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A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The system is for an auxiliary power unit having at least a compressor portion of a gas turbine engine and an oil cooler contained separately within a nacelle. The system includes the auxiliary power

A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The system is for an auxiliary power unit having at least a compressor portion of a gas turbine engine and an oil cooler contained separately within a nacelle. The system includes the auxiliary power unit housed within the nacelle of the aircraft, an engine exhaust opening defined in the aft portion of the nacelle and communicating with the gas turbine engine, at least a first air inlet duct communicating with a second opening defined in said nacelle and with said compressor portion and the oil cooler is located within a second duct communicating with an opening other than the engine exhaust opening of said nacelle and with the engine exhaust opening. Exterior cooling air and engine exhaust ejected through said engine exhaust opening entrain cooling air through said second duct to said oil cooler, and thus provide engine oil cooling. An exhaust eductor is also provided.

대표청구항 ▼

A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The system is for an auxiliary power unit having at least a compressor portion of a gas turbine engine and an oil cooler contained separately within a nacelle. The system includes the auxiliary power

A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The system is for an auxiliary power unit having at least a compressor portion of a gas turbine engine and an oil cooler contained separately within a nacelle. The system includes the auxiliary power unit housed within the nacelle of the aircraft, an engine exhaust opening defined in the aft portion of the nacelle and communicating with the gas turbine engine, at least a first air inlet duct communicating with a second opening defined in said nacelle and with said compressor portion and the oil cooler is located within a second duct communicating with an opening other than the engine exhaust opening of said nacelle and with the engine exhaust opening. Exterior cooling air and engine exhaust ejected through said engine exhaust opening entrain cooling air through said second duct to said oil cooler, and thus provide engine oil cooling. An exhaust eductor is also provided. a fulcrum toward the veneer roll and the drive guide bands being put in press contact with part of a circumferential surface of the veneer roll; a fold-back member disposed in an opposite position to a circumference of the base end section of the drive guide bands with an arbitrary spatial interval therebetween such that the drive guide bands are connected with a fold-back conveyor; a plurality of thread reels that are provided in downstream positions from the unwinding position; a travel member that is provided in a freely reciprocating manner to or away from the plurality of thread reels with a backward movement limit thereof in an upstream side from the unwinding position; a plurality of grasping members that grasp terminal ends, which are free fore-ends, of threads that hang down from a veneer roll, the threads being wound as guide for a veneer sheet on the veneer roll in plural rows along a length direction thereof; and nozzles respectively provided on the grasping members that communicate with an air duct, wherein the free ends of the threads are grasped when the travel member advances, the threads are wound on the thread reels by air streams from the nozzles at a travel member forward movement limit and then the threads continue to be wound on the thread reels in synchronism with unwinding of the veneer sheet from the veneer roll. 6. A veneer roll unwinding apparatus comprising: a take-up reel on which a veneer sheet is wound to form a veneer roll, rotatably supported with bearings at both ends thereof at an unwinding position; drive guide bands provided in plural rows in a shaft direction of the take-up reel with a position below the unwinding position with a base end and a distal end of the drive guide bands as a free end, the distal end of drive guide bands being freely swingable with the base end as a fulcrum toward the veneer roll and the drive guide bands being put in press contact with part of a circumferential surface of the veneer roll; a fold-back member disposed in an opposite position to a circumference of the base end section of the drive guide bands with an arbitrary spatial interval therebetween such that the drive guide bands are connected with a fold-back conveyor; a plurality of thread reels provided at a position downstream from the unwinding position in a corresponding manner to threads, which are wound on a veneer roll as guide for a veneer sheet in plural rows along a length direction of the veneer roll and whose free ends hang down from the veneer roll; a frame on which the plurality of thread reels are disposed and which is movable in a freely reciprocating manner to or away from the unwinding position in a position downstream side from the unwinding position; and suction holes that communicate with an exhaust duct and which are respectively formed at winding portions of the plurality of thread reels, wherein after the threads are wound on the thread reels by an exhaust stream to the suction holes when the frame is positioned at a forward movement limit of the frame, the frame returns to an original position thereof and then the threads continue to be wound on the thread reels in synchronism with unwinding of a veneer sheet from the veneer roll. 7. A veneer roll unwinding apparatus comprising: a take-up reel on which a veneer sheet is wound to form a veneer roll, rotatably supported with bearings at both ends thereof at an unwinding position; drive guide bands provided in plural rows in a shaft direction of the take-up reel with a position below the unwinding position with a base end and a distal end of the drive guide bands as a free end, the distal end of drive guide bands being freely swingable with the base end as a fulcrum toward the veneer roll and the drive guide bands being put in press contact with part of a circumferential surface of the veneer roll; a fold-back member disposed in an opposite position to a circumference of the base end section of the drive guide bands wit h an arbitrary spatial interval therebetween such that the drive guide bands are connected with a fold-back conveyor; and unwinding rollers disposed at positions downstream from the unwinding position such that both or one of the unwinding rollers can freely be moved to or away from each other, or the other, and the unwinding rollers work for unwinding threads at the positions corresponding to the threads, which are wound on a veneer roll as guide for a veneer sheet in plural rows along the shaft direction of the veneer roll, whose free ends hang from a veneer roll, wherein after the unwinding rollers take up and pinch threads therebetween by moving to each other, the threads are wound on the thread reels in synchronism with unwinding of a veneer sheet from the veneer roll. 8. A veneer roll unwinding apparatus for a veneer roll comprising: a correcting member that gets into contact with and holds threads on the downstream side of a veneer roll in a forward movement thereof, the threads being wound on a veneer roll in plural rows in a length direction of the veneer roll, and bring the threads in holding into a firmly stretching condition in a downward movement, and wherein the correcting member is freely movable, forward or backward, relative to the downstream side of the veneer roll and freely shiftable upward or downward with the help of a moving block connecting to an elevating mechanism and a forward/backward movement mechanism, wherein when the correcting member moves forward, the correcting member is put into contact with the threads wound in plural rows in a length direction of the veneer roll and holds the threads, while when the correcting member moves downward, the correcting member forces the threads in holding into a firmly stretching condition. 9. A veneer roll unwinding apparatus for a veneer roll according to claim 8, wherein a fluid cylinder is attached to a moving block that is freely shiftable upward or downward by means of a elevating mechanism and the correcting member that is swingably attached to a fore-end of a piston rod of the fluid cylinder with an arm interposed therebetween is swingably movable, forward or backward, relative to the downstream side of the veneer roll, wherein when the correcting member moves forward, the correcting member is put into contact with the threads wound on the veneer roll in plural rows in a length direction thereof and holds the threads, while when the correcting member moves downward by means of the elevating mechanism, the correcting member forces the threads in holding into a firmly stretched condition. 10. A veneer roll unwinding apparatus for a veneer roll comprising: threads being wound on the veneer roll in plural rows in a length direction of the veneer roll as guide, and a correcting member that gets into contact with the downstream side of a veneer roll and holds threads on the veneer roll in a forward movement thereof, and wherein the correcting member bring the threads in holding into a firmly stretching condition in a backward movement by means of a forward/backward movement mechanism. 11. A veneer roll unwinding apparatus for a veneer roll comprising: a correcting member that gets into contact with and holds threads on the downstream side of a veneer roll in a forward movement thereof, the threads being wound on a veneer roll in plural rows in a length direction of the veneer roll, and bring the threads in holding into a firmly stretching condition in a downward movement, and wherein vacuum holes that hold the threads are formed on a side of the correcting member, facing the veneer roll. 12. A veneer roll unwinding apparatus for a veneer roll comprising: a correcting member that gets into contact with and holds threads on the downstream side of a veneer roll in a forward movement thereof, the threads being wound on a veneer roll in plural rows in a length direction of the veneer roll, and bring the threads in holding into a firmly s