Heat exchanger of heat-source-side unit and heat pump apparatus including the heat exchanger

Abstract

A heat exchanger of a heat-source-side unit includes: a heat exchange unit where heat transfer tube groups, each of which includes a plurality of heat transfer tubes arranged in a vertical direction, are provided in an air passage direction in at least three or more rows; a liquid-side connecting pipe forming an inlet or an outlet for refrigerant in a liquid phase or in a gas-liquid two phase; and a distributor configured to distribute the refrigerant to a plurality of refrigerant flow passages forming the heat exchange unit. In at least two heat transfer tube groups of the heat transfer tube groups of the heat exchange unit, the liquid-side connecting pipe is connected to one end of a heat transfer tube located at least at a lowermost portion of each of the two heat transfer tube groups and the distributor is connected to the other end of the heat transfer tube.

1 . A heat exchanger of a heat-source-side unit, the heat exchanger comprising:
 a heat exchange unit where heat transfer tube groups, each of which includes a plurality of heat transfer tubes arranged in a vertical direction, are provided in an air passage direction in at least three or more rows;   a liquid-side connecting pipe forming an inlet or an outlet for refrigerant in a liquid phase or in a gas-liquid two phase; and   a distributor configured to distribute the refrigerant to a plurality of refrigerant flow passages forming the heat exchange unit, wherein   in at least two heat transfer tube groups of the heat transfer tube groups of the heat exchange unit, the liquid-side connecting pipe is connected to one end of a heat transfer tube located at a lowermost portion of each of the two heat transfer tube groups and the distributor is connected to an other end of the heat transfer tube.   
     
     
         2 . The heat exchanger of the heat-source-side unit of  claim 1 , wherein
 the heat transfer tube groups include a first-row heat transfer tube group, a second-row heat transfer tube group, and a third-row heat transfer tube group arranged in this order from a leeward side in three rows, and   the liquid-side connecting pipe is connected to heat transfer tubes located at lowermost portions of the first-row heat transfer tube group, the second-row heat transfer tube group, and the third-row heat transfer tube group.   
     
     
         3 . The heat exchanger of the heat-source-side unit of  claim 1  , wherein the distributor includes a fine pipe connected with the plurality of refrigerant flow passages forming the heat exchange unit. 
     
     
         4 . A heat pump apparatus including a refrigerant circuit through which refrigerant cycles, the refrigerant circuit being formed by connecting a compressor, a load-side heat exchanger, an expansion mechanism, and the heat exchanger of the heat-source-side unit of  claim 1  in this order by a pipe.