To provide a turbo-machine to prevent lubricating agent from leaking out through a seal.
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.
| WO/2019/075283 | TURBOCHARGER HAVING THRUST BEARING ASSEMBLY |
| JP5101357 | Rotating machine and additional ring |
| JP5210804 | Sealing of rotoring in turbine stage |
DAHL NILS G
PLANTE KEVIN M
WU CHARLES C
LOCONTO CHRISTOPHER J
| JPS5252014A | 1977-04-26 | |||
| JP2004003494A | 2004-01-08 | |||
| JP2001342850A | 2001-12-14 | |||
| JPS5784335U | 1982-05-25 | |||
| JPS4616202B1 | ||||
| JPS4018414Y1 | ||||
| JPS55123635U | 1980-09-02 |
| US2988325A | 1961-06-13 |
Tomioka Kiyoshi
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