SU1661546A1 - Device for adjustment of fuel supply to combustion chamber - Google Patents

Abstract

This invention relates to automatic regulation and improves the reliability of the device. At the design flow rate of the cooler, under the action of the pressure difference at the inlet and in the critical section of the Venturi tube 19, the diaphragm 16 of the pressure relay 15 deflects. The pressure relay plug 15 moves with the diaphragm 16, and the valve flap 12 covers the nozzle. As the pressure of compressed air increases in pneumatic capacity 13, the control pressure in cavity 8 of fuel valve 5 rises. Fuel valve 5 opens and fuel enters the combustion chamber. In case of a decrease in the flow rate of the cooler, the drain valve 12 opens, the pressure in the controlled cavity 8 decreases, and the fuel valve 5 closes. The fuel does not enter the combustion chamber, protecting it from destruction if there is insufficient cooling. 1 il.

Description

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The invention relates to the field of automatic regulation, in particular, to devices for regulating the supply of fuel to a cooled combustion chamber of a thermal aperture and a heat generator of pressurization and heating of oil wells.

The aim of the invention is to increase the reliability of the device.

The drawing shows a schematic diagram of the proposed device for regulating the supply of fuel.

The device contains a coolant supply line 1, for example, water, in which a shut-off valve 2 is installed, controlled by the pressure of the pneumatic line 3, the fuel supply line 4 with the fuel valve 5, having a piston 7 spring-loaded 6 by the spring 5. The control cavity 8 of the valve 5 is connected by a line 9 compressed air with a constant pressure source, and the spring cavity 10 of this valve - with a low pressure cavity, such as the atmosphere, and a pipe 11 with a nozzle of a drainage valve 12, a nozzle-valve installed in the pneumatic network 13, connected a line 14 with a controlled cavity 8. A drain valve flap 12 is connected to a stem of a pressure relay 15 having a membrane 16 rigidly connected to the stem, a membrane cavity 17 connected by a highway 18 to the inlet of the Venturi tube 19 installed in line 1, and rod cavity 20 connected by line 21 to the critical section of tube 19, with pressure relay 15 and pneumatic capacity 13 having a common body 22.

The device works as follows.

At the command of activation, a control pressure of compressed air is supplied in lines 3 and 9. The shut-off valve 2 opens and the coolant enters through line 1 into the combustion chamber. The fuel valve 5 does not open at this, since the pressure in the controlled cavity 8 of this valve is not enough to overcome the force of the spring 6 and move the piston 7 due to the bypass of compressed air through line 14 through the valve 12 nozzle-damper and spring cavity 10 to the low pressure cavity for example the atmosphere

In case the line 1 or the cooling path of the combustion chamber is not flowing, the pressure at the entrance of the Venturi tube 19 is the same as in its critical section. This pressure flows through line 18 into the membrane cavity 17 and through line 21 into the rod cavity 20 of pressure relay 15. The pressure switch 15 does not operate due to a slight difference in the working areas of the membrane 16 that are affected by this pressure. The drain valve 12 remains open, and the pressure in the controlled cavity 8 of the valve 5 is not enough to open it, therefore, the fuel does not flow into the combustion chamber, i.e. eliminating its operation in off-design mode (without cooler).

At the design flow rate of the cooler in the combustion chamber under the action of the pressure difference at the inlet and in the critical section of the Venturi tube 19 (due to the difference in flow rates) the diaphragm 16 of the pressure relay 15 deflects. The pressure relay plug 15 moves with the diaphragm 16, and the valve flap 12 covers the nozzle. As the pressure of compressed air in pneumatic capacity 13 increases, the control pressure in cavity 8 of fuel valve 5 increases. After a time calculated to restore the steady flow regime of the cooler in line 1 and the cooling path of the combustion chamber, the pressure in pneumatic capacity 13 and controlled cavity 8 reaches the calculated value value and fuel valve 5 opens. The fuel enters the combustion chamber.

In case of a decrease in the flow rate of the cooler, the drain valve 12 opens, the pressure in the controlled cavity 8 decreases, and the fuel valve 5 closes. Fuel does not enter the combustion chamber, protecting it from destruction if it is not sufficiently cooled.

To stop the operation of the combustion chamber, the shutdown pressure source is disconnected from compressed air from lines 3 and 9 by shutting down the command. The shut-off valve 2 closes, the flow rate of the cooler through the Venturi tube 19 stops, and the pressure switch 15 triggers to open the drain valve 12. Compressed air from cavity 8 through line 9 and 14, through the drain valve 12 enters the spring cavity 10 of the fuel valve. Under the action of the force of the spring 6, the fuel valve 5 is closed and the fuel supply to the combustion chamber is stopped.

Claims (1)

Invention Formula A device for regulating the supply of fuel to the combustion chamber, comprising a fuel valve installed in the fuel supply line and connected to the fur: a low regulation of fuel supply connected to the coolant supply line, and a low pressure cavity, characterized in that the device further comprises a control line compressed 5 16615466 air, the fuel valve has controllable, respectively, with the inlet and with the em and spring cavities, connected with the critical section of the venturi. Responsibly with the compressed air tank connected to the air trunk and with a low pressure cavity, a compressed air chamber, a drainage valve - a mechanism for adjusting the fuel supply you - 5 to the Nozzle gate, located in the full in the form of a Venturi tube, a pneumatic capacitance, and a relay rod the pressure installed in the supply line is cooled-connected with the valve of this valve, and the nozzle of the bodies, the membrane pressure switch is connected to the spring cavity of the fuel, membrane and rod cavities of the valve.