US815973A - Steam-turbine packing. - Google Patents

Description

- To all whom it may concerns.

, UNITED STATES, ROBERT A. MoKEE,OF-1\HLWAUKEE, wIscoNsIn-AssmnoR TOALLIS- cnALMERs-coMPAnr, or MILWAUKEE, iscons n, A CORPOEATIQN on NEW JE EY.

rATEnT orrron,

. H E -Tommi: VPVAGJKYINGY.

' Be it knownthat I, ROBERT A. MoKEE, a

' citizen of the United States, residin at Milwaukee, in the county of Milwau es and State of Wisconsin, have invented certain.

new and useful Improvements in Steam- Turbine Packing, of which the followingis a "specification.

cient than that heretofore used.

The object of this invention is to provide'a steam turbine packing-which. is more efli- In steam-turbine packings it has been I usual to undercut the spindle-collars of the rotor and allow the portion beyond the undercut to coast with packing consisting of dummy strids of softer materialplaced cir cumferential y uponthe stator. The objection to this means of packing is that in preliminarily grinding the parts together a shoulder is worn upon the softer metal of the .dummv strips by the relatively harder spin-' dle-collar. This invention obviates thisobjection, besides securing other advantages.

The invention is more particularly described by reference ,to the drawings, in

- rFigure 1 isa vertical section through the turbine cylinder and spindle.

enlarged section through the packing. Fig. 3 1s a snnllar View of a modification, and Fig.

4 is a face view of one of the sectional dummy means of balancing there will consequently be several chambers under'different' pressures and between "said chambers must be placed some means for packing, so as to prevent the escape of steam from one chamber to another without doing work; Without showing all the details of the turbine, Fig. 1 shows two of these packings' 2 This pack ing 2 3 is provided by forming the rotor 41 with collars 5.

These collars are so shaped as to have one of their side faces 6 in a plane at right angles to the axis of the shaft. Uponv "the inner side of the casing or stator 1 are cir- ,cl.unferential grooves 7, in which are calked dummy strips 8. These dummy strips 8 are Specification of .Iietters Patent.- Application filed Rovember 21,1904. Serial No 233,632.

Fig. 2 is-an Patented March 27, 1806:.

dummy strips 8 are. made of a strip of soft metal, rectangularly shaped in cross-section, and have formed up on one of their side faces a thus firmly secured within thegroove 7. The

groove 9... Thisgroove 9 serves a double functron, 'as, first, it provides a shoulder 10, at which place the stripsare calked to hold them within the groove 7, as described, and, second,it profvides a coacting portion 11 beyond the' groove 9. This coactin'gportion 1 l coacts over its entire surface with thecollars upon the rotor i-that is, it extends within the outside di ameter of the collars? There will be sufiicient frictionresulting from calking to hold the dummy strlps 8 in place if the grooves. 7 are parallel sided. Iowever, the groove 7 may be undercut, as shown in Fig. 3. In this case when the strips arecalked', as shown at the right in this figure,

' the soft metal of which they are made all be forced into the undercut part of the groove,

and thus positively lock-the strips in place.

The dummy strips 8 are convenientlycut into short lengths before being put in place.

This will cause the dummy strip composed of. arcu'ate strips.

It will be observed that in the feliminary p p when in place to take the form of a sectional ring grinding the collars 5, being usua ly made of steel, will wear away the coacting portion 11 beyond the groove 9 in the-relatively softer strips 8, while the outer circumferential edge of the collar 5v under no circumstances can wear the shoulder in the dummy strip, be

.- cause it extends beyond the coacting portion 11 of the strips 8. It will also be noted that a greater stiffness for the same thickness of thestrips 8 is obtained than by the use of a 'coacting portion projecting beyond the base of the strip, because the'calking-tool is ap-- plied to theshoulder and not to the narrowest width of stock. Another advantage is the facility for calking. the strips, because of the shoulder 10 formed on them. The

construction is also cheaper than that neces-' sitating undercutting the collars 5 on there tor 4.

In accordance with the provisions of the patent statutes 1 have described the principle of operation of myinvention, together with the apparatus wluch I nowconsider to represent the best embodiment thereof; but

I I desire it to be understood that the appara- -,tus shown is merely illustrative and that the invention can be carried out by other means.

- 1.What I claim as new, and desire to secure by Letters Patent of the United States, is 1. In a turbine, a hard collar integral with the rotor, and a soft grooved circumferential coacting strip on the stator.

2. In a turbine, a collar on the rotor having its side face in a plane at right angles to the axis, vand a relatively softer grooved circumferential strip on the stator with the part beyondvthe groove in coactionwith the side face ofthe rotor-collar. v

- 3. In a turbine, a collar on the rotor havingja side face in a plane at right angles to the axis, and a relativelysofter grooved circumfere'ntial sectionalstrip on the stator with the part beyond the groove in coaction with the side face of the rotor-collar.

i p it In a turbine, a packing including a strip quadrilateral in eross section, and grooved, and a hard means coacting with tho grooved face of the strip.

5. In a turbine, a packing including a strip rectangular in cross-section, and grooved and means in which said strip is calked.

6. ln'a turbine, a packing including a strip

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