component (21) and a first hook (22) and a second hook (23) respectively disposed at both ends of the spiral component (21). The spiral component (21) is located in the spiral guide groove (11). The first hook (22) and the first limiting structure (30) are in stop cooperation. The second hook (23) and the second limiting structure (40) are in stop cooperation. The first hook (22) extends away from the outer peripheral surface of the nut body (10), and the second hook (23) is located on the side of the screw (21) facing the second limiting structure (40). The second hook (23) extends along the axial direction of the nut body (10). The first limiting structure (30) is a limiting ring, and the first stop surface (31) is located on the limiting ring; The limiting ring includes an arc-shaped part (32) and a third hook (33) disposed at one end of the arc-shaped part (32). The third hook (33) is located on the side of the arc-shaped part (32) facing the stop ring (20). The third hook (33) extends in a direction away from the outer peripheral surface of the nut body (10). The first stop surface (31) is located on the outer side wall of the third hook (33). The outer side wall of the first hook (22) and the first stop surface (31) stop and cooperate.

2. The nut assembly according to claim 1, characterized in that, The second limiting structure (40) is a limiting block, and the second stop surface (41) is located on the outer side wall of the limiting block. The stop ring (20) and the outer side wall of the limiting block stop and cooperate.

3. The nut assembly according to claim 1, characterized in that, The limiting ring also includes a fourth hook (34) disposed at the other end of the arc-shaped member (32). The fourth hook (34) is located on the side of the arc-shaped member (32) away from the stop ring (20). The outer peripheral surface of the nut body (10) has a mating groove (12). The arc-shaped member (32) and / or the fourth hook (34) are limited and mated with the mating groove (12).

4. The nut assembly according to claim 1, characterized in that, The nut assembly also includes a connecting plate (50) and a limiting plate (60) connected to the nut body (10). The radial dimension of the limiting plate (60) is larger than the radial dimension of the nut body (10). The connecting plate (50) is detachably sleeved on the nut body (10), and the connecting plate (50) and the limiting plate (60) abut against each other.

5. An electronic expansion valve, characterized in that, The electronic expansion valve includes a valve body assembly (70), a rotor assembly (80), and a nut assembly as described in any one of claims 1 to 4. The nut assembly is disposed within the cavity of the valve body assembly (70). The rotor assembly (80) includes a rotor connecting plate (81), a guide plate (82), and a cylindrical magnetic rotor (83). The magnetic rotor (83) is movably disposed within the cavity of the valve body assembly (70). The rotor connecting plate (81) is located within the cavity of the magnetic rotor (83) and is fixedly connected to the magnetic rotor (83). The guide plate (82) is located within the cavity of the magnetic rotor (83) and is fixedly connected to the rotor connecting plate (81). The guide plate (82) and the stop ring (20) of the nut assembly are mutually limiting.

6. The electronic expansion valve according to claim 5, characterized in that, The nut assembly further includes a connecting plate (50) and a limiting plate (60) connected to the nut body (10). The radial dimension of the limiting plate (60) is larger than the radial dimension of the nut body (10). The connecting plate (50) is detachably sleeved on the nut body (10). The connecting plate (50) and the limiting plate (60) abut against each other. The valve body assembly (70) includes a valve cover (71) and a valve seat (72) connected to each other. The stop ring (20), the first limiting structure (30) and the second limiting structure (40) are all located in the cavity of the valve cover (71). A part of the nut body (10) is located in the cavity of the valve seat (72). Another part of the nut body (10) is located in the cavity of the valve cover (71). The connecting plate (50) and the valve seat (72) of the nut assembly are welded together.

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