US3112706A

US3112706A - Integrated jet pump structure

Info

Publication number: US3112706A
Application number: US168013A
Authority: US
Inventors: William J Ekey
Original assignee: FE Myers and Bro Co
Current assignee: FE Myers and Bro Co
Priority date: 1962-01-17
Filing date: 1962-01-17
Publication date: 1963-12-03
Anticipated expiration: 1980-12-03

Description

Dec- 3, w J EKEY INTEGRATED JET STRUCTURE 3 Sheets-Sheet 1 Filed Jan. 17, 1962 FIG-I IRL ' INVENTOR. FIG-3 it Z M f MW ATTO RN EYS Dec. 3, 1963 w. J. EKEY INTEGRATED JET PUMP STRUCTURE Filed Jan. 17, 1962 3 Sheets-Shed: 2

INVENTOR. JZ EKEY ATTORNEYS W. J. EKEY INTEGRATED JET PUMP STRUCTURE Deg 3, 1963 3 Sheet-Sheet 3 Filed Jan. 17, 1962 WILLIAM J. EKEY ATTORNEYS Unite Faterttecl Dec. 3.; 1963 Myers 12% Re. (30., ushland, @hio, a corporation of Ghio Filed 17, 3962, der. No. 168,913 9 {:Jl. ltl387) This invention relates to centrifugal pumps and, more particularly still, to a centrifugal pump and drive motor combination forming an integral unit. 7

The primary object of the present invention is the provision of a centrifugal pump which is jet assisted which carl readily be converted from shallow well to deep well operation.

Another object of this invention is the provision of the combination of a centrifugal pump and a drive motor therefor which is integrated into a single unit thereby resulting in an extremely compact construction.

Still another object of this invention is the provision of a centrifugal pump and motor combination in which various parts are integrally combined with other parts thereby resulting in a minimum number of castings.

Still another object of this invention is the provision of a centrifugal pump arrangement in which the water pumped by the pump cools the bearings of the pump and also cools the seal area to provide for good operating conditions of the pump.

A still further object of this invention is the provision of a centrifugal pump with a take-off for supplying fluid to an assisting jet pump in which the fluid take-01f is so arranged that substantially ah" free water is delivered to the ejector of the jet pump.

These and other objects and advantages of this invention will become more apparent upon reference to the following specification, taken in connection with the accompanying drawings, in which:

FIGURE 1 is a perspective view showing a pump according to the present invention arranged for deep Well operation;

FIGURE 2 is a longitudinal vertical sectional view indicated by line 2-2 on FIGURE 1;

FIGURE 3 is a transverse sectional view indicated by line 33 on FIGURE 2;

FIGURE 4 is a vertical sectional View indicated by line lon FlGURE 1;

FIGURE 5 is a fragmentary perspective view showing how the difiuser of the pump is formed integrally with the pump cover plate;

FIGURE 6 is a perspective view of a modified arrangement of a pump according to the present invention;

FIGURE 7 is a longitudinal section through the pump of FIGURE 6 as indicated by line 7-7 on FIGURE 6;

FIGURE 3 is a fragmentary view showing one manner of constructing a panel mounted on the motor and which carries the control devices for controlling the operation or" the pump; and

FZGURE 9 is a view like FIGURE 8 but shows a dilferent arrangement of the said panel.

Referring to the drawings somewhat more in detail, in FIGURE 1 there is shown a receiver tank 1% adapted for being supplied by a centrifugal pump 32 that is driven by an electric motor 14. Pump 12 has an inlet conduit 16 leading thereto and a conduit 13 leading therefrom for supplying water under pressure to the jet of a jet pump. The jet pump is indicated generally at 29 and the conduits l6 and 18 are connected to one side thereof while a suction conduit 22 leads from the other side thereof into a well.

Referring now to FIGURE 2, the pump 12 comprises a main casting 24 that is provided with an outer chamber portion 26 having a threaded hole at the top for receiving conduit means 28 that connects the pump with receiver tank 10. Casting 24 at the back has a cylindrical portion 38 extending therefrom which serves as the casing for the electric drive motor 14. The cylindrical portion 3% has a shouldered cylindrical bore 32 therein into which is pressed the stator frame 34 of the electric motor.

The electric motor also comprises a rotor 36 which rotor is pressed on a shaft 38 that has no bearing at its left end. Instead, the shaft 38 is supported in sealed bearings 49 which are fitted into a hub 42 which also forms an integral part of casting 24. The hub 42 is formed in the back wall 44 of chamber 26 and which wall also forms one end wall of the electric motor compartment.

The outer end of the motor is enclosed by a sheet metal cover 46 which telescopically engages the outer end of portion 39 of the main casting of the pump. This portion of the pump may comprise recess means :8 and the sheet metal cover may include indentations 59 so that the cover can be snapped in place on the main pump casting and retained thereon. A screened air inlet opening 52 is provided for the circulation of air through the motor by means of fan 54 carried by the rotor. The air so drawn into the motor passes therethrough and then emerges through the slots 56 formed about the bottom part of the cylindrical portion 3% of the pump casting.

The control wires 58 for the motor lead through the top of the motor housing and into a casing ea in which there may be mounted a pressure switch.

Located inside chamber 26 and attached to the aforementioned hub portion 42 is a generally conically formed section 62 that defines a space within which the pump impeller he runs. This pump impeller is mounted on the threaded end 66 of shaft 38 for being driven in rotation thereby. Between the impeller and the bearings there is preferably provided a fluid seal as to prevent or inhibit fiuid leakage along shaft 38 from the pump end thereof toward the motor end thereof. Any leakage of fluid getting past seal 63 is prevented from reaching bearings 449 by the provision of a small chamber 763 between the seal and the bearings that is drained by passage '72 leading downwardly therefrom.

According to the present invention, the extreme outer wall ofcasting 24 is provided with an aperture 74 for receiving an inlet plate or cover plate 7s for the pump. This plate has an inwardly extending cylindrical part 73 that engages an annular planar surface 86 on the adjacent face of the conical section as so that the inlet plate or cover plate defines with the conical section a closed chamber in which impeller 64 rotates.

A feature of this invention'is illustrated in FIGURES 3 and 5 wherein it will be seen that the inner side plate 78 has integrally formed thereon the arcuate vanes 82 that form the diffuser section through which the fluid pumped by impeller 64 passes from the periphery of the impeller into chamber 26. The forming of the dilfuser vanes integrally with the plate 76 eliminates the necessity of the provision of any separate member for the diffuser.

The plate '76 has an outwardly extending boss-like portion 3- 5 having a flat surface 86. On the axis of shaft 36 and extending through portion 84 is a threaded port 33 which receives conduit 16. Located at a lower point and also extending through portion 34 is a threaded port 99 for receiving conduit 18.

The impeller ss has an axial flange 92 running closely inside bushing 94 mounted in plate 76 and through which axial flange fluid communication is established between the interior of the impeller and the port 88 so that inlet fluid passing through port 88 will move directly into the impeller and be pumped thereby through the diffuser and into chamber 26.

For supplying substantially air free fluid to port fill, there is a port 96 at substantially the lowermost region of vanes 25 that communicates with a chamber 9% leading to port 9i By this connection, substantially air free Water under pressure can be delivered to port 90.

The plate 76 is secured to main casting 24 by bolts distributed about the periphery thereof as will be seen at lilll in FIGURES 1 and 3.

FIGURE 4 shows the inductor assembly when it is arranged for deep well operation. In this view, it will be seen that the jet pump 2% comprises a first body part 102 having an inlet pipe or conduit 22 attached to one side and, at its other side, having a fiat surface 166 to which is connected a second body member 1%. Second body member 1&8 has threaded ports for receiving conduit 18 that communicates through the body parts with a jet 11d.

Body part 108 threadedly receives conduit 16. Conduit 16 communicates with a chamber 112 that is connected with chamber 114 of body part 102 that leads to conduit 22.

Chamber 114 also communicates with the inlet end of a venturi tube 116 attached to body part H12 and extending into conduit 16. Nozzle 116 directs its jet into the throat of venturi tube 116.

The arrangement is such that body part 102, which is secured to body part 168 by bolts 118, can be detached from body part 198, and, instead, mounted on the flat face se of portion 84 of the main pump casting. With body part 192 mounted in this manner, port 99 will communicate with the chamber leading to the nozzle while chamber 114 of body part 102 will communicate with port 88. A venturi tube of a suitable design threaded into the threaded opening 124) of impeller 64 will then be positioned to receive the jet from the nozzle and this will convert the pumping assembly to shallow well operation.

FIGURES 7 through 9 show a somewhat modified arrangement wherein the main casting is indicated at 2%. This main casting has a rearwardly projecting generally cylindrical portion 292 in which is mounted stator 2&4 of an electric drive motor that has a rotor 2436 fixed to shaft 208. Shaft 24% extends through bearing means 210 carried in a hub 212 of the main body casting, said shaft extending completely through the bearing and carrying the pump impeller 214 disposed at the face of the conical portion 216 of the main casting. The cover plate means 218 that confines the impeller is the same as that disclosed and described in connection with the first modification.

In FIGURE 7, however, the hub 212 is spaced from the wall portion 229 at the smaller end of the conical portion 216 and in wall portion 220 is the seal 222. The hub 212, on the other hand, is located in another wall portion 224 that is spaced from wall 22% so that there is defined between the said walls passage means 224 through which cooling air can circulate as indicated by arrow 226.

As in the case of the first modification, there is a sheet metal cover 228 enclosing the outer end of the motor with this covering including an air inlet opening screened by a screen 230.

In the FIGURES 7 through 9 modification, the main casting of the motor comprises a flat side Wall 232 adapted for detachably supporting a panel 234- which is illustrated in FIGURE 8. A cover member 236 (FIGURE 6) is adapted for detachably mounting on plate 234. Plate 234 carries the operating auxiliaries for the motor of the pump, such as the pressure switch and relay and, if the motor is a condenser start motor, the said condenser.

In the FIGURE 8 modification, all of these auxiliaries are mounted on the outer side of the panel whereas, in FIGURE 9, which shows a similar panel 236, at least one of the auxiliaries 238 is mounted on the back of the panel and is thus disposed in a cavity in the main casting. Panel 236 has a pressure switch mounted on the outer face thereof.

From the tforegoingit will be seen that the present invention provides for an extremely compact and low cost pump which consists of a relatively few and easily machinable parts readily convertible from deep well to shallow well operation and vice yersai Substantially air free water is provided in either case for the inductor assembly.

It will be understood that this invention is susceptible to modifications and in order to adapt it to different usages and conditions and, according y, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended clm'ms.

I claim: 7

1. In a centrifugal pump, a main body part having a hub, an impeller shaft journaled in said hub, an impeller on said shaft, an inner body portion extending from one side of the hub to enclose the back of the impeller, an outer body portion extending from the hub outwardly in spaced surrounding relation to said inner body portion and defining with said inner portion a chamber for receiving liquid pumped by the impeller, an inlet plate fixed to said outer body portion to close said chamber and having a portion engaging said inner body portion and confining the periphery of the impeller of the pump, difiuser means formed on the impeller side of the inlet plate about the periphery of the impeller for conducting fluid from the periphery of the impeller to said chamber, a cylindrical projection integral with said outer body portion and on the side of said outer body portion opposite said inlet plate, and an electric motor stator in said projection.

2. 'In a centrifugal pump; a unitary main body part having a hub for rotatably receiving a drive shaft, a drive shaft rotatable in the hub having a pump impeller on one end and a motor rotor on the other end, an inner body portion extending from the hub to a position adjacent the periphery of the impeller, an outer body portion extending from the hub outwardly in surrounding spaced relation to said inner body portion, said body portions defining therebetween a chamber for receiving liquid pumped by said impeller, said body portions having parallel flat rims at their ends opposite said hub, an inlet plate engaging said rims to close said chamber and to confine the pump impeller, diffuser means formed integrally with said plate around the periphery of the impeller to conduct fiuid from the impeller to said chamber, a cavity in said plate adjacent the bottom of the chamber, port means in the plate connecting the cavity with the chamber to receive substantially air-free water under pressure from the chamber, a cylindrical projection coaxial With and integral with said hub extending in a direction from the hub opposite said body portions, and a stator for said rotor in said projection.

-3. In a centrifugal pump; a unitary main body part having a hub, bearings in said hub, a drive shaft supported by said bearings having a motor rotor on one end and a pump impeller on the other end, an inner body portion integral with the hub extending axially and outwardly therefrom to adjacent'the periphery of the impeller to form a conical shroud for the back of the impeller, an outer body portion integral with and extending from the hub outwardly and then axially in spaced suround ing relation to said first body portion to define a chamber to receive liquid pumped by the impeller, said body por tions terminating at their ends opposite the hub in rim portions which are parallel to each other and perpendicular to the axis of the hub, an inlet plate engaging said rims to close said chamber and to confine the pump impeller, diffuser means integrally formed on the plate extending about the periphery of the impeller to conduct fluid pumped thereby to said chamber, an inlet port in said plate communicating with the eye of the impeller, a cavity on said plate for supplying fluid to the nozzle of a jet pump, a channel leading from said cavity to the bottom of said chamber for supplying substantially airfree liquid to said cavity, a cylindrical projection integral with said body part and projecting therefrom on the side of the hub opposite the impeller coaxial with the hub, and a stator for said rotor and said projection.

4. In a centrifugal pump; a pump casing having a hub, a shaft extending through the hub having a motor rotor on one end on one side of the hub and a pump impeller on the other end on the other side of the hub, bearings on the shaft in the hub forming the sole support of the shaft, a conical casing part integral with the hub and extending therefrom to adjacent the periphery of the impeller, an outer casing part integral with the hub and extending outwmdly and then toward the impeller so as to be in spaced surrounding relation to said conical casing part, said parts terminating in rims parallel to each other and perpendicular to said shaft, an inlet plate engaging said rims and closing the chamber between said parts and also enclosin said impeller, a difiuser integrally formed in said plate around the periphery of the impeller to conduct liquid pumped by the impeller to said chamber, an inlet passage in said plate leading to the inlet of the impeller, a cavity in said plate, passage means leading from sad cavity to the bottom of said chamber for the supply of substantially air-free liquid un er pressure to said cavity, said casin including a cylindrical part integral with and coax al with said hub extending from the side of the casing opposite said inlet plate, a stator supportin ly engaged by said cylindrical part and surrounding said rotor, and a cover member enclosing the outer end of the stator and rotor.

5. a centrifugal pump; a pump casing having a hub, a shaft extending through the hub having a motor rotor on one end on one side of the hub and a pump impeller on the other end on the other side of the hub, hearings on the shaft in the hub forming the sole support of the shaft, a seal in said hub between said bearings and said impeller, and a drain passage leading from the hub between said seal and said bearings, a conical casing part integral with the hub and extending therefrom to adjacent the periphery of the impeller, an outer casing part integral with the hub and extendin outwardly and hen toward the impeller so as to be in spaced surrounding relation to said conical casing par-t, said parts terminating in rims parallel to each other and perpendicular to said shaft, an inlet plate engaging said rims and closing the chamber between said parts and also enclosing said impeller, a diffuser integrally formed in said plate around th periphery of the impeller to conduct liquid pumped by the impeller to said chamber, an inlet passage in said leadhig to he inlet of the impeller, a cavity in said plate, passage means leading from said cavity to the bottom of said chamber for the supply of substantially airfree liquid under pressure to said cavity, said casing including a cylindrical part integral with and coaxial with said hub extending from the side of the casing opposite said inlet plate, a stator supportingly en aged by said c "drip l part and surrounding said rotor, and a cover 1; L. oer enclosing the outer end of the stator and rotor.

6. in a centrifugal pump; a pump casing having a hub, a shaft ext-en i g through the hub having a motor ;or on one end on one side of the hub and a pump impeller on the other end on the other side of the hub, arings on the shaft in the forming the sole support e shaft, 0.

conical casing part integral with the hub therefrom to adjacent the periphery of ler, an outer casing part integral with the hub and extending outwardly and then toward the impeller so as to be in spaced surrounding relation to conical casing part, said parts terminating in rims parallel to each other and perpendicular to said shaft, an nlet plate said rims and closing the chamber between said parts and also enclosing said impeller, a difiuser integrally formed said plate around the periphery of the impeller to conduct liquid pumped by the impeller to said chamber, an inlet passage in said plate leading to the inlet of the impe er, a cavity in said plate, passage means leading rom said cavity to the bottom of said chamber for the supply of substantially air free liquid under pressure to said cavity, said casing including a cylindrical part integral with and coaxial with said hub extending from the side of the casing opposite said inlet plate, a stator supportingly engaged by said cylindrical part and surrounding said rotor, and a cover member enclosing the outer end of the stator and rotor, a substantial portion of the length of said hub being located in said chamber so as to be in direct heat transfer relation with the liquid therein.

7. A casing for a centrifugal pump, said casing comprising a unitary casting having a central cylindrical hub portion, bearings in said hub portion at one end and a seal in said hub portion at the other end, a pump drive shaft in the hub portion supported by said bearings and sealed therein by said seal, a pump impeller on said shaft, said casing comprising a first portion extending outwardly from the said other end of the hub for enclosing the back of the pump impeller, said casing comprising .a second portion extending from the hub adjacent the said one end thereof, said second portion extending generally radially outwardly and then toward the said other end of the hub so as to be in surrounding relation with the said first portion whereby to define a space for receiving liquid pumped by the pump ii peller and which liquid surrounds a substmtial portion of the length of said hub so as to be in direct heat transfer relation there-With, a generally cylindrical projection e..- tending from the back of said second portion coaxial with said hub, an electric drive motor stator supported in said projection, a rotor in the stator connected to said shaft, said second portion having a central aperture therein on the end remote from the hub coaxial with the hub, and an inlet plate mounted in said aperture closing the said aperture and including an integral diffuser portion engaging the outer end of said first portion and confining therewith a space for the impeller of the pump.

8. A casing for a centrifugal pump, said'casing comprising a unitary casting having a central cylindrical hub portion, bearings in said hub portion at one end and a seal in said pump portion at the other end, a pump drive shaft in the hub portion supported by said bearings and sealed therein by said seal, a pump impeller on said shaft, said casing comprising a first portion extending outwardr from the said other end of the hub for enclosing the back of the pump impeller, said casing comprising a second portion extending from the hub adjacent the said one end thereof, said second portion extending generally radially outwardly and then toward the said other end of the hub so as to be in surrounding relation with the said first porti n whereby to define a space for receiving liquid pumped by the pump impeller and which liquid surrounds a substantial portion of the length of said hub so as to be in direct heat transfer relation therewith, a generally cylindrical projection ex tending from the back of said second portion coaxial with said hub, an electric drive motor stator supported in said projection, a motor rotor on the shaft and in the stator, said second portion having a central aperture therein on the end remote from the hub coaxial with the hub, and an inlet plate mounted in said aperture closing the said aperture and including an integral diffuser portion engaging the outer end of said first portion and confining therewith a space for the impeller of the pum said inlet plate having an inlet passage therethrough coaxial with said hub communicating with the inlet of an impeller in the pump, and also having a passage for supplying the jet of a jet pump, said last mentioned passage leading through said inlet plate of the said second portion of said casing into the bottom of the space 1 etwecn said first and second portions.

9. in a centri ugal pump; an electric drive motor, a main body part having first means at one end to support said electric drive motor and second means at the other end defining a pumping chamber, an impeller in said pumping chamber, a drive shaft connecting the motor with the impeller, first wail means in said main body part comprising a hub rotatably receiving and supporting said shaft, a second wall in said main body part between said irst Wall and said pumping chamber through which said shaft passes, and seal means carried by said second mentioned Wall and surrounding said shaft, said motor comprising air circulating fan means, and passage means extending through said motor md between said Walls for the circulation of air through said motor.

References Cited in the file of this patent UNITED STATES PATENTS Shallenberg Nov. 2, 1948 Peters Aug. 9, 1949 Conery Oct. 10, 1950 Troeger et a1. Jan. 19, 1954 FOREIGN PATENTS France Apr. 23, 1959

Claims

1. IN A CENTRIFUGAL PUMP, A MAIN BODY PART HAVING A HUB, AN IMPELLER SHAFT JOURNALED IN SAID HUB, AN IMPELLER ON SAID SHAFT, AN INNER BODY PORTION EXTENDING FROM ONE SIDE OF THE HUB TO ENCLOSE THE BACK OF THE IMPELLER, AN OUTER BODY PORTION EXTENDING FROM THE HUB OUTWARDLY IN SPACED SURROUNDING RELATION TO SAID INNER BODY PORTION AND DEFINING WITH SAID INNER PORTION A CHAMBER FOR RECEIVING LIQUID PUMPED BY THE IMPELLER, AN INLET PLATE FIXED TO SAID OUTER BODY PORTION TO CLOSE SAID CHAMBER AND HAVING A PORTION ENGAGING SAID INNER BODY PORTION AND CONFINING THE PERIPHERY OF THE IMPELLER OF THE PUMP, DIFFUSER MEANS FORMED ON THE IMPELLER SIDE OF THE INLET PLATE ABOUT THE PERIPHERY OF THE IMPELLER FOR CONDUCTING FLUID FROM THE PERIPHERY OF THE IMPELLER TO SAID CHAMBER, A CYLINDRICAL PROJECTION INTEGRAL WITH SAID OUTER BODY PORTION AND ON THE SIDE OF SAID OUTER BODY PORTION OPPOSITE SAID INLET PLATE, AND AN ELECTRIC MOTOR STATOR IN SAID PROJECTION.