US2138032A - Semisubmersible motor pump - Google Patents

Description

Nov. 29, 1938. -A. HOLLANDER SEMISUBMERSIBLE MOTOR PUMP Filed April 5, 1957 5 a .e c at 25% a a H mm a CI N M F M m fi E 7. i? d r II III 1| a ii: my M i J 4 5 2 win 2 M w w m 0 9 3 4 a, www a a ATTORNEY UNITED STA-TE Patented Nov. 29', 1938 SEMISUBMERSIBLE Moron PUMP Aladar Hollander, Berkeley, Calif., assignor to Byron Jackson 00., Huntington Park,ralif., a, corporation of Delaware Application April 5, 1937 Serial No. 135,059

' Claims. "(Cl 103-87) This invention relatesto motor driven pumps for raising liquid fromwells, and' more particularly to that form of pumping unit in which the motor and pump are both placed in the well at or near the fluid level. The pumps employed for this purpose are usually (but not necessarily) centrifugal pumps. Electric motors are used toa drive the pumps.

well casing.

Motor-pump units as heretofore used in the foregoing manner have been of three general 7 types:

That type in which the motor is at the-top of the well and is connected by means of a long shaft to the pump below the fluid level. The objection to this type of construction is the cost of the long drive shaft and the amount of power required to drive it.

(2) That type in which both the motor and pump are submerged below the draw-down fluid level in the well. With this type of construction it is .very dilicult and expensive to provide a" motor construction which will positively prevent the entrance of well fluidinto the interior of the motor.

(3) That typein which the pump is below the fluid level in the well while the motor is above the fluid level and is suspended from the dis-' charge column, ,a cable or a packer set in the With this type of construction it has been necessary to raise or lower the pumping unit from time to time as the fluid level varies in the well. Moreover, it has been the custom to conduct the fluid from the pump through a discharge pipe past the motor and thence to the discharge column. Because of the small diameter of .most wells it is impossible to use a mdtor of reasonably large diameter when room must beleft between the motor and well casing for the .discharge pipe. Motors of small diameter must be made very long in order to;

develop the required power, thus entailing special expensive manufacturing facilities. Moreover,

1 small diameter motors are not as readily cooled by air as are larger diameter motors.

It is an object of present invention to provide a motor pump unit which can .be placed at or near'the fluid level i'n'a well in order to elimimate the long drive shaft between the motor and pump.

Another object is to provide a construction whereby the motor is at all times above the fluid level in the well.

Another object is to provide a motor-pump unitin which the motor; although above the pump, is of relatively large diameter as comwell.

pared to the diameter of the casing in which it is placed. Another object is to provide a construction wherein the motor is cooled by the pumped fluid but without the necessity of using special means 5 for excluding well fluid from the motor as is necessary with true submersible motor-pumps. Another object is to utilize the pump discharge, column to suspend the motor-pumpunitin the well.

The foregoing and other advantages will be apparent from the following description and drawing.

Figure l-is an elevation, partly-in cross section, of the upper half of a LmOtOr-pump embodying 5 the invention as installedin a deep well.

Figure 2 is an elevation, partly in cross section, of'the lower half of the motor-pump shown in Fig. I g

The numeral l indicates the casing of a well. 20

The standing fluid level in the well is indicated at 3 and the pumping fluid level at d. I The dif- 7 ference between these two levels is commonly called the draw-down. 7

A typical deep well centrifugal pump is indi- 5 cated at 6 positioned below the lowest fluid level in the well. The pump suction is indicated at,'l. The electric motor which drives the pump is enclosed in a fluid tight housing indicated at ll positioned above the highest fluid level in.the' 30 The motor is connected to the pump 5 by means ofa shaft M. This shaft is of a length somewhat greater than the normal draw-down of the well (which is as a rule much less than 35 v the distanceto the top of the well). Above and secured to the discharge end of the. pump 5 is a flanged top case M bolted to the pump casing at one end and bolted to an adapter case H3 at its other end. The top case M is pro- 40 vided with a stufing box it and a plain bearing i5. Threadedly connected to the upper end of the adapter case it is a short section of pipe column it the upperend of which is threadedly connected to an adapter case il. Supported upon the upper end of the case H is a by-passmonduit at having a substantially semi-annular fluid passage it off-set laterally from: the vertical axis of the shaft ii. The lower end of conduit it is provided with an opening 20 through which the motor shaft passes. The upper end of the by-pass conduit it is provided with a laterally I! and the upper end of the bearing I5. This .tube is adapted to be filled with lubricant for the pump bearing l5 from a pipe 24 which may ex- ;tend to the surface of the well. The tube 23 ex- 5 tends through the opening 20 and is threadedly supported from a nut 230 which rests on 'the by-pass conduit l8. A cover 231) rests upon the top of the nut 23a and is provided with a threaded opening 230 adapted to receive the oil pipe 24.

Supported on and extending upwardly from the.

flange 2| is a cylindfi'calcasing 25 which surrounds the motor casing 9 and provides an annular fluid passage 26 between the two casings.

The upper end of casing 25 is provided with a V cover 21 provided with two openings, 28 and 29. An extension 33 on the top of the motor casing 9 extends through the opening 28 and is secured in fluid tight relation thereto by means of a suitable packing 30, a follower ring 3| and a sleeve 32 threadedly eng'agingthe upper end of extension member 33. The motor leads 34 pass through the extension member. 33 and out through a stuffing box 35, and thence to the top of the well. The cover 21 is providedwith a by-pass conduit 36 having a semi-annular fluid passage 3I. The upper end of the by-pass conduit 36 is provided with a laterally extending flange 38. d An adapter casing 39 is supported on the flange 38 and is threadedly connected to the lower end of the discharge casing 40. I r

From the foregoing description it will be'seen [that the fluid discharged upwardly from the pump 6 passes through the pipe IS, the by-pass I8, the-annular channel 26- between the casings 9 and 25,, the by-pass 36 and thenceupward through the discharge column 40 to the top of the well. The fluid serves to cool the motor housing'9 thereby increasing the efliciency of the motorand making practical the use ofTelatively small diameter motors, and at the same time perputting the use of motors of relatively large diameter as compared to the diameter of -the well casing. I There is 'no danger of well fluid getting into the motor housing .9 because the motor housing is placed well above the maximum standing fluid 'level 3 and because both ends of the motor are sealed from the well fluid but are open to the air space in the well. Consequently it is not neces-,

ble type, that is, a motor having means for preventing the entrance of well'fluid into the motor. The present construction therefore becomes eco nomical since it permits the use of air-filled motors of the conventional type. 5 Inasmuch as the pump 6 is placed wellbelow the lowest pumping water level and the shaft ll is longer than the normal draw-down, there is no need to change the pump setting during normal conditions, and yet the shaft l I is relatively short conventional pump which extends from below I the lowest fluid leyel to the top of the well.

- The pump .and motor are supported in the well by being suspended from the; discharging column. I claim:

' i 1; In a deep well pumpjorwells having a substantial-draw-down, adischarge-column extending' from the top of the well to a point adjacent but above the maximum normal fluid level'in the well, a casing suspended from said discharge column and in op'en'communication therewith, a 'housing containing an electric motonmounted in'said casing in spaced relation to the walls thereof and in fluid tight relationthereto and adapted to be cooled by the fluid passing-through with the air space in the well, a second fluid con- "pipe and positioned with its suction inlet below the lowest normal fluid level in the well, and a .ing from the top of the well to point adjacent sary to use a motor of the so-called-submersiand inexpensive as compared to the shaft of the e Vertical axis thereof, 'Second discharge and a drive shaft motor.

said casing, said housing being located in flxed position above said maximum normal fluid level and the interior thereof being in communication with the air space in the well, a seconddischarge column suspended from said casing and in open 5 communication therewith, said second column g being of a length reater than the draw-down of the well, a rot ry pump supported from said second discharge column and having its suction inlet positioned below the lowest normal fluid level .in the well, and a shaft connecting said pump and said motor.

2. In a deep well pump for wells having a substantial draw-down, adischarge column extending from the top of the well to a point adjacent but above the maximum normal fluid level-in the well, a casing suspended from said discharge column, a fluid conduit communicating the upper end of said casing with the lower end of said discharge column, said conduit being ofiset lat- I erally from the vertical axis of saidcasing, a

housing containing an electric motor mounted in said casing in spaced relation to the walls thereof and in fluid tight relation thereto and adapted to be cooled by the: fluid passing through said casing, the ends of said housing extending through the'ends-of said casing at the vertical axis thereof, said housing being located in fixed position above said maximum normal fluid level and the interior thereof being in communication duit secured to the lower end of said casing in an ofl'set relation to the vertical axis thereof,- an extension pipe secured to'the lower end of said second conduit'in line with the vertical axis of said motor said second fluid conduit and said extension pipe being of a combined lengthgreater than the draw-down of the well, a rotary pump secured to the lower end of said extension drive shaft pump.

' 3. In a deep well pump for wells having .a'substantial draw-down, a discharge column extendexten ding from said motor to said said motor housing being located in fixed position above the maximum normalfluid level in the well, a conduit communicating said casing with said discharge column and ofiset laterally from column suspended from said casing and in open communication therewith, said second column beingof a length greater than the draw-down of the well, a rotary pump suspended from said second. discharge column and having its disw charge outlet in open communication therewith,

saidpump being positioned with its suction inlet below the lowest normal fluid level in the well,

connecting said pump and 7 4. In a deep well pump defined in claim l,

' motor leads extending iro'm the upper endgof containing an electric motor mounted in said casing in spaced relation to the walls thereof and in fluid tight relation'thereto and adapted to'be cooled bythe fluid passing through said casing, the interior of said housing being in communication with the air space in the well and said housing being locatedin fixed position above said maximum normal-fluid level, a pipe com municating'at its upper end with said casing and extending to a point below the lowest normal fluid level in the well, a rotary pump suspended from said pipe and adapted to discharge well fluid into the lower end thereof, a shaft extending through said ipe and operatively connecting said motor and pump, a bearing at the lower end of said shaft, a tube surrounding said shaft in spaced relation thereto and spaced from the walls of said pipe, and means for supplying lubri- 1 i cant to said tube.

' o ALADAR. HOLLANDER.

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