METHOD FOR MANUFACTURING DOUBLE-PIPE HEAT EXCHANGER

Title:

METHOD FOR MANUFACTURING DOUBLE-PIPE HEAT EXCHANGER

Document Type and Number:

WIPO Patent Application WO/2021/090526

Kind Code:

A1

Abstract:

The present invention comprises an inner-pipe insertion step for inserting an inner pipe 3 between a core 1 and a metal movable claw 2, a designated-section wave-shaped-part formation step for forming a wave-shaped part 3h (3a) in a first designated section 3a of the inner pipe 3 by pressing the first designated section 3a radially inward to cause the first designated section 3a to plastically deform, a movable claw movement step for causing the metal movable claw 2 to move in the radially outward direction of the inner pipe 3, and an inner pipe movement step for causing a second designated section 3b serving as a subsequent designated section to move between the core 1 and the metal movable claw 2.

Inventors:

MAEDA RYUICHI (JP)
YAGI TAKASHI (JP)
MORI KOICHI (JP)

Application Number:

PCT/JP2020/019822

Publication Date:

May 14, 2021

Filing Date:

May 19, 2020

Export Citation:

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Assignee:

NICHIRIN CO LTD (JP)

International Classes:

B21D53/06; B21D53/08; F28D7/10; F28F1/42

Domestic Patent References:

WO2012000490A2

2012-01-05

Foreign References:

JP2005144459A	2005-06-09
JPS6376715A	1988-04-07
JPS4834663B1	1973-10-23
JP4628858B2	2011-02-09

Other References: