US1091078A - Extracting steam from steam-turbines. - Google Patents

Description

I. E. NORTON. EXTRAGTING STEAM PRO-M STEAM TURBINES/ APPLICATION FILED JAN.11, 1913 s sums-emu 1.

Stage Dr'essu re 0 To Condenser- Witnesses:

' Inventor. Fred E. Nor-ton,

bgm'

aqttg.

Peitent'ed Mar. 24, 1914 V RENORTON. BXTRAOTING STEAM FROM STEAM TURBINES. APPLICATION FILED JAN. 11, 1913.

1,091,078, Patented Mar. 24, 1914 a SHEETS-SHEET 2.

Fig.- 2. v

Inventor,

F'red E.Norton,

RB. NORTON. EXTBAGTING STEAM FROM STEAM TUBBINBS.

APPLICATION FILED JAN. 11, 1913.

1,091,078. Patented Mar.24, 1914;

a sums-5111:2123;

Fig. 3.

. W I 7%- IM & H \A Witnesses:

V F EInven tor: I red .No ton,

UNITED STATES...

FRED E. NORTON,

F LYNN, MASSACHUSETTS, Assisivon 'rofsn'itm gi. Eifid gfiic C N COR-PORATIQN OF NEW R j A w ExTitAcEriivG STEAM- FROM STEAM-TURBINES.

Specification of Letters Patent. Pa'ten'ted M 'To (ill teli o'zn i tjinay concern. a? v Be-1t known that I, FRED E. Nonrox, a citizen of theUnited States, residing at Lynn,,count y of Essex, State of Massachu-l setts, have invented certain new and useful Improvements in Extracting Steam from Steam-Turbines, of which the following a specification. I

This inyention'relates to steam turbines from which steam is extracted for industrial purposes after passing through one or more iigh pressure stages of said turbine. The amount of steam so extracted is liable to vary considerably from time to time, so that it is necessary to provide means for regulating the flow of steam through the turbine in order to maintain an approximately uniform pressure in the stage supplying the industrial appliances. The present invention has especial reference to mechanism for effecting such regulation. It comprises a valve.

controlling the passage of steam from the extraction stage of the turbine to the next stage of lower pressure, a motorfor operating said valvej a movable abutment exposed on one side to the pressure of the steam in the extraction stage and on the other side to 'low or condenser pressure; a spring opposing the movement. of said abutment, and a pilot valve for the motor controlled by said movable abutment .VVhen the pressure in he extraction stage rises high enough to overcome the tension of the spring. the abut- .s ment moves and shifts the pilotivalve to ad- 35 mit fluidpressure to the motor,.wh ich opens the valve between the stages andallows some of 1th-;'steam-to overflow into the next stage. This ."reduces the abnormal pressure in the extraction stage; conversely, ii the extraction stage pressure drops too low, the motor will close the overflow valve and retain the steam in' the extraction stage which causes its pressure to rise. In this way, a substan- --tially constant pressure is maintained in the extraction stage.

' -111- the accompanying drawings, Figure" 1 is a side elevation of one end of a horizontal turbine equipped with my invention: Fig. 2 is an end vie\v,-partly broken away; Fig. 3 is a vertical section lengthwise of the .motor and its valve mechanism; Fig; 4 is a horizontal longitudinal sec- I tion'of the pilot valve on the line 4-4.-,

' 3; Fig. 5. isa longitudinal he on;

Ihaust pipe 22 tion of the turbine on the li'ne; and Fig. 6 is a crossese valve but ona larger, scale.

The turbine casing l-zhajSa eh Pre ure- Steam-chest 2 s he ii'sualfl i hp essure nozzle valves 2;, which 21; cont by suitablevalve gear. notnshoivn Tl as in has an outlet 3, Fig.2, fro ma highipres sure stage, preferably -the first, saidoutletil ing preferably cast integralj vithgsaid casi' g, in

and connected to a conduit QOn \,*,eying steam from said-stage to an .industrial appliance such as :a heating system, i M cooking device, or the like. extracted through-.- the} I r H through'the lower stage 5-,, Fig. tiIlOf the tum. bine to'the condenser conduitfi i the main shaft 7 are-;;mounte a v vheels 8 and 9; the turbine illustrated @b; ing a two stage machin The inventionsis applicable, however, toarbinenumber of stages.- v V ;jr n 'An annular flatfaced ridironIvalvellIO controls the overflow of st m froni stage to stage 5, and isrevoluble in"; rahbeted ring 11 secured'to the ,-di' aph1 agni .hiQh 39 separates the two stages and. up 'o s the nozzles 13 forFthe lower press re g. The overflow" valve is operatedijb -o 1;=14 ;1 med thereto, preferablyifby aj ban-and. socket joint- 15, Fig. 2. Theaojd 14 t ton'rod for a motor, is st of a piston 16, Fig. 3, 17 secured to a fiangelS Fluid pressure, preferabl I steam chest2, is adniittedzto. he 1' by a" pilot valve operating; which is preferably castgi-ntegri cylinder. The steam enters 1* Q the casing through a pipe :21v exhausts from the other is le througha 22 to the condenser .condt A plug 23 fills the interior o the c; g It has in one side a .poit 6. .4; ig. Mad

ting steam from the pipe=n212to3its interci- The opposite, side of theip-luggisflattened at '25 for a portion of it-s-ilen'gth and ha vo ports 26,126 at}theends -,of--=said; ,p0r on entering the internal bloreof l c tweenthes e portsa poirt fi n- I nects, the-cutaway 'portion it x- I Near: each-en i 11161301 Y r i 32 which-is-pivoted to a floating lever 33- cylinder 17 are admission and exhaustports 28, 28 which communicate with ports 29,

29' in the plug 23. A pilot valve having a stem 30 and two heads 31 thereon plays in the'bore of the plug andfcontrols theports 29, 29. The stem, 30 is attached to a block fulcrumed. at one end to an arm 34 onan extension 35- ofthe piston rod 14 of the ,such "as a piston 38 attached to the rod 36.

, justled. A pipe 42 from the extraction stage (mth1s case the first) conveys the stage pressure to one side of the piston 38 and.

A. helical spring 39. abuts at one end against a shoulder on the casing and at theother end against a. collar 40 on the 'rod 36. A- nut 41 meshes with screw threads on said rod and. bears against the collar. By rotating said nut, the tension of the spring can be adtends to move it in a. direction opposite to that in'wl ich the spring 39 biases it. From the space on the other side of said piston a pipe 43 runs to the condenser conduit 6,.

of steam in the first stage 4 of the turbine The operation is as follows: The tension of the spring 39 is adjusted by the nut 41' so that it will balance the desired pressure from which steam is extracted through the outlet 3 for industrial purposes. Now suppose the demand for such steam lessens. The stage ressure rises, the abutment 38 -moves' (to t e right in Fig. 3), compresses the spring 39, and forces the lever 33 and the pilotvalve to the right thereby uncovering the ports 29 and 28 an admitting steam frornthe pipe 21 to the right hand end of the cylinder 17: This drives the piston 16 tothe leftand pulls the annular valve-.wider open, so that a larger quantity of steam can overflow from'stage 4: to stage 5 and thus reduce the abnormal pressure in stag-e4. In

opening the ports 29 to steam the pilot valve connects the ports 28, 29 with the port 26,

the cutaway portion 25, port 27 and exhaust pipe 22. The movement of thepiston is communicated by the'rod 35, arm 34: andlever 33 to the pilot valve, drawing the latter back to its mid position and thereby cutting off the supply of steam to the cylinder 17, and locking the-piston'16 in its new position. It will thus be seen that the parts 33, 34; and 35 form afollow-up device. If

the pilot valve has not moved very far, the piston '16 will be arrested before it has shifted very much from itsformer position.

If it should move to the end of its stroke,

it will close the port 28' before it arrives at the end of the cylinder, so that a body of steam is trapped between the-piston and the cylinder head and cushions the piston, preventing it from slamming. An increase the demand for industrial steam will produce an opposite efiect, causing the motor to partly or wholly close theoverfiow valve in order" to retain the steam in stage 4 and keep up its pressure.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, toget er with the apparatus which I now consid r to represent the. best embodiment-thereof; but I desire to have it understood that the apparatus-shown is only illustrative, and that the invention can be carried out by other means.

Whatl claim as new-and desire to se-' 1. The combination iwi-th a multistage turbine, of a conduit -for,e'xtracting steam from a stage of higher pressure, an annular overflow valve between said stage and the one next lower, a motor tor-opening and closing said valve, and means-responsive t0 the steam pressure in said extraction'stage for controlling said motor for the purpose of maintaining constantpressure in said stage.

2. The combination with a multistage. turbine, of a gridiron overflow valve be tween stages, a motor for operating said .valve, a pilot valve controlling said motor,

a movable abutment for actuating the pilot valve and exposed. to a higher stagepressure, a spring opposing said pressure on said abutment, and a pipe opening out of said higher stage for supplying steam for industrial purposes.

cure by Letters Patent of the United States, Y

3. The combination with a multistage turbine, of an annular valve revoluble on a diaphragm and controlling the flow of steam to a lower stage, a motor for operating said valve, apilot valve for said motor,

apipe connected to a stage of higher pressure through which steam flows, and a device responsive to variationsin steampres sure in said stage of highenpressure for,

controlling said pilot valve.

4. The combination with a multistage turbine, of a conduit for steam connected to a stage of higher pressure, an annular valve controlling ports between said stage and the next lower, a piston motor for actuating said valve, :1 pilot valve. controlling. sai motor, a piston working in.a cylinder and exposed to the pressurein said-higher stage, a spring opposing said pressure, and a floating lever pivotally connected to the piston pilot valve stem and the movable element of the motor.

5. The combination with a multistage turbine, of an annular gridiron valve revolubly mounted on a diaphragm between two stages and controlling the flow of steam to the nozzles of the 'nextlow'er stage, a conduit extracting steam for industrial pur- *weim poses from the higher stage,and. means re 1 spons'ive to.the pressure in saidhigher stage for opening and 'closingsaid-valver t-herotor-o'f lower pressiire, a motor, a connection between the movable part.0f theif 6 A turbine comprisinga casing that is dlvided by a' diaphragm into stages of different pressures,.rotors for the stages, de-' avconduit'extracting steam from the stage of higher pressn-re,' a' valve' that controls a number of-thenOZZies admitting steam to motor and the "valve, a pilo'tvalve for the motor, anda device responsive to the pressure in the extraction stage for moving thepiiot valve. v I

r 7. The combination with: a multistage' turbine, of-a conduit for extracting steam from a stage of higher-pressure, an overflow val've between said stage and the next lower," a motor for operating. said valve} having a. piston and piston rod, a lever pi'v:

otally connected to the piston rod, a pilot valve for said motor having its stem pivoted to said 1ever,.a1'1d a movable abutment piv-' otally iconnected to .the end of said lever and responsive to variations insteam pres 7 sure in the extraction; stage.

j .8wThe combination with .a multistage turbine; of a -eonduit forextracting steam I V from 'a' stage of. higher pressure, an over-' v ces admitting-steam to the said rotors,"

flow valve between said .stage and the next lower, a motorfor operating said valve "having a piston and piston rod, an extension of said rod passing through the head of the motor cylinder, anarm on said extension,- a leverfulcrumed on said arm, a pilot valve for the motor' having it's stem pivotall'y connected to said lever, a movable abutment pivotall-y connected to the end of said lever and e'Xpose'dto the steam pressure in the extraction stage,' and yielding means for opposing said pressure. I In witness whereof, 'I have hereunto set my hand this ninth dayof January, 1913.

' FRED E. NORTON.

I Witnesses:

JOHN A. MoMAN-Us, Jr.,

' JAMES I. MINKLER.

Images