PIPE HAVING GROOVED INNER SURFACE, APPARATUS FOR PRODUCING THE SAME AND METHOD FOR PRODUCING THE SAME

WIPO Patent Application WO/2010/067576

A1

Provided is a pipe having a grooved inner surface, which has excellent thermal conduction properties, can be made compact and lightweight, and allows resources to be conserved. Also provided are a method and apparatus for producing this pipe having a grooved inner surface, which allow efficient and stable production thereof. The apparatus which is used for producing the pipe having a grooved inner surface is provided with: diameter-reducing means for drawing a base pipe in order to reduce the diameter thereof, and groove-forming means for forming a large number of grooves on the inner surface of the base pipe. If, for example, the angle of twist of a groove with respect to the centre axis of the pipe is β (º) and the apex angle of a fin which is formed between adjacent grooves is α (º), then β is between 30 and 60 and α is between 5 and 20. If the outer diameter is D (mm), the groove depth is H (mm), and the cross-sectional area with respect to the axial direction of the pipe is Ac (mm2), then D is no greater than 6, H is at least 0.07, and Ac < 0.8 × D.

YOON YOUNGDUK (JP)
TSURI KOTARO (JP)
HASHIZUME TOSHIAKI (JP)
SHOBUKE KAZUAKI (JP)

PCT/JP2009/006674

June 17, 2010

December 07, 2009

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FURUKAWA ELECTRIC CO LTD (JP)
YOON YOUNGDUK (JP)
TSURI KOTARO (JP)
HASHIZUME TOSHIAKI (JP)
SHOBUKE KAZUAKI (JP)
TAGUCHI TADASHI (JP)

B21C1/22; B21C3/16

JP2005207670A	2005-08-04
JP2008087004A	2008-04-17
JP2008036640A	2008-02-21

NAGATA, Yoshiaki et al. (JP)
Yoshiaki Nagata (JP)

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