| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently regulate flow speed of a seal part, suppress leaking flow, and prevent self-excited vibration of a rotary shaft by changeably forming a seal part passage shape using a shape memory alloy and bimetal for a material for forming a fin part or a groove part of a seal part. SOLUTION: In a turbo machine, after passing through a space (a) a fluid passes an impeller 11, and discharged to a passage 10. A part thereof passes a clearance (b) formed on a back surface of the impeller 11, and leaks from a space (d) passing through a seal part passage 15. The seal part passage 15 is divided into several chambers by fins 17 attached on a seal ring 16, and a flow rate of the fluid leaked from the seal part passage 15 is reduced by energy loss caused by friction when the fluid passes those chambers. In this time, the fin 17 is formed of shape memory alloy or bimetal. When a fluid temperature in a seal changes, the fin 17 is deformed. It is thus possible to reduce leaking flow of the seal part, and it is also possible to prevent self-excited vibration of a rotary shaft 12.</p> |
