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US 2006/0222510 A1Published application
Prevention of unpowered reverse rotation in compressors
AssigneeCarrier Corporation
InventorsAlexander Lifson, Michael Taras
Life of this patent
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AssigneeCarrier Corporation
InventorsAlexander Lifson, Michael Taras
Estimating the term…
The shutdown of a compressor (10) installed in a refrigerant circuit (2) in air conditioning or refrigeration system is controlled so as to prevent unpowered reverse rotation of the compressor. Prior to terminating electric power to the compressor drive motor (24), the pressure within the system is relieved and substantially equalized across the compressor, thereby eliminating the possibility of unpowered reverse rotation of the compressor at shutdown. Pressure relief and equalization may be achieved by reducing the operating speed of the compressor to a low forward speed for a period of time prior to deenergizing the compressor drive motor. Pressure equalization may also be achieved by driving the compressor in reverse rotation prior to deenergizing the drive motor.
A method of operating a compressor for a controlled shutdown, the compressor having a drive shaft operatively associated with a compression mechanism having a compression chamber wherein a fluid is compressed from a suction pressure to a discharge pressure upon rotation of the drive shaft, and a drive motor operatively associated with the drive shaft for driving the drive shaft at a rotational speed, said method comprising controlling rotation of the drive shaft to substantially equalize the discharge pressure to the suction pressure prior to deenergizing the drive motor.
A compressor comprising:
A compressor comprising:
Dependencies are inferred from the claim text.