Natural gas conveying pipeline leak detection device

Abstract

The utility model relates to the technical field of pipeline leak detection, in particular to a natural gas conveying pipeline leak detection device, which comprises an arc-shaped fixing piece I and an arc-shaped fixing piece II, one end of the arc-shaped fixing piece I is rotatably connected with one end of the arc-shaped fixing piece II through a hinge piece, and the other end of the arc-shaped fixing piece I is in threaded connection with the other end of the arc-shaped fixing piece II. A graduated tube is fixedly connected to one side of the second arc-shaped fixing part, a balance plug is slidably connected to the inner wall of the graduated tube, an air valve is fixedly connected to one end of the graduated tube, and a limiting plate is fixedly connected to the other end of the graduated tube. The sealing device has the beneficial effects that secondary sealing protection is carried out on the connecting position of the pipeline through the first arc-shaped fixing piece and the second arc-shaped fixing piece, meanwhile, the internal sealing and air leakage conditions can be known by observing the position of the balance plug, the overall sensitivity is high, and the air leakage condition can be limited and blocked when air leaks.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline leak detection, in particular to a leak detection device for natural gas transmission pipelines. Background Technique

[0002] A natural gas pipeline refers to a pipeline that transports natural gas (including associated gas produced in oil fields) from the production site or treatment plant to the urban gas distribution center or industrial enterprise users. It is also called a gas transmission pipeline. Using natural gas pipelines to transport natural gas is a way to transport large amounts of natural gas on land. Among the total length of pipelines in the world, natural gas pipelines account for about half.

[0003] Chinese Patent CN216925950U discloses a leak detection device for gas transmission pipelines, including a gas transmission pipeline, a left arc-shaped detection seal and a right arc-shaped detection seal. The left arc-shaped detection seal and the right arc-shaped detection seal are both detachably sleeved outside the gas transmission pipeline, and leak detection components are arranged inside the left arc-shaped detection seal and the right arc-shaped detection seal; the leak detection component includes a leak detection piece, a leak detection plate and a leak detection balloon, and ventilation holes are equidistantly arranged inside the left arc-shaped detection seal and the right arc-shaped detection seal. The utility model belongs to the technical field of pipeline leak detection, and specifically provides a leak detection device for gas transmission pipelines with a simple structure, convenient use, applicable to gas transmission pipelines of different diameters for leak detection, accurate to the leak location for repair, small volume, high stability, simple leak detection process, and effectively improving the leak detection efficiency.

[0004] However, the above patent uses a balloon to detect air leakage. The balloon itself has low sensitivity to detecting leakage, and when there is air leakage at the pipeline connection, it is impossible to block the leakage point. Therefore, the utility model proposes a leak detection device for natural gas transmission pipelines to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a leak detection device for natural gas transmission pipelines to solve the problems of low detection sensitivity and inability to limit air leakage proposed in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A leak detection device for natural gas transmission pipelines, including: a first arc-shaped fixing piece and a second arc-shaped fixing piece. One end of the first arc-shaped fixing piece is rotatably connected to one end of the second arc-shaped fixing piece through a hinge piece. The other end of the first arc-shaped fixing piece is threadedly connected to the other end of the second arc-shaped fixing piece. A scale tube is fixedly connected to one side of the second arc-shaped fixing piece. A balance plug is slidably connected to the inner wall of the scale tube. One end of the scale tube is fixedly connected to a valve, and the other end is fixedly connected to a limiting plate

[0007] Preferably, sealing gaskets are respectively fixedly connected to the inner arcs on both sides of the first arc-shaped fixing member and the second arc-shaped fixing member. One side of the sealing gasket is closely connected to the first pipeline and the second pipeline. Flange plates are fixedly connected to one ends of the first pipeline and the second pipeline. The flange plates are threadedly connected through fixing bolts and nuts.

[0008] Preferably, threaded holes are provided at one ends of the first arc-shaped fixing member and the second arc-shaped fixing member, and they are threadedly connected through fixing bolts and nuts.

[0009] Preferably, air holes are provided on the surface of the second arc-shaped fixing member and the limiting plate, and a sealing plug is closely connected to the air holes on the surface of the second arc-shaped fixing member.

[0010] Preferably, both the first arc-shaped fixing member and the second arc-shaped fixing member are in a hollow semi-circular shape and a fixing plate is welded to one end. Threaded holes are provided on the fixing plate. The first arc-shaped fixing member and the second arc-shaped fixing member are placed symmetrically.

[0011] Preferably, sealing gaskets are provided at the joints of the first arc-shaped fixing member and the second arc-shaped fixing member. The graduated tube is in a transparent tubular shape and has graduations on its surface.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: By enabling the first arc-shaped fixing member and the second arc-shaped fixing member to perform secondary sealing protection on the pipeline connection, and at the same time, the internal sealing and air leakage conditions can be known by observing the position of the balance plug. The overall sensitivity is high, and when there is air leakage, the air leakage situation can be restricted and blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the connection of the flange plates of the present utility model;

[0015] Figure 3 is a schematic diagram of the inside of the second arc-shaped fixing member of the present utility model;

[0016] Figure 4 is a schematic cross-sectional view of the graduated tube of the present utility model.

[0017] In the figure: 1. First pipeline; 2. Second pipeline; 3. Flange plate; 4. Fixing bolt; 5. Nut; 6. Sealing gasket; 7. First arc-shaped fixing member; 8. Second arc-shaped fixing member; 9. Hinge member; 10. Air hole; 11. Sealing plug; 12. Graduated tube; 13. Limiting plate; 14. Balance plug; 15. Air valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to clearly and completely describe the purpose, technical solution of the present utility model and make the advantages more clearly understood, the following further details the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present utility model, rather than all of the embodiments, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0019] Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a natural gas pipeline leak detection device, including: an arc-shaped fixing member 7 and an arc-shaped fixing member 8. For the convenience of sealing, both the arc-shaped fixing member 7 and the arc-shaped fixing member 8 are provided as hollow semi-circular shapes, and one end is welded with a fixing plate, and the fixing plate is provided with threaded holes. The arc-shaped fixing member 7 and the arc-shaped fixing member 8 are threadedly connected through fixing bolts 4 and nuts 5, making their connection tight. The arc-shaped fixing member 7 and the arc-shaped fixing member 8 are symmetrically placed, which is convenient for secondary sealing protection of the pipeline interface. The other end of the arc-shaped fixing member 7 is rotatably connected to the other end of the arc-shaped fixing member 8 through a hinge member 9, which is convenient for opening, closing and disassembling.

[0020] Sealing gaskets 6 are respectively fixedly connected to the inner arc portions on both sides of the arc-shaped fixing member 7 and the arc-shaped fixing member 8. One side of the sealing gasket 6 is closely connected to a pipeline 1 and a pipeline 2. When the arc-shaped fixing member 7 and the arc-shaped fixing member 8 are connected together, the sealing gasket 6 can seal the connection part to prevent the gas inside the arc-shaped fixing member 7 and the arc-shaped fixing member 8 from leaking.

[0021] Flange plates 3 are fixedly connected to one end of each of the pipeline 1 and the pipeline 2. The flange plates 3 have good sealing performance and are relatively easy to disassemble. The flange plates 3 are threadedly connected through fixing bolts 4 and nuts 5 to avoid air leakage at the connection part of the pipeline 1 and the pipeline 2. An air hole 10 is provided on the surface of the arc-shaped fixing member 8. After the equipment is installed, the inside of the arc-shaped fixing member 7 and the arc-shaped fixing member 8 can be evacuated through the air hole 10 on the surface of the arc-shaped fixing member 2 to make it in a negative pressure state, or a gas detection device can be connected during maintenance, etc. A sealing plug 11 is closely connected to the air hole 10 on the surface of the arc-shaped fixing member 8 to ensure the negative pressure or vacuum state inside.

[0022] One side of the second arc-shaped fixing member 8 is fixedly connected to a scale tube 12. One end of the scale tube 12 is fixedly connected to a valve 15. By pumping air out of the scale tube 12 through the valve 15, the pressures at both ends of the balance plug 14 are made equal and in a stable state. A balance plug 14 is slidably connected to the inner wall of the scale tube 12. When the balance plug 14 moves, it can be known that there is an air leakage situation. The scale tube 12 is a transparent tube with scales on its surface, which is convenient for judging the size and rate of air leakage. The other end is fixedly connected to a limiting plate 13. The surface of the limiting plate 13 is provided with air holes 10, so that the air pressure on one side of the balance plug 14 is the same as the air pressure inside the second arc-shaped fixing member 8. In order to avoid air leakage of the device itself, sealing gaskets 6 are provided at the joints of the first arc-shaped fixing member 7 and the second arc-shaped fixing member 8.

[0023] When the device works, first connect the first pipe 1 and the second pipe 2 tightly, which can provide a layer of protection for natural gas. Then, clamp the rotatably connected first arc-shaped fixing member 7 and the second arc-shaped fixing member 8 on the flange 3. Subsequently, tightly connect the other ends of the first arc-shaped fixing member 7 and the second arc-shaped fixing member 8 through the fixing bolts 4 and nuts 5. During this process, the sealing gasket 6 will be squeezed, thereby sealing the joint. Then, pump air out through the air holes 10 on the surface of the second arc-shaped fixing member 8 and the valve 15, so that the inside of the second arc-shaped fixing member 8 is in a negative pressure or vacuum state. At the same time, adjust the air pumping rate to make the balance plug 14 in the middle of the scale tube 12 and stable. When there is air leakage at the pipe joint, the air pressure inside the second arc-shaped fixing member 8 increases, and the balance plug 14 moves outwards. Thus, it can be judged whether the pipe leaks. Moreover, the first arc-shaped fixing member 7 and the second arc-shaped fixing member 8 themselves have a sealing effect on the pipe interface. Therefore, even if there is air leakage, it can be restricted and blocked, reducing the loss.

[0024] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas pipeline leak detection device, characterized in that: The natural gas pipeline leak detection device includes: an arc-shaped fixing piece one (7) and an arc-shaped fixing piece two (8). One end of the arc-shaped fixing piece one (7) is rotationally connected to one end of the arc-shaped fixing piece two (8) through a hinge piece (9). The other end of the arc-shaped fixing piece one (7) is threadedly connected to the other end of the arc-shaped fixing piece two (8). One side of the arc-shaped fixing piece two (8) is fixedly connected with a scale tube (12). A balance plug (14) is slidably connected to the inner wall of the scale tube (12). One end of the scale tube (12) is fixedly connected with a valve (15), and the other end is fixedly connected with a limiting plate (13).

2. The leak detection device for a natural gas transmission pipeline according to claim 1, characterized in that: Sealing gaskets (6) are respectively fixedly connected to the inner arc parts on both sides of the arc-shaped fixing piece one (7) and the arc-shaped fixing piece two (8). One side of the sealing gasket (6) is closely connected with a pipeline one (1) and a pipeline two (2). Flange plates (3) are fixedly connected to one ends of the pipeline one (1) and the pipeline two (2).

3. The leak detection device for a natural gas transmission pipeline according to claim 1, wherein: Threaded holes are provided at one ends of the arc-shaped fixing piece one (7) and the arc-shaped fixing piece two (8), and are threadedly connected through fixing bolts (4) and nuts (5).

4. The leak detection device for a natural gas transmission pipeline according to claim 1, wherein: Air holes (10) are provided on the surface of the arc-shaped fixing piece two (8) and the limiting plate (13). A sealing plug (11) is closely connected to the air hole (10) on the surface of the arc-shaped fixing piece two (8).

5. The leak detection device for a natural gas transmission pipeline according to claim 1, wherein: Both the arc-shaped fixing piece one (7) and the arc-shaped fixing piece two (8) are hollow semi-circular and one end is welded with a fixing plate. Threaded holes are provided on the fixing plate. The arc-shaped fixing piece one (7) and the arc-shaped fixing piece two (8) are symmetrically placed.

6. The leak detection device for a natural gas transmission pipeline according to claim 1, wherein: Sealing gaskets (6) are provided at the connection parts of the arc-shaped fixing piece one (7) and the arc-shaped fixing piece two (8). The scale tube (12) is a transparent tube and has scales on its surface.

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