Sealing device for natural gas pipeline

Abstract

The invention relates to a sealing device for a natural gas pipeline, and belongs to the technical field of natural gas pipelines, the sealing device comprises a pipe body, multiple mounting rings and an air bag, the pipe body is used for natural gas to pass through, the multiple mounting rings are arranged at intervals, and air pumps are arranged on the mounting rings; the air bag is installed on the installation ring, the air bag is communicated with the air pump, and the air bag abuts against the inner side wall of the tube body to be used for blocking the channel of the tube body when expanding. The effect of improving the maintenance convenience of the natural gas pipeline is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas pipelines, in particular to a sealing device for a natural gas pipeline. BACKGROUND

[0002] A natural gas pipeline refers to a pipeline for transporting natural gas (including associated gas produced in oil fields) from a mining site or a processing plant to a city gas distribution center or an industrial enterprise user, also known as a gas pipeline. Natural gas is transported by natural gas pipelines, which is a way of transporting large amounts of natural gas on land. In the total length of the world pipeline, natural gas pipelines account for about half. Natural gas pipeline transportation has the advantages of low transportation cost, small land occupation, fast construction, large oil and gas transportation capacity, high safety performance, low transportation loss, no "three wastes" emission, small risk of leakage, small environmental pollution, small influence of adverse weather, small equipment maintenance amount, easy management, and easy realization of remote centralized monitoring. In the related art, the natural gas pipeline is formed by connecting multiple pipes, and the connection between the multiple pipes is sealed by welding.

[0003] For the related art in the above, since the natural gas pipeline is sealed by welding multiple pipes, when a pipe has a problem, the natural gas main valve needs to be closed, and the natural gas in the entire natural gas pipeline needs to be vented before maintenance, which leads to the defect that the natural gas pipeline is inconvenient to maintain. SUMMARY

[0004] In order to improve the convenience of natural gas pipeline maintenance, the present application provides a sealing device for a natural gas pipeline.

[0005] The sealing device for a natural gas pipeline provided by the present application adopts the following technical solution: A sealing device for a natural gas pipeline, comprising a pipe body, a mounting ring, and an air bag, the pipe body is for natural gas to pass through, the mounting ring is provided in plurality, the mounting rings are arranged at intervals, and the mounting ring is provided with an air pump; the air bag is installed on the mounting ring, the air bag is in communication with the air pump, and the air bag abuts against the inner side wall of the pipe body when inflated to block the passage of the pipe body.

[0006] By adopting the above technical solution, when a natural gas leak occurs in the pipeline, the air pumps on the two closest mounting rings on both sides of the leak will start to inflate the two air bladders. This inflates the two air bladders, sealing both sides of the leak. The pressure of the air inside the air bladders on the pipeline achieves a seal, forming a chamber on both sides of the leak. The natural gas in this chamber is then extracted, allowing for repairs to be made. This design eliminates the need to vent the entire pipeline when a leak occurs. Simply inflating the air bladders on both sides of the leak to seal it and extracting the natural gas allows for pipeline repairs, thus improving the convenience of natural gas pipeline maintenance and reducing maintenance costs.

[0007] Optionally, the airbag is arranged in a ring shape, and two airbags are arranged on the same mounting ring. The two airbags are respectively connected to the two sides of the mounting ring. Two sets of air pumps are arranged on the mounting ring. The air pump input ends of the two sets of air pumps are respectively located on the two sides of the mounting ring, and the air pump output ends of the two sets of air pumps are respectively connected to the two airbags. The air pump input end and air pump output end of one set of air pumps are respectively located on the two sides of the mounting ring.

[0008] By adopting the above technical solution, since there are two gas pumps and two gas bags respectively, when a natural gas pipeline leaks, the two gas pumps connected to the two gas bags that are far apart from each other will be activated, causing the two gas bags to expand in the opposite direction. At the same time, because the gas bags are arranged in a ring shape, the gas bags will expand towards the inner wall of the pipe and towards the axis of the pipe respectively when they expand, so as to seal the inner wall of the pipe. Since the gas pump input end is inside the pipe, the gas used to expand the gas bags is natural gas. This allows the natural gas in the chamber formed by the inner wall of the pipe and the two expanded gas bags to be transferred into the gas bags. When the leak is repaired, the natural gas in the gas bags will be released again under the action of the gas pump, thereby reducing the waste of natural gas.

[0009] Optionally, an annular groove is provided on the inner wall of the tube body, and after the airbag is inflated, the outer wall of the airbag will fit against the side wall and bottom of the annular groove.

[0010] By adopting the above technical solution, due to the setting of the annular groove, when the airbag inflates, the outer wall of the airbag will be subjected to the action of the internal gas, so that the outer wall of the airbag will fit with the side wall and bottom of the annular groove, thereby increasing the contact area between the outer wall of the airbag and the inner wall of the tube, which helps to improve the sealing performance when the airbag and the inner wall of the tube come into contact.

[0011] Optionally, an adsorption patch is provided at the bottom of the annular groove, and the adsorption patch has a predetermined adsorption force on the outer wall of the airbag.

[0012] By adopting the above technical solution, after the gasbag inflates, it extends into the annular groove and abuts against the bottom of the groove. Under the action of the adsorption, the bottom of the annular groove and the gasbag will form a connection of predetermined strength. This can minimize the possibility of gaps between the inner wall of the pipe and the outer wall of the gasbag caused by vibration of the pipe body during maintenance of the leak. At the same time, when the gasbag discharges gas, it will still be connected to the inner wall of the pipe body to minimize the possibility of the gasbag falling naturally under the action of gravity and affecting the internal passage of the pipe body, thus reducing the efficiency of natural gas transportation.

[0013] Optionally, the mounting ring is slidably connected in the tube body, and the sliding direction of the mounting ring is along the axis of the tube body.

[0014] By adopting the above technical solution, since the mounting ring is slidably connected to the pipe body, the mounting ring can be slid according to the location of the leak in the pipe body to adjust the distance between the mounting rings on both sides of the leak. Therefore, when the gas pump draws natural gas between the two mounting rings, it can minimize the leakage of more natural gas.

[0015] Optionally, a magnetic ring is fitted on the outer wall of the tube body. The magnetic ring is used to attract the mounting ring. The magnetic ring is slidably connected to the peripheral outer wall of the tube body so that the mounting ring slides synchronously.

[0016] By adopting the above technical solution, due to the setting of the magnetic ring, when it is necessary to adjust the distance between the mounting rings on both sides of the leak, it is only necessary to slide the position of the magnetic ring on the outer wall of the pipe. The magnetic ring's attraction force on the mounting ring drives the mounting ring to slide, thus achieving the desired distance between the mounting rings on both sides of the leak. At the same time, under the attraction of the magnetic ring, the mounting ring can always be in contact with the inner wall of the pipe to further increase the sealing performance.

[0017] Optionally, an elastic pad is provided on the outer wall of the mounting ring, the elastic pad being used to abut against the inner wall of the tube body.

[0018] By adopting the above technical solution, the elastic pad can protect the mounting ring when it slides on the inner wall of the tube, reducing wear on the mounting ring. At the same time, because the elastic pad is made of elastic material, it will deform under force to better adhere to the inner wall of the tube, so that there is a predetermined compressive force between the mounting ring and the inner wall of the tube, thereby minimizing the possibility of misalignment when the magnetic ring drives the mounting ring to slide on the inner wall of the tube.

[0019] Optionally, a wind speed detection device is provided inside the pipe body, and the wind speed detection device is electrically connected to the air pump.

[0020] By adopting the above technical solution, due to the setting of the wind speed detection device, when a leak occurs in the natural gas pipeline, the natural gas wind speed at this point in the pipeline will deviate significantly. The wind speed detection device will then send an electrical signal to the corresponding air pump, causing the corresponding air pump to start working. This will seal the two sides of the leak, thereby reducing the amount of natural gas flowing out from the leak and helping to reduce the waste of natural gas.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. Due to the installation of mounting rings, air pumps, and air bladders, when a natural gas leak occurs in the pipeline, the air pumps on the two closest mounting rings on both sides of the leak will start to inflate the two air bladders. This inflates the two air bladders, sealing both sides of the leak. The pressure of the air inside the air bladders on the pipeline achieves a seal, forming a chamber on both sides of the leak. The natural gas in this chamber is then extracted, allowing for repairs to be made. This design eliminates the need to vent the entire natural gas pipeline when a leak occurs. Simply inflating the air bladders on both sides of the leak to seal it and extracting the natural gas allows for pipeline repairs, thus improving the convenience of natural gas pipeline maintenance and reducing maintenance costs. 2. Because the gas pump and the gas bag are set up in two separate ways, when a natural gas pipeline leaks, the two gas pumps connected to the two gas bags that are far apart will start, causing the two gas bags to expand in the opposite directions. At the same time, because the gas bags are set up in a ring shape, the gas bags will expand towards the inner wall of the pipe and towards the axis of the pipe when they expand, thus sealing the inner wall of the pipe. Since the gas pump input end is inside the pipe, the gas that expands the gas bags is natural gas. This allows the natural gas in the chamber formed by the inner wall of the pipe and the two expanded gas bags to be transferred into the gas bags. When the leak is repaired, the natural gas in the gas bags will be released again under the action of the gas pump, thereby reducing the waste of natural gas. 3. Due to the adsorption patch, after the gasbag inflates, it extends into the annular groove and abuts against the bottom of the groove. Under the action of the adsorption patch, the bottom of the annular groove and the gasbag will form a connection of predetermined strength. This can minimize the risk of gaps between the inner wall of the pipe and the outer wall of the gasbag caused by vibrations in the pipe body during repairs of leaks. At the same time, when the gasbag discharges gas, it will still be connected to the inner wall of the pipe body to minimize the risk of the gasbag falling naturally under gravity and affecting the pipe passage and thus reducing the efficiency of natural gas transportation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sealing device for natural gas pipelines in this embodiment.

[0023] Figure 2 This is a cross-sectional view made in this embodiment to show the internal structure of the tube.

[0024] Figure 3 This is a schematic diagram made in this embodiment to illustrate the structure on the mounting ring.

[0025] Explanation of reference numerals in the attached drawings: 1. Tube body; 11. Annular groove; 12. Adhesive sticker; 121. Main sticker; 122. Secondary sticker; 2. Mounting ring; 21. Air pump input end; 22. Air pump output end; 23. Elastic pad; 3. Airbag; 4. Magnetic ring; 5. Wind speed detection component. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0027] This application discloses a sealing device for natural gas pipelines.

[0028] Reference Figure 1 and Figure 2 The sealing device for natural gas pipelines includes a pipe body 1, mounting rings 2, and an air bladder 3. Specifically, the pipe body 1 is cylindrical, and its cross-section, viewed from one side of the pipe opening, is annular. The pipe body 1 has a thin-walled structure. Multiple pipe bodies 1 are connected in various combinations to form a natural gas pipeline. Sealing is achieved at the joints of the multiple pipe bodies 1 through welding; other sealing structures can also be used in other embodiments. The mounting ring 2 is annular and coaxially connected to the inner wall of the pipe body 1. Multiple mounting rings 2 are provided, and they extend along the pipe body... The pipeline is axially distributed with multiple mounting rings 2 spaced apart along the distribution of the natural gas pipeline. The mounting rings 2 provide a base for the installation of other structures. An air pump (not shown in the figure) is installed on the mounting rings 2. The air bladder 3 is ring-shaped and connected to the air pump. The air bladder 3 is made of elastic material. When the air bladder 3 expands under the action of the air pump, the side of the air bladder 3 close to the inner wall of the pipeline 1 will expand and deform towards the inner wall of the pipeline 1, while the side of the air bladder 3 away from the inner wall of the pipeline 1 will expand towards the axis of the pipeline 1 until the pipeline inside the pipeline 1 is completely blocked.

[0029] Reference Figure 1 and Figure 2When a natural gas leak occurs in the pipeline, the air pumps on the two mounting rings 2 on both sides of the leak will start and inflate the airbags 3. This inflates the two airbags 3 to seal the leak on both sides of the pipeline, forming a chamber around the leak. The natural gas in this chamber is then evacuated to prevent a natural gas leak and explosion during repairs of the leak in the pipeline body 1. This design allows for safe repairs of the natural gas pipeline leak. In the event of a natural gas leak, only the natural gas around the leak needs to be evacuated to repair the leak, rather than evacuating the entire natural gas pipeline. This improves the convenience of natural gas pipeline repairs and reduces the cost of natural gas repairs.

[0030] Reference Figure 2 and Figure 3 Two airbags 3 are provided on the same mounting ring 2, and the two airbags 3 are respectively connected to opposite sides of the mounting ring 2. The two airbags 3 inflate in a direction away from each other. At the same time, two sets of air pumps are provided. The air pump input ends 21 of the two sets of air pumps are respectively located on both sides of the mounting ring 2, and the air pump output ends 22 of the two sets of air pumps are also respectively located on both sides of the mounting ring 2. The air pump output ends 22 of the two sets of air pumps are respectively connected to the two airbags 3. Moreover, the air pump input ends 21 and air pump output ends 22 of the same set of air pumps are respectively located on both sides of the mounting ring 2. In this embodiment, four air pumps are provided in one set. The air pump input ends 21 and air pump output ends 22 of the four air pumps are respectively arranged in a circular array with the axis of the mounting ring 2 as the center. The air pump input ends 21 and air pump output ends 22 of the two sets of air pumps are adjacent on the same side of the mounting ring 2. The included angles between the two gas pumps are equal, and the gas pump output ends 22 are all located on the side closer to the axis of the mounting ring 2, while the gas pump input ends 21 are all located on the side farther from the axis of the mounting ring 2. Therefore, when a natural gas pipeline leaks, the two sets of gas pumps with their output ports on the mounting ring 2 on both sides of the leak will start to inflate the two gas bags 3 that are far apart from each other. At the same time, multiple gas pumps in working condition will draw natural gas from the pipe body 1 and the area around the leak into the chamber of the gas bag 3. This can reduce the extraction of natural gas. While sealing the leak on both sides of the natural gas pipe body 1, the natural gas in the chamber can be extracted. After the natural gas pipeline leak is repaired, the gas pump will release the natural gas in the gas bag 3 back into the pipeline, thereby reducing the waste of natural gas during the repair process.

[0031] Reference Figure 2 and Figure 3An annular groove 11 is provided on the inner wall of the tube body 1. The two sides of the groove opening of the annular groove 11 are parallel, and the axis of the annular groove 11 is coaxial with the axis of the tube body 1. Multiple annular grooves 11 are provided and are distributed at intervals along the axis of the tube body 1. When the airbag 3 expands under the action of the air pump, the side of the airbag 3 near the inner wall of the tube body 1 will block the groove opening of the annular groove 11. Under the action of internal air pressure, the airbag 3 will extend into the annular groove 11 and form a predetermined compression with the two sides and the bottom of the annular groove 11. The pressure method is compatible. In addition, in this embodiment, the two side walls and the bottom of the annular groove 11 are made of elastic material. Therefore, when the airbag 3 squeezes the side wall and the bottom of the annular groove 11, the airbag 3 will fully fit with the elastic material in the annular groove 11. By increasing the contact area between the airbag 3 and the inner side wall of the pipe body 1, the sealing performance of the sealing device is further improved. This can minimize the possibility of natural gas leaking out from the gap between the airbag 3 and the inner side wall of the pipe body 1 during the maintenance of the natural gas pipeline, causing natural gas leakage and explosion.

[0032] Reference Figure 2 and Figure 3 An adsorption patch 12 is provided at the bottom of the annular groove 11. The adsorption patch 12 includes a main patch 121 and a secondary patch 122. The main patch 121 is located at the bottom of the annular groove 11 and is distributed along the extension direction of the bottom of the annular groove 11 so that the main patch 121 is in a ring shape. The secondary patch 122 is located on the outer wall of the airbag 3. The shape of the secondary patch 122 corresponds to that of the main patch 121. The secondary patch 122 is used to attach to the main patch 121. Therefore, when the airbag 3 is inflated, the secondary patch 122 on the airbag 3 will adhere to the main patch 121, so that the airbag 3 can increase the positional stability of the natural gas pipeline during maintenance. At the same time, after the airbag 3 is discharged under the action of the air pump, the outer wall of the airbag 3 still has a predetermined strength of connection with the inner wall of the pipe body 1. This can minimize the obstruction of the passage in the pipe body 1 by the airbag 3 naturally falling when it is not inflated.

[0033] Reference Figure 2 and Figure 3A magnetic ring 4 is fitted on the outer wall of the pipe body 1. The magnetic ring 4 is circular and slides coaxially on the outer wall of the pipe body 1. The inner wall of the magnetic ring 4 rubs against the outer wall of the pipe body 1. The magnetic ring 4 is used to attract the mounting ring 2. When the magnetic ring 4 slides on the pipe body 1, it will drive the mounting ring 2 to slide together. The magnetic ring 4 will make the outer wall of the mounting ring 2 always have a squeezing force on the inner wall of the pipe body 1. At the same time, an elastic pad 23 is provided on the outer wall of the mounting ring 2. The elastic pad 23 will deform under force to better fit the inner wall of the pipe body 1. So that the mounting ring 2 and the inner wall of the pipe body 1 have a predetermined squeezing force, the phenomenon of misalignment when the magnetic ring drives the mounting ring 2 to slide on the inner wall of the pipe body 1 can be avoided as much as possible. Therefore, according to the location of the leak on the pipe body 1, the position of the mounting ring 2 on both sides of the leak can be adjusted. When the gas pump draws natural gas between the two mounting rings 2, the leakage of more natural gas can be minimized.

[0034] Reference Figure 2 and Figure 3 In addition, in this embodiment, a wind speed detection device 5 is also provided on the inner wall of the pipe body 1. The wind speed detection device 5 is connected to multiple air pumps. When a natural gas pipeline leaks, the wind speed detection device 5 located on the pipe body 1 at the leak point will detect a large deviation in the flow rate of natural gas in the channel of the pipe body 1. Then, it will send an electrical signal to the corresponding air pump to start the corresponding air pump. This can quickly seal the two sides of the leak point, thereby reducing the amount of natural gas flowing out from the leak point and helping to reduce the waste of natural gas.

[0035] The implementation principle of a sealing device for a natural gas pipeline according to an embodiment of this application is as follows: when a natural gas leak occurs on the pipe body 1, the air pumps on the two mounting rings 2 located on both sides of the leak point on the pipe body 1 will be activated so that the airbags 3 can seal the leak on both sides. Then, the natural gas in the chamber is extracted, and then the leak point can be repaired, thereby helping to improve the convenience of natural gas pipeline maintenance and reducing the cost of natural gas maintenance.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing device for natural gas pipelines, characterized in that: The device includes a pipe body (1), mounting rings (2), and an air bladder (3). The pipe body (1) is for natural gas to pass through. Multiple mounting rings (2) are provided and spaced apart. An air pump is provided on each mounting ring (2). The air bladder (3) is installed on the mounting rings (2) and is connected to the air pump. When the air bladder (3) expands, it abuts against the inner wall of the pipe body (1) to block the passage of the pipe body (1).

2. A sealing device for a natural gas pipeline according to claim 1, characterized in that: The airbag (3) is arranged in a ring shape. There are two airbags (3) on the same mounting ring (2). The two airbags (3) are respectively connected to the two sides of the mounting ring (2). There are two sets of air pumps on the mounting ring (2). The air pump input ends (21) of the two sets of air pumps are respectively located on the two sides of the mounting ring (2). The air pump output ends (22) of the two sets of air pumps are respectively connected to the two airbags (3). The air pump input end (21) and air pump output end (22) of one set of air pumps are respectively located on the two sides of the mounting ring (2).

3. A sealing device for a natural gas pipeline according to claim 1, characterized in that: The inner wall of the tube (1) is provided with an annular groove (11). After the airbag (3) is inflated, the outer wall of the airbag (3) will fit against the side wall and bottom of the annular groove (11).

4. A sealing device for a natural gas pipeline according to claim 3, characterized in that: The bottom of the annular groove (11) is provided with an adsorption patch (12), which has a predetermined adsorption force on the outer wall of the airbag (3).

5. A sealing device for a natural gas pipeline according to claim 1, characterized in that: The mounting ring (2) is slidably connected in the tube body (1), and the sliding direction of the mounting ring (2) is along the axis of the tube body (1).

6. A sealing device for a natural gas pipeline according to claim 5, characterized in that: A magnetic ring (4) is fitted on the outer wall of the tube body (1). The magnetic ring (4) is used to attract the mounting ring (2). The magnetic ring (4) is slidably connected to the outer wall of the tube body (1) so that the mounting ring (2) slides synchronously.

7. A sealing device for a natural gas pipeline according to claim 6, characterized in that: An elastic pad (23) is placed on the outer side wall of the mounting ring (2), and the elastic pad (23) is used to abut against the inner side wall of the tube body (1).

8. A sealing device for a natural gas pipeline according to claim 1, characterized in that: The pipe body (1) is equipped with a wind speed detection device (5) inside, and the wind speed detection device (5) is electrically connected to the air pump.

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