US2347034A - Turbine bucket wheel and the like - Google Patents

Description

April 18, 1944. .J. H. TDORAN Y 2,347,034

TURBINE BUCKET WHEEL AND THE LIKE Filed March 28, 1942 Inventor:

' Joh H. Dorah,

His Attorney.

Patented Apr. 18, 1944 um'rso sures PATENT oFFics TURBINE BUCKET WHEEL AND THE LEE I John H. Doran, Scotia, N. Y., assignor to General Electric Company, a corporation of New York Application March 28, 1942, semi No. 436,593

(Cl. ass-'27) 7 Claims.

as a bucket wheel or diaphragm in elastic fluid turbines.

One object of my invention is to provide an improved construction and arrangement of the type of bladed bodies above specified, and another object of my invention is to devise an improved method of manufacturing such bodies.

For a consideration of what I believe to be novel and my invention, attention is directed to the following description and the claims appended thereto in connection with the accom panying drawing.

In the drawing Fig. 1 illustrates a bladed body, partly broken away, embodying my invention; Figs. 2, 3, 4 and 5 illustrate several steps in the manufacture of such bladed body in accordance machined along the lines 22 and 23 to produce on said rim a plurality of circumferentially spaced lands 24 (Fig. 3) inclined towards the axis of the disk. The lands 24 then are partly cut away and shaped on a known type of milling and copyin I machine to produce projections l2, as illustrated in Figs. 4 and 1. The blades are produced from thin sheet steel by a forming and-pressing operation. The inner half 25 and the outer half 26 of each blade may-be produced from a single piece of sheet metal by a forming and pressing operation. The adjacent edge portions 2! of said halves may be fused together and subsequently machined. The sections l5, l6 of the outer ring or shroud may be manufactured in the same inanner as the disk. The projections i8 on said sections i5, it are also formed by a-milling operation. In case the outer ring is formedfrom a straight strip of metal, the projections i8 may be produced prior or subsequent to the bending.

of such strip.

While in the arrangement shown in Fig. the

outer band or shroud l5, I6 is provided with prowith my invention; Fig. 6 shows a modification 4 according to my invention; Fig. 7 is a section along lines 1-7 of Fig. 6; and Fig. 8 shows another modification according to my invention.

The bladed body shown in Fig. 1 comprises a disk in with a rim it having an outer cylindrical surface with a plurality of circumferentially spaced radial rojections are crescent or airfoil-shaped. A plurality of circumferentially spaced, curved, hollow blades or partitions it are secured to the projections l2. Each projection l2 fits into the hollow end of a blade or partition and is preferably fused thereto by stitch or spot-welding, as indicated at M. The outer ends of the blades or partitions is are connected by a ring which in the present instance has a plurality of circumferentially spaced sections it, it with ends I! rabbeted together. Each section l5, l8 has a plurality of circumferentially uniformly spaced projections i8 formed on its inner surface. Each projection l8 fits into the hollow end of a blade or partition l3 and is secured thereto, preferably by a spot or stitchwelding. as indicated at I9.

During the process of manufacture of such bladed body a disk 2o (Fig. 2) with a rim 2| is formed. The cylindrical surface of them 2| is i2 integrally formed therewith. These projections ordinarily openings 32 with raised edges or projections 33 jections 88 formed by a machining operation, such projections may also be produced by a punching and forming process. Such an arrangement is disclosed in Figs. 6 and '1. This-arrangemerit comprises a shroud or band 30 secured to the outer ends of buckets or partitions 3!. The shroud has a plurality of circumferentially spaced formed around the openings. These projections may be produced by asimple punching and forming operation. Each projection is fused to an end portion of a blade. In the present example the end portions of the blades or partitions 3! project into the opening formed by the raisedportions or projections 33 and are fused thereto by stitch-welding or brazing. The raised portions or projections 33 are of uniform height only around the wide portions 34 of the openings and taper gradually towards the thin 'end portions of 40 has a plurality of circumferentially spaced openings H with raised edge portions 42 around the openings or at least along the wide portions of these openings. The raised edge-portions 42 project into the ends of the hollow partitions the nozzle structure is secured to a disk 46 by means of welds 41.

Having described the method of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

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

1. Bladed body comprising a disk having a rim with a plurality of circumferentially spaced curved projections integrally formed thereon, a plurality of circumferentially spaced hollow blades each having an end portion enclosing and fused to one of the projections, and an outer ring connected to the outer ends of the blades,

said ring having a plurality of circumferentially spaced projections, each projectionextending into and being fused to the hollow end of a blade.

2. Bladed body comprising a disk having a rim, a plurality of circumferentially spaced blades secured to the rim, each blade having a hollow end portion, and a cover havinga plurality of circumferentially spaced projections fused to and extending into the hollow end portions of the blades.

3. Bladed body comprising a band having a plurality of spaced curved openings with projections along the edge portions of the openings,

and a plurality of hollow blades, each blade having anend portion fused to a projection.

4. Bladed body comprising a band having spaced curved openings and a projection formed around part of the opening only, and a plurality of hollow blades, each having an end portion projecting into an opening and fused to a projection.

5. A turbine nozzle structure comprising inner and outer bands each having a plurality of spaced curved openings with a projection along the edge of each opening, the projections of one band facing the projections of the other band, and a plurality of spaced blades, each blade having end portions surrounding and fused to corresponding projections of the inner and outer bands.

6. Bladed body comprising a band having a plurality of spaced curved openings with projections along the edge portions of the openings, and a plurality of blades each having an end portion telescoping a projection and being secured thereto.

'7. A turbine nozzle structure comprising inner and outer bands each having a plurality of spaced curved openings and a projection along the edge of each opening, the projections of one band facing the projections of the other band, and a plurality of spaced blades each having an end portion telescoping and secured to corresponding projections of the bands.

JOHN H. DORAN.

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