Integral motor centrifugal pump

Abstract

A new integral motor/pump design utilizing a combination centrifugal enclosed impeller, shaft and feeder conduit. Whereby the impeller drive shaft serves a dual purpose of providing applied power from the hollow motor driveshaft directly to the impeller blade or blades and also is a fluid entrance conduit for the impeller media feed. The present invention hollow motor drive shaft, hollow impeller shaft and enclosed impeller also incorporates optional changeable impeller leading edge blades. These blades help facilitate the most efficient flow of various fluids and pumped media. The present invention utilizes simplicity of design whereby inspection and service accessibility is optimized. Design configuration renders radial thrust bearing curves more applicable to a broad range of applications and extended motor/pump service life.

What I claim is:  
     
       1. A motor driven centrifugal pump comprising: 
       (a) an oil cooled motor comprising  a hollow motor shaft, a motor enclosure, a top motor end plate and a bottom motor end plate  and two motor endplates;  
       (b) a hollow impeller shaft concentric within and coupled to said hollow motor shaft;  
       (c) said hollow impeller shaft having a top end which extends  extending beyond said motor enclosure, past said top motor end plate  one of the motor end plates;  
       (d) top  lubricated axial bearings located in said top motor end plate  each of the motor end plates and supporting said hollow motor shaft;  
       (e) bottom axial bearings located in said bottom motor end plate supporting said hollow motor shaft; 
       (f  e) a cylindrical volute casing enclosing the impeller said casing mounted on top of said motor end plate  volute casing enclosing an impeller connected to the impeller shaft, said impeller having a top;  
       (g  f) a removable impeller inspection end plate attached to the top of said impeller;  
       (h) said axial bearings being oil lubricated; 
       (i  g) oil lubricated mechanical sealing means located on the interface of the hollow motor shaft and the motor end plates for sealing said motor; and  
       (j  h) a removable volute inspection plate attached to the top of the volute casing.  
     
     
       2. A motor driven centrifugal pump as described in claim  1  and further comprising: 
       (a) two oil circulating impellers mounted on the hollow motor shaft.  
     
     
       3. A centrifugal pump comprising: 
       
         a stator;  
       
       
         a hollow rotating shaft through which a pumpate flows, the shaft operating an impeller which pumps the pumpate, said impeller having a top;  
       
       
         a removable impeller inspection plate attached to the top of the impeller;  
       
       
         at least two bearings which support the rotating shaft relative to the stator; and  
       
       
         at least two mechanical seals sealing the rotating shaft such that the pumpate is substantially kept from contacting the at least two bearings.  
       
     
     
       4. The centrifugal pump of claim  3  further comprising a volute disposed about the impeller, and a volute inspection plate attached to the volute.  
     
     
       5. The centrifugal pump of claim  3  further comprising a rotor concentric with the rotating shaft.  
     
     
       6. A centrifugal pump comprising: 
       
         a shaft defining an internal channel through which a fluid can flow, the shaft operating an impeller which pumps the pumpate, said impeller having a top;  
       
       
         a removable impeller inspection plate attached to the top of the impeller;  
       
       
         a motor having a stator and a rotor, the rotor concentric with and coupled to the shaft;  
       
       
         first and second bearings positioned about the shaft on opposite sides of the rotor; and  
       
       
         first and second seals positioned about the shaft to form a substantially fluid tight barrier between the fluid and the bearings.  
       
     
     
       7. The centrifugal pump of claim  6  further comprising a volute disposed about the impeller, and a volute inspection plate attached to the volute.