Leakage-proof valve rod nut

Abstract

The utility model relates to a leakproof valve stem nut, which relates to the technical field of valve stem nuts, and comprises a nut body, a through hole is arranged on the nut body, a transmission thread is arranged on the inner circumferential surface of the nut body, the thread form of the transmission thread is trapezoidal, a fixed thread is arranged on the outer circumferential surface of the nut body, and the fixed thread is provided with a through hole. A first mounting groove is formed in the nut body, and a first sealing gasket is arranged in the first mounting groove. The fixing threads used for being in threaded connection with the valve body are arranged on the nut body, the first sealing gasket is arranged on the portion, making contact with the valve body, of the nut body, and therefore the sealing performance between the nut and the valve body is enhanced.

Description

Technical Field

[0001] This application relates to the field of valve stem nut technology, and more particularly to a leak-proof valve stem nut. Background Technology

[0002] The valve stem nut is a key component that enables a valve to open and close, and its structural reliability has a significant impact on the quality of the valve. When the valve closing element is driven to open or close, the valve stem nut transmits torque, converting the rotational motion of the handwheel or electric actuator into the lifting and lowering motion of the valve stem.

[0003] Currently, a Chinese utility model patent application with publication date of December 6, 2022, and publication number CN217977678U, discloses a long-life, high-load-bearing valve stem nut. It includes a base, with a bottom cylinder and a top block sequentially arranged at the top of the base. A slotted structure is formed in the middle of the base and bottom cylinder, and an internal thread is provided within the slotted structure. It is composed of a steel base and a copper alloy layer. This steel-based composite bimetallic valve stem nut combines the strength and excellent comprehensive mechanical properties of high-quality carbon steel or high-temperature resistant steel with the excellent anti-friction properties of copper alloy through a special process, forming a bimetallic composite material. Because it combines the steel base nut body with the molten copper alloy internal thread or inner sleeve layer, it eliminates casting defects such as porosity, sand holes, and looseness in the original copper alloy, and increases the density of the low-strength copper alloy, thereby improving its comprehensive mechanical properties such as strength and wear resistance.

[0004] In related technologies, the anti-leakage valve stem nut has a rotatable connection between its base and the valve body, and the part of the base that contacts the valve body is not treated to prevent leakage. When the valve is working, the fluid flowing inside the valve may leak out of the valve body from the part of the base that contacts the valve body, which reduces the overall sealing performance of the valve. Utility Model Content

[0005] This application provides a leak-proof valve stem nut, which can improve the technical problem of easy leakage at the connection between the valve stem nut and the valve body in related technologies.

[0006] This application provides a leak-proof valve stem nut, comprising: a nut body, a through hole on the nut body, a transmission thread on the inner circumferential surface of the nut body, the transmission thread having a trapezoidal tooth profile, a fixing thread on the outer circumferential surface of the nut body, and a first mounting groove on the nut body, wherein a first sealing gasket is disposed inside the first mounting groove.

[0007] The technical solutions described above in this application embodiment have at least the following technical effects: the transmission thread is used for transmission connection with the valve stem. After the valve stem is turned, the transmission thread converts the rotational force of the valve stem into an axial force to make the valve stem move axially. The valve stem nut is connected to the valve body threadedly through the fixing thread. Compared with the rotational connection with the valve body, the sealing performance is increased, and the fluid in the valve body is prevented from leaking from the contact part between the valve stem nut and the valve body. The first sealing gasket can further enhance the sealing performance of the contact part between the valve stem nut and the valve body.

[0008] The anti-leakage valve stem nut provided in this application embodiment has a fixing thread on the nut body for threaded connection with the valve body, and a first sealing gasket is provided at the contact point between the nut body and the valve body, thereby enhancing the sealing performance between the nut and the valve body.

[0009] In some embodiments, a second mounting groove is provided on the nut body, and a second sealing gasket is provided inside the second mounting groove.

[0010] In some embodiments, a third mounting groove is provided on the nut body, and a third sealing gasket is provided inside the third mounting groove.

[0011] In some embodiments, a fourth mounting groove is provided on the nut body, and a fourth sealing gasket is provided inside the fourth mounting groove.

[0012] In some embodiments, there are two fourth mounting slots, and each fourth mounting slot is provided with a fourth sealing gasket.

[0013] In some embodiments, the end of the nut body away from the fixing thread is a hexagon. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 A schematic diagram of the overall structure of a leak-proof valve stem nut provided in this application embodiment. Figure 1 ;

[0016] Figure 2 A cross-sectional view of a leak-proof valve stem nut provided in an embodiment of this application;

[0017] Figure 3 for Figure 2 Enlarged view of part A;

[0018] Figure 4 for Figure 2Enlarged view of part B;

[0019] Figure 5 for Figure 2 Enlarged view of part C.

[0020] The following are the labeling elements in the figure:

[0021] 1. Nut body; 11. First mounting groove; 12. Second mounting groove; 13. Third mounting groove; 14. Fourth mounting groove; 15. Through hole; 16. Transmission thread; 17. Fixing thread; 2. First sealing gasket; 3. Second sealing gasket; 4. Third sealing gasket; 5. Fourth sealing gasket. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] 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 or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[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 one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0029] The valve stem nut is a key component that enables a valve to open and close, and its structural reliability has a significant impact on the quality of the valve. When the valve closing element is driven to open or close, the valve stem nut transmits torque, converting the rotational motion of the handwheel or electric actuator into the lifting and lowering motion of the valve stem.

[0030] The related technology of anti-leakage valve stem nut, with publication number CN217977678U, includes a base, a bottom cylinder and a top block arranged sequentially at the top of the base, and a hollow groove structure with internal threads in the middle of the base and bottom cylinder. It is composed of a steel base and a copper alloy layer. This steel-based composite bimetallic valve stem nut combines the strength and good comprehensive mechanical properties of high-quality carbon steel or high-temperature resistant steel with the good anti-friction properties of copper alloy through a special process, forming a bimetallic composite material. Because it combines the steel base nut body with the molten copper alloy internal thread or inner sleeve layer, it eliminates casting defects such as porosity, sand holes, and looseness in the original copper alloy, and increases the density of the low-strength copper alloy, thereby improving its comprehensive mechanical properties such as strength and wear resistance.

[0031] However, in the related technology, the anti-leakage valve stem nut has a rotating connection between its base and the valve body, and the part of the base that contacts the valve body is not treated to prevent leakage. When the valve is working, the fluid flowing inside the valve may leak out of the valve body from the part of the base that contacts the valve body, which reduces the overall sealing performance of the valve.

[0032] Based on this, in order to improve the problems in the related technologies, the embodiments of this application provide the following solutions.

[0033] Please refer to the following: Figures 1 to 5 This application provides a leak-proof valve stem nut, including a nut body 1, a through hole 15 on the nut body 1, a transmission thread 16 on the inner circumferential surface of the nut body 1, the transmission thread 16 having a trapezoidal tooth profile, a fixing thread 17 on the outer circumferential surface of the nut body 1, and a first mounting groove 11 on the nut body 1, with a first sealing gasket 2 disposed inside the first mounting groove 11.

[0034] As can be seen from the above, the anti-leakage valve stem nut provided in this application embodiment has a transmission thread 16 for transmission connection with the valve stem. After the valve stem is turned, the transmission thread 16 converts the rotational force of the valve stem into an axial force, causing the valve stem to move axially, thereby driving the valve to open or close. The valve stem nut is threadedly connected to the valve body through the fixing thread 17, which increases the sealing performance compared to the rotational connection with the valve body, preventing fluid in the valve body from leaking from the contact part between the valve stem nut and the valve body. The first sealing gasket 2 can further enhance the sealing performance of the contact part between the valve stem nut and the valve body.

[0035] In some embodiments, please refer to the following: Figures 1 to 4 The nut body 1 has a second mounting groove 12, and a second sealing gasket 3 is provided inside the second mounting groove 12.

[0036] With this configuration, when the valve stem nut is connected to the valve body, the second sealing gasket 3 abuts against the valve body to form a seal. When the first sealing gasket 2 and the fixing thread 17 fail to seal properly, causing fluid in the valve body to leak from the part of the nut body 1 that contacts the valve body, the second sealing gasket 3 can prevent the fluid from continuing to leak out of the valve body.

[0037] Optionally, in some embodiments, please refer to Figures 1 to 3 The nut body 1 has a third mounting groove 13, and a third sealing gasket 4 is provided inside the third mounting groove 13.

[0038] With this configuration, when the valve stem is turned to the highest position, the valve is fully opened. The part of the valve stem inside the through hole 15 abuts against the third sealing gasket 4 to form a seal. Since the valve is fully open at this time, the fluid pressure inside the valve body is relatively high, and leakage is more likely to occur. If the fluid inside the valve leaks from the transmission thread 16 into the through hole 15, the third sealing gasket 4 can block the fluid and prevent the fluid from continuing to leak to the top of the through hole 15.

[0039] Optionally, please refer to Figures 1 to 3 The nut body 1 has a fourth mounting groove 14, and a fourth sealing gasket 5 is provided inside the fourth mounting groove 14.

[0040] With this configuration, since the valve stem and the top of the inner circumferential surface of the nut body 1 are rotatably connected, the sealing performance is poor. The fourth sealing gasket 5 can abut against the outer circumferential surface of the valve stem to form a seal. When the fourth sealing gasket 5 is not properly connected to the third sealing gasket 4 inside the through hole 15, causing the fluid in the valve body to leak into the through hole 15, the fourth sealing gasket 5 can prevent the fluid from continuing to leak to the top of the through hole 15.

[0041] In some embodiments, please refer to Figures 1 to 3 The fourth mounting groove 14 has two grooves, and each groove 14 is equipped with a fourth sealing gasket 5.

[0042] With this configuration, the two fourth sealing rings can further enhance the sealing between the inside of the nut body 1 and the valve stem.

[0043] Optionally, in some embodiments, please refer to Figure 1 and Figure 2 The end of the nut body 1 away from the fixing thread 17 is hexagonal.

[0044] This design allows workers to use a wrench to turn the valve stem nut, facilitating its installation and removal.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A leakage-proof valve stem nut, characterized in that: The invention comprises a nut body (1), wherein a through hole (15) is provided on the nut body (1), a transmission thread (16) is provided on the inner circumference of the nut body (1), and the tooth profile of the transmission thread (16) is trapezoidal, a fixing thread (17) is provided on the outer circumference of the nut body (1), and a first installation groove (11) is provided on the nut body (1), and a first sealing gasket (2) is arranged inside the first installation groove (11).

2. The anti-leakage valve stem nut according to claim 1, characterized in that: The nut body (1) is provided with a second installation groove (12), and a second sealing gasket (3) is arranged inside the second installation groove (12).

3. The anti-leakage valve stem nut according to claim 2, characterized in that: The nut body (1) is provided with a third installation groove (13), and a third sealing gasket (4) is arranged inside the third installation groove (13).

4. The anti-leakage valve stem nut according to any one of claims 1 to 3, characterized in that: The nut body (1) is provided with a fourth installation groove (14), and a fourth sealing gasket (5) is arranged inside the fourth installation groove (14).

5. The anti-leakage valve stem nut according to claim 4, characterized in that: There are two fourth installation grooves (14), and fourth sealing pads (5) are arranged inside each of the fourth installation grooves (14).

6. The anti-leakage valve stem nut according to claim 5, characterized in that: One end of the nut body (1) away from the fixing thread (17) is a hexagon.

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