Drain system

FIELD: mechanical engineering; gas-turbine engines.

SUBSTANCE: system is designed for utilization of fuel leaks in drain systems of gas-turbine engines. Proposed system contains drain tank divided into upper and lower spaces by spring-loaded flexible partition. Upper space is connected through check valve and drain valve with nozzle manifolds, through other check valve, with atmosphere, and through third check valve, with fuel pump input. Lower space is connected with high-pressure source through pressure selector. Fuel-air medium sensor is installed under check valve communicating with atmosphere. Selector is made in form of electromagnetic valve with spool device. Check valve connected with fuel pump is located lower than minimum permissible fuel level in tank, level being set by program. Such design of drain system precludes getting of air to fuel pump input and meets ecological requirements as to effective combustion of fuel owing to return of fuel from drain tank into fuel tank at steady state operating conditions of engine.

EFFECT: provision of pollution-free engine.

1 dwg

 

The invention relates to the utilization of fuel leakage in the drainage systems of gas turbine engines.

Known fuel drainage system (see UK patent No. 1294820, F 02 C 7/22, 1971), containing the drainage tank is divided into two elastic cavity wall, the upper chamber of the tank is connected with a supply of air to the air starter, and the lower cavity through the drain valve with manifold nozzles and through the check valve with the atmosphere. Accumulated drain leakage during each run, pushed into the fuel manifold.

The disadvantage of this system is that at the start replaced fuel cannot effectively burn, as is the additional fuel supplied by the launcher, so during startup to provide a complete, efficient combustion of fuel.

The closest technical solution is the fuel drainage system (see U.S. patent No. 4149372, F 02 C 7/22, 1976), containing drainage tank installed inside on the spring loaded piston, the elastic partition wall, drainage divides the tank into two cavities, the upper cavity of the tank through the open check valve and a drain valve connected to the collector of the injector, through another check valve with the atmosphere, and through the third check valve from the inlet to the fuel pump. The lower cavity drain tank through re is luchtel connected to the air pressure behind the starter. On each run of the accumulated drainage leaks are displaced air supplied into the lower cavity. The air from the drainage tank is removed through a check valve connected with the atmosphere, until the replacement of air in the fuel, then the pressure increases, the drain valve closes and opens the check valve connected with the inlet of the pump.

The disadvantage of this system is the lack of guaranteed removal of air and the possibility of air bubbles at the inlet to the fuel system.

The objective of the invention is the creation of toplisttenage system, eliminating the possibility of air entering at the inlet to the fuel pump while ensuring environmental requirements for efficient combustion of the fuel due to the fuel return from the drain tank to the fuel pump on steady-state conditions of the engine.

The problem is solved in that the fuel drain system containing drainage tank, split spring elastic partition wall, the upper chamber of the tank above the partition through the check valve and the drain valve is connected to the collectors of nozzles through another check valve with the atmosphere, and through the third check valve from the inlet to the fuel pump, the lower cavity of the tank under the wall, through the pressure switch is connected to a source of high pressure non-return valve, connected to the atmosphere, set the sensor environment (fuel - air), the pressure switch is made in the form of an electromagnetic valve with Bolotnikova device, and a check valve connected to the fuel pump is located below the lowest possible level of fuel in the tank.

The system is represented in the drawing and described below.

The system contains a drainage tank 1, a split spring elastic partition 2 on the top 3 and bottom 4 of the cavity. The upper cavity 3 of the tank 1 through the check valve 5 and the drain valve 6 is connected to the collectors of the nozzles, through the check valve 7 with the atmosphere, and through the check valve 8 from the inlet to the fuel pump. The lower cavity 4 of the fuel tank through the pressure switch 9 is connected to a source of high pressure (rvh+1atm). Under non-return valve 7 is installed the sensor 10 environment (fuel - air). The switch 9 is made in the form of an electromagnetic valve located inside an on / off valve 11. The check valve 8 is located below the lowest possible level of fuel in the tank, which is set by the program.

The system works as follows.

Drained from the reservoir GTE fuel through the drain valve 6 and a check valve 5 flows into the upper chamber 3 drain tank 1, which is connected through a check valve 7 with the surrounding atmosphere, which are displaced in the spirit, a pair of fuel and then the fuel itself.

As the filling of the drainage tank fuel goes up and at the moment of its contact with the sensor environment 10 produces an electrical signal for triggering the pressure switch 9, which moves the spool 11 in a position where the cavity 4 is detached from the entrance to the pump and is connected to a source of high pressure (rvh+1atm). Received in the cavity of the increased pressure compresses the spring and the elastic partition 2, displacing from the cavity 3 of the accumulated drainage leakage of fuel through the check valve 8 in the intake side of the pump.

To exclude the ingress of air to enter the pump check valve 8 is located below the lowest possible level of fuel in the tank and constantly filled with fuel remaining after dewatering system.

When replacement of the fuel return valves 5 and 7 are closed under the action of increased pressure inside the tank 1. Wipe the drain leaks occur before setting the plate spring to a mechanical stop on the enclosure of the sensor environment. After ousting the power switch 9 is removed, the valve 11 is returned to its original position and the elastic partition wall 2 under the action of the spring returns to its original position.

Thus, due to the fact that under non-return valve connected to the atmosphere, set the sensor environment (that is Levi - air), the pressure switch is made in the form of an electromagnetic valve with Bolotnikova device, and a check valve connected to the fuel pump is located below the lowest possible level of fuel in the tank, prevents the ingress of air at the inlet to the fuel pump while ensuring environmental requirements for efficient combustion due to the fact that at steady state drain leakage is not incinerated in the atmosphere and returned to the inlet to the fuel pump.

Fuel drainage system with drainage tank, split spring elastic partition wall, the upper chamber of the tank above the partition through the check valve and the drain valve is connected to the collector of the injector, through another check valve with the atmosphere, and through the third check valve from the inlet to the fuel pump, the lower cavity of the tank under the wall, through the pressure switch is connected with a source of high pressure, characterized in that under non-return valve connected to the atmosphere, set the sensor environment (fuel - air), the pressure switch is made in the form of an electromagnetic valve with Bolotnikova device, and a check valve connected fuel pump is located below the lowest possible level of fuel in the tank.



 

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Drain system // 2244142

FIELD: mechanical engineering; gas-turbine engines.

SUBSTANCE: system is designed for utilization of fuel leaks in drain systems of gas-turbine engines. Proposed system contains drain tank divided into upper and lower spaces by spring-loaded flexible partition. Upper space is connected through check valve and drain valve with nozzle manifolds, through other check valve, with atmosphere, and through third check valve, with fuel pump input. Lower space is connected with high-pressure source through pressure selector. Fuel-air medium sensor is installed under check valve communicating with atmosphere. Selector is made in form of electromagnetic valve with spool device. Check valve connected with fuel pump is located lower than minimum permissible fuel level in tank, level being set by program. Such design of drain system precludes getting of air to fuel pump input and meets ecological requirements as to effective combustion of fuel owing to return of fuel from drain tank into fuel tank at steady state operating conditions of engine.

EFFECT: provision of pollution-free engine.

1 dwg

FIELD: mechanical engineering; engines.

SUBSTANCE: invention is designed for draining fuel leaks from manifold and returning fuel into engine fuel system. Proposed device contain drain tank connected with drain fuel source, ejector with working nozzle, outlet and receiving chamber, drain tank shutoff valve, float installed in drain tank and connected with shutoff valve. Constant pressure valve connected with ejector outlet is installed at inlet of ejector working nozzle. Throttling needle with spring and piston is installed in working nozzle of ejector. One space of piston being connected with drain space and the other, with ejector outlet.

EFFECT: prevention of cavitation in ejector and getting of air into fuel system.

1 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to devices and methods of combustion of fuel-air mixture in air-jet engines, small-size gas-turbine engines and gas-turbine plants. Proposed low-pressure nozzle contains annular atomizing edges, body accommodating central air swirler, channel to feed fuel with auger swirler, and outer air swirler arranged on nozzle body. Channel to supply swirled high-pressure air is arranged around fuel feed channel. Two-tier jet outer air swirler is provided with outer and inner inclined holes, air vortex stabilizer and annular outer and inner atomizing edges. Method of fuel atomizing by low-pressure nozzle comes to delivery of fuel and pressure feeding of air through central swirler and outer swirler. Fuel is fed between two swirler air flows formed by central swirler and channel to supply swirler high-pressure air. Flows of air and fuel getting to annular atomizing edges of nozzle form finely dispersed fuel air-mixture. Drops of mixture are atomized by air jets of outer swirler first on its inner annular atomizing edge, and then on outer edge. Said peculiarities of proposed invention increase payload capacity of aircraft, reduce exhaust of harmful substances.

EFFECT: reduced energy losses and expenses.

3 cl, 1 dwg

FIELD: rocketry and aeronautical engineering; fuel systems of flying vehicles.

SUBSTANCE: device proposed for realization of this method includes fuel tanks connected in succession by means of pipe lines; sequence of fuel utilization is estimated by intensity of heating of fuel contained in them.

EFFECT: reduction of temperature at engine plant inlet.

3 cl, 1 dwg

FIELD: metered delivery of fluid medium from supply source to users.

SUBSTANCE: proposed meter includes metering valve sliding in body at working stroke C; this valve has inlet hole for receiving fluid medium from supply source and outlet for discharge of fluid medium to user. Meter is provided with passage for fluid medium for performing washing motion of fluid medium over contact surfaces of valve and body. Passage is formed by helical groove at width L and screw pitch P. Besides that injector is proposed which is fitted with this meter.

EFFECT: avoidance of accumulation of contaminants during flow of fluid medium through meter.

3 cl, 3 dwg

FIELD: mechanical engineering; turbomachines.

SUBSTANCE: proposed fuel injection system contains high-pressure pump for delivering fuel at high pressure from fuel tank, fuel nozzles arranged in combustion chamber of turbomachine and metering device located between said high-pressure pump and fuel nozzles to control rate of fuel getting into fuel nozzles from high-pressure pump. Metering device contains delivery valve operated in accordance with two delivery levels by metering valve to which fuel is delivered from said high-pressure pump. Electrically controlled shutoff valve is provided additionally to cut off fuel delivery to said fuel nozzles.

EFFECT: possibility of limiting heating of fuel and setting optimum dimensions of system components.

5 cl, 2 dwg

FIELD: devices for mixing of fuel components including gaseous and liquid fuel, water vapor and air before their supply to the combustion chamber.

SUBSTANCE: the mixer of fuel components has a fuel supply manifold and a system for preparation of the fuel-containing mixture including a device of multi-point fuel injection. The system for preparation of the fuel-containing mixture is made in the form of a single Venturi tube, the device of multi-point fuel injection installed in the Venturi tube up to its critical section is made in the form of a tore-shaped stream-lined manifold with openings on the outer and inner surfaces. The tore-shaped manifold of multi-point injection is tear-shaped.

EFFECT: simplified and lightened construction of the mixer, reduced friction loss.

2 cl, 2 dwg

FIELD: gas-turbine plants.

SUBSTANCE: system comprises nozzle provided with internal axial space that is terminated by the outlet port for fuel-air mixture at one of its ends. The nozzle has first stage for supplying fuel provided with several first fuel supply openings that enter the internal space, are arranged around the axis of the nozzle, and are connected with the inlet fuel zone through fuel supply passages, and at least one passage for air supply that enters the internal axial space and is connected with the inlet air zone. The nozzle is additionally provided with at least second stage for fuel supply provided with several second fuel supply openings that enter the internal space, are arranged around the axis of the nozzle, and are connected with the inlet fuel zone of the nozzle through the fuel supply passages. The fuel supply passages are in part in coincidence with the fuel supply passages of the first stage.

EFFECT: enhanced quality of fuel-air mixture.

18 cl, 8 dwg

FIELD: mechanical engineering; turbomachines.

SUBSTANCE: fuel system of turbomachine combustion chamber has fuel-feed nozzle providing spraying of fuel in combustion chamber, and mixing-and-deflecting unit arranged symmetrically relative to axis of fuel-feed nozzle and designed to form mixture of fuel oxidizer with fuel and its atomizing in said combustion chamber. Mixing-and-deflecting unit has first swirler and, at least, second swirler arranged with relative displacement along said axis and separated by venture device arranged coaxially relative to fuel-feed nozzle. First swirler is rigidly fastened to said fuel-feed nozzle and is arranged at constant distance from nozzle in radial direction. Distance is chosen so that fuel atomized by fuel-feed nozzle cannot get onto said first swirler.

EFFECT: provision of good atomizing of fuel under all conditions.

5 cl, 5 dwg

FIELD: power engineering.

SUBSTANCE: method comprises injecting compressed air into the system for supplying fuel to the nozzle. The compressed air is injected directly to the fuel injection head downstream of the valves. The injecting is controlled by the signal characteristic for a given stage of operation of the turbine machine. The compressed air is taken at the exit of the compressor, is collected in a tank, and then is injected to the head through the internal pipeline.

EFFECT: enhanced reliability.

12 cl, 8 dwg

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