US950330A - Steam-turbine-cylinder lining. - Google Patents

Description

Patented Fab. 2.2, 1910.

E'. HODGKINSON.

STEAM TUBBINB CYLINDER 1.1mm

APPLICATION FILED 51332.12, 1908.

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j bladesandintcrnualiate1an-ingpieresina-:I- K mental blade rings. and providingy tneatr` l'or securingr the blade rings and also a pro- .ings,ol` which the 'followingis a specification,

Unrrnn STATES Piz-tireur opteren.

FRANCIS HODGKINSON, OF EDGEYVOGD PAT-.KA PENNSYLVATCIA. ASSIGNOR TO THE WESTINGHOUSE MACHINE COMPANY. .A CORPORATICN PENNSYLVANIA.

i or STEAM-TURB'INE-CYLINDER LINING.

950,330. Specification of Letters Patent.

Application filed June 12, 1968.

aten ted 'Feb serial No. 438.166.

To all :tf/tom iz' may com-wn:

Be it known that l, l"u.\ \f:1s llonoatxsolv. a Asubject ot' the King` ot' Great Britain and ireland, and a resident ot' Edgewood tark, in the county ot' Allegheny and tritate of l tion along 'the line ot' Fig. 1 .lennsvlvaniin have made a new and useful a plan view of a rotating4 blade-caraving elelnvention in Steam-Turbine-Lyiinller Linwenn to which blades are .secured in accordance with my invention; Fig'. l is a trans- This invention relates to tilading i'or elas- .ver. e ,section of a fragment of a stationaryY tie. tluid turbines, and also to meanslor .sei blatltr-carrying element ,embodying my inenring :t protective coveringy to the bladei ventina; and. Fig. 5 is a perspetive view ot' ero-vying .glement of the turbine, i a spacing piece, which forms a detail oi' my .tu object ol this invention the produc- Y ixneution. tion ol simple and eli'ective means for hhtdbladecarryin.;r element 3 o the turbine me turbines' in conjunction with means for i is provided with a plurality ot' hla-de-iitotint eti'cetiiely securing a protective covering for ing,r slots i'. in which blades b and intermethe blade-catryingr element in place on the i diate spacinvhff pieces St are assembled. llaeh element. blade is provided, near its base, with a hole X further objet-t i ttnprotluctitui or" simi 10. which extends transverseliv through it, ple and et'ective means l'or assembling the and @zich piece J iS provided with a hoie il, blades in segmental strips and ior rendering which extends transversely through it and the operation ot' renewingr blades in a turbine a simple matter.

The inner }.\etipheral fat-e of the :tatiolb ary ele-nient or casing ot' the turbine is req'jently corroded and pitted by the motive tluid of the turbine. 'the pitting of the caseation and forming' a part thereof: Figure l is a t1'::j }tnent'al section ot' a rotor or rotatingblade-carrymgr element` and discloses an elnregister with a hole of an adjacent blade 8 when the blades and pieces are assembled iu a blade mounting slot.

The blades 8 and the spacing pieces t) are, before the)Av are introduced into the bladeiug. and, in souleinstaxafes. ot' therotating carrying slot, assembled into segmental blmle-carrying element, results from an blade rings or sections by beingr threaded erosive and corrosive action which may he onto and Secured in place on a binding` wire the result of chemical impurities in the t2, which is adapted t0 extend through the boiler feed water, sut-iu for instance. as orholes 10 and 11 of the blades and pir-ce` rl ganir or inorganic acids. 1t may result speetif'ely. The blades and pieces. are alterfrom the corrosive action of the distilled nately arranged upon the wire and, if dewater, that is, the water of condensation, and the erosive action of the motive fluid and the water of condensation in their pas- Sage through the working:r passages of the turbine. Whatever the cause, the fact remains that the exposed surfacesof the wot-lt4 in;r elements are at time and amici-.certain conditions badly pitted and corroded... The east iron casini;r is usually more actively` ati tacked than the rotor element. but l con-i template providing' a protective covering` which mav be e'eeerivelv seem-ed to both the ing :if the outer or free ends of the blades. sialiot-tartz and rotaline' hirule-'-art' ving elei and through which ifie. tips lil of the bladl mentsof-a turbine, I are adapted to extend. Alter the channel is This invention contemplates assembling; l in place on the blades it is permanently Se- E cure-l to them b v riveting over eat-h tip i3. This construction in conjunction with the binding wire 12 permanentln'r assembles the tective covering for the blade-carrying ele. blades and spacing pieces into a segmental ment to that element. t ring.

In the drawings accompanying this appli- One wall of each blade-mounting slot 7 over to permanently secute them iu place. i Any suitable method may' be employed .for t assembling' the blades and pieces onihe wire. The. outer or free. ends of the blades are xach provided with a tip 13, whieh extends 4longitudinali` of the blade and which is adapted to secure a channel il onto the outer end of the blade. The channel l-t prt vided, in its web portion, with holes; lf

which is so Vlocated within the piet-e as to sit-ed, the ends of each wire may be riveted i which are spaced to correspond to the sparbodiiucnt of m v invention; Fie'. 2 is a seth i same side of the inclined face 1G. The lug 17 is so located on each piece 9 as to project i beyond the walls 'o the slot and to overhang the undercut Wall of the slot when the pieces are located in place in a slot. The other lateral face 18 of each piece extends at right angles to the top and bottom faces of the ieee and, when the pieces are located in a i slet 7, is normal to the peripheral 'face of the blademounting slot. After the blades and spacing pieces have i, been assembled into a segmental ring, the'i ring segments are introduced into the blademounting slots 7 in such a Way that the ini t at or near the top of each piece and on the t i elined lateral face of each ring, formed by the. inclined faces 1G of the intermediate pieces 9, comprised in each segmental ring, contacts with the undercut wall of the mounting slot. The rings are then secured in place in the lade-mounting slotby means of aealking strip 20, which is inserted in the slot between the faces 1S of the intermediate pieces E 9 and the vertical Wall of the slot. E Protective strips 9,1 are located between adjacent blade-niounting slots 'i' and are secured in place on the blade-carrying element by means of the lugs 17 of the spacing pieces 9 located in one slot and the calking piece 20 located in the nett adjacent slot.

The method of mounting the protective cated in the blade-mounting:r slot and is per- .ne nently secured in place in the slot by means of a eallting piece 2O which is calked into the slot and thereby forced into gripping contact with the vertical wall o the slot and which forces the inclined face oft the blade ring into gripping contact and' positive engagement with the undercut wall i of the slot. A blade ring is then introduced t into the next adjacent slot and a protective strip 21 is so located between the tivo adjacent. slots that one edge contacts with and is overhnnc by the lugs 17 of'the spacing:r pieces 9 secured into the tirst mentioned slot. i These spacing pieces are of such height that they project beyond the walls of thebladecarrying slots :in amount which is about equal to the thickness of the protective i, strips 2l, and the protective strips are beveled ateach edge. `Each calking piece Q0 is so constructed that when calked into the i l strips is as follows: One row ef blades is lol, i

l l i -blademounting slot, it will tion' around and str1 p 21. This construction secures the protective strips rigidly 1n place and prevents them from being dislodged by centrifugal i. l. i l engagethe adjacent edge of the protective i l. or any other dislodging force The pro-l tective strips are curved to correspond to the curvature of the peripheral face of the blade-carrying element and they are preferablt cut into sections for convenience in handling and mounting them on the bladecarrying element. Each section of a ring is so arranged at its ends that the sections may be inserted into the blade-mounting slotend for end without destroying the spacing of the blades in one annular row. It will be apparent that for convenience in handling, the calking pieces 2U may aise be introduced into the slots in short sections. Throughout this specieation and in the claims, I h ve utilized the terms blade and blades in their broadest sense; that is, to mean either the moving or stationary blades ofra turbine` The term blade-earrying eleneent has also been utilized in the broad sense, and means wherever it occurs either the stationary or rotating blade or bucket-carrying element of a turbine. I. therefore, wish it to be understood that I do not limit the scope of this invention to either a stationary or moving blade-carrying element of a turbine, and that the speciieation 1s broad enough to `include various and different kinds of blades and buckets.

En accordance with the provisions of the patent statutes, I have deseribedsthe prineiple of my invention together ivitii the apparatus which I now consider the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can he carried out by other means.

That I claim is: s

I. In combination in a turbinc,.a bladecarryingelernent provided `With a slot, a segmental blade-ring comprising blades, intermediate spacing pieces, and means for securing said blades and said pieces to gether, a protective covering for said cle ment and a calkiug' strip for securi g said covering and said blade ring to said clement.

n. In combination in a turbine, a blade carryinil element provided with a plurality of slots, blades and intermediate spacing pieces located in said slots, protective strips between adjacent slots` means formed integrally with cach spacing piece for engaging a protective strip, and a callting strip for securing said blades and said spacing strips intosaid slots and said protective strips to said element.

In testimony whereof, I have hereunto subscribed my name this ith day o? June, 19W.

FRANCIS HODGIINSON.

Witnesses:

CHARLES W. MCGHEE, E. W. McCALmsrnn.

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