Title:
PIPE HAVING GROOVED INNER SURFACE, APPARATUS FOR PRODUCING THE SAME AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2010/067576
Kind Code:
A1
Abstract:
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.
Inventors:
YOON, Youngduk (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
尹栄徳 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
TSURI, Kotaro (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
釣弘太郎 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
尹栄徳 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
TSURI, Kotaro (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
釣弘太郎 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
Application Number:
JP2009/006674
Publication Date:
June 17, 2010
Filing Date:
December 07, 2009
Export Citation:
Assignee:
FURUKAWA ELECTRIC CO., LTD. (2-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 22, 〒1008322, JP)
古河電気工業株式会社 (〒22 東京都千代田区丸の内２丁目２番３号 Tokyo, 〒1008322, JP)
YOON, Youngduk (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
尹栄徳 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
TSURI, Kotaro (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
釣弘太郎 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
古河電気工業株式会社 (〒22 東京都千代田区丸の内２丁目２番３号 Tokyo, 〒1008322, JP)
YOON, Youngduk (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
尹栄徳 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
TSURI, Kotaro (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
釣弘太郎 (〒22 東京都千代田区丸の内２丁目２番３号 古河電気工業株式会社内 Tokyo, 〒1008322, JP)
International Classes:
B21C1/22; B21C3/16
Attorney, Agent or Firm:
NAGATA, Yoshiaki et al. (NAGATA Patent Office, 7th Floor Shiroguchi Bldg. 2-15, Kakuda-cho, Kita-ku, Osaka-sh, Osaka 17, 〒5300017, JP)
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