DE2302343A1 - FUEL DRAIN SYSTEM - Google Patents

Description

PATENTANWÄLTE DipUng-WERNER COHAUSZ · Dipf.-Ing. WILHELM FLORACK . DipUng. RUDOLF KNAUF

4 Düsseldorf, Sdiumannitraße 97

Lucas Aerospace Liraited

¥ ell Street

GB-Birmingham January 17, 1973

Fuel drainage system

The invention "relates to a fuel off-flow system for an internal combustion engine or a turbine and in particular the arrangement for the fuel supply.

According to the invention is a drainage system for an arrangement for the fuel supply in an internal combustion engine or a turbine with a feed pump, which fuel is fed under pressure during operation, characterized in that a discharge tank, a jet pump downstream from the feed pump, a check valve, through the fuel the tank can be sucked in by the jet pump, and a float-operated one Tentil are provided to prevent flow from the Tank for jet pump can be actuated when the fuel in the tank falls below a setpoint value.

The invention is described below on the basis of exemplary embodiments Referring to the drawings explained in more detail. In the drawings are:

Fig. 1 is a detail in section, in which an embodiment of a Drainage system according to the invention is shown, and

Fig. 2 shows a corresponding representation of another embodiment.

According to FIG. 1, a gas turbine 10 has an associated fuel metering device 11, a high-pressure pump 12 and an auxiliary pump 1J. Drain connections from the turbine and the associated fuel supply arrangement (for example from fuel-lubricated bearings of pumps, Do- 27 017
Wa / Ti - 2 -

309831/0928

control units, etc.) are in communication with a drain tank 14. Downstream from auxiliary point 1J. there is a jet pump

9 with an inlet 15 and an outlet 16 through which fuel can flow from the pump 13 to the pump 12. Me jet pump 9 "has another input 17, which is connected to the drain tank 14 via a Mickschlagventil 18 and a float operated valve 19 in connection stands, both of which cooperate with a seat element 24, which is formed from a resilient material, for example polytetrafluoroethylene filled with graphite.

The float 20 assigned to the valve 19 sits in the tank 14 and is set up to close the valve 19 in order to prevent that air reaches the inlet 17 of the jet pump 9. The swimmer 20 is articulated on an arm 20a to which the valve 19 is connected. The valve 19 is in its closed position in a, conical Part of the seat element 24 shown, and the fluid levels of the Fuel in the tank 14 are shown at 21, 22 and 2.3, respectively, representing a horizontal flight, a maximum pitch angle and a maximum Descent angle for an aircraft corresponds to the turbine

10 is installed with the associated devices.

The check valve 18 is against the seat element 24 by a spring 24 cocked to the closed position to allow a flow of fuel from the pump 15 back into the tank 14.

Generated during operation from input 15 to output 16 of the jet pump flowing fuel a low pressure at inlet 17 that there is enough waste fuel in the tank 14 to keep the valve 19 open, this waste fuel is removed from the Tank 14 is sucked off and reaches the turbine 10 via the pump 12 and the metering device 11. The valve 19 prevents entrapment of air from tank 14 in the fuel stream to the turbine.

In the embodiment shown in FIG. 2, the tank 114 has one Outlet 114 at its lowest point, a valve body 115 sits on this output and receives the jet pump 109, which has an input

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109a and an output 109b in a main fuel line according to FIG 1 and an auxiliary inlet 109c, which is passed through a valve 117 is closed or opened. The valve 117 has a valve seat 118, which sits sealingly in the body 115, a closing member

119 sxLS rubber or some other elastomer as a check valve on a seed of the seat and a float operated closing member

120 on the other side of the seat.

There, s closing member 120 sits on an articulated arm 121 on his free 3 end has a claw 122, on which a splash on a Can attack float 12J. The swimmer can move freely in one Move housing 124, which has entrances 125 that open into tank 114 and controlled by a filter 126. The housing 124 forms in effect a free fitting guide for the swimmer to its allow vertical movement when the tank 114 is in its normal horizontal orientation.

The valve arrangement functions as in FIG. 1 to prevent the suction of air into the pump 109 tm <3 - to prevent a Entry of high pressure fuel into tank 114 via the valve assembly.

Patent claims

309831/0928

Claims (1)

Claims M Λ fuel drainage system for an arrangement for the fuel supply in an internal combustion engine or a turbine with a feed pump that fuel is supplied under pressure during operation, characterized in that that a drain tank, a jet pump downstream of the feed pump, a check valve, through which fuel can be drawn from the tank by the jet pump, and a float-operated valve are provided to prevent sticking from the tank to the jet pump when the fuel in the tank drops below one. Setpoint is actuatable. • 2. Fuel Abflußsj-stem according to claim 1, characterized in that the check valve and the float-operated valve are on opposite sides of a common seat element. " ⁷ J, fuel drainage system according to claim 1, characterized in that the float-operated valve has a float which is seated on an articulated arm on which the valve closing member is mounted. 4. fuel drainage system according to claim 2, characterized in that the float of the float-operated valve is seated in a housing that allows movement of the float to operate the valve. 5 · Fuel drainage system according to eAnspruch 4 »characterized in that the closure member of the float-operated valve is mounted on a hinge, the end of which is provided with a claw which can be gripped is provided on a splash on the swimmer. 6. Fuel drainage system according to claim 4 »or 5» characterized in that that the housing has input, which are in communication with the interior of the tank and are covered by a filter. , 309831/0928 Read e ί te