CN202598130U - Self-gas-supplying system controlled by pressure adjusting device of compressed natural gas - Google Patents

Abstract

The utility model relates to a self-gas-supplying system, in particular to a self-gas-supplying system controlled by a pressure adjusting device of compressed natural gas. The self-gas-supplying system comprises a pneumatic cutting valve and a pressure adjusting valve connected in series sequentially at a high-pressure inlet pipe, and an inlet of the high-pressure inlet pipe is provided with a gas distributing device. The gas distributing device is connected with the pneumatic cutting valve through a gas supplying pipe of the pneumatic cutting valve, and the gas distributing device is connected with the pressure adjusting valve through a gas supplying pipe of the pressure adjusting valve. The gas distributing device is a gas buffering distributing tank connected through a high-medium pressure adjusting device. The inlet of the high pressure inlet pipe is provided with the gas distributing device connected with the pneumatic cutting valve through the gas supplying pipe of the pneumatic cutting valve and connected with the pressure adjusting valve through the gas supplying pipe of the pressure adjusting valve, so that high-pressure natural gas is distributed through the gas distributing device and supplied to the pneumatic cutting valve of a pressure adjusting valve port, the system can work normally, an automatic gas power source is achieved by using the high-pressure natural gas itself, and cost is reduced.

Description

A self-supply system for the control of compressed natural gas pressure regulating device

technical field

The utility model relates to a self-supply system, in particular to a self-supply system used for the control of a compressed natural gas pressure regulating device. the

Background technique

In the gas supply system, the high-pressure natural gas is usually decompressed to the pressure required by the user in order to be used safely and reliably. In order to meet the requirements of safety and reliability, not only the pressure regulation system composed of gas pressure regulators is required to complete the conversion from high pressure to low pressure, and continuously supply gas to users, but also needs safety protection when overpressure. The existing practice is to connect the pneumatic shut-off valve and pressure regulating valve in series in the high-pressure inlet pipe. The pressure regulating valve needs gas to inflate the pilot, and then the pilot will give a signal to instruct the valve core in the pressure regulator valve body to open. The gas passes through the pressure regulator, and finally begins to adjust the pressure to the required value. The pneumatic shut-off valve also needs gas as a power source. the

For the safety of the entire gas supply system, it is necessary to continuously provide pressurized gas to the pressure regulator and the pneumatic shut-off valve during the gas supply period of the gas supply system. Existing pressure regulators and pneumatic shut-off valves generally use nitrogen or compressed air as the power source. Among them, nitrogen is generally contained in a single cylinder. Although the cost of nitrogen is low in the initial stage of operation, the gas cylinders need to be replaced continuously in the later maintenance. Although the compressed air does not need to be replaced, an explosion-proof compressor is required at the site of use or an air compressor room is built at a safe distance, and then connected by pipelines, the overall cost is relatively high. the

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a cost-reduced self-supply system for the control of a compressed natural gas pressure regulating device. the

The utility model is realized through the following technical solutions:

A self-supply system for the control of a compressed natural gas pressure regulating device, including a pneumatic cut-off valve and a pressure regulating valve connected in series in a high-pressure inlet pipe, the inlet of the high-pressure inlet pipe is provided with a gas distributor, and the gas distributor passes through The gas supply pipe of the pneumatic shut-off valve is connected with the pneumatic shut-off valve, and the gas distributor is connected with the pressure regulating valve through the gas supply pipe of the pressure regulating valve.

The gas distributor is a gas buffer distribution tank connected by a high and medium pressure regulator. the

The air supply pipe of the pneumatic shut-off valve is provided with a solenoid valve. the

The beneficial effects of the utility model are:

Since the inlet of the high-pressure inlet pipe is provided with a gas distributor, the gas distributor is connected to the pneumatic shut-off valve through the gas supply pipe of the pneumatic shut-off valve, and the gas distributor is connected to the pressure regulating valve through the gas supply pipe of the pressure regulating valve, so that the high-pressure natural gas passes through the gas After distribution, the distributor supplies air to the pneumatic cut-off valve at the pressure regulating valve port so that it can work normally, and the automatic pneumatic power source is realized by using the high-pressure natural gas itself, which reduces the cost.

Description of drawings

Fig. 1 is a front structural schematic view of the utility model. the

Fig. 2 is the A-A sectional schematic view of the utility model. the

In the figure: 1. Needle stop valve, 2. Connecting pipe, 3. Pressure regulator inlet joint, 4. High and medium pressure regulator, 5. Internal thread ball valve, 6. Gas buffer distribution tank, 7. Internal thread ball valve, 8. Internal thread ball valve, 9. Pressure gauge adapter, 10. Pressure gauge, 11. Internal thread ball valve, 12. Internal thread ball valve, 13. High pressure gas inlet pipe, 14. Pneumatic shut-off valve, 15. Solenoid valve, 16. Regulator. the

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. the

As shown in Figure 1, the utility model includes a pneumatic cut-off valve 14 and a pressure regulating valve 16 connected in series in the high-pressure inlet pipe 13. The air pipe is connected with the pneumatic cut-off valve, and the gas distributor is connected with the pressure regulating valve through the air supply pipe of the pressure regulating valve. the

The gas distributor is a gas buffer distribution tank 6 connected by a high and medium pressure regulator 4 . the

An electromagnetic valve 15 is arranged on the air supply pipe of the pneumatic shut-off valve. the

When working, high-pressure natural gas is sent into the high-pressure gas inlet pipe 13. At this time, because the gas pressure is too high, it cannot be directly used for the cut-off valve and pressure regulator. Therefore, the high-pressure natural gas pressure needs to be reduced to the applicable pressure. The pressure gauge 10 is used to monitor whether the pressure after pressure regulation is correct. After pressure regulation, the low-pressure natural gas enters the gas buffer distribution tank 6, and then connects the pressure regulating valve air supply pipe through the internal thread ball valve 11, and the internal thread ball valve 12 connects the pneumatic shut-off valve air supply pipe to supply gas for the pressure regulating valve and the pneumatic shut-off valve. Since the entire gas equipment will run under the monitoring of the electric control equipment, if a power failure occurs, the electric control equipment will not be able to complete the monitoring, which will cause the system to be in danger, so when the power failure occurs, the electric control equipment will control the solenoid valve 15 to close , the pneumatic shut-off valve cannot get air supply, the pneumatic shut-off valve is closed, and the system stops, thus protecting the safety of the entire system. the

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model. the

Claims (3)

1. A self-supply system for the control of a compressed natural gas pressure regulating device, comprising a pneumatic shut-off valve and a pressure regulating valve connected in series in a high-pressure inlet pipe, characterized in that, the inlet of the high-pressure inlet pipe is provided with a gas distributor, The gas distributor is connected to the pneumatic shut-off valve through the gas supply pipe of the pneumatic shut-off valve, and the gas distributor is connected to the pressure regulating valve through the gas supply pipe of the pressure regulating valve. 2. A self-supply system for compressed natural gas pressure regulating device control according to claim 1, characterized in that the gas distributor is a gas buffer distribution tank connected by a high and medium pressure regulator. 3. A self-supply system for controlling a compressed natural gas pressure regulating device according to claim 1 or 2, characterized in that a solenoid valve is provided on the gas supply pipe of the pneumatic shut-off valve.