| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger between refrigerants capable of increasing heat exchange amount by increasing the number of processes for performing heat exchange and of suppressing vibration and noise by improving the strength of piping with small diameter arranged within piping with large diameter. SOLUTION: The heat exchanger 4 between refrigerants includes: a cylindrical outer pipe 10; a plurality of inner pipes 12 arranged to penetrate through the outer pipe 10; and a central pipe 13 jointed to the outer peripheral faces of the inner pipes 12 and having an inflow port 13a opened within the outer pipe 10 and an outflow port 13b led out to outside of the outer pipe 10. A high temperature refrigerant made to flow into the outer pipe 10 is cooled by heat exchange with a low temperature refrigerant made to flow in the same direction within the inner pipes 12. Then, the high temperature refrigerant is made to flow in to the central pipe 13 by inverting the direction, performs heat exchange again with the low temperature refrigerant made to flow in the reverse direction within the inner pipes 12, and is made to flow out from the outflow port 13b. COPYRIGHT: (C)2010,JPO&INPIT
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