Sealed pump

Abstract

A liquid pump has an annular stator having wire windings that extend around a generally tubular central opening. An inner housing made of a non-ferrous material has an inner opening, an input end, and an output end such that liquid can enter the input end, pass through the inner opening and exit through the output end. A portion of the housing extends through the central opening of the stator and a brushless rotor mounted on a shaft is positioned entirely within the housing to thereby seal the shaft from leakage. A drive attached to the shaft urges the liquid from the input end of the housing to the output.

1 . A liquid pump comprising
 an annular stator having wire windings and a central opening,   a non-ferrous sealed housing having an inner opening that is accessible only through an input opening and an output opening,   a portion of said housing extending through said central opening of said stator,   a brushless rotor mounted on a shaft,   said brushless rotor and said shaft being entirely within said housing, and   a drive attached to said shaft wherein liquid from said input opening is urged by said drive toward said output opening.   
   
   
       2 . A pump comprising
 a sealed outer housing,   said sealed outer housing having a central opening accessible only through an input opening and an output opening,   a stator having a plurality of windings surrounding a central opening,   said central opening of said stator forming a portion of said central opening of said housing wherein liquid entering said central opening of said pump through said input opening will pass through said central opening of said stator to reach said output opening,   a rotor within said central opening of said stator, and   a drive connected to said rotor and within said central opening of said housing for urging said liquid or gas from said input opening to said output opening.   
   
   
       3 . The pump of claim  21  wherein
 said windings are configured as a plurality of lobes around a portion of said central opening of said housing, and   a spacing between two of said lobes wherein a portion of said liquid moving from said input opening passes between said spacing to reach said output opening.   
   
   
       4 . The pump of  claim 3  wherein said stator comprises at least four of said lobes and a spacing exists between adjacent pairs of said lobes wherein a portion of said liquid will pass between said adjacent pairs of lobes. 
   
   
       5 . The pump of  claim 2  and further comprising a sealing material applied to an outer surface of said windings to protect said windings from said liquid.