Patent ID: 7661658

Claim:
A submersible hollow shaft motor ( 1 ), comprising: a hollow shaft ( 2 ); a top oil chamber ( 5 ); a sand-throwing ring ( 6 ); a middle oil chamber ( 11 ); a bottom oil chamber ( 9 ); a top shaft extension ( 3 ); and a bottom shaft extension ( 4 ); wherein said sand-throwing ring ( 6 ) is disposed between said top shaft extension ( 3 ) and said top oil chamber ( 5 ); a keyway ( 7 ) is disposed at one end of said bottom shaft extension ( 4 ); a pair of mechanical seals ( 10 ) is disposed one in said top oil chamber ( 5 ) and one in said bottom oil chamber ( 9 ); a stator ( 12 ) and a rotor ( 13 ) are disposed in said middle oil chamber ( 11 ); and a cable ( 14 ) is connected to said middle oil chamber ( 11 ).