| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat transfer pipe for condenser capable of obtaining superior heat transfer performance even when using a refrigerant corresponding to fleon regulation. SOLUTION: This heat transfer pipe has a fin 1 arranged on an outside surface of a pipe body 3, and extending in the orthogonal or inclined direction to the pipe axis, and a rib 7 formed on an inside surface. The fin 1 has a plurality of first grooves 5 formed by dividing the top thereof in the direction parallel to the fin, and a plurality of second grooves 2 for dividing the fin 1 in the lengthwise direction, and an angleθ<SB>1</SB>formed by a side surface of the second grooves is 55°or less. A pipe circumferential directional pitch P<SB>1</SB>(a straight line distance of the groove bottom) of the second grooves 2 is 0.15 to 0.71 mm. When the depth of the second grooves 2 is set to h<SB>1</SB>, and the height of the fin 1 is set to h<SB>2</SB>, the ratio h<SB>1</SB>/h<SB>2</SB>of h<SB>1</SB>to h<SB>2</SB>is 0.11 to 0.72. The rib 7 extends in a spiral shape by inclining in the pipe axis direction, and its lead angleθ<SB>2</SB>is 42 to 48°. The rib 7 is 1.6 to 4.0 mm in a pitch P<SB>2</SB>in a cross section parallel to the pipe axis direction. COPYRIGHT: (C)2004,JPO
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