US2615397A - Pumping apparatus - Google Patents

Description

oct'. 28,1952 w, J. CQNERY 2,615,397

PUMPING APPARA'IUSl l Filed April 7, 1949 3 Sheets-Sheet 1 ATTOFNE YS Oct. 28, 1952 w J, CONERY n 2,615,397-

PUMPING APPARATUS 3 Sheets-Sheet 2 Filed April 7, 1949 BY fw@ MMM Oct 28, 1952 w. J. coNERY PUMPING ,APPARATUS 3 Sheets-Sheet 5 Filed April 7, 1949 INVENTOR WILL/AM J MNE/BY "MM f M Patented Oct. 28, 1952 UNITED PUMPING APPARATUS William J. Colmery, Ashland, Ohio, assignor to 'The F. AE. Meyers & Bro. Co., Ashland, Ohio,'a.

corporation of Ohio Application April 7, 1949, Serial N0.'85,983

Claims. 1

The present invention relates to pumping apparatus or systems, particularly those of the jet type, and is concerned primarily with pumps that are adapted to be converted from shallow to deep Well or vice-versa with simple *changes in the connections.

Various types of combined jet-centrifugal pumps are being'produced by pump manufacturlers `and intended to be converted from deep to 4acterV in making the'substitution or replacement of parts duringvthe converting operation. Moreover, in those pumps inA which the jet unit is contained in the combined air vseparator priming chamber vdifficulty has been 4experienced in making adequate provision for connecting the air volume control to the suction side of the centrifugal pump, particularly when it becomes necessary to change the operation of the pump over from shallow Well to deep well.

In an attempt to avoid this diiiiculty the art has either removed the jet pump toa position eX- terior of the priming chamber Where it is more accessible, or else the automatic. air volume control connectionhas'been left off entirely. However, When the jet pump is positioned remote from the chamber and is not contained Within the chamber, the latter necessarily must be made relatively small in orderthat the overall dimensions of the pump assembly will not beunduly large and in this case the'degree of ai'r separation is .reduced kin corresponding amount. On the other hand, .when the automatic air volume control is omitted entirely, the necessary. air cushioning effectat the pneumatic pressuretank vcannotbe obtained so that the system does not operate satisfactorily. y

Still another difficulty found in manufacturing and operation of pumps .of this character, particularly when designed for'optional shallow or deep Well use, is that the individual parts cannotbe readily removed vfor inspection or replace- -ment without also removingvthe main portions `particularly when forming-part of a relatively large pump, so y'that the vinspectionof thepump as well as theremoval-'of any parts for gquick conversion vrepresents considerable work.

'Therprimary object-of the presentinvention is to provide a pump Aof the jet-centrifugal type adapted for both shallow and deep wellfuse and in which the conversion from shallow to deep Well and vice-versa is 'accomplished with a minimum of eifort and involves the substitution of the simplest type of parts.

Another object is to provide a pump of the type noted and in which the jet unit is contained within a combined, totally Aenclosed. air separatorpriming chamber and yet the jet pump can be removed as a unitand an accessory substituted therefor for use when thepump is arranged for deep Well operation.

Another object istop'rovide a pump of the character described with a combined air separator-priming chamber and in which the nozzle and diffuser elements vof the jet pump are attached together in proper spacing Within the chamber and can be removed as a unit forconversion to deep well use Without having to remove the chamber.

Another object is to provide an improved pump of the type noted having a relatively large combined air separator-priming chamber containing a detachable jet pump unit and in which the only change necessary for converting the pump to deep well operation is the substitution of a tubular member for the jet pump unit, the change being made Without 'disturbing the chamber other than removing the jet pump unit.

Still another object is to provide an improved convertible pump having a combined airseparating and priming l chamber .containing a jet pump unit, the latter being presented to the suction side of the centrifugal pump unittogether with a device forintroducing air tothe centrifugal pump.

Still another object is to provide an improved pump, convertible from shallow to. deep Well and vice-versa, having a combined air separating and priming chamber containing a jet pump unit presented tothe suction side of a centrifugalrpump unit, together wih a device for introducing'air to the centrifugal pump and in which conversion of the pump from shallowto deep well can be accomplished without interfering -in any Way with the air introducing/device.

Another object is'to providea pump'of the type noted having a combined air separating :and

inlet device connected to the suction inlet of the centrifugal pump-andremovable With the pump from the chamber when itis desired to inspect 0r replace any of ,theparts Figure v3;

vAnother object of my invention is to provide a pumping system in which the pressure or centrifugal pump is mounted with its axis of rotation horizontal and Which comprises the'combination of a jet pump, a'press"ure"pump,yand a combined air separating and priming chamber containing each of the jet and pressure pumps so arranged that when converting to deep Well use the jet pump parts can be removed as av unit from the chamber without disturbing either the chamber or the pressure pump. -f

A further Object of the invention is to provide a pumping system in which the pressure'v or centrifugal pump'is mountedwith :its axisr of rota tion horizontaland -discharging into v a chamber of relatively large size containing a jet pump unit in communication with the chamber and so constructed and-arranged-that the jet pump A.unit can be removed from thech'amber -at one side thereof ^and the pressure pump can be .removed from the chamber at the other side thereof.. I f y y The general and nal object of my inventionis to provide a jet type pumping apparatus or system including a combined air separatohpriming chamber of relatively large size and .which may be converted from a shallow well pumping system to a deep Well pumpingsystem o r v'icefversa at considerably less expense than the apparatus or systems on the market and readily Vvaccomplished by a farmer or other mechanically'unskilled person without necessitating the dismantling of the pump.

Other objects and advantages of my invention will be apparent as the specification is perused in connection with the accompanyingdrawings in which: i

Figurel representsr a side relevational View, partly in section, of the general assembly of the improved pump when setup for shallow Well operation;

Figure 2 is ay sectional Adeitailed view, partly in i elevation, -of .the air volume r'control :apparatus adapted for use in the pump shown in Figure l; Figure 3 is a sectional view ofthe jet pump unit used in the shallow installation; l,

Figure 4 is an elevational viewlooking toward the left-hand end of the jet pump shown in Figure3; Y Figure 5Y is an'elevational Viewlooking toward the right-hand end of the jet' pump' sho'win Figure 6 'is a sectional view of la detail coupling used in'placeof the jet pumpfof'Figure 3-when the main-pump assembly is being "converted" to deep well operation; Y

Figure 'I is an elevationalview looking'toward the left-hand end of the device' shown in Figure 6;

Figure 8 shows diagrammatically the general pump assembly when set up for shallow well use; and

Figure 9 represents, in part diagrammatically and partly in section, the pump assembly when arranged for deep well use.

Referring more particularly to'Figurerl, the

'pump assembly includes the three main parts,

the motor generally designated at vI,.t11e motor bracket designated at 2 and the combined air separating-priming chamber generally indicated at 3. The motor may be of any suitable type and has attached thereto a pressure operated switch 4 which serves to interrupt the electrical circuit (not shown) to the motor when the pressure in the chamber 3 becomes greater than a predetermined amount as will bedescribed more fully hereinafter. The mounting flange of the motor is attached 4to the bracket 2 by means of bolts 5 which pass through bossed portions of the bracket into the motor mounting iange.

The bracket constitutes a hollow casting provided with spacedv ribs 6 and terminating at the bottom in feet 'I which may be bolted to a foundation at the position of the heavy washers 8. There are open spaces between the ribs 6 and these spaces aretemporarily closed to prevent dustfror'n entering by means of a sheet steel ilexible covering 9 which is 'positioned between shoulders- I0 and theends of which are attached to the bracket byr'means of screws lI I. y .y

The motor is provided with a shaft I2 Which is snugly received by an apertured shoulder I3 having set screws-I4, this shoulder being formed by an extension of an impeller shaft I5 which terminates in a threaded plug -portion I6.y The shaft- I5 extends through-a suitable seal I'I and carries at its end an impeller I8 of any suitable and Well-known type which constitutes a pressure pump. This impeller contains vanes I9 ,and a suction inletconduit 2U. There is a pump casing 2I positioned about the impeller, the righthand half of the casing terminating in a hub 22 for receiving ,the seal-member I'I. This portion of the pump casingmay lbe formed integral with the motor bracket 2 inone completecasting as indicated on the drawings. The other half of the casing terminates in a threaded shoulder 23.

. This lshoulder portion is provided with an annular recess 24V vforreceiving a rubber bearing 25 immediately surrounding the suction inlet member 2|] of the pump. The peripheral portion of the left-hand casing member terminates in an annular vane plate which provides spiral passageways for the water leaving the impeller and discharges this water through suitably positioned ports (not shown) into the chamber 3. The left-hand casing half ,can be detachably secured to the right-.hand portion of the casing and therefore tovthemotorlbracket 2 by means of suitably positioned bolts 21. 1

The combined air separatorfpriming chamber 3 may be formed of a relatively large hollow casting 28 which is completely closed .except for relatively small threaded openings for receiving pipes, `as will be explained hereinafter, and also except for a centrally disposed opening 29 in the right-hand Wall for snugly receiving a shouldered surface 30 of the motor bracket 2. The latter can be detachably secured to the wall of the casing by means of suitably positionedbolts 3I which Vbear against bosses. 32 yformed on the interior of the bracket casting.

The casting '28 is provided witheribs indicated at. 33 for strengthening, purposes. A threaded bore is. adapted detachably'to receive the threadedshank 40 of a jet pump which is ycomprised essentially of a nozzle`4l and a diffuser 'orf'v'enthreaded countersunk opening 44 for receiving the threaded end of :a pipe 45 (Figure'l) constituting the suction conduitl which normally passes down into the well as indicated in Figure 8. If desired, a a foot valve maybe ernployed at the bottom of the suction pipe in the well in order to maintain the primingchamber 3 filled with'water. The shank 'portion 4i) of the jet pump unit is provided with a reentrant passageway 46 (Figure 3) of curvilinear shape :and terminating in a ycircular opening 41 which is in line with the interior of the nozzle element 4|.

The latter is threadedly vreceived as indicated at 48 by the reentrant portion of the member 40 and a hexagon collar 49 may be provided sofas .to assist in tightening .the nozzle element into the body 40. The tip 50 ofthe nozzle is of smaller size than the inwardly flaring portion 5I of the diiuser 42 so as to leave an annular space around the outer surface of rthe nozzle. This space communicates throughv a semi-circular;

passageway 52 -with the opening 44 so that a free passage is established between the suction pipe 45 and the interior ofy the diffuser 42 around the nozzle 4I. Inv addition, communication is also established between the interior'of the chamber 3 and the interior of the nozzle 4| through the passageway 45. In order that the water flowing from the chamber 3 to the nozzle interior is directed gently toward the passageway 46 the chamber 3 may be provided with arfslantedpr tapering surface indicated at 53, thus insuring no eddy current or intense friction losses.

The diffuser 42 is provided with an annular projection 54 having a circular groove 55 for receiving a washer 56, preferably of circular cross-sectional area. The projection 54 vprovides an abutment 51 for making a tight joint with the body 40 when the diluser is screwed as indicated at 58 into that body portion.

To facilitate this screwing eiect, a hexagonally-shaped portion 5d may be furnished on the diffuser to receive a wrench. It is therefore seen that when the body portion 4the nozzle 4l and the diffuser 42 are detachably joined together at the threads 48 and 58, the positional relationship between these parts is absolutely fixed andy that by merely unscrewing the body portionat the threads 39 in the wall of the chamber 3, the

entire unit, including the nozzle and the diffuser can be removedirom the interior of the chamber, leaving merely a threaded opening in the wall. The purpose of this .opening in connection withA the conversion of the pump to deep well will be explained hereinafter.

There is a metal tube 60 (Figure 1) 23 rto the left-hand half of the pump casing, this tube fitting snugly about the washer 56 and extending preferably to a position just beyond the shoulder or projection 54 but not covering up the opening 46. A coniined annular space is thus presented about the outside surface of the diffuser 42. Thetip 6l of thediiuserhas-a diameter somewhat less than the diametral sizeof the impeller inlet tube 2i) and .the space between thetube 60 and the diuser-42 is in vcommunithreaded atv 6 lcation vvwith' the suction inlet of the pressure pumpllus.

`Inzadditionfto the large threaded lopenings 31, "39, the chamber 3 has a threaded opening 62. at ithe vbottomfside which is vshown as receiving-a plug T63.

'It is '-welll'known that in order to provide an air cushion at the topof va pneumatictankrto supply continuous pressure to the stored water, some-form of automaticair volume controlmust befemployedvbywhichair is introduced into the 'tank at apredetermined rate, dependent on the loss of air froxnthe tank when the water is being discharged :to the `service pipes. For this Ypurpose there is provided a copper tubing 64 passing through the wall of cylinder `|50 and brazed thereto as Aindicated atv 65, this tubing beingexible as indicated by its curvilinear shape `in FigureZ and inserted into a slidably fitted 'ope-'ning GS'formedrin -the'vane plate. This opening communicates with an elbow 61 threadedly secured to the left-hand wall of. thermotor 'bracket2. There is a pipe B3 lwhich leadsrinto tha-elbow Vthrough-a Schrader valve 69 and iis connected to an air volume control valve 10 vof any suitable `and well-known type secured toa pneumatic tank indicated at 1 I By means of a oat mechanism within the tank which moves in accordance with changes in level of water and therefore representsthe change in the amount of air at the top of the tank,a `valve is opened to admit air tothe `pipe '68 and this airgpassesithrough the tube E4 .and iinallyreaches the suction inlet of the pressure pump as explained hereinbefore.

The casting 28 is provided with. a relatively "smallropening 12 ata position near the threaded opening `31 for-receiving a pipe coupling 13 Aattached to asmall conduit or pipe 14 leading to `vthe pressure responsive switch A4 on the .'motor.

`As lthe pressureofrthe fluid in the chamber 3 exceeds a predetermined amount, this pressure .iscommunicated-'to the uid in the pipe l.14 to `cause the switch .4 to .break the circuit leading to theimotor il. i lWhen water is drawn oif'at the pipe-'pwhich may be a service pipe or may lead e to a pneumatic pressure tank so as to reduce'the `pressure .of the Ifluidin theY chamber l3, 'the reductioninpressure causes the switch 4to become energized randreestablish themotor circuit. Thegauge 35'has no automatic featurefbut is used simply to show the priming conditions of the pump in terms of the pressure of the fluid inthe chamber3.

The setup shown in`Figure 1 is intended for Ashallow well use, i. e. 'for suction Aheads no greater lthan-"20 to 25 it. In order to adapt the pump structure to deep well operation, i. e. above2-5 ft., itdsobvious that the jet pump must be removed andzplaced downrnea'r the water inthe we1l,pref

erablyvsubmerged, in orderto combine the lifting effects-of the jet-pump with the suction'e'ff'ect of thefpressure pump. F'or this purpose anaccessory or-adaptor is provided for replacing the jet lpump an'dwthis accessory is shown in Figures 6 and y'1. It consistsmainly in a multi-shouldered tube offmetal having a hexagon head 15 Vthreaded as indicatedat 16 .toreceive the delivery pipe 11 `from `the submerged jet Dump. There is a 'threaded shouiderlzfor engaging thethreads of thebore39.

The purpose of this plug lwillbe de# scribedhereinafter.

'8| snugly `fits against the cylinder 60 and, as in the case of the washer 56, serves to prevent any uid from moving toward the left in the cylinder 60. It is obvious that when the tube accessory shown in Figure 6 `is screwed into the casting 28,

assuming that the jet pump 4|, 42 has been previously removed, the opening 82 in the tube is directly in line with the axis of the `cylinder 6D and therefore coaxial with the suction inlet of the pressure pump I 8. Inasmuch as the washer 8| is positioned within the cylinder to the left of the tubing 4(i4 and its Schrader valve, the air control device is no-t disturbed but is available for deep well 'use as yfor shallow Well operation.

The plug 63 at the bottom of the chamber 3 removed to receive fthe threaded end of a pressure pipe 83. The jet pump for deep well operation is usually positioned just below the level of the water in the well or other source of fluid and *mayl comprise a nozzle 84 and a cooperating diffuser or venturi 85. The pressure pipe 83 is connected lthrough :an elbow 86 and a dro-p pipe 81 lto "a body casting 88 having a curved passageway which terminates at the nozzle 8f4. The tip of the nozzle is spaced a'distance from the lower end of the diffuser 85 to leave an annular space 89 which communicates through passageways in the casting 88 to a, suction compartment .90. This compartment is in communication through a pipe 9| with a foot valve structure 92 of any suitable and well-known .type which terminates at the bottom in a strainer 93.

The diffuser 85 may `compri-se `a tubing of hard ber or metal and is detachably secured .within 'a pipe 94, the latter being connectedthrough an extension 95 and an elbow 96 to the delivery pipe 11.

It is therefore apparent that in order to change over the shallow well structure as shown in Figures 1 and 8 to deep well operation i-t is necessary to replace the jet pump elements 4|, 42vwhich are normally contained within the chamber 3, by the tubular adaptor shown in Figure 6 and then remove the plug 63 and substitute therefor the pressure pipe 83. -In removing the shallow well jet pump unit, it is simply necessary to unscrew the member 40 .to leave the opening 39, at which time the jet pump can be freely withdrawn through the opening without ldisturbing lthe casing or chamber 3 and also without affecting the air control valve connection 64.

The operation of the pump is essentially the same for shallow and deep well use except for the change in position of the jet pump. Combined waiter and air entering the suction pipe 45 flows -past the outer surface of the nozzle 4| into the space thence through the venturi 42 into the suction inlet of the pressure pump. The water is delivered under pressure at the discharge openingsof the vane plate 26 into the combined air separator and priming chamber 3. The sepaf rated air rises to the top of the cham-ber and flows out through the main discharge pipe 36 together with the service water. This pipe may be conF nected to a pneumatic pressure tank and the air contained in the water collects atrthe top of the tank to provide a pneumatic cushion. The water Vfrom which air has been separated ows downwar-diy through the opening 46 to the bore in fthe nozzle 4| and creates ya suction `effect between the knozzle and the diffuser sufficiently intense that -s-not"sufcient to4 provide the necessarypresl sure to service the water, the -automatic air volunie control 'I0 will opera-te to ladmit additional air through the tube 64 and the Schr-ader valve 69 into the cylinder 60. This air in traveling through the pressure pump, isv separated in the chamber 3 from the water, finally passing out through the pipe 36 to the tank.

It will be noted that the jet pump unit is contained entirely within the chamber 3, or rather, this chamber has been greatly enlarged so as to extend to the rear of the jet pump. Moreover, the main discharge pipe 36 is taken out from the chamber, as close to the top as possible and the vnozzle 4| of the jet pump is positioned remote from the main discharge pipe.

From the structural standpoint, the improved pump offers distinct advantages in that not only can the jet pump be readily removed from the casing in the manner described, but thev pressure pump can also be readily detached from the casing 3 for inspection or replacement purposes. This is readily done by removing or loosening the bolts 'or cap screws 3| (assuming that the pipe coupling 'I3 leading to the switch 4 has also been disconnected) at which time the motor bracket 2 and the motor can be moved relative to the casing 3, carrying with it the entire pressure pump structure including the cylinder 60. In order to obtain 'access to the cap screws 3|, it will be necessary vdisassembled by removing the cap screws 21.

Inasmuch as the end of the tube 64 is brazed in the cylinder 69, it might be 'diiiicult to insert the opposite end of the tubinginto the opening 65 in the vane plate and for this reason it is desirable to make the tubing 64 of flexible material as indicated, particularly in Figure 2, so that regardless of the peripheral position of the brazed end with respect to the opening 66, the tubing can be `V readily inserted into the opening` When the pump is arranged for deep well operation, including the insertion of the tube element 19 (Figure 6), and assuming that the jet pump body 88 is submerged in the water of the well, the water passes through the foot Valve 92 into the spaces 90 and 89, thence up through the diffuser to the inlet conduit 20 of the pressure pump. Air is separated from the water in the chamber 3 as explained hereinbefore and the treated water flows to the bottom of the chamber and through the pipe 83 to the nozzle 84 in order Vto enhance the suction effect between the nozzle and the diiuser. Thus the submerged jet pump assists the pressure pump in lifting the water through the deep well pipes and the separated rair and water flow out through the service pipe 36. It will be` noted that the air control device functions equally well for deep as for shallow well operation because in both cases the pipe 64 is in communication with the suction side of the pressure pump.

It will be further observed that the position within the chamber 3 at which the separated air collects, namely at the top of the chamber, is remote from the position at which water is Withdrawn from the chamber to drive the submerged jet pump, so that the water arriving at the nozzle 84 has' had the objectionable part of the air re- 'moved. The pressure pump will therefore never 59.5 tion tojserving as an eectivefair separator, serves the function of a priming chamber to the extent that a considerable head .0f Water is always maintained'on the pressure pump, assuming that the chamber is initially filled with water and thislast mentioned condition is assured by the use of the foot valve 92 which prevents anyvvater from dropping out of. the pipes 11,83, The vSuction pipe 45 of the shallow well installation is" also preferably provided with a foot valve (not shown) for the reason given immediately above.

It will be understood that various modiiications and arrangements in structure could be made without departing from the spirit of my invention and, accordingly, I desire to comprehend such modifications and substitutions of equivalents as may be considered to come within the scope of the appended claims.

I claim:

1. A pumping apparatus comprising a pressure pump having inlet and discharge openings, a removable jet pump presented to the inlet opening of the pressure pump, a combined air separator and priming chamber communicating with the discharge opening of the pressure pump and with the jet pump in order to supply substantially air free water to the jet pump, a cylinder surrounding a portion of the jet pump and coaxial with the inlet opening of the pressure pump leaving a space between the cylinder and the jet pump, and means including a conduit fixedly secured to said cylinder for supplying predetermined amounts of air to the space between the cylinder and the jet pump, the size of the inlet opening of the pressure pump being greater `than the size of the jet pump in order to leave an annular space through which the introduced air can flow into the pressure pump, and said air-introducing conduit being adapted to remain fixed to said cylinder when the jet pump is being removed from said cylinder.

2. A pumping apparatus comprising a pressure pump having inlet and discharge openings, a removable jet pump formed of a nozzle and a cooperating diiuser, said diffuser being presented to the inlet opening of the pressure pump, a combined air separator and priming chamber communicating with the discharge opening of the pressure pump and with the nozzle of the jet pump, means for supplying the space between said nozzle and diffuser with uid, a main discharge pipe connected to said chamber, the jet pump being contained within the chamber, a cylindrical member surrounding a portion of the jet pump to leave a space communicating with the inlet opening of the pressure pump beyond the diiuser, and means including a conduit fixedly secured to said cylinder for supplying pre'- determined amounts of air to the space within said member in order to provide pneumatic pressure effects to the water discharged through said main discharge pipe, and said air-introducing conduit being adapted to remain fixed to said cylinder' when the -jet pump is being removed from said cylinder.

3. in a convertible deep and shallow well pump, the combination of a distribution casing having a pair of spaced, opposed walls, a pressure pump operatively mounted in one of the walls and having a suction inlet and a pressure outlet, saidoutlet communicating withsaid casing, a ypair of openings in the other of said Walls, a fitting in one of said openings in line with the suction inlet of the pump, and a removable plug in the other of said openings, a tubular member extending overl at least abortion., of nSaid .casing andsupported at one end ;bythe .pump, `a removable jet pump` assembly contained, at least in part, within the tubular mem-ber and presented to the suction inlet of the pressurei'p'ump, said jet pump v assembly. comprising anozzle and a diffuser in spaced relationship and supported.- at one-end by said fitting, said v nozzle being vin,

with the interior Yof sav'd' casing andthe space betweensaid nozzle and diffuser. being connected togan externalsource of uidithrough said fitting, and a main discharge opening in said casing, said tubular member being of greater size than the jet pump assembly to leave an annular space therebetween a sealing ring in said space, posi#- tioned between the member and the jet pump, near one end of the jet pump, that po-rtion of the annular space between the sealingring and the pressure pump being in communication with the suction inlet of the pressure pump, and means for supplying predetermined amounts of Aair from the atmosphere into said portion of theannular space between the sealing ring and the pressure pump in order topresent this air to the suction side of the pressure pump.

4. A pumping apparatus comprising a pressure 'pump having inlet and discharge openings, a jet pump formed of a nozzle and a diffuser in spaced relationship, said diffuser beingpresented to the inlet opening of the pressure pumppa combined air separator and priming ychamber communicating directly with the discharge opening `of the. pressure pump and with said nozzle, means for means includinga tubing secured to said tubular member for supplying said space with predetermined amounts of air from the atmosphere. 5. In a convertible deep andshallow well pump, the combination of a distribution casing having a pair of spaced, opposed walls, afpressure pump operatively mounted in one of the Walls and having a suction inlet and avpressure outlet, said outlet communicating with saidcasing, a pair of openings inl the other ofv said walls, a ttingin one of said openings in line with the suctio'ninlet l of the pump, and a removable plugin the other of said openings, a tubular member extending at least over a portion of said casing and supported at one end by' the'pump, 'a removable jet pump assembly supported by saidiitting and mounted,

at least in part, within the tubular member andv presentedy to' thefsuction inletr of the. pressure pump, said jet'pump comprising a nozzle and a v' diruser in spaced reiationship, said nozzle being in communication with the interior of said casing f vand the space between said nozzlev and diiluserl being connected to an external source of iiuid sure pump, and Ameans including al conduit secured to said tubular member for introducing controllable amounts of air to the interior of said t munication member in order that the air will ow into the Number suction side of the pressure pump. 2,174,960

- WILLIAM J. CONERY. 2,225,789

. REFERENCES CITED 5 2,335,109

' The following references are 4of record in the 13311540 fue of this patent:

UNITED STATES PATENTS 2549213 Number Name Date Conery et al. Apr. 13, 1937 Name Date Barzen Oct. 3, 1939 Metcalfe et al Dec. 24, 1940 Lung Mar. 3, .1942 Conery Nov. 23, 1943 Brandstrom Aug. 7, 1945 Ruth July 9, 1946 Wolfe et a1 July 5, 1949 vMcBean Apr. 17, 1951

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