Emergency hydraulic power system

Claim 2

A turbine drive assembly, comprising: a rotary turbine, a source of fuel fluid for the turbine, pump means for delivering fuel to the turbine, said pump being drivingly connected to rotate at a speed proportional to the speed of the turbine, and means for maintaining a substantially constant turbine speed under varying load conditions including valve means for delivering fuel to the turbine, and pilot means responsive to fuel fluid from the pump means for adjusting the valve means to increase fuel flow to the turbine when the speed thereof drops below a predetermined value and for adjusting the valve means to decrease the fuel flow to the turbine when the speed thereof increases above a predetermined value.

Claim 3

A turbine drive assembly, comprising: a rotary turbine, a source of fuel fluid for the turbine, pump means for delivering fuel to the turbine, said pump being drivingly connected to rotate at a speed proportional to the speed of the turbine, means for maintaining a substantially constant turbine speed under varying load conditions including valve means responsive to fuel fluid from the pump means for increasing fuel flow to the turbine when the speed thereof drops below a predetermined value and for decreasing the fuel flow to the turbine when the speed thereof increases above a predetermined value, and a bistable fuel control valve, said bistable fuel control valve opening when the speed of the turbine drops below a predetermined value and closing when the speed of the turbine exceeds a predetermined value.

Claim 4

A turbine drive assembly, comprising: a rotary turbine, a source of fuel fluid for the turbine, pump means for delivering fuel to the turbine, said pump being drivingly connected to rotate at a speed proportional to the speed of the turbine, means for maintaining a substantially constant turbine speed under varying load conditions including valve means responsive to fuel fluid from the pump means for increasing fuel flow to the turbine when the speed thereof drops below a predetermined value and for decreasing the fuel flow to the turbine when the speed thereof increases above a predetermined value, and a bistable fuel control valve, said bistable fuel control valve opening when the speed of the turbine drops below a predetermined value and closing when the speed of the turbine exceeds a predetermined value.

Claim 5

A turbine drive assembly, comprising: a rotary turbine, a source of fuel fluid for the turbine, pump means for delivering fuel to the turbine, said pump being drivingly connected to rotate at a speed proportional to the speed of the turbine, means for maintaining a substantially constant turbine speed under varying load conditions including valve means responsive to fuel fluid from the pump means for increasing fuel flow to the turbine when the speed thereof drops below a predetermined value and for decreasing the fuel flow to the turbine when the speed thereof increases above a predetermined value, a bistable fuel control valve for controlling the flow of fuel fluid from the pump means to the turbine, said fuel control valve being movable from an opened position to a closed position, a fluid pressure responsive pilot valve for shifting said fuel control valve from the opened position to the closed position, and means communicating outlet fuel fluid from said pump means to said pilot valve so that the pilot valve is responsive to the pressure of fuel fluid.

Claim 6

A turbine drive assembly, comprising: a rotary turbine, a source of fuel fluid for the turbine, pump means for delivering fuel to the turbine, said pump being drivingly connected to rotate at a speed proportional to the speed of the turbine, means for maintaining a substantially constant turbine speed under varying load conditions including valve means responsive to fuel fluid from the pump means for increasing fuel flow to the turbine when the speed thereof drops below a predetermined value and for decreasing the fuel flow to the turbine when the speed thereof increases above a predetermined value, a bistable fuel control valve for controlling the flow of fuel fluid from the pump means to the turbine, said fuel control valve being movable from an opened position to a closed position, a fluid pressure responsive pilot valve for shifting said fuel control valve from the opened position to the closed position, and means communicating outlet fuel fluid from said pump means to said pilot valve so that the pilot valve is responsive to the pressure of fuel fluid.

Claim 7

A turbine drive assembly as defined in claim 3, wherein said pilot valve is resiliently biased in opposition to fuel fluid pressure, said pilot valve being constructed to shift at a predetermined pressure against the biasing force thereon and direct fuel fLuid pressure to the fuel control valve for moving the latter from the first position to the second position, said predetermined pressure being that pump means outlet pressure that corresponds substantially with the desired turbine speed.

Claim 8

A turbine drive assembly as defined in claim 3, wherein said pump means is constructed to provide outlet fuel fluid at a pressure proportional to the square of the turbine speed.

Claim 9

A turbine drive assembly as defined in claim 5, wherein said pump means is a centrifugal pump.

Claim 10

A turbine drive assembly as defined in claim 3, including resilient means biasing said fuel control valve to the open position so that fuel control valve is normally fully open to provide unobstructed fuel flow from the pump means to the turbine.

Claim 11

A turbine drive assembly as defined in claim 7, including spring means biasing said pilot valve to a position placing the control valve in the open position.

Claim 12

An emergency hydraulic power supply system for an aircraft, comprising: a rotary turbine, a reducing gear box driven by the turbine, a hydraulic pump driven by the gear box and adapted to supply hydraulic fluid to the airfraft''s hydraulic system, a source of fuel for the turbine, control means for the source of fuel to maintain a substantially constant turbine speed including a fuel pump driven at a speed proportional to the turbine speed, passage means connecting the outlet of the fuel pump to the turbine, and fuel control valve means in said passage means, pilot means opening said valve means and porting fluid to the turbine when the pressure decreases below a predetermined value and for closing said valve means and terminating fuel flow to the turbine when the pressure increases above a predetermined value.

Claim 13

An emergency hydraulic power supply system for an aircraft, comprising: a rotary turbine, a reducing gear box driven by the turbine, a hydraulic pump driven by the gear box and adapted to supply hydraulic fluid to the airfraft''s hydraulic system, a source of fuel for the turbine, control means for the source of fuel to maintain a substantially constant turbine speed including a fuel pump driven at a speed proportional to the turbine speed, passage means connecting the outlet of the fuel pump to the turbine, and fuel control valve means in said passage means, pilot means opening said valve means and porting fluid to the turbine when the pressure decreases below a predetermined value and for closing said valve means and terminating fuel flow to the turbine when the pressure increases above a predetermined value.

Claim 14

An emergency hydraulic power supply system for an aircraft, comprising: a rotary turbine, a reducing gear box driven by the turbine, a hydraulic pump driven by the gear box and adapted to supply hydraulic fluid to the aircraft''s hydraulic system, a source of fuel for the turbine, control means for the source of fuel to maintain a substantially constant turbine speed including a fuel pump driven at a speed proportional to the turbine speed, passage means connecting the outlet of the fuel pump to the turbine, fuel control valve means in said passage means responsive to fuel fluid pressure from said fuel pump for opening and porting fluid to the turbine when the pressure decreases below a predetermined value and for closing and terminating fuel flow to the turbine when the pressure increases above a predetermined value, a decomposition chamber for porting fuel from said passage means and conveying hot decomposition gases to the turbine, said fuel source including a monopropellant fuel tank connected to deliver fuel to the fuel pump, and a pilot valve for controlling said fuel valve in bistable fashion, said pilot valve being biased in a first direction by a spring and biased in the opposite direction by outlet fluid pressure from the fuel pump, said pilot valve being constructed to shift said fuel control valve to a closed position when the pressure acting on the pilot valve exceeds a predetermined value corresponding substantially to that outlet pressure of the fuel pump which is produced at the desired turbine speed.

Claim 15

An emergency hydraulic power supply system for an aircraft, comprising: a rotary turbine, a reducing gear box driven by the turbine, a hydraulic pump driven by the gear box and adapted to supply hydraulic fluid to the aircraft''s hydraulic system, a source of fuel for the turbine, control means for the source of fuel to maintain a substantially constant turbine speed including a fuel pump driven at a speed proportional to the turbine speed, passage means connecting the outlet of the fuel pump to the turbine, fuel control valve means in said passage means responsive to fuel fluid pressure from said fuel pump for opening and porting fluid to the turbine when the pressure decreases below a predetermined value and for closing and terminating fuel flow to the turbine when the pressure increases above a predetermined value, a decomposition chamber for porting fuel from said passage means and conveying hot decomposition gases to the turbine, said fuel source including a monopropellant fuel tank connected to deliver fuel to the fuel pump, and a pilot valve for controlling said fuel valve in bistable fashion, said pilot valve being biased in a first direction by a spring and biased in the opposite direction by outlet fluid pressure from the fuel pump, said pilot valve being constructed to shift said fuel control valve to a closed position when the pressure acting on the pilot valve exceeds a predetermined value corresponding substantially to that outlet pressure of the fuel pump which is produced at the desired turbine speed.