US1749449A - Turbine blading and lashing therefor - Google Patents

Description

March 4, 1930. H. R. EVENSON 1,749,449

TURBINE BLADING AND LASHING THEREFOR Filed June 6, 1928 WITNESSES: INVENTOR 6L5. H-Rfil'evensou ATTORNEY Patented Mar. 4, 1930 UNITED STATES PATENT OFFICE Howl nnn. srnvnivson, or ennnnon, NEW JERSEY, ASSIGNOR T WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA TURBINE IBLADING- AND. LASHING- THEREFOR Application filed June 6,

in the blades through, or into which the lashing or bracing members have been in-' serted. These holes tend to weaken the 2 blades and where blade failures occur, it is r not uncommon to find the blades broken through these holes.

A more specific object of'this invention,

therefore, is to provide turbine blading whichshall be free from holes or other recesses such asare usually provided for lashing or bracing members and, at the same time, to make ample provision for properly zosecuring lashing, or bracing members to the blades and thus, to obtain stronger and more durable blading.

This and other objects are effected by my invention, as will be apparent from the following description and claims taken in connection with the accompanying drawings, forming a part of this application, in which:

Fig. 1 is a plan view of turbine blading, showing the lashing element in section for purposes of illustration; 7 n

Fig. 2 is a partial front elevation of the blading shown in Fig. 1;

, ig. 3 is a perspective View of type of turbine blading; and,

Fig. 4 is a plan view ofthe blading shown in'Fig. 3.

In accordance with'my invention, both faces of a turbine blade are provided with projections which, preferably, are circum ferentiallyaligned, and these projections are then secured together, either directly as by soldering, welding, riveting or the like, or a spacing element is secured to these projections in any approved manner. Inthis way, a blade lashing. may beprovided without I weakening the blades by means of holes, or other recesses, which have heretofore been considered necessary. I p In Figs. 1 and 2 of the drawings, I show the turbine blades 10, provided'with proanother 1928. Serial No. 283,345.

jections 11, which are, preferably, in alignment circumferentially of the rotor and which have their outer end portions 12 re-. duced to provide a shoulder 13 adjacent the blade. In the form of my invention shown in these figures, a tubular spacing member 14 is fitted over the reduced end portions 12 of theprojections 11 and against the shoulders 13. This tubular member 14 may be secured by soldering, brazing, welding or the like, but preferably, is secured to these projections by means of the rivets 16, which extend transversely through the tubular 'member. and through the projections. In

this way, it is possible to provide a lashing which is simple and inexpensive to construct and has the requisite physical characteristics and at the same time does not weaken the blades. A form of lashing similar to the conventional wire lashing is thus produced; that is, a lashing of small cross-section,

- spaced from the ends of the blades and located intermediate the inlet thereof.

The form of my invention shown in Figs. 3. and 4, while suited to any type of blading, is particularlyadapted to the side entry type of blades, such as shown in Fi 8. In this view,'it will be noted that the lades 21 are provided with root portions 22, which fit in transversely extending grooves 23 in the and outlet edges turbine disc 24.

Projections 26 and 27, as shown in Fig. 4, areformed on the front and back faces of the blades, respectively, and are, preferably, circumferentially aligned with respect to the rotor, the same as the projections shown in Figs. land 2. The projections 26 and 27 preferably have their end portions arranged to interfit in some suitable manner, as for example, by means of'a tongue and groove joint,

by holes or other recesses in order to provide for the lashing, and furthermore, while I have shown my invention as embodied in a lashing element, it will be quite obvious that my invention is not so limited, but that it may also be embodied in a manner similar to that just described in a system of bracing for turbine blades; T

While I have shown my invention in several forms, it will be obvious tothose skilled in the art that it is not so limited, but is susceptible'of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall'b'e placed-thereupon as are imposed by the prior art or as are specifically s set forth in the appended claims.

WVhat I claim is:

1. In a turbine, a plurality of imperforate p blades in arow, lashmg means comprising a I plurality of lashing elements interposed between adjacent blades, said lashing elements being located intermediate the inlet and outa lot edges and spaced from the ends of the blades, the outer terminal portions of the lashing elements being integral with the ad j acent blades,-and means forsecuring the lashing elements together between the blades. 7

2; In a turbine, a plurality of blades in a row, projections onthe blades and integral row, projections integral with the faces of the blades and having their outer ends reduced to provide a shoulder adjacent the blade, atubular member fitting over the re duced portions of adjacent projections and substantially abutting the shoulders on said projections, and means for securing the tubular member tosaid projections.

7. In a turbine, a pluralityof blades ina row, projections integral with the faces of the blades, each projection having its'outer end portion reduced to provide a shoulder adjacent the blade, a tubular member fitting V overthe reduced end portions of adjacent a projections and substantially abutting, the shoulders on said. projections, and a rivet eX- tending transversely tl'iroughthe reduced end portion of eachprojectionand through the tubular member for securing "the ubular member to the Projections In testimony whereof, I have hereunto sub: scribed my name this 29th day of May, 1928.

OWARD R. STEVENSONQ i therewith, and a tubular-member secured to adjacent projections to form alashing element. 3. In a turbine, a plurality of blades in a row, projections integral with the blades and located intermediate of the inlet and outlet edges and spaced from the ends thereof, and

means connecting the projections to forma lashing element. 7 v

4. In atturbine, a plurality of blades in a row, projections integral with the faces of the blades and substantially in alignment circumferentially of the rotor, said projections, "I being located'intermediate the inlet and out let and outlet edges andspacedfrom the ends of the blades, and means connecting the pro-' jections to form a lashing. 7 I

5. In a turbine, a plurality of blades'in a row, projections integral with; the faces of the blades and intermediate of the inlet and outlet edges thereof, and a tubularmembersecured to adjacent projections to form a lashing element.

' 6. In a turbine, a plurality of blades in a 7

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