US1338708A - Steam-turbine - Google Patents

Description

A. A. E. STERZING.

STEAM TURBINE.

APPLICATION FILED JUNE 7. 191a.

Patented May 4, 1920.

ALBERT A. E. STERZING, OF NEW YORK, N. Y.

STEAM-TURBINE.

Specification of Letters Patent.

Application filed June 7, 1918. Serial No. 238,628.

f'b at whom it may concern:

P-o it known that I, ALBERT A. E. S'rnnz- ING, a subject of the King of Great Britain and. Ireland, and resident of the city and county of N York and State of New York, have invented certain new and .useful Imprwements in Steam-Turbines, of which the followingis a specification.

In my Letters Patent of the United States No. 1,281,2A, dated October 8, 1918, is described a steam turbineengine whereof the rotor and stator elements are each provided with concentric series of facial action and. reaction chambers constituted by z-shaped pockets having angularly-disposed inner wall oortions. those of adacent elements ber oppositely positioned in relation to each other, and said chambers gradually increasing in size from the inner to the outer series, whereby steam introduced to the inner series expands circumferentially and radially outward through the successive chambers, flowing in a sinuous course from chamber to chamber and exerting a turning effort on the opposing surfaces presented by the semicircular end walls of the succeeding series 7 of pockets. The curved end walls of the coordinated pockets of the stator 'and rotor elements deflect the steam in a smooth and easy path to and upon the angular inner walls of the pockets, and such walls during their relative rotation tend similarly to direct the steam continuously from and between opposing pockets.

In the use of low-pressure steam in my said engine there is liability of the formation of cross or eddy currents within the pockets during the travel of the steam therein, which condition, when occurring, impairs the efiiciency of the engine. The

object of my invention is to overcome the objection mentioned, and to that end I provide each of the pockets with a central longitudinally-extending division portion which terminates short of the curved impact end of the pocket and thus provides two chan nels which divide the steam into inflowing and outflowing currents as it passes to and from the impact wall, as will be hereinafter described and claimed.

In the drawings- Figure 1 is an elevation of parts of the stator and rotor elements of a steam turbine embodying my present improvement.

Fig. 2 is a transverse vertical section, as on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal section, as on the line 3-3 of Fig. 2.

Fig. 4 is a face elevation of a portion of one of the pocketed elements of the engine.

Fig. 5 is a similar view, showing a slight change in the form of the pockets.

F ig. 6 is a sectional detail of one ofthe end heads of the stator and the adjacent member of the rotor, showing a modified form of pockets. I

Referring to the drawings, 11 designates parts of the end heads, and 12 one of the pocketed partition members of the cylinder; said head and partition member constituting stator elements. I

l4 designates rotor members alternating with the stator members and keyed or otherwise secured to a central shaft 15. Each member of the stator and of the rotor (excepting the outer walls of the stator heads) is provided in each of its faces with a plurality of concentric series of ockets 29, those of each series being in uni .orm order of succession. Each pocket is :-shaped in face view, the curved wall (a) thereof constituting a steam impact surface. The inner wall (b) of the pocket extends angularly outward from the inner or basal part of its impact surface to the corresponding surface of the next succeeding pocket of the series, thus affording a continuous series of elongated steam reaction chambers having curved impact surfaces and angularly disposed directing surfaces. The angularity of the chambers in one face of the member is reversely of that of the chambers in the other face thereof, and the rotor and stator members are so arranged that the chambers in the adjacent walls of the respective chambers are in opposite relation to each other and bridge or overlap, the circular walls 30 which separate the successive series of concentric chambers of each face bridging the proximate complementary chambers of the adjacent face. (See Figs. 1 and 2.) The end heads of the stator are formed with angularly disposed reaction chambers in their inner faces only, but each of the internal members is provided with such chambers in both its faces, as above mentioned.

The steam admitted at the inner or central portion of the apparatus expands circumferentially and radially outward, flowing in a sinuous course from chamber to chamber and continuously exerting a turning effort on the opposing surfaces presented by the Patented May 4., 1920;

. parallel channels semi-circular end walls of the succeeding series of pockets, which pockets gradually increase in size from the inner to the outer portion of the apparatus in order to compensate for the progressive expansion of the steam, all as fully set forth in my previous application aforesaid.

According to my present invention 1 form in each of the pockets a central division wall 0 which terminates short ofthe curved impact end. of the pocket, so as to afford two which extend longitudinally of the pocket and communicate with each other at the impact end of the latter. Thus thesteam in its course through and from each pocket flows along the inner channel to and against the impact wall and is thereby deflected into the other or outer channel of the pocket (as indicated by the arrows in Fig. 4), whence it continues its 1 outward travel to the pockets of the succeeding series. The steam current is thus partitioned in its passage through the several pockets, thereby obviating liability of cross or eddy currents within the main portions of the pockets, particularly when the steam is of low pressure.

In Figs. 5 and 6 I have shown adjacent portions of the impact surfaces of the rotor and stator members, respectively, as provided with lateral lips d which are designed to restrict to some extent the lateral How of the steam.

I claim V In a turbine engine, the combination with a stator element having concentric series of facial reaction chambers constituted by zi-shaped pockets having angular inner walls, thereby presenting curved impact and pressure surfaces and angular directingsurfaces, said pockets also having division .walls extending longitudinally thereof and

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