| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and inexpensive heat exchanger of excellent mass productivity not contaminating a fluid flowing in a passage on the other side even if a fluid flowing in a passage on one side leaks. SOLUTION: The heat exchanger wound in loop shape and overlapped in a plurality of stages comprises an outer tube, an intermediate tube integrally formed in the outer tube, and an inner tube fitted to the intermediate tube. A first fluid passage divided into a plurality of passages is formed by a heat transfer wall between the outer tube and the intermediate tube, and a second fluid passage is formed in the inner tube. A plurality of fluid escape grooves provided recessively in the intermediate tube are formed at a fitting face of the inner tube and the intermediate tube. COPYRIGHT: (C)2007,JPO&INPIT
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