US941389A

US941389A - Turbine-blading.

Info

Publication number: US941389A
Application number: US43324908A
Authority: US
Inventors: John E Snyder
Original assignee: Westinghouse Machine Co
Current assignee: Westinghouse Machine Co
Priority date: 1908-05-16
Filing date: 1908-05-16
Publication date: 1909-11-30
Anticipated expiration: 1926-11-30

Description

J. E. SNYDER.

TURBINE BLADING.

APPLIGATION FILED MAY 16, 190B Pteuted Nov. 30, 1909.

3 SHEETS-SHEET l.

WITNESSES:

J. E. SNYDER.

TUBBINEQSLA DI NG. APPLICATION FILED MAY 16, 190B.

Patented Ndv. 909.

HEET

J. E. SNYDER.

TURBINE BLADING. APPLIOATION FILED MAY 16, 1908.

941,389. I v Patented Nov. 30, 1909.

. q; YN

Wk TNESSES:

50 located within the slotsand To all whom. (it may concern:

cheap. means for bladin tBe it known that LJoruf E. SNYDER, a citizen of the United States, and a resident of Swissva1e,in the county of Allegheny and State ofPennsylvania, have made a new and useful Invention in 'lu'rbine- Blading, of whichthe following is a specification.

.This invention relates to elastic fluid turbines and more. particularly to blading for turbines.

t- A n-object ofthis invention is the. produc-i,

'tion of a' simple, eflect-ive and relatively turbines.

. flwo methods of blading turbines are now quite generally employed. Each method employs blade-carrying elements provided vwithblade mounting slots, in which the blades are secured. Each slot is adapted to receive but. one row of blades.

-The method most-generally utilized employs separate calking or spacing ,pieces which are located in the blade-mounting slot between adjacent blades of a row and which are transversely expanded by a call:- ing pressure and caused to grip the exposed feces of the blades and the walls of the slot and to thereby secure the blades to the bladecarrying element. 7

in the other method the blades are assembled in segmental strips and the strips are then secured into the blade-mounting slots. Various means are employed for as- .sembling the blades in segmental strips and various ineanshave been employed for. se

curing the segmental rings to the blade-can rying elements. The most commonly emfployed is a segmental base strip which is provided with slots in which the faces of the blades aresecured and which, af-fter the blades are in place, is mounted, by means of a calking strip, into the blade-mountingslot. My invention is entirely difierent from either of these methods of mounting blades r but, while it is unlike both of them, it'is in some respects similar to each of them. :I contemplate providlng blade-mounting slots in the blade-carrying elements, each of which are adapted to receive more than one row of blades. The blades of each row are spaced by means of spacing pieces which are between adjaseat blades and which, with the blades, are secured in place by means of segmental base rises. p

drawings accompanying this applisstsno'n TD run w-nsrmenousn.

t TURBINE-BLADING."

specification of Letters Patent. Pgmentgd- Eg -3 19%;,

Application filed Iltay is, recs.v serial-no. 433,249.

cation and forming a part thereof: is a .fragmcntal sectiontal en longitudi nally of a turbine), of the bladerarrying clement ot' a turbine and discloses blades. cured to the blade-carrying element in ac;

Figure cordance with my invention; Fig. 2' is a perspective View of a modified form oi lock- 111g strip; F g. 8 1s a tragmental'scctioir of a blade-carrying element along the line A-A of Fig. 9 and discloses :1 modified form of the blade-mounting slot; Fig; 9 a section along the line 8 B of Fig. 8; and, Fig. 0 is a perspective view 0t. a detail of my invention.

Throughout the specification and 'in'the claims, I will utilize 'the word blade in its broadest sense, that is, to moan eitl'ie'r the rotating or the stationary blades and I wish. it to be understood that I do not desire to limit my invention to either the stationary or the rotating blades and it will be obvious to those skilled in theart that my invention may be employed in mounting the blades of rotary compressors, exhausters and like machines as well as in mounting turbine blades.

Referring to the drawings and more par ticularly to Figs; 1 and 2: the blade-carrying element 11 is provided with a blademounting slot 12"whioh is formed in the peripheral face ofthe blade-carrying ele-' "inentsandwhich is adapted to receive three rows of blades 13. lntorn'iediate spacing pieces More located within the slot'and between adjacent blades of each row, and these in place by means of segmental blade-holdmg rings 19 which arelocatcd within the slot and which are in turn secured to the blade-carrying element by means of seg= mental locking strips 15, which are located within the blade-mounting slots and are secured to the blade-carrying element by means of screws 16.

A. notch 17 out in each edg of each spacing pieces, With the blades, are secured blade 13 and is'located near one end of the i so as to secure the wire 22 within the recess blade. The spacing pieces let are so constructed that their top and bottom faces are parallel toeach other and plain. -The lat- 1 eral faces are also parallel to each other and extend at ri ht angles to the top and bottom faces; glue end face, whileit is perpendicular' to the top and bottom faces, is concave and conforms in contour to the contour of the convex faces of the blade. The other tom faces and 1s convex, conforming in contour to the concave face of the blades.

Each lateral face of the spacing pieces 15 provided with a longitudinally-extending notches 17 of adjacent blades when the within the blz'ide-inonnting slot 12. A lonformed by the slot and the notches and slots l i and 15. Segments of two bladeholding rings l9are then introduced into 1 the slot and are located back to back. The

head 26, formed on the segment of the ring adjacent to the blades located within the slot, cooperates with the notches of the blades and the slots of the spacing pieces to lock them in place, and the flange 27, formed end face is perpend'cular to the top and bot- 1 on that. segment, cooperates with an over-' hanging shoulder 28, formed on the wall of the slot 12, to hold the segment in place. The segments of each ring are then locked p in place by securing a segment of locking slot 18 which is adapted to register with the strip 15 to the ridge 23 by means of the 3 screws 16. This method is pursued until all pieces and the blades are located in place 1 itudinally-extending groove 20 is provided a in one of the side walls of the slot 12 and is located near the top of the slot. This groove 20 is adapted tocoiiperate with the notches 17 and slots 18, formed respectively on one side of the blades and spacing pieces assemtudinally-extending wire of the blades of the first row and the blademounting rings employed to secure them in place are secured to the blade-carrying element.

.\l'icr all of the blades pit-cesl-L of the first row of blades are in place and the segmental rings l-t securely ltlt'lfl'il to the blade-carrying element, the bled in one row, in securing n place a longiwhich, when 3 the blades are assembled in the bladc-niount- T ing slot, acts as a key to secure them to the blade-carrying element.

bottom of the slot 12 and extend longitudinally of the slots. These ridges are provided with tappcd'holes 2i and are emthe (lvel'llil llglllg portion of the locking stripand thereby hold the ringin place.

fil lac'hring is also provided with a longiiud i'ially-cxtcinlmg bead 2t) whicl; is located sec nd row of blades is secured in place in much the same manner. The b ades and intermediate spacing pieces of t second row of blades are. however, located on the locking strip 15 iii the first row of blades One or more ri. lgcs 23 are provided in the I mounting rings 19.

i'lorined respectively on both sides of the 5 blades and spacing pieces cooperate with the pl-oyed in securing the locking strips 15 to 1 The locking ion the same side of the ring as the flange 27 1 ai'id is aduplcd to wow-an wilh the notches i and slol'sprovidcd riispeclivcly in the blades and spacing pieces in securing the blades and piecesin the blade-carrying elements.

'lhe blade-holding rings and the bladenioniiting strips are preferably cut into short segments for convenience in mounting the blades. 5

in assembling the blades and spacing picccs and securing them lo the blade-carrying clcincnlsllic following method is preferably employed. The wire 22, which, if desirable, may be. cul in short sections, IS:

localcd in the notch 20 and a few of the blades 1; and intermediate spacing pieces ll of the first row of blades are located in place beads 2i) formed on the adjacent bladeinonnting rings to lock the blades in place. 'lhe blades of each successive row are secured in place by blade-mounting rings 19 and the rings, as described, are secured in the locking strip 15.

13 and spacing 'lhc lilnilc-liiolliilllig' rings of the last row 1 ol blades, secured in a slot [2. are secured in place by a inodilicd form of locking strip.-

'lhis niodilicd form of strip is of greater width than the strip shown in Fig. (3 and its pci'iplicrnl lace is llush wilh ilie peripheral 'l'acc ol, the bliulc-carryingelement.

In Fig. h a modilication of my invention is illustrated. The bladc-inonnling slot- 12 'll-l this modilica'rion isprovidcd with the iidg 'cs :23. shown in Fig. 2. but the construction diil'crs from Fig. in that the locking strips 1.) are integrally l'orincil with the ridges. llach wall ol the slot is provided with an o\ crlianging shoulder 28. the niodilied form of locking strip 1.) as illustrated in Fig. 6 having been done away with.

ln order that the bladc-niounlin; rings .15) may be mounted in the separate slots into which each slot 1". is divided by the ridges 221. the lllilllldlltilllli'illfl strip or llaiigc 15 0| each l'iilgc-is cut away as shown in Fig. 9 lo l'orni an nndcrcul slot 30. The \vidlh'ol l each slot is sullicicnl to admit the segments of tlic bladc-liohiling rings 19 into the slots.

A wedge-shaped or dovetailedilrey 3i is adapted to lock the blade-mounting rings in place by being inserted into the under cut slot 30 and is itself held rigidly in place between adjacent blade-mounting rings by the undercut walls of the slot. The last blade-mounting rings mounted in a slot 12 are introduced into the slot through a slot 32*formed in the overhanging shoulder 28;?

This slot obviouslyv can not be undercut and the retaining key 33 for the blade-mounting rings is rectangular and is secured in place j invention-can .be carried out by other means.

What I claim is: -1. In combination with a blade-carrying element provided with a slot, a plurality of' rows of blades mounted in said slot, blademounting rings 'for'securing said blades in 'place and locking strips secured to said blade-carrying eleinent for locking said blade-mounting strips in place.

2. In combination with a blade-carrying element provided with a slot, a plurality of .rows of blades mounted in said slot, intermediate spacing pieces. located between adjacent blades of each row; blade mounting rings located between. adjacent rows of blades for securing said blades in place and locking strips secured to said blade carrying element for locking said blade-mounting rings in place.

3. In combination with a blade-carrying element provided with a slot, a plurality of rows of blades mounted within said slot, segmental blade-mounting rings located between adjacent rows of blades for'securing said blades in place anda locking strip sup;

porting a row of blades and adapted to se re said blade-mounting rings in place. 4. In combination with a blade-carrying element provided with a slot, a plurality of rows of blades in said slot and having notched edges, blade-mounting rings having ribs to engage the notches or positively securing said blades in said' slots and locking strips for positively securing said rings to said blade-carrying element f" In testimony whereof, I have. hereunto subscribed my name this 12th day of May,

JOHN E. SNYDER. Witnesses:

CHARLES W. MCGHEE, E. W. MCCALLISTER.