Title:
HEAT EXCHANGER FINS AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPH0545085
Kind Code:
A
Abstract:
PURPOSE: To obtain heat exchanger fins capable of absorbing work strains accumulated in a metallic sheet and holding the strength of the metallic sheet without highly hardening the metallic sheet.
CONSTITUTION: A row or rows of penetration holes which comprise penetration holes 16 bored at a fixed span are formed in the longitudinal direction of a squared strip-like metallic sheet 11 serving as heat exchanger fins. Each of the penetration holes 16 is a collared penetration hole 12 whose peripheral edge is surrounded by a collar 17 at a specified height. There are intermittently formed grooves 20 near both ends of the metallic sheet 10 along the longitudinal direction of the metallic sheet.
Inventors:
NISHIKAWA YOSHIJI
Application Number:
JP22460591A
Publication Date:
February 23, 1993
Filing Date:
August 09, 1991
Export Citation:
Assignee:
HIDAKA SEIKI KK
International Classes:
B21D17/00; B21D19/00; B21D28/24; B21D53/02; F28F1/32; (IPC1-7): B21D17/00; B21D19/00; B21D28/24; B21D53/02; F28F1/32
Domestic Patent References:
| JPH03113294A | 1991-05-14 |
Attorney, Agent or Firm:
Takao Watanuki (1 outside)
Next Patent: MULTITUBE COIL TYPE HEAT EXCHANGER