SU1652688A1 - Method and device for removing gas from hydraulic system - Google Patents

Abstract

The invention relates to mechanical hydraulic drive and can be used in the maintenance of aircraft hydraulic systems. The purpose of the invention is to increase the reliability of the system. Before pumping the fluid through the pressure source 4 after a long interruption in the operation of the hydraulic system, the volume of fluid is directed from the suction pipe 3 into the closed chamber 20 of the variable volume of the multiplier 5. For this, the gas accumulator 2 is connected to the gas cavity 12 of the tank 1. Under the action of the pressure difference in the gas the cavity 12 and the atmospheric pressure in the interpiston cavity 22 of the multiplier 5, the liquid from the tank 1 displaces the liquid with a gas stopper from the pipeline 3 into the closed chamber 20 of a variable volume multiplier 5 from which it is directed to a degasser 6. where the undissolved gas and the liquid containing it are separated. The gas is vented to the atmosphere, and the liquid to the tank 1. 2 C, ff, 1 sludge. fe

Description

The invention relates to a mechanical hydraulic actuator and can be used in the maintenance of hydraulic systems of aircraft.

The purpose of the invention is to increase the reliability of the system.

The drawing shows a diagram of a hydraulic system that implements the proposed method of gas removal from the working fluid.

A device for implementing the proposed method of gas removal from the hydraulic system contains a tank 1 with a liquid, a gas accumulator 2, a suction pipe 3, a pressure source 4, a multiplier 5, a degasser 6, check valves 7-10, a drain hydraulic line 11 and hydraulic devices of the hydraulic system (not shown in the drawing shown), the gas accumulator 2 is connected to the gas cavity 12 of the tank 1 through a check valve 7 and the bleed valve 13. The liquid cavity 14 of the tank 1 is connected to the outlet of the drain line 11 and to the inlet of the suction pipe 3. The outlet of the suction pipe piping 3 is connected to the input of the pressure source 4 and through the return valve? pan 8 with the inlet of the degasser 6 installed in the drain line 11. The drain line 11 at the inlet and outlet of the degasser 6 is equipped with check valves 9 and 10. The multiplier is made with pistons 15 and 16. The small piston 16 is not connected to the rod 17 of the large piston 15 and is preloaded return spring 18 to the side of the high-pressure chamber T9, the closed chamber 20 of variable volume of the multiplier 5 is connected to the inlet of the degasser 6, the high-pressure chamber 19 through an adjustable throttle 21 with the output of the pressure source 4, and the piston cavity 22 with the atmosphere.

A device for removing gas from the hydraulic system operates as follows.

Before pumping the liquid by the pressure source 4 after a long break in the hydraulic system, a liquid volume equal to the internal 45 volume of the suction pipe 3 is directed from the suction pipe 3 to the closed chamber 20 of the variable volume of the multiplier 5. For this, the bleed valve 13 is set to position 50 wherein the gas accumulator 2 through the check valve 7 is connected to the gas cavity 12 of the tank 1. Under the influence of the pressure difference in the gas cavity 12 of the tank 1 and atmospheric pressure in the inter-piston 55 cavity 22 of the multiplier 5, the liquid from the tank 1 displaces the liquid with the gas plug from the suction pipe 3 through the check valve 8 into the closed chamber 20 of a variable volume of the multiplier 5.

Thanks to check valves 8-10, a different direction of fluid movement is eliminated.

Then the liquid with the gas plug from the closed chamber 20 of the variable volume of the multiplier 5 is sent to the degasser

6. To do this, include a source of 4 pressure. The fluid from the pressure source 4 enters the high-pressure chamber 19 through an adjustable throttle 21. Under pressure in the chamber 19, the small piston 16 moves, compresses the return spring 18 and then acts on the rod 17 of the large piston 15, displacing the liquid from the closed chamber 20 of variable volume by degasser inlet 6. At the same time, the movement of fluid into the hydraulic system and return to the suction pipe 3 is excluded due to check valves 8 th 9. Simultaneously, the pumping of the fluid source pressure 4 through the hydraulic hydroelectric device to the degasser 6.

In the degasser 6, undissolved gas and the liquid containing it are separated, for example. using the field of gravitational-centrifugal forces to separate gas-liquid media with different densities. Gas is diverted into the atmosphere, and liquid is transferred to tank 1. After turning off the pressure source 4, at the end of the hydraulic system, the return spring 17 moves the small piston 15 to its original state.

Using the proposed method of gas removal from the hydraulic system and the device for its implementation can improve the reliability of the pressure source by reducing the hydraulic resistance (pressure loss) of the section from the tank to the pressure source'and, therefore, increasing the cavitation stock of the pressure source.

Claims (2)

Claim 1. The method of exhaust gas from the hydraulic system, which consists in moving before pumping a volume of liquid, equal in magnitude to the internal volume of the suction pipe, first into a closed chamber of variable volume, and then from the suction pipe to a degasser, characterized in that. in order to increase the reliability of the system, before pumping the liquid from the suction pipe, the liquid is first forced out of the tank into a closed chamber of variable volume, and then the pressure source is turned on and the liquid is directed from the chamber to the degasser. 2. Device for removing gas from the hydraulic system, containing a tank with a liquid, ha5 β the main cavity of which is connected to the gas accumulator through the bleed and non-return valves, and the liquid cavity - with the inlet of the suction pipe and the outlet of the degasser installed in the drain hydraulic line, a pressure source, a multiplier with a closed chamber of variable volume, including a small and a large piston and a spring kinematically connected together located in the inter-piston * cavity, the inlet of the degasser connected to the suction pipe through a second non-return valve, characterized in that the multiplier pistons are connected anes between a spring inter-piston chamber connected to the atmosphere, a smaller piston chamber - a yield of a pressure source, a variable volume chamber - to the input of the degasser, and the discharge line is provided with check valves at the inlet and outlet of the degasser.