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Method and apparatus for non-atmospheric venting of evaporator over-pressure in a refrigeration system

  • US 5,319,945 A
  • Filed: 06/29/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 06/29/1992
  • Status: Expired due to Fees
First Claim
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1. An evaporator over-pressure control apparatus for use in conjunction with a refrigeration system, the refrigeration system including an evaporator wherein liquid refrigerant is evaporated to refrigerant vapor at an evaporator normal operating pressure, a compressor for pressurizing the refrigerant vapor, a condenser for condensing pressurized refrigerant vapor to liquid refrigerant and an expansion valve interposed between the condenser and the evaporator for reducing the pressure of the liquid refrigerant, the over-pressure control apparatus comprising:

  • (a) sensor means for sensing a system condition and providing a signal representative of the evaporator pressure;

    (b) controller means operably coupled to the sensor means for providing an actuation signal when the signal provided to the controller means by the sensor means signals a vent pressure greater than the normal operating pressure of the evaporator;

    (c) storage means operably coupled to the evaporator for selectively receiving liquid refrigerant from the evaporator; and

    (d) valve means operably coupled to the controller means and the storage means for selectively venting liquid refrigerant from the evaporator to the storage means in response to the actuation signal, whereby liquid refrigerant is vented from the evaporator to the storage vessel when the evaporator pressure reaches said vent pressure.

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