CN215262273U

CN215262273U - Automatic atmospheric pressure test device of LNG gas cylinder

Info

Publication number: CN215262273U
Application number: CN202121103191.6U
Authority: CN
Inventors: 林瑞进; 章宇庆; 黄金雷; 张光刘
Original assignee: China United Engineering Corp Ltd
Current assignee: China United Engineering Corp Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-12-21
Anticipated expiration: 2031-05-21

Abstract

The utility model provides an automatic atmospheric pressure test device of LNG gas cylinder, the measuring accuracy is high, low in labor strength, and experimental data also can be preserved in addition. The utility model comprises a first pressure gauge, a second pressure gauge, a third pressure gauge, a pressure regulating valve group, a pneumatic valve, a proportional regulating valve group, an emptying valve, a silencer, a pressure sensor, a high-pressure hose, a main pipeline and a branch pipeline; the outlet of the branch pipeline is connected with the LNG cylinder through a high-pressure hose, and the inlet of the branch pipeline is connected with the outlet of the main pipeline; the pneumatic valve, the proportional control valve group, the blow-off valve, the third pressure gauge and the pressure sensor are sequentially arranged on the branch pipeline, and the silencer is arranged on the blow-off valve; a manometer, pressure regulating valves, No. two manometers install in proper order on the trunk line.

Description

Automatic atmospheric pressure test device of LNG gas cylinder

Technical Field

The utility model relates to an automatic atmospheric pressure test device of LNG gas cylinder.

Background

Cryogenic insulation gas cylinders (hereinafter referred to as "LNG gas cylinders") are a key part of the gas supply fuel system of LNG vehicles as pressure vessels for storage and transportation of LNG, and have attracted much attention. With the gradual enhancement of energy-saving and environment-friendly awareness of people, the release of the motor vehicle pollutant emission standard in the sixth stage of China and the rapid development of the liquefied natural gas automobile industry, the LNG gas cylinder serving as a vehicle-mounted gas supply module can also meet wide development prospects. The LNG gas cylinder has strict quality control requirements in the production process as a pressure container, each welding line needs to be subjected to leak detection testing after welding is completed, and at present, the method mainly adopts manpower to flush high-pressure gas into a gas cylinder liner and maintain the pressure for a certain time to perform pressure testing. The uncertainty exists in the manual control air intake speed and air intake pressure, leads to the measuring accuracy not high and intensity of labour is high, and experimental data also can not be preserved in addition, is not convenient for tracing back of product quality. How to solve the above problems is urgent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide an automatic atmospheric pressure test device of LNG gas cylinder that structural design is reasonable, and measurement accuracy is high, low in labor strength, and experimental data also can be preserved in addition.

The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides an automatic atmospheric pressure test device of LNG gas cylinder which characterized in that: the system comprises a first pressure gauge, a second pressure gauge, a third pressure gauge, a pressure regulating valve group, a pneumatic valve, a proportion regulating valve group, an emptying valve, a silencer, a pressure sensor, a high-pressure hose, a main pipeline and a branch pipeline; the outlet of the branch pipeline is connected with the LNG cylinder through a high-pressure hose, and the inlet of the branch pipeline is connected with the outlet of the main pipeline; the pneumatic valve, the proportional control valve group, the blow-off valve, the third pressure gauge and the pressure sensor are sequentially arranged on the branch pipeline, and the silencer is arranged on the blow-off valve; a manometer, pressure regulating valves, No. two manometers install in proper order on the trunk line.

The branch pipeline be many, a branch pipeline connects a set of gas cylinder, the import of these branch pipelines collect the back and the exit linkage of trunk line.

No. three manometer be two, set up side by side.

Compared with the prior art, the utility model, have following advantage and effect: the test device is simple to operate, high in efficiency, high in automation degree, time-saving, labor-saving, safe, stable, high in test precision and low in labor intensity, test data can be stored, and meanwhile, multiple groups of configuration can be carried out according to production requirements, and the test device is flexible to use.

Drawings

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

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

The embodiment of the utility model provides an include manometer 1a, No. two manometer 1b, No. three manometer 1c, pressure regulating valves 2, pneumatic valve 3, proportional control valves 4, atmospheric valve 5, silencer 6, pressure sensor 7, high-pressure hose 8, trunk line 9 and small transfer line 10.

The outlet of the branch pipeline 10 is connected with the LNG gas cylinder 11 through the high-pressure hose 8, the inlet is connected with the outlet of the main pipeline 9, and the inlet of the main pipeline 9 is used for air intake. LNG gas cylinder 11 is the multiunit, and branch pipe 10 is many like this, and a branch pipe 10 connects a set of gas cylinder 11, and the import of these branch pipe 10 collects the back and the exit linkage of trunk line 9, so can realize the pressure test of multiunit work piece.

The pneumatic valve 3, the proportional control valve group 4, the blow-down valve 5, the third pressure gauge 1c and the pressure sensor 7 are sequentially arranged on the branch pipeline 10. A muffler 6 is mounted on the blow valve 5. The number 1c of the third pressure gauge is two and is arranged side by side.

A pressure gauge 1a, a pressure regulating valve group 2 and a pressure gauge 1b are sequentially arranged on a main pipeline 9.

The pressure regulating valve group 2 is used for regulating the air inlet pressure before the stability test. Pressure gauge 1a is used to display the inlet pressure. And the second pressure gauge 1b is used for displaying the test pressure after the pressure stabilization. The pneumatic valve 3 serves as a switch for controlling the pressure test of the gas cylinder. The vent valve 5 and the silencer 6 are used in pairs for discharging gas in the workpiece after pressure test is finished, and noise of the discharged gas is reduced. The pressure sensor 7 is installed at the front end of the air inlet of the air bottle and used for recording test pressure in real time, storing test data in real time, and displaying the test data on the control panel in real time through the control system to generate a test data curve. The third pressure gauge 1c is used for checking the accuracy of the test data irregularly. The high-pressure hose 8 is used for connecting the branch pipeline 10 and the LNG gas cylinder 11 to assist in a workpiece pressure test.

The utility model discloses an operation engineering as follows:

1. before use, all the instruments are confirmed to be qualified and used within the valid period.

2. The high pressure hose 8 is first connected to the LNG cylinder 11 and checked for tightening in place.

3. After the test pressure of the first pressure gauge 1a is checked and confirmed to meet the test requirements, the pressure regulating valve group 2 is slowly opened, and after the second pressure gauge 1b slowly rises to the specified pressure and is stable, the pressure regulating valve group 2 automatically stops pressure regulation.

4. And opening the pneumatic valve 3, closing the emptying valve 5, simultaneously adjusting the air inflow by the proportional control valve group 4 according to the set proportion, and hearing the pipeline air flow to enter the LNG gas cylinder 11 at the moment.

5. The pressure sensor 7 monitors the internal pressure of the gas cylinder in real time, and the pneumatic valve 3 is closed after the pressure sensor 7 reaches the specified pressure of the system. A worker detects the position to be detected of the gas injection cylinder by adopting the Snaop leakage detection liquid and simultaneously observes whether the gas cylinder has bubbles or not; if no leakage point is found, the pneumatic valve 3 is continuously opened, and the test is continued.

6. When the pressure sensor 7 detects that the air pressure reaches the test pressure, the pneumatic valve 3 is closed, and the LNG cylinder 11 enters a pressure maintaining stage; the pressure maintaining time is determined according to the technological requirements of products, and the pressure maintaining time of the LNG gas cylinder 11 is 30 seconds.

7. And opening the vent valve 5 and the silencer 6 after the pressure maintaining time is over, slowly releasing the pressure in the gas cylinder until the pressure sensor 7 shows 0, and ending the gas pressure test of the gas cylinder.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides an automatic atmospheric pressure test device of LNG gas cylinder which characterized in that: the system comprises a first pressure gauge, a second pressure gauge, a third pressure gauge, a pressure regulating valve group, a pneumatic valve, a proportion regulating valve group, an emptying valve, a silencer, a pressure sensor, a high-pressure hose, a main pipeline and a branch pipeline; the outlet of the branch pipeline is connected with the LNG cylinder through a high-pressure hose, and the inlet of the branch pipeline is connected with the outlet of the main pipeline; the pneumatic valve, the proportional control valve group, the blow-off valve, the third pressure gauge and the pressure sensor are sequentially arranged on the branch pipeline, and the silencer is arranged on the blow-off valve; a manometer, pressure regulating valves, No. two manometers install in proper order on the trunk line.

2. The automatic gas pressure test device of LNG gas cylinder of claim 1, characterized in that: the branch pipelines are multiple, one branch pipeline is connected with a group of gas cylinders, and inlets of the branch pipelines are connected with an outlet of the main pipeline after being converged.

3. The automatic gas pressure test device of LNG gas cylinder of claim 1, characterized in that: the number three is two, set up side by side.