HEAT TRANSFER TUBE WITH INTERNAL GROOVES AND METHOD AND DEVICE FOR MANUFACTURING THE TUBE

Title:

HEAT TRANSFER TUBE WITH INTERNAL GROOVES AND METHOD AND DEVICE FOR MANUFACTURING THE TUBE

Document Type and Number:

WIPO Patent Application WO/2000/062001

Kind Code:

A1

Abstract:

A heat transfer tube with internal grooves, wherein multiple rows of V-shaped streaky grooves (3), (3) --- are formed in the inner peripheral surface (2) of a tube main body (1a) symmetrically with respect to the axial direction of the tube and secondary grooves (6), (6), ---, (7), (7) --- of a specified depth are formed in a part of projected streaky parts (5), (5), --- formed between the V-shaped streaky grooves to reduce a pressure loss, and the width of the multiple rows of the V-shaped streaky grooves (3), (3), --- in circumferential direction is differentiated from each other to produce a swirl component in spiral direction, whereby the flow of refrigerant in the tube can be controlled properly even when a refrigerant flow rate is small to increase a heat transfer performance as large as possible.

Inventors:

FUJINO HIROKAZU (JP)
KASAI KAZUSHIGE (JP)
AKAI KANJI (JP)
OKAMOTO NORIAKI (JP)
UCHIMITSU MASARU (JP)

Application Number:

PCT/JP2000/002300

Publication Date:

October 19, 2000

Filing Date:

April 10, 2000

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
FUJINO HIROKAZU (JP)
KASAI KAZUSHIGE (JP)
AKAI KANJI (JP)
OKAMOTO NORIAKI (JP)
UCHIMITSU MASARU (JP)

International Classes:

B21C37/08; B21C37/20; F28F1/40; (IPC1-7): F28F1/40; B21D5/12

Foreign References:

JPH1047880A	1998-02-20
JPH10206060A	1998-08-07
JPS5560089U	1980-04-23
JPH1183368A	1999-03-26
JPH02165875A	1990-06-26
JPH04339530A	1992-11-26
JPH1190530A	1999-04-06
JPH04288197A	1992-10-13

Other References: