Piping structure with inner heat exchanger and refrigeration cycle device having the same

Abstract

A piping structure for a refrigerant cycle device includes an inner heat exchanger, and a bypass pipe through which refrigerant flows while bypassing the inner heat exchanger. The inner heat exchanger has a first flow passage in which high-pressure refrigerant before being decompressed flows and a second flow passage in which low-pressure refrigerant after being decompressed flows. The refrigerant cycle device includes plural low-pressure side heat exchangers, and the plural low-pressure side heat exchangers are located such that refrigerant from a part of the low-pressure side heat exchangers flows through the second flow passage of the inner heat exchanger, and refrigerant from the other part of the low-pressure side heat exchangers flows through the bypass pipe while bypassing the inner heat exchanger.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on Japanese Patent Application No. 2006-124740 filed on Apr. 28, 2006, the contents of which are incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a piping structure with an inner heat exchanger and a refrigeration cycle device provided with the same.[0004]2. Description of the Related Art[0005]Piping for a refrigeration cycle device for a vehicle air conditioner has been known as a piping structure provided with an inner heat exchanger. This piping for a refrigeration cycle device has a double pipe structure as an inner heat exchanger, as described in JP-A-2001-277842 (corresponding to U.S. Pat. No. 6,866,090), for example. The double pipe structure has a high-pressure refrigerant pipe extending from a compressor to an evaporator via a condenser and a low-pressure refrigerant pipe extending from the evaporator to the c...

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Benefits of technology

[0008]In view of the foregoing problems, it is an object of the present invention to provide a piping structure an

Problems solved by technology

However, in an air conditioner for a vehicle (dual air conditioner) provided with the plural evaporators, for example, for a front seat and a rear seat, when a low-pressure refrigerant pipe from each of the evaporators is made to communicate with a low-pressure refrigerant pipe of a double pipe part, there is presented a problem that a pressure loss in the low-pressure refrigerant pipe of the double pipe part increases depending on the shape of the double pipe part thereby decreasing a cooling capacity.

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