US1774231A - Means for producing heat-transfer conduits - Google Patents

Description

26, 1930; A; E. HARNSBERGER I 1,774,231

MEANS FOR PRODUCING HEAT TRANSFER CONDUITS Filed Sept. 20, 1927 A. .5? 1222772515 aye)" Patented Aug 26, 1930 UNITED- STATES PATENT OFFICE,"

AUDLEY E. HARNSIBERGER, or CHICAGO, ILLINOIS, ASSIGNQR T rm: PURE OIL com- 1 PANY, or CHICAGO, ILLINOIS, A CORPORATION or 01110 MEANS FOR PRODUCING HEAT-TRANSFER CONDUITS Application filed September 20, 1927. Serial No. 220,770.

' means of which themetal between the collars will be displaced and crowded into engagement with the collars so as to firmly retain the latter in the desired spaced positions'upon the conduit.

For a further understanding of the invention reference is to be had to the following description and the accompanying drawing, wherein:

Figure 1 is a vertical longitudinal sectional view taken through a heat transfer conduit formed in accordance with the present invention and illustrating the apparatus employed in carrying out the invention,

Figure 2 is a vertical transverse sectional view on the line 22 of Figure 1,

Figure 3 is a side elevation of the displacing head.

Referring more particularly to the draw ings the numeral 1 designates generally the improved extended surface tube or conduit formed inaccordance with the present invention. This conduit has application in various heat exchange equipment involving transfer of heat from a gas, vapor or liquid on the outside of the tubeto a gas, vapor or liquid in the interior of the tube. The tube may be formed from any suitable metal such as steel, brass or any suitable alloy, depending upon the service for which the tube-is to be employed. Arranged on the tube at longitudinally spaced intervals are rings or collars 2, which are of suitable dimensions and arranged in predetermined spaced relationship, the internal diameter of said collars being just suflicient to allow the same to be slipped on the outer surfaces of the tube body 3. The body is then mounted on a lathe bed or other similar machine with the lead screw 4 of such machine disposed axially within the tube body. clamped rigidly, and the lead screw 4 is suit ably connected to the lathe chuck or face plate (not shown).

An expander 5 is then drawn through the tube by the rotation of the screw 4. This expander, in a simple form of the invention, consists of a head 6, provided with a plurality of radially extending arms 7, to which are pivoted as at 8 a plurality of longitudinally extending swinging frames 9. These frames are provided with recesses for the reception of axles 10 provided in connection with hardened steel rollers 11, which engage with the inner surfaces of the tube body 3. The operating position of the rollers 11 or the frames 9 are controlled-by the medium of set screws 12, the latter being providedwith heads 13, and the inner ends of said screws are set to bear upon the head 6 of the expander. Lock nuts 14 engage with said screws to insure the retention thereof in adjusted posi tions.

It will be seen that the steel rollers 11 may be said to bear against the inner wall of the tube body, displacing the metal of the latter by forcing it outwardly into the rings or collars 2, thereby forming slight undulations as indicated on the interior and exterior-of. the conduit, causing said tubes between said collars to possess a greater diameter than the internal diameter of the collars. By this construction and operation the rings or collars 2 are firmly united with the conduit body '3 to produce a fixed, unitary construction wherein relative movement between the rings or collars and the conduit body iseffectively precluded;

The tube is then,

The expander, having been drawn through the tube body, is shifted in position to an extent equivalent to the Width of one-0f the rollers 11 and then a ain forced or drawn through the bod T 's process is repeated until the desire expansion is obtained. It is obvious that in place of the adjusting screws 12 a wedge shaped collar could be forced underneath the swinging frames 9, thereby securing uniform adjustment of all the rollers.

- Other'modific'ations of the specific type of expander disclosed may be utilized without departing from the. spirit of the invention. For example, the expander .has, been shown as provided with four rollers. This number may be doubled if desired or two or more expanders may be utilized at the same time with their rollers spaced equidistantly around the interior of the tube. Of course, the interior of a conduit so formed will not be smooth, but in the majority of heat transfer operations this should 7 not prove objectionable.

stood that the rings or collars may. be of a different material than the tube. body, for

example, the utilizin of rings having a lower coefiicient of expans1on than the tube body itself, so as to prevent loosening of the rings It is also under plurality of arms having certain of their ends pivotally connected with said head and extending substantially parallel with said screw, rollers mounted upon the intermediate portions of said arms, and threaded adjusting devices carried by the outer or free ends of said arms and engageablewith said hub to'control the radial swinging movement of said arms with respect to said head.

In testimony whereof I aflix my signature.

'AUDLEY E. HARNSBERGER.

under extremely high temperature conditions.

-What is claimed is:

1. An expanding tool comprising a longitudinally extending screw arranged to be positioned axially within a tube, a head formed to include a hub internally threaded to receive the screw, a plurality of radially swing ing arms pivotally mounted at one end upon said head and lying in planes substantially parallel with said screw, rollers mounted for rotation on said arms and rotatable about axes arranged transversely to the axis of the screw, andmeans carried by the outer ends of said arms and engageable with said hub for controlling the radial adjustment of the arms and the rollers carried thereby, whereby said rollers may be crowded into contact with the inner peripheral walls of the tube in which 15 the same is positioned.

2. .An expanding tool comprising a head, means for moving said head longitudinally through a tube, a pluralit of relatively .sw'inging arms having certain-of their ends pivotally connected with said head, said arms being disposed generally in planes 'substan-.

tially parallel to the longitudinal axis of a co-operating tube, rollers carried by the intermediate portions of said arms and turnable about axes disposed transversely of the arms,

and adjusting devices carried by'the outer or free ends of said arms and co-operative with said head for, controlling the radial swinging movement of said arms and the no rollers carried thereby with respect to said head. 3. An expanding tool comprising a longitudinally extending screw, a head having a hub internally threaded to receive the screw and rotatable about the axis of the screw. a

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