Title (en)

HEAT EXCHANGERS

Publication

EP 0223534 A3 19890222 (EN)

Application

EP 86308754 A 19861111

Priority

GB 8528806 A 19851122

Abstract (en)

[origin: EP0223534A2] A heat exchanger tube (Figure 9) has an insert to increase the heat exchange surface area made from a strip of metal foil, which is first transversely corrugated, is then modified to provide an outward bulge on each flank of each corrugation, and is then rolled transversely to a generally star shape and inserted axially into the tube. A series of such inserts are posted into the tube one after the other.

IPC 1-7

B21C 37/22; B21D 53/08

IPC 8 full level

B21C 37/22 (2006.01); B21C 37/24 (2006.01); F28F 1/10 (2006.01)

CPC (source: EP)

B21C 37/22 (2013.01); B21C 37/24 (2013.01); F28F 1/105 (2013.01)

Citation (search report)

• [X] US 3158122 A 19641124 - DE GIVE LOUIS P
• [X] US 4163474 A 19790807 - MACDONALD ROBERT D [US], et al
• [XD] US 3831247 A 19740827 - DEGROOTE R
• [A] US 4419802 A 19831213 - RIESE W A [US]
• [A] US 3474513 A 19691028 - ALLINGHAM WILLIAM D
• [A] CH 309256 A 19550831 - ESCHER WYSS AG [CH]

Designated contracting state (EPC)

DE ES FR GB IT NL SE

DOCDB simple family (publication)

EP 0223534 A2 19870527; EP 0223534 A3 19890222; EP 0223534 B1 19911106; DE 3682374 D1 19911212; GB 8528806 D0 19851224

DOCDB simple family (application)

EP 86308754 A 19861111; DE 3682374 T 19861111; GB 8528806 A 19851122