F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
F01D 11/08 (2006.01) F01D 9/02 (2006.01) F01D 11/10 (2006.01) F01D 11/24 (2006.01)
Patent
CA 2261531
A clearance control system for a turbine seal, which optimizes a clearance by controlling the change in the clearance during a run due to a thermal elongation by cooling the sealing air. The air from a compressor is cooled by a cooler 12 and is guided via an outer shroud 22 and a tube 28 in a stationary blade 21 into a cavity 26 in an inner shroud 23. The air flows through a space 34 from a seal portion 36 to the outside and through a seal ring 25 and a space 35 from a seal portion 37 to the outside to seal the inner side of the inner shroud 23 from a hot combustion gas. A clearance .delta.H between a stationary portion and a rotary portion changes with a thermal elongation. A clearance measuring sensor 14 monitors the clearance .delta.H without intermission. When the clearance .delta.H is large; the control unit 10 opens the flow regulator valve 11 to cause the air to bypass the cooler 12. When the clearance .delta.H is small, the control unit 10 closes the valve 11 to control the thermal elongation so that the clearance .delta.H may be optimized at all times. As a result, the sealing performance can be improved to avoid the contact.
Mitsubishi Heavy Industries Ltd.
Riches Mckenzie & Herbert Llp
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