US875644A - Steam-turbine. - Google Patents

Description

PATENTE D DEC. 31, 1907.

G.P.BARTH. STEAM TURBINE.

APPLICATION FILED APR.9,1906.

WITNESSES: INVENTOR ATTORNEY.

UNITED STATES PAT Nro nroE,

(JHA RLES F. EARTH, OF MILWAUKEE, WISCONSIN, AS SIGNOR TO AliLlS-OHALMERS COMPANY, OF MTIAVAUKEE, WISCONSIN, A'GORPORAI lON OF NEWJERSEY. I

STEAM-TURBINE.

' Specification of Letters Patent.

Patented Dec. 31, 1907 Amman an A ril 9.190s. Serial n siaesa.

T all Quiz-omit may concern." I

new and useful Improvements in .Steam- Turbines, of which'the following is a specification.

My invention relates toelastic fiuid turbines, more particularly to steam turbines, and its dbject is to'provide a simple means for securing together the ends of the battle" strip which surrounds and is secured to the vanes or blades of both the rotating drum and the stationary casing.

The present invention relates particularly to extending the web-of the channel shaped baffle strip. beyond the flanges and offsetting it so that the adjacent end may overlap and produce an even joint, 1

Referring to the accompanying drawings" which form part of my specificationz-Figure 1' is a side elevationofi a portion of the vanes or bladesand showing my improved bafiie joint in section. Fig. 2 is a plan view of the parts shown in Fig. 1, but on a larger scale. Fig. 3

I is a perspective view of the end of the baflie section shown to right of Fig. 1; and Fig. 4 is end view of the section shown in Fig. '3.

The drawings illustrate my invention as applied to the rotor-blades of a steam turbine, but it is evident that it is e ually applicable to the stator-vanes, and also that it is applicable to various types of compressors and pumps having vanes or blades ofla'nydesired shape in. cross-section, and that the blades may be secured to the rotors or stators in any desired manner. The baffle strip 5 is preferably channel-shaped, having a web 6 of approximately the same width as the row of vanes or' blades 7, and having flanges 8 at any desired angle to the web portion. The vanes may be secured to the baflle strip .in any suitable manner, bu t they are preferably secured by cutting away a portion of each vane near the end so as to lcavea shoulder and extending the reduced cnd' through corresponding openings in the web of the baffle strip and riveting over the extending ends, as clearly shown in Figs. 1 and 2. The baffle strip 5 is preferably. made up of sections and my invention relates primarily to the jacen't sections together.

baflie strip has the web portion 9 thereof e'xtending a short distance beyond the flanges and ofiset toward the vanes or blades. The

otherend of the baflie strip laps this offset portion and the flanges of the meeting ends contact to form an even seam. 4 The blades or vanes 10 coming adjacent the oint are cut away to a larger extent and their reduceth ends are used, not only to hold the bafile strip in place, but also'to firmly bind the lapping Prefer-- ably the ends of the sections of the-baffle portions of the sections together.

strip arecut atan angle, as clearly shown in Figs; 1 and 2-, so as to prevent steam from blowing through. Insome cases it may be found advantageous tojiarrow the web and offset it to lie beyondt'he web of the adjacent .end and between the flanges. This would have the advantage of better keeping the ends in alinement. and would'allow the vanes to be all'the samclength; but the tenons of the vanes at the joints would in that case extend beyond those of the other blades where they would be first affected as the flanges wear down, and. this is one of the main defects to be overcome by the present invention.

the attaching rivets lie in the same unbroken line, that is, they are all equidistant'fr0m the roots of the blades. If the side flan es wear toan extreme extent, the rivet hea s would all be equally and simultaneously afi'ected.

Although my invention is shown as applied to a parallel flow turbine, it is apparent that it may be applied to a radial flow machine.

Having thus described my'invention, what I claim as new and desire to secure by Letters Patent, is,

1. The combination of a plurality of blades, and adjacent bafiie sections secured thereto, one end of one of said sections being off-set and lapped by the end of the adjacent section. 3. The combination of adjacent battle sec- It will be noted that in the form illustrated 'apped by the web portion of the adjacent tions extending with their body portions end to end and in the same continuous surface, one of said sections having an extension lapping the adjacent section, said sections and extension having apertures, the apertures in the extension registering with apertures in the adjacent section, and blades having portions extending through said registering apertures, said portions having heads beyond the sections.

4. The combination of adjacent baffle sec tions extending with their body portions end to end andin the same continuous surface, theend of one section beingdisposed at an oblique angle to its side edges and an end of the adjacent section being correspondingly formed for close abutting thereto, one of said sections having an extension lapping the adjacent section, said sections and extension having apertures, the apertures in the exten sion registering with apertures in the adjacent section, and' blades having portions extending through said registering apertures, said portions having heads .beyond the sec-' tions.

5'. The combination of a plurality of blades, and adjacent baffle sections secured thereto each comprising a web portion and flanges thereon, one end of one of said baffle sections having the web portion extending be yond the flanges and being off-set and lapped by the end of theadjacent section.

6. The combination of adjacent baflle secin re istering'perforations, and a plurality of la 'es hav ng their ends of recluced'cross- Y correspondingly fornie section for passing through said perforations for riveting,

'lapping the adjacent section on the side towards the said blades,

8. The combination of a plurality of adj a- .cent bafiie sections extending with their body portions end to end in the sa1i1econtinuous surface, the end of one section being disposed at an oblique angle to its side edges and an end of the ad'acent section being for close abutting thereto, one of said sections having an ex tension lapping the adjacent section, said sections and extension having apertures, the apertures the extension registeringg-with apertures in the adjacent section, and lades having projections extending through said apertures from one side of said sections, said extension lapping the adjacent section on 't he side towards thesaid blades.

In testimony whereof Iafiix in presence of two witnesses.

EHARLE S EARTH.

my signature Witnesses Jenn DAY, Jr G. F. DE WEKN.

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