US2559256A - Tie bar for heat exchange headers - Google Patents

Description

July 3, 1951 w, -f MATHENY 2,s59,25e

TIE BAR FOR HEAT EXCHANGE HEADERS Filed May 1'7, 1948 2 Sheets-Sheet 1 INVEN TOR.

Juiy 3, 1951 w. F. MATHENY 2559256 TE BAR FOR HEAT EXCHANGE HEADERS Filed May 17, 1948 2 Sheets-Sheet 2 ,99 INVENTOR,

Patentecl July 3, 1951 UNITED STATES PATENT OFFICE Arrow Industrial Manufacturing Company,

Tulsa, Okla., a corporation of Oklahoma Application May 17, 1948, Serial No. 27,525

1 olaim. l

This invention relates to tie bars for heat exchanger headers.

One important object of the invention is to improve on the usual cast iron tie bar of flat plate type wherein such tie bar is cast integrally with the header walls.

Another important object of the invention is to provide a novel form of tie bar employing a steel bolt to handle the stresses developed in high pressure headers.

A further important object of this invention is to provide a novel high pressure tie bar including a hollow circular tie bar cast integrally with the header body and employing a nickel steel bolt and brass sleeve.

A still further object of the invention is to form the tie bars of circular cross-section thereby effecting an increase in strength of such tie bars without materially increasing the weight or decreasing the number of tubes in the header.

Again, an object of the invention is to provide a circular form of tie bar which will eliminate the common fiat tie bar, the effect being to decrease turbulence and loss of pressure.

Still another object of the invention is to provide a circular tie bar so as to allow greater area of metal to tie to the faces of the header, thereby decreasing the amount of shrinkage cracks and consequent loss of castings.

Yet another object of the invention is to provide a brass sleeve or gasket between the circular tie bar and the steel bolt used herein.

Still further, an object of the invention is to provide a tubular tie bar for low pressure work wherein the tie bar is provided with a diametric slot and an open end for connection of a tube leading to another header.

With the above and other objects in view, the invention consists in general of certain nove1 details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and

Figure 1 is a fragmentary face view of a portion of a high pressure header constructed in accordance with this invention;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 2;

Figure 4 is a section similar to Figure 2 but showing a modified form of the invention;

Figure 5 is a section on the line 5-5 of Fig-l ure 4,' Figure 6 is a view similar to Figure 2 but showmg a second modification of the invention; and

Figure 7 is a section on the line 'l-'l of Figure 6.

In each form of the invention here shown, the back wall of the header is indicated at I 0 and the front Wall at l I. In devices of this Character, the front and back walls generally consist of large, flat plates of cast iron formed integrally with edge walls 12.

The front wall is provided with a multiplicity of tube openings it and the front and back walls are tied together by tie bars. In the form shown in Figures 1, 2 and 3, the tie bars include tubular members |4 cast integrally with the remainder of the header. Fitted in the members M are brass sleeves E5. Within the sleeves 15 are bolts it preferably of nickel steel. These bolts are heated and inserted in the brass tubes. The nuts ll on these bolts are then screwed up and the bolts allowed to cool. This puts considerable initial tensile stress on the bolts, thus holding the front and back walls from springing apart.

In the form shown in Figures li and 5, the front and back walls are connected by integral tubular tie bars |8 on which are fitted, without the use of brass tubing, tie bolts 9 provided with nuts 20, and these bolts are applied like the bolts |6 by heating for longitudinal expansion, inserting in the cast tie bars, tightening the nuts 2!! and coolmg.

For low pressure work, the form shown in Figures 6 and 7 may be used. Here the integrally cast tie bar 2| has a diametrically disposed slot 22 and opens through the walls i!! and H. The opening through the wall IO is plugged as at 23, while the opening through the wall ll may have a pipe 24 fitted therein for communication with the opposite header or the like.

What is claimed is:

In a header for the purpose set forth, front and rear walls of cast iron, tubular tie bars connecting said walls, said tie bar opening through said walls and having a diametrically disposed slot therethrough, a plug closing the tie bar at one wall and a pipe leading from the tie bar at the other wall.

WILLIAM F. MATI-IENY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA'I'ENTS Number Name Date 823,907 Walters June 19, 1906 977,276 Crowley Nov. 29, 1910 1921.6279 McKee Aug. 8, 1933

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