Pipeline pressure monitoring device and method for gas pipe network

Abstract

The invention relates to the technical field of gas pipeline monitoring, in particular to a pipeline pressure monitoring device and method for a gas pipe network, which is used for monitoring the pressure in a pipeline, and comprises flange pipes fixedly connected to the two ends of the pipeline, hollow bodies are fixedly mounted on the flange pipes, winding parts are rotatably connected in the hollow bodies, and monitoring cavities are formed in the winding parts; a first pressure sensor inserted into the monitoring cavity is installed outside the hollow body, a ventilation pipe communicated with the monitoring cavity is fixedly installed on the winding piece, the ventilation pipe is wound on the winding piece, the ventilation pipe penetrates through the flange pipe and is in sliding connection with the flange pipe, and a flexible air bag is fixedly installed at the end of the ventilation pipe; the monitoring cavity, the interior of the ventilation pipe and the interior of the flexible air bag jointly form an external pressure cavity. According to the monitoring device, the flexible air bag moves in the pipeline, the pressure value of each axial position of the pipeline is monitored in real time, and therefore the leakage point position of the pipeline is roughly judged.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline monitoring, and in particular to a pipeline pressure monitoring device and method for a gas pipeline network. Background Art

[0002] The gas pipeline network refers to the system consisting of all facilities from the gate station to the user, including the gate station or gas source plant compressor station, gas storage facilities, pressure regulating devices, transmission and distribution pipelines, metering devices, management facilities, monitoring systems, etc. The long-distance gas pipeline connects the gas field with huge output or artificial gas and the gas pipeline in the gas-using area. The ends of its trunk and branch pipes are connected to towns or large industrial enterprises as the gas source points of the gas supply area. Some pipelines are erected in the air, and some are buried underground. Compared with other pipelines, gas pipelines have particularly strict requirements because pipeline leaks may cause accidents such as fires, explosions, and poisoning. The higher the pressure in the gas pipeline, the greater the possibility of the pipeline joints being detached and cracks in the pipeline itself. Therefore, pipeline pressure detection and leakage detection for gas pipeline networks are of utmost importance.

[0003] When testing the pipeline pressure of gas network pipes on the market, the method of monitoring is generally to set up pressure sensors at fixed points. Due to the price of pressure sensors, one is usually set at an interval of 100m. This will make it impossible to monitor the pressure of the pipeline between the two pressure sensors. In particular, if there is a leak in the pipeline between the two pressure sensors, the staff needs to hold a portable gas monitor to manually detect it along the pipeline, which is very troublesome, especially for pipelines buried deep underground. The detection is more cumbersome and the detection efficiency is low.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] The purpose of the present invention is to design a device that can detect the pressure at each axial position in the pipeline of the gas network pipe, and can roughly detect the pipeline leakage point, thereby improving the efficiency of leak point search, so as to solve the above-mentioned deficiencies in the technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pipeline pressure monitoring device for a gas pipeline network, used for monitoring the pressure in the pipeline, comprising a flange pipe fixedly connected at both ends of the pipeline, a hollow body fixedly installed on the flange pipe, a winding piece rotatably connected in the hollow body, a monitoring cavity inside the winding piece, a first pressure sensor inserted into the monitoring cavity is installed outside the hollow body, a vent pipe connected to the monitoring cavity is fixedly installed on the winding piece, the vent pipe is wound on the winding piece, the vent pipe passes through the flange pipe and is slidably connected to the flange pipe, a flexible air bag is fixedly installed at the end of the vent pipe, and the monitoring cavity, the inside of the vent pipe and the inside of the flexible air bag together form an external pressure chamber; By releasing the vent pipe on the winding member, the gas moving in the pipeline drives the flexible airbag to move in the pipeline. At the same time, the gas in the pipeline applies pressure to cause the flexible airbag to deform until the air pressure in the external pressure chamber is the same as the air pressure in the pipeline. The first pressure sensor can monitor the air pressure at the position of the flexible airbag in the pipeline by monitoring the air pressure in the external pressure chamber.

[0007] Preferably, the winding member includes a winding column rotatably connected to the hollow body, a hollow column through which the end of the winding column passes and is rotatably connected, and a hollow cavity opened inside the winding column. The hollow cavity and the interior of the hollow column together form the monitoring cavity, and the first pressure sensor is inserted into the hollow column.

[0008] Preferably, two baffles are fixedly connected to the outside of the winding column, and the two baffles are respectively located on both sides of the ventilation pipe.

[0009] Preferably, the pressure in the external pressure chamber is lower than the pressure in the pipeline under normal circumstances.

[0010] Preferably, a mounting plate is fixedly connected to the surface of the hollow body, a motor, a power supply, a control panel and a positioning strip are fixedly connected to the mounting plate, the positioning strip is fixedly connected to the outer wall of the hollow column, a first gear is fixedly connected to the end of the motor output shaft, a second gear is meshed with one side of the first gear, the second gear is fixedly connected to the winding column, the first pressure sensor, the control panel and the motor are all electrically connected to the power supply, and the first pressure sensor and the motor are all electrically connected to the control panel.

[0011] Preferably, a second pressure sensor is also installed in the flange pipe, the power supply is electrically connected to the second pressure sensor, and the second pressure sensor is electrically connected to the control panel.

[0012] In a second aspect, the present invention further provides a method for operating the pipeline pressure monitoring device for a gas network pipe, the method comprising the steps of: S1: The second pressure sensors at both ends of the pipeline monitor the internal pressures at both ends of the pipeline respectively until the internal pressure values ​​at both ends of the pipeline differ from the expected range for a long time; S2: The motor output shaft rotates, gradually releasing the vent pipe wound on the winding column, and the gas moving in the pipeline drives the flexible airbag to move in the pipeline, and the flexible airbag will deform until the air pressure in the external pressure chamber is the same as the air pressure in the pipeline. The first pressure sensor can monitor the air pressure at the position of the flexible airbag in the pipeline by monitoring the air pressure in the external pressure chamber; S3: The first pressure sensor monitors that the pressure value in the flexible airbag gradually decreases. When the pressure value in the flexible airbag drops to a certain range and the pressure value no longer decreases, the motor stops rotating. The control panel estimates the distance the flexible airbag moves in the pipeline based on the number of rotations of the motor and transmits the data to the staff.

[0013] In the above technical solution, the technical effects and advantages provided by the present invention are: 1. This monitoring device uses a flexible airbag to move in the pipeline, monitor the pressure values ​​of each axial position of the pipeline in real time, and roughly determine the point of pipeline leakage, which is convenient for the staff to hold a portable gas monitor to conduct specific detection at the approximate point, so as to quickly find the leakage location, instead of the staff holding a portable gas monitor to detect little by little along the pipeline direction as in the prior art, which improves the detection efficiency; 2. This monitoring device uses the deformable and light-weight characteristics of the flexible airbag, so that the flexible airbag can be pushed by the gas in the pipeline, and the flexible airbag shrinks in its initial state, and can expand and enlarge when the pressure in the pipeline decreases, ensuring that the pressure value in the flexible airbag is the same as the pressure value at each point in the pipeline, thereby monitoring the pressure at different positions in the pipeline in real time; 3. This detection device uses the second pressure sensor to monitor the pressure values ​​at both ends of the pipeline under normal conditions, and uses the first pressure sensor only when a leak occurs. The second pressure sensor can also be omitted directly, and the first pressure sensor is started for monitoring under normal conditions. After the leak point is roughly detected, the motor can be rotated in the opposite direction to retract the flexible airbag for next use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 is a cross-sectional view of a winding member of the present invention; Figure 4It is a schematic diagram of the connection between the ventilation pipe and the winding column of the present invention.

[0016] Description of reference numerals: 1. Pipe; 2. Flange pipe; 3. Hollow body; 4. Winding member; 4a. Winding column; 4b. Hollow column; 4c. Hollow cavity; 5. Monitoring cavity; 6. First pressure sensor; 7. Ventilation pipe; 8. Flexible airbag; 9. Baffle; 10. Mounting plate; 11. Motor; 12. Power supply; 13. Control panel; 14. Positioning strip; 15. First gear; 16. Second gear; 17. Second pressure sensor. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The present invention provides Figure 1-4The pipeline pressure monitoring device for a gas pipeline network shown in the figure comprises a flange pipe 2 fixedly connected at both ends of a pipeline 1, a hollow body 3 fixedly installed on the flange pipe 2, a winding column 4a rotatably connected in the hollow body 3, a hollow column 4b passing through and rotatably connected at the end of the winding column 4a, a hollow cavity 4c is provided in the winding column 4a, the hollow cavity 4c and the hollow column 4b together form a monitoring cavity 5, the winding member 4, the hollow column 4b and the hollow cavity 4c together form the winding member 4, a first pressure sensor 6 inserted into the hollow column 4b is installed at the end of the hollow column 4b, the first pressure sensor 6 is in contact with the monitoring cavity 5, and the winding column 4a is fixed. A ventilation pipe 7 connected to the monitoring cavity 5 is installed, and a hard curved pipe can also be fixedly installed on the winding column 4a first, and then the hard curved pipe is connected to the ventilation pipe 7 to prevent the ventilation pipe 7 from being directly connected to the monitoring cavity 5, resulting in excessive bending during winding, resulting in the ventilation pipe 7 being unable to communicate with the monitoring cavity 5. The ventilation pipe 7 is wound on the winding member 4, and the ventilation pipe 7 passes through the flange pipe 2 and is slidably connected to the flange pipe 2. A flexible air bag 8 is fixedly installed at the end of the ventilation pipe 7, which can be spherical, disc-shaped, etc. The monitoring cavity 5, the interior of the ventilation pipe 7 and the interior of the flexible air bag 8 together form an external pressure chamber, and it is necessary to ensure that the pressure in the external pressure chamber is lower than the normal pressure. Under the condition of the pressure in the pipeline 1, the pressure in the pipeline 1 is prevented from being less than the pressure in the external pressure chamber, causing the flexible airbag 8 to be in the maximum deformation state, and the situation that the pressure in the pipeline 1 cannot be monitored still occurs. The flexible airbag 8 needs to isolate the pipeline 1 and the external pressure chamber, and can be made of TPU material. The surface of the hollow body 3 is also fixedly connected with a mounting plate 10, and the mounting plate 10 is fixedly connected with a motor 11, a power supply 12, a control panel 13 and a positioning bar 14. The positioning bar 14 is fixedly connected to the outer wall of the hollow column 4b, and the end of the output shaft of the motor 11 is fixedly connected with a first gear 15, and a second gear is meshed on one side of the first gear 15. 16, the second gear 16 is fixedly connected to the winding column 4a, the first pressure sensor 6, the control panel 13 and the motor 11 are all electrically connected to the power supply 12, the first pressure sensor 6 and the motor 11 are all electrically connected to the control panel 13, a second pressure sensor 17 is also installed in the flange pipe 2, the power supply 12 is electrically connected to the second pressure sensor 17, the second pressure sensor 17 is electrically connected to the control panel 13, the second pressure sensor 17 is used to monitor the pressure values ​​at both ends of the pipeline 1 at all times, and the first pressure sensor 6 is activated when the internal pressure values ​​at both ends of the pipeline 1 show a difference outside the expected range for a long time; In a second aspect, the present invention further provides a method for operating the above-mentioned pipeline 1 pressure monitoring device for a gas network pipe, the method comprising the steps of: S1: Under normal conditions, the power source 12 always supplies power to the second pressure sensors 17 at both ends of the pipeline 1. The two second pressure sensors 17 monitor the internal pressure at both ends of the pipeline 1 at all times and transmit the data to the control panel 13. When the pressure values ​​monitored by the two second pressure sensors 17 differ from the expected range for a long time, it indicates that a leak has occurred in this section of the pipeline 1. S2: Then the control panel 13 controls the motor 11 to start, the output shaft of the motor 11 drives the first gear 15 to rotate, the first gear 15 drives the second gear 16 to rotate, and the second gear 16 drives the winding column 4a to rotate, so that the ventilation tube 7 originally wound on the winding column 4a is gradually released, and the gas in the pipeline 1 will blow the flexible airbag 8 when it flows, and the flexible airbag 8 will pull the ventilation tube 7. At this time, the moving gas in the pipeline 1 drives the flexible airbag 8 to move axially in the pipeline 1. Since the flexible airbag 8 is made of TPU material, it can also be other flexible materials, provided that the pipeline 1 and the external pressure chamber are isolated. Because the pressure in the external pressure chamber is lower than the pressure in the pipeline 1 under normal circumstances, the flexible airbag 8 will deform and shrink under normal circumstances to ensure the external The pressure value in the pressure chamber is the same as the pressure value in the pipeline 1. The first pressure sensor 6 can monitor the air pressure at the position of the flexible airbag 8 in the pipeline 1 by monitoring the air pressure in the external pressure chamber. When a leak occurs, it will be found that the leakage of pipeline 1 will cause the pressure in pipeline 1 to change. Specifically, the flow in front of the leak point will increase, while the flow behind the leak point will decrease. The inlet and outlet pressures of all stations on the entire line will decrease, and the closer the station is to the leak point, the greater the drop in inlet and outlet pressure. The specific mechanism of the impact of pipeline 1 leakage on pressure is as follows: the inlet and outlet pressures of all stations in front of the leak point will decrease, and the farther the station is from the leak point, the smaller the change; the inlet and outlet pressures of all stations behind the leak point will also decrease, and the closer the leak point is to the first station, the greater the change in the next station; S3: Because the flexible airbag 8 moves in the pipeline 1, and the pressure in the pipeline 1 decreases due to leakage, the flexible airbag 8 will expand to increase the volume of the external pressure chamber, thereby reducing the pressure in the external pressure chamber, so as to achieve the same pressure as the corresponding position of the flexible airbag 8. The first pressure sensor 6 monitors the pressure value in the flexible airbag 8 and gradually decreases. When the pressure value in the flexible airbag 8 drops to a certain range and the pressure value no longer decreases, it means that the flexible airbag 8 is located around the leakage point. At this time, the motor 11 stops rotating, and the control panel 13 estimates the distance moved by the flexible airbag 8 in the pipeline 1 according to the number of rotations of the output shaft of the motor 11, and then transmits the distance data to the staff. The staff will know the approximate position of the leakage point from the end of the pipeline 1, and the staff can hold a portable gas monitor to monitor the gap at a specific point.

[0020] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are exemplary only. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application.

Claims

1. A pipeline pressure monitoring device for a gas pipeline network, used for monitoring the pressure in a pipeline (1), comprising flange pipes (2) fixedly connected at both ends of the pipeline (1), characterized in that: The flange tube (2) is fixedly mounted with a hollow body (3), a winding member (4) is rotatably connected inside the hollow body (3), a monitoring cavity (5) is provided inside the winding member (4), a first pressure sensor (6) inserted into the monitoring cavity (5) is mounted outside the hollow body (3), a vent pipe (7) connected to the monitoring cavity (5) is fixedly mounted on the winding member (4), the vent pipe (7) is wound on the winding member (4), the vent pipe (7) passes through the flange tube (2) and is slidably connected to the flange tube (2), a flexible air bag (8) is fixedly mounted at the end of the vent pipe (7), and the monitoring cavity (5), the interior of the vent pipe (7) and the interior of the flexible air bag (8) together form an external pressure chamber; By releasing the vent pipe (7) on the winding member (4), the gas moving in the pipeline (1) drives the flexible airbag (8) to move in the pipeline (1). At the same time, the gas in the pipeline (1) applies pressure to cause the flexible airbag (8) to deform until the air pressure in the external pressure chamber is the same as the air pressure in the pipeline (1). The first pressure sensor (6) can monitor the air pressure at the location of the flexible airbag (8) in the pipeline (1) by monitoring the air pressure in the external pressure chamber.

2. A pipeline pressure monitoring device for a gas pipeline network according to claim 1, characterized in that: The winding member (4) comprises a winding column (4a) rotatably connected to the hollow body (3), a hollow column (4b) penetrating the end of the winding column (4a) and rotatably connected thereto, and a hollow cavity (4c) opened inside the winding column (4a); the hollow cavity (4c) and the inside of the hollow column (4b) together form the monitoring cavity (5); and the first pressure sensor (6) is inserted into the hollow column (4b).

3. A pipeline pressure monitoring device for a gas pipeline network according to claim 2, characterized in that: Two baffles (9) are also fixedly connected to the outside of the winding column (4a), and the two baffles (9) are respectively located on both sides of the ventilation pipe (7).

4. A pipeline pressure monitoring device for a gas pipeline network according to claim 1, characterized in that: The pressure in the external pressure chamber is lower than the pressure in the pipeline (1) under normal circumstances.

5. A pipeline pressure monitoring device for a gas pipeline network according to claim 2, characterized in that: A mounting plate (10) is fixedly connected to the surface of the hollow body (3); a motor (11), a power supply (12), a control panel (13) and a positioning bar (14) are fixedly connected to the mounting plate (10); the positioning bar (14) is fixedly connected to the outer wall of the hollow column (4b); a first gear (15) is fixedly connected to the end of the output shaft of the motor (11); a second gear (16) is meshed with one side of the first gear (15); the second gear (16) is fixedly connected to the winding column (4a); the first pressure sensor (6), the control panel (13) and the motor (11) are all electrically connected to the power supply (12); and the first pressure sensor (6) and the motor (11) are all electrically connected to the control panel (13).

6. A pipeline pressure monitoring device for a gas pipeline network according to claim 5, characterized in that: A second pressure sensor (17) is also installed in the flange pipe (2), the power supply (12) is electrically connected to the second pressure sensor (17), and the second pressure sensor (17) is electrically connected to the control panel (13).

7. A method of use for operating a pipeline pressure monitoring device for a gas network pipe according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: The second pressure sensors (17) at both ends of the pipeline (1) respectively monitor the internal pressures at both ends of the pipeline (1) until the internal pressure values ​​at both ends of the pipeline (1) differ from each other outside the expected range for a long period of time; S2: The output shaft of the motor (11) rotates, gradually releasing the vent pipe (7) wound on the winding column (4a), and the gas moving in the pipeline (1) drives the flexible airbag (8) to move in the pipeline (1). The flexible airbag (8) will deform until the air pressure in the external pressure chamber is the same as the air pressure in the pipeline (1). The first pressure sensor (6) can monitor the air pressure at the location of the flexible airbag (8) in the pipeline (1) by monitoring the air pressure in the external pressure chamber; S3: The first pressure sensor (6) monitors that the pressure value in the flexible airbag (8) is gradually decreasing. When the pressure value in the flexible airbag (8) decreases to a certain range and the pressure value no longer decreases, the motor (11) stops rotating. The control panel (13) estimates the distance moved by the flexible airbag (8) in the pipe (1) based on the number of rotations of the motor (11) and transmits the data to the staff.

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