SU941051A1 - Apparatus for controlling pressure of cutting oxygen - Google Patents

Description

The external solenoid valve connecting the receiver to the atmosphere is equipped with a purge reducer for the gas supply line, the high pressure chamber of which is connected to the low pressure chamber of the starting gearbox, and an additional solenoid valve connected to the low pressure chamber of the purge reducer and connecting the purge reducer with the gas supply manifold device behind the receiver in the course of supplying oxygen cutting.

The proposed device is shown in the drawing.

The device consists of a pneumatic-controlled gearbox 1, the high-pressure chamber of which is connected to the gas supply line 2. The high-pressure joint of the high-pressure gear of the starting gearbox 3, the low-pressure chamber of which is connected through a normally closed electromagnetic claian 4, an adjustable throttle 5, which is represented It is a valve with the main adjustment, and the receiver 6 with the chamfer chamber of the gearbox 1. The receiver 6 communicates with the atmosphere through a waste normally open electromagnetic valve 7.

The device also contains a purge reducer 8, the high pressure chamber of which is connected to the low pressure chamber of the starting reducer 3. The low pressure chamber of the reducer 8 is connected via a normally closed solenoid valve 9 to the submembrane chamber of the reducer 1.

The device works as follows.

Gear 3 sets the required working pressure of the cutting oxygen, gear 8 sets the required etching pressure (Rzoot 0.2-0.3 kgf / cm), throttle 5 sets the rise time of the cutting oxygen. Then, simultaneously with the start-up of the combustible gas, the valve 9 opens and the valve 7 closes. Oxygen under pressure P "comes into the receiver 6 and the submembrane chamber of the reducer 1. The reducer 1 opens, the cutting oxygen is etched, i.e., the line is continuously purged relays oxygen, which prevents the oxygen-oxygen mixture from entering the specified main.

When the metal is heated up, the valve 4 opens - a gradual increase in pressure occurs in the receiver 6 from the pickling pressure to the predetermined working pressure, and consequently, in the low pressure chamber of the reducer 1.

As the pressure in receiver 6 increases, the pressure in the low pressure chamber of pressure reducer 8 increases, and it closes.

For a low cutoff of the oxygen supply valve, the valve 4 is closed, and the valve 7 is opened, i.e. the pressure in the receiver and the submembrane chamber sharply press, and the gearbox 1 closes. Valve 9 remains open. The oxygen supplied through the reducer 8 is partially bled through the valve 7. In the future, two modes of operation are possible: simultaneously with oxygen, the supply of the gas-oxygen heating mixture is turned off; after disconnecting the oxygen supply, the gas-oxygen mixture (heating the flame) continues to burn and purging of the oxygen supply supply (etching) takes place.

To ensure the above work, after closing the valve 4, the valve 7 is opened for a sharp cut-off of the relium oxygen zone strictly strictly fixed

time /, required for bleeding, pressure from receiver 6 and closing gearbox 1. If during this time / oxygen-gas mixture (heating flame) does not turn off, valve 7 again

the Rel: Blowout line will be purged and buried while the heating flame burns. After turning off the warming flame, valve 9 will close and valve 7 will open.

The proposed device will eliminate backfire on the line of cutting oxygen, improve the operation of the gas supply system of the machine as a whole, as well as improve the safety conditions.

Claims (2)

1. Asinovska G. A. and others. GazoplazmenM .., “Higher on metal processing, school, 1975, p. 84-85. 2. USSR author's certificate 5 No. 545432, cl. At 23 K 7/10, 07.07.75 (prototype). yf t4