US2273558A - Pump - Google Patents

Description

Feb. 17, 1942. K. BuRGEss PUMP Filed Oct. 18, 1940 3 Sheets-Sheet 3 Patented Feb., 17,194.2

UNITED STATES PATENTv OFFICE.

, PUMP Walter K. Burgess, Riverside, Calif. .application octoberis', 1940, serial No. 361,745 l Y1': claims. (c1. 10a-"ssi (Granted under the act of March 3,1883, as

amended April 30, 1928;` 370 0. G. 757') The invention described herein may be'manufactured andused by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates lto improvements'. in pumps and an 'object of the improvements is to provide a four stage rotary screw and centrifugal tiple impellertype; the rotor being designed to .occupy substantially the normal space of a single impeller. f

Another object of the invention is to provide a multi-stage rotary screw and centrifugal pump of limited overall dimension and large capacity with opposed intakes.

Another object is to provide, in such a pump,

means of varying both the volume and the -pressure Within wide limits.

A further object is to provide a pump of simple, sturdy, design and requiring little or no attention through long periods of operation.

Briefly, the invention embodies two'oppositely disposed screws feeding into a rotary central common chamber from which the fluid or liquid` fuel is discharged by centrifugal force through apertures into an outer chamber from which it passes through the outlet port; the flow of the fuel being assisted by propeller blades on the rotary central chamber.

In the drawings i Figure l is i, a vertical longitudinal sectional view of a pump constructed in accordance with the invention and having a tangential outlet;

Figure Zis 'a ,sideview, partly in elevation and partly in section, of the pump shown in Figure 1;- Figure 3 is a detail vie W,rin perspective and on an enlarged scale,.of a fragment ofthe pump rotor showing the radialbuckets;

Figure 4 isa section online |'4` of Figure 3;'- Figure 5 is a detail view'of a section of the the propeller-like Figure 9 is a detail view illustrating the provision of a pulley on the pump as a means for v driving the latter:

Figure 10. is a longitudinal section view of the pump as modified to have a lateral instead of a tangential outlet;

Figure 11 is a-detail sectional view of an intake and feed pipe connection;

Figure 12 is a section on line I2-I2 of Figure 1;

Figure 13 is a section on line I3-l3 of Figure v 12; and

Figure 14 is a detail view, in perspective, of the terminal construction of the Archimedean screw.

The stator casing of the pump shown in 4Iliigures l and 2 consists of a central 'or peripheral channel section I0 and opposite side bellied sections I I and I2 defining a rotor chamber which is of elliptical section in the direction of the rotor axisbut of substantially circular cross section in a direction perpendicular to the axis. Section I0 is so dimensioned that the channel formed theretion of'a fuel tank with the pumpstalled in th sump thereon; i

Figures 'I and 8 are detail viewsillustrating the use of dierent sizes of rings for varying the pump pressure and volume;

by increases in 'capacity from point D to Da, in

la counter-clockwise direction as viewed in Figure 2. This provides a circumferential chamber Ilia vof large capacity to receive the discharge from the rotor.' This chamber has its' outlet cular portion of the peripheral section I0. Hence chamber 10a and conduit I3 form a tangential outlet whichtapers two ways to the peripheral be separately formed flanged units detachablyA fastened together at their flanged extremities by cap screws or other suitable means, as shown at lIl with weld spots for the heads oi' the cap screws. As an alternate method, the peripheral section may be cast'lntegral with either side sec- .through a pipe or conduit Il tangent to the cirtion, the other side section being detachable..

Each side section has a journal box I! with suitable packing IB and inner and outer ball races il to `supportthe journals of the rotor; the boxbeing externally screw threaded to receive the packing nut Il. The inner bearing race is lubri cated by the liquid of the pump; the outerrby lubricant through cup or other conventional means. 1

Each side section is provided with a pedestal Il for mounting the pump in a sump or another sweated or otherwise secured to turn as a unit therewith. The shell is formed with a central chamber 20 which is elliptical in the direction of the axis but circular in a direction perpendicular to the axis. 'Tubular extensions 2l and 22 at opposite sides'of the central chamber and corr` centric with the axis of the chamber provide inlets for the chamber and are flared at their outer open ends 23 to admit the fuel or liquid to be pumped. For reasons hereinafter explained, the

diameter A--A of chamber 20 is preferably twice the diameter B-B of either inlet tube 2l or 22.

Hence, chamber 20 has a capacity which is four vide a circular-elliptical chamber surrounding the rotor chamber and in communication with the interior of the rotor chamber through a plurality of orifices 26 in the inclosing Wall of the latter. The number and size of the orifices 26 preferably are so proportioned that the sum total orice area presented thereby is greater than the capacity of the pipes or tubes 2| and 22. Chamber 25 is divided into two concentric compartments of Venturi-like cross section -by concentric impeller on the rotor. In the disclosed embodimentlof the invention, this is shown as comprising a centrally located outstanding concentric ange or ridge 21 on. the periphery of the rotor chamber 20. The ridge is fluted, grooved, or otherwise provided, on opposite sides to provide three-sided radial buckets 28,` open on their outsides, as shown to advantage in Fig- -ures 2 and 3. These buckets extend into the peripheral section l0 of the stator casing and serve 'to pick up the liquid from the compartments of the stator chamber 25. Each bucket is in direct communication with the interior of 4the rotor chamber 20 through a bottom opening 23. For reasons of stress and vibration, the radial buckets are staggeredly arranged along their central division.

The tlow of liquid from the compartments of the -stator chamber 25 into the buckets 28 is accelerated by small propeller-like blades on andperpendicular to the outer surface of the rotor chamber 20. Two groups of such blades are provided in each compartment, each group preferably consisting of four equi-spaced blades; the blades of one group being staggered with respect to the blades of the other group. The outermost group of blades 30 is set low on the outer circular periphery of the elliptical rotor shell and, the innermost group of blades 39a is set high, as seen in Figures 1 and 5. On each side of che ridge 21 is adurai ring 3| of the crosssectional design shown and concentric with the 'rotor axis. These rings bridge the open sides of the buckets 28 and. nt closely against the inner top surfaces of the side sections Il and l2 of the stator casing adjacent their connections with the peripheral section l0. Each ring has an integrally formed annular attaching flange 32 extending into the peripheral s ection to be `engaged by the fastening members Il. These rings are designed to reduce the crosssectional areas of the passages through which liquid flows into the buckets 28 from the compartments of the stator chamber 25, and provide, in effect, an annular series of Venturi-like apertures or passages 33 on opposite sides of and adjacent the base or root of the concentric impeller 2l. Dierently sized and interchangeable sets or pairs of such rings are provided for selective use whereby the pressure and volume of the pump may be carried Within the Figures 7 and 8 illustrate, on a reduced scale, the use of differently sized rings, the rings 3Ia. of Figure 7 'proportionately being of smaller size than the rings 3| of Figure 1 while the rings 3Ib of Figure 8 are proportionately larger.

The impeller core of the rotor comprises a number of centrifugal impellerblades or vanes arranged within and dividing the rotor chamber 2i) radially along 'its axis into compartments, and a feed screw or helical conveyor within and coextensive in length with each tubular extension or inlet. The screws are oppositely pitched to feed into the compartments of the chamber 20 during the pumping action of the rotor. In the construction illustrated, the impeller core consists of two Archimedean double spirals or co-axial screws 34 and 34a rightand left hand pitch, respectively, each screw providing four separate paths or channels for the 'liquid flow. These screws are spaced apart at their inner opposing -terminals'by a four-bladed centrifugal impeller 35. The centrifugal impeller may be formed as an integral part of the double spirals 34 and 34a by enlarging and straightening the double spiral vanes V and Va of the impeller core so asV to cause them to bisect each other at right angles along the axis of the screws. Hence, the central rotor chamber 20 is divided into four 'equal quadrants, and each tubular extension 2l and 22 is divided into four spiral liquid conduits as shown in Figure 2. Each quadrant receives the discharge from one of the conduits of the left hand screw and also from the corresponding spiral conduit of the right hand screw. Obviously, the impeller core may be constructed to provide any other desired number of central chamber compartments and spiral conduits.

These compartments prevent any slippage of uid on the inner periphery of the chamber during rotation of the rotor whereby the motion of the uid discharged thereinto from the Archimedean spirals is eifectively changed from a helical path to one of rotation 'in a plane at right angles to that of the axis of rotation. At the outwardly flared ends`23 of the tubular extensions the vanes V and 4Va of the impeller screws extend in planes bisecting each other at right angles along the axis of the screw, as shown in Figure 14. rfhese straight or flattened sections of the vanes are provided at their outer edges Withblades or deiiectors e, f. 9 and h, angularly inclined and pitched in the manner illustrated to impel the liquid into the flared ends of the tubes during the rotation of the latter. By the action of centrifugal force, the uid is forced outwardly from each compartment through the .multiple orices in the surface of chamber 20.

For reasons of manufacture, the impeller core is in two parts, threadably joined at 36.

Various methods and means, suitable to a particular location and mounting of the pump, may be used to transmit power vto the pump for turning the rotor. In Figures l and 2, the pump is shown mounted in the sump 3T of a fuel tank 38. Each inlet 2l and 22 of the rotor is disposed wholly within the sump and has-a driving spider shown in Figures 1 and 12, .preferably consists of four -equidistant members or arms 3! radiating in a common plane from a hub and'hav- Y ing right angle extensions Il. These extensions to the inlet. Each arm of the spider is beveled in cross section 'to function las an impeller .for

y 2,273,558 3 operatively therewith. This spider, as v pointed out and described, the pump shown in Figure is structurally similar' to the pump. shown in Figure 1 and both types of pump func-` tion in like manner. l

In the operation of the pump, the uid is impelled into the flared inlet ends of the tubular casting the liquid inward, that is, toward the inlet', and in addition is provided on its leading edge with a feathered scooping lip or vane I2.

kA. hollow shaft 43 is rotatably supportedY in a packed bearing M in a side wall of the sump with its inner end secured to the hub of the spider and its outer end connected by gearing 4i with the drive shafty of a motor It. Suitable clutches l1 are included in the" power transmission for securingor breaking rotative continuity between the rotor and the driving devices. One driving device is suiiicient to operate the pump but two may be provided so that if one device fails, the othermay be set Vin operation. In the event that a belt or pulley drive is desired. either or v both extensions of the rotormay be provided with a pulley II as illustrated in Figure 9. x A means-of connecting the outer ends of the rotating intakesZl and 22 of the rotor to stationary supply or feed pipes is shown in Figure 11, wherein adjacent ends of an intake and a A stumng gland Il is threadedly engaged with the pipe end IS and provides a bearing for the rotating intake 22 over and around which it extends as illustrated. 'I'he gland is provided with the packing Il and a packing nut 52.

For mounting in a tube or capsule, where the maximum capacity within a minimum overall diameter is desired', a casing exit variation type of pump is provided, as illustrated in Figure 10. In this type, one side section 53 of the stator casing is provided with a angedextension il to which the larger flanged end i5 of the peripheral section 5I is connected by suitable means pump mounting, suchas the pedestal I2, is pro-L vided on the stator casing side section 53; the

other unit is integral with the peripheral secfeed pipe are indicated at 22 and 49', respectively.

' surface.

extensions of the rotor bythe action of the cast- Y Y ing impellers I! and the deflectors e, f, y and h at the respective inlets of the extensions. The

liquid is then acted upon by the screws and #la and forcibly fedinto the separate compartments of the rotor central chamber 20'. VThis is the first stage of the pumping operation. 'Ihe A A over the inlet diameter B--B and fly quickly to the circular periphery of the chamber 20 and exit through its perforated colander-like pacity provided bythe diameter B-B.r Therefore, there is created in the central chamber 20 in proportion to the centrifugal force a partial vacuum which tends to accelerate the feed of the fluid from the inlet and increase the efficiency of the iirst stage. The fluid exiting from the revolving chamber `2li enters the outer stationary chamber 25 and passes through the Venturi passages 33. In this, the third stage, the propeller blades lli-30a on the periphery of the rotor asset in evacuating chamber 25 by forcing the iiuid from'both Asides towards the central outlets 33. In the fourth and last stage, the fluid .passing through the Venturi-like passage 33 is pickedup by. the buckets of the concentric impeller and discharged in large volume at maximum force intothe outlet chamber of the stator tion It.. Between' its connections with the stal tor casing side sections, the peripheral section is spaced outwardly from the concentric impeller I3 and from the rotor casing side section 5l to provide a large capacity outlet chamber il to receive the discharge from theimpeller buckets 6I. Chamber has its outlet through a pipe or conduit it extending laterally o f the chamber in the axial direction of the rotor. The conduit Il is formed as an integra-1 part of the peripheral section It and, together with the chamber Il is located almost wholly within the circumferential dimensions of the concentric impeller 63. In otherwords, as compared with the tangential exit type of pump illustrated in Figures 1 and 2, the lateral exit type of pump shown in Figure 10 is of smaller total overall diameter. Aside frcnrthe specific distinguishing features already casing` peripheral section. Fluid also passes directly from the rotor chamber 20 to each buck'et of the concentric impeller through the 'opening in the root or bottom of the bucket. From the outlet chamber, the fluid passes under pressure v through the pump outlet for conveyance in any suitable manner to the point or points of delivery. Y

^ It is understood that although the pump structures hereindescribed and illustrated embody certain specific designs, the ideas andY principles disclosed are by no means limited to these same,

but'are applicable Vto and may be used with any number of other suitable designs and variations as conditions may indicate.

Having thusdisclosed the invention, what is claimed as new and patentable is:

l. A multi-stage fluid pump having, in combination, a feed screw, a centrifugal impeller having a center intake at the fluid-exit end of the screw, a chamber enclosing the centrifugal impeller for receiving the fluid-discharge of the centrifugal impeller and having an annular. Venturi-like fluid exit passage, an evacuating pro peller in the lchamber for boosting the iluid now todeiiver it to the outlet chamber.

2. A multi-stage fluid pump having, in combination, a feed screw, a centrifugal impeller hav- This is the second stage. The diameter A-A provides for more than twice the catx'iIUgalimpeIlerand evacuatingpropeller's .ing chamber, an evacuating propeller in the fluid receiving chamber for boosting the fluid flow toward the outietof thesaid chamber, and a centrifugal impeller having circumferential buckets operatively associated with the said chambers to receive the discharge from the iiuid receiving chamber outlet and to deliver it to the outlet chamber.

3. In a pump, a power-driven rotary tube hav- .ing an enlargedbulbous middle portion provided with multiple orifices in its periphery, spiral conduits in the ends of the tube and discharging into the bulbous portion, radial varies in said bulbous portion forming compartments having outlet through the said multiple orifices, a centrifugal impeller on theperiphery of the bulbous portion of the tube and including an annular series of buckets extending radially outward inla common plane perpendicular to the axis of the tube and substantially equidistant from the ends of the tube, each of said buckets being open at its side and outer end, a stationary chamber inclosing the said bulbous portion of the tube and being of reduced cross sectional area at the open sides of the buckets to'provide an annular Venturi orifice on each side of theimpeller, propellers 'on said bulbous portion and operating in the stationary chamber to assist in the evacuation A thereof, and an outlet chamber in communication lwith the outer ends of the impeller buckets.

4. A multi-stage fluid pump having, in combination, a rotating tube having an elliptical -bulbous sectionl said section having multipleoriflces in the periphery, a spiral inclosed in an open end of the tube and connected with the latter to rotate therewith for delivering uid into said section, means in said section for changing the fluid motion from a helical path to one of rotation in a plane at right angles to the axis of rotation whereby the uid is expelled centrifugally through the peripheral orifices, a stationary annular chamber concentrically about the bulbous section for 'receiving the iluid expelled from the said section, said chamber having a concentric annular Venturi-like outlet opening, acircular group of fluid impelling members within the stationary chamber and integral with the periphery of the bulbous section to rotate therewith about the axis of the chamber to force the fluid in thechamber toward the outlet opening,

-a centrifugal impelller concentric with and con- 5. A multi-stage pump having, in 'combination, -flrst stage means including an induction screw, second stage means including a centrifu-.

gal impeller at the eduction end of the screw and YYoilarger diameter. than the screw, third stage means including a stationary Venturi chamber of double Venturi-like cross section concentric with and'embracing the second stage cegwit - in the chamber concentric with and operatively connected with the said centrifugal impeller to turn therewith, and fourth stage means including a centrifugal impeller of larger diameter than the second stage centrifugal impeller and having a ring of radial discharge buckets at the eduction throat of the Venturi chamber to receive the output of the said chamber.

6. A multi-stage pump having, in combination, first stage means including a rotary power driven eduction screw, second stage means including a centrifugal impeller operatively connected-with the screw at the eduction end of the latter to turn therewith and being of larger diameter than the screw to boost vthe output thereof, third stage means including a stationary 'Venturi chamber of double Venturi-like cross section concentric with and embracing the centrifugal impeller and evacuating propellers Within the chamber and operatively connected with the centrifugal impeller to turn therewith, and fourth stage means including a centrifugal impeller of larger diameter than the second stage centrifugal impeller and havinga ring of radial discharge buckets at the eduction throat of the Venturi chamber to receive the output of said chamber, said fourth stage centrifugal impeller being operatively connected with the second stage ,centrifugal impeller to rotate therewith. i

'7. A pump having, in combination, a rotary power-driven vane assembly yhaving a colanderlike inclosing wall provided with center inlet opening, a screw operatively associated with the said assembly to rotate therewith for delivering uid thereto through the said inlet'opening, a

stationary chamber around said assembly for I re eiving the fluid discharged through the multiple orifices. in the said colander-like wall, said chamber having a Venturi outlet, and multiple propellers in said stationary chamber and opera- -tively connected with the vane .assembly to rotate therewith for propelling the fluid of the stationary chamber toward and through the said Venturi outlet.

8. A pump having, in combination, a central elliptical rotatable chamber provided with a center inlet and a colander-like discharge surface,

said chamber having radial compartments, a

screw at the said inlet and operatively associated with the said chamber to rotate therewith for delivering fluid to the chamber, a stationary. Venturi chamber around and concentric with said rotatable chamber for receiving the fluid discharged through the multiple orifices in the said colander-like discharge surface of the rotatable chamber, said Venturi chamber being 4of double- Venturi-like cross section with its annular throat portion opening radially outward in a central plane perpendicular to the axes of the chambers,

impeller buckets on the periphery of the rotatable chamber and extending through the throat portion of the Venturi chamber, said buckets beling open at their outer sides and ends, and a outer chamber' being substantially twice the diameter'A of either inlet tube and thenumber and sizes of the multiple Ormces being such that the sum total orifice area thereof is' greater than ,the

oriiice area fthe inlet tubes, a fluid feed screwminted in mi; mue toturnvtnewunand pltchedtodischargeintotheellipticalchamber, radialvanesinsaidchamberiorchanglngthe iiuid motion-from a helical` path to one of rota- A tionina pianeatrlghtanglestotheaxisofrotation whereby th'e fluid is expelled from the chamber through the multiple oritlc'es by a directcentritugaltorceequaltotheradiusoithe chamber at any point plus the speed of rotation and supplemented by the combined force of the screws and a partialv minus pressure within the ,chamber, a ring of impeller bucket on the periphery concentric Venturi-like' orifices on each side of the impeller buckets, and an outlet chamber' inclosing the buckets at the discharge outlets thereof;

10. A pump having, in combination, a centrifu- 4 gal impeller having a central iiuid intake and a radial iluid outlet, a uuid-receiving chamber extending circumierentlally of the said impeller for receiving the iiuid discharge from the latter,

said chamber having a Venturi-like annular fluid exit passage leading radially and centrally outward 'of' thechamber, an annular outlet chamber extending circumferentially of the fluid-receiving chamber and covering the said iluid exit passage of the latterv chamber, a centrifugal imber.

1l. A pump having,V in combination, a rotary centriiugal impeller having a center intake openwithin the chamber 'and reducing the crosssectional area'of. the chamber at each side'of the Venturi-like fluid exit passage of the said chaming and radial discharge openings, a iiuid-receiving chamber having its inlet open to the said impeller for receiving the radial discharge from the-latter, and having a Venturi-like outlet, an outlet chamber contiguous to and in communication with the Venturi-likev outlet of th'e chamber, and a booster impeller within theiluid-receiving chamber and operatively connected with the centrifugal impeller to be rotated therewith for boosting the uid ilow toward the Venturi-like outlet. a

12. .A pump having, in combination, a powerin communication with the said :duid-exit passage ofY the stationary chamber, a centrifugal impeller on the external periphery of the bulbouslike chamber and extending into the :duid-exit passage or thestationary chamber to divide the said chamber into separate axially'algned com-v partments, and means within each compartment and reducing the cross area of the compartment at the inlet to the said centrifugal impeller to provide a Venturi-like. passage and through A throughwbichthe v134A vpump having, u; combination, a rotary centrifugal impeller, a. stationary chamber about the periphery'of and having separate A non-communicating compartments` for receiving the centrifugal discharge from the impeller, said vchamber having acentral circumferentially extending outlet orice common to and opening radially outward of the said compartments, means outlet oriiiceqto provide ineach' compartment a Venturi-like passage connecting the compartment of the chamber with the outlet orice, and

a peripheral outlet chamber in .communication with the said orifice. l

14. A pump having, in' combination, av rotary centrifugal impeller, a stationary chamber about the periphery of the impeller forA receiving the centrifugal discharge 'from the impeller and having a central circumierentially extending outlet `concentric with and facing radially outward of 4the impeller, means integral with' said impeller 'and extending into the said chamber and its outlet to partitionthe chamber into oppositely disposed compartments having separate duid-outlet, passages, said partition means including radially disposed buckets operatively associated with the said fluid-outlet passages to receive the iiud passing therethrough, removable annular Lmembers within the chamber and concentric with the par-v tition means, said members collectively being of a configuration4 producing areduction in the cross sectional area of the chamber and being relatively arranged adjacent opposite sides of the partition means to provide Ventiu'i-like passages through which the fluid of the compartments passes into the buckets of the partition means, and a peripheral outlet chamber in communication with the said buckets to receive the uid discharged therefrom. I 4

lfiLA'v pump comprising a power-driven hollow rotor of elliptical bulbous contour having oppositely inlet openings and multiple driven rotor having a uuid-receiving chamber of Y into the buckets.

outlet apertures in its periphery, induction spirals discharging into said inlet openings, radial compartments in said hollow rotoror receiving the discharge from the said spirals and expelling same through the outlet apertures, a stationary `chamber surrounding the rotor rand having a 'peripheral passage concentric with and opening radially and circumierentially outward of and in the equatorial plane of the rotor, impeller means integral with said rotor and including oppositely disposed radial buckets on the periphery of the rotor and extending through the peripheral outlet. passage of the stationary chamber, said buckets being open to the chamber on their outer sides and tips and to the interior of the rotor through bottom apertures, said chamber being of reduced cross sectional area in the vicinity of the peripheral outlet to provide on each side of the buckets an annular Venturi-like orifice through which discharge is-eiective from the chamber 1an. uuid-pump having", `rotatable tube-having an inlet andan outlet,

i a screw vmounted inr said tube to -be rotated therewith, impeller elements on the end of the screw adjacent the inlet of the tube to impel fluid toward the screw, and impeller elements secured tothe inlet tube in outwardly spaced relation to the impeller elements of the screw for casting iiuid toward the screw impeller elements.

mudar the committment ktoth'esaillililllelhil'-,

in combination, a

. extending in planes bisecting eachother along 17. Avuid pump havingtin combination; a rothe axis of the screws, and blade elements protatabl'e tube having an inlet and an outlet, a prluvided at the outer edges of the said van and rality of co-axial screws mounted in said tube angularLv inclined to impel iiuid into the inlet to be rotated therewith, said screws terminating of the tube.

adjacent the inlet of the tube in straight venes 5 WL'IER, K. BURGESS.

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