Trailer refrigerating apparatus

  • US 9,134,058 B2
  • Filed: 06/03/2010
  • Issued: 09/15/2015
  • Est. Priority Date: 06/05/2009
  • Status: Expired due to Fees
First Claim
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1. A trailer refrigerating apparatus for cooling an in-compartment space of a trailer, comprising:

  • a refrigerant circuit which includes an electric compressor, a condenser, an expansion mechanism, an evaporator, a hot gas introduction path connecting the electric compressor and the evaporator together, and a switching valve for controlling a flow of refrigerant in the hot gas introduction path, and which allows a refrigerating cycle for evaporating refrigerant in the evaporator to cool the in-compartment space and a defrosting cycle for introducing refrigerant into the evaporator through the hot gas introduction path to defrost the evaporator;

    a generator configured to supply power to the electric compressor;

    an engine configured to drive the generator;

    a radiator configured to dissipate heat of the engine; and

    a fan,wherein the apparatus performs the defrosting cycle by detecting a pressure of the condenser and controlling the fan according to the following operations based on the detected pressure of the condenser;

    a first operation that counteracts the detected pressure of the condenser being equal to or lower than a predetermined threshold by rotating in a direction so as to form an air flow from the radiator to the condenser, anda second operation that responds to the detected pressure of the condenser becoming higher than said predetermined threshold by stopping the fan.

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