WO2023165306A1 - Nut structure and electric valve - Google Patents

Abstract

Provided in the present application are a nut structure and an electric valve, the nut structure comprising: a nut body; a limiting structure protrudingly arranged on the outer circumferential surface of the nut body, the limiting structure having a stop face and a mating face; a spiral guide groove arranged on the outer circumferential surface of the nut body, the spiral guide groove being positioned on the side of the limiting structure with the mating face, and one end of the spiral guide groove taking the mating face as a starting point or taking the direction of extension of the mating face as a starting point; and a stop ring rotatably arranged in the spiral guide groove, the stop ring having a stop fit with the stop face. Using the present solution, during installation of the stop ring in the nut body, the mating face guides the installation of the stop ring, and the end of the stop ring closest to the spiral guide groove can directly enter the spiral guide groove in the direction of extension of the mating face, improving the installation precision and the installation efficiency of the stop ring. The stop ring has a stop fit with the stop face in order to limit the range of movement of the stop ring on the spiral guide groove, ensuring the reliability of the nut structure.

Description

Nut structure and electric valve

This application claims the priority of the patent application submitted to the State Intellectual Property Office of China on March 4, 2022, with the application number 202220476600.5, and the invention name is "nut structure and electric valve"; The priority of the patent application with the application number 202220482141.1 and the invention name "nut structure and electric valve" submitted to the State Intellectual Property Office of China.

technical field

The present application relates to the technical field of electric valves, in particular, to a nut structure and electric valves.

Background technique

In the nut structure of the electric valve in the prior art, when the stop ring is installed into the nut body, the stop ring will collide with the corners of the limiting structure and cause damage to the stop ring or the limiting structure. situation, and when the stop ring is screwed into the spiral guide groove, in order to prevent the collision between the stop ring and the edge of the spiral guide groove, etc., it is necessary to manually guide the movement of the stop ring, but the guiding effect and efficiency of manual guidance are relatively low. Low, which reduces the assembly efficiency and assembly effect of the nut structure.

application content

The present application provides a nut structure and an electric valve to improve the installation efficiency and installation accuracy of the retaining ring in the prior art.

In order to achieve the above object, according to one aspect of the present application, the present application provides a nut structure, including: a nut body; The surface; the spiral guide groove is arranged on the outer peripheral surface of the nut body, and the spiral guide groove is located on the side of the limiting structure with the mating surface, wherein one end of the spiral guide groove starts from the mating surface or takes the extending direction of the mating surface as the starting point; The stop ring is rotatably arranged in the spiral guide groove, and the stop ring cooperates with the stop surface.

Further, the mating surface includes a first guide surface, the first guide surface is inclined relative to the radial direction of the nut body, and the inclination direction of the first guide surface is the same as the helical direction of the helical guide groove, so as to prevent the stop ring when installing the stop ring. circle to guide.

Further, the position-limiting structure also has a bottom surface, which is located on one side of the nut main body having the spiral guide groove, and two ends of the bottom surface are respectively connected to the stop surface and the first guide surface.

Further, the bottom surface is set perpendicular to the axis of the nut body; on the projection plane perpendicular to the first guide surface and the bottom surface, the connection position between the first guide surface and the bottom surface is point A, and the tangent line passing through point A between the bottom surface and the first guide surface The included angle is q, 90°≤q≤180°.

Further, in the direction perpendicular to the tangent, the maximum width of the limiting structure is d, 0.5mm≤d≤1mm.

Further, the spiral guide groove extends along a preset helix, and on a projection plane perpendicular to the stop surface and parallel to the axis of the nut body, an included angle C is formed between the stop surface and the helix, 60°≤C≤100 °.

Further, the limiting structure also has a top surface opposite to the bottom surface, the mating surface further includes a second guide surface connected to the first guide surface, and two ends of the top surface are respectively connected to the stop surface and the second guide surface.

Further, the top surface is inclined relative to the radial direction of the nut body, and the inclination direction of the top surface is the same as the helical direction of the helical guide groove.

Further, the bottom surface is arranged parallel to the radial direction of the nut body, and an included angle α is formed between the top surface and the bottom surface, and 5°≤α≤15°.

Further, the first guide surface includes a first arc segment, a straight line segment and a second arc segment connected in sequence, the first arc segment is connected to the second guide surface, the second arc segment is connected to the bottom surface, and the straight segment and the bottom surface are connected. An included angle β is formed between the bottom surfaces, and 10°≤β≤50°.

According to another aspect of the present application, an electric valve is provided. The electric valve includes a valve body assembly and the above-mentioned nut structure, and the nut structure is located in the valve body assembly.

Applying the technical solution of the present application, a nut structure is provided, including: a nut body; a position-limiting structure, which is protrudingly arranged on the outer peripheral surface of the nut body, and the position-limiting structure has a stop surface and a mating surface; a spiral guide groove, which is set On the outer peripheral surface of the nut main body, the spiral guide groove is located on the side of the limit structure with a mating surface, wherein one end of the spiral guide groove starts from the mating surface or the extending direction of the mating surface; the stop ring, the stop ring It is rotatably arranged in the spiral guide groove, and the stop ring cooperates with the stop surface. With this solution, when the stop ring is installed into the nut body, the mating surface will guide the installation of the stop ring. Specifically, the end of the stop ring close to the spiral guide groove will directly enter the screw along the extension direction of the mating surface. In the guide groove, it is avoided that manual guidance is used for the installation of the stop ring in the prior art, which is easy to cause damage to the stop ring or the spiral guide groove, and the installation accuracy and installation efficiency of the stop ring are improved. After the stop ring is assembled, the end of the stop ring close to the limit structure is matched with the stop surface to limit the movement range of the stop ring on the spiral guide groove, and at the same time prevent the stop ring from moving from the spiral during the movement. The situation of protruding from the guide groove ensures the reliability of the nut structure.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached picture:

Fig. 1 shows the structural representation of the nut structure that the embodiment of the present application provides;

Fig. 2 shows the structural representation of the nut body and the helical guide groove of the nut structure of Fig. 1;

Figure 3 shows an enlarged view of selected locations in Figure 2;

Fig. 4 shows the dimensioning diagram of Fig. 3;

Fig. 5 shows another schematic diagram of the nut structure provided by the embodiment of the present application;

Fig. 6 shows the front view of the nut structure of Fig. 5;

Fig. 7 shows a schematic structural view of the stop ring in the nut structure of Fig. 5;

Fig. 8 shows a schematic diagram of the abutment between the stop ring and the second limiting structure in the nut structure of Fig. 5;

Fig. 9 shows a schematic structural diagram of an electric valve provided by another embodiment of the present application.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Nut body;

20, limit structure; 21, stop surface; 22, mating surface; 221, first guide surface; 2211, first arc section; 2212, straight line section; 2213, second arc section; 222, second guide Surface; 23, bottom surface; 24, top surface;

30. Spiral guide groove;

40, stop ring; 41, screw; 42, folding hook;

50. Valve body assembly;

60. The second limiting structure;

70, matching plate.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

As shown in Figures 1 to 8, the embodiment of the present application provides a nut structure, including: a nut body 10; The retaining surface 21 and the mating surface 22; the spiral guide groove 30 is arranged on the outer peripheral surface of the nut body 10, and the spiral guide groove 30 is located on the side of the limiting structure 20 with the mating surface 22, wherein one end of the spiral guide groove 30 is connected to the mating surface 22 as the starting point or the extending direction of the mating surface 22 as the starting point; the stop ring 40, the stop ring 40 is rotatably arranged in the spiral guide groove 30, and the stop ring 40 and the stop surface 21 stop and cooperate.

In this embodiment, during the process of installing the stop ring 40 into the nut body 10, the mating surface 22 will guide the installation of the stop ring 40, specifically, the end of the stop ring 40 close to the spiral guide groove 30 will Directly enter the spiral guide groove 30 along the extension direction of the mating surface 22, avoiding the manual guidance of the installation of the stop ring in the prior art, which is easy to cause damage to the stop ring or the spiral guide groove, and improves the stop ring 40 The installation accuracy and installation efficiency. After the stop ring 40 is assembled, the end of the stop ring 40 close to the limit structure 20 is matched with the stop surface 21 to limit the movement range of the stop ring 40 on the spiral guide groove 30, and at the same time prevent the stop ring from 40 escapes from the situation in the spiral guide groove 30 during the moving process to ensure the reliability of the nut structure.

As shown in FIGS. 2 and 3 , the mating surface 22 includes a first guide surface 221 . The first guide surface 221 is arranged obliquely relative to the radial direction of the nut body 10 . The directions are the same to guide the stop ring 40 when installing the stop ring 40 .

Arranged in this way, the installation of the stop ring 40 is guided by the first guide surface 221, so that the inclination direction of the side of the stop ring 40 close to the spiral guide groove 30 is the same as the helical direction before entering the spiral guide groove 30, which is convenient for stopping The ring 40 enters the spiral guide groove 30, avoiding the excessive angle between the axis of the side of the stop ring 40 near the spiral guide groove 30 and the helical direction of the spiral guide groove 30 in the prior art, causing the stop ring 40 to enter the spiral guide groove At 30 o'clock, when the stop ring 40 and the spiral guide groove 30 collide and rub so that the stop ring 40 or the spiral guide groove 30 is damaged, the reliability and installation accuracy of the stop ring 40 are guaranteed.

Specifically, the limiting structure 20 also has a bottom surface 23 located on one side of the nut body 10 having the helical guide groove 30 , and two 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 .

As shown in Figures 3 and 4, the bottom surface 23 is arranged perpendicular to the axis of the nut body 10; on the projection plane perpendicular to the first guide surface 221 and the bottom surface 23, the connection position between the first guide surface 221 and the bottom surface 23 is point A, The included angle between the bottom surface 23 and the tangent of the first guide surface 221 passing through the point A is q, and 90°≤q≤180°. Such arrangement facilitates the packing of the stop ring 40 . Specifically, the mating surface 22 is located in the area formed by the tangent and the bottom surface. If q<90° or q>180°, the extension direction of the mating surface 22 is opposite to the helical direction of the helical guide groove 30, and the stop ring 40 cannot Loading condition. Limiting q between 90° and 180° can ensure that the extension direction of the mating surface 22 is the same as the helical direction of the spiral guide groove 30, so that the stop ring 40 can be inserted into the spiral guide groove 30 along the extension direction of the mating surface 22, The reliability of the installation of the stop ring 40 is ensured.

Specifically, in the direction perpendicular to the tangent, the maximum width of the limiting structure 20 is d, 0.5mm≤d≤1mm. In this embodiment, the stop ring 40 includes interconnected helical parts and folding hooks. By limiting the maximum width d, it is prevented that the limit structure 20 cannot be accommodated in the pitch area of the helical part due to too large d, or the helical The pitch of the component is stretched or even broken, and at the same time, it is prevented that the guiding effect of the limiting structure 20 on the installation of the stop ring 40 is not obvious due to too small d. In this embodiment, the upper limit and the lower limit of d are defined to facilitate the guide installation of the stop ring 40 and ensure the reliability of the stop ring 40 installation.

Further, the helical guide groove 30 extends along a preset helical line, and on a projected plane perpendicular to the stop surface 21 and parallel to the axis of the nut main body 10, an included angle C is formed between the stop surface 21 and the helix, 60° ≤C≤100°.

In this embodiment, C is limited, that is, the rotation of the limiting structure 20 relative to the helix is limited. If C>100°, the helical direction of the stop surface 21 and the helical guide groove will be the same or even parallel. , so that the stop ring 40 escapes from the helical guide groove 30 from the limiting structure 20 along the stop surface 21; if C<60°, it will cause the stop surface 21 to rotate toward the side close to the helical guide groove 30 and to be in contact with the helical guide groove 30 forms an acute angle, at this time, the stop surface 21 cannot play a stop role, and the top surface 24 will rotate to the position of the stop surface 21 due to the rotation of the limit structure 20, and the extension direction of the top surface 24 and the spiral The helical directions of the guide grooves are the same or even parallel, and the stop ring 40 will come out of the helical guide groove 30 from the limiting structure 20 along the top surface 24 . In this embodiment, by restricting the range at both ends of C, it is possible to effectively prevent the stop ring 40 from falling out of the spiral guide groove 30 during the process of stopping by the stop structure 20, thereby ensuring that the stop ring 40 has a positive impact on the stop by the stop structure 20. The reliability of the ring 40 stop.

As shown in FIG. 3 , the position-limiting structure 20 also has a top surface 24 opposite to the bottom surface 23, and the mating surface 22 also includes a second guide surface 222 connected to the first guide surface 221. The blocking surface 21 and the second guiding surface 222 are connected.

In this embodiment, the second guide surface 222 is extended along the axial direction of the nut body 10, and the second guide surface 222 plays an auxiliary guiding role for the installation of the stop ring 40. At the same time, by setting the second guide surface 222, increased The structural strength of the side of the first guide surface 221 of the limiting structure 20 ensures the reliability of the limiting structure 20 .

Specifically, the top surface 24 is inclined relative to the radial direction of the nut body 10 , and the inclination direction of the top surface 24 is the same as the helical direction of the helical guide groove 30 . In this way, the installation of the stop ring 40 is guided by the top surface 24, preventing the excessive angle formed between the top surface 24 and the mating surface 22 from causing the stop ring 40 to be damaged and damaged, and ensuring the stop ring 40 installation reliability.

As shown in FIG. 3 and FIG. 4 , the bottom surface 23 is arranged parallel to the radial direction of the nut body 10 , and an angle α is formed between the top surface 24 and the bottom surface 23 , 5°≤α≤15°. It is set in this way to prevent the stop ring 40 from being in contact with the connection position of the top surface 24 and the stop surface 21 due to the small angle α, so that the top surface 24 cannot play a guiding role, or to prevent the situation that the top surface 24 cannot play a guiding role due to the small angle α. The stop ring 40 can only contact the connection position of the top surface 24 and the mating surface 22 , resulting in the situation that the top surface 24 cannot play a guiding role. This ensures the reliability of the installation and guidance of the top surface 24 to the stop ring 40 .

Specifically, the first guide surface 221 includes a first arc segment 2211, a straight line segment 2212 and a second arc segment 2213 connected in sequence, the first arc segment 2211 is connected to the second guide surface 222, and the second arc segment 2213 Connecting with the bottom surface 23, the angle β is formed between the straight line segment 2212 and the bottom surface 23, and 10°≤β≤50°. This setting avoids the situation that the angle between the extension direction of the straight line segment 2212 and the helical direction of the spiral guide groove 30 is too large due to too small or too large angle β, and ensures that the stop ring 40 can pass through the guidance of the straight line segment 2212 smoothly. Enter the spiral guide groove 30 to ensure the reliability of the stop ring 40 installation.

As shown in Figures 5 to 8, the stop ring 40 includes a screw 41, the screw 41 is a helical structure, and the screw 41 is rotatably arranged in the helical guide groove 30; the number of helical turns of the screw 41 is n, n ≥2. In this embodiment, the number of helical turns n of the helical member 41 is quantitatively limited, which avoids that in the prior art, when the stop ring 40 rotates along the axial direction of the helical guide groove 30, due to the helical turns of the helical member 41 If the number is too small, the contact area between the spiral member 41 and the spiral guide groove 30 is small, especially when the stop ring 40 moves to both ends of the spiral guide groove 30, part of the spiral member 41 is located in the spiral guide groove 30, and the other part is located in the spiral guide groove 30. outside the guide groove 30, so that the contact area between the spiral member 41 and the spiral guide groove 30 is further reduced, resulting in the situation that the spiral member 41 is easy to escape from the spiral guide groove 30, ensuring the reliability of the stop ring 40 moving on the spiral guide groove 30 Sex, thereby ensuring the reliability of the nut structure.

As shown in FIG. 6 , the cross-sectional diameter of the spiral member 41 is e, and 0.8mm≤e≤1.0mm. In this way, by limiting the diameter e of the screw 41, the contact area between the screw 41 and the spiral guide groove 30 is relatively large. If e>1.0mm, most of the screw 41 will be located outside the spiral guide groove 30. The area where the screw 41 itself is located in the spiral guide groove 30 becomes smaller, and it is easy to fall off during the movement; if e<0.8mm, most or all of the screw 41 will be located in the spiral guide groove 30, so that the screw 41 41 tends to move along the arc surface of the spiral guide groove 30 during the movement in the spiral guide groove 30, causing the spiral member 41 to come out of the spiral guide groove 30. Therefore, the above parameters can ensure that the stop ring 40 is in the The reliability of movement on the spiral guide groove 30 ensures the reliability of the nut structure.

As shown in FIG. 7 , the pitch of the screw 41 is L, and 1.3mm≤L≤1.5mm. This arrangement prevents the spiral member 41 from being squeezed with the helical guide groove 30 and causes damage to the helical member 41 or the helical guide groove. Specifically, if the pitch L of the helical member 41 If the screw is too small, when the screw 41 is installed into the screw guide groove 30, it is limited by the distance between two adjacent turns of the screw guide groove 30, causing the screw 41 to be subjected to an outward force along the axis of the nut body 10. tension, so that the expansion of the screw 41 is damaged; if the pitch L of the screw 41 is too large, in the process of installing the screw 41 into the spiral guide groove 30, the distance between two adjacent turns of the spiral guide groove 30 will cause The restriction causes the screw 41 to be subjected to an inward contraction force along the axis of the nut body 10 , so that the screw 41 is crushed and damaged.

Specifically, the spiral groove 30 is a spiral groove on the outer peripheral surface of the nut body 10 . Arranged in this way, the spiral guide groove 30 is directly arranged on the outer peripheral surface of the nut body 10, which avoids the complicated assembly of the nut body, the stop ring and the limit spring in the prior art, and does not need to install the limit spring again, which simplifies the process. The installation process facilitates automatic installation of the stop ring 40 and the nut body 10, further improving the production efficiency of the nut structure.

Optionally, this solution is also applicable to the nut structure with a limit spring in the prior art. At this time, the spiral guide groove is a helical area formed between the limit spring sleeved on the outer peripheral surface of the nut body and the outer peripheral surface of the nut body .

As shown in FIGS. 1 to 8 , the nut structure includes a limiting structure 20 disposed on the nut body 10 , and one end of the stop ring 40 is engaged with the limiting structure 20 . Arranged in this way, the movement of the stop ring 40 in one direction along the axial direction of the nut main body 10 is restricted by the position-limiting structure 20, preventing the stop ring 40 from completely detaching from the spiral guide groove 30, and ensuring the reliability of the nut structure. sex.

Specifically, the nut structure further includes a matching plate 70 sleeved on the nut body 10 , and the spiral guide groove 30 is located on a side of the limiting structure 20 facing the matching plate 70 . In this way, the connection between the nut body 10 and the valve body assembly 50 is realized through the matching plate 70, ensuring the reliability of the connection.

As shown in FIG. 6 and FIG. 8 , the nut structure further includes a second limiting structure 60 disposed on the nut body 10 , and the other end of the stop ring 40 is engaged with the second limiting structure 60 . Arranged in this way, the movement of the stop ring 40 in the other direction along the axis direction of the nut main body 10 is restricted by the second limit structure 60, preventing the stop ring 40 from completely detaching from the spiral guide groove 30, ensuring the nut structural reliability.

Specifically, the spiral guide groove 30 is located between the limiting structure 20 and the second limiting structure 60. As shown in FIG. The limit structure 60 limits the downward movement of the stop ring 40 along the axis of the nut body 10, and the number of turns of the screw 41 of the stop ring 40 is designed to be greater than or equal to 2 turns. When the stop ring 40 is stopped by the limit structure 20 When the position is limited, it can be ensured that at least one complete turn of the screw is on the spiral guide groove 30, and when the stop ring 40 and the limit structure 20 are stopped, a small part of the screw 41 is located in the spiral guide groove 30 or the screw 41 All disengagement from the helical guide groove 30 results in a situation where the retaining ring 40 disengages from the helical guide groove 30 .

As shown in Figures 7 and 8, the stop ring 40 also includes a folding hook 42, which is connected to one end of the screw 41, wherein the folding hook 42 and the second limiting structure 60 stop fit, and the screw 41 The other end is engaged with the stopper of the limiting structure 20 . Arranged in this way, through the stop cooperation of the folding hook 42 and the second stop structure 60, it is ensured that no or less powder is produced during the collision between the lower end of the screw 41 and the second stop structure 60, preventing the The powder produced by the impact enters into the spiral guide groove 30 and hinders the movement of the screw member 41 in the spiral guide groove 30 to ensure the performance of the nut structure.

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 along the radial direction of the nut body 10 away from the outer peripheral surface of the nut body 10 .

Specifically, the nut body 10 , the limiting structure 20 and the second limiting structure 60 are integrally formed. Such arrangement facilitates integral processing of the limiting structure 20 , the second limiting structure 60 and the nut body 10 , reduces processing costs, and improves the production efficiency of the nut structure.

Optionally, both the limiting structure 20 and the second limiting structure 60 are limiting protrusions protruding from the outer peripheral surface of the nut body 10 .

As shown in FIG. 9 , another embodiment of the present application provides an electric valve. The electric valve includes a valve body assembly 50 and the above-mentioned nut structure, and the nut structure is located in the valve body assembly 50 .

In this embodiment, when the stop ring 40 in the nut structure is installed into the nut body 10, the mating surface 22 will guide the installation of the stop ring 40, specifically, the stop ring 40 is close to the spiral guide groove One end of 30 will directly enter into the spiral guide groove 30 along the extending direction of the mating surface 22 , which improves the installation accuracy and installation efficiency of the stop ring 40 . After the stop ring 40 is assembled, the end of the stop ring 40 close to the limit structure 20 is matched with the stop surface 21 to limit the movement range of the stop ring 40 on the spiral guide groove 30, and at the same time prevent the stop ring from The situation that 40 escapes from the spiral guide groove 30 during the moving process ensures the reliability of the nut structure and further ensures the reliability of the electric valve.

Moreover, in this embodiment, the number of turns n of the helical member 41 of the nut structure in the electric valve is limited in number, so as to avoid the situation that the helical member 41 is easy to escape from the helical guide groove 30, and ensure that the stop ring 40 is in the helical guide groove. The reliability of the movement on the groove 30 ensures the reliability of the nut structure, thereby ensuring the reliability of the electric valve.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (18)

A nut structure, characterized in that it comprises: nut body (10); A limiting structure (20), protrudingly arranged on the outer peripheral surface of the nut body (10), the limiting structure (20) has a stop surface (21) and a mating surface (22); A spiral guide groove (30) is arranged on the outer peripheral surface of the nut body (10), the spiral guide groove (30) is located on the side of the limiting structure (20) having the matching surface (22), Wherein, one end of the spiral guide groove (30) starts from the mating surface (22) or takes the extending direction of the mating surface (22) as the starting point; A stop ring (40), the stop ring (40) is rotatably arranged in the spiral guide groove (30), and the stop ring (40) and the stop surface (21) stop fit . The nut structure according to claim 1, characterized in that, the mating surface (22) includes a first guide surface (221), and the diameter of the first guide surface (221) relative to the nut body (10) The direction of inclination of the first guide surface (221) is the same as the helical direction of the spiral guide groove (30), so that when the stop ring (40) is installed, the stop ring (40) ) to boot. The nut structure according to claim 2, characterized in that, the limiting structure (20) also has a bottom surface (23), and the bottom surface (23) is located on the nut main body (10) with the spiral guide groove ( 30), the two ends of the bottom surface (23) are respectively connected with the stop surface (21) and the first guide surface (221). The nut structure according to claim 3, characterized in that, the bottom surface (23) is arranged perpendicular to the axis of the nut body (10); when perpendicular to the first guide surface (221) and the bottom surface ( 23) on the projection plane, the connection position between the first guide surface (221) and the bottom surface (23) is point A, and the point A passes through the bottom surface (23) and the first guide surface (221). The included angle of the tangent line of A is q, and 90°≤q≤180°. The nut structure according to claim 4, characterized in that, in the direction perpendicular to the tangent, the maximum width of the limiting structure (20) is d, 0.5mm≤d≤1mm. The nut structure according to claim 3, characterized in that, the helical guide groove (30) extends along a preset helical line, perpendicular to the stop surface (21) and parallel to the nut body (10) ) axis, an included angle C is formed between the stop surface (21) and the helix, and 60°≤C≤100°. The nut structure according to claim 3, characterized in that, the limiting structure (20) also has a top surface (24) opposite to the bottom surface (23), and the mating surface (22) also includes a The second guide surface (222) connected to the first guide surface (221), the two 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 7, characterized in that, the top surface (24) is arranged obliquely relative to the radial direction of the nut body (10), and the inclination direction of the top surface (24) and the spiral The helical directions of the guide grooves (30) are the same. The nut structure according to claim 8, characterized in that, the bottom surface (23) is set parallel to the radial direction of the nut body (10), and the top surface (24) and the bottom surface (23) An angle α is formed between them, 5°≤α≤15°. The nut structure according to claim 7, characterized in that, the first guide surface (221) comprises a first arc segment (2211), a straight line segment (2212) and a second arc segment (2213) connected in sequence , the first arc segment (2211) is connected to the second guide surface (222), the second arc segment (2213) is connected to the bottom surface (23), and the straight segment (2212) and An included angle β is formed between the bottom surfaces (23), and 10°≤β≤50°. The nut structure according to claim 1, characterized in that, the stop ring (40) comprises a screw (41), the screw (41) is a helical structure, and the screw (41) is rotatable It is arranged in the spiral guide groove (30); the number of spiral turns of the spiral member (41) is n, where n≥2. The nut structure according to claim 11, characterized in that, the cross-sectional diameter of the screw (41) is e, 0.8mm≤e≤1.0mm. The nut structure according to claim 11, characterized in that the pitch of the screw (41) is L, 1.3mm≤L≤1.5mm. The nut structure according to claim 11, characterized in that, the nut structure further comprises a fitting plate (70), the fitting plate (70) is sheathed on the nut body (10), and the spiral guide groove (30) is located on the side of the limiting structure (20) facing the matching plate (70). The nut structure according to claim 11, characterized in that, the nut structure further comprises a second limiting structure (60) arranged on the nut body (10), and one end of the stop ring (40) The other end of the stop ring (40) is matched with the stopper of the second limiter structure (60). The nut structure according to claim 15, characterized in that, the retaining ring (40) further comprises a folding hook (42), and the folding hook (42) is connected to one end of the screw (41), wherein , the folding hook (42) is in stop fit with the second limiting structure (60), and the other end of the screw (41) is in stop fit with the limit structure (20). The nut structure according to claim 15, characterized in that, the nut main body (10), the limiting structure (20) and the second limiting structure (60) are integrally constructed. An electric valve, characterized in that the electric valve comprises a valve body assembly (50) and the nut structure according to any one of claims 1 to 17, the nut structure is located in the valve body assembly (50) .