Pipeline air tightness detection device

Abstract

The utility model relates to the technical field of pipeline airtightness detection, and discloses a pipeline airtightness detection device which comprises a breather pipe, a first air bag and two second air bags, one end of the breather pipe is connected with an air source, the other end of the breather pipe is connected with a three-way valve, the first ventilation end of the three-way valve is communicated with the first air bag, and the second ventilation end of the three-way valve is communicated with the second air bag. The first air bag is connected with two air outlet pipes, the two air outlet pipes are communicated with the two second air bags respectively, the second ventilation end of the three-way valve is connected with an air inlet pipe, the air inlet pipe penetrates through the first air bag to be communicated with a pipeline, and the first air bag is connected with the outer wall of the air inlet pipe in a sealed mode. And a first pressure detector is installed between the first ventilation end and the first air bag, and a second pressure detector is installed on the air inlet pipe. According to the pipeline sealing detection device, the situation that the first air bag and the second air bag which block the pipeline have problems can be eliminated, so that interference factors during pipeline sealing detection are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline tightness detection, and in particular to a pipeline air tightness detection device. Background Art

[0002] Pipeline tightness testing is the basis for ensuring the safe operation of the pipeline system. Whether it is transporting water, gas or other fluid media, the tightness of the pipeline is the key to ensure the normal flow of the medium and prevent leakage. Once a leak occurs, it may not only cause medium loss and energy waste, but also pose a threat to the surrounding environment and personnel safety. Especially in the process of installing pipelines section by section, the tightness of the pipeline joints must be tested, and if a leak occurs, it should be handled in time.

[0003] Pipeline tightness testing can be done by water tightness or air tightness. Water tightness testing is to fill water into the pipeline to directly observe whether there is water seepage from the outside of the pipeline, but a large amount of water is required. Air tightness testing is more water-saving. It mainly involves passing high-pressure gas into the pipeline, leaving it for a period of time, and then checking whether the air pressure in the pipeline changes.

[0004] When each section of pipeline is tested for air tightness, it is necessary to keep the pipeline in a closed environment. Blind plates are often used for isolation. Blind plates are plate-shaped devices used to completely close the pipeline opening. After installation, they can effectively prevent gas or liquid from passing through. During the pipeline air tightness test, it is difficult to determine whether the sealing function of the blind plate is maintained, resulting in an increase in interference factors during pipeline air tightness testing. Utility Model Content

[0005] In order to reduce interference factors on pipeline airtightness, the present application provides a pipeline airtightness detection device.

[0006] The present application provides a pipeline air tightness detection device, which adopts the following technical solution:

[0007] A pipeline air tightness detection device comprises a ventilation pipe, a first air bag and two second air bags, wherein one end of the ventilation pipe is connected to an air source, and the other end of the ventilation pipe is connected to a three-way valve, the first ventilation end of the three-way valve is connected to the first air bag, the first air bag is connected to two outlet pipes, and the two outlet pipes are respectively connected to the two second air bags, the second ventilation end of the three-way valve is connected to an air inlet pipe, the air inlet pipe passes through the first air bag and is connected to the pipeline, the first air bag is sealed to the outer wall of the air inlet pipe, a first pressure detector is installed between the first ventilation end and the first air bag, and a second pressure detector is installed on the air inlet pipe.

[0008] By adopting the above technical scheme, the ventilation pipe can pass the gas of the gas source into the first airbag and the second airbag through the first ventilation end, and can also pass the gas into the pipeline through the second ventilation end. Before testing the air tightness of the pipeline, first seal the two second airbags on the two pipelines respectively. The two pipelines are generally connected to an inspection well. The second airbag is installed in the inspection well. After the gas is passed into the first airbag and the two second airbags, the first airbag swells and fits on the inner wall of the pipeline, and the second airbag swells and fits on the inner wall of the inspection well. The first airbag blocks the inspection well mouth, and the two second airbags seal and block the pipeline. After the pipeline between the first airbag and the second airbag is in a closed state, the second ventilation end is opened, and gas is passed into the closed pipeline, and it is left to stand for a period of time.

[0009] The first pressure detector is used to detect the pressure between the first airbag and the second airbag, and the second pressure detector detects the pressure in the closed pipeline. If the pressure of the first pressure detector changes, the first airbag and the second airbag may leak, thereby affecting the pipeline air tightness detection. If the first pressure detector remains unchanged and the pressure of the second pressure detector changes, it means that there is a problem with the sealing of the pipeline itself, and the problem of the first airbag and the second airbag blocking the pipeline is ruled out, thereby reducing interference factors during pipeline sealing detection.

[0010] Optionally, the ventilation pipe is connected to a bracket.

[0011] By adopting the above technical solution, the bracket is installed outside the inspection well. When the first airbag is not yet attached to the inner wall of the inspection well, the bracket can support the first airbag.

[0012] Optionally, the bracket includes a connecting seat and a supporting leg, the supporting leg is connected to the connecting seat, and the ventilation pipe is slidably installed on the connecting seat.

[0013] By adopting the above technical solution, the supporting legs are inserted outside the inspection well to support the connecting seat. When the first airbag gradually swells and fits on the inspection well, the first airbag may change the position of the air intake pipe, so the air intake pipe is slidably installed on the mounting seat and can change according to the position of the first airbag.

[0014] Optionally, a through hole for the ventilation pipe to pass through is opened on the connection seat, and a distance is left between the ventilation pipe and the inner wall of the through hole. A connecting rod is installed on the ventilation pipe, and the connecting rod is in contact with the upper surface of the connection seat.

[0015] By adopting the above technical solution, the ventilation pipe is installed on the mounting seat through the connecting rod, and the distance between the ventilation pipe and the perforation provides space for the ventilation pipe to move.

[0016] Optionally, one end of the connecting rod is hinged to the outer wall of the ventilation pipe, and when the connecting rod rotates downward, the other end of the connecting rod is close to the ventilation pipe, and the outer wall of the ventilation pipe is installed with a limit piece that limits the upward rotation of the connecting rod.

[0017] By adopting the above technical solution, when the ventilation pipe needs to cooperate with the connecting rod and the mounting seat, the connecting rod and the upper surface of the mounting seat are in contact, the mounting seat limits the downward rotation of the connecting rod, and the limit piece limits the upward rotation of the connecting rod. If the ventilation pipe needs to be removed from the bracket, the ventilation pipe is moved upward, and the connecting rod leaves the mounting seat and then rotates downward, and the connecting rod and the ventilation pipe pass through the perforation together to leave the bracket.

[0018] Optionally, the limiting member is a limiting block, and the limiting block is provided with a limiting groove.

[0019] By adopting the above technical solution, the connecting rod can enter the limiting groove, so that the limiting block can better limit the connecting rod.

[0020] Optionally, the ventilation pipe and the air source can be detachably mounted.

[0021] By adopting the above technical solution, it is convenient to carry, and if the airtight detection device is not used for a long time, the air source can be used for other purposes.

[0022] Optionally, the air outlet pipe between the first airbag and the second airbag is detachably mounted.

[0023] By adopting the above technical solution, when detecting the air tightness of different pipelines, the installation position between the first airbag and the second airbag is determined and then the air outlet pipe is connected. The air outlet pipes of different lengths can be replaced according to the position between the first airbag and the second airbag.

[0024] In summary, the present application includes at least one of the following beneficial effects:

[0025] 1. It can eliminate the problems with the first and second airbags that block the pipeline, reducing the interference factors of pipeline sealing;

[0026] 2. The bracket can support the first airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the overall structure and pipeline coordination of an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of a ventilation pipe in an embodiment of the present application being installed outside a manhole through a bracket;

[0029] Figure 3 yes Figure 1 A magnified schematic diagram of point A;

[0030] Figure 4 yes Figure 2 An enlarged schematic diagram of point B.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. ventilation pipe; 11. connecting rod; 12. limiting block; 121. limiting groove; 2. first air bag; 3. second air bag; 4. air inlet pipe; 5. three-way valve; 6. air outlet pipe; 7. first pressure detector; 8. second pressure detector; 9. air pipe mounting seat; 10. bracket; 101. connecting seat; 102. supporting leg; 103. perforation. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The present application embodiment discloses a pipeline air tightness detection device. Figure 1 A pipeline air tightness detection device includes a vent pipe 1, a first airbag 2 and two second airbags 3. One end of the vent pipe 1 is connected to an air source, which may be an air compressor. The other end of the vent pipe 1 is connected to a three-way valve 5. The first vent end of the three-way valve 5 is connected to the first airbag 2 through a pipeline. The first airbag 2 is connected to two outlet pipes 6, which are respectively connected to the second airbag 3, so that the air source can enter the first airbag 2 and the second airbag 3 through the first vent end. After the first airbag 2 is inflated, it mainly blocks the wellhead of the inspection well. After the two second airbags 3 are inflated, they mainly block the two pipes to be inspected that are connected to the inspection well. The first airbag 2 and the second airbag 3 are set so that the pipeline to be inspected is in a closed state, and the air source is placed outside the inspection well.

[0034] Reference Figure 1 The second vent of the three-way valve 5 is connected to the air inlet pipe 4. Since the first airbag 2 is used to block the inspection well after being inflated, the air inlet pipe 4 passes through the interior of the first airbag 2 and is connected to the pipeline. The outer wall of the first airbag 2 and the air inlet pipe 4 are sealed and connected. The three-way valve 5 can control whether the high-pressure gas of the gas source enters the first airbag 2 and the second airbag 3, or enters the pipeline to be detected.

[0035] Reference Figure 1, a first pressure detector 7 is installed on the air pipe between the first ventilation end of the three-way valve 5 and the first airbag 2, and a second pressure detector 8 is installed on the air inlet pipe 4. The first ventilation end is first opened to inflate the first airbag 2 and the second airbag 3. When the first airbag 2 and the second airbag 3 respectively block the inspection well and the pipeline, the air in the first airbag 2 and the second airbag 3 reaches a certain pressure value, and the first pressure detector 7 will display the pressure value in the first airbag 2 and the second airbag 3. During the pipeline air tightness test, if the pressure of the first pressure detector 7 changes, the first airbag 2 and the second airbag 3 will be deflated, which may affect the blocking effect and cause the tested pipeline to be not in a closed state. If the first pressure detector 7 does not change, it can be ruled out that the first airbag 2 and the second airbag 3 have not blocked the inspection well and the pipeline. If the second pressure detector 8 changes, it means that there is a leak in the pipeline.

[0036] Reference Figure 1 The air outlet pipe 6 between the first airbag 2 and the second airbag 3 can be detachably installed. The first airbag 2 and the second airbag 3 have an air pipe mounting seat 9. The air pipe and the air pipe mounting seat 9 are threadedly connected. The air pipe mounting seat 9 is sealed and rotatably installed on the threaded part. The threaded part is mainly rotated to make the air pipe and the air pipe mounting seat 9 sealed and connected together.

[0037] Reference Figure 2 The ventilation pipe 1 is connected to a bracket 10, and the bracket 10 includes a connection seat 101 and a support leg 102. The support leg 102 has a plurality of support legs, and one end of each of the plurality of support legs 102 is connected to the connection seat 101. The ventilation pipe 1 is slidably mounted on the connection seat 101.

[0038] Reference Figure 3 The connection seat 101 is provided with a through hole 103 for the ventilation pipe 1 to pass through. The inner diameter of the through hole 103 is larger than the outer diameter of the ventilation pipe 1. After the ventilation pipe 1 passes through the through hole 103, a gap can be left between the ventilation pipe 1 and the inner wall of the through hole 103. A connecting rod 11 is installed on the ventilation pipe 1. The ventilation pipe 1 contacts the upper surface of the connection seat 101 through the connecting rod 11, so that the ventilation pipe 1 will not be separated from the connection seat 101 downward, so that the bracket 10 can support the ventilation pipe 1 and the first airbag 2 connected to the ventilation pipe 1.

[0039] One end of the connecting rod 11 is hinged on the outer wall of the vent pipe 1. When the connecting rod 11 rotates downward, it gradually approaches the vent pipe 1. When the vent pipe 1 is installed on the connecting seat 101, the connecting seat 101 limits the downward rotation of the connecting rod 11. A limiting member for limiting the upward rotation of the connecting rod 11 is installed on the outer wall of the vent pipe 1. The limiting member is a limiting block 12. When the vent pipe 1 is supported by the bracket 10, the connecting rod 11 is located between the connecting seat 101 and the limiting block 12.

[0040] Reference Figure 4The limiting block 12 is provided with a limiting groove 121 for fitting with the outer wall of the connecting rod 11 , and the connecting seat 101 may also be provided with a groove, so that the vent pipe 1 can be stably installed on the bracket 10 .

[0041] The ventilation pipe 1 and the air source can be detachably mounted, and the detachable mounting method includes threaded connection. When the ventilation pipe 1 moves upward and leaves the connecting seat 101, the connecting rod 11 can rotate downward and approach the ventilation pipe 1, and the ventilation pipe 1 can leave the bracket 10 together with the connecting rod 11.

[0042] The implementation principle of a pipeline air tightness detection device in the embodiment of the present application is:

[0043] The first airbag 2 and the second airbag 3 are connected, the first pressure detector 7 detects the pressure of the first airbag 2 in real time, and the second pressure detector 8 detects the pressure change in the pipeline in real time. If there is a problem with the sealing of the pipeline itself, only the pressure value of the second pressure detector 8 will change. If there is a problem with the sealing of the blocked pipeline, the pressure values ​​of the first pressure detector 7 and the second pressure detector 8 will change. Therefore, when testing the air tightness of the pipeline, it is possible to observe whether the first pressure detector 7 changes, so as to find out whether there is a problem with the sealing of the blocked pipeline and reduce interference factors in the pipeline sealing detection.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipeline air tightness detection device, characterized in that: The invention comprises a ventilation pipe (1), a first air bag (2) and two second air bags (3), wherein one end of the ventilation pipe (1) is connected to an air source, and the other end of the ventilation pipe (1) is connected to a three-way valve (5), wherein a first ventilation end of the three-way valve (5) is connected to the first air bag (2), and the first air bag (2) is connected to two outlet pipes (6), and the two outlet pipes (6) are respectively connected to the two second air bags (3), and a second ventilation end of the three-way valve (5) is connected to an inlet pipe (4), and the inlet pipe (4) passes through the first air bag (2) and is connected to a pipeline, and the outer walls of the first air bag (2) and the inlet pipe (4) are sealed and connected, and a first pressure detector (7) is installed between the first ventilation end and the first air bag (2), and a second pressure detector (8) is installed on the inlet pipe (4).

2. A pipeline air tightness detection device according to claim 1, characterized in that: The ventilation pipe (1) is connected to a bracket (10).

3. A pipeline air tightness detection device according to claim 2, characterized in that: The bracket (10) comprises a connecting seat (101) and a supporting leg (102); the supporting leg (102) is connected to the connecting seat (101); and the ventilation pipe (1) is slidably mounted on the connecting seat (101).

4. A pipeline air tightness detection device according to claim 3, characterized in that: The connection seat (101) is provided with a through hole (103) for the ventilation pipe (1) to pass through, and a distance is left between the ventilation pipe (1) and the inner wall of the through hole (103). A connecting rod (11) is installed on the ventilation pipe (1), and the connecting rod (11) is in contact with the upper surface of the connection seat (101).

5. A pipeline air tightness detection device according to claim 4, characterized in that: One end of the connecting rod (11) is hinged on the outer wall of the ventilation pipe (1); when the connecting rod (11) rotates downward, the other end of the connecting rod (11) approaches the ventilation pipe (1); and a limiting member for limiting the upward rotation of the connecting rod (11) is installed on the outer wall of the ventilation pipe (1).

6. A pipeline air tightness detection device according to claim 5, characterized in that: The limiting member is a limiting block (12), and the limiting block (12) is provided with a limiting groove (121).

7. A pipeline air tightness detection device according to claim 1, characterized in that: The ventilation pipe (1) and the air source are detachably mounted.

8. A pipeline air tightness detection device according to claim 1, characterized in that: The air outlet pipe (6) between the first airbag (2) and the second airbag (3) is detachably mounted.

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