US1014683A - Turbine-blade. - Google Patents

Description

G. WESTINGHOUSE.

TURBINE BLADE.

APPLICATION FILED JUNE 24, 1910.

Patented Jan. 16. 1912.

lrlllli .form, in efiect, an inner and an GEORGE WESTINGHOUSE, 0F PITTSBURGH, PENNSYLVANIA.

TURBINE-BLADE.

Specification of Letters Patent.

Application filed June 24, 1910. Serial No. 568,679.

To all whom it may concern:

Be it known that I, GEORGEVVESTINGHOUSE, a citizen of the United States, and a resident'of Pittsburgh, in the county of Allegheny and State of Pennsylvania,have made a new and useful invention in Turbine- Blades, of which the following is a specification.

This invention relates to-elastic fluid turbines, and more particularly to blading for such turbines. I

An object of this invention is to produce new and improved turbine blades and a new and improved means of securing the blades in place on the rotor element of the turbine This and other objects I attain by means of blading embodying the features herein described, and illustrated in the drawings accompanying this application and forming a part thereof.

In the drawings, Figure 1 is a side elevation of a rotor element of a turbine equipped with blades embodying my invention. ig. 2 is a section along a diameter of the element shown in Fig. 1; and, Fig. 3 is a perspective view of a turbine blade which forms a detail of my invention.

Referring to the drawings: the blade 3- illustrated in Fig.3 as an embodiment of m invention comprises a body portion 4, whic is provided with concave and convex working faces, a mounting shank 5, and projecting flanges 6 and 7 formed on the convex side of the body portion and respectively located at the outer a d inner ends of the body portion. The blades 3 are adapted to be mounted in annular rows and the flanges Gand 7 are so formed that they cooperate tov outer shroud for each annular row of blades. The end of each flange is convex and corresponds in contour to the curvature of the concave working face of the blades; and the blades in each row are so mounted that the flan es of one blade contact and cooperate with t a concave face of the next adjacent blade so that the blades are held in their proper relative positions.

The blades 3 may be mounted on the rotor element in any suitable manner. In the drawings I have illustrated a rotor element or wheel 8 provided with radially extending drilled holes or openings formed in the peripheral face and each opening is adapted to receive the mounting shank 5 of a blade'3. Each shank is secured in place in its respecing tapered tive opening by means of a transversely extending pin or rivet 9 which extends through an opening 10, provided in the shank, and openings .formed to the lateral face of the wheel 8. After the-blades are mounted on the wheel and the rivets 9 are in place, the

rivets are riveted over at their ends or in any other suitable manner rigidly secured in place so that the blades are positively secured to the wheel.

Each annular row of blades is provided with a shroud ring or wearing strip 11 which is mounted on the ends of the blades.

In the drawings I have illustrated a ring 11 the inner face of which is threaded, the threads being adapted to engage correspondscrew threads cut on the outer peripheral face of the shroud formed by the cooperation of the ends of the blades 3 and the flanges 6. The threads on both the ring 11 and the ends of the blades are tapered screw threads. By tapered screw threads I mean threads socut on the ends of the blades 3 and flanges 6, for example, thatthe extreme diameter of the annular row of blades will be less on one side of the blades, for example onfthe left hand side of Fig. 2 at 13, than on the right hand side. The taper of the threads on the ring 11 corresponds with the taper on the blades and, with this arrangement, the farther ring 11 is screwed onto the annular row of blades 3 the tighter it becomes and consequently almost any desired degree of compression may be imposed upon the blades by the ring. I also provide means for locking the ring 11 in place, such for example as one or more screws 14 which may be located at intervals around the ring 11 and which extend through the ring and into the body portion of one or more of the blades which are properly drilled and tapped to receive them. It will be apparent with this construction that each of the blades will be corrugated or screw-threaded at the end and will, therefore, be rigidly held against lateral motion. The flanges 6 and 7 will prevent transverse motion, and the ring 11 will prevent radial motion of the blades. In addition to the ring, the

mounting shanks of the blades and the rivets Patented Jan. 16, 19-12.

1. In combination in a turbine, a plurality of blades'mounted in an annular row on the turbine rotor and a ring threaded onto said E blades.

of blades mounted in an annular row, and a 1 solid metal ring threaded on its inner face and screwed onto the ends of the blades.

3. In combination in'a turbine, a plurality of blades mounted in an annular row, and a solid ring screw-threaded on its inner face and adapted to engage screw threads formed on the outer ends of the blades.

4. In combination in a turbine, a plurality of turbine blades mounted in an annular. row, a ring provided. with tapered threads and adapted to engage threads provided on the outer ends of the blades, and means for locking said ring in place.

5. In combination in a turbine, a plurality of blades mounted in an annular row, and

Copies of this patent may be obtained for five 'cents each, by addressing the Commissioner of Patents;

I I l l I x l l i t l provided with flanges which cooperate to threaded on its inner face, and adapted to engage screw 'threadsformed on' the peripheral face of said shroud.

6. A turbine blade provided at one end with a mounting portion and at the other end with screw threads which extend across,

the end of the blade.

7. A turbine blade provided with transversely extending screw threads.

In testimony whereof, I have hereunto subscribed my name this 23d day of June. 1910.

GEO. WESTINGHOUSE.

\Vitnesses I C. W. MoGHnn, MOCALLISTER.

Washington, D. 0.

2O form a shroud, and a solid ring, screw- 2. In combination in a turb ne, a plurality

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