F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
277/17, 170/62
F01D 25/00 (2006.01) F01D 11/06 (2006.01) F16J 15/44 (2006.01)
Patent
CA 1039657
Abstract of the Disclosure The control apparatus described is provided for the purpose of utilizing internal seals in the turbo-machinery for the purpose of adding additional stiffness to the shaft to raise the critical speed of the shaft-rotor system. The seals de- scribed are annular in configuration, closely surrounding the shaft of the turbo-machine and located inboard of the bearings supporting the shaft. The seals each include a face having an annular recess formed therein adjacent a radially oriented surface in the turbo-machine housing. A passageway extends through this face into fluid communication with the annular recess. The passageway is connected to a hydraulic system and is provided with a control valve so that the rate of fluid flow through the passage- way can be varied. A small passageway extends through the seal body into the recess. The arrangement is such that fluid acts on one end of the seal body to force the seal face into frictional engagement with the radial face in the housing. The force gener- ated by such fluid is determined by the differential pressure across the seal which is controlled by varying the amount of fluid being discharged through the passageway. Since the seal closely encircles the shaft, the frictional force between the face of the seal and the radial face on the housing tends to oppose any lateral movement of the shaft and thus add additional stiffness to the shaft.
239311
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