Gas pipeline under-pressure leak-proof endoscope and detection method

Abstract

The invention belongs to the technical field of gas conveying equipment, and particularly relates to a gas pipeline under-pressure leak-proof endoscope and a detection method.According to the gas pipeline under-pressure leak-proof endoscope, a camera is arranged at the lower end of a barrel, and an opening in the upper end of the barrel is sealed through a sealing cover, so that arrangement of the camera and wire harnesses of the camera is facilitated; and coal gas is prevented from leaking from the inner cavity of the barrel. The sealing connecting cover is sleeved on the outer side of the cylinder body, and the cylinder body is hermetically connected with the sealing connecting cover in a vertically movable manner, so that after the sealing connecting cover is hermetically connected with the pressure detection pipe of the gas pipeline, the vertical position of the camera can be adjusted through the cylinder body, and the camera can be conveniently adjusted under the condition that the gas pipeline normally conveys pressure gas. Video inspection is carried out on the blockage condition in the gas pipeline, gas leakage is prevented, meanwhile, blockage can be immediately cleaned through the injector head after problems are inspected, the cleaning process and the cleaning effect can be monitored in the whole process, and gas does not need to be shut down.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas transmission equipment, and particularly relates to a pressure-resistant anti-leakage endoscope for gas pipelines and a detection method thereof. Background Art

[0002] In the use of gas pipelines, the branch pipes in the basement of blast furnace gas are at the lowest end of the pipeline. The blast furnace gas condensate has strong corrosiveness to the pipeline, and the amount of condensate and the residence time in the pipeline directly affect the service life of the pipeline. Whether the drainer in the basement discharges water is an important basis for judging whether the drainer and the pipeline connected to the drainer are blocked. The drainage volume of the drainer is an important basis for judging the water content of the gas. However, in actual production, it is not easy to find the semi-blockage situation at the connection between the branch pipe and the drainer. When this situation occurs, it does not affect the drainage volume of the drainer and the air pressure at the inspection port of the connecting pipe is normal. However, in the long run, it will cause an increase in condensate in the pipeline, an increase in the contact area between the condensate and the pipeline, an increase in the corrosion area of the pipeline, accelerating the pipeline damage and greatly reducing the service life of the blast furnace gas branch pipes in the basement.

[0003] At present, it is generally detected by observing the drainage situation of the drainer connected to the machine-coke side in the basement and the pressure measuring port at the part of the drain pipe connected to the branch pipe. This method can only detect whether it is completely blocked and cannot judge the semi-blockage situation, resulting in maintenance personnel being unable to carry out treatment for the problem. Summary of the Invention

[0004] The main purpose of the present invention is to provide a pressure-resistant anti-leakage endoscope for gas pipelines and a detection method thereof, so as to solve the problem that the semi-blocked state at the connection port between the branch pipe and the drain pipe of the drainer causes the accumulation of blast furnace gas condensate to aggravate the corrosion of the pipeline.

[0005] Without affecting the normal operation of the gas pipeline, the pressure-resistant anti-leakage endoscope of the present application solves the blockage inspection at the connection port, treats the blockage point, and prevents the problem of pipeline water accumulation accelerating pipeline damage, thereby extending the service life of the pipeline.

[0006] The technical problem to be solved by the present invention is achieved by the following technical solutions: A pressure-resistant anti-leakage endoscope for gas pipelines includes a sealed connection cover, a lifting cylinder, a camera, a display screen, a spray head, an input pipe and a water supply system;

[0007] The lifting cylinder includes a cylinder body and a sealing cover. The upper end of the cylinder body is open, and the sealing cover is used to seal the upper end opening of the cylinder body;

[0008] The sealed connection cover is sleeved outside the cylinder body, and the cylinder body is hermetically connected to the sealed connection cover in a vertically movable manner;

[0009] The camera is arranged at the lower end of the cylinder body and is connected to the display screen;

[0010] The spray head is arranged at the lower end of the cylinder body and has the same orientation as the camera. The spray head is connected to the water supply system through an input pipe. By arranging the spray head at the lower end of the cylinder body and connecting it to the water supply system through the input pipe, when sediment blockages are found in the gas pipeline, the spray head can be used to achieve synchronous cleaning.

[0011] Preferably, the present invention further includes a control valve, and the control valve is arranged on the input pipe. When the spray head is not in use, the control valve on the input pipe can be closed to prevent gas from leaking from the input pipe.

[0012] Preferably, the present invention further includes a U-shaped pipe, and the U-shaped pipe is arranged on the input pipe with its opening facing upward. By arranging the U-shaped pipe with an upward opening on the input pipe, the state of water is maintained in the U-shaped pipe to achieve the effect of water seal and prevent gas from leaking from the input pipe.

[0013] Preferably, the water supply system of the present invention includes a booster pump connected to the input pipe. The cleaning liquid is pressurized by the booster pump and then introduced into the input pipe, so as to effectively clean the blockages in the gas pipeline by using the spray head.

[0014] Preferably, the cylinder body is slidably arranged on the sealed connection cover, and a sealing ring is arranged between the sealed connection cover and the cylinder body. By slidably arranging the cylinder body on the sealed connection cover, it is convenient to adjust the up and down height and observation angle of the cylinder body to achieve observation at different angles. The sealing ring is used to seal the gap between the sealed connection cover and the cylinder body to prevent gas leakage.

[0015] Preferably, the camera is equipped with a lighting device. In order to facilitate the observation of the internal situation of the gas pipeline, a lighting device is configured on the camera, which helps to clearly display the blockage condition inside the gas pipeline.

[0016] Preferably, the lower end of the cylinder body is sealed, and the camera and the spray head are arranged on the side wall of the cylinder body and are respectively sealed and connected to the side wall of the cylinder body. By sealing the lower end of the cylinder body, arranging the camera and the spray head on the side wall of the cylinder body, and sealingly connecting the camera and the spray head to the side wall of the cylinder body respectively, the sealing effect of the overall structure of the endoscope is further improved, and the risk of gas leakage from the inner cavity of the cylinder body is reduced.

[0017] The present invention also discloses a method for detecting the pressure of a gas pipeline with pressure. Using the above-mentioned endoscope for preventing gas leakage with pressure in the gas pipeline, the gas pipeline is provided with a pressure detection pipe, the pressure detection pipe communicates with the gas pipeline, and a safety valve is arranged in the middle of the pressure detection pipe;

[0018] During detection, first seal and connect the sealing connection cover to the upper end of the pressure detection pipe, then open the safety valve, and insert the cylinder body into the gas pipeline. Since a safety valve is provided in the middle of the pressure detection pipe on the gas pipeline, therefore, the pressure-resistant leak-proof endoscope for gas pipelines can be first connected to the pressure detection pipe, then the safety valve is opened, and the cylinder body is inserted into the gas pipeline to check for blockage conditions, avoiding gas leakage.

[0019] After the inspection is completed, the bottom of the cylinder body can be lifted above the safety valve. After closing the safety valve, the pressure-resistant leak-proof endoscope for gas pipelines is then removed from the pressure detection pipe, effectively ensuring the sealing of the gas pipeline and avoiding gas leakage.

[0020] Preferably, in the present invention, when it is found that there is a semi-blockage in the gas pipeline, the control valve and the water supply system are opened, and the blocking object is cleaned by using the spray head. When the blocking object is found, on-line cleaning can be carried out, which is safer and more efficient.

[0021] Preferably, in the present invention, the sealing connection cover is threadedly connected to the pressure detection pipe. The sealing is achieved by the threaded connection between the sealing connection cover and the pressure detection pipe, which is convenient for operation and improves the detection efficiency.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The pressure-resistant leak-proof endoscope for gas pipelines of the present invention is provided with a camera at the lower end of the cylinder body, and the upper opening of the cylinder body is sealed by using a sealing cover, which is convenient for arranging the camera and its wire harness, and avoids gas leakage from the inner cavity of the cylinder body. The sealing connection cover is sleeved outside the cylinder body. Since the cylinder body can be movably and sealingly connected to the sealing connection cover up and down, therefore, after the sealing connection cover is sealingly connected to the pressure detection pipe of the gas pipeline, the up and down position of the camera can be adjusted through the cylinder body, and the blockage condition in the gas pipeline can be observed under the condition that the gas pipeline is normally transporting pressurized gas, and it is displayed on the display screen in real time.

[0023] That is, the present invention can perform video inspection on the blockage condition without affecting the normal operation of the gas pipeline, prevent gas leakage, and at the same time, after the problem is detected, the blocking object can be immediately cleaned by using the spray head, and the cleaning process and cleaning effect can be monitored throughout the process without shutting down the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the pressure-resistant leak-proof endoscope for gas pipelines according to an embodiment of the present invention;

[0025] Figure 2 It is an operation schematic diagram of the pressure detection method for gas pipelines of the present invention;

[0026] In the figure, 1 is the sealing connection cover, 2 is the lifting cylinder, 3 is the camera, and 4 is the display screen;

[0027] 21 is the cylinder body, and 22 is the sealing cover;

[0028] 5 Spray head, 6 Input pipe, 7 Control valve, 8 U-shaped pipe, 9 Booster pump, 10 Gasket;

[0029] 100 Gas drainer, 200 Gas pipeline, 201 Drainage pipe of the drainer, 300 Pressure detection pipe, 301 Safety valve. Specific implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings.

[0031] As Figure 1 shown, a pressure-resistant leak-proof endoscope for a gas pipeline includes a sealed connection cover 1, a lifting cylinder 2, a camera 3, a display screen 4, a spray head 5, an input pipe 6 and a water supply system.

[0032] The lifting cylinder 2 includes a cylinder body 21 and a sealing cover 22. The upper end of the cylinder body 21 is open, and the sealing cover 22 is used to seal the upper end opening of the cylinder body 21.

[0033] The sealed connection cover 1 is sleeved outside the cylinder body 21, and the cylinder body 21 is hermetically connected to the sealed connection cover 1 in a vertically movable manner.

[0034] The camera 3 is arranged at the lower end of the cylinder body 21 and is connected to the display screen 4 through a data wire.

[0035] The spray head 5 is arranged at the lower end of the cylinder body 21 and is oriented in the same direction as the camera 3. The spray head 5 is connected to the water supply system through the input pipe 6, and the water supply system is used for pressurized water supply.

[0036] Channels matching the data wire and the input pipe 6 are arranged on the sealing cover 22, and the data wire and the input pipe 6 are hermetically connected to the corresponding channels. The sealing cover 22 is threadedly connected to the cylinder body 21.

[0037] The pressure-resistant leak-proof endoscope for the gas pipeline further includes a control valve 7. The control valve 7 is arranged on the input pipe 6, and the control valve 7 is arranged outside the cylinder body 21.

[0038] The pressure-resistant leak-proof endoscope for the gas pipeline further includes a U-shaped pipe 8. The U-shaped pipe 8 is arranged on the input pipe 6, and the U-shaped pipe 8 is arranged with its opening upward.

[0039] The water supply system includes a booster pump 9 connected to the input pipe 6.

[0040] The cylinder body 21 is slidably arranged on the sealed connection cover 1, and a sealing ring is arranged between the sealed connection cover 1 and the cylinder body 21. The sealing ring is made of rubber (not shown in the figure).

[0041] The camera 3 is equipped with a lighting device (not shown in the figure).

[0042] The lower end of the cylinder body 21 is sealed, and the camera 3 and the injection head 5 are arranged on the side wall of the cylinder body 21 and are respectively hermetically connected to the side wall of the cylinder body 21. Specifically, the camera 3 and the injection head 5 are embedded in the side wall of the cylinder body 21.

[0043] As Figure 2 described, a method for detecting the pressure of a gas pipeline is used for detecting and cleaning the gas pipeline 200 above the gas drainer 100. Using the above-mentioned endoscope for preventing leakage under pressure of the gas pipeline, there is a gas pipeline 200 above the gas drainer 100. The gas pipeline 200 is connected to the gas drainer 100 through a drainer drain pipe 201. The drainer drain pipe 201 is used to drain the accumulated liquid in the gas pipeline 200 into the gas drainer 100.

[0044] The gas pipeline 200 is provided with a pressure detection pipe 300 along the radial direction. The pressure detection pipe 300 communicates with the gas pipeline 200, and a safety valve 301 is arranged in the middle of the pressure detection pipe 300. In this embodiment, the safety valve 301 is a ball valve.

[0045] During detection, first hermetically connect the sealing connection cover 1 to the upper end of the pressure detection pipe 300, then open the safety valve 301, and insert the cylinder body 21 into the gas pipeline 200.

[0046] When it is found that there is a semi-blockage in the gas pipeline 200, open the control valve 7 and the water supply system, and use the injection head 5 to clean the blockage.

[0047] The sealing connection cover 1 is threadedly connected to the pressure detection pipe 300.

[0048] Working principle: As Figure 1 and Figure 2 shown, when the drainage of the drainer is abnormal, connect the device to the pressure detection port at the end of the gas pipeline 200, that is, the pressure detection pipe 300. By threadedly connecting the sealing connection cover 1 to the pressure detection pipe 300, there is an annular sealing gasket 10 between the sealing connection cover 1 and the upper end face of the pressure detection pipe 300. The sealing gasket 10 is used to prevent gas leakage here. By moving the cylinder body 21 up and down, the camera 3 is transported to the observation position, and the video signal is transmitted to the display screen 4 through the data wire to check the blockage condition of the diversion pipe orifice or the bottom of the pipeline.

[0049] When the drainer drain pipe is blocked, place the device in a suitable position, open the control valve 7, the water flow passes through the conduit and sprays out from the injection head 5, washing the blockage into the drainer drain pipe and into the drainer. To ensure the flushing effect, the water flow is pressurized by a booster pump 9, and the U-shaped pipe 8 prevents gas backflow and plays the role of a U-shaped water seal.

[0050] The principle is the same when detecting the coke oven gas pipeline. Due to the nature of the blockage in the coke oven gas pipeline, there is no need for a water flushing device and only detection is required.

Claims

1. A gas pipeline pressure leak-proof endoscope, characterized by: It comprises a sealing connection cover (1), a lifting cylinder (2), a camera (3), a display screen (4), a spray head (5), an input pipe (6) and a water supply system; The lifting cylinder (2) comprises a cylinder body (21) and a sealing cover (22); the upper end of the cylinder body (21) is provided with an opening, and the sealing cover (22) is used to seal the upper end opening of the cylinder body (21); The sealing connection cover (1) is sleeved on the outside of the cylinder (21), and the cylinder (21) can be moved up and down to be sealed and connected to the sealing connection cover (1); The camera (3) is arranged at the lower end of the cylinder (21) and is connected to the display screen (4); The spray head (5) is arranged at the lower end of the cylinder (21) and is aligned with the direction of the camera (3). The spray head (5) is connected to the water supply system via an input pipe (6).

2. The gas pipeline pressure-proof leak-proof endoscope according to claim 1 is characterized in that: It also comprises a control valve (7), and the control valve (7) is arranged on the input pipe (6).

3. The gas pipeline pressure-proof leak-proof endoscope according to claim 1 is characterized in that: It also comprises a U-shaped tube (8), the U-shaped tube (8) being arranged on the input tube (6), and the opening of the U-shaped tube (8) being arranged upward.

4. The gas pipeline pressure-proof leak-proof endoscope according to claim 1 is characterized in that: The water supply system comprises a booster water pump (9) connected to an input pipe (6).

5. The gas pipeline pressure-proof leak-proof endoscope according to claim 1 is characterized in that: The cylinder (21) is slidably arranged on the sealing connection cover (1) up and down, and a sealing ring is arranged between the sealing connection cover (1) and the cylinder (21).

6. The gas pipeline pressure leak-proof endoscope according to claim 1, characterized in that: The camera (3) is provided with a lighting device.

7. The gas pipeline pressure-proof leak-proof endoscope according to claim 1 is characterized by: The lower end of the cylinder (21) is sealed, and the camera (3) and the injection head (5) are arranged on the side wall of the cylinder (21) and are respectively sealed and connected to the side wall of the cylinder (21).

8. A method for detecting a gas pipeline under pressure, using the gas pipeline under pressure anti-leakage endoscope according to any one of claims 1 to 7, characterized in that: The gas pipeline (200) is provided with a pressure detection tube (300), the pressure detection tube (300) is in communication with the gas pipeline (200), and a safety valve (301) is provided in the middle of the pressure detection tube (300); During the test, the sealing connection cover (1) is first sealedly connected to the upper end of the pressure detection tube (300), and then the safety valve (301) is opened, and the cylinder (21) is extended into the gas pipeline (200).

9. The gas pipeline pressure detection method according to claim 8, characterized in that: When it is found that the gas pipeline (200) is semi-blocked, the control valve (7) and the water supply system are opened, and the blockage is cleared using the spray head (5).

10. The gas pipeline pressure detection method according to claim 8, characterized in that: The sealed connection cover (1) is threadedly connected to the pressure detection tube (300).

Images