Title:
HEAT TRANSFER TUBE WITH INNER SURFACE GROOVE
Document Type and Number:
Japanese Patent JP3286171
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To permit the obtaining of a high heat exchanging performance even under the condition of energy saving operation, in which the flow rate of refrigerant is small.
SOLUTION: A heat transfer tube with inner surface groove is made by a method wherein a plurality of grooves are formed on one side of the strip of a metallic sheet through rolling and a tube is formed so as to keep the surface, on which the grooves are formed, at the inside, then, the abutted ends are connected through welding. Two kinds of groove groups 1, 2 having different pitches in the circumferential direction of the tube, having different twisting directions or having different twisting angles are arranged alternately in areas having different widths W1, W2 in the circumferential direction of the tube. Further, the grooves having small twisting angle are formed on the area having wide width. When the width of the wider area is represented by a notation W1 and that of the narrower area is represented by another notation W2, it is specified that W1/W2=1.1-3.0. On the other hand, the smaller twisting angle is 40-20° and the larger twisting angle is 15-90°.
Inventors:
Mamoru Ishikawa
Kiyonori Kozeki
Nobuaki Hinako
Masataka Noguchi
Kiyonori Kozeki
Nobuaki Hinako
Masataka Noguchi
Application Number:
JP20724896A
Publication Date:
May 27, 2002
Filing Date:
August 06, 1996
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
F28F1/40; B21D53/06; (IPC1-7): F28F1/40; B21D53/06
Domestic Patent References:
| JP250086A | ||||
| JP452497A | ||||
| JP4283397A | ||||
| JP4158193A | ||||
| JP313796A |
Attorney, Agent or Firm:
Masanori Fujimaki
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