SU1532771A1 - Gas-charging unit - Google Patents

Abstract

The invention relates to gas engineering and is intended to fill tanks with pressurized gas, for example, to charge pneumo-hydraulic batteries with nitrogen. The purpose of the invention is to increase the charge pressure while simplifying the design and maintenance of the installation. The gas charge unit contains a source of working and displacing gases, respectively, with a non-return valve and a pneumatic valve, a working gas metering unit connected to them, a sensor with a pressure setting device connected to the vessel, as well as a second non-return valve. The dispenser is made in the form of a pneumatic multiplier with a stepped piston forming a cavity of low and high pressure and a rod cavity, a second check valve is installed between the high pressure cavity of the pneumatic multiplier and the vessel, and the pneumatic valve is equipped with electric actuators and limit switches that interact with the piston of the pneumatic multiplier. In one version, the pneumatic multi-piston piston is provided with a return spring, in the other, the piston rod of the pneumatic multi-multiplier is connected by means of a pneumatic valve with a source of pressure gas. Check valves are built into the pneumatic high pressure valve body. The pneumatic multiplicator of the installation works as an amplifier: the charging pressure of the working gas is equal to the product of the pressure of the working gas by the degree of multiplication / ratio of stepped piston areas, 3 hp f-ly, 2 ill.

Description

The invention relates to gas engineering and is intended to fill tanks with compressed gas, especially at medium and high pressures, for example, to charge pneumohydraulic accumulators with nitrogen.

The purpose of the invention is to increase the charge pressure while simplifying the design and maintenance of the installation.

FIG. Figures 1 and 2 respectively show the gas jet installation diagrams with the spring and pneumatic return of the multiplier piston.

The installation contains a working gas metering unit in the form of a pneumatic multiplier 1 with a stepped piston 2, forming low cavities 3 and high 4 pressures and a rod cavity 5. The piston is equipped with a return spring 6 and a movable stop 7 interacting with limit switches 8 and 9. The pneumatic multiplicator is connected via a pipeline 10 and throttles 11 with an electropneumatic valve 12. A source of propellant gas (not shown) is connected to an electropneumatic valve by pipeline 13. A high pressure cavity 4 is via a non-return valve 14, pipe 15 and a valve s 16 is coupled with the vessel 17 and through a check valve 18 and line 19 - with a source of working gas (not shown). With the vessel, the sensor 20 with a pressure setpoint is attached.

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with

N3 1

The check valves are built into the high-pressure cavity housing of the pneumatic multi-pump.

| The sizes of chokes, pipelines and electropneumatic valves depend on the performance of the installation. In this case, throttles 08-I and pneumatic valve G1R31 1202K-PO are used for spring return of the piston, as well as pneumatic valve PR241222-BUT for returning the piston by the displacing gas, additionally connected to the piston rod of the pneumatic multiplier.

Specific dimensions of the pneumatic multiplier are chosen depending on the pressure in the charging vessel, and the lower the pressure in the source of the working gas, the greater should be the ratio of the areas of the stepped piston of the pneumatic multiplicators, that is, its degree of multiplication.

 For example, with the pressure of the working gas 5, the pressure of the displacing gas (compressed air of the plant network) is also 5J, and if the piston diameters are 25 and 180 mm, the area ratio 50) the pressure in 1 charged vessel will be these.

I By choosing the stroke and frequency of operation of the pneumatic multiplier, optimum performance is achieved with no heating of the working gas. For example, with a stroke of 50 mm and a response frequency of 1 G, and the output will be 1.5 liters / min.

The gazozar dka unit works in the following way.

In the initial position, the required pressure is established on the sensor with pressure sensor, a source of working gas is connected to the pipeline 19, for example a nitrogen cylinder, to the pipeline 13 - a source of propellant gas, for example compressed air from the factory line, and to a ventilated vessel, for example, a pneumohydraulic battery. The electric pneumatic valve is in the “Closed” position, and the pneumatic multi-piston piston is in the extreme left position. Nitrogen and & cylinder - source of working gas through the check valve and the valve enters the vessel. Automatic operation of the pneumatic multiplier starts, i.e., the electric valve switches to the "Open and compressed air" position, the passage through the electric pneumatic valve and the throttle enters the low pressure cavity of the pneumatic multiplier. In this case, the piston, moving to the extreme right position, compresses the nitrogen in the high pressure cavity and through the non-return valve and the valve supplies it to the vessel.

A fixed stop rigidly connected to the piston, acting on the limit switch 9, switches the electropneumatic valve to its initial position, the supply of compressed air is stopped, and the spring returns

20

25

five

15

35, 5 0

thirty

five

Shen to its original position A low pressure is formed in the high-pressure cavity, as a result of which a portion of nitrogen enters. Meanwhile, the movable stop, acting on the limit switch 8, switches the electropneumatic valve to the open position and the cycle repeats. When a predetermined pressure is reached in the vessel, the sensor with the pressure setpoint switches off the electropneumatic valve and the charging stops.

In the case of a spring return of the pneumatic-piston piston, a 3-way electropneumatic valve with a single electromagnet is sufficient, since here it is only necessary to periodically turn on the supply of propellant gas through the only exhaust pipe. The rod cavity of the pneumatic multiplier here is always open to the atmosphere.

In the case of a piston pneumatic return, when cutting off the supply of displacing gas into the low pressure cavity of the pneumatic multiplier, it is necessary to simultaneously feed this gas into the rod cavity. For this, a 4-way electropneumatic valve with electromagnets B is used when cutting off the supply of the displacing gas into the cam or the electric valve connects the cavity with the atmosphere

Thus, the proposed installation creates a high pressure in the vessel when using low pressure sources of both working and propellant gases, and also allows simplifying the design and automating the charging process. The installation does not require a cooling system and is safe.

Claims (4)

Invention Formula . A gas supply unit, containing sources of working and displacing gases, respectively, with a check valve and a pneumatic valve, a working gas metering device connected to the vessel, a sensor with a pressure setting device, and a second check valve that differs in that. In order to increase the charge pressure while simplifying the design and maintenance of the installation, the dispenser is designed as a pneumatic multiplier with a stepped piston forming low and high pressure cavities and a rod cavity, the second non-return valve is installed between the high pressure pneumatic multiplicator cavity and the vessel, and the pneumatic valve is electrically operated and limit switches interacting with pneumatic multi-piston piston 2 Installation according to claim 1, characterized in that the piston of the pneumatic multiplier is provided with a return spring 3. Installation according to claim 1, characterized in that the shaft of the pneumatic multiplexer cavity is connected by means of a pneumatic valve to a source of propellant gas. 4. Installation under item I, characterized in that the check valves are embedded in the body of the high-pressure cavity of the pneumatic multiplier. w - T-; eleven 1