Abstract:
A pump-motor assembly having a base, a horizontal pump, a pump bracket to attach the pump to the base, a motor to energize the pump and a motor mount with a motor table and a motor platform to support and position the motor. The motor platform has a standard hole pattern for fasteners connecting the motor platform to the motor table. The motor table has a base and an adapter plate with multiple aperture sets standardizing the motor platform height and motor fastener pattern that establish the height of the motor shaft relative to the motor platform. The thickness of the base plate can be varied as necessary to determine a required motor shaft height, thereby accommodating motor sizes within a selected large range of motor sizes.

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to the field of pump-motor assemblies, and in particular but not by way of limitation, to motor mounts used in conjunction with horizontal pumps. 
     BACKGROUND OF INVENTION 
     Motors are widely used in industrial applications and a large cost of motor change-outs is in the cost and time involved with changing out or modifying the motor mount every time a motor size changes. This is especially true with existing horizontal pumping systems. These systems have flow rates and discharge pressure demands that can vary greatly over short periods of time requiring a change-out of the pump. This causes the horsepower requirements to vary necessitating a change out of the motor. A typical horizontal pump-motor change usually means a change in motor frame and thrust chamber, pump intake bracket. This occurs since a change in the motor frame changes the shaft height and the thrust chamber/pump intake bracket must change to match the new shaft height. 
     The most common of the pump-motor assembly changes involves a change in shaft height and motor base. In the past manufactures have handled these changes by replacing the existing pump frame with a new one with a different motor platform height and bolt pattern. Each motor would require a different frame and each frame would require different drawings and part numbers to accommodate the different motor sizes. For instance, horizontal pumps used for down-hole injection normally require ten different motor frames for a range of standard motors and eight different frame lengths. These requirements result in the manufacturer producing and maintaining more then eighty possible part numbers and associated drawings. This is time consuming and expensive for a manufacturer and supplier to deal with, from the up-front engineering design work to the associated large inventories. 
     There is a need for a semi-universal integrated motor mount that offers an economy of manufacture while affording maximum serviceability at the site of installation. 
     SUMMARY OF INVENTION 
     The present invention provides a pump-motor assembly having a base, a horizontal pump, a pump bracket to attach the pump to the base, a motor to energize the pump and a motor mount with a motor table and a motor platform to support and position the motor, the motor platform having a standard hole pattern for fasteners connecting the motor platform to the motor table. The motor table has a base and an adapter plate with multiple aperture sets standardizing the motor platform height and motor fastener pattern that establish the height of the motor shaft relative to the motor platform. The thickness of the base plate can be varied as necessary to determine a required motor shaft height, thereby accommodating motor sizes within a selected large range of motor sizes. 
     An object of the present invention is to provide an improved, adaptable pump-motor assembly having an adjustable mount that provides installation flexibility, field serviceability and economy of manufacture. 
     Other objects, advantages and features of the present invention will become clear from the following detailed description and drawings when read in conjunction with the claims. 
     BRIEF DESCRIPTION OF DRAWINGS 
     FIG. 1 a perspective view of a pump-motor assembly constructed in accordance with the present invention. 
     FIG. 2 is another perspective view of the motor assembly of FIG. 1 showing the motor platform and motor table. 
     FIG. 3 is a side cross-sectional view taken at  3 — 3  in FIG.  2 . 
     FIG. 4 is a partial cutaway view of the adjustment mechanism of FIG.  3 . 
     FIG. 5 is a front, cross-sectional view taken at  5 — 5  in FIG.  2 . 
     FIG. 6 is a top view of the motor table of the motor mount of FIG. 5 showing the apertures, adapter plate, and motor table base. 
     FIG. 7 is a top view of the motor platform of the motor mount of FIG.  5 . showing the apertures and jacking blocks. 
     FIG. 8 is a top view of the motor table of FIG.  6  and motor platform of FIG. 7, along with a motor outline, as such would group together. 
     FIG. 9 is a perspective view of one type of motor table base of the motor mount of FIG.  6 . 
    
    
     DESCRIPTION 
     Referring to the drawings in general and in particular to FIGS. 1 and 2, shown therein is a modular pump-motor assembly  10  constructed in accordance with the present invention. The pump-motor assembly  10  has a pump  12  and pump brackets  14  to attach the pump  12  to a base  16  which serves as a foundation for the pump-motor assembly  10 . The elongated horizontal pump  12  is an electric submersible pump of the type commercially available in the industry. 
     The pump  12  is known to be sensitive to movement and requires a sturdy base. The base  16 , also shown in FIG. 2, can be made of steel or any sturdy material, such as a metal or concrete composite, sufficient to support the weight of the pump-motor assembly  10  and maintain the stability thereof during operation without excessive movements due to external forces such as pump and motor vibrations. 
     A motor  18  is attached to the pump  12  through a thrust chamber intake assembly  19  as shown in FIG.  1 . The pump  12  is shown in more detail as part of a motor mount  20  in FIG. 2, the motor mount  20  having a motor platform  24  and a motor table  26 . The motor platform  24  and the motor table  26  cooperate to support the motor  18 . 
     FIG. 3 shows the motor platform  24  as being attached to the base  16  with several base fasteners  28 . An alternative to using base fasteners  28  is to permanently attach, as by welding, the motor platform  24  to the base  16 . Attached to the motor platform  24  and forming portions of the motor mount  20  are a number of jacking blocks  30 , two of which are disposed on opposing sides of the motor table  26 . Each jacking block  30  together with a threaded jack screw  32  associated therewith serve as an adjustment mechanism  34 . 
     FIG. 4 shows a side view of one of the adjustment mechanisms  34  (without the associated jack screw) attached to the motor platform  24 . The jacking block  30  has a threaded jack screw bore  36  that receives the associated jack screw  32  extending there through to abut the motor table  26 . The adjustment mechanisms  34  are spatially disposed to receive the motor table  26  therebetween, and the adjustment mechanisms  34  can be adjusted to secure the motor table  26  by turning the jack screws  32  to press against the motor table  26 . 
     Referring to FIG. 5, the motor platform  24  and the motor table  26  of the motor mount  20  are shown. The motor table  26  has a pair of motor table bases  38  permanently attached, as by welding, or alternatively attached with fasteners to an adaptor plate  40 . The adaptor plate  40  is disposed directly under the motor  18  which is attached to the motor platform  24  with motor fasteners  42 . 
     FIG. 5 shows two of the adjustment mechanisms  34 . These adjustment mechanisms  34  allow fine positional adjustment of the motor table  26  to be made in a direction normal to the direction of the adjustment mechanisms  34  shown in FIG.  3 . Thus, adjustments can be made in both the x and y directions, and the magnitude of the adjustments can be determined by varying an adjustment space  44  between the jacking blocks  30  and the motor table  26  as shown in FIGS. 3 and 5, and by establishing the length of the jack screws  32  as required. As noted, the jack screws  32  actually engage the motor table base  38  which is secured to the adapter plate  40 . Once necessary adjustments are made, the platform fasteners  46  shown in FIG. 5 can be tightened to maintain the desired position of the adapter plate  40 . 
     In addition to the adjustment mechanisms  34  on the motor platform  24 , the motor table  26  provides an adjustment of motor  18  in another dimension relative to the pump  12 . The thickness of the motor table bases  38  shown in FIG. 5 can be varied as required to achieve a desired height of the adaptor plate relative to the motor dimensions, and can be changed as necessary to adjust in the vertical or z direction. The adaptor plate  40  is provided with a plurality of predetermined sets of mounting apertures, as shown in FIG. 6, wherein the adapter plate  40  is shown. These aperture sets are established so that the motor  18  can be set relative to the x and y directions to accommodate a wide range of motor frames having a particular shaft height. FIG. 6 shows the motor table  26  as having a plurality of platform fastener apertures  48  and motor fastener apertures  50  that receive the platform fasteners  46  and motor fasteners  42  extending there through to connect the adaptor plate  40  to the motor platform as shown in FIG.  5 . 
     The motor table  26  of the present invention is designed such that the apertures  48 ,  50  are configured to accept the required range of standard motor fastener  42  aperture sets. This eliminates the cost of motor  18  change-outs due to the expense and time involved with changing out or modifying a motor mount  20  every time a different motor size is required. This is especially true with existing horizontal pumping systems because the horsepower demands can vary greatly, necessitating frequent changes of pump  12  and motor  18 . Since the most changes involve a change in the dimensions of the pump/motor combination, it is common for the shaft height and motor foot locations to change, and traditionally each motor change would require a change of the motor mount  20  to accommodate the new pump/motor combination. This problem has been addressed in the present invention by the addition of a variable height motor table base  38  and adapter plate  40  as shown in the motor mount  20  of FIG.  5 . 
     In the past manufactures have handled changes in pump or motor by varying the motor platform height  24  and the fastener pattern. Each motor required a different motor mount and sometimes a different base. Each motor mount would require different drawings and part numbers to accommodate the different motor sizes. For example, for those pump-motor assemblies commonly encountered in a large segment of the oil industry, horizontal pump-motor assemblies used to inject fluid down-hole commonly required about ten motor mounts with a required range of motors and at least eight different base lengths. This resulted in more than eighty possible part numbers and drawings. The motor table base  38  and adapter plate  40  reduce these parts and drawings to a relative few different adapter bases  38  and only a few adapter plates  40  with all anticipated patterns of the aperture  48 ,  50  provided in these few adapter plates  40 . 
     FIG. 7 shows the motor platform  24  having eight adjustment mechanisms  34 , each adjustment mechanism  34  made up of one of the before described jacking blocks  30  and jack screws  32 . These adjustment mechanisms  34  are attached to the motor platform  24  so that the motor table  26  is adjustable in two directions (x and y) for finely tuned adjustments. The elongated platform fastener apertures  52  and the elongated motor fastener apertures  54  allow the adjustment mechanisms  34  to be moved as discussed above. The motor platform  24  also has a circular aperture  56  in each corner of the motor platform  24  that receive the base fasteners  28 . FIG. 8 shows the adaptor plate  40  as positioned on the motor platform  24  and nested between the eight adjustment mechanisms  34 . 
     The adapter plate  40  of the present invention, with the variable height capability of the motor table base  38  and the plurality of predetermined sets of motor fastener apertures  50 , determines the motor shaft height relative to the motor platform  24 . The heights of the pump brackets  14  are also fixed. Thus, only the thickness of the motor table base plates  38  are varied to handle a wide range of motor sizes as required. 
     An alternative manner of changing the thickness of the base plates is shown in FIG. 9 where is shown the base plate  38 A. The base plate  38 A is made up of several plates  58  which are stacked and fastened together by welding, as shown, or with fasteners. The plates  58  are provided with axially aligned apertures  48 ,  50  and when stacked serve the same purpose as the above described base plate  38 . The thickness of the base plate  38 A can be varied at will by altering the number of plates  58  to accommodate all required motor-pump combinations as the resulting pump shaft height may require. 
     The present invention offers an economy of manufacture while affording maximum serviceability at the site of installation through the use of a standard adapter plate (such as  40 ) and a variable height adapter base (such as  38 ). The time consuming and expensive procedure for preparing up-front engineering design work and large inventories for a number of different parts is no longer necessary for the manufacturer or supplier to develop and maintain. 
     It will be clear that the present invention is well adapted to attain the ends and advantages mentioned as well as those inherent therein. While a presently preferred embodiment has been described for purposes of this disclosure, numerous changes may be made which will readily suggest themselves to one skilled in the art and which are encompassed in the spirit of the invention disclosed and as defined in the appended claims.