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Mechanical control system for preventing compressor lubrication pump cavitation in a refrigeration system

  • US 4,399,663 A
  • Filed: 11/27/1981
  • Issued: 08/23/1983
  • Est. Priority Date: 11/27/1981
  • Status: Expired due to Fees
First Claim
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1. A control system for preventing oil pump cavitation by controlling flow of vaporous refrigerant to a compressor in a hermetically sealed refrigeration system of the type wherein a lubricating oil reservoir is located in a housing filled with vaporous refrigerant at a pressure proportional to the refrigerant pressure in the refrigeration system evaporator comprising:

  • a reservoir for vaporous refrigerant;

    means for connecting the reservoir to the refrigeration system evaporator;

    means for permitting refrigerant flow from the evaporator to the reservoir when the pressure in the evaporator exceeds the pressure in the reservoir;

    means for controlling the rate of flow of refrigerant from the reservoir to the evaporator when the pressure in the reservoir exceeds the pressure in the evaporator;

    differential pressure sensing means responsive to the difference in pressure between the evaporator and the reservoir; and

    means for controlling the flow of vaporous refrigerant to the compressor from the evaporator in response to the differential pressure sensing means when the differential pressure sensing means senses a predetermined higher pressure in the reservoir than the evaporator.

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