Tube-hole structure for expanded tube-to-tube-sheet joint

Details Tube-hole structure for expanded tube-to-tube-sheet joint Tube-hole structure for expanded tube-to-tube-sheet joint

1977-03-30

1979-03-06

Myhre, Charles J.

Heat exchange

Side-by-side tubular structures or tube sections

With manifold type header or header plate

291574, 29523, 285222, 2853824, F28F 916, F16L 4100

Patent

active

041425812

ABSTRACT:
A tube-hole structure for an expanded tube-to-tube-sheet joint which is formed by axially moving a rod within each tube member in each tube hole of the tube sheet by external drive means, thereby imparting an elastic mass placed inside the tube with a sufficient compressive load to expand the tube uniformly in the radial direction to provide a rigid joint between the tube and tube hole, characterized in that each tube hole has at least one circumferential groove with an axial dimension or length of 1.5/.beta. to 3.0/.beta. (.beta. being ##EQU1## WHERE R is the mean radius of the tube member to be expanded, t is the wall thickness of the tube, and .nu. is the Poisson's ratio).

REFERENCES:
patent: 2080374 (1937-05-01), McAllister
patent: 3428338 (1969-02-01), Corwin
patent: 3710434 (1973-01-01), Daniels et al.
patent: 3717925 (1973-02-01), Hardwick
patent: 3982778 (1976-09-01), Spencer et al.

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