Pump for high g-load applications

Abstract

A pump for high G-load applications comprises a motor assembly coupled to an impeller mounted in a rigid housing and support structure. The motor assembly further comprises a rotor specifically designed to support large radial forces. The rotor is supported by two bearing assemblies. A stator that interacts with the rotor is supported by two rings that position it in the housing. The impeller acts upon a working fluid via an axial inlet and tangential outlet, which comprises a diffuser section to improve the overall pump efficiency. In an aspect, a first distance between the first bearing and the second bearing defines a bearing span, and the first bearing comprises a bearing bore, wherein a ratio of the bearing span to the bearing bore comprises less than 10:1.

1 . A pump for high G-load applications, comprising:
 a housing;   a stator mounted within the housing;   a rotor rotatably positioned within the stator and mounted to the housing by a first bearing and a second bearing, wherein a first distance between the first bearing and the second bearing defines a bearing span, wherein the first bearing comprises a bearing bore, wherein a ratio of the bearing span to the bearing bore comprises less than 10:1.   
     
     
         2 . The pump of  claim 1 , wherein the ratio comprises less than 9:1. 
     
     
         3 . The pump of  claim 1 , wherein the ratio is in a range between about 8:1 to about 4:1. 
     
     
         4 . The pump of  claim 1 , wherein the ratio comprises about 6:1. 
     
     
         5 . The pump of  claim 1 , wherein the bearing bore is proportional to a bearing size. 
     
     
         6 . The pump of  claim 1 , wherein the housing comprises a first end and a second end, further comprising a first end cap fluidly sealed to the first end, a second end cap fluidly sealed to the second end, and an insulation media positioned between the stator, the housing and the first end cap to define a fluid seal. 
     
     
         7 . The pump of  claim 1 , further comprising:
 wherein the housing comprises a first end;   a first end cap fluidly sealed to the first end, wherein the first end cap comprises an internal wall defining an opening through the first end cap;   a plurality of motor wires electrically connected to the stator and extending through the opening, wherein the plurality of motor wires are spaced apart from one another within the opening thereby defining gaps between the plurality of wires; and   an encapsulant within the opening and filling the gaps between the plurality of wires, fluidly sealing each of the plurality of wires and the opening.   
     
     
         8 . The pump of  claim 7 , further comprising:
 wherein the housing further comprises a second end opposite the first end further comprising a second end opposite the first end;   a first end cap fluidly sealed to the first end;   a second end cap fluidly sealed to the second end; and   an insulation media positioned between the stator, the housing and the first end cap to define a fluid seal.   
     
     
         9 . The pump of  claim 7 , further comprising an outer insulator containing a first length and a second length of the plurality of motor wires, wherein the first length and the second length are separated by a third length of the plurality of wires, wherein the third length is positioned within the opening. 
     
     
         10 . The pump of  claim 1 , further comprising:
 wherein the housing further comprises an axial inlet and a tangential outlet; and   an impeller connected to the rotor, wherein the impeller is operable to act upon a working fluid entering the pump via the axial inlet and pump the working fluid out of the tangential outlet.   
     
     
         11 . The pump of  claim 10 , wherein the outlet comprises a diffuser region having a variable-sized internal opening that increases in size as diffuser region extends from housing. 
     
     
         12 . The pump of  claim 10 , further comprising a holder mounted within housing and supporting the first bearing, wherein the holder and first bearing are axially positioned between the stator and the impeller. 
     
     
         13 . The pump of  claim 1 , further comprising:
 wherein the housing further comprises a first end and an opposing second end;   a first end cap fluidly sealed to the first end, wherein the first end cap comprises an internal wall defining an opening through the first end cap;   an insulation media positioned between the stator, the housing and the first end cap to define a fluid seal, wherein the insulation media comprises a first viscosity during installation;   a plurality of motor wires electrically connected to the stator and extending through the opening, wherein the plurality of motor wires are spaced apart from one another within the opening thereby defining gaps between the plurality of wires; and   an encapsulant within the opening and filling the gaps between the plurality of wires, fluidly sealing each of the plurality of wires and the opening, wherein the encapsulant comprises a second viscosity during installation, wherein the second viscosity is greater than the first viscosity.   
     
     
         14 . The pump of  claim 13 , wherein the first viscosity is less than about 2000 centipoise, and wherein the second viscosity is greater than about 2500 centipoise. 
     
     
         15 . The pump of  claim 13 , wherein the first viscosity is less than about 1500 centipoise, and wherein the second viscosity is greater than about 2500 centipoise. 
     
     
         16 . The pump of  claim 13 , wherein the first viscosity is in a range of about 700 centipoise to about 1300 centipoise. 
     
     
         17 . The pump of  claim 13 , wherein the first viscosity is about 1000 centipoise. 
     
     
         18 . The pump of  claim 13 , wherein the second viscosity is in a range of about 2500 centipoise to about 4500 centipoise. 
     
     
         19 . The pump of  claim 13 , wherein the second viscosity is in a range of about 3000 centipoise to about 4000 centipoise. 
     
     
         20 . The pump of  claim 13 , further comprising an outer insulator containing a first length and a second length of the plurality of motor wires, wherein the first length and the second length are separated by a third length of the plurality of wires, wherein the third length is positioned within the opening.