CN216383586U - A gas filling system - Google Patents

Abstract

The utility model relates to a gas filling system, comprising a cryogenic liquid storage tank, an expansion tank, a buffer tank and several high-pressure gas cylinders which are connected in sequence through pipelines. A metering device for controlling the flow rate of the liquid is connected between the storage tank and the expansion tank. The beneficial effect of the utility model is: the endothermic gasification of the liquid gas in the expansion tank at normal temperature, and the method of increasing the pressure to obtain high-pressure gas , so that high-pressure gas can be obtained without power input, the production cost is reduced, and the system structure is simplified. ; At the same time, no compression equipment is connected, which effectively avoids the entry of impurities, noise pollution, reduces power consumption, and greatly improves the purity of the gas.

Description

A gas filling system

technical field

The utility model relates to the technical field of gas filling equipment, in particular to a gas filling system.

Background technique

At present, a large amount of oxygen, nitrogen, argon and other industrial gases are used in industrial production, and most of them are filled with high-pressure gas cylinders, and the current filling method is: liquid gas - vaporization - compressor compression - Refill. There are some defects in this filling method: the compressor needs frequent maintenance, impurities may be introduced during the compressor compression process, the power consumption is large, the installation site requirements are high, and the noise is high.

Utility model content

The technical problem to be solved by the present invention is to provide a gas filling system to overcome the above-mentioned deficiencies in the prior art.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a gas filling system, comprising a cryogenic liquid storage tank, an expansion tank, a buffer tank and several high-pressure gas cylinders connected in sequence through pipelines, and the expansion tank is used to make the liquefied gas For expansion and gasification, a metering device for controlling the flow of liquid is connected between the cryogenic liquid storage tank and the expansion tank.

The beneficial effect of the utility model is that high-pressure gas can be obtained by means of endothermic gasification of liquid gas at room temperature in the expansion tank, and the pressure is increased, so that high-pressure gas can be obtained without power input, and the production cost is reduced. The system structure is simplified, and the quality of the liquid gas entering the filling system is controlled by the metering device, so as to control the pressure of the gas finally filled into the high-pressure gas cylinder; at the same time, there is no access to the compression equipment, which effectively avoids the entry of impurities and noise pollution , reducing power consumption and greatly improving the purity of the gas.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the structure of the copper sheet of the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1. Cryogenic liquid storage tank, 2. Expansion tank, 3. Buffer tank, 4. High pressure gas cylinder, 5. Measuring device, 51. Mass flow meter, 52. Weighing tank, 53. Liquid inlet valve, 54. Liquid outlet Valve, 55, equalizing valve, 56, venting valve, 21, copper sheet, 22, through hole, 6, safety valve, 7, venting valve.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings, and the examples are only used to explain the present invention, and are not intended to limit the scope of the present invention.

Embodiment 1, as shown in Figures 1 to 2, a gas filling system includes a cryogenic liquid storage tank 1, an expansion tank 2, a buffer tank 3, and several high-pressure gas cylinders 4, which are sequentially connected through pipelines. The expansion tank 2 In order to expand and gasify the liquefied gas, a metering device 5 for controlling the flow of liquid is connected between the cryogenic liquid storage tank 1 and the expansion tank 2, the high-pressure gas cylinder 4 is connected to the system, and the connection between the high-pressure gas cylinder 4 and the system is opened. The valve makes the liquid gas enter the metering device 5 from the cryogenic liquid storage tank 1, and the mass of the flowing liquid gas is measured by the metering device 5. When the liquid gas entering the metering device 5 reaches the preset value, the liquid gas enters the expansion tank 2. Medium expansion and pressurization gasification, the gas after expansion and pressurization will be buffered in the buffer tank 3 to reduce the pressure fluctuation during the filling process. At the same time, after one filling is completed, the buffer tank 3 will store a certain amount of gas. The high-pressure gas cylinder 4 is pre-filled at the next filling.

Embodiment 2, as shown in FIGS. 1 to 2 , this embodiment is a further improvement based on Embodiment 1, and the details are as follows:

The metering device 5 includes a mass flow meter 51 and a weighing tank 52 connected in sequence, the expansion tank 2 is connected under the weighing tank 52 through a pipeline, and the mass flow meter 51 is convenient for detecting the quality of the passing liquid gas, and at the same time according to the preset flow value. Control the inflow of liquid gas.

Embodiment 3, as shown in Figures 1 to 2, this embodiment is a further improvement on the basis of Embodiment 2, and the details are as follows:

A liquid inlet valve 53 is provided between the mass flow meter 51 and the weighing tank 52; a liquid outlet valve 54 is provided between the weighing tank 52 and the expansion tank 2, and the mass flow meter 51 is electrically connected to the liquid inlet valve 53. When the weight of the liquid gas in the measuring tank 52 reaches the preset value, a signal to close the valve is provided to the liquid inlet valve 53, and then the liquid outlet valve 54 is opened to allow the liquid gas to enter the expansion tank 2 for expansion and gasification.

Embodiment 4, as shown in FIGS. 1 to 2 , this embodiment is a further improvement on the basis of Embodiment 3, and the details are as follows:

Between the weighing tank 52 and the expansion tank 2, a pressure equalizing valve 55 arranged in parallel with the liquid outlet valve 54 is provided. The air pressure between the measuring tanks 52 is the same, so that the liquid gas in the weighing tank 52 can flow into the expansion tank 2 more quickly.

Embodiment 5, as shown in Figures 1 to 2, this embodiment is a further improvement on the basis of Embodiment 2, and the details are as follows:

The weighing tank 52 is provided with a venting valve 56, and the venting valve 56 can reduce the pressure in the weighing tank 52 when the liquid gas enters the weighing tank 52, so that the cryogenic liquid storage tank 1 and the weighing tank 52 maintain a certain pressure difference, It is convenient for the liquid gas to enter the weighing tank 52 under the action of pressure.

Embodiment 6, as shown in Figures 1 to 2, this embodiment is a further improvement on the basis of Embodiment 3, and the details are as follows:

The liquid inlet valve 53 is a pneumatic shut-off valve, which can be driven by compressed air or nitrogen, and has two states of “on” and “off”, which can close and open the liquid inlet valve 53 more quickly and safely.

Embodiment 7, as shown in FIGS. 1 to 2 , this embodiment is a further improvement on the basis of Embodiment 1, and the details are as follows:

The expansion tank 2 is provided with a helical copper sheet 21, and the copper sheet is provided with a number of through holes 22. The helical copper sheet 21 can effectively accelerate the heat exchange between the liquid gas in the expansion tank 2 and the environment. The through holes 22 are more convenient for the vaporized gas to pass through.

Embodiment 8, as shown in FIGS. 1 to 2 , this embodiment is a further improvement on the basis of Embodiment 1, and the details are as follows:

There is a safety valve 6 at the end of the gas flow direction of the pipeline. During the working process of the system, if the pressure exceeds the preset safety pressure, the safety valve 6 will automatically jump to release the pressure to ensure the safety of the system.

Embodiment 9, as shown in FIGS. 1 to 2 , this embodiment is a further improvement based on Embodiment 1, and the details are as follows:

A vent valve 7 is provided at the end of the gas flow direction of the pipeline. When the equipment pipeline system needs to be purged, the vent valve 7 can be opened for purging and replacement.

The concrete workflow of the present utility model is:

1. Connect the high-pressure gas cylinder 4 to the system, and open the valve between the high-pressure gas cylinder 4 and the system.

2. The liquid outlet valve 54 and the pressure equalizing valve 55 are in the closed state, the release valve 56 is in the open state, and the liquid inlet valve 53 is opened, so that the liquid gas enters the weighing tank 52 from the cryogenic liquid storage tank 1, and flows through the mass flow meter 51. The mass of the liquid gas is measured, and when the liquid gas entering the weighing tank 52 reaches the preset value, the liquid inlet valve 53 and the discharge valve 56 are closed.

3. Open the pressure equalizing valve 55 to make the pressure of the weighing tank 52 and the expansion tank 2 consistent, and then open the liquid outlet valve 54, so that the liquid gas flows into the expansion tank 2 from the weighing tank 52 under the action of gravity, and the liquid gas flows into the expansion tank 2. 2 endothermic vaporization into a gaseous state and then enter the buffer tank 3 and the high-pressure gas cylinder 4.

4. After all the liquid gases are vaporized, when the gas pressure in the high-pressure gas cylinder 4 reaches the filling pressure value, close the valve between the high-pressure gas cylinder 4 and the system, and disconnect the high-pressure gas cylinder 4 from the system.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (9)

1. A gas filling system, characterized in that it comprises a cryogenic liquid storage tank (1), an expansion tank (2), a buffer tank (3) and several high-pressure gas cylinders (4) connected in turn by pipelines, the The expansion tank (2) is used to expand and gasify the liquefied gas, and a metering device (5) for controlling the flow rate of the liquid is connected between the cryogenic liquid storage tank (1) and the expansion tank (2). 2. A gas filling system according to claim 1, characterized in that, the metering device (5) comprises a mass flow meter (51) and a weighing tank (52) connected in sequence, and the expansion tank ( 2) Connected to the bottom of the weighing tank (52) through a pipeline. 3. A gas filling system according to claim 2, characterized in that a liquid inlet valve (53) is provided between the mass flow meter (51) and the weighing tank (52); the weighing A liquid outlet valve (54) is arranged between the tank (52) and the expansion tank (2), and the mass flow meter (51) is electrically connected to the liquid inlet valve (53). 4. A gas filling system according to claim 3, characterized in that, a pressure equalizer arranged in parallel with a liquid outlet valve (54) is provided between the weighing tank (52) and the expansion tank (2) valve (55). 5. A gas filling system according to claim 2, characterized in that, a release valve (56) is provided on the weighing tank (52). 6 . The gas filling system according to claim 3 , wherein the liquid inlet valve ( 53 ) is a pneumatic shut-off valve. 7 . 7 . The gas filling system according to claim 1 , wherein a spiral copper sheet ( 21 ) is provided in the expansion tank ( 2 ), and a plurality of through holes ( 22 ) are provided on the copper sheet. 8 . . 8. A gas filling system according to claim 1, characterized in that, a safety valve (6) is provided at the end of the gas flow direction of the pipeline. 9 . The gas filling system according to claim 1 , wherein a vent valve ( 7 ) is provided at the end of the gas flow direction of the pipeline. 10 .

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