Natural gas buried earth valve lockout device

Abstract

The utility model discloses a natural gas buried earth valve lock closing device, including valve stem and the valve stem protection sleeve pipe of setting up on valve stem, be provided with the expansion pipe on the valve stem protection sleeve pipe, the fixed ring is fixed in the expansion pipe inside, the fixed ring sets up on the valve stem, just the inside diameter of fixed ring gradually reduces from top to bottom, be provided with a plurality of the wedge board that is the circumferential distribution between fixed ring and valve stem, through the combination structure of "fixed ring - wedge board - pressure ring", realize the bidirectional locking of valve stem, when the rotary adjusting nut presses down the movable plate, movable rod drives pressure ring to move down, make the wedge board along the taper inner wall of fixed ring and tighten inwards, utilize the slope extrusion principle of wedge structure, firmly fix valve stem, can limit the circumferential rotation of valve stem, can also prevent its axial movement, compared with traditional single point locking mode, locking force distribution is more even, and the anti -force destruction ability is improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of natural gas transmission technology, and in particular to a natural gas buried earth valve locking device. Background Technology

[0002] Natural gas, as a clean energy source, occupies a core position in urban energy supply and industrial production. Its transportation mainly relies on buried pipeline systems, and buried earth valves, as key nodes in the pipeline network, undertake important functions such as controlling gas flow, regulating pressure, and isolating pipeline sections. However, due to the flammable, explosive, colorless, and odorless characteristics of natural gas, if the valve is misoperated or operated without authorization, it may cause serious safety accidents such as gas leaks, explosions, and fires, causing incalculable losses to the lives and property of surrounding people and the ecological environment. At the same time, natural gas pipelines often pass through densely populated areas, commercial areas, and industrial areas. Improper valve operation may lead to regional gas supply interruptions, affecting residents' daily lives, normal production of enterprises, and even causing public safety incidents.

[0003] In addition, natural gas underground valves are usually buried underground for a long time and lack real-time human supervision. In external operation scenarios such as construction and municipal maintenance, if operators accidentally touch the valves, it is easy to trigger safety hazards. On the other hand, natural gas transmission systems must follow strict safety management standards and implement hierarchical control over the operation authority of key valves to ensure the standardization and traceability of operation procedures.

[0004] Therefore, a natural gas buried earth valve locking device is proposed to address the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a natural gas buried earth valve locking device to solve the problem mentioned in the background art, which is that once the valve is misoperated or operated without authorization, it may cause serious safety accidents such as gas leakage, explosion, and fire, causing incalculable losses to the lives and property of surrounding people and the ecological environment.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a natural gas buried earth valve locking device, comprising:

[0008] A valve stem and a valve stem protective sleeve fitted on the valve stem. An expansion tube is provided on the valve stem protective sleeve. A fixing ring is fixed inside the expansion tube. The fixing ring is fitted on the valve stem, and its inner diameter gradually decreases from top to bottom. Multiple circumferentially distributed wedge plates are provided between the fixing ring and the valve stem. The thickness of the wedge plates gradually decreases from top to bottom. A pressure ring is fixedly connected to the top of each wedge plate. Multiple circumferentially distributed movable rods are fixedly connected to the top of the pressure ring. The top of each movable rod passes through the expansion tube and is connected to a movable plate. Fixing ears are provided on both sides of the expansion tube near the top. An adjusting screw is fixedly connected to the top of each fixing ear. The top of the adjusting screw passes through the movable plate. An adjusting nut is threaded onto the adjusting screw above the movable plate. The bottom end of the adjusting nut is connected to the movable plate via a bearing. A padlock hole is provided on the adjusting screw.

[0009] Furthermore, a connecting block is fixedly connected between the fixing ring and the inner wall of the expansion tube, and the connecting block is evenly distributed circumferentially.

[0010] Furthermore, a guide hole is provided at the top of the expansion tube at a position corresponding to the movable rod, and the movable rod passes through the guide hole.

[0011] Furthermore, a sealing ring is provided on the inner wall of the guide hole, and the sealing ring slides against the outer wall of the movable rod.

[0012] Furthermore, a through hole is provided on the movable plate at the position corresponding to the adjusting screw, and the adjusting screw passes through the through hole.

[0013] Furthermore, a central hole is provided at the center of the movable plate, and the valve stem protective sleeve passes through the central hole.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] This invention achieves bidirectional locking of the valve stem through a combination structure of "fixed ring-wedge plate-pressure ring". When the rotating adjusting nut presses down the movable plate, the movable rod drives the pressure ring to move down, causing the wedge plate to tighten inward along the conical inner wall of the fixed ring. By utilizing the inclined surface extrusion principle of the wedge structure, the valve stem is firmly fixed, which can restrict the circumferential rotation of the valve stem and prevent its axial movement. Compared with the traditional single-point locking method, the locking force distribution is more uniform and the resistance to external damage is significantly improved.

[0016] Based on the aforementioned beneficial effects, the tight fit between the pressure ring, the movable rod, and the expansion tube, along with the design of the padlock hole at the top of the adjusting screw, achieves mechanical locking while forming a multi-layered sealing protection. The padlock hole, used in conjunction with a padlock, prevents unauthorized personnel from arbitrarily adjusting the nut. The overall structure of the device is compact, effectively reducing the risk of external media such as soil and moisture entering the valve stem protective sleeve, and meeting the corrosion resistance and waterproof requirements in buried environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the movable plate of this utility model;

[0021] Figure 4 This is a cross-sectional view of the expansion tube of this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the expansion tube of this utility model.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Valve stem; 2. Valve stem protective sleeve; 3. Expansion tube; 4. Fixing ring; 5. Wedge plate; 6. Pressure ring; 7. Movable rod; 8. Movable plate; 9. Fixing lug; 10. Adjusting screw; 11. Adjusting nut; 12. Padlock hole; 13. Connecting block; 14. Guide hole; 15. Sealing ring; 16. Through hole; 17. Center hole. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 5As shown, this utility model provides a natural gas buried earth valve locking device, including a valve stem 1 and a valve stem protective sleeve 2 sleeved on the valve stem 1. An expansion tube 3 is provided on the valve stem protective sleeve 2, and a fixing ring 4 is fixed inside the expansion tube 3. The fixing ring 4 is sleeved on the valve stem 1, and its inner diameter gradually decreases from top to bottom. Multiple circumferentially distributed wedge plates 5 are provided between the fixing ring 4 and the valve stem 1, with the thickness of the wedge plates 5 gradually decreasing from top to bottom. A pressure ring 6 is fixedly connected to the top of the wedge plates 5, and multiple circumferentially distributed movable rods 7 are fixedly connected to the top of the pressure ring 6. The top of each movable rod 7 passes through the expansion tube 3 and is connected to a movable plate 8. Fixing ears 9 are provided on both sides of the expansion tube 3 near the top, and adjusting screws are fixedly connected to the top of each fixing ear 9. 10. The top end of the adjusting screw 10 passes through the movable plate 8. The adjusting screw 10 above the movable plate 8 is threaded with an adjusting nut 11. The bottom end of the adjusting nut 11 is connected to the movable plate 8 through a bearing. The adjusting screw 10 has a padlock hole 12. Through the combination structure of "fixed ring 4-wedge plate 5-pressure ring 6", the valve stem 1 is locked in both directions. When the adjusting nut 11 is rotated to press down the movable plate 8, the movable rod 7 drives the pressure ring 6 to move down, causing the wedge plate 5 to tighten inward along the conical inner wall of the fixed ring 4. By using the inclined extrusion principle of the wedge structure, the valve stem 1 is firmly fixed, which can restrict the circumferential rotation of the valve stem 1 and prevent its axial movement. Compared with the traditional single-point locking method, the locking force distribution is more uniform and the resistance to external damage is significantly improved.

[0029] Specifically, a connecting block 13 is fixedly connected between the fixing ring 4 and the inner wall of the expansion tube 3. The connecting blocks 13 are evenly distributed in the circumference and are used to fix the expansion tube 3 and the fixing ring 4.

[0030] Furthermore, a guide hole 14 is provided at the top of the expansion tube 3 at the position corresponding to the movable rod 7. The movable rod 7 passes through the guide hole 14 for displacement of the movable rod 7.

[0031] Furthermore, a sealing ring 15 is provided on the inner wall of the guide hole 14. The sealing ring 15 slides against the outer wall of the movable rod 7 to enhance the sealing performance.

[0032] It is worth noting that a through hole 16 is provided on the movable plate 8 at the position corresponding to the adjusting screw 10, and the adjusting screw 10 passes through the through hole 16.

[0033] It is worth noting that a central hole 17 is provided at the center of the movable plate 8, and the valve stem protective sleeve 2 passes through the central hole 17.

[0034] Working principle: The valve stem protective sleeve 2 is fitted onto the outside of the cylindrical valve stem 1, ensuring that the position of the expansion tube 3 corresponds to the section of the valve stem 1 that needs to be locked. At this time, the fixing ring 4 is embedded inside the expansion tube 3, and its inner diameter tapers from top to bottom. The wedge plates 5 are evenly distributed around the circumference of the fixing ring, and the top of the wedge plates 5 is welded and fixed to the pressure ring 6. The movable rod 7 is vertically fixed to the upper surface of the pressure ring 6. Pushing the movable plate 8 causes the movable rod 7 to move the pressure ring 6 and the wedge plates 5 downwards until the lower edge of the fixing ring 4 is aligned with the part of the valve stem 1 that needs to be locked. At this time, the wedge plates 5 and the surface of the valve stem 1 are kept 2-3mm apart. The gap ensures that the valve stem 1 can rotate freely or move axially. Rotating the adjusting nut 11 clockwise generates a downward axial force, which pushes the movable plate 8 down along the adjusting screw 10. The movable plate 8 drives the movable rod 7 to press down synchronously. After the pressure ring 6 is subjected to force, it pushes the wedge plate 5 to contract inward along the conical inner wall of the fixed ring 4. Since the inner diameter of the fixed ring 4 is larger at the top and smaller at the bottom, when the wedge plate 5 (thicker at the top and thinner at the bottom) moves down, its inner inclined surface gradually squeezes the surface of the valve stem 1, forming a uniform circumferential clamping force. When the adjusting nut 11 is tightened to the preset torque, the frictional torque between the wedge plate 5 and the valve stem 1 reaches the critical value, completely restricting the rotation and axial displacement of the valve stem 1. The padlock hole 12 at the top of the adjusting screw 10 is exposed on the upper surface of the movable plate 8. The padlock is passed through the padlock hole 12 and locked to prevent the adjusting nut 11 from loosening.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A natural gas buried earth valve locking device, characterized in that, include: A valve stem (1) and a valve stem protective sleeve (2) fitted on the valve stem (1). An expansion tube (3) is provided on the valve stem protective sleeve (2). A fixing ring (4) is fixed inside the expansion tube (3). The fixing ring (4) is fitted on the valve stem (1), and the inner diameter of the fixing ring (4) gradually decreases from top to bottom. Multiple circumferentially distributed wedge plates (5) are provided between the fixing ring (4) and the valve stem (1). The thickness of the wedge plates (5) gradually decreases from top to bottom. A pressure ring (6) is fixedly connected to the top of the wedge plates (5). A pressure ring (6) is fixedly connected to the top of the pressure ring (6). Multiple circumferentially distributed movable rods (7) are connected to a movable plate (8) through an expansion tube (3) at their top ends. Fixed ears (9) are provided on both sides of the expansion tube (3) near the top. An adjusting screw (10) is fixedly connected to the top of the fixed ear (9). The top end of the adjusting screw (10) passes through the movable plate (8). An adjusting nut (11) is threadedly connected to the adjusting screw (10) above the movable plate (8). The bottom end of the adjusting nut (11) is connected to the movable plate (8) through a bearing. A padlock hole (12) is provided on the adjusting screw (10).

2. The natural gas buried earth valve locking device according to claim 1, characterized in that: A connecting block (13) is fixedly connected between the fixed ring (4) and the inner wall of the expansion tube (3), and the connecting block (13) is evenly distributed in the circumferential direction.

3. The natural gas buried earth valve locking device according to claim 1, characterized in that: The top of the expansion tube (3) is provided with a guide hole (14) at the position corresponding to the movable rod (7), and the movable rod (7) passes through the guide hole (14).

4. The natural gas buried earth valve locking device according to claim 3, characterized in that: A sealing ring (15) is provided on the inner wall of the guide hole (14), and the sealing ring (15) slides against the outer wall of the movable rod (7).

5. A natural gas buried earth valve locking device according to claim 1, characterized in that: A through hole (16) is provided on the movable plate (8) at the position corresponding to the adjusting screw (10), and the adjusting screw (10) passes through the through hole (16).

6. A natural gas buried earth valve locking device according to claim 1, characterized in that: The movable plate (8) has a central hole (17) at its center, and the valve stem protective sleeve (2) passes through the central hole (17).

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