US2382391A

US2382391A - Eductor

Info

Publication number: US2382391A
Application number: US519555A
Authority: US
Inventors: Berman Philip
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-01-24
Filing date: 1944-01-24
Publication date: 1945-08-14
Anticipated expiration: 1962-08-14

Description

Aug, 14, 1945.

' P; BERMAN4 EDUGTOR 'Fi1edJan- -24, 1944 ATTORNEY Patented Aug. 14, 1945 EDUoToR p Pinna Berman, New York, N. Y. .Appiicatiinanuary 24, 1944, semina. 519,555`

` 2 claims. (o1. roei-26o) n'lh-is invention relates to stream-lined `eductors forpumping water containing sand, .mudcor sludge and which will eiiiciently utilize the energy of theincomingstream fof Vwater under Apressure to f evacuate `or educt the sludge.

fobject of this invention is rto, provide `an eductor ihaiving a conical nozzle Vfor drive water positioned in equally circumscribed relation'in `a hollow 4body for driven water with .the'lower portion of the 4nozzle `projecting below the lower wall of the ,hollow *body :and with the inner oontour `of thenozzle forming `a direct continuation `ofthescontour `of the drive water inlet to said hollow bod-y, whereby turbulence is `avoided and the full pressureof fthe drive water is maintained up to the point of entrance to the nozzle and without loss` of energy to rand through the nozzle.

Another object'of this .invention Vis to provide .a :pressure water inlet rand nozzle `carrier vwhich may vbe selectively adjusted 'to various angular :positionsrelative to the pumplcasingand to providea separable .pipe coupling secured intermediate` the pressure water 'inlet and Apressure water to permit removal of thepre'ssure water *in-let and :nozzle carrier `'witliout .disturbing the set positions -of theeductor :and piping, and so 'that a single .eductor having this rangularly adjustable inlet .and nozzle carrier will :bea'daptedjto take the uplacefof quite ya number `of eductor units having c'ixed angular positions of `the pressure water inlet, and simultaneously to provide full and funobstructed flow `of the pressure water vwithout turbulence, in all of the selective positions. y

With the :above and `other fobjec'ts invi'ew, 'the invention will-be hereinafter AAlrnore particularly described, and the :combination 'and arrangement of parts 'will `beshownin the accompanying draw- `supply line Iwhich may be disconnected at will ing and pointed out the claims which lform i part Aof this specification.

:Reference will now be :had tothe drawing, wherein like :numerals `of .reference 'designate f corresponding parts throughout the several views, i'n'which:

Figure 1 -is -a Avertical cross-'sectional View of thewater eductor embodying theinvention.

4Figure `2 is a cross-sectional view, Vtakenv `as `on line 2--2 in -Figure 1. l i

. the lillustrated-embodimentoi the invention the numeral I0 indicates a stream-lined `eductor comprising a tubular central portion `or body H. A nozzle hl2 is positionedaxiallyfof the said tubularbodylfl. I t l `Venturi or compound Ltub'e rI3 is 'threadably secured at the ,outletl end` of ythe .tubular body `'Igl and in axial alinement therewith. The Venturi tube i3` has aconverging `lower portion I4, a vdiverging upper portion l5, a throat I6 fandga cylindrical tubular portion l1.

The 'outlet of the nozzle l 2 terminates in spaced relation from the throat t6 of the Venturi tube. `i3, 1eaving an annularzgap. The nozzle I`2:isof

conical form 4so as to increase the velocity @ofthe drive water passing therethrough. l i

` `Asrshown in Figure 1, it will be seen that .the outlet edge of the .nozzle I2 .is substantiallyof knife-edged thickness which serves `to Amaintain the annular space at themeteringentranceand y permits merging of the drive and drivenfstrea'ms of water without turbulence.

The tubular portion L7. `forms a metering or i mixing chamber in which the driven water meets the `drive water `from the nozzle. Thefchamber l1 has fan upper metering plane I8 and 'lailower metering ,plane i9. `As shown in Figure 1, it jwill l be seen that the mixingchamber is `of uniform` cross-section throughout its length.

The metering junction of these streams rtakes place adjacent the lowermeteringplane It).` `For `maximum efficiency the meeting junction of .the

drive and driven'streams should bepositioned at a minimum distance above the lowermetering planeof .the metering part ofthe neck, Aor mixing chamber. v i

The :body H of the water eductor `t0 has an integral inlet 20 `which is `axially oise't yfrom fthe axis of the nozzle l2. Below the body Il is a. curved elbow-shaped inlet 2l for the `drive water. As shown inthe drawing, the body Il provides a very large storage chamber 22. The lower Yelbowshaped portion preceding the nozzle is so curved for easy flow as to `overcome nearlyfall the loss of elbow friction. The inner contour of theinoz'- zle forms a direct'continuation of the contour of the elbow-shaped `pressure water inlet, 1so-as to produce a minimum of resistance to flow. `As shown in Figure 1, it will be seen that the .upper elevation of the nozzle is :positioned considerably above the largestcross-sectionof the hollow body.

I rprovide the elbow-shaped Yinlet 2| with a circular flange 25'and a similar circularflange 26 `is provided on the lower face of the body I'I.

Studs 2l' passing through clearance holesinthe flange 25 and threaded in theflange -26 `provide means -Whereby the elbow-shaped inlet 21 may i be detachably secured to the body l l.

of the hollow body The inner surface of the flange 25 has a thread 30 into which the nozzle may be threadably secured.

The bolts 21 are equally spaced around the

circular flanges

25 and 26 to permit adjustment of the pressure water inlet 2| in selective angular positions in relation to the body while maintaining axial alinement of the nozzle I2 with the axis of the mixing chamber under all angularadjustments. i

As sliownein Figure l,I a separable pipe coupling 32, wellknown in the art as a union, is secured -thatvarious changesandmodications can be made therein without ,departing from the spirit to the inlet 2| for the drive water and to thegy. 1;

pressure water supply line 3|. pipe coupling 32 when unthreaded permits* the nuts 33 on,the studs 21 to be removed-and the ;,tionsza gasket 34 is inserted betweenthe flange y)25;,and theapertured lower face 26 of the casing and assures a tight junction between theinlet 2| and the casing 1 In operationI the drive water'passes throughy the -nozzle l2 and causes the liquid discharged therethrough to be under increased high velocity.

l.The nozzle l2 projects directly into .the entrained stream so that .the general direction of the len- '.trained stream is not changed. The entrained :liquid is given an impulse by the eductor jet in .the direction in which it is ilowing.

, Theconicalnozzle of the eductor imparts an `impulse effect to the 1liquid and functions to increase the velocity of the liquid and tocreate` xa high suction at the throat of, the Venturi-tube rI3. l

Eductors have heretofore been designed wherein thecontour of the pressure water inlet did not Vform a direct continuation of the contour of the conical nozzle.` This arrangement of the operating mechanism interfered with the ow andipro- `duced turbulence and otherwise interfered with xthe eicient operation of the instrument.

.The improved eductor herein disclosed avoids 'the-objectionable construction of the features of the prior art and comprisesow passages which y-are stream-lined in the direction of flow, and so that sharp angles and indentations which would `cause turbulence are avoided and ywhich permits flow therethrough with the least possible resisti Underoperating conditions, after an` installation is made it is desirable to be able tochange the sizeof the nozzle without dismantling the entire piping arrangement. This substitution of nozzles may be due to varying pressure inlet conditions that may be different from those contemplated .before the installation was made. 'Inlet .positions are always speciiied, as side in- .let perpendicularto the directionof flow of the suction and ldischargejinlet parallel toi suction and discharge, but in a vertical. position forming a returnI` L, or parallel to suction and discharge and linz the'same direction as `suction and discharge,;as.we1l as the inlet .being in any angular relationwith the axis of ilow and suction.

Itfisreadily seen yfrom the drawing thatithis unit will answer anyl of; the above specified conditionsanolI thisflexibility in design often makes possible the completion ofawship, naval vessel, etc.,Without'waitingl yfor `the partiCuIar-speCied eductor unit or uni Y 'The design of eductor herein disclosed, where the nozzle `forms adirect continuation of the con.

The separabley ...gated hollow body for driven water, said hollow of the invention as deilned by the appended jclaims.

I claim: 1. In a stream-lined water eductor, an elonbody having an opening in its lower face and a cylindricalmetering or mixing chamber of circular cross-section for drive and driven water at its upper` portion, said mixing chamber being of uniform cross-section and being dened by upper andlower metering planes, a curved elbowyshaped pressure water inlet-having an opening in its upper face, a conical nozzle-fordrive water under pressure mounted in said opening, the outlet edge of said nozzle being of substantially knife-edge thickness to permit merging of said driveand driven streams of water without turbuleneesaid nozzle passing freely' through said lower face opening in said hollow body, the upper elevation of said nozzle being positioned consid- Verablyabove the largest cross-section of said lhollow body, releasable means for securing said innerA contour of saidnozzle being positioned so `asto forma direct continuation of the contour o f said .curved elbow-shaped inlet, and substantially without loss of energy dueto shock in passing through said mixing chamber whereby turbulence l1s avoided and the full pressure of the drive water is maintained up to the point of entrance to lsaid nozzleand without loss of Venergy through said nozzle. i

2.V In l,a stream-lined water eductor, an elongated hollow bodyfior driven water,.said hollow body having an opening in its lower face and a cylindricalrmetering or mixing chamber of circular cross-section for drive and driven water at its upper portion, said mixing chamber being of` uniform cross-section and being dened by upper and lower metering planes, a curved elbowsnapedipressure water inlet having anv opening 1n its upper face, a conical nozzle for drive water underpressure mounted in saidopening, the out- .let 'edgepofpsaid nozzle being of 'substantially y is avoided and the `full pressure of the drive water is maintained up to the point of entrance ing below the lower wail of said hollow body, the 10 `mixing chamber.

inner contour of said nozzle being positioned so as to form a direct continuation of the contour of said elbow-shaped inlet. whereby turbulence to said nozzle and substantially Without loss of energy due to shock in passing through said PHILIP BERMAN, i l