Importance

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Abstract

An intermediate heat exchanger 10 includes a double tube 11 and a liquid reservoir 14. The double tube 11 has an outer tube 15 and an inner tube 16 disposed inside the outer tube 15 with a clearance formed therebetween. The clearance between the outer tube 15 and the inner tube serves as a high-temperature-side refrigerant passage 12, through which refrigerant of high pressure flowing out of a condenser flows, and the interior of the inner tube 16 serves as a low-temperature-side refrigerant passage 13, through which refrigerant of low pressure flowing out of an evaporator flows. The liquid reservoir 14, which communicates with the high-temperature-side refrigerant passage 12 of the double tube 11, stores the refrigerant of high pressure flowing out of the condenser before the pressure of the refrigerant is reduced by a pressure reducer, and separate liquid-phase refrigerant and gas-phase refrigerant. The outer tube 15 of the double tube 11 has a refrigerant inlet 17 and a refrigerant outlet 18 communicating with the high-temperature-side refrigerant passage 12. At an intermediate position between the refrigerant inlet 17 and the refrigerant outlet 18, refrigerant flows from the high-temperature-side refrigerant passage 12 of the double tube 11 into the liquid reservoir 14, and returns from the liquid reservoir 14 to the high-temperature-side refrigerant passage 12.

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First Claim