Indoor unit for air-conditioning apparatus and air-conditioning apparatus

Abstract

An indoor unit for an air-conditioning unit that can prevent dew condensation on an air-flow-direction control plate in a vicinity of a heat exchanger, and includes a casing, an air inlet on the casing, an air outlet opening in a bottom surface of the casing, a heat exchanger in an air passage extending from the air inlet to the air outlet, a fan on a windward side of the heat exchanger in the air passage, and an air -flow-direction control plate in the air passage between the heat exchanger and the air outlet. The heat exchanger includes a plurality of heat exchanger blocks arranged in a front-and-rear direction of the casing, and includes a refrigerant inlet through which refrigerant flows into the heat exchanger, and a refrigerant outlet through which the refrigerant flows out of the heat exchanger. The air-flow-direction control plate is provided in the vicinity of one of the heat exchanger blocks, the refrigerant outlet is provided in a heat exchanger block other than the heat exchanger block provided in the vicinity of the air-flow-direction control plate, and the number of refrigerant outlets is larger than the number of refrigerant inlets.

1 . An indoor unit for an air-conditioning apparatus comprising:
 a casing;   an air inlet provided on the casing;   an air outlet opening in a bottom surface of the casing;   a heat exchanger arranged in an air passage extending from the air inlet to the air outlet;   a fan arranged on a windward side of the heat exchanger in the air passage; and   an air-flow-direction control plate provided in the air passage between the heat exchanger and the air outlet,   wherein the heat exchanger comprises a plurality of heat exchanger blocks that are arranged in a front-and-rear direction of the casing, and the heat exchanger include:
 a refrigerant inlet through which refrigerant flows into the heat exchanger; and 
 a refrigerant outlet through which the refrigerant flows out of the heat exchanger, 
   the air-flow-direction control plate is provided in the air passage into which air that has passed through a first heat exchanger block without the refrigerant outlet among the plurality of heat exchanger blocks flows.   
     
     
         2 . The indoor unit for an air-conditioning apparatus of  claim 1 , wherein
 the air passage branches off into a plurality of divided air passages on a downstream side of the heat exchanger,   air that has passed through the first heat exchanger block flows into a first divided air passage that is one of the plurality of divided air passages, and   the air-flow-direction control plate is disposed in the first divided air passage.   
     
     
         3 . The indoor unit for an air-conditioning apparatus of  claim 1 , wherein
 the refrigerant inlet and the refrigerant outlet are provided in a heat exchanger block closest to a rear air passage wall.   
     
     
         4 . The indoor unit for an air-conditioning apparatus of  claim 1 , wherein
 the heat exchanger includes:
 a converging portion, at which at least part of the refrigerant flow passages in which the branched refrigerant flows is converged with the refrigerant flow passage extending from the refrigerant inlet to the refrigerant outlet; and 
 a bifurcation portion provided on a downstream side of a flow of the refrigerant relative to the converging portion, at which the refrigerant branches off into refrigerant flow passages again and the number of the refrigerant flow passages being greater than or equal to the number of the refrigerant flow passages before the convergence. 
   
     
     
         5 . The indoor unit for an air-conditioning apparatus of  claim 1 , wherein
 the heat exchanger block includes:
 an auxiliary heat exchange portion and a primary heat exchange portion; and 
   the auxiliary heat exchange portion is arranged so as to be overlapped with a windward side of the primary heat exchange portion in the air passage,   the refrigerant inlet is provided in the auxiliary heat exchange portion, and   the refrigerant outlet is provided in the primary heat exchange portion.   
     
     
         6 . The indoor unit for an air-conditioning apparatus of  claim 1 , further comprising:
 a detector configured to detect a dry state of the refrigerant in the refrigerant outlet.   
     
     
         7 . An air-conditioning apparatus, comprising:
 an outdoor unit for an air-conditioning apparatus that includes a compressor configured to compress refrigerant; and   the indoor unit for an air-conditioning apparatus of  claim 1 ,   wherein a refrigeration cycle in which the refrigerant circulates between the outdoor unit and the indoor unit is constituted.   
     
     
         8 . The indoor unit for an air-conditioning apparatus of  claim 1 , wherein the air -flow-direction control plate is provided in a vicinity of the first heat exchanger block.