US951346A - Nozzle for elastic-fluid turbines. - Google Patents

Description

G. E. STEVENS.

NOZZLE FOR ELASTIC FLUID TURBINE-S.

AiPLIGATION FILED AUGA, 1908.

951,346, Patented Mar. 8 1910.

Geoe E. S bevemsg 1 parallel sides 4 and diverging edges 5.

' To all whom it may concern:

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GEORGE E. STEVENS, or LYNN, MAssAoHUsnTrs. .ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION or NEW YORK.

NOZZLE FOR ETQASTIOFLUIID TURBINES.

Specification of Letters Patent.

Application filed August. 4, 1908. Serial No. 446,841.

c itknown a citizen of the Lynn, county setts, have invented certain new and useful that I, Gnonon E.

lmpr n'ements in Nozzles for Elastic-Fluid.

Turbines, of which the following a specification.

This invention relates to nozzles such as are used in elastic fluid turbines to discharge the motive fluid. against the wheel buckets.

The OlJJOCt of the invention is to simplify the construction of such nozzles, reduce the cost of manufacture, insure accuracy in shape'and smoothness and hardness of the surfaces over which the elastic fluid passes, and secure exact uniformity and Srnvnxs, United States, residing at l of Essex, State of Massachuinterchangenbility where the nozzles are made in 1 large quantities. I

My improved nozzle is made of sheet metal, and is composed of two compLmentary parts or sections meeting on longitudinal lines, preferably a median plane. Each part section or half is therefore an open trough which can be easily struck up in dies, thereby insuring accuracy in shape, smoothness of surface, a hard-skin on the metal, and exact similarity between large numbers of nozzles. by joining their meeting edges in any suitable manner, preferably by The sections are united fusing or burning them together by an oxygen-acetylene a turbine, and also making repairs, inasmuch Close toa similar View of I the opposite edge and Fig. 6 is a sectional F A I I flame of high temperature, such as an acetyside elevation showing the nozzle inserted in its supporting plate.

he receiving end of the uozzleconsists of a bowl 1 preferably circular in cross section i in a plane of reyolution with reference to the axis of the turbine shaft. said mouth, as shown in F g.

The sides of 5, are curved wherein there is an to the same arcs as the tips buckets, while the ends of preferably radial, so that zles may be grouped edge to edge. This a number of nozinsures that-the fluid issuing'from said group forms a practicallyv solid or undivided column, and the curve .of the side walls causes the tuna to be delivered to the buckets.

This nozzle is composed of two complementary parts or sections 7, 8 united along longitudinal lines, preferably a median plane, so that the sections are similar halves. lilaeh half of the nozzle forms a trough, as shown in Figs. 1, 2 and 3, which can be easily madeby striking up or pressing a suitable blank between dies. After the parts of thenozzle are pressed or struck up there will usually be a certain amount of excess metal at or about the edges which are to be united. lVhen such is the case the said Patented Mar. 8, 1910.

and bases of the said month areand fit snugly together,.

whole of said 001- milled or otherwise machined and then united. handed and left-handed, two corresponding setsof dies are necessary. The use of dies insures exact similarity in all the sections, so that any pair of sections will fit: together, and the nozzle made therefrom will be cX- actly the same, as all others made from sections struck by the same dies. This is of importance in facilitating the assembling of as a defective nozzle can be replaced by a new one with entire assurance thatno alterations will be required. I

The two complementary sections 7, 8 may be united in any suitable manner. but preferably by placing their edges 9 in contact and welding or burning them together by a lene jet. After being united they are cut off obliquely to form the mouth of-the noz-- zle. 'The'curving of the sides of the mouth may be done either by the dies which-form the sections, or by a separate operation after the nozzle has been cut obliquely. The dies give not only accuracy of shape, but a smooth surface affording no obstruction to the flow of the elastic fluid, and a hard skin to the metal which increases the durability 10a of the nozzle.

I have illustrated an expanding nozzle increase in cr0ss-sec- As the sections 7, 8 are right-- tional area between the throat and the discharge end, but the invention is not so limited as it applies also to straight-bored and converging nozzles.

One very decided advantage attained by i using my invention resides in the fact that there is practically no waste material, the

with the apparatus Which I now consider to I represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is,

\ 1. As a new article of manufacture, a nozi -zle tor elastic fluid turblnes composed of two sheet metal trough-shaped complementary 1 sections meeting along longitudinal lines.

2. As a new article of manufacture, a nozzle for elastic fluid turbines composed of two i struck-up sheet metal sections united along 2 a median plane.

; As a new article of manufacture, a nozzle for elastic fluid turbines composed of similar sheet metal halves united along their meeting edges.

4. As a new article of manufacture, a nozzle for elastic fluid turbines composed of complementary sections each comprising part of the bowl and body portion.

5. As a new article of manufacture, a nozzle for elastic fluid turbines composed of sheet metal sections each comprising a half of the bowl and body portion.

.ln witness whereof, I have hereunto set my hand this first day of August, 1908.

GEO. l). STEVENS.

(itnesses Jonn A. McMAnUs, Jr., 1 ROBERT SHAixo.

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