Joint nut and stop valve

Abstract

The application relates to the technical field of valves, in particular to a joint nut and a stop valve. The joint nut is used for mounting a connecting pipe on a valve body of the stop valve, and the joint nut comprises a nut body and a reinforcing structure. A connecting hole penetrating through the axial two ends of the nut body is formed in the nut body, and the connecting hole is provided with a threaded structure for cooperating with the connecting pipe and the valve body. The reinforcing structure is connected to the end of the nut body along the axial direction of the reinforcing structure, and the reinforcing structure protrudes from the outer periphery of the corresponding end of the nut body. The joint nut and the stop valve provided by the application solve the problem that cracks are easily generated at the end during the connection of the existing joint nut.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a connector nut and a gate valve. Background Technology

[0002] Gate valves are commonly used in air conditioning systems to open or close air conditioning lines. A gate valve typically consists of a valve body, a connecting pipe, and a fitting nut; the connecting pipe is attached to the valve body via the fitting nut.

[0003] In related technologies, the connector nut is threaded to the connector head on the valve body. During the tightening process, the connector nut often experiences stress cracking due to excessive force. The cracks usually form at the end of the connector nut and then spread in a long strip to the other side, causing the connector nut to fail to seal and tighten. Utility Model Content

[0004] Therefore, it is necessary to provide a connector nut and a shut-off valve to solve the problem that cracks easily occur at the ends when connecting existing connector nuts.

[0005] This application provides a connector nut for installing a connecting pipe onto the valve body of a gate valve. The connector nut includes a nut body and a reinforcing structure. The nut body has a connecting hole extending through both ends of the nut body along its axial direction. The connecting hole is provided with a threaded structure for cooperating with the connecting pipe and the valve body. The reinforcing structure is connected to the end of the nut body along its own axial direction and protrudes from the outer periphery of the corresponding end of the nut body.

[0006] In one embodiment, the inner wall of the connecting hole is provided with an internal thread, the wall thickness of the nut body at the major diameter of the internal thread is d (min), the axial height of the nut body is L, and the cross-sectional area of ​​the reinforcing structure is S, where S = d (min) × L.

[0007] In one embodiment, the outer peripheral wall of the end of the nut body protrudes in a direction away from the axis of the nut body to form the reinforcing structure.

[0008] In one embodiment, the reinforcing structure is axially connected to the end of the nut body.

[0009] In one embodiment, the reinforcing structure is annular and coaxially arranged with the connecting hole, and the inner diameter of the reinforcing structure is larger than the inner diameter of the connecting hole.

[0010] In one embodiment, the connecting hole includes a threaded section and a through-hole section, the threaded section and the through-hole section being interconnected and communicating with each other; wherein, the threaded section extends to one end of the nut body and is used to engage with the valve body threadedly, and the through-hole section extends to the other end of the nut body and is used to engage with the connecting pipe.

[0011] In one embodiment, the reinforcing structure and the nut body are integrally formed.

[0012] In one embodiment, the two ends of the nut body along its own axial direction are defined as a first end and a second end, the number of the reinforcing structure is one, and the reinforcing structure is connected to the first end or the second end.

[0013] In one embodiment, the number of the reinforcing structures is two, and the two reinforcing structures are respectively connected to opposite ends of the nut body along its own axial direction.

[0014] This application also provides a shut-off valve, which includes a valve body, a connecting pipe, and a connector nut as described in any of the above embodiments, wherein the connecting pipe is connected to the valve body through the connector nut.

[0015] Compared with the prior art, the connector nut and gate valve provided in this application can effectively improve the structural strength of the end of the nut body by setting a reinforcing structure at the end of the nut body and making the reinforcing structure protrude from the outer periphery of the nut body. This reduces the probability of stress cracking of the nut body from the end during the tightening process by wrenches or other means, greatly improving the reliability of the connector nut and ensuring a firm connection between the connector nut and the pipe and valve body. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a shut-off valve according to an embodiment of this application;

[0018] Figure 2 A schematic diagram of the structure of a connector nut according to an embodiment provided in this application;

[0019] Figure 3 A schematic diagram of the structure of a connector nut according to another embodiment provided in this application;

[0020] Figure 4A schematic diagram of the structure of a connector nut according to another embodiment provided in this application;

[0021] Figure 5 for Figure 4 The diagram shows the structure of the connector nut from another perspective.

[0022] The symbols in the diagram represent the following meanings:

[0023] 100. Gate valve; 10. Connector nut; 101. Connecting hole; 1011. Threaded section; 1012. Through hole section; 11. Nut body; 12. Reinforcing structure; 20. Valve body; 21. Connector; 30. Pipe. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0029] Gate valves are commonly used in air conditioning systems to open or close air conditioning lines. A gate valve typically consists of a valve body, a connecting pipe, and a fitting nut; the connecting pipe is attached to the valve body via the fitting nut.

[0030] In related technologies, the connector nut is threaded to the connector head on the valve body. During the tightening process, the connector nut often experiences stress cracking due to excessive force. The cracks usually form at the end of the connector nut and then spread in a long strip to the other side, causing the connector nut to fail to seal and tighten.

[0031] Please see Figures 1-5 To address the problem of cracks easily forming at the ends of existing connector nuts during connection, this application provides a connector nut 10, which is used to install the connecting pipe 30 onto the valve body 20 of the shut-off valve 100 to achieve connection between the connecting pipe 30 and the valve body 20 and ensure a seal.

[0032] Furthermore, the connector nut 10 includes a nut body 11, on which a connecting hole 101 is provided, penetrating both axial ends of the nut body 11. The connecting hole 101 is provided with a threaded structure for mating with the connecting pipe 30 and the valve body 20. The connecting hole 101 includes a threaded section 1011 and a through-hole section 1012, which are interconnected and communicate with each other. The threaded section 1011 extends to one end of the nut body 11 and is used for threaded mating with the valve body 20, while the through-hole section 1012 extends to the other end of the nut body 11 and is used for mating with the connecting pipe 30. In this way, the connector nut 10 can achieve the connection effect between the connecting pipe 30 and the valve body 20.

[0033] Specifically, a connector 21 protrudes from the side of the valve body 20, with external threads on the connector 21 and internal threads on a portion of the inner wall of the connecting hole 101 (the inner wall of the threaded section 1011). The nut body 11 is fitted onto the outer circumference of the connector 21 through the threaded section 1011, and tightened through the engagement of the internal and external threads. The connector 21 has a first conical surface at one end, and the through-hole section 1012 has a second conical surface at one end near the threaded section 1011. The connector 30 has a flared end. During the tightening of the nut body 11 and the connector 21, the first and second conical surfaces engage to clamp the flared end, thus securing the connector 30 and simultaneously achieving a sealing effect. The other end of the connector 30, away from the flared end, extends from the nut body 11 through the through-hole section 1012 for connection to an external pipeline.

[0034] Since cracks typically first appear at the ends of the nut body 11 during tightening, in one embodiment, to reduce the probability of stress cracking at the ends of the nut body 11, the connector nut 10 further includes a reinforcing structure 12. The reinforcing structure 12 is connected to the end of the nut body 11 along its axial direction and protrudes beyond the outer periphery of the corresponding end of the nut body 11. Thus, by providing a reinforcing structure 12 at the end of the nut body 11 and making it protrude beyond the outer periphery of the nut body 11, the structural strength of the end of the nut body 11 can be effectively improved. This reduces the probability of stress cracking at the ends of the nut body 11 during tightening with a wrench or similar tool, greatly improving the reliability of the connector nut 10 and ensuring a secure connection between the connector nut 10 and the connecting pipe 30 and the valve body 20.

[0035] Here, the two ends of the nut body 11 along its own axial direction are defined as the first end and the second end, respectively. For ease of explanation, the end of the nut body 11 connected to the valve body 20 can be defined as the first end, and the end of the nut body 11 connected to the connecting pipe 30 can be defined as the second end. That is, the threaded section 1011 passes through the first end, and the through hole section 1012 passes through the second end. Of course, the end of the nut body 11 connected to the valve body 20 can also be defined as the second end, and the end of the nut body 11 connected to the connecting pipe 30 can be defined as the first end. The specific setting can be reasonably set according to actual needs.

[0036] Optionally, such as Figure 2 As shown, there is one reinforcing structure 12, and the reinforcing structure 12 is connected to the first end. In this way, the structural strength of the end where the nut body 11 is connected to the valve body 20 can be guaranteed, and the probability of cracks forming from that point can be reduced.

[0037] Optionally, such as Figure 3As shown, there is one reinforcing structure 12, and the reinforcing structure 12 is connected to the second end. In this way, the structural strength of the end where the nut body 11 is connected to the connecting pipe 30 can be guaranteed, and the probability of cracks forming from that point can be reduced.

[0038] Optionally, such as Figure 4 and Figure 5 As shown, there are two reinforcing structures 12, and the two reinforcing structures 12 are respectively connected to opposite ends of the nut body 11 along its own axial direction. That is, both the first and second ends of the nut body 11 are provided with reinforcing structures 12, which can effectively ensure the strength of the nut body 11 and reduce the probability of crack formation.

[0039] Typically, to facilitate the engagement of the nut body 11 with the wrench, the outer peripheral wall of the nut body 11 is designed as a regular hexagonal structure, with the internal thread formed inside the regular hexagonal portion. Thus, at the center of each face of the regular hexagon, the thickness of the nut body 11 is minimal. Therefore, in order to prevent the nut body 11 from deforming and cracking, the wall thickness between the outer wall and the major diameter of the internal thread at this point is an important factor affecting the ultimate stress of the nut body 11.

[0040] Taking a standard DN8 nut (Diameter Nominal, i.e., a nut with a nominal diameter of 8mm) as an example, according to the torque calculation formula T=k×d×F, where T is the tightening torque, k is the torque coefficient, d is the single-sided wall thickness of the nut, and F is the axial force. Here, this embodiment adds a reinforcing structure 12 to the DN8 nut, and the axial force that the DN8 nut can withstand can be defined as F(max), and the tightening torque that it can withstand can be defined as T(max). Therefore, we can obtain d(min)=T(max) / (k×F(max)), where d(min) is the wall thickness of the nut body 11 at the major diameter of the internal thread in this embodiment.

[0041] Based on this, the axial height of the nut body 11 is defined as L, and the cross-sectional area of ​​the reinforcing structure 12 is defined as S, where S = d(min) × L. That is, in this embodiment, the joint nut 10 is equipped with the reinforcing structure 12, and by controlling the cross-sectional area of ​​the reinforcing structure 12, the strength of the reinforcing structure 12 can be guaranteed, which is beneficial to improve the strength of the nut body 11 at a specific location and reduce the probability of cracking.

[0042] For example, taking a traditional DN8 nut with a reinforced structure 12 having a cross-sectional width and height of 2mm as a reference, the nut body 11 in this embodiment can have its wall thickness reduced by 8% compared to the original. In order to compensate for the strength effect of the reduced wall thickness, the width of the reinforced structure 12 can be increased by 13% and the thickness can be increased by 5%.

[0043] It should be noted that the cross-sectional width of the reinforcing structure 12 is the radial width along the nut body 11, and the cross-sectional height of the reinforcing structure 12 is the axial height along the nut body 11. The wall thickness of the nut body 11 refers to the equivalent wall thickness.

[0044] In one embodiment, the projection of the outer periphery of the end of the nut body 11 along the axial direction of the nut body 11 lies within the outer periphery of the corresponding reinforcing structure 12. Here, the corresponding reinforcing structure 12 refers to the reinforcing structure 12 connected to the corresponding end. For example, the outer periphery of the reinforcing structure 12 connected to the first end can cover the outer periphery of the first end of the nut body 11, and the outer periphery of the reinforcing structure 12 connected to the second end can cover the outer periphery of the second end of the nut body 11. This ensures that the reinforcing structure 12 covers the nut body 11, thereby increasing the strength in the entire circumferential direction and reducing the probability of cracking in the nut body 11.

[0045] In one embodiment, such as Figure 2 As shown, the reinforcing structure 12 is connected to the end of the nut body 11 along the axial direction. This facilitates the installation of the reinforcing structure 12, thereby ensuring its reinforcing effect.

[0046] Furthermore, the reinforcing structure 12 is annular and coaxially arranged with the connecting hole 101. The inner diameter of the reinforcing structure 12 is larger than the inner diameter of the connecting hole 101 to avoid the reinforcing structure 12 from obstructing the connection of the connector 21 or the pipe 30, thereby ensuring the connection efficiency of the connector nut 10 and reducing the probability of interference between the connected components.

[0047] In another embodiment, such as Figure 3 As shown, the outer peripheral wall of the end of the nut body 11 protrudes in a direction away from the axis of the nut body 11 to form a reinforcing structure 12, which can also achieve the same reinforcing effect.

[0048] In one embodiment, the reinforcing structure 12 and the nut body 11 are integrally formed, thereby ensuring the strength of the connection between the reinforcing structure 12 and the nut body 11 and improving the overall reliability of the joint nut 10.

[0049] This application also provides a shut-off valve 100, which includes a valve body 20, a connecting pipe 30, and a connector nut 10 of any of the above embodiments, wherein the connecting pipe 30 is connected to the valve body 20 through the connector nut 10.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A connector nut for mounting a connecting pipe (30) to the valve body (20) of a gate valve, characterized in that, The connector nut includes a nut body (11) and a reinforcing structure (12). The nut body (11) has a connecting hole (101) that passes through both ends of the nut body (11) in the axial direction. The connecting hole (101) is provided with a threaded structure for connecting with the pipe (30) and the valve body (20). The reinforcing structure (12) is connected to the end of the nut body (11) along its own axial direction, and the reinforcing structure (12) protrudes from the outer periphery of the corresponding end of the nut body (11).

2. The connector nut according to claim 1, characterized in that, The inner wall of the connecting hole (101) is provided with an internal thread, the wall thickness of the nut body (11) at the major diameter of the internal thread is d (min), the height of the nut body (11) along the axial direction is L, and the cross-sectional area of ​​the reinforcing structure (12) is S, where S = d (min) × L.

3. The connector nut according to claim 1, characterized in that, The outer peripheral wall of the end of the nut body (11) protrudes in a direction away from the axis of the nut body (11) to form the reinforcing structure (12).

4. The connector nut according to claim 1, characterized in that, The reinforcing structure (12) is connected to the end of the nut body (11) along the axial direction of the nut body (11).

5. The connector nut according to claim 4, characterized in that, The reinforcing structure (12) is annular and is coaxially arranged with the connecting hole (101). The inner diameter of the reinforcing structure (12) is larger than the inner diameter of the connecting hole (101).

6. The connector nut according to claim 1, characterized in that, The connecting hole (101) includes a threaded section (1011) and a through-hole section (1012), the threaded section (1011) and the through-hole section (1012) being interconnected and communicating with each other; The threaded section (1011) extends to one end of the nut body (11) and is used to thread into the valve body (20), while the through-hole section (1012) extends to the other end of the nut body (11) and is used to connect with the connecting pipe (30).

7. The connector nut according to claim 1, characterized in that, The reinforcing structure (12) and the nut body (11) are integrally formed.

8. The joint nut according to any one of claims 1-7, characterized in that, The two ends of the nut body (11) along its own axial direction are defined as the first end and the second end, and the number of the reinforcing structure (12) is one, and the reinforcing structure (12) is connected to the first end or the second end.

9. The joint nut according to any one of claims 1-7, characterized in that, The number of the reinforcing structures (12) is two, and the two reinforcing structures (12) are respectively connected to the opposite ends of the nut body (11) along its own axial direction.

10. A shut-off valve, characterized in that, It includes a valve body (20), a connecting pipe (30), and a connector nut as described in any one of claims 1 to 9, wherein the connecting pipe (30) is connected to the valve body (20) via the connector nut.

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