EP 1555502 A2 20050720 - Tube insertion structure of a heat exchanger
Title (en)
Tube insertion structure of a heat exchanger
Title (de)
Struktur zum Einbringen von Wärmeaustauschrohren
Title (fr)
Structure d'insertion de tubes d'échangeur de chaleur
Publication
Application
Priority
JP 2004009665 A 20040116
Abstract (en)
A tube insertion structure of a heat exchanger includes a header tank (120) having a tube hole (121a), and a tube (111) having a rectangular cross-section inserted in the tube hole (121a) at a longitudinal end (111a) with an abutment portion (131) of the tube (111) brazed to the tank (120). A narrow side (111b) of the rectangular flat section of the tube (111) is expanded outwardly into a protruding arc shape in close proximity of the abutment portion (131) of the tube (111). The arc shape on the narrow side of the tube is formed simultaneously in a mouth of the tube (111) expansion process. In this manner, a durable rooted structure near the tube insertion portion of a heat exchanger with reduced suction friction of fluid flowing in the tube (111) is provided. <IMAGE>
IPC 1-7
IPC 8 full level
F28D 1/053 (2006.01); F28F 9/18 (2006.01)
CPC (source: EP)
B21D 41/02 (2013.01); B21D 53/085 (2013.01); F28D 1/05366 (2013.01); F28F 9/182 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 05000483 A 20050112; JP 2004009665 A 20040116