Heat transfer pipe

Details Heat transfer pipe Heat transfer pipe

1983-09-02

1985-10-29

Cline, William R.

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

165184, F28F 142

Patent

active

045496064

ABSTRACT:
A heat transfer pipe including a cylindrical heat transfer pipe body and a plurality of circumferential or spiral fins integrally formed on the outer surface of the pipe body, the upper portion of each of the fins having one or more circumferential grooves to divide it circumferencially into at least two parts and a plurality of axially extending breaks to divide it axially into a number of parts. The fins further may have notches formed therein with a predetermined pitch in a direction crossing the fins to divide them into a plurality sections, and a plurality of discrete beads are integrally formed on the inner surface of the body along imaginary lines having a lead angle which is in reverse relation to the lead angle of the fins, the beads being formed on at least some of the intersections between the imaginary lines and the fins.

REFERENCES:
patent: 3326283 (1967-06-01), Ware
patent: 4159739 (1979-07-01), Brothers et al.
patent: 4166498 (1979-09-01), Fujie et al.
patent: 4330036 (1982-05-01), Satoh et al.

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