US2689529A

US2689529A - Submersible pump-motor

Info

Publication number: US2689529A
Application number: US285204A
Authority: US
Inventors: Lawrance W Wightman
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1952-04-30
Filing date: 1952-04-30
Publication date: 1954-09-21
Anticipated expiration: 1971-09-21

Description

P 21, 1954 L. w. WIGHTMAN SUBMERSIBLE PUMP-MOTOR Filed April 30, 1952 Inventor-z Lawrence W. Wightman, 1 fimw His Attornqy.

Patented Sept. 21, 1954 4 SUBMERSIBLE PUlVIP-MOTOR Lawrance W. Wightman, Fort Wayne, Ind., assignor to General Electric Company, a corporation of New York Application April 3 0, 1952, Serial No. 285,204

9 Claims.

This invention relates to motor driven pumps, and more specifically to submersible pump-motor units.

It is frequently desirable to position a pump at some level below the ground, as for example, in a well or a tank such as a gasoline storage tank. In such installations, to obviate the necessity for a long shaft extending from the pump to a motor at or near the ground level, it is desirable that the driving motor be closely associated with the pump in a compact unit, so that only the motor energizing line needbe carried to the ground level. such arrangements are commonly referred to as pump-motors. In this type of unit, where the motor is located with the pump below the level of the fluid, it is obvious that the pumped fluid must either pass through or around the motor in order to reach the casing which carries it to the ground level. When a device of this type is utilized to pump gasoline, for example, to supply a number of gasoline dispensers on the ground level from a common storage tank, it is obviously not desirable that the gasoline be pumped through the motor and. it is therefore necessary to seal the motor from the pump and to provide means for passing the gasoline over and around the motor. In .connection with the design of the pump itself, it is well known that the multistage radial or centrifugal flow pump is highly efficient, and it is therefore desirable to adapt such a pump for use in connection with a submersible pump-motor. It is additionally desirable to provide an arrangement wherein the pump unit may be disassembled from the motor without disassembling the motor itself.

It is therefore an object of this invention to provide a submersible pump-motor unit incorporating the desirable features enumerated above.

Further objects and advantages of this invention will become apparent and the invention will be better understood by reference to the following description and the accompanying drawing, and the features of novelty which characterize this invention will be pointed out in the claims annexed to and forming a part of this specification.

In accordance with this invention, there is provided a shaft having one or more impellers mounted thereon and a casing surrounding the impeller or impellers, openings being provided at each end for respectively admitting fluid to the pump and discharging the same therefrom. This casing may be longitudinally divided into a plurality of identical segments, thus requiring only one die for manufacturing and permitting assembly and checking of the impellers on the shaft prior to assembly of the casing. A motor is provided having its rotor mounted on the same shaft with the impeller or impellers, and having a frame assembly including a stator member mounted within an inner shell. The pumpcasing is attached to the frame assembly, and an outer shell surrounds the inner shell, being spaced therefrom defining a passage over the motor. The outer shell is joined to the pump casing and the discharge opening of the casing communicates with the passage over the motor so that the fluid discharged by the pump is pumped through the pasage over the motor. More specifically, motor endshields are provided joined to the inner shell and having bearings for rotatably supporting the shaft. Clamping means are provided engaging the endshields to hold the motor in assembled relation, and other clamping means attach the casing to the endshields so that the casing may be disassembled without disassembling the motor.

In the drawing, Fig. 1 is a side elevational view, partly in section, illustrating the improved pumpmotor of this invention; Fig. 2 is an end View of the construction of Fig. 1 as viewed from the left thereof; and Fig. 3 is an end view of the motor portion'of the unit with the pump portion disassembled as viewed along the line 3--3 of Fig. 1.

Referring now to the drawing, the submersible pump-motor unit has a pump portion generally identified as i, and a motor portion generally identified as 2. Considering first the pump portion, a shaft 3 is provided having a plurality of impellers 4 mounted thereon. The impellers 4 include web sections 5 to which blades 6 are attached, and shrouds 62 join the blades on their sides remote from the web sections 5. A casing 1 is provided surrounding the impellers 5 and having fluid straightening vanes 8 mounted therein. Vanes 8 are attached to annular dividers 9 and are also provided With shrouds Ill. The impellers 4 and the casing blades 8 cooperate to draw fluid into the entrance opening H formed at one end of the casing l, and to discharge this fluid through the end opening [2 formed at the other end of the casing l. The impellers 4 are held in assembled relation on the shaft 3 by means'of a suitable nut [3. In order to permit assembly of the impellers 4 on the shaft 3, the casing I is preferably longitudinally divided into two identical sections [4 and I5, held in assembled relation in any suitable manner, as by screws 16. With the pump casing formed in two identical halves as shown, only one die is required for manufacturing and it is possible to assemble the impellers 4 and disc-shaped dividers 9 With straightener 8 on the shaft 3 and check them for proper spacing and alignment prior to assembling the two casing halves I4 thereon.

The motor unit 2 includes a rotor ll shown as being of the squirrel cage type and having end rings 18. The rotor I! is mounted on an extension I9 of the shaft 3 on which the impellers 4 are mounted. A stator core 29 in which suitable windings 20 are arranged surrounds the rotor l1 and is mounted within an inner annular supporting the extension |:9 of the shaft 3.

shell member 2|. The inner shell member 2| extends beyond the axial ends of the stator core 20 and the rotor I1 defining end cavities 22 and 23. An endshield 24 is provided closing the end cavity 22 at one end of the stator 28 and rotor I1, and rotatably supporting the extension |9 of the shaft 3 by means of a suitable bearing 25, for example, a carbon bearing. The inner shell 2| engages an annular flange 26 formed on the endshield 24 and a suitable seal 21 prevents entry of fluid into the interior of the machine. The endshield 24 is provided with four projections 28 extending from the peripheral edge thereof as will be hereinafter more fully described. Endshield 24 also is provided with a plurality of radially spaced-apart projecting fins 29 having grooves 30 formed therein. An annular flange 3| formed at the discharge end |2 of the pump casing 1 mates with the groove 30 in the ends 29 as shown in. Fig. 1.

Another endshield member 32 is provided at the other end of the motor and has a similar graphite bearing 33 formed therein for rotatably Endshield 32 closes the end cavity 23 and the inner shell 2| is joined thereto by means of annular flange 34 with seal 35 preventing entrance of fluid into the interior of the motor. Line 36 for energizing the motor extends through a suitable opening 31 in the endshield 32. The endshield 32: is also provided with a plurality of projections 38 extending therefrom.

An outer endshield 39 is provided joined toendshield 32 by means of annular flange 48 formed thereon, with seal 4| being provided. The outer endshield 39 also has a plurality of projections 42 extending therefrom, and arranged in axial alignment with the projections 38 on the endshield 32. The outer endshield 39 has a plurality of radially spaced ribs 43 formed thereon, as will be hereinafter described, and an extension portion 44 having an internally threaded opening 45 formed. therein. The line 36 extends into the opening 45 with a suitable seal 46 sealing the cavity 41 formed by the endshield 39. It will be readily apparent that a suitable conduit may be threaded into the opening 45 to carry theline 38 to the surface.

In order to hold the motor in assembled relation, clamping bolts 41 engage alternate ones of the projections 28 on the end flanges 24 and the projections 38 and 42 on the endshields 32 and 39. It will be seen that the slotted heads 48 of the clamp bolts 41 are arranged facing the pump unit I, while the threaded ends 63 are threaded into suitable tapped openings in the projections 38 and 42. An outer end flange 49 is provided having an annular portion 59 abutting .the vanes 43 of the outer endshield 39. The outer end flange 49 is provided with a threaded opening into which a casing 52 may be threaded to discharge fluid from the unit. The pump casing 1 and the outer end flange 49 are held in assembled relation by the clamp bolts 53 extending through alternate ones of the projections .28 on the endshield 24 and the projections 38 and 42 on the endshields 32 and 39. These clamp bolts 53 pass through suitable openings in annular portion 58 of outer end flange 49, and threadingly engage annular flange 3| of casing I. It will be seen that the threaded heads 54 are arranged on the exterior of the machine.

It will now be readily seen that the clamp. bolts 41 hold the motor including endshields 24, 32, 39 and the inner shell 2| in assembled relation,

4 while the clamp bolts 53 connect the pump casing and the outer end flange 49 to the motor holding the pump casing T in abutting relationship with the fins 29 of the endshield 24 and the outer end flange 49 in abutting relationship with the fins 43 of the outer endshield 39.

To complete the assembly, an outer shell 55 is mounted on the

endshield projections

28, 36, and 42 surrounding the inner shell 2| and defining a passage 56 over the motor. It will be seen that the annular portion of the endshield 24 is spaced from the opening |2 of the casing 1 so that the opening |2 communicates with the passage 56 over the motor between the vanes 29. It will also be seen that the endshields 32 and 39 are spaced from the outer end flange 49 so that the opening 5| in the outer end flange 49 and therefore the interior 51 of the casing 52 communicate with the passage 56 between vanes 43. It will thus be seen that fluid discharged by the pump through casing discharge opening I2 enters the annular passage 56 surrounding the motor and passes thereover and is discharged into the easing '52. Outer shell 55 joins the casingv 1 and outer end flange 49 by means of rabbet connections 58 and 59, and seals 69 prevent loss of fluid through the joints between the outer shell 55 and the pump casing 1 and outer end flange 49. A suitable sealing arrangement 6| is arranged between the impellers 4 and the end flange 24 to prevent entry of fluid into the motor.

It will now be readily seen that this invention provides a construction wherein the pump portion is readily disassembled from the motor without requiring disassembly of the motor and is further characterized by the ease of manufacture and assembly and disassembly of the pump casing. It will also be readily seen that the pump unit is attached to. the stationary structure of the motor with the outer floating shell sealing the unit, to complete the assembly.

While I have shown and described a particular embodiment of this invention, further modification and improvements will occur to those skilled in the art. I desire it to be understood, therefore, that this invention is not limited to the form shown, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of this invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

.1. A submersible pump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and having openings formed therein for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamp ing means engaging said sections for remov ably holding said sections in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft and having a frame assembly, and means for attaching said casing to said frame assembly comprising an end shield rigidly attached to said frame assembly and having a plurality of projections each having an aperture formed therein, a flange formed on said casing and having a plurality of apertures formed therein, and a plurality of clamping members respectively extending between each of said end shield apertures and said casing flange apertures and into the same thereby to rigidly interconnect said end shield and said casing.

2. A submersible pump-motor unit compris- '5 ing ashaft, an impeller mounted on said shaft, a casingsurrounding said impeller and having openings formed therein for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamping means engaging said sections for removably holding said sections in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft, a frame assembly for said motor including a stator member surrounding said rotor member'and mounted in an inner shell, means for attaching said casing to said frame assembly comprising an end shield rigidly attached to said frame assembly and having a plurality of projections each having an aperture formed therein, a flange formed on said casing and having a plurality of apertures formed therein, and a plurality of clamping members respectively extending between said end shield apertures and said casing flange apertures and into the same thereby rigidly to interconnect said end shield and said casing, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said casing communicating with said passage whereby said fluid is pumped therethrough over said motor.

3. A submersible pump-motor unit comprising a shaft, an impeller mounted ,on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamping means engaging said section for removably holding said sections in'assembled relation whereby said cas- Iing a plurality of radially spaced apertures formed therein, and a plurality of clamping members parallel to said shaft and respectively extending between said end shield apertures and said casing flange apertures and into the same thereby rigidly to interconnect said end shield and said casing, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said outer shell being joined to said casing, said discharge opening of said casing communicating with said passage whereby said fluid is pumped therethrough over said motor.

4. A submersible pump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plural ity of identical sections, clamping means engaging said sections for removably holding said sections .in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft, a frame assemblyfor said motor including a stator member surrounding said rotor member and mounted in an inner shell defining cavities at the ends of said stator member, a pair of end shield members respectively joined to said inner shell and closing said cavities, said end shield members respectively having bearings for rotatably supporting said shaft, means for attaching said casing to at least one of said end shield members and comprising a plurality of radially spaced projections formed onsaid end shield member each having an aperture formed therein, a flange formed on said casing and having a plurality of radially spaced apertures formed therein, and a plurality of clamping members parallel to said shaft and respectively extending between said end shield apertures and said casing apertures and into the same thereby rigidly to interconnect said end shield and said casing, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said outer shell being joined to said casing, said discharge opening of said casig communicating with said passage whereby said fluid is pumped therethrough over said motor.

5. A submersiblepump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamping means engaging said sections for removably holding said sections in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft, a frame assembly for said motor including a stator member surrounding said rotor member and mounted in an inner shell defining cavities at the ends of said stator member, a pair of end shield members respectively joined to said inner shell and closing said cavities, said end shield members respectively having bearings for rotatably supporting said shaft, clamping means engaging said endshield member for holding said motor in assembled relation, means for attaching said casing to the end shield member adjacent thereto comprising a plurality of radially spaced peripheral projections on said end shield member each having an aperture formed therein, a flange formed on said casing and having a plurality of radially spaced apertures formed therein, and a plurality of clamping members parallel to said shaft and respectively extending between said end shield apertures and said casing apertures and into the same thereby rigidly to interconnect said end shield and said casing, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said outer shell being joined to said casing, said lastna-Ined end shield being spaced from said casing defining a cavity communicating with said casing discharge opening and said passage whereby said fluid is pumped therethrough over said motor.

6. A submersible pump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamping means engaging said sections for removably holding said sections in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft. a frame assembly for said motor including a stator member surrounding said rotor member and mounted in an inner shell defining cavities at the ends of said stator member, a pair of aeeasae shield members respectively having bearings for rotatably supporting. said shaft, clamping means engaging said end shield membersfor holding. said motor in assembled relation, a third and outer end shield member abutting in part that one of said pair of end shield members which is remote from said impellers, an outer end flange member abutting said outer end shield member and having. an opening therethrough for discharging fluid from said unit, said casing abutting the end shield member adjacent thereto, clamping means engaging said casing and said outer end flange for holding said unit in assembled relation whereby said casing and end flange member may be disassembled without disassembling said motor, and an outer shell surrounding said inner shell and spaced. therefrom defining a passage over said motor, said outer shell being joined to said casing and said outer end flange, said casing discharge opening and said outer end flange opening respectively communicating with said passage whereby fluid is pumped therethrough over said motor and outof said outer end flange opening.

7. A submersible pump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, said casing being longitudinally divided into a plurality of identical sections, clamping means engaging saidseotions for removably holding said sections in assembled relation whereby said casing is assembled around said impeller, a motor having a rotor member mounted on said shaft, a frame assembly for said motor including a stator member surrounding said rotor member and mounted in an. inner shell defining cavities at the ends of said stator member, a pair of end shield members respectively joined to said inner shell and closing said cavities, said end shield members respectively having bearings for rotatably supporting said shaft, each of said end shield members having a plurality of projections formed on the peripheral edge thereof, longitudinally disposed clamping means arranged over said inner shell and respectively engaging said projections on said end shield members for holding said motor in assembled relation, a third and outer end shield member abutting in part that one of said pair of end shield members which is remote fromsaid impellers, an outer end flange member abutting said outer end shield member and having a longitudinal opening therethrough for discharging fluid from said unit, said casing abutting the end shield member adjacent thereto, longitudinally disposed clamping means arranged over said inner shell and respectively engaging said casing and said outer end flange for holding said unit in assembled relation whereby said casing and. end flange member may be disassembled without disassembling said motor, and an outer shell surrounding said inner shell and mounted on said end shield member projections defining with said inner shell a passage over said motor, said outer shell being joined to said casing and said outer end flange, said casing discharge opening and said outer end flange opening respectively communicating with said passage whereby fluid is pumped therethrough over said motor and out of said outer end flange opening.

8. A submersible pump-motor unit comprising a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and having openlngs formed therein for respectively admitting fluid to said pump and discharging the same therefrom, a, motor having a rotor member mounted on said shaft, a frame assembly for said motor including a stator member surro said rotor member and mounted in an inner shdl, means for attaching said casing to said frame assembly comprising an end shield rigidly attached to said frame assembly and having a plurality of projections each having an aperture formed therein, a flange formed on said casing and having a plurality of apertures. formed; therein, and a plurality of members: respectively er tending between end shield apertures and said casing flange apertures and into: the same thereby rigidly to interconnect said end shield and said casing, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said casing communicating with said passage whereby said fluid is pumped therethrough over said motor.

9. A submersible pump-motor imit comprbing a shaft, an impeller mounted on said shaft, a casing surrounding said impeller and being open at both ends for respectively admitting fluid to said pump and discharging the same therefrom, a motor having a rotor member mounted on said shaft, a frame assembly for said motor including a stator member surrounding, saidrotor. member and mounted in an inner shell defining cavities at the ends of said stator member, a pair of end shield members respectively joined to said inner shell and closing said cavities, said end shield members respectively having bearings for rotatably supporting said shaft, clamping means emgaging said end shield members for holding said motor in assembled relation, a third and outer end shield member abutting in part that one of said pair of end shield members which is remote from said impellers, an outer end flange. member abutting said outer end shield member and having an opening therethrough for discharging fluid from said unit, said casing abutting the end shield member adjacent thereto, clamping means engaging said casing and said outer end flange for holding said unit in assembled relation whereby said casing and end flange member a may be disassembled without disassembling said motor, and an outer shell surrounding said inner shell and spaced therefrom defining a passage over said motor, said outer shell being joined to said casing and said outer end flange, said cesing discharge opening and said outer end flange opening respectively communicating with said passage whereby fluid is pumped therethmugh over said motor and out of, said outer end flame opening.

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