MANUFACTURE OF COMPOSITE HEAT TRANSFER PIPE

PROBLEM TO BE SOLVED: To easily and inexpensively obtain a composite heat transfer pipe whose core twisted at given pitches is accurately and closely attached to an outer pipe over the whole circumference. SOLUTION: In a manufacturing method of a composite heat transfer pipe, a twisted core 2 shorte...

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Bibliographic Details
Main Authors NAKAJIMA KAZU, FUTAMURA SATOSHI
Format Patent
LanguageEnglish
Published 27.07.1999
Edition6
Subjects
BLASTING
DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION
HEAT EXCHANGE IN GENERAL
HEATING
LIGHTING
MECHANICAL ENGINEERING
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
PERFORMING OPERATIONS
PUNCHING METAL
TRANSPORTING
WEAPONS
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Summary:PROBLEM TO BE SOLVED: To easily and inexpensively obtain a composite heat transfer pipe whose core twisted at given pitches is accurately and closely attached to an outer pipe over the whole circumference. SOLUTION: In a manufacturing method of a composite heat transfer pipe, a twisted core 2 shorter than an outer pipe 1 is inserted therein, a grip part A free from any core is provided on each end of the outer pipe 1, the grip parts A are held by chucks and pulled to contract the diameter of the outer pipe 1, and the inner surface of the outer pipe 1 is closely attached to the outermost circumference of the core 2 over the whole circumference and length. The outer pipe 1 is preferably extended by 4-8% in the longitudinal direction.
Bibliography:Application Number: JP19980017976