Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1975-01-06
1976-11-02
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 75, F16J 1548
Patent
active
039892581
ABSTRACT:
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 described 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 passageway 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 generated 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.
REFERENCES:
patent: 2895751 (1959-07-01), Standish
patent: 3179422 (1965-04-01), Phillips
Dresser Industries Inc.
Hazelwood John N.
Smith Robert I.
Van Winkle Roy L.
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