Hydrodynamic bearing protection system and method

Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...

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417 32, 417 45, 417 53, 62505, 384448, 384100, F04D 2700

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active

050661973

ABSTRACT:
A protection system for a rotatable element (20) which is rotatably supported by hydrodynamic bearings (22, 24) pressurized with a lubricating fluid provided from a pressure source (26 and/or 34) with the fluid being subject to a change in state from liquid to vapor when heat from the bearings during rotation of the rotatable element is absorbed by the pressurized fluid during supporting of the rotatable element in accordance with the invention includes a pressure sensor (302) in fluid communication with fluid flowing from the hydrodynamic bearings for producing a pressure signal representative of pressure of the fluid flowing from the bearings; a temperature sensor (304) in fluid communication with the fluid flowing from the hydrodynamic bearings from producing a temperature signal representative of temperature of the fluid flowing from the bearings; a prime mover (17) for driving the rotatable element with a variable rotational velocity; and a controller (400), responsive to the pressure and temperature signals, for controlling the rotational velocity of the prime mover as a function of the pressure and temperature signals to prevent the change in state of the fluid flowing from the bearings from liquid to vapor.

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"A New Technology in Energy-Efficient Electrically Driven Aircraft Environmental Control Systems", authored by W. Cloud, J. McNamara and David B. Wigmore, presented at the 21st IECEC Conference, Aug. 25-29, 1986, Article #869390 American Chemical Society, pp. 1696-1702.

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