RU2327049C2 - Fuel distributor for gas turbine manifolds - Google Patents

Abstract

FIELD: aircraft engine engineering.

SUBSTANCE: device arranged in the line feeding fuel to the manifold incorporates an on-off control valve connecting the manifold, in one position, to the pressure source and, in another position, to the drain line. Apart from the said control valve, the line incorporates a shutoff valve with a damper at its inlet. The shutoff valve closing time is subject to the damper running through and is selected to ensure a complete removal of fuel from the drain line.

EFFECT: closing the manifold rules out the penetration of combustion and oxidation products from the combustion chamber into the manifold after cutting off or blowing through the manifolds.

2 cl, 2 dwg

Description

The invention relates to aircraft engine manufacturing, in particular, to devices for supplying fuel to the collectors and purging the manifolds of the gas turbine combustion chamber.

A device is known (see Aggregates of jet engines. M.V. Razdolin, D.N. Surnov. M., Mechanical Engineering, 1973, p. 165, Fig. 2.27), in which fuel supply and purge of the collectors are provided for account of mechanical movement of the stop valve spool by the engine control lever. The stop valve spool connects the manifold either to the fuel line or to the drain. When the collector is connected to the drainage, the remaining fuel from the collector, as well as from the supply line, where it flows from the pump to the complete stop of the engine rotor, is diverted to the drainage.

A device is known (see US patent No. 2712218, class 60-39.09, 1951), in which the fuel is supplied and the collectors of the afterburner of the GTE combustion chamber are purged automatically.

A two-position control valve is installed in the fuel supply line to the manifold, which, under the influence of the fuel pressure coming from the regulator, connects the collector either to the fuel line or to the drain when the fuel pressure drops in front of the valve.

The disadvantage of these devices is that after purging (fuel removal), the collector remains connected to the drain. When using these devices to shut off and purge the starting or afterburner manifolds and with the engine running, the products of combustion and oxidation with hot gases continue to flow into the manifold, which causes carbon formation in the nozzles and fuel lines of the collector.

As a result, the reliability and service life of the combustion chamber manifold are reduced.

The technical result, the achievement of which the claimed technical solution is directed, is to increase the reliability and service life of the combustion chamber manifold.

To achieve the specified technical result, the fuel distribution device for the collector of the combustion chamber of a gas turbine engine contains fuel lines for supplying fuel to the collector from a pressure source and drainage and a two-position control valve installed in the fuel supply line to the manifold with the possibility of connecting to a pressure source and drainage. In addition to the control valve, a shut-off valve is installed in the fuel supply line to the manifold, having a damper located at the entrance to the control cavity of the shut-off valve.

The closing time of the shutoff valve is determined by the pouring characteristic of the damper, selected from the condition of ensuring complete removal of fuel into the drainage.

Distinctive features, namely: the installation of a shut-off valve with a damper located at the inlet of the shut-off valve control cavity in series with the shut-off valve in the fuel supply line to the manifold, and that the closing time of the shut-off valve is determined by the pouring characteristic of the damper, selected to ensure full removal of fuel into the drain, can improve the reliability and service life of the collectors, because products of combustion and oxidation do not enter the collector after disconnecting and purging the starting or afterburning collectors.

The proposed device is presented in the drawings of figures 1 and 2, where figure 1 shows a diagram of a distribution device when the control valve connects the fuel inlet to the manifold, and figure 2 - the control valve in the position connecting the drain to the collector, and is described below.

A fuel distribution device for a gas turbine engine manifold comprises a fuel supply manifold highway 1, in which a two-position distribution valve 2 and a shutoff valve 3 are sequentially installed. Valve 2 is installed with the possibility of connection in the first position with a pressure source (fuel inlet) and with drainage in the second position. The shut-off valve 3 is equipped with a spring 4 and has a damper 5 at the entrance to the control cavity. The spill of the damper 5 determines the closing time of the shut-off valve 3, selected from the condition of ensuring complete removal of fuel in the drain.

The device operates as follows.

When the control valve connects the inlet pressure to the fuel supply manifold 1, the shutoff valve 3 opens by the action of the inlet pressure and spring 4 and connects the manifold to the fuel supply 1.

When the control valve 2 closes the fuel inlet and connects the fuel supply line 1 to the drain, the pressure in front of the shutoff valve 3 from the side of the spring 4 drops, valve 3 closes and disconnects the collector from the line 1. The closing time of valve 3 is set by the damper 5 from the condition for complete removal of fuel residues from the collector.

Claims (2)

1. A fuel distribution device for a gas turbine engine manifold, comprising fuel lines for supplying fuel from a pressure source to a manifold and a drain, a two-position control valve installed in a line for supplying fuel to a manifold with a possibility of connecting to a pressure source and a drain, characterized in that in a fuel supply line an additional shut-off valve is installed to the manifold, having a damper located at the entrance to the control cavity of the shut-off valve. 2. The fuel distribution device according to claim 1, characterized in that the closing time of the shutoff valve is determined by the pouring characteristic of the damper selected from the condition of ensuring complete removal of fuel in the drain.

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