CS244282B1 - Medium continuous supply connection in its extraction point - Google Patents

Abstract

The invention solves the problem of continuous supply media to its appliance at zero, positive negative overload, especially for delivery fuel to the aircraft engine the essence of the invention is that between centrifugal pump (2) tank (1) and appliance a check valve is connected to the media (4) (3) and hydraulic-pneumatic accumulator (6), with the centrifugal pump outlet (2) is connected via a non-return valve (3) with the media appliance (4) and with hydraulic space (7) hydraulic pneumatic accumulator (6), whose air space (8) is connected via overpressure a valve (11) and a filter (12) with a source air (13).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a circuit for the continuous supply of medium to its consumer at zero, positive and negative overload, in particular for supplying fuel to an aircraft engine.

So far, fuel delivery to the aircraft engine at zero, positive or negative overload has been solved either by another special tank with a pump at the top of the gravity valve or by a single pump with upper and lower inlet or a special tank with gravity check valves and flexible hose before into a single pump suction, constantly submerged by gravity into the medium.

While these solutions do not require compressed air sources, there is no fuel supply at zero overload, which may expose the pump suction. Furthermore, these solutions include moving parts and are characterized by higher weight, which is particularly disadvantageous when used on airplanes.

These disadvantages are eliminated by the connection for the continuous supply of the medium to the collection point at zero, positive and negative overload, consisting of a medium tank with a centrifugal pump and a medium consumer, that a non-return valve and a hydraulic pneumatic accumulator are connected between the centrifugal tank pump and the medium. wherein the outlet of the centrifugal pump is connected via a non-return valve to both the medium consumer and the hydraulic space of the hydraulic-pneumatic accumulator, the air space of which is connected via an overpressure valve and filter to an air source.

The advantage of the circuitry according to the invention is to ensure a continuous supply of the medium in case of any overload changes at a low system weight.

An exemplary embodiment of the circuit according to the invention is shown in the accompanying drawing, in which Fig. 1 is a positive overload year, Fig. 2 is a negative overload year, and Fig. 3 is a zero overload year.

The outlet of the centrifugal pump 2 of the tank 1 is connected via the non-return valve 6 to the medium consumption device 6 and to the hydraulic space 2 of the hydraulic-pneumatic accumulator 6. The air space 8 of the hydraulic-pneumatic accumulator 6 is connected via a pressure relief valve 11 and a filter 12 244,282

When positively overloaded (Fig. 1), the medium 14 from the tank 1 supplied under pressure by the centrifugal pump 2 pushes the non-return valve 2 and is pushed both into the hydraulic space X of the hydraulic pneumatic accumulator 6 until equilibrium is formed on its membrane 2. 4, this is the motor ·

In the case of a negative overload (FIG. 2), the medium 14 in the tank 1 flows into a space out of reach of the centrifugal pump 2, which rotates idle and thus does not supply the necessary medium. The air in the air space 8 of the hydraulic-pneumatic accumulator 6 presses on the diaphragm which pushes the medium 14 out of the hydraulic space 2, which both closes the non-return valve J by its pressure and flows to the medium consumer 4.

At zero overload (Fig. 3) »this means that the centrifugal pump 2 ceases to apply pressure almost immediately at no load and the function is performed in the same way as a negative overload.

The wiring according to the invention can be used wherever there is a need to ensure a continuous supply of the medium to the appliance at negative or zero overload, especially in aircraft fuel systems.

Claims (1)

Connection for continuous supply of medium to the point of collection at zero, positive and negative overload, consisting of a medium tank with a centrifugal pump and a medium consumer, characterized in that between the centrifugal pump (2) of the tank (1) and the medium consumer (4) a non-return valve (3) and a hydraulic-pneumatic accumulator (6) are connected, the outlet of the centrifugal pump (2) being connected via a non-return valve (3) to the medium consumer (4) and to the hydraulic space (7) of the hydraulic pneumatic accumulator (6) whose air space (8) is connected to an air source (13) via a pressure relief valve (11) and a filter (12).