Refrigeration cycle apparatus

Abstract

The inside of a casing constituting an indoor unit of an air-conditioning apparatus is laterally divided by an air passage partition so that an air passage chamber housing an indoor fan and an indoor heat exchanger is defined close to a casing side panel. A space in the casing close to the casing side panel is further vertically divided by a partition having through holes and so that a pipe connection chamber housing parts of the extension pipes, flare joints, and indoor pipes is defined in an upper portion and a pipe draw-out chamber in which the extension pipes are arranged is defined in a lower portion. Gaps between outer peripheries of the extension pipes and inner peripheries of the through holes are filled with insulations.

1 - 8 . (canceled) 
     
     
         9 . A refrigeration cycle apparatus using a flammable refrigerant, the refrigeration cycle apparatus comprising:
 an outdoor unit including at least a compressor and an outdoor pipe;   an indoor unit including at least an indoor heat exchanger and an indoor pipe;   an extension pipe connecting the outdoor pipe and the indoor pipe to each other;   a pipe connection chamber disposed in a casing constituting the indoor unit and housing a connection portion connecting the indoor pipe and the extension pipe;   a pipe draw-out chamber disposed in the casing constituting the indoor unit, the extension pipe drawn out from the pipe connection chamber passing through the pipe draw-out chamber; and   a leakage detection sensor detecting refrigerant leakage disposed in the pipe connection chamber,   the pipe connection chamber and the pipe draw-out chamber being partitioned from each other by a partition having a through hole, the extension pipe penetrating the through hole.   
     
     
         10 . The refrigeration cycle apparatus of  claim 9 , wherein
 the pipe draw-out chamber is divided into a plurality of chambers by one or more additional partitions each having a through hole, the extension pipe penetrating the through hole, and   the extension pipe serially and sequentially passes through the chambers of the pipe draw-out chamber.   
     
     
         11 . The refrigeration cycle apparatus of  claim 9 , wherein
 the through hole in the pipe draw-out chamber is located in an upper portion or a top panel of the casing, the extension pipe penetrating the through hole in the pipe draw-out chamber.   
     
     
         12 . The refrigeration cycle apparatus of  claim 9 , wherein
 the indoor heat exchanger includes a plurality of heat radiation plates spaced from one another, and a heat transmission pipe penetrating the plurality of heat radiation plates in a serpentine manner, and   the pipe connection chamber houses a joint portion jointing the heat transmission pipe and the indoor pipe.   
     
     
         13 . The refrigeration cycle apparatus of  claim 9 , wherein
 the indoor heat exchanger includes a refrigerant channel and a water channel adjacent to each other, and a refrigerant connection portion communicating with the refrigerant channel, and   the pipe connection chamber houses the refrigerant connection portion.   
     
     
         14 . The refrigeration cycle apparatus of  claim 9 , wherein
 the indoor pipe and the extension pipe are connected to each other by a mechanical joint.   
     
     
         15 . The refrigeration cycle apparatus of  claim 9 , wherein
 a gap between an outer periphery of the extension pipe and an inner periphery of the through hole is filled with a gap filler of a closed cell foam material.   
     
     
         16 . The refrigeration cycle apparatus of  claim 9 , wherein
 the refrigerant is one of a single component HFC refrigerant of R32 (CH 2 F 2 : difluoromethane), HFO-1234yf (CF 3 CF═CH 2 : tetrafluoropropene), or HFO-1234ze (CF 3 —CH═CHF), or a mixed refrigerant of these single component refrigerants.