Nut structure and electric valve

Abstract

The present application provides a nut structure and an electric valve including a nut body, a limiting structure protruding from the outer circumferential surface of the nut body and having a stop surface and an engagement surface, a spiral guide groove provided on the outer circumferential surface of the nut body, located on the side having the engagement surface of the limiting structure, one end of which originates from the engagement surface or originates in the extension direction of the engagement surface, and a retaining ring rotatably provided in the spiral guide groove and lockingly fitted to the stop surface. When this embodiment is used, in the process of assembling the retaining ring to the nut body, the engagement surface serves to guide the attachment of the retaining ring, and one end of the retaining ring close to the spiral guide groove enters directly into the spiral guide groove along the extension direction of the engagement surface, improving the attachment accuracy and attachment efficiency of the retaining ring. The retaining ring is lockingly fitted to the stop surface to limit the movement range of the retaining ring in the spiral guide groove and ensure the reliability of the nut structure.

Description

Technical Field

[0001] This application claims the priority of a patent application filed with the China National Intellectual Property Administration on March 4, 2022, with an application number of 202220476600.5 and an invention-creation title of "Nut Structure and Electric Valve", and also claims the priority of a patent application filed with the China National Intellectual Property Administration on March 4, 2022, with an application number of 202220482141.1 and an invention-creation title of "Nut Structure and Electric Valve".

[0002] This application relates to the technical field of electric valves, and specifically to a nut structure and an electric valve.

Background Art

[0003] In the nut structure of an electric valve in the prior art, during the process of assembling the retaining ring onto the nut body, the retaining ring may collide with the corner of the limiting structure or the like, resulting in friction and damage to the retaining ring or the limiting structure. When screwing the retaining ring into the spiral guide groove, in order to prevent the retaining ring from colliding with the edge of the spiral guide groove or the like, it is necessary to manually guide the movement of the retaining ring. However, since manual guiding has low guiding effect and efficiency, the assembly efficiency and assembly effect of the nut structure are reduced.

Summary of the Invention

[0004] This application provides a nut structure and an electric valve for improving the installation efficiency and installation accuracy of the retaining ring in the prior art.

[0005] To achieve the above object, according to one aspect of this application, this application provides a nut structure including a nut body, a limiting structure protruding from the outer peripheral surface of the nut body and having a stopping surface and an engaging surface, a spiral guide groove provided on the outer peripheral surface of the nut body, located on the side having the engaging surface of the limiting structure, and having one end starting from the engaging surface or starting from the extending direction of the engaging surface, and a retaining ring rotatably provided in the spiral guide groove and snap-fitted onto the stopping surface.

[0006] Furthermore, the engaging surface has a first guiding surface which is provided inclined with respect to the radial direction of the nut body, and the inclination direction of the first guiding surface is the same as the spiral direction of the spiral guiding groove so as to guide the retaining ring when the retaining ring is attached.

[0007] Furthermore, the limiting structure further has a bottom surface which is located on the side of the nut body having the spiral guiding groove, and both ends of the bottom surface are respectively connected to a stopping surface and the first guiding surface.

[0008] Furthermore, the bottom surface is provided perpendicular to the axis of the nut body. In a projection plane perpendicular to the first guiding surface and the bottom surface, when the connection position between the first guiding surface and the bottom surface is point A, and the included angle between the bottom surface and the tangent line passing through point A of the first guiding surface is q, then 90° ≤ q ≤ 180°.

[0009] Furthermore, when the maximum width of the limiting structure in the direction perpendicular to the tangent line is d, then 0.5 mm ≤ d ≤ 1 mm.

[0010] Furthermore, the spiral guiding groove extends along a pre-provided spiral. In a projection plane perpendicular to the stopping surface and parallel to the axis of the nut body, the stopping surface and the spiral form an included angle C, and 60° ≤ C ≤ 100°.

[0011] Furthermore, the limiting structure further has a top surface provided opposite to the bottom surface, the engaging surface further includes a second guiding surface connected to the first guiding surface, and both ends of the top surface are respectively connected to the stopping surface and the second guiding surface.

[0012] Furthermore, the top surface is provided inclined with respect to the radial direction of the nut body, and the inclination direction of the top surface is the same as the spiral direction of the spiral guiding groove.

[0013] Furthermore, the bottom surface is provided parallel to the radial direction of the nut body, the top surface and the bottom surface form an included angle α, and 5° ≤ α ≤ 15°.

[0014] Furthermore, the first guide surface includes a first arcuate segment, a straight segment, and a second arcuate segment that are connected in sequence. The first arcuate segment is connected to the second guide surface, the second arcuate segment is connected to the bottom surface, and the straight segment and the bottom surface form an included angle β, where 10° ≤ β ≤ 50°.

[0015] According to another aspect of the present application, an electric valve is provided that includes a valve body assembly and the nut structure described above, and the nut structure is located within the valve body assembly.

[0016] When the technical solution of the present application is applied, a nut structure is provided that includes a nut body, a limiting structure protruding from the outer peripheral surface of the nut body and having a stopping surface and an engaging surface, a spiral guide groove provided on the outer peripheral surface of the nut body and located on the side having the engaging surface of the limiting structure, with one end starting from the engaging surface or starting from the extending direction of the engaging surface, and a retaining ring rotatably provided in the spiral guide groove and snap-fitted to the stopping surface. When using this aspect, during the process of assembling the retaining ring to the nut body, the engaging surface plays a role in guiding the installation of the retaining ring. Specifically, one end of the retaining ring close to the spiral guide groove directly enters the spiral guide groove along the extending direction of the engaging surface. Therefore, in the prior art, the problem that the retaining ring or the spiral guide groove is easily damaged by manually guiding the installation of the retaining ring is avoided, and the installation accuracy and installation efficiency of the retaining ring are improved. After the assembly of the retaining ring is completed, one end of the retaining ring close to the limiting structure and the stopping surface are snap-fitted to limit the moving range of the retaining ring in the spiral guide groove, and at the same time, prevent the retaining ring from slipping out of the spiral guide groove during the moving process, ensuring the reliability of the nut structure.

Brief Description of the Drawings

[0017] The drawings in the specification that constitute a part of the present application are for providing a further understanding of the present application. The schematic embodiments and their descriptions of the present application are for interpreting the present application and do not unduly limit the present application.

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

[0019] Here, the above drawings include the following reference numerals. 10 Nut body, 20 Limiting structure, 21 Stopping surface, 22 Engaging surface, 221 First guide surface, 2211 First arc segment, 2212 Straight segment, 2213 Second arc segment, 222 Second guide surface, 23 Bottom surface, 24 Top surface, 30 Spiral guide groove, 40 Retaining ring, 41 Spiral member, 42 Hook, 50 Valve body assembly, 60 Second limiting structure, 70 Engaging plate.

Mode for Carrying Out the Invention

[0020] Hereinafter, the technical aspects in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0021] As shown in FIGS. 1 to 8, an embodiment of the present application provides a nut structure including a nut body 10, a limiting structure 20 protruding from the outer peripheral surface of the nut body 10 and having a stopping surface 21 and an engaging surface 22, a spiral guide groove 30 provided on the outer peripheral surface of the nut body 10 and located on the side having the engaging surface 22 of the limiting structure 20, with one end starting from the engaging surface 22 or starting from the extending direction of the engaging surface 22, and a retaining ring 40 rotatably provided in the spiral guide groove 30 and snap-fitted to the stopping surface 21.

[0022] In this embodiment, during the process of assembling the retaining ring 40 to the nut body 10, the engaging surface 22 plays a role in guiding the installation of the retaining ring 40. Specifically, one end of the retaining ring 40 close to the spiral guide groove 30 directly enters the spiral guide groove 30 along the extending direction of the engaging surface 22. Therefore, in the prior art, it is avoided that the retaining ring or the spiral guide groove is easily damaged by manually guiding the installation of the retaining ring, and the installation accuracy and installation efficiency of the retaining ring 40 are improved. After the assembly of the retaining ring 40 is completed, one end of the retaining ring 40 close to the limiting structure 20 and the stopping surface 21 are snap-fitted to limit the moving range of the retaining ring 40 in the spiral guide groove 30, and at the same time, prevent the retaining ring 40 from slipping out of the spiral guide groove 30 during the moving process, ensuring the reliability of the nut structure.

[0023] As shown in FIGS. 2 and 3, the engaging surface 22 has a first guide surface 221. The first guide surface 221 is provided inclined with respect to the radial direction of the nut body 10, and the inclination direction of the first guide surface 221 is the same as the spiral direction of the spiral guide groove 30 so as to guide the retaining ring 40 when installing the retaining ring 40.

[0024] By doing so, by guiding the attachment of the retaining ring 40 by the first guide surface 221, the inclination direction of the side of the retaining ring 40 close to the spiral guide groove 30 before entering the spiral guide groove 30 becomes the same as the spiral direction, making it easier for the retaining ring 40 to enter the spiral guide groove 30. In the prior art, due to the angle between the axis of the side of the retaining ring 40 close to the spiral guide groove 30 and the spiral direction of the spiral guide groove 30 being too large, when the retaining ring 40 enters the spiral guide groove 30, the retaining ring 40 collides with the spiral guide groove 30 and friction occurs, avoiding damage to the retaining ring 40 or the spiral guide groove 30, and ensuring the attachment reliability and attachment accuracy of the retaining ring 40.

[0025] Specifically, the limiting structure 20 further has a bottom surface 23, the bottom surface 23 is located on the side of the nut body 10 having the spiral guide groove 30, and both ends of the bottom surface 23 are respectively connected to the stop surface 21 and the first guide surface 221. Specifically, the bottom surface 23 extends along the radial direction of the nut body 10.

[0026] As shown in FIGS. 3 and 4, the bottom surface 23 is provided perpendicular to the axis of the nut body 10. In the projection plane perpendicular to the first guide surface 221 and the bottom surface 23, taking the connection position between the first guide surface 221 and the bottom surface 23 as point A, and the angle between the bottom surface 23 and the tangent line passing through point A of the first guide surface 221 as q, then 90° ≤ q ≤ 180°. By doing so, it is advantageous for the assembly of the retaining ring 40. Specifically, the engaging surface 22 is located within the region formed by the tangent line and the bottom surface. When q < 90° or q > 180°, the extending direction of the engaging surface 22 and the spiral direction of the spiral guide groove 30 are opposite, and the retaining ring 40 cannot be assembled. By limiting q to 90° - 180°, it can be ensured that the extending direction of the engaging surface 22 and the spiral direction of the spiral guide groove 30 are the same, making it easier to assemble the retaining ring 40 along the extending direction of the engaging surface 22 into the spiral guide groove 30, and ensuring the attachment reliability of the retaining ring 40.

[0027] Specifically, assuming that the maximum width of the limiting structure 20 in the direction perpendicular to the tangent line is d, then 0.5 mm ≤ d ≤ 1 mm. In this embodiment, the retaining ring 40 includes a spiral member and a hook connected to each other. By limiting the maximum width d, it is possible to prevent the situation where the limiting structure 20 cannot be accommodated within the pitch region of the spiral member due to d being too large, or the pitch of the spiral member being stretched and thus broken by being stretched. At the same time, it is possible to prevent the guiding role of the limiting structure 20 for the attachment of the retaining ring 40 from becoming unclear due to d being too small. In this embodiment, by limiting the upper and lower limits of d, the guiding for the attachment of the retaining ring 40 becomes easier, ensuring the attachment reliability of the retaining ring 40.

[0028] Furthermore, the spiral guide groove 30 extends along a pre - provided spiral line. On a projection plane that is perpendicular to the stop surface 21 and parallel to the axis of the nut body 10, the stop surface 21 and the spiral line form an included angle C, and 60° ≤ C ≤ 100°.

[0029] In this embodiment, C is restricted, that is, the rotation of the limiting structure 20 relative to the spiral line is restricted. However, if C > 100°, since the stop surface 21 becomes in the same direction as, and then parallel to, the spiral direction of the spiral guide groove, the retaining ring 40 will slide along the stop surface 21 and escape from the spiral guide groove 30 from above the limiting structure 20. If C < 60°, the stop surface 21 rotates towards the side close to the spiral guide groove 30 and forms an acute angle with the spiral guide groove 30. In this case, the stop surface 21 cannot perform the stopping role, and the top surface 24 rotates to the position where the stop surface 21 was located due to the rotation of the limiting structure 20, and the extending direction of the top surface 24 becomes the same as, and then parallel to, the spiral direction of the spiral guide groove, and the retaining ring 40 will slide along the top surface 24 and escape from the spiral guide groove 30 from above the limiting structure 20. In this embodiment, by restricting the range of both ends of C, during the process where the retaining ring 40 is stopped by the limiting structure 20, it is effectively prevented from escaping from the spiral guide groove 30, ensuring the stopping reliability of the limiting structure 20 for the retaining ring 40.

[0030] As shown in FIG. 3, the limiting structure 20 further has a top surface 24 provided opposite to the bottom surface 23. The engaging surface 22 further includes a second guide surface 222 connected to the first guide surface 221. Both ends of the top surface 24 are respectively connected to the stop surface 21 and the second guide surface 222.

[0031] In this embodiment, the second guide surface 222 is provided to extend along the axial direction of the nut body 10, and serves to assist in guiding the installation of the retaining ring 40. At the same time, by providing the second guide surface 222, the structural strength on the side of the first guide surface 221 of the limiting structure 20 is increased, ensuring the reliability of the limiting structure 20.

[0032] Specifically, the top surface 24 is provided to be inclined with respect to the radial direction of the nut body 10, and the inclination direction of the top surface 24 is the same as the spiral direction of the spiral guide groove 30. In this way, when the top surface 24 guides the installation of the retaining ring 40, it is possible to prevent the retaining ring 40 from being broken by being stretched due to the angle formed by the top surface 24 and the engaging surface 22 being too large, ensuring the installation reliability of the retaining ring 40.

[0033] As shown in FIGS. 3 and 4, the bottom surface 23 is provided parallel to the radial direction of the nut body 10. The top surface 24 and the bottom surface 23 form an included angle α, and 5° ≤ α ≤ 15°. In this way, it is possible to prevent the retaining ring 40 from only contacting the connection position between the top surface 24 and the stop surface 21 and the top surface 24 from being unable to play a guiding role due to the angle α being too small, or to prevent the retaining ring 40 from only contacting the connection position between the top surface 24 and the engaging surface 22 and the top surface 24 from being unable to play a guiding role due to the angle α being too large. The reliability of the top surface 24 in guiding the installation of the retaining ring 40 is ensured.

[0034] Specifically, the first guide surface 221 includes a first arcuate segment 2211, a straight segment 2212, and a second arcuate segment 2213 that are connected in sequence. The first arcuate segment 2211 is connected to the second guide surface 222, the second arcuate segment 2213 is connected to the bottom surface 23, and the straight segment 2212 and the bottom surface 23 form an included angle β, where 10° ≤ β ≤ 50°. By doing so, it is possible to avoid the angle between the extending direction of the straight segment 2212 and the spiral direction of the spiral guide groove 30 becoming too large due to β being too small or too large, enabling the retaining ring 40 to smoothly enter the spiral guide groove 30 under the guidance of the straight segment 2212, and ensuring the mounting reliability of the retaining ring 40.

[0035] As shown in FIGS. 5 to 8, the retaining ring 40 includes a spiral member 41. The spiral member 41 has a spiral structure and is rotatably provided in the spiral guide groove 30. If the number of spiral turns of the spiral member 41 is n, then n ≥ 2. In this embodiment, by limiting the number of spiral turns n of the spiral member 41, in the prior art, during the process of the retaining ring 40 rotating along the axial direction of the spiral guide groove 30, since the number of spiral turns of the spiral member 41 is too small, the contact area between the spiral member 41 and the spiral guide groove 30 becomes small. In particular, when the retaining ring 40 moves to both ends of the spiral guide groove 30, a part of the spiral member 41 is located inside the spiral guide groove 30 and the other part is located outside the spiral guide groove 30, further reducing the contact area between the spiral member 41 and the spiral guide groove 30, and avoiding the spiral member 41 being easily disengaged from the spiral guide groove 30, ensuring the reliability of the movement of the retaining ring 40 within the spiral guide groove 30, and further ensuring the reliability of the nut structure.

[0036] As shown in FIG. 6, when the cross-sectional diameter of the spiral member 41 is e, 0.8 mm ≤ e ≤ 1.0 mm. By doing so, due to the limitation on the diameter e of the spiral member 41, the contact area between the spiral member 41 and the spiral guide groove 30 increases. If e > 1.0 mm, most of the spiral member 41 is located outside the spiral guide groove 30, so the area of the spiral member 41 itself located within the spiral guide groove 30 becomes small, making it easy to come off during the movement process. If e < 0.8 mm, most or all of the spiral member 41 is located within the spiral guide groove 30, so during the process of the spiral member 41 moving within the spiral guide groove 30, it is easy to rattle along the arc-shaped surface of the spiral guide groove 30, and the spiral member 41 will come out of the spiral guide groove 30. Therefore, by the above parameter limitations, the reliability of the movement of the retaining ring 40 within the spiral guide groove 30 can be ensured, and the reliability of the nut structure can be ensured.

[0037] As shown in FIG. 7, when the pitch of the spiral member 41 is L, 1.3 mm ≤ L ≤ 1.5 mm. By doing so, pressing occurs between the spiral member 41 and the spiral guide groove 30, preventing damage to the spiral member 41 or the spiral guide groove. Specifically, if the pitch L of the spiral member 41 is too small, during the process of assembling the spiral member 41 into the spiral guide groove 30, due to the limitation by the distance between two adjacent turns of the spiral guide groove 30, the spiral member 41 receives an outward tension along the axial direction of the nut body 10, so the spiral member 41 expands and is damaged. If the pitch L of the spiral member 41 is too large, during the process of assembling the spiral member 41 into the spiral guide groove 30, due to the limitation by the distance between two adjacent turns of the spiral guide groove 30, the spiral member 41 receives an inward contraction force along the axial direction of the nut body 10, so the spiral member 41 is pressed and damaged.

[0038] Specifically, the spiral guide groove 30 is a spiral concave groove located on the outer peripheral surface of the nut body 10. By doing so, by directly providing the spiral guide groove 30 on the outer peripheral surface of the nut body 10, the problem in the prior art that the assembly of the nut body, the retaining ring, and the limiting spring is complicated is avoided, there is no need to reinstall the limiting spring, the installation process is simplified, the automatic installation of the retaining ring 40 and the nut body 10 becomes easy, and the production efficiency of the nut structure is further improved.

[0039] Optionally, this embodiment can also be applied to the nut structure with a limiting spring in the prior art. In this case, the spiral guide groove is a spiral region formed between the limiting spring fitted on the outer peripheral surface of the nut body and the outer peripheral surface of the nut body.

[0040] As shown in FIGS. 1 to 8, the nut structure includes a limiting structure 20 provided on the nut body 10, and one end of the retaining ring 40 is fixedly fitted to the limiting structure 20. By doing so, by restricting the movement of the retaining ring 40 in one direction along the axial direction of the nut body 10 by the limiting structure 20, the retaining ring 40 is prevented from completely coming out of the spiral guide groove 30, ensuring the reliability of the nut structure.

[0041] Specifically, the nut structure further includes an engagement plate 70. The engagement plate 70 is fitted to the nut body 10, and the spiral guide groove 30 is located on the side of the limiting structure 20 facing the engagement plate 70. By doing so, the connection between the nut body 10 and the valve body assembly 50 is realized by the engagement plate 70, ensuring the reliability of the connection.

[0042] As shown in FIGS. 6 and 8, the nut structure further includes a second limiting structure 60 provided on the nut body 10, and the other end of the retaining ring 40 is fixedly fitted to the second limiting structure 60. By doing so, by restricting the movement of the retaining ring 40 in another direction along the axial direction of the nut body 10 by the second limiting structure 60, the retaining ring 40 is prevented from completely coming out of the spiral guide groove 30, ensuring the reliability of the nut structure.

[0043] Specifically, the spiral guide groove 30 is located between the limiting structure 20 and the second limiting structure 60. As shown in FIG. 6, the limiting structure 20 restricts the upward movement of the retaining ring 40 along the axis of the nut body 10, and the second limiting structure 60 restricts the downward movement of the retaining ring 40 along the axis of the nut body 10. The number of turns of the spiral member 41 of the retaining ring 40 is designed to be 2 or more, so that when the limiting structure 20 stops and restricts the retaining ring 40, at least one turn of the spiral member can be completely located in the spiral guide groove 30. When the retaining ring 40 is stopped by the limiting structure 20, some of the spiral members 41 are located in the spiral guide groove 30, or all of the spiral members 41 are disengaged from the spiral guide groove 30, preventing the retaining ring 40 from disengaging from the spiral guide groove 30.

[0044] As shown in FIGS. 7 and 8, the retaining ring 40 further includes a hook 42 connected to one end of the spiral member 41. The hook 42 is snap-fitted to the second limiting structure 60, and the other end of the spiral member 41 is snap-fitted to the limiting structure 20. In this way, when the hook 42 is snap-fitted to the second limiting structure 60, it is ensured that no powder or only a small amount of powder is generated during the process that the lower end of the spiral member 41 stops and collides with the second limiting structure 60, preventing the powder generated by the stop collision from entering the spiral guide groove 30 and interfering with the movement of the spiral member 41 in the spiral guide groove 30, and ensuring the performance of the nut structure.

[0045] Optionally, the cross-sectional diameter of the spiral member 41 is equal to the cross-sectional diameter of the hook 42, and the hook 42 extends in a direction away from the outer peripheral surface of the nut body 10 along the radial direction of the nut body 10.

[0046] Specifically, the nut body 10, the limiting structure 20, and the second limiting structure 60 are of an integral structure. In this way, it is easy to integrally process and form the limiting structure 20, the second limiting structure 60, and the nut body 10, reducing the processing cost and improving the production efficiency of the nut structure.

[0047] Alternatively, both the limiting structure 20 and the second limiting structure 60 are limiting cams provided to protrude from the outer peripheral surface of the nut body 10.

[0048] As shown in FIG. 9, another embodiment of the present application includes a valve body assembly 50 and the nut structure described above, and the nut structure is located within the valve body assembly 50, providing an electric valve.

[0049] In this embodiment, during the process of assembling the retaining ring 40 in the nut structure to the nut body 10, the engaging surface 22 serves to guide the attachment of the retaining ring 40. Specifically, one end of the retaining ring 40 close to the spiral guide groove 30 directly enters the spiral guide groove 30 along the extending direction of the engaging surface 22, thereby improving the attachment accuracy and efficiency of the retaining ring 40. After the assembly of the retaining ring 40 is completed, one end of the retaining ring 40 close to the limiting structure 20 and the stopping surface 21 are snap-fitted to limit the movement range of the retaining ring 40 within the spiral guide groove 30, and at the same time prevent the retaining ring 40 from slipping out of the spiral guide groove 30 during the movement process, ensuring the reliability of the nut structure and further ensuring the reliability of the electric valve.

[0050] Also, in this embodiment, by limiting the number of spiral turns n of the spiral member 41 in the nut structure of the electric valve, it is avoided that the spiral member 41 is likely to slip out of the spiral guide groove 30, ensuring the reliability of the movement of the retaining ring 40 within the spiral guide groove 30, ensuring the reliability of the nut structure, and further ensuring the reliability of the electric valve.

[0051] The above-described are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes are possible to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the spirit and principles of the present application should be included within the protection scope of the present application.

Claims

1. a nut body (10); a limiting structure (20) protruding from the outer peripheral surface of the nut body (10) and having a stop surface (21) and an engaging surface (22); a spiral guide groove (30) provided on the outer peripheral surface of the nut body (10), located on the side having the engaging surface (22) of the limiting structure (20), and having one end starting from the engaging surface (22) or starting from the extending direction of the engaging surface (22); a stop ring (40) having a spiral member (41) with a spiral structure rotatably provided in the spiral guide groove (30) and being snap-fitted to the stop surface (21); an engaging plate (70) fitted to the nut body (10), wherein the spiral guide groove (30) is located on the side of the limiting structure (20) facing the engaging plate (70); a nut structure.

2. The engaging surface (22) includes a first guide surface (221), the first guide surface (221) is provided obliquely with respect to the axial direction or the circumferential direction of the nut body (10), and the inclination direction of the first guide surface (221) is the same as the spiral direction of the spiral guide groove (30) so as to guide the stop ring (40) when the stop ring (40) is attached. The nut structure according to Claim 1.

3. The limiting structure (20) further has a bottom surface (23), the bottom surface (23) is located on the side of the nut body (10) having the spiral guide groove (30), and both ends of the bottom surface (23) are respectively connected to the stop surface (21) and the first guide surface (221). The nut structure according to Claim 2.

4. The bottom surface (23) is provided perpendicular to the axis of the nut body (10), in a projection plane perpendicular to the first guide surface (221) and the bottom surface (23), taking the connection position between the first guide surface (221) and the bottom surface (23) as point A, and taking the included angle between the bottom surface (23) and the tangent line passing through point A of the first guide surface (221) as q, 90°≤q≤180° The nut structure according to Claim 3.

5. When the maximum width of the limiting structure (20) in the direction perpendicular to the tangent line is d, 0.5 mm≤d≤1 mm The nut structure according to Claim 4.

6. The spiral guide groove (30) extends along a pre-provided spiral line. In a projection plane perpendicular to the stop surface (21) and parallel to the axis of the nut body (10), the stop surface (21) and the spiral form an included angle C, 60° ≤ C ≤ 100° The nut structure according to claim 3, wherein the nut structure is as described above.

7. The limiting structure (20) further has a top surface (24) provided opposite to the bottom surface (23), The engaging surface (22) further includes a second guide surface (222) connected to the first guide surface (221), Both ends of the top surface (24) are respectively connected to the stop surface (21) and the second guide surface (222). The nut structure according to claim 3,

8. The top surface (24) is provided inclined with respect to the radial direction of the nut body (10), The inclination direction of the top surface (24) is the same as the spiral direction of the spiral guide groove (30). The nut structure according to claim 7,

9. The bottom surface (23) is provided parallel to the radial direction of the nut body (10), The top surface (24) and the bottom surface (23) form an included angle α, ５°≦α≦１５° The nut structure according to claim 8, wherein the nut structure is as described above.

10. The first guide surface (221) includes a first arcuate segment (2211), a straight segment (2212), and a second arcuate segment (2213) connected in sequence, The first arcuate segment (2211) is connected to the second guide surface (222), The second arcuate segment (2213) is connected to the bottom surface (23), The straight segment (2212) and the bottom surface (23) form an included angle β, １０°≦β≦５０° The nut structure according to claim 7, wherein the nut structure is as described above.

11. The number of spiral turns of the spiral member (41) is 2 or more. The nut structure according to claim 1.

12. Assuming the cross-sectional diameter of the spiral member (41) is e, 0.8 mm ≤ e ≤ 1.0 mm The nut structure according to claim 1, wherein the nut structure is as described above.

13. Assuming the pitch of the spiral member (41) is L, 1.3 mm ≤ L ≤ 1.5 mm The nut structure according to claim 1, wherein the nut structure is as described above.

14. The nut body (10) further includes a second limiting structure (60), One end of the retaining ring (40) is snap-fitted to the limiting structure (20), The other end of the retaining ring (40) is snap-fitted to the second limiting structure (60). The nut structure according to claim 1,

15. The retaining ring (40) further includes a hook (42) connected to one end of the spiral member (41), The hook (42) is snap-fitted to the second limiting structure (60), The other end of the screw member (41) is snap-fitted to the limiting structure (20). The nut structure according to claim 14.

16. The nut body (10), the limiting structure (20) and the second limiting structure (60) are of an integral structure. The nut structure according to claim 14.

17. A valve body assembly (50) and the nut structure according to any one of claims 1 to 16, The nut structure is located within the valve body assembly (50). Electric valve

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