CN216591094U

CN216591094U - Natural gas explosion-proof automatic closing device

Info

Publication number: CN216591094U
Application number: CN202122790417.0U
Authority: CN
Inventors: 叶忠健
Original assignee: Yichang Medium Combustion City Gas Development Co ltd
Current assignee: Yichang Medium Combustion City Gas Development Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-05-24
Anticipated expiration: 2031-11-15

Abstract

Explosion-proof self-closing device of natural gas, including the gas pipeline, the gas pipeline includes bend section and horizontal segment, the bend section sets up in sealed water tank, install first valve and second valve on bend section both ends horizontal segment respectively, the horizontal segment passes through inlet tube and water tank bottom intercommunication between first valve and the bend section, install the third valve on the inlet tube, the switch-on has the blast pipe on the horizontal segment between second valve and bend section, install the fourth valve on the blast pipe, the intake pipe is passed through at the water tank top and the air supply switch-on, still include the controller, the first valve of controller control, the second valve, third valve and fourth valve. The utility model is used for solving the problem of low explosion-proof safety of the existing natural gas pipeline.

Description

Natural gas explosion-proof automatic closing device

Technical Field

The utility model relates to a natural gas explosion-proof automatic closing device.

Background

The network-connected natural gas pipeline needs to be cut off emergently to prevent natural gas explosion in some times, for example, gas leakage, pressure drop rapidly, smoke sensor alarm and the like, the existing cut-off closing mainly depends on an electric valve, but the distances between gas pipelines on two sides of the electric valve are very close, if the pipeline on one side of the electric valve catches fire and explodes, open fire of gas combustion or generated heat can be easily conducted to gas in the pipeline on the other side of the electric valve, so that the gas pipeline on the other side catches fire and explodes, explosion prevention failure is caused, and the safety is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a natural gas anti-explosion automatic closing device which is used for solving the problem that the existing natural gas pipeline is low in anti-explosion safety.

In order to solve the problems, the technical scheme of the utility model is as follows:

explosion-proof self-closing device of natural gas, including the gas pipeline, the gas pipeline includes bend section and horizontal segment, the bend section sets up in sealed water tank, install first valve and second valve on bend section both ends horizontal segment respectively, the horizontal segment passes through inlet tube and water tank bottom intercommunication between first valve and the bend section, install the third valve on the inlet tube, the switch-on has the blast pipe on the horizontal segment between second valve and bend section, install the fourth valve on the blast pipe, the intake pipe is passed through at the water tank top and the air supply switch-on, still include the controller, the first valve of controller control, the second valve, third valve and fourth valve.

The beneficial effects of the utility model are as follows: after the controller receives the close signal, close first valve and second valve simultaneously, open third valve and fourth valve, water in the promotion water tank by the air supply enters into crooked section, and discharge the well remaining natural gas of crooked section, form a longer water seal around making the gas pipeline, the long distance that at first can realize the gas pipeline cuts off completely and closes, secondly can utilize the water to prevent the gas pipeline temperature conduction, make the gas pipeline thoroughly isolated around the messenger, the gas pipeline cuts off simultaneously and closes rapidly.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: the water supply system comprises a horizontal section 1, a second valve 2, a fourth valve 3, a drain valve 4, a water tank 5, an expansion joint 6, an air inlet pipe 7, a bending section 8, a water inlet pipe 9, a third valve 10, a stop valve 11, a one-way valve 12, a tank cover 13, a safety valve 14, an exhaust pipe 15 and a first valve 16.

Detailed Description

As shown in fig. 1, the natural gas explosion-proof automatic closing device comprises a gas pipeline, the gas pipeline comprises a bending section 8 and a horizontal section 1, the bending section 8 is arranged in a sealed water tank 5, the water tank 5 is provided with a tank cover, 3/4 water is filled in the water tank 5, a first valve 16 and a second valve 2 are respectively arranged on the horizontal section 1 at the two ends of the bending section 8, the horizontal section 1 between the first valve 16 and the bending section 8 is communicated with the bottom of the water tank 5 through a water inlet pipe 9, a third valve 10 is arranged on the water inlet pipe 9, an exhaust pipe 15 is communicated with the horizontal section 1 between the second valve 2 and the bending section 8, the exhaust pipe 15 is provided with a fourth valve 3, the top of the water tank 5 is communicated with an air source through an air inlet pipe 7, the air source is compressed air, the exhaust pipe further comprises a controller, the controller controls the first valve 16, the second valve 2, the third valve 10 and the fourth valve 3, and the controller is a PLC (programmable logic controller).

The working principle of the utility model is as follows: after the PLC controller receives the natural gas pipeline cutting signal, the first valve 16 of controller control and second valve 2 close, third valve 10 and fourth valve 3 open, compressed air promotes water tank 5 well water and enters into bend section 8 by inlet tube 9, the water that gets into in the bend section 8 is with the remaining natural gas discharge in the bend section 8, after 3S ~5S, fourth valve 3 closes, water is sealed in bend section 8, make it form the water seal in the natural gas pipeline, thoroughly isolated around the bend section 8 of natural gas pipeline.

The first valve 16, the second valve 2, the third valve 10 and the fourth valve 3 are all pneumatic actuating valves. Compared with an electromagnetic valve, the pneumatic execution valve does not generate electric spark or generate short circuit phenomenon, and is safer and more reliable to use.

A check valve 12 and a shutoff valve 11 are mounted on the intake pipe 7. When the water tank 5 needs to be overhauled, the stop valve 11 can be closed; the check valve 12 prevents the compressed air in the upper airtight space of the water tank 5 from overflowing when the compressed air is not supplied from the air supply.

An expansion joint 6 is arranged on the bending section 8, a safety valve 14 is arranged at the top of the water tank 5, and the strength of the expansion joint 6 is lower than that of a gas pipeline. If the first valve 16 or the second valve 2 is closed and fails, the pipeline is exploded again, the pipeline can be exploded at the expansion joint 6 preferentially, if the expansion joint 7 is exploded, and after the generated high-pressure gas rushes the safety valve 14, water can be exploded out from the expansion joint and enters the bent section 8, and meanwhile, flames generated by expansion and explosion are eliminated, so that the fire spreading and heat conduction are prevented, and the safety is further improved.

A drain valve 4 is installed at the bottom of the water tank 5. When the water tank 5 needs to be overhauled, the drain valve 4 can be opened to empty water, so that people can conveniently overhaul the water tank 5.

Claims

1. Explosion-proof self-closing device of natural gas, including the gas pipeline, its characterized in that: the gas pipeline includes bending section (8) and horizontal segment (1), bending section (8) set up in sealed water tank (5), install first valve (16) and second valve (2) on bending section (8) both ends horizontal segment (1) respectively, horizontal segment (1) is through inlet tube (9) and water tank (5) bottom intercommunication between first valve (16) and bending section (8), install third valve (10) on inlet tube (9), it has blast pipe (15) to put through on horizontal segment (1) between second valve (2) and bending section (8), install fourth valve (3) on blast pipe (15), intake pipe (7) and air supply switch-on are passed through at water tank (5) top, still include the controller, first valve of controller control (16), second valve (2), third valve (10) and fourth valve (3).

2. The natural gas explosion-proof automatic closing device according to claim 1, characterized in that: the first valve (16), the second valve (2), the third valve (10) and the fourth valve (3) are all pneumatic executive valves.

3. The natural gas explosion-proof automatic closing device according to claim 1, characterized in that: the air inlet pipe (7) is provided with a one-way valve (12) and a stop valve (11).

4. The natural gas explosion-proof automatic closing device according to claim 1, characterized in that: an expansion joint (6) is arranged on the bending section (8), and a safety valve (14) is arranged at the top of the water tank (5).

5. The natural gas explosion-proof automatic closing device according to claim 1, characterized in that: the bottom of the water tank (5) is provided with a drain valve (4).