Vehicular air conditioner

Abstract

A vehicular air conditioner in which a plurality of parts comprising a refrigerant circuit are integrally provided to reduce an occupying space and reduce the number of the parts and the number of assembling steps. A refrigerant circuit is provided with a cold storage internal heat exchanger having a high-pressure refrigerant storage unit through which the high-pressure refrigerant on the downstream side of a condenser flows, a low-pressure refrigerant storage unit through which the low-pressure refrigerant on the downstream side of an evaporator flows, and a cold storage material housing unit which houses a cold storage material therein. The cold storage internal heat exchanger exchanges the heat between the high-pressure refrigerant in the high-pressure refrigerant storage unit and the low-pressure refrigerant in the low-pressure refrigerant storage unit, cools the cold storage material stored in the cold storage material housing unit by means of the low-pressure refrigerant in the low-pressure refrigerant storage unit when a compressor is activated, cools the high-pressure refrigerant in the high-pressure refrigerant storage unit by means of the cold storage material housed in the cold storage material housing unit after the heat exchange with the low-pressure refrigerant of the low-pressure refrigerant storage unit, and cools the low-pressure refrigerant in the low-pressure refrigerant storage unit by means of the cold storage material housed in the cold storage material housing unit when the compressor is stopped.

1 . A vehicular air conditioner including a refrigerant circuit having a compressor, a condenser, a decompressor, and an evaporator, comprising:
 a cold storage internal heat exchanger in the refrigerant circuit, the cold storage internal heat exchanger including a high-pressure refrigerant passage through which a high-pressure refrigerant on a downstream side of the condenser flows, a low-pressure refrigerant passage through which a low-pressure refrigerant on a downstream side of the evaporator flows, and a cold storage material housing unit which houses a cold storage material, the cold storage internal heat exchanger exchanging heat between the high-pressure refrigerant in the high-pressure refrigerant passage and the low-pressure refrigerant in the low-pressure refrigerant passage, cooling the cold storage material stored in the cold storage material housing unit by the low-pressure refrigerant in the low-pressure refrigerant passage when the compressor is activated, and cooling the low-pressure refrigerant in the low-pressure refrigerant passage by the cold storage material when the compressor is stopped.   
     
     
         2 . The vehicular air conditioner according to  claim 1 , wherein the cold storage internal heat exchanger is structured to cool the high-pressure refrigerant in the high-pressure refrigerant passage using the cold storage material after heat-exchange with the low-pressure refrigerant in the low-pressure refrigerant passage when the compressor is activated. 
     
     
         3 . The vehicular air conditioner according to  claim 1 , wherein a low-pressure refrigerant storage unit through which the low-pressure refrigerant on the downstream side of the evaporator flows and which can store a predetermined amount of low-pressure refrigerant is provided as the low-pressure refrigerant passage of the cold storage internal heat exchanger, and an outlet for the low-pressure refrigerant in the low-pressure refrigerant storage unit is provided on an upper portion of the low-pressure refrigerant storage unit. 
     
     
         4 . The vehicular air conditioner according to  claim 1 , wherein a high-pressure refrigerant storage unit through which the high-pressure refrigerant on the downstream of the condenser flows and which can store a predetermined amount of high-pressure refrigerant is provided as the high-pressure refrigerant passage of the cold storage internal heat exchanger.