| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbo-machine to prevent lubricating agent from leaking out through a seal. SOLUTION: A housing 12 of a turbo fan engine 10 is provided with a wall 23 and dome 25 demarcating a buffer chamber 33 to receive bleed air of a compressor. Seals 26, 28 including a lubricating side and an air side 30 are disposed between a turbine shaft 16 and the housing 21, and separate a bearing chamber 20 and the buffer chamber 33. A buffer tube 38 is connected to a main body 22 of the buffer chamber 33 via an inlet 36, and contains a flow rate controller 46 such as a venturi tube 50, etc., disposed in an outlet of the tube 38. The tube 38 feeds air from a compressor bleed source 40 into the main body 22, introduces the flow in the tangential direction for an inside surface 24 and generates a swirling flow in the buffer chamber 33. Thereby, the uniformly radial pressure gradient is generated to prevent the lubricating agent from leaking out through the seal in an idling state. COPYRIGHT: (C)2008,JPO&INPIT
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