Double-pipe heat exchanger and air conditioner using same

Abstract

A double-pipe heat exchanger capable of achieving a compact configuration and suppressing a liquid refrigerant contained in a gas-liquid two-phase refrigerant from flowing out from an inner pipe so as to prevent generation of a liquid-back phenomenon is provided. A double-pipe heat exchanger includes an outer pipe through which a high pressure liquid refrigerant flows, and an inner pipe having an inlet side end into which a low pressure gas-liquid two-phase refrigerant obtained by reducing pressure of the high pressure liquid refrigerant flows, and an outlet side end connected to a suction side part of a compressor. The double-pipe heat exchanger includes a plurality of vertical pipes arranged in the up and down direction, and a curve pipe connecting ends of the plurality of vertical pipe), the outlet side end of the inner pipe is provided in an upper end of one vertical pipe, and the inlet side end of the inner pipe is provided in an upper end of the other vertical pipe.

1 . A double-pipe heat exchanger comprising:
 an outer pipe through which a high pressure liquid refrigerant flows; and   an inner pipe having an inlet side end into which a low pressure gas-liquid two-phase refrigerant obtained by reducing pressure of the high pressure liquid refrigerant flows, and an outlet side end connected to a suction side part of a compressor, wherein   the double-pipe heat exchanger includes a plurality of vertical pipes arranged in the up and down direction, and a curve pipe connecting ends of the plurality of vertical pipes,   the outlet side end of the inner pipe is provided in an upper end of one vertical pipe, and   the inlet side end of the inner pipe is provided in an upper end of the other vertical pipe.   
     
     
         2 . The double-pipe heat exchanger according to  claim 1 , wherein
 the two vertical pipes are provided, and lower ends of the vertical pipes are connected by the curve pipe.   
     
     
         3 . An air conditioner comprising:
 a compressor;   a condenser for condensing a high pressure gas refrigerant compressed by the compressor;   a pressure reduction mechanism for reducing pressure of the condensed high pressure liquid refrigerant;   an evaporator for evaporating the low pressure refrigerant after pressure reduction; and   the double-pipe heat exchanger according to  claim 1 , the double-pipe heat exchanger for supercooling the high pressure liquid refrigerant condensed by the condenser before reducing the pressure of the refrigerant by the pressure reduction mechanism.   
     
     
         4 . The air conditioner according to  claim 3 , wherein
 the curve pipe connected to lower ends of the plurality of vertical pipes in the double-pipe heat exchanger is supported on a bottom frame of a casing in the air conditioner via a support member.   
     
     
         5 . An air conditioner comprising:
 a compressor;   a condenser for condensing a high pressure gas refrigerant compressed by the compressor;   a pressure reduction mechanism for reducing pressure of the condensed high pressure liquid refrigerant;   an evaporator for evaporating the low pressure refrigerant after pressure reduction; and   the double-pipe heat exchanger according to  claim 2 , the double-pipe heat exchanger for supercooling the high pressure liquid refrigerant condensed by the condenser before reducing the pressure of the refrigerant by the pressure reduction mechanism.