US1416701A - Turbine blade - Google Patents

Description

W. B. FLANDER'S. TURBINE BLADE. 'APPLICATION man JUNE 22, 1920.

1,41 6,701., Patented May 23, 1922,

V EN 0R. an (8T5 WARREN B. FLANDERS, 6F ESSINGTON, P

HOUSE ELECTRIC AND BIANUFACTURING- COM'PAIJY, A

SYLVANIA.

CORPORATION OF PENN- TURBINE BLADE.

Lditifitlt.

Application filed June 22,

To all whom it may concern Be i ln-own that l, lVAnnnu B. Fnennnns, a citizen of the United States. and a resident of Essington. in the county of Delaware and State of Pennsylvania, have invented anew and useful lnipro einent in lurbii'ie Blades. of which the following is a specification.

This invention relates to elastic fluid tur' bines. and more particularly to locking and spacing means for the outer ends of the blades thereof.

it is now common in elastic fluid turbines in which the blades thereof are arranged in annuiarly-extending rows to secure the outer ends of the blades in one such row together by means of a coinina-sl'niped lashing. the tail being sheared on each side of each blade and bent over or turned out of alignment with the conn'ua-shaped holes through the blades. thereby forming spacing pieces which are integral with the locking strip. and the end edges of which contact with the complementary faces of the adjacent blades. The obiection to this method is that the end edges of the spacing pieces thus formed d not encounter plane surfaces on the faces of the adjacent blades but the curved surfaces of the blades.

The object of my invention is to provide plane surfaces on the turbine blade where the lashing passes through so that when the tail of the comma-shaped lashing is sheared and bent over. plane surfaces substantially perpendicular to the lashing will serve as abutrnents for the tail of the lashing.

I attain this object by means of the blade shape shown in the accompanying drawing, in which- Figure 1 is a plan View of the blade and lashing; Fig. 2, a front elevation of the blade and lashing; and Fig. 3, a sectional View taken along line III-III of Fig. 2.

Referring to the drawing for a more de tailed description of my invention, in l I indicate a turbine reaction blade 10 formed according to my invention. 1

lcar the end of the blade where the lashing 11 passes through, the inner surface of the blade is provided with an indentation or recess 12 so that. a plane surface substantially perpendicular to the lashing is formed. 0n the outer surface of the turbine blade where the lashing passes through an extension or projection 13 is provided which forms a plane surface substantially perpendicular to the Specification of Letters Patent.

. and after a few of the blades have been inlPa-tented May 23, ]l$l2%. 1920. Serial No. 390,905.

lashing. The portion of the blade where the lashing passes through is therefore of constant thickness and offers plane perpendicular surfaces to the lashing.

In 2 is shown an elevation of the blade 10 attached to the rotor 141-by any one of the modern methods. The blade at its outer end is provided with a hole or open ing 15 conforming to a cross section of the comma-shaped locking and spacing strip 11. These holes or openings are preferably punched in the blades before they are assembled in their holding slots in the rotor,

serted into the slot the lashing will be threaded therethrough, and the remaining blades strung onto the holding strip and then inserted into the slot in the turbine rotor.

After the blades have been fastened in place in the slot in the turbine rotor and the lashing inserted, the tail 16 of the lashing is cut or sheared in close proximity to the plane surfaces of the indentations 12 and extensions 13 of the adjacent blades. and the tail so sheared is bent over or turned out of alignment with the holes through the blades. thereby forming spacing pieces which are integral with the lashing. and the end edges of which contact with the plane surfaces of the indentations 12 and extensions 13.

Figure 3 a section taken on line IllIH of Fig. 2 shows the shape of the blade at the point where the lashing passes through.

it is obvious that by forming the blades according to my invention a better connection is obtained between the blades and lashing. In the present method when the lashing is sheared and tail bent over, the end edges encounter the curved surfaces of the blades. By providing a blade as described by my invention, abutnients of constant thickness and presenting plane and substantially perpendicular surfaces to the lashing will be formed for the end edges of the sheared lashing.

While I have shown my invention in but one form, it will be obvious to those 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 be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is 1. A turbine blade havin a lashing opening and a lashing member iaving a deformable tail or tongue portion passing therethrough, a portion of the blade surrounding the opening being of constant thickness to 'constitute abutments for the deformed tail and plane surfaces surrounding the opening and substantially normal to the axis of the opening and a comma-shaped lashing member passing through and fitting the opening and having its edge portion deformed ad jacen't the opening and embracing a portion of said blade of constant thickness defined by said plane surfaces. 7

4:. The combination-of a turbine blade having a lashing opening near its tip and plane surfaces on both faces thereof surrounding the lashing opening and substantially perpendicular to the axis of the opening and a lashing member fitting in the opening and partially sheared and deformed on each side of the blade, the blade portion bounded by said plane surfaces constituting an abutment portion of constant thickness for the deformed lashing portions.

In testimony whereof, I have hereunto subscribed my name this 16 day of. June, 1920.

WARREN B. FLANDERS.

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