US1654896A - Exhaust-steam injector - Google Patents

Description

Jan. 3, 1928.

' E. RAWsoN EXHAUST STEAM INJECTOR INVENTOR. EMANUEL RAWSON m W` w m &

f' ATTORNEY.

Jan. 3, 1928.

E. RAWSON EXHAUST STEAM INJECTOR eets-Sheet 2 Filed Jan. 28,l 1926 INVENTR. EMANUEL RAM/50H A TTORNEY.

to inodiiication of -thevalve illustrated in Fig.

, EMNUEIQSRAWSQN, 'on Jn xH5 calfeget. al.1,asA adaptedto/be operated =by ,compania voir NEW1-'fvo1ix,.1v..v.

Rszv o1TY,.N,EW grnnsnxifisslsuonrro,.SUBERHEATER *Eliminer-STEAMrmncron.'

Application -le {anuary ThefpreseuitV invention*A relates to exhaust steam-fjinifectorsfV andcliis particular r `refer- -ence'to the type disclosedv iin U1 S. -Pa-tentNo.

1,342,128, -njranted .June 1, 11920 "to J. v l-'Met- `11i-plied: to loccmotives', the injector may be opeiatedxizeither by 'exhaust or live steam, as engrine- 'conditionsdict-ate, andI the several 'e steam supply v conduits` leading tof the -f injector are 'controlledby-luid actuatedfvalves which :are-in fturn-controlled from `the cab by theienfgineer;nlnforder to secure proper "controlofitlie injector,`it is necessary that -the exhaust steami inlet fbe valved so lthat it 1 4tbe closedi at the will, ofthe'` operator, and it isvturth'ermore necessary that this valve should close 4aga-inst a positive pressure .within the` inj ector,v inn-order to prevent the :passagev ofilive vsteam-into the exhaust steam lcfmdiuit' Wlienxthe injectoris being operated iv-hollyiby live steam. f -i A il number f offvalves have heretofore -been -sugafested:I :for f `this purpose, but* because 'ol' Y vthe widelyxfacying steam conditions on both sides of the valve Vunder diierent injector 2opeiwtin conditions, p thef operation of the priorI :valves 'has been:l unsatisfactory.

The principal object of the present invention is thereforeltheprovision Otan im* proved term ofexhauststeam valve, which may be fremotely controlled, which will" effectively closefthe"exhaust Vrsteam conduit Vagnimst awlivesteam pressure within the 1n- Y iector, lancl'\vlii'c h will :operate smoothly and efficiently underfall lsteam conditions which may exist Within'ltheinjector. 'Further and more detailed Vobjects of lthe l inventionv Will i appris-iras vthe .following description, which is tobeftalren.inconjunction Withthe ac` ccmpanyinqj drawings, proceeds. lathe drawings, Fig. l is avertical section Vtaken ythrough the *center* line l ofan injector ot .the f .type hereinbetore referred to", towvhich, a 'valve'embodyingI the inven-V tionahas beenapplied. Fig. 2 is a `fragmentarvsection' similar to 'Fior l, showing a 1. Fig. .3 auvieiv'siniilar to Fig. 2, showing` another' 'imodiicaltionot `the invention, and' Fig. l is a section taken-on the lineal-#Jl o.-5`ig.1f.-- {Figi-:5 :is'alragmentary View` 28;",1926l Y#aerial No; $4,472. l

,similar to'lFig-- l, showing anotherform-fdf .valve appliedfto* the injector; e alliddig.V Gkis" 'l' isha `fragmentary"section onfailagrger ue; taken along-the lfmei-#T (3f-Fig; (5s-md Fig. 8 Aal transverse seetionalso v on a larger zi'scctionhtaken 1onfthe lined-Goff Figf.

@do Y p ileitlrenfalong.thelineffoffFig. 6.*

.aina-in housing or'ca'singt formedr'by K combi-ning tube -Gand thefdeliveryllnozle`7, l

:wh ich 'discharges by1Wayjolithepassage and :check valve -9f intothe; pipe ll0-'le,adii'rgi to fthe boilercheck valve.'l inasmuch 'asjthis portion of i thetappar-atus' is a. ``linovv/"ifi form, it -Y is-not believedv necessary; to describe itin Yany furtherdet-ail. is s is `lusual in this-:type io'ffinjector, *the housing -l is extended `and-f'enlarged i beyond Y the inlet end-ot A`nozzle-3 toformV 'afst'eain` chamber ll', lto Iwhich isdelivered 'itheriex- Ahaustf ori live steam,depending'uponthe5 Y, yecto@` operating l conditions-,13 forfsupply-ing ini communication ,byway rif/portl lpivvith'" any suitable source t'or'l live I 1 steamv lsupply which may; be remotely controlled through* al m e'chanismA such vas I' that described Patent 53l,004, hereinbefore; l referred v'-"to iglrf press-ure f liveflst'eam,x *hereii'iafterfre tei-red to asl ""supple'mentlt l steam, issup-rv plied by *suitablycontrolled nrcan`s,fnotkv used, control means mustbefprovidedgirnthe Y exhaust lsteam inlet to the '-inj-ectornot only im, Y

y ico i Vshoivnuto thesupplementallsteambnozilel Y Y control means in the form of a fluid actuat'ed valve of novel construction, which is substantially balanced in either closed or` open position, regardless of the steam conditions existing in theinjector. As shown in Fig. 1, the exhaust steam inlet 121s in Vcommunication with the steam chamber 11 by Way'of `a cylindrical` extension 19 ot the latter, and-in this extension there is slidablv 7mounted a hollow sleeve valve 20 betWeeh Which andthe injector casing l, a steamtight joint is maintained byV means or" suitable packing rings 21. The internal Webbing of the injector housing, which forms the steam passages 14 and 17 land a support for thel nozzle 16, is extended to form an open-ended sleeve 22 centrally aligned With the exhaust steam inlet 12. `The sleeve 22 is internally threaded to receive an annular valve seat member 28, having la face 24 against which the end face of valve 21 seats when the latter is in closed position. The valve 2O is provided with radially extending arms 25 Which support centrally of the valve a stem 26, to the end of which is secured a piston 27 slidably mounted Within the central annular portion of the member 23. The latter is provided with an annular face 28, Which serves not only as a stop limiting the open position of valve 20, but which, When-,the valve is in open position, forms with the piston 27 a steam-tight joint closing one end of the cylinder formed lby the central portion of the member 23. The other end of this cylinder is formed by the plug 29, and a passage 30 cored out of the supporting Web formed in the injector housing connects the cylinder With conduit 3,1 leading from a suitably controlled source of fluid pressure. A helical spring 32, rest- 'A ing at one end against the arms 25 of valve 20 and at the other end held by the annular backing ring 33, Which is suitably secured inthe injector housing, serves to hold the valve 20 normally inV closed position, as indicated in F ig. 1. When desired, valve20 is opened by means of fluid under pressure admitted through conduit 31 and passage 30 and'acting onpiston 27 Yto move the latter, and with it valve 20, to the right. InV

order to reduce the friction incident to moving -the valve and also the number of parts,

piston 27 is not provided with packing rings, but leakage past the pistonl When the latter is held in open position by fluid pressure, is prevented by the piston 27 seating against the annular face 28.

With the valve in the position shown in Fig. 1, communication between Ythe steam chamber 1.1 and exhaust steam inlet 12 is out off and the injector may be run by aux- 'p valve is' opened.

stantial balance also lholds true regardless iliary live steam admitted through the steam passage 14. It is tobenoted that under these conditions, the live steam lilling the chamber 11 exerts no pressure tending to open or' close valve 20.y this feature'being of importance, as a comparatively light spring issuicient to keep the valve in closed position. Because ot' the light spring which it is possible to use vWith this construction, thc operating piston 27 and its cylinder may be comparatively small and it is possible toV locate them in the mostv advantageous posi` tion directly Within theinjector Without unduly restricting the Vsteam passagev therethrough. Moreover, when exhaust stea'm'is admitted through the inlet 12 Withthe valve in closed position, the steam pressure exerted on the valve isfsubstantially balanced and this condition continues veven after the This condition of suhof the presence or absence of live steam in thechamberll, so that under all operating conditions the force tending to close the vvalve is substantially the same-that is, the force `exerted by the-spring .32. Due to the uniformity of force required to be overcome by piston 27 the action of the valve in opening andclosing even and smooth, and the shocksdne' tothe sudden application of unbalanced forces tending-to throw the valve violently to either closed or open position and resulting in strains and damage to the valve mechanism are avoided. As Will also be apparent from the figure, this valve construction also permits oflarge and compara-v tively unobstructed stcam passages connectchamber 11.

In Fig. 2 there is illustrated a second Jform of valve, in Which the general construction is similar to that just described but in ing` the exhaust steam inlet 12 vwith the e ivhich the spring arrangement for closingthe valve-.has been slightly modified. in this form the -sleeveportion of the valve 20a is spacedy from the injector 'housing 1 and a shoulder 20"'is provided on the valve, serving as a stop for one end oilV the spring 32.y which is locatcdin the annular 'space loetiveen the .sleeve portion of the valve 'and the injector housing.` As in the form previonsly described, the other end-oitI the springllt) is held by a backing ring 33 fixed in the 1nt ing ringand serve to form a steam-tight1 surface oi" the sleeve portion exhaust steam inlet l2 is effectively closed.Y

As will he readily apparent .from the iigure this. valve construction is essentiallyV the the arms 47 enables the valve to be substanf tially supported at two points, and as will readily be apparent, this additional support may be provided in the valve forms shown in the preceding figures.

It will be obvious from the 'foregoing description that the present invention may be j embodied in many different forms, and it is to be understood that the forms herein shown and described are to be taken as illustrative and not limiting in sense, and that many variations and vmodifications may be made within the scope of the invention as defined in the appended claims.

lVhat I claim is: f

1. In anV exhaust steam injector, an exhaust steam nozzle. a chamber communicating therewith having inlets supplying exhaust vand live steam thereto, and avvalve located in said chamber intermediate said inlets for closing communication there between, said valve being substantially free in all positions fromv unbalanced pressure exerted by steam from either of said inlets.

2. In an exhaust steam injector, an exhaust steam nozzle, a chamber commiinicating therewith having inlets supplying ex-` haust and live steam thereto, a valvelocated in said chamber intermediate said inlets ,tor closing communication there-between, resilient means acting to close said valve and fluid pressure actuated means ttor openinging therewith having inlets supplyingex-V haust and live steam to saidchamber, va valve located in said chamber yintermediate said inlets for closing communication therebetween, said valve being substantiallyfree in all positions from unbalanced pressure exerted by steam from either ot .said inlets, a spring acting to close said valve,v and a luid pressure actuated piston for opening.

said valve against said spring.

4. In an exhaust steam injector,a housing forming a steam chamber having live and exhaust steam inlets, an annular valve seat mounted in said chamberV intermediatesaid inlets, a sleeve valve mounted in said chamber and having an end face engaging said seat to close said exhaust steam inlet, resili?.

ent means acting` to close said valve, and fluid pressure means for opening it. Y 5. In an exhaust steam injectonthe combi'- nation with a housing forming a steam chamber having live and exhaust steam inlets and carrying an annular valve seat and a cylinder arranged concentrically ot said seat; oli a `sleeve valve having an end tace engaging said seat to close said exhaust steam inlet, a`

6. In an exhaust steam injector, the combination with-a housing forming asteam chamber having live and exhaust steam inlets and carrying an annular valve seat and a cylinder arranged concentrically of said seat; of a sleeve valve having an end tace engaging said seat tov close said exhaust steam inlet,

a. piston mounted on said valve in alignment f therewith and disposed in said cylinder, a

valve seat within said cylinder at one end thereof, and a tace on said piston engaging said last named seat when said valve fully opened position.l

7. In an exhaust steam injector, the com! is in' bination with a housing forming a. steam f chamber and having an exhaust steam inlet'r therein; of an annular valve seat mounted-in said housing transversely of said inletsand concentric therewith, a'sleeve valve slidably engaging said housing and having an end face engaging said seat to close said inlet, a helical spring vmounted within said valve sleeve and actingto .closesaid valve, and- Openingk fluid pressure actuated means: for said valve against said spring.

8. In an exhaust steam injector,

the comf A bination with a housing forming a steam chamber having an exhau'st'steam inletl .sur-x rounded by an annular recess, of an Vannular valve seat mounted in said housing` transversely of said inlet and concentric there with, a sleeve valve slidably mounted insaid recess and having an end tace .engaging said seat to close said inlet, a spring located in said recess acting to close said valve, and

fluid pressure means tor opening said valve against said spring. I

9. In an exhaust steam injector, thek combination with ahoiising forming a steam chamber and having an exhauststeam inlet therein, of an annular valve seat mountedfin said housing adjacent said inlet, a sleeve valve slidably mounted in said housingl and having an end tace engaging said Vseatto close said inlet, said valve being constructed and arranged sothat steam entering said chamber from said inlet flows through said valve, resilient means acting to ,close said valve, and fluid pressure means for opening said valve against said first named means.

10.1'In an exhaust steam injector, the combination with a. housing forming a steam chamber and having an exhaust steam inlet therein, ot a sleeve valve mounted transversely of said housing and. acting to close said inlet, resilientv means actingto close said valve, and fluid pressure means for opening said valve against said iirst named means,

said valve being constructed and arranged 1,654,896 I Y B f so that when in open position it lies outside Y ports therein aording the sole communication' between said inlets, an annular valve Seat formed in said web between said ports, a sleeve valve slidably mounted within said web and having an end face engaging said seat to close communication between said ports, a spring mounted Within said web for closing said valve, said valveV and spring being removable from said housing through said web7 and fluid pi'essure actuated means for opening said valve. j Y

l2. In an exhaust steamY injector, the combination with a housing having an exhaust steam inlet,'of a pair of annular valve seats mounted within said housing adjacent to said inlet, a double-seated sleeve valve slidably mounted within saidhousing and engaging Said seats to close said inlet, resilient means acting to close said-valve, and fluid pressure actuated mean for opening said valve. Y

13. In an exhaust steam injector, the combination with a housing having a cylindrical extension terminating in an exhaust steamy inlet; of a valve seat member mounted in said housing, said member comprising apair of spaced annular valve seats-located transversely of and' concentric with said exten-` sion, a double-seated sleeve valve slidablyl mounted in said extension and engaging said valve seat to close saidinlet, resilient meansV for closing saidvalve, fluid pressure actuated means for opening said valve, said valve bef v ing constructed and arranged to form when in open position a steam passage through the vvalve and a second annular steam passage between the valve and the extension of said v housing.

14. In an exhaust'steam injector, the combination with a housing having a cylindricaly extension terminating in an exhaust steam inlet; of a` valve member located in said housing adjacent said inlet, -said member comprising a pair of spaced annular valve seats located transversely of said inlet andV concentric therewith, a cylinder mounted concentrically of said valve seats, a ported Vbacking plate mounted in said inlet and ghav-V ing a Vbearing in alignment with said cylinder, a double-seated sleeve valve having a stem mounted at one end in saidY bearing and terminating at its opposite end in a piston slidably mounted in said cylinder, ya spring v mounted between said valve andsaid backing plate for closing said valve, and means for supplying fluid pressure to said cylinder to actuate said piston and said valve.

EMANUiaLlRAwsoN. i,

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