Screw compressor

Abstract

A screw compressor has an electric motor having a given longitudinal axis, and two intermeshing rotors; the electric motor having an output shaft also defining the output shaft of that of the two rotors which is coaxial to the longitudinal axis of the electric motor.

1 ) A screw compressor comprising an electric motor ( 2 ) having a given longitudinal axis ( 4 ); and two intermeshing rotors ( 9 ,  10 ), a first ( 9 ) of said rotors ( 9 ,  10 ) being substantially coaxial with said longitudinal axis ( 4 ); characterized by also comprising a single output shaft ( 6 ) defining the output shaft of both said electric motor ( 2 ) and said first rotor ( 9 ).  
     
     
         2 ) A compressor as claimed in  claim 1 , wherein said output shaft ( 6 ) is formed in one piece with said first rotor ( 9 ).  
     
     
         3 ) A compressor as claimed in  claim 1 , wherein said first rotor ( 9 ) is connected in angularly fixed manner to said output shaft ( 6 ).  
     
     
         4 ) A compressor as claimed in  claim 1 , wherein said output shaft ( 6 ) comprises a central portion ( 14 ) located between said electric motor ( 2 ) and said first rotor ( 9 ); a single bearing ( 7 ) supporting said output shaft ( 6 ) in rotary manner at said central portion ( 14 ).  
     
     
         5 ) A compressor as claimed in  claim 1 , wherein said electric motor ( 2 ) comprises a first tubular outer casing ( 3 ); the compressor also comprising a second tubular outer casing ( 8 ) housing said rotors ( 9 ,  10 ) and connected directly to said first tubular outer casing ( 3 ).