US1679051A - Thermic siphon for locomotives - Google Patents

Description

July 31, 1928.

J. L. NICHOLSON THERMIC SIPHON FOR LOCOMOTIVES Filed Feb. 21. 1922 0 o O O 0 0 O o O O 0 O O FIG. 3

INVENTOR Patented July 31; 1928. V

UNITED STATES PATIENT OFFIUZ.

JOHN L. NICHOLSON, OF CHICAGO, ILLINOIS, ASSIGNOR '10 LOCOMOTIVE FIREBOX COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

THERMIC SIPHON FOR LOCOMOTIVES.

Application filed February 21, 1922. Serial No. 538,411.

My invention relates to improvements 'upon, or more accurately speaking, a modification of the so-ealled Nicholson thermic siphon, which is described and claimed in U. S. Letters Patent No. 1,337,720, granted April 20, 1920. The original thermic siphon is made by folding the sheet from end to end over a mandrel or the like, which gives the siphon a bottom line which is substantially straight from end to end. My present purpose is to provide a thermic sip-hon which shall make it possible to provide a given firebox with a greater sum total of heating surface than is possible with the siphon in its original form. To accomplish this purpose I depart from, the original method of siphon formation and truncate the upper rear end of the siphon, giving it at that point, a gently curved upward direction to meet the crown sheet of the firebox. This and other features of my invention will be readily understood on" referring to the accompanying drawings; and in which:

Figure 1 is a vertical longitudinal section of a locomotive boiler containing one or more thermic siphons embodying the present invention; Fig. 2 a vertical cross section thereof on theline 2.2 of Fig. 1; Fig. 3 is a topview of the firebox; Fig. 4 is an enlarged sectional view substantially on the irregular section line 4-4 of Fig. 1; Fig. 5

is a side view of the portions shown in Fig. 4t; Fig.-6 is a top view thereof. It will beunderstood that it is the practice to apply thermic siphons to locomotive fireboxes of all kinds and sizes. They are intended to increase the heating surface of a firebox and to cause a greatcirculation of water in the boiler, the extent of such cir-.

culation being dependent upon the firebox temperature and the area of the heating surface presented by the siphon. In designing thermic siphons for fir'eboxes of short lengths and relatively great depth, a strictly triangular form cannot be maintained in. the firebox and yet secure all of the added heating surface that is desirable. By this present invention I overcome that difiiculty.

In Fig. 1 the bottom line of the standard thermic siphon is represented by the dotted line 2, with which the full lines of the modified form shouldbe compared. The bottom or bulging portion 3 of the thermic siphon 1, corresponds to the standard siphon. Likelines persist in the top flange 8 of the siphon as clearly shown in Fig. 3. j p The gently curved rear corner 7 does. not

interrupt the upward and rearward flow of water through the siphon, (the water enters throughthe siphon neck 4), and hence any solids contained in the boiler water areswept upward and discharged through the top opening 4: of the siphon. However, for greater assurance in the matter of keeping that portion of the siphon clean. li'prefer to employ, and here provide, a valved blowoff pipe 9, as well shown in Fig. 1, one end 9 of the same hanging within the rear end of the siphon in position to exhaust any solids that may accumulate there.

corresponds in form to the flue sheetfi, of

As will be obvious to anyone skilled in the art, the welded joints or seams of the siphons should always be protected by closely adj acent'rows of stay bolts 15, as best shown in .Figs. 1 and 5.

This invention is of an extremely simple nature, but of considerable importance in the practical results which may be obtained through its employment.

Having thus described my invention, I

claim as new, and desire to secure by Letters Patent:

1. A thermic siphon having an angularly disposed bottom portion and a substantially upright front end, the rear end of said siphon being truncated to extend substan tially parallel with said front end and merging .into said angularly disposed bottom portion in a curve of a desired radius.

2. A thermic siphon formed from a single sheet of material folded along a predetermined line to form -an-angularly dis osed bottom portion and two parallel space side walls, the front and rear marginal parts of which are offset inwardly toward each other and are welded together to form substanti ally parallel front and rear ends of different heights.

3. A locomotive firebox comprising in combination with a thermic siphon having substantially parallel with said front end,

and merging into said angularly disposed bottom portion in a curved line, and a blow pipe having a leg within the siphon and arranged adjacent said truncated rear end thereof.

4. A locomotive firebox embodying therein a thermic siphon having an inclinedbottom portion and front and rear ends, the upper rear end being truncated and of a depth less than that of the front end and merging with the bottom portion upon a curved line. i I 5. A thermic siphon having an upwardly and rearwardly inclined bottom, a substantially upright front end and a truncated rear end which is disposed at an angle to the bottom and merges thereinto.

6..A thermic siphon comprising a flat tubular body having a' substantially horizontal elongated open top and having an inclined closed bottom which merges into a tubular neck, the front end of the body being substantially upright andthe rear end -thereof being relatively shorter than the front end and joining the bottom by a rounded corner.

-being bounded by an 7. A thermicv siphon comprising a fiat tubular body having a substantially hOIlzontal elongated open top and having' a closedbulged bottom portion, which terminates in a tubular neck extension, the front and rear ends of the body beingclosed and the rear end being shorter than the front end portion by a and merging into the bottom rounded corner.

81A thermic siphon having an angularly disposed closed integral bottom and a substantially upright front end, the rear end of the siphon being also substantially upright, said front and rearends being closed by fastening together edges of the sheet, at least'in part, and said fastened edges of the rear end being of less extent than the fastened edges of the front end.

9. A sheet metal thermic siphon having a closed bottom and an open top the open top integral flange, said siphonhaving a substantially upright front end closed by fastening together edges of the sheet,.said fastened edges continuing into the top flange and the line of saidfastened ed e portions in the flange extending at an ang e to the longitudinal axis of the siphon.

ture.

J QHN L. NICHOLSON.

In testimony whereof, I afiix my signa-

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