Heat transfer tube with cross-grooved inner surface and manufact

Details Heat transfer tube with cross-grooved inner surface and manufact Heat transfer tube with cross-grooved inner surface and manufact

1997-09-11

2000-02-22

Leo, Leonard

Heat exchange

With coated, roughened or polished surface

165184, F28F 140

Patent

active

060268921

ABSTRACT:
A heat transfer tube with a cross-grooved inner surface used in refrigerators, air conditioners or the like and a manufacturing method thereof are disclosed. The heat transfer tube is formed in such a manner that the helix angle .alpha. of a primary spiral groove to the longitudinal axis of the tube is in the range of 10.degree. to 40.degree., the intersecting angle .beta. of a secondary groove to the primary spiral groove is in the range of 75.degree. to 105.degree., the ratio H/Hf of a height H of the secondary groove to a height Hf of the primary spiral groove is in the range of 0.5 to 1.0, the slope angle .gamma..sub.1 of an upstream slant face is in the range of 90.degree. to 105.degree. to the direction of the primary spiral groove, the slope angle .gamma..sub.2 of a downstream slant face is in the range of 30.degree. to 60.degree. to the direction of the primary spiral groove, and the ratio A/B of a width A of an upper surface of the ridge formed between the primary and secondary grooves to a width B of an upper opening portion of the secondary groove is in the range of 0.2 to 1.0.

REFERENCES:
patent: 4733698 (1988-03-01), Sato
patent: 4809415 (1989-03-01), Okayama et al.
patent: 5052476 (1991-10-01), Sukumoda et al.
patent: 5332034 (1994-07-01), Chiang et al.

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