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Refrigeration cycle device

  • US 10,451,317 B2
  • Filed: 12/08/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 12/25/2014
  • Status: Active Grant
First Claim
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1. A refrigeration cycle device comprising:

  • a compressor that draws, compresses, and discharges a refrigerant;

    a heat dissipation device that dissipates heat held in the refrigerant discharged from the compressor, into a ventilation air which is to be blown into a space to be air-conditioned;

    a first decompression portion that decompresses the refrigerant flowing out of the heat dissipation device;

    an exterior heat exchanger that exchanges heat between the refrigerant flowing out of the first decompression portion and outside air;

    a gas-liquid separator that separates the refrigerant flowing out of the exterior heat exchanger into a gas-phase refrigerant and a liquid-phase refrigerant, the gas-liquid separator having a gas-phase refrigerant outlet from which the gas-phase refrigerant flows and a liquid-phase refrigerant outlet from which the liquid-phase refrigerant flows;

    a second decompression portion that decompresses the refrigerant flowing out of the liquid-phase refrigerant outlet of the gas-liquid separator;

    an evaporator that evaporates the refrigerant by exchanging heat between the refrigerant flowing out of the second decompression portion and the ventilation air;

    a switching device configured to be selectively switchable between a first refrigerant circuit and a second refrigerant circuit, wherein the first refrigerant circuit is configured to cause the refrigerant discharged from the compressor to flow into the gas-liquid separator while flowing out of the liquid-phase refrigerant outlet of the gas-liquid separator and then to cause the refrigerant from the liquid-phase refrigerant outlet to flow sequentially into the second decompression portion and the evaporator to be drawn into the compressor, and the second refrigerant circuit is configured to cause the refrigerant discharged from the compressor to flow into the gas-liquid separator while flowing out of the gas-phase refrigerant outlet of the gas-liquid separator, and then to cause the refrigerant from the gas-phase refrigerant outlet to be drawn into the compressor; and

    an oil separator provided in a refrigerant passage from the compressor to the exterior heat exchanger, the oil separator being configured to separate oil from the refrigerant containing the oil and flowing into the oil separator from a refrigerant-flow upstream side of the oil separator and then to cause the refrigerant after the separation to flow out toward a refrigerant-flow downstream side of the oil separator, while retaining the oil when the first refrigerant circuit is set, whereinthe oil separator includes a tank forming an oil reservoir space that retains the oil separated from the refrigerant, a refrigerant inlet portion through which the refrigerant flows from the refrigerant-flow upstream side of the oil separator into the oil reservoir space, and a refrigerant outlet portion that causes the refrigerant within the oil reservoir space to flow out toward the refrigerant-flow downstream side of the oil separator, wherein the oil separator is provided downstream the heat dissipation device and upstream the first decompression portion in the refrigerant passage from the compressor to the exterior heat exchanger, andwherein the refrigeration device is configured such that when the second circuit is circulating refrigerant, the refrigerant in the gas liquid separator flows out of the gas-phase refrigerant outlet without flowing out of the liquid-phase refrigerant outlet, and the liquid-phase refrigerant after condensation in the heat dissipation device flows into the tank of the oil separator.

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