US943480A

US943480A - Blade-mounting means.

Info

Publication number: US943480A
Application number: US43325008A
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: 1909-12-14
Anticipated expiration: 1926-12-14

Description

J. E. SNYDER, BLADE MOUNTING MEANS. APPLIOATIOH FILED MAY 1a, 1908.

943,480, Patented Dec; 14, 1909.

2 SHEETS-SHEET 1.

" STATES 135mm" OFFICE.

norm is; sn'vnnn, or sw'IssvA'LE, PENNSYLVANIA, Assronon 'ro THE wnsrmenousn means for turbines.

An object of this invention 1s the produc- To allcchotb/it may concern: l p

Be i known thatI, JOHN E, SNYDER, a citizen of the United States, and aresident of Swissvale, in the county of Allegheny i and State of Pennsylvania, have made a new 'anduseful Invention" in Blade-Mounting Means,,of which the following is a specification;

This invention relates to elastic fluid turbines and more particularly to blading tion of-s'nnple, efi'ectiveand-r'elatively cheap means for blading turbines.

Two methods of blading turbines have heretofore been generally employed. In

-' each method the blades are secured :into

blade-mounting slots provided in the bladecarrying elements and adapted to receive a generally utilized employs separate calking but one row of blades. The method most or spacin pieces which are located between adjacent lades of a row and. which are transversely expanded'by a calking pressure 25 blades and the wa s of the slot and to'thereand caused to gri the exposed faces of the by secure the blades to the blade-carrying element, The other method contemplates assembling the blades in segmental or blademounting rings and then securing the ring into the blade-mountin slot. Various means have been employed or securing the segmental rings or strips in place, but the most commonly used is a metallic ca'lking strip which is inserted into the slot between the segmental ring and an-fij'acent wall of the slot. The calking strip is then subjected to a transverse calking pressure and is thereby transversely expanded and forced, on one I side into gripping contact with the adjacent wall .of the slot-and on the other side into gripping contact with one face of the blademounting ring and also forces the blademounting ring into gripping contact with the other wall of the slot.

lily invention. contemplates an entirely iinew method of m'ountin blades which, while it is unlike-either of t e two methods v dcscribed, is, .in somerespects, similar to both of them. I contemplate providing the blade-carrying element with blade-mounting slots which are adapted to receive two or.

more rows of blades. The blades of each row are spaced in the mounting slot by means of separate spacing pieces which are -MA.CHINE COMPANY, A CORPORATION OF PENNS YLVANIAI BLADE-MQUNTILTG Mann's.

Specification oflettprs Patent, Patented Deg, 14, 1909, Application-filed Kay 16, I908.- Serial No. 433,250.

located between adjacent blades. The spacing ieces and the blades are then secured .in p ace by means of a segmental ring, the segments of which are common to several blades and intermediate pieces, and which are secured in place by means of a calking strip.

. In the drawings accompanying this application and forming a part thereof: Fi re 1 p is a fragmental transverse section of a ladecarryin element embodying my invention' Fig. 2 1% a fragmentalsection of the blade carrying element shown in Fig. 1, with the blades removed, and discloses the blademounting slot; Fig. 3 is a 'fragmental section of a blade-carrying element and (115- closes a modification. of my invention; Fig.

4 is a fragmental section of the blade-carrying element shown in Fi 3 with the blades 3 removed; Fig. 5 is a In ific'ation of a'blade employed incarrying out my invention; Fig.

6 1s a perspective view of an intermediate spacing piece; and Fig. 7- is a erspective new of a segmentof' a blade-ho ding ring embodied in ,my invention,

Throughout the specification and in the claims I will utilize the word blade in its broadest sense; that is, to meanv either the moving or stationary blades and in so doing I wish it to be understood that the bladecarrying element also means either the 'rotatin or stationary blade-carrying element.

Re erring to the drawings and particularly to Figs. 1 and 2: The .bladecar-rying element 8 is provided with a blade-mountmg slot 9, which is adapted to receive two rows of blades 10. Intermediate spacing pieces 11- are located between adjacent blades of I each row I and these spacing pieces, with the blades, are secured in place by means of a segmental blade-holding ring 12, which. is

in the .bottomor' the 'slot 9. 'Each row of blades mounted within the blade-mounting slot 9 is provided with a blade1h0lding ring 12 and the two rings mounted in each slot 9 cut in each. edge of the blade ,near one end.

located in an undercut'depression 10 formed The spacing pieces 11 are so constructed thattheir top andv bottom faces are parallel to each other and plain. The lateral faces are also parallel to each other and are at. right angles to the top -and bottom faces. One

end face is concave and conforms in contour to the contour of the convex face of the blades and the other end face-1s convex and .conforms in contour to the concave face of the blades. Each lateral face of the spacing spacing pieces assembled in one row, in se-- curing in place a longitudinally-extending wire 17 which, when the blades are assembled in the blade-mounting slot, acts as a key to secure them to the blade-carrying element. The depression 10in the bottom of the blade-mounting slot 9 is undercut on each side at 18 and each blade-holding ring 12 is provided, near its base, with a longitudinally-extending flange 19 which, when the ring is in place within the blademounting slot, projects intoone of the slots provided at 18 and is effective in positivelylocking the'blade-holding ring to the blade-carrying element. Each ring is also provided with a longitudinally-extending bead 21 which is located on the same side of the ring as the 'flange 19 and which is adapted to project into the groove formed by the notches and

slots

14 and 15, formed respectively on one side of the individual blades and pieces.

In assembling the blades and securing them to the blade-carrying element the following method is preferably employed: The blade-holding rings 12 are cut into relatively short segments, which 'subtend at least five blades 10 and intermediate spac in pieces 11. The wire 17, which, if desirab e, may also be cut into short sections, is located. in the notch 17 and a few blades and intermediate spacing pieces of each of the two rows, which mounting slot 10 is adapted to receive, are located in place so as tohold the wire 17 in formed. by the slot 16 an the notches and --slotsl4 and 15. A segmentof the bladeholding ring for each row of blades is then' introduced into the slot and secured in place either temporarily or permanently by means of the calking strip-13. This method is pursued until-all of the blades are assembled'within the slots. I The back face ofv each blade ring 12 is preferably a concave-con- .vex' surface and the surfaces are so formed oneaeh ring relative to" the surface of the adjacent or cooperating ring thatthe intermediate space between the ringshas a section corresponding somewhat to a section,

of a' distorted rectangle' These groovedelements by the coeperating flanges 19 and the undercut portions of the blade-mount- .flange 23 divides the slot 9 into two similar lace in the recess faces are provided merely to insure that the calking strip 12. will remain permanently. in place and will not be dislodged by centrifugal or other dislodging forces. lVhen the blade-holding rings are secured in'place in place by means 'of the locking wire 17 and the bead 21. The blade-holding rings are positively secured to the blade-carrying ing slot, so that with this construction the blades are all rigidly andpositively secured to the blade-carrying element.

fication of my invention. The blade-mounting slot 9 in this instance is arranged toreceive three rows of blades instead of two. A third and intermediate row is mounted upon an annularly-extending flange 23, which is formed integrally with the bladecarrying element and which extends 00-- axially with the blade-mounting slot. The

parts and cooperates with each wall of-the slot informing the undercut depression 10 in which the blade-mounting rings 12 are secured in place. The mounting of the blades within the blade-mounting slot is, with the exception of the intermediate row of blades, substantially similar to the method employed in securing the blades of the blade-mounting element shown in Figs.

1 and 2. The blades. of the intermediate row are supported by the flange 23 and are secured, in' place within the slots 10. by means of the two blade mounting rings 12, which are located on each side of them.

Each blade 10, as disclosedin Fig. 1, is pro; 105' vided with the notches 14: and each inter; inediatespacin piece 11 isprovided withthe longitudina ly-extending slots 15. The I grooves formed on each side of the interniediate-blade row by the coeperating slots .and notches 14: and 15 cooperate, in holding the blades in place, with the beads' 21 provided on the adjacent blade-holding rings.

This disclosure will make it evident to one .skilled in the" art that the blade-mounting- 11?. slots 9 may be constructed to receive and I place-any .number of rows of secure in blades.

" l'n'acc'ordance with the provisions of the patent, statutes, I have. described the princi 1e of operation of my invention, together with the apparatus which I now believe to re resent. thebestembodiment thereof, but I esire to have it understood thatthe apparatus shown is only illustrative and that the'125.

invention can'be carried out by other'means.

.-What I claim is:

' 1. In'coinbination with a blade-carrying element provided with a slot, a plurality of rows of blades, spacing pieces between the 70 the blades of each row are secured to the I blade-holding element and positively locked 8O In Figs. 3 and 1 I have-shown a modi- I rows of blades inthe slot rows of blades and calking pieces between the spacing pieces. I 2. In combination with a blade-carrying element provided with a slot, a plurality of rows of-blades, spacing pieces, theadjacentedges of which'are-irregular, and a calking 1 In testimony whereof, I have hereunto piece interposed between the irregular adsubscribed my name this 12th day of May, j acent faces of said spacing pieces. 1908.

'3. In combination with a blade-carrying element provided with a slot, a plurality of spacing pieces and having irl interposed between the irregular faces of the spacing pieces to secure the spacing pieces and the blades to the blade-carrying element.

' JOHN SNYDER; Witnesses:

CHARLES W. MCGHEE,

between the rows of blades E. W. MoC-AL IsTER.

regular faces "and a distortable calking piece