US1825479A - Exhaust nozzle - Google Patents

Description

Sept. 29, 1931. c. SEYMOUR 1,825,479

EXHAUS T NO Z ZLE Filed NOV. 9, 1929 INVENTOR ATTORNEY Patented Sept. 29, 1931 CHARLES SEYMOUR, OF ROCK, ARKANSAS EXHAUST NOZZLE Application filed November 9, 1929. sem No. 406,032.

My present invention has reference to exhaust nozzles for locomotives, and has for its primary object the provision of a nozzle adapted to break up or deform the body of l steam as it issues from the nozzle, to aslight extent, but without reducing its velocity, so as to secure a better entrainment of the gases in the smokebox without decreasing the velocity of the body of steam so that the mixture of steam and gases of combust on will completely fill the stack in emerging therefrom, and further one by whose use back pressure is avoided.

To the attainment of the foregoing the 1n- 5 vention consists in the improvement hereinafter described and definitely claimed.

In the drawings:

Figure 1 is a view of the improvement in applied position, the forward portion of the locomotive being in section.

Figure 2' is a sectional view through the improvement approximately on the line 2-2 of Figure 8.

Figure 8 is a top plan view thereof.

In general shape and form my improved nozzle is similar to that of the ordinary type, the same being provided with the circumferential blower passage 1 which communicates with vertical passages 2 in the upright conical members 3.

The cylindrical bore of the nozzle 4, however, is rifled to provide the same with ribs 5 which extend the entire length of the said bore of the nozzle. The ribs 5 are equidistantly spaced, but are angularly arranged and have their upper ends 6 projecting into the bore for a considerable distance and from thence gradually decreased in thickness so that the same merge into feather edges at the bottom of the nozzle. In a like manner the ribs 5 gradually increase in width from their said upper edges to their feathered bottom edges. Thus the ribs provide passages 7 therebetween which gradually increase in width from the lower to the upper edge of the nozzle.

Because of the particular and peculiar shape of the ribs and the passages between the ribs the improvement will create a complete vac- 50 uum at the locomotive front as the same gives a free and unrestricted passage to the atmosphere through the petticoat 8 and smoke stack 9 of the locomotive 10. This passage is not interfered with as would be true were lugs or splints used with the improvement as the same retard the passage of steam and cause a certain backward pressure. The ribs of the improvement are not to be considered in the nature of lugs and as the said ribs are tapered inwardly on their inner faces from their upper to their lower ends and are gradually increased in width from their said upper to their lower ends thesteam contacting therewith will be directed inwardly or to the center of thenozzleand likewise to the f center of thepetticoat 8. The steam that flows through the angle passages 7, which increase in width from their lower to their upper portions, is caused to assume an angle path, but directly upwardly through the nozzle. This angle and whirling steam has commingled therewith the steam that passes through the openings or passages 2 in the short nozzles 3 and the steam directed along the ribs, through the passages 7 and through the short nozzles 3 is not permitted to spread away from the nozzle of the improvement, but

is, so to speak, bunched as the same is directed into the petticoat 8, and as stated, an almost perfect vacuum is thus created which cannot 30 be obtained by the use of straight, angle or twisted or curved ribs in the bore of the nozzle.

I am aware that exhaust nozzles for this purpose have been provided with ribs or lugs but from experience I have found that such constructions retard the passage of steam and cause a certain amount of back pressure. Therefore, I make no claim to a nozzle provided with ribs or lugs. ,9

Having described the invention, I claim:

An exhaust nozzle arranged in a smokebox of a locomotive below the petticoat pipe of the stack which includes a body that is substantially circular in cross section, which has? its upper portion provided with a blower passage, vertically arranged outlet passages communicating with the blower passages and conical members surrounding said openings,

said nozzle having its bore rifled longitudi- 10o nally to provide the same With ribs which are substantially equi-distantly spaced, the portions of the ribs at the upper end of the body being projected a material distance into the bore thereof, and the faces of the said ribs gradually decreasing in both Width and thickness to the bottom of the nozzle and merging into feather edges at the bottom of the nozzle and providing angle passages therebetween and the said passages vbeing gradually increased in Width from the lower to the upper end of the nozzle.

In testimony whereof I aflix my signature.

CHARLES SEYMOUR.

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