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Method and apparatus for controlling the operation of a centrifugal compressor in a refrigeration system

  • US 4,404,812 A
  • Filed: 11/27/1981
  • Issued: 09/20/1983
  • Est. Priority Date: 11/27/1981
  • Status: Expired due to Fees
First Claim
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1. A compressor control for use in vapor compression refrigeration system for controlling the operation of a hermetic centrifugal compressor having a transmission enclosed in a housing said housing having an oil reservoir for lubricating the transmission and an atmosphere of refrigerant, said control comprising:

  • means to equalize the pressure between the compressor suction and the atmosphere of refrigerant in the housing,means to detect a pressure differential between the compressor suction and the housing before equalization of the pressure in the housing occurs, andmeans to throttle the suction to the compressor upon the detection of a predetermined pressure differential between the compressor suction and the housing.

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