Detection and maintenance equipment for natural gas pipeline

Abstract

The utility model belongs to the technical field of natural gas detection equipment, and particularly relates to detection and maintenance equipment for natural gas pipelines, which comprises natural gas conveying pipes and connecting flanges, the connecting flanges are connected to the ends of the natural gas conveying pipes, and the natural gas conveying pipes are connected through the connecting flanges. The joint of the natural gas conveying pipe is movably covered with a sealing cover, the sealing cover comprises an upper cover shell and a lower cover shell, the upper cover shell is located above the lower cover shell, and arc-shaped pipe hoops are integrally formed on the surfaces of the two ends of the upper cover shell and the surfaces of the two ends of the lower cover shell; when the device is used, the leakage speed of natural gas can be increased under the action of negative pressure, the leaked natural gas is stored in the sealing cover and is not influenced by air, the purity of the natural gas in the sealing cover can be higher, and a small amount of natural gas leakage can be rapidly detected by the natural gas concentration monitor; the natural gas leakage detection precision is improved, and the natural gas leakage detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas detection equipment, in particular to a detection and maintenance equipment for natural gas pipelines. Background Art

[0002] A natural gas pipeline refers to a pipeline that transports natural gas (including associated gas produced in oil fields) from the mining site or processing plant to the urban gas distribution center or industrial enterprise users. It is also called a gas transmission pipeline. Using a natural gas pipeline to transport natural gas is a way to transport large quantities of natural gas on land. Natural gas pipeline transportation has the advantages of low transportation cost, small footprint, fast construction, large oil and gas transportation volume, high safety performance, small transportation loss, no "three wastes" emissions, low risk of leakage, low environmental pollution, little impact from severe weather, small equipment maintenance, easy management, and easy remote centralized monitoring. Natural gas pipelines are connected by flanges, and there is a risk of leakage at the connection.

[0003] Through patent search, it was found that the publication number: CN214467926U discloses a natural gas pipeline leakage monitoring device, including a natural gas transmission pipe, the outer ring of the natural gas transmission pipe is provided with a monitoring body, the inner side of the monitoring body is provided with a body inner groove, the inner side of the body inner groove is provided with a natural gas detector, the outer ring of the monitoring body is provided with a monitoring box, and the front end of the monitoring body is provided with a connecting plate. Through the setting of the signal generator, when the natural gas detector detects a natural gas leakage, the signal generator transmits a signal to the remote monitoring equipment, and the alarm system of the remote monitoring equipment sounds, thereby improving the staff to repair its natural gas transmission pipe. Moreover, through the setting of the signal generator, it is used together with the alarm and the alarm light to realize a double alarm reminder when natural gas leaks, thereby improving the effect of using the natural gas transmission pipeline leakage monitoring device.

[0004] The existing natural gas transmission pipeline leakage monitoring equipment monitors the leakage points at the pipeline connection during use. When the leakage point size is small, the leakage of natural gas is small. The natural gas is mixed with the air in the monitoring equipment to dilute the natural gas, resulting in a lower concentration of natural gas, which will affect the monitoring sensitivity of the natural gas concentration monitor. At the same time, the detection speed is slow. In order to solve the above problems, this application proposes a detection and maintenance equipment for natural gas pipelines. Utility Model Content

[0005] (I) Purpose of the utility model

[0006] In order to solve the technical problems existing in the background technology, the utility model proposes a detection and maintenance equipment for natural gas pipelines, which can accelerate the leakage speed of natural gas under the action of negative pressure. The leaked natural gas is stored in a sealed cover without the influence of air, so that the purity of the natural gas in the sealed cover can be higher. A small amount of natural gas leakage can be quickly detected by the natural gas concentration monitor, which not only improves the accuracy of natural gas leakage detection, but also improves the detection efficiency of natural gas leakage, so as to solve the problems raised in the background technology.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the utility model provides a detection and maintenance device for a natural gas pipeline, comprising a natural gas transmission pipe and a connecting flange, wherein the connecting flange is connected to the end of the natural gas transmission pipe, and the natural gas transmission pipes are connected to each other through the connecting flange, and a movable cover at the connection of the natural gas transmission pipe is provided with a sealing cover, wherein the sealing cover comprises an upper cover shell and a lower cover shell, and the upper cover shell is located above the lower cover shell;

[0009] The surfaces of both ends of the upper cover shell and the lower cover shell are integrally formed with arc-shaped pipe clamps, and the arc-shaped pipe clamps cover the surface of the natural gas transmission pipe;

[0010] A natural gas concentration monitor is installed on the upper surface of the upper cover shell, and a vacuum pump is provided on one side of the natural gas concentration monitor.

[0011] Preferably, the two groups of arc-shaped pipe clamps are spliced ​​into a circular structure, and the inner walls of the arc-shaped pipe clamps are provided with arc-shaped sealing rings, and the inner walls of the arc-shaped sealing rings abut against the surface of the natural gas transmission pipe.

[0012] Preferably, a negative pressure gauge is provided on one side of the natural gas concentration monitor, and the negative pressure gauge is conductively connected to the upper cover shell.

[0013] Preferably, a three-way pipe is provided on one side of the negative pressure gauge, the bottom of the three-way pipe is conductively connected to the upper cover shell, and the top of the three-way pipe is threadedly connected to a pressure relief valve.

[0014] Preferably, the middle portion of the three-way pipe is connected to the suction end of the vacuum pump through a pipeline.

[0015] Preferably, a rubber socket is fixedly connected to the lower surface of the upper cover shell, and a sealing socket groove is provided on the upper surface of the cavity wall of the lower cover shell at a position corresponding to the position of the rubber socket, and the rubber socket is plugged into the sealing socket groove.

[0016] Preferably, both side surfaces of the upper cover shell and the lower cover shell are integrally formed with fixing frames, and fixing bolts are inserted through the surface of the fixing frames.

[0017] The above technical solution of the utility model has the following beneficial technical effects:

[0018] 1. The utility model can extract the air in the sealing cover through a vacuum pump to make the sealing cover a vacuum state, and the negative pressure value in the sealing cover can be monitored by a negative pressure gauge. When a leak occurs at the connection of the natural gas transmission pipe, the leakage speed of the natural gas can be accelerated under the action of negative pressure, thereby improving the detection efficiency of the natural gas pipeline.

[0019] 2. In the utility model, since the sealing cover is in a vacuum state and there is no air, when the natural gas pipeline connection leaks, the leaked natural gas is stored in the sealing cover without the influence of air, so the purity of the natural gas in the sealing cover can be higher, and a small amount of natural gas leakage can be quickly detected by the natural gas concentration monitor, which not only improves the accuracy of natural gas leakage detection, but also improves the efficiency of natural gas leakage detection. After detection, the pressure relief valve can be opened to relieve the pressure on the sealing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a natural gas pipeline inspection and maintenance device according to the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of a natural gas pipeline inspection and maintenance device according to the utility model;

[0022] Figure 3 This is a schematic diagram of the natural gas transmission pipe connection structure of a natural gas pipeline detection and maintenance device of the utility model;

[0023] Figure 4 The utility model is a schematic diagram of the exploded structure of a sealing cover of a natural gas pipeline detection and maintenance device.

[0024] Reference numerals:

[0025] 1. Natural gas transmission pipe; 2. Connecting flange; 3. Sealing cover; 4. Upper cover shell; 5. Lower cover shell; 6. Arc-shaped pipe clamp; 7. Arc-shaped sealing ring; 8. Fixed bracket; 9. Natural gas concentration monitor; 10. Negative pressure gauge; 11. Three-way pipe; 12. Pressure relief valve; 13. Vacuum pump; 14. Rubber socket; 15. Sealing socket. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0027] like Figure 1-4As shown, the utility model proposes a natural gas pipeline inspection and maintenance equipment, including a natural gas transmission pipe 1 and a connecting flange 2, wherein the connecting flange 2 is connected to the end of the natural gas transmission pipe 1, and the natural gas transmission pipes 1 are connected to each other through the connecting flange 2, and the movable cover at the connection of the natural gas transmission pipe 1 is provided with a sealing cover 3, and the sealing cover 3 includes an upper cover shell 4 and a lower cover shell 5, and the upper cover shell 4 is located above the lower cover shell 5;

[0028] The upper cover shell 4 and the lower cover shell 5 are both integrally formed with arc-shaped pipe clamps 6 on both end surfaces, and the arc-shaped pipe clamps 6 cover the surface of the natural gas transmission pipe 1;

[0029] A natural gas concentration monitor 9 is installed on the upper surface of the upper cover shell 4, a vacuum pump 13 is provided on one side of the natural gas concentration monitor 9, a negative pressure gauge 10 is provided on one side of the natural gas concentration monitor 9, the negative pressure gauge 10 is conductively connected to the upper cover shell 4, a three-way pipe 11 is provided on one side of the negative pressure gauge 10, the bottom of the three-way pipe 11 is conductively connected to the upper cover shell 4, a pressure relief valve 12 is threadedly connected to the top of the three-way pipe 11, and the middle part of the three-way pipe 11 is connected to the suction end of the vacuum pump 13 through a pipeline.

[0030] It should be noted that the sealing cover 3 is covered at the connection of the natural gas transmission pipe 1, and the pressure relief valve 12 is closed. The air in the sealing cover 3 can be extracted by the vacuum pump 13 to make the sealing cover 3 in a vacuum state. The negative pressure value in the sealing cover 3 can be monitored by the negative pressure gauge 10. When a leak occurs at the connection of the natural gas transmission pipe 1, the leakage rate of the natural gas can be accelerated under the action of the negative pressure, thereby improving the detection efficiency of the natural gas pipeline. Since the sealing cover 3 is in a vacuum state and there is no air, when the natural gas pipeline connection leaks, the leaked natural gas is stored in the sealing cover 3 without the influence of air, so that the purity of the natural gas in the sealing cover 3 can be higher, and a small amount of natural gas leakage can be quickly detected by the natural gas concentration monitor 9, which not only improves the accuracy of natural gas leakage detection, but also improves the detection efficiency of natural gas leakage. After detection, the pressure relief valve 12 is opened to release the pressure of the sealing cover 3.

[0031] In this embodiment, if Figure 3 As shown, two groups of arc-shaped pipe clamps 6 are spliced ​​into a circular structure, and the inner walls of the arc-shaped pipe clamps 6 are provided with arc-shaped sealing rings 7, and the inner walls of the arc-shaped sealing rings 7 abut against the surface of the natural gas transmission pipe 1.

[0032] It should be noted that the arc-shaped pipe clamp 6 is spliced ​​into a circular structure and the arc-shaped sealing ring 7 is squeezed, and the arc-shaped pipe clamp 6 and the natural gas transmission pipe 1 can be sealed by the arc-shaped sealing ring 7.

[0033] In this embodiment, if Figure 3As shown, a rubber socket 14 is fixedly connected to the lower surface of the upper cover shell 4, and a sealing socket 15 is opened on the upper surface of the cavity wall of the lower cover shell 5 at a position corresponding to the rubber socket 14, and the rubber socket 14 is plugged into the sealing socket 15.

[0034] It should be noted that, by plugging the rubber plug-in seat 14 into the sealing plug-in groove 15 , the connection between the upper cover shell 4 and the lower cover shell 5 can be sealed.

[0035] In this embodiment, if Figure 1 As shown, both side surfaces of the upper cover shell 4 and the lower cover shell 5 are integrally formed with fixing frames 8, and fixing bolts are inserted through the surface of the fixing frames 8.

[0036] It should be noted that the upper cover shell 4 and the lower cover shell 5 can be quickly assembled by matching the fixing frame 8 with the fixing bolts.

[0037] The working principle and use process of the utility model are as follows: the natural gas transmission pipes 1 are sealed and connected by connecting flanges 2 and bolts, the upper cover shell 4 and the lower cover shell 5 form a sealing cover 3 and are sleeved on the connection of the natural gas transmission pipe 1, two groups of arc-shaped pipe clamps 6 are spliced ​​into a circular structure and sleeved on the surface of the natural gas transmission pipe 1, the arc-shaped pipe clamp 6 squeezes the arc-shaped sealing ring 7, and the connection between the arc-shaped pipe clamp 6 and the natural gas transmission pipe 1 can be sealed, the upper cover shell 4 and the lower cover shell 5 are plugged in by a rubber plug-in seat 14 and a sealing plug-in groove 15, and the sealing cover 3 can be sealed, the pressure relief valve 12 is closed, and the air in the sealing cover 3 can be extracted by the vacuum pump 13, so that the sealing cover 3 is in a vacuum state, The negative pressure value in the sealing cover 3 can be monitored by the negative pressure gauge 10. When a leak occurs at the connection of the natural gas transmission pipe 1, the leakage speed of the natural gas can be accelerated under the action of negative pressure, thereby improving the detection efficiency of the natural gas pipeline. Since the sealing cover 3 is in a vacuum state and there is no air, when the connection of the natural gas pipeline leaks, the leaked natural gas is stored in the sealing cover 3 without the influence of air, so that the purity of the natural gas in the sealing cover 3 can be higher. A small amount of natural gas leakage can be quickly detected by the natural gas concentration monitor 9, which not only improves the accuracy of natural gas leakage detection, but also improves the detection efficiency of natural gas leakage. After detection, the pressure relief valve 12 is opened to relieve the pressure of the sealing cover 3.

[0038] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims or the equivalent forms of such scope and boundaries.

Claims

1. A natural gas pipeline inspection and maintenance device, comprising a natural gas transmission pipe (1) and a connecting flange (2), wherein the connecting flange (2) is connected to the end of the natural gas transmission pipe (1), and the natural gas transmission pipes (1) are connected to each other through the connecting flange (2), characterized in that: The movable cover at the connection of the natural gas transmission pipe (1) is provided with a sealing cover (3), the sealing cover (3) comprising an upper cover shell (4) and a lower cover shell (5), the upper cover shell (4) being located above the lower cover shell (5); The surfaces of both ends of the upper cover shell (4) and the lower cover shell (5) are integrally formed with arc-shaped pipe clamps (6), and the arc-shaped pipe clamps (6) cover the surface of the natural gas transmission pipe (1); A natural gas concentration monitor (9) is installed on the upper surface of the upper cover shell (4), and a vacuum pump (13) is provided on one side of the natural gas concentration monitor (9).

2. A natural gas pipeline inspection and maintenance equipment according to claim 1, characterized in that: The two groups of arc-shaped pipe clamps (6) are spliced ​​into a circular structure, and the inner walls of the arc-shaped pipe clamps (6) are each provided with an arc-shaped sealing ring (7), and the inner wall of the arc-shaped sealing ring (7) abuts against the surface of the natural gas transmission pipe (1).

3. A natural gas pipeline inspection and maintenance equipment according to claim 2, characterized in that: A negative pressure gauge (10) is provided on one side of the natural gas concentration monitor (9), and the negative pressure gauge (10) is conductively connected to the upper housing (4).

4. A natural gas pipeline inspection and maintenance equipment according to claim 3, characterized in that: A three-way pipe (11) is provided on one side of the negative pressure gauge (10); the bottom of the three-way pipe (11) is conductively connected to the upper housing (4); and the top of the three-way pipe (11) is threadedly connected to a pressure relief valve (12).

5. A natural gas pipeline inspection and maintenance equipment according to claim 4, characterized in that: The middle part of the three-way pipe (11) is connected to the suction end of the vacuum pump (13) through a pipeline.

6. A natural gas pipeline inspection and maintenance equipment according to claim 1, characterized in that: The lower surface of the upper cover shell (4) is fixedly connected with a rubber plug-in seat (14), and the upper surface of the cavity wall of the lower cover shell (5) is provided with a sealing plug-in groove (15) at a position corresponding to the position of the rubber plug-in seat (14), and the rubber plug-in seat (14) is plugged into the sealing plug-in groove (15).

7. The natural gas pipeline inspection and maintenance equipment according to claim 1, characterized in that: The upper cover shell (4) and the lower cover shell (5) are both integrally formed with fixing frames (8), and fixing bolts are inserted through the surface of the fixing frame (8).

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