Title:
HEAT TRANSFER DOUBLE TUBE, INNER TUBE FOR HEAT TRANSFER DOUBLE TUBE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/079877
Kind Code:
A1
Abstract:
An inner tube (2) used in a heat transfer double tube for exchanging heat between a fluid flowing on the inner side of the inner tube (2), which is positioned inside an outer tube, and a fluid flowing between the inner tube (2) and the outer tube. The inner tube (2) has a first region (21) and a second region that differ in cross-sectional shape. The first region (21) has a recessed/protruding configuration in which outwardly projecting first protrusions (211) are provided in a plurality of locations, and the protrusions (211) are positionally displaced in the form of a spiral in the longitudinal direction. The second region has a second recessed/protruding configuration in which outwardly projecting second convex protrusions are provided in a plurality of locations, there being more second protrusions than first protrusions, and the second protrusions are positionally displaced in the form of a spiral in the longitudinal direction.
Inventors:
KATAHIRA SHIRO (JP)
NAKAMURA TAKURO (JP)
NAKAMURA TAKURO (JP)
Application Number:
PCT/JP2020/039392
Publication Date:
April 29, 2021
Filing Date:
October 20, 2020
Export Citation:
Assignee:
UACJ CORP (JP)
International Classes:
F28D7/10; F28F1/06; F28F1/42
Foreign References:
| JPS5737690A | 1982-03-02 | |||
| JP2004190923A | 2004-07-08 | |||
| JP2002318015A | 2002-10-31 | |||
| JP2006162241A | 2006-06-22 | |||
| JP2013113525A | 2013-06-10 |
Other References:
See also references of EP 4006475A4
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)
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