US1282595A - Fluid-compressing apparatus. - Google Patents

Description

G. L. KOTHNY & R. SUCZEK. FLUID COMPRESYSING APPARATUS.

APPLICATION FILED JULY II. ISI?.

3 SHEETS-SHEET I.

Patented Oct. 22, 1918.

GWW...

G. L. KUTHNY & R. SUCZEK.

rLuln coMPEsslNG APPARAWS.

APPLICATION FILED JULY l1. |911'.

Patented Oct. 22; 1918.

3 SHEETS-SHEET 2- (4 anotan,

G. L. KUTHNY 6L R. SVUCZEK.

FLUID coMPREssmG APPARATUS.

APPUCATION FILED JULY H. i911.

Patented Oct. 22, 1918.

llm'm" A Elftor ne 1.1

UNITED STATES PATENT OFFICE;

GOTTDANK L. KOTHNY AND ROBERT SUCZEK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOBS T0 C. H. WHEELER MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FLUID-COMPBESSING APPARATUS.

Specification of Letters Patent.

Patented Oct. 22, 1918'.

To all 'whom it may concern.'

Be it known that we, GoTTDANx L. Ko'rHNY and ROBERT SUozEK, subjects of the Emperor of Austria-Hungary, residin at Philadelphia, county of Philadelphia, tate of Pennsylvania, have invented new and useful Improvements in Fluid-Compressing Apparatus, of which the following is a speciication. l

Our invention relates to apparatus for compressing fluid, such as air, gas, vapor, or a mixture of any of them, and involves the ejector principle in accordance with which a mot1ve fluid, such as steam under pressure, is allowed to expand and entrain the fluid to be compressed, the mixture of the fluids being delivered into a diffuser and discharged therefrom at a pressure higher than the initial pressure of the fluid to be compressed.

Our invention resides in ejector apparatus wherein a jet of motive fluid issues in a sheet i'n the form of a disk, cone, or other suitable shape, from a nozzle comprising members spaced from each other to form a nozzle passa e communicatin Vat its inner end with a t roat formed Wit in one of the nozzle members and having constanty area within said nozzle member, the jet from the nozzle entrainiug or carrying with it the fluid to be compressed into a diffuser surrounding or alined with the nozzle and delivering into a discharge passage or casing, the nozzle and diffuser passages being circumferentially continuous.

Our invention resides also in nozzle structure of the character referred to, in which the nozzle member other than that having the throat therein has a projection opposite the throat to form a suitably curved nozzle passage beginning at the throat and curving into the principal part of the nozzle passage. Y

Our invention resides also in nozzle structure of the character described in which the nozzle' forming members are adjustable toward and away from each other to change the dimension of the nozzle passage beyond the throat, preferably without varying the areaof the throat, though the area of the throat may also be varied when the aforementioned projection is of length sufficient to be adjusted into the throat, thereby de. creasing the throat area.

Ourinvention resides also in` apparatus of the character described in which the diffuser has a throat intermediate its inlet and outlet and referably of a width less than the width ogthe outlet of the coperating nozzle.

Where the elastic fluid is to be compressed to very much higher pressure, multi-sta ejector apparatus may be employed Wherem in the well known manner an ejector in one stage partiall raises the pressureof a fluid to be operatel upon and delivers into a separate and serially connected ejector which further raises the pressure of the .fluid to be o erated upon, each ejector comprising nozz e structure for expanding motive fluid and diffuser structure receiving the motive lluid and fluid entrained thereby and increasing their pressure.

Our 1nvention resides in such multi-stage ejector apparatus comprising separate ejectors connected in series and in whichin an earlier stage there is employed any suitable type of ejector apparatus, While -1n a later stage there is employed separate ejector apparatus which comprises an expansion nozzle delivering a jet of motive fluid in the form of a circular sheet or disk, hollow cone, or other suitable shape, into a surrounding or alined diffuser, whereby in such second stage a relatively short jetof large entraining surface is available for raising the fluid to be operated upon to higher pressure, the nozzle of such later stage ejector being adjustable as to the Widthof its assage, such nozzle adjustment being particularly suitable where there is employed in the se arate ejector of an earlier stage nozzle and diffuser structure all of `whose passages are of invariable cross section; andA our invention resides also in multi-stage apparatus of the character referred to in which in a later stage the annular dilfuser passage may be adjusted as to width.

Our invention resides also in multi-stage apparatus of the character above referred to inwhich the liuid delivered by an earlier stage is divided into streams flowing to op, posite sides of the motive fluid jet o stage.

Our invention resides also in multi-stage apparatus in which in an earlier sta e the area of the outlet or outlets of t e nozzle or nozzles is less than or equal t0 the a later area ofthe associated diiluser.V A assage at its throahfwhile in a later sta e t e areaof the nozzle outlet is greater t an 0r equal to the area of the associated diffuser passage at its throat. Y l

Our invention resides in the foregoing features and other features hereinafter described.

For an illustration of several examples of apparatus embodying our invention reference is to be had to the accompanying drawings, in which: ,I

Figure 1 is a cross sectional view of radial jet apparatus embodying features of our invention. I

Fig. 2 is a side elevational View of one of the nozzle members of Fig. 1. Y

Fig. 3 is a side view o the cooperating nozzle member of Fig. 1.

Fig. 4 is a cross sectional View, on larger scale, through a diffuser and associated nozzle, the latter of a structure differing somewhat from the nozzle of Fig. 1.

Fig. 5 is a cross sectional view of a diffuser and associated nozzle of di'erent type.

Fig. 6 is a cross sectional view through a modified construction.

Fig. 7 is a fragmentary sectional view of a structure similar to that of Fig. 6, differing. however, as to the type of nozzle.

Fig. 8 is a vertical sectional view through a double stage apparatus.

Fig. 9 is a side elevational view of the apparatus shown in Fig. 8.

Fig. 10 is a vertical sectional view of a modified form of double stage apparatus.

Fig. 11 is an elevational view of a further arrangement of double stage apparatus.

Referring to Fig. 1, live or exhaust steam, or other motive fluid of suitable character and suitable pressure, as compressed air or gas, is delivered from a source thereof, not shown, through passage A to the annular expansion nozzle B comprising the disks or other members C, C1, shown in side view in Figs. 2 and 3. Within the member C1 is formed the throat T, of constant area. And opposite the throat T on the member C is the projection t, suitably curved to form a curved passage from the throat T Hto the radial nozzle passage B. Y

Surrounding the nozzle is ythe annular diffuser comprising the members H, H1 betweenwhich is formed a passage which' con verges to the throat q and then diverges to the periphery where it communicates with the discharge casing or passage F.

At A1 is the inlet for the fluid which is to be raised to higher pressure, as for example, Huid from an earlier stageejector or air or uncondensable vases or vapors from a steam condenser within which there is maintained a high vacuum. From A1 the entering stream of fluid is divided into two streams delivered through the passages p, p, to the chambers D, D, on opposite sides ofthe jet issuing from the nozzle B.

The apparatus may be constructedinrthe f joint r as by bolts e, e to form the chambers D, D and thedischarge passage F which has the outlet F2. Secured centrally upon the casing E is the member a su porting the nozzle member C having the s ank b :movable in a recess in the member a and having the extension c threaded at s in the member a and extending to the exterior thereof and terminating in a squared or other suitably shaped end d for receiving a Vwrench or the like for rotating the screw threaded member c to cause lateral adiustment of the nozzle member C toward or away from its companion member C1. A nut serves to lock' the member C in its adj uste position, and a ca g carried by the member a incloses the en of the member c and the nut f.

Supported centrally on the casing member E1 is the member a1 within which is formed the passage A and which carries the nozzle member C1. The diil'user wall H1 is carried by the casing member E1 and is integral therewith, or may be separate therefrom and suitablyifattahed thereto. The other diffuser wall member E and is adjustable laterally toward is supported upon the casing or away from its companion member H1 by the adjusting bolts b1.

The passages p13, p are formed within the casing members E1 and terminate at the upper flange c1 to which is secured at joint fr a flange of the member d1, within which are formed passages registering with' `the passages p,v p and combining into a single passage at A1. f e( The steam delivered to the nozzle B issues therefrom in a jet radiating outwardly in all directions, and entraining the uid to be compressed, which enters at A1 and passes throughthe passages p, p to the `chambers D, D from which it issues through the annular passages p1, p1 into contact with opposite sides of the jet, the mixture being .delivered into the diffuser passage, where it loses its velocityiand increasesin pressure and is delivered into the discharge casing and issues therefrom through the outlet F.

The fluid operatedupon may be raisedin pressure from a pressure below, equal to or higher than atmospheric pressure to suitable higher pressure. And in the case where uncondensable gases or vapors are -tobe removed from a steam condenser they are raised from a very low pressure,as for example 29 inches or more of vacuum, as measured by the mercury column, to higher pressure. qAnd in the casewhere the ap aratus shown in Fig. 1 is in a later stage of.) multista-ge apparatus, it receives the fluid partia ly composed from anY earlier stage iso through the passage Al and raises it to any suitabe higher pressure below, equal to or above atmospheric pressure.

With a nozzle in Fig. 1, the throat T is formed within one of the nozzle members and is of constant area, thereby delivering substantially constant amount of motive fluid, at a given motive fluid pressure. zle member'C, however, will increase or decrease the width of the' nozzle passage B and so vary the expansion within the nozzle passage while the motive fluid consumpition remains substantially the same. This adjustment of the nozzle also effects a change in the entraining surface of the free jet between the periphery of. the nozzle and the point of impact upon the diffuser walls. When the member C is moved toward the member C1 the jet Vbecomes thinner, and therefore longer before impact upon the converging walls of the diffuser, and so increases the lateral entraining surface of the jet into contact with which comes the fluid to be' compressed. Y

However, when the projection t is long enough to enter the throat T, as shown, adjustment of the member C will cause such projection t to Iproject into the throat T to varying distances, and due to the fact that the projection t increases in diameter toward itsbase, the throat area is varied, and

therefore the steam consumption is varied,

along withadjustment of width of the nozzle passage B.

For different adjustments of the member C different adjustments of the diffuser Wall H may be made if desired, or with a given nozzle setting the wall H .sage at its throat )free jet of motive fluid issuing from the nozzle may be made more and more maw be adjusted. It will be understood, however, that the diffuser wall H may be non-adjustable or iixed with respect to its companion H1.

`It is preferred that the width 'w of the nozzle passage at its peri he shall be greater than the width of t e diffuser pasq. By such structure the relatively short; 'since its Widvtbj greater than the width of the dif- Vfuser throat, it impinges upon the converging walls of the dlfuser passage at a polnt distant from the diffuser throat toward the center of the apparatus as the jet increases in width. This is of advantage in that a short jet maintains its form and does not break up to any considerable extent before impact upon the diuser walls. lNotwithstanding this shortness of jet the diameter of the nozzle, that is` the diameter `of either the members C, C1 is small Yenough to insure lateral entraining surfaces of the jet of magnitude suflicient for entraining the elastic fluid to be compressed and raising it to considerably higher pressure in the diffuser. This structure is parof the character illustrated Adjustment of the noz- Where low compression ratios are involved the width of the nozzle outlet may be less than or equal to the width of the diffuser passage at its throat.

While the opposing faces of the nozzle members C and C1 are shown parallel with each other, it will be understood that they may diverge from each other toward their peripheries or may even converge somewhat toward their peripheries. In any case, when using elastic motive liuid, the nozzle passage increases in cross sectional area toward its periphery in order that the motive fluid may expand within the nozzle.

And while the diffuser passage is shown as increasing in width beyond throat g toward its periphery, it will be understood that the opposing faces of thediluser walls may be parallel from the throat g outwardly or may even converge slightly.

At the bottom of each of the chambers D is provided a cock c2 for draining off water or liquid which may accumulate.

In Fig. 4 there is shown, on enlarged scale, the nozzle and diffuser structure shown in Figs. 8 and 10. In this case the throat T of the nozzle is formed wholly within the nozzle member C1, and is of constant area. The projection t in this instance is not of a length to project far enough into the throat T upon adjustment of the nozzle member C to cause variation of the throat area. Here again the width w of the nozzle passage at its' periphery is greater than the width of the diffuser passage at its throat And while the opposing faces of the nozz e members C, Cl are illustrated as parallel, they may converge or diverge toward their reripheries, as described in connection with In Fig. 5 is shown an arrangement in which the nozzle member C has a cavity or depression m at its center opposite the outlet of the passa v A in the opposin nozzle member C1. his structure causes e throat T to be formed at the region indicated between the two nozzle members C and C1, and not within one of the nozzle members, as in Figs. l, 4, 6, 8 and 10. In this case the throat is not an aperture located within one of the nozzle members, as in Figs. 1 and 3, but is of annular or ring form continuous throughout an entire circumference Whose diameter is that indicated in Fig. 5. In this case the adjustment of the member C toward and away from the member C1 adjusts the area of the throat, because the width of the throat 1s varied, though its diameter remains the same, the throat area in this case being found by multiplying thewidth of the throat by the circumference at the point or region of closest approach to the members C, C1 to each other. While the opposing faces of the nozzle members are in this case shown divergent toward the periphery, it will be understood that they may be parallel or slightly convergent. And in any event, when elastic motive fluid is employed, the area of the nozzle opening at its periphery is greater than at its throat.

The nozzle structure of Figs. 1, 4, 6, 8 and 10, is such that the nozzle passage from throat to nozzle outlet causes the motive fluid to change its direction of flow, as from axial to normal to the axis or to an suitable angle with the axis, the motive Huid' expanding while sochanging its direction of flow.

In Fig. 6 the arrangement is such that the nozzle is cone-shaped, producing a jet in the form of a hollow cone. The co eratin diiuser H is also cone-shaped an aline with the nozzle, which latter has the general haracteristics of the nozzle illustrated in In Fig. 7 a like conical nozzle and diffuser is of Fig. 5.

Because of the greater facilit and cheapness in construction, the nozz es and difusers of Figs. 1, 4, 5, 8 and 10 are preferred over the conical forms of Figs. 6 and 7.

It will further be understood concernin the diii'users of Fi s. 4 to 8 inclusive and` Fig. 10 that the width of the dii'user passage may be adjusted as by means illustrated in Fig. l; or the width of the diuser passages may be altered to any suitable dimension, as by placing in or removing from the joints 'r' of either or both diiluser members a gasket or other separating piece.

And in al1 cases itis preferred that the diuser passag arrangement of is shown, but the nozzle the general character `illustrated in e shall decrease in cross seo` tional area to lts minimum area at the throat g and then increase in area outwardly to the periphery of the diffuser. Beyond the throat q the adJacent sides of the diffuser members need not actually divergeas indicated, but may be parallel or even in which case it is still sectional area of the diffuser passage at the periphery. of the diffuser may be greater than at the throat g;

By the foregoing relations diffuser structure compression of one elastic fluid by another is highly efficient, particularly when the ratio of compression is 2 or greater than 2; that is to say, when the presof nozzle and sure to which the fluid is compressedis twiceV or more than twice its pressure before compression.

Referring to Figs. 8 and 9, double stage apparatus 1s shown wherem 1n the rst stage jet type. From sli htly convergent possigble that the cross;

is employed a common form of ejector Y which may be tanned a tubular Basierend',

in the second sta e an ejector of the dial 1g. 9 have been omittedV f pipe g, valve h, the vertical portion tof; pi'

a, and the housing of strainer i, shownir F1 .8. l ".'fi'g" live or exhaust steam, or `other suitable; Y motive duid, is delivered through a pperg," 'f' controlled by valve h, and through a Y i, valve m and pipe n and strainer i* throu Thi Y 'Y the expansion nozzles N, of an Yle' i number, each having a throat area and nozzle assage of fixed dimensidns;Y The motive iluidp issues in jets from the Vnozzzles N into the space or chamber D? in communication through the opening A1- with 'the space containing the elastic Huid to be eomzrrr Y pressed, as for exampl the interior'of a steam condenser or the ike, in which l1 85 vacuum is to be maintained. The motive 'if Y fluid jetsE entrain elastic fluid to be coni-'Y-V ressed, and the mixture passes into thedif-V ser d, here shown tubular in sha acoja-grj velging from the point dto the t catia, an diverging below the same to the poillihal.V The mixture of the two fluids is i i at da at higher pressure than that of the elast-Y Y tic Huid entering at A1, into the passagesVV Y Y Y p, p connecting the separaterst and second Y. sta e ejectors 1n series and communicatn j wit the chambers D, D on o posite sides'ro Y Y the jet issuing from the annular nozzle'B the second sta Y 1 Steam or ot er motive duid is simultane-Y Y10|) ously delivered through the strainer i;nto' the passage A, which communicatesyvvthrr i annular expansion nozzleV B formed betwf Y 'Y the circular or other suitably shaped plates or disks C, C1 adjustable asY to their sepa Y tion by the screw s.'

The jetl from the nozzle fluid from the chambers into the annulaidiuser mixture is discharged into the c in the discharge outlet Il".V Y

n this second stage the pV f elastic liuid is again raised and .Y ej charge casin F the Bressur'e isY Q in the cham er's D? and;Y the casing F maybe atmospheric hi her, or any other desired y closing the valve m the apparatus operate as a single stage com u. elastic duid being j opening A1, through,diffuser@fr sages 15g-pinto thechambers D,.D;,f' is compressed in one sta e to p Sul'e- Y' Y The lines lr indicate jointsforlines 'i sion betweenthe castings or metal the apparatusz the parte divi'd manner to fac1litate'co`isjtructioi,f assembly and'adjustment" The Second stage Yapparatus comprises, Y.

casing members E and E1 forming the discharge passage F and the chambers D, D. One ri sha ed diffuser member is secured by its ring s aped lateral flange or lug f1.1 to the member E and the other to the member E1. The lower parts of the passages p, p are formed in tubular members integralwith the casing members E and E1. Upon the upper ends of these tubular members are secured the lower ends of similar tubular let; and the area at the diffuser throat is members, which form a union near 'the top flange c1 to which is secured the lower or discharge end d3 of the diffuser d of the first stage. By this construction the Huid delivered from the diffuser d of the first stage passes indirectly and in divided streams to the upper parts of the chambers D, D and then flows throughout these chambers and the lower parts as well to both sidesrof the jet from the nozzle B which issues upwardly, downwardly and laterall in all directions, that is, radially, to the iii'user H.

.In Fig. 10 is shown a double stage apparatus in which in both stages the apparatus is of the character illustrated in the second stage of Fig. 8. The elastic Huid to be compressed enters at A1 and passes to the chambers D, D, from which it is entrained by the jet of motive fluid from the nozzle B, and the mixture passes through the diffuser H into the discharge casing F, from which it is discharged indirectly and in divided streams through the passages p, p into the chambers D1, D1 of the second stage, to opposite sides of the jet from the nozzle B1, by which it is entrained, and the mixture is delivered into the diffuser H2, having its throat at g1, and is discharged into the discharge casing F1 having the outlet F3.

B this construction again the elastic fluid, entering at A1 is compressed in two successive stages, from any suitable pressure below, equal to or above atmospheric pressure, to any suitable higher pressure, and as in the case of Figs. 8 and 9 is suitable for withdrawing air or uncondensable gases or vapors from a steam condenser for maintaining therein a high vacuum, as for Vexample 29 inches more or less, as measured on the mercury column, and for compressing such gases or vapors to any other suitable higher pressure, as for example atmospheric pressure or higher.

In Fig. 11 there is shown in elevation a double stage apparatus in which the units are placed side by side and the discharge .from one unit is delivered through the pipe P to the intake of the motive fluid, as steam, being supplied by the pipe g and delivered through the valve m through the first stage ejector apparatus and through the valve to the second stage ap-` paratus.

In the double stage arrangements the best operation is obtained when in the first stage second stage unit,-

though these areas may be equal; while in a the second stagevthe area of nozzle outlet is greater than the area of the diffuser passage at its throat, though these areas may be equal. As re ards the apparatus producing a radial ]et, the area ofthe nozzle opening is found by multiplying the width "di by the circumference of the nozzle outlfound by multiplying theV width of the throat by the circumference of a circle whose radius is equal to the distance of the throat from the center of the nozzle.

Andl Where the radial jet type of ap aratus is used in both stages, it is desira le that the width of the nozzle opening at w shall be greater than the width of the throat of the diffuser in both stages, unless in any stage the ratio of compression is low, in Y nozzle opemng which case the width of the w in that stage may be equal to or less than the width of th diifuser 'passage at its throat. I

For the clai s the terms annular nozzle Aand annularf diffuser will be understood to .include 'nozzles and diiusers having` passages which are either at right angles to the, longitudinal axis and producing rand receiving respectively a disk shaped jet, as in Figs.

fluid nozzle comprlsing nozzle members` spaced from each other to form `a nozzle assage, the throat of said nozzle passage ormed within one of said members.

2. Ejector apparatus comprising a difsake of brevity in the appended fuser and a coperating annular motive fluid nozzle comprising nozzle members` spaced from each other to. forma nozzle passage, the throat of said nozzle passage formed within one of said members, and a projection on the other of the nozzle Amembers rejecting toward said throat.

3. jector apparatus ycomprising a diffuser fluid nozzle comprising nozzle vmembers spaced from each other, the throat 'of said nozzle formed within one of said members and communicating withtheroutlet of the nozzle through a curved passage.

`4:. Ejector apparatus comprising a diffuser fluid nozzle comprising nozzle members spaced from each other to form a nozzle and a 'coperating annular motive` and a cooperatingv annular motive liso , zle complrismg nozzle members spaced from each ot er to form a nozzle passage, a throat of said nozzle passage formed within one of said members, and a curved wall extendinglfrom said throat to the face of said one of said members.

6. Ejector apparatus comprising 'a diff fuser anda coperating annular motive ilui'd nozzle comprising nozzle members spaced from each other to form a nozzle assage, the throat of said nozzle passage ormed within one of said members at a distance from the face of said one of said 1 members.4

lso

V:aus

7. Ejector apparatus comprising a'dif- 'fuser anda ca peratng annular motive fluid nozzle comprismg nozzle members spaced from each other to form a nozzle passage, a throat formed Within one of said members, a curved wall 'extending 'from said throat tothe face of said one of said members, and

a projection on the other of said nozzle members having a curved Wall forming with Said first named curved wall a curved passage from the throat to the space between said nozzle members. v

8. Ejector apparatus comprising a diffuser and a coperating annular motive Huid nozzle comprising nozzle members spaced from each other to form a nozzle passa e, a throat formed within one of said mem ers, and means for adjusting said nozzle members'with res ct to each other to change the width oft e nozzle passage without substantially varying the area of said throat.

9. Ejector apparatus comprising a diffuser and a cooperating annular motive iiuid nozzle comprising nozzle members spaced from each other to form a nozzle passage,

a throat formed within one of said members, a projection on the other of the nozzle members projecting toward said throat, and means for adjusting said nozzle members with respect to each other.

10. Ejector apparatus comprising an annular nozzle comprising stationary members spaced from each Yother to form a nozzle passage, said nozzle assage having a throat located Within one o? said members and sub- Y stantially atits center.

' V11. In ejector apparatus, an annular nozzle 'comprising nozzle members spaced from leach ot er to form a. nozzle passage, the nozzle throat formed Vwithin one of said members, an annular diuser surrounding said nozzle, tsaiddi'user having a throat Y 1' intermediate its inlet and outlet, and means for adjusting said nozzle members with respect to each other.

12. In ejector apparatus, the combination with an annular nozzle comprising nozzle members spaced from each other to form a nozzle passage, the nozzle throat formed within one of said nozzle members and having constant area, an annular dii'user surrounding said nozzle and having a throat intermediate its inlet and outlet, and means for adjusting said nozzle members with respect to each other.

13. Ejector apparatus comprising an annular nozzle, a coperating diffuser, said nozzle comprising members spaced from each other to form a nozzle passa e, said nozzle passage having a throat Wit in one of said members, means for adjusting the width of said nozzle passage, and means for adjusting the width of the diffuser passage.

14. In ejector apparatus, the combination with an annular nozzle, of an annular diffuser surrounding the same and having a throat intermediate its inlet and outlet, the width of the nozzle outlet being greater than the Width of said diffuser throat.

15. In ejector apparatus, the combination with an annular nozzle, of an annular diffuser surrounding the same, ,said dilluser having a throat intermediate its inlet and outlet, the area of the nozzle outlet being greater than the area of the di'user passage at said throat.

16. In ejector apparatus the combination with an annular nozzle, of an annular diffuser surrounding the same, said diffuser having a throat intermediate its inlet and outlet, the area of the nozzle outlet being greater than the area of the diffuser passage at said throat and the width of said nozzle outlet being greater than the width of the throat-of said diffuser.

17. Multi-stage ejector apparatus comprising in one stage an ejector, and in a later stage an ejector comprising an annular nozzle and an annular diffuser, and iuid connections from said one stage to opposite sides of the nozzle opening of the later bers on opposite sides of the nozzle outlet and diffuser inlet, and fluid connections from the ejector of said one stage to said chambers.

fuser.

insane 20, In multi-stage apparatus, the combi- .l

nation with an ejector in one4 stage, of an ejector in a-later stage com risi an `annular nozzle, an annular di user, c ambers on opposite sides ofV the nozzle outlet and and tubular connections with the vejector o said one stage delivering fluid therefrom in divided streams to said chambers at points thereof eccentric with respect to said annular nozzle.

21.,In multi-stage apparatus an ejector in one stage comprising nozzle and diffuser structure all of whose passages are of invariable cross section, an ejector in a later stage connected in series with said first Yejectory and com rising an annular nozzle, an annular di user, said diffuser having a throat intermediate iits inlet and outlet, and means for adjusting the ,width of the passage of said annular nozzle with respect to the width of the tliroat of said dif- -22. In multi-stage bination with an ejector in one stage, ejector in a later stage comprising an annular nozzle and an annular diffuser, said nozzle formed of members spaced from each other to 4form the nozzle passage, the nozzle throat formed within one of said members, and means for adjusting said members for verging' the width of vvit out substantial eii'ect upon the area of said nozzle throat. Y

23. In multi-stage" ejector apparatus, a tubular ejector in one stage comprising a plurality of motive fluid expanding nozzles and a coperating dii'user common to them, said diEuser having a throat beyond which apparatus, the com- Vthe diffuser passage diverges, a separate ejector in a later stage comprisin an annular motive iuid expanding nozz e and a coperating annular dii'user, means for adjusting the width of the passage of said annular nozzle with respect to the width of the throat of said annular .diii'usen and means for connecting saidejectors'in series communicating with the discharge end of said divergent diiuser passage of said tubular ejector and extending to opposite sides of the jet issuing lfrom said! annular nozzle in the later stage.

24. Multi-stage ejector ap 'aratus comprising a lurality of seria ly connected ej ectors eac comprising nozzle structure cooperating with di'user structure, said diffuser structure havin a Ithroat, the area of the outlet of the nozz e' structure being less than the area of the diffuser passage at its throat in one sta e, and the area of the outlet of the nozz e than the area of the diffuser passage at its throat in a later stage.

25. Multi-stage ejector apparatus comprising in each of a plurality of stages an .zle and a coperatin of an4 he nozzle passage structure being greater i nozzle outlet eing greater than the width of the diffuser throat, the area of the nozzle outlet being less than the area of the diffuser passage at its throat in one stage, and the area of the nozzle outlet being greater than the area of the diffuser passage at its throat in a laterstage. z

2 6. Multi-stage ejector apparatus 4comprising independently operatin serially connected ejectors, an ejector of a ater stage comprising an annular nozzle and coperating diffuser, and fluid connections connectin an ejector of an earlier stage to opposite si es of the outlet of said annular nozzle.

27. Multi-stage ejector apparatus comprising in one stage an ejector, stage an ejector comprising an annular nozdiifuser, tubularmembers holding one of t e ejectors in fixed relation with respect to another and serving to deliver fluid'from an earlier stage e'ector in divided streams to opposite sides o said annular nozzle.

28. Multi-stage ejector apparatus comprising in one stage an ejector, and in another stage an ejector comprising an an.- nular nozzle, a coperatin diffuser and a discharge casing surrounding said diluser, and tubular members communicatin with opposite ysides of said annular nozz e embracing cating with said first named ejector.

29. Two stage ejector apparatus for continuously removing elastic 4 iiuid from a chamber Awithin which is maintained an absolute pressure less than three inches of mercury and for compressing the same to substantially atmospheric pressure comprisin a tubular ejector in the iirst stage, a secon ejector in the second stage comprising an annular motive fluid expanding nozzle and a cooperating diffuser, and means for connectin said ejectors in series commumeating AWit the discharge ei'ldfof said tubular ejector and extending to said second stage e'ector and delivering on opposite sides o the motive iuid jet from said annular nozzle.

-30. Multi-stage ejector apparatus coinrising a tubular ejector having nozzle and -tfuser structure, said dii'user structure having a throat beyond which the dili'user passage diverges, a second ejector comprisan annular motive Huid expanding noz- `zle and a coperatin diffuser, and means for connecting said ejectors in series communicating with Vthe dischai'ige end of 'the diver t passage of said di user structure of said rst ejector and extending to said second ejectorv and delivering to opposite sides of the motive fluid jet rom said aniular nozzle,

said .discharge casing and communi- 8 l means 31. Ejector structure comdprisin annular 4berswith respect to said one 'of sadf'zneni- ,10 nozzle structure for expan lng e astio mobers for ad'ustting` the area of said throat t've Huid comprising stationary plate or and thewi th of sadnozzle passage. l disk members spaced from each other to In `testimony lwhereof We have hereunto 5 form a nozzle passage, said nozzle passage axed our signatures this .3rd dayV of July,

having a restricbedthroab Within one of said 1917. members,` a projection on another of said y members extendmg toward said throat?, and GOTTDANK L. KOTHNY. means for adjusting said other of said mem- ROBERT' SUCZEK. Y

Ir. is hereby certified 'than in ushers Parent No. 1,282,595, granted october 22, 1918, upon the application of Gottdank L. Kothny and Robert Suczek, of Philadelphia, Pennsylvania, for an improvement in ,Fluid-Compressing Apparatus," errors appear in the printed speciceltion requiring correction as follows: Page 2, line 94, for the word "attahed read attachedfsame page, line 130, for the word "oomposed read compressed; page 5, lino 61, for the word"through' read to; and that the said Letters Patent should be read with these corrections therein thatI the samemay conform to tie record of thalasso in he Patent Ooe.

Signed and sealed this 19th day of November, A. D., 1918.

l R. R WHITEHEAI),

[BELL] Y l Acting Commissioner of Patents.

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