Centrifugal electric pump for suction of aeriform fluids

Abstract

A centrifugal electric pump ( 1 ) for suction of aeriform fluids includes: an electric motor ( 2 ) provided with a rotating shaft ( 3 ); a suction body ( 4 ) provided with an intake ( 5 ) for the aeriform fluid and with at least one exhaust port ( 6 ); at least one fan ( 8 ), fitted onto the shaft ( 3 ) and driven in movement by the motor ( 2 ), adapted to draw in a flow of air from the intake ( 5 ), spin it and discharge it outside the suction body ( 4 ) through the at least one exhaust port ( 6 ), wherein the electric motor ( 2 ) includes: a rotor with windings ( 9 ); a stator ( 10 ) adapted to create a magnetic field inside which the rotor ( 9 ) rotates, and wherein the stator ( 10 ) is of the type with permanent magnets and the rotor ( 9 ) rotates at a high number of revolutions.

1 . A centrifugal electric pump ( 1 ) for suction of aeriform fluids comprising:
 an electric motor ( 2 ) of by-pass type provided with a rotating shaft ( 3 );   a suction body ( 4 ) provided with an intake ( 5 ) for the aeriform fluid and with at least one exhaust port ( 6 ) belonging to the same suction body ( 4 );   at least one fan ( 8 ), fitted onto said shaft ( 3 ) and driven in movement by said motor ( 2 ), adapted to draw in a flow of air from said intake ( 5 ), spin it and discharge it outside said suction body ( 4 ) through said at least one exhaust port ( 6 ),   
       wherein said electric motor ( 2 ) comprises:
 a rotor with windings ( 9 ); 
 a stator ( 10 ) adapted to create a magnetic field inside which said rotor ( 9 ) rotates, 
 
       characterized in that said stator ( 10 ) is of the type with permanent magnets and said rotor ( 9 ) rotates at a high number of revolutions. 
     
     
         2 ) The centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said rotor (9) rotates at a number of revolutions higher than 7,000-8,000 rpm. 
     
     
         3 ) The centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said stator ( 10 ) comprises a hollow cylindrical body ( 11 ) made of iron, provided on the inside with two permanent magnets ( 12   a,    12   b ) with opposite polarity, adapted to generate a magnetic field inside said hollow cylindrical body ( 11 ). 
     
     
         4 ) The centrifugal electric pump ( 1 ) according to  claim 3 , characterized in that said permanent magnets ( 12   a,    12   b ) are substantially semi-cylindrical in shape. 
     
     
         5 ) The centrifugal electric pump ( 1 ) according to  claim 4 , characterized in that said stator ( 10 ) comprises leaf springs ( 13 ), provided inside said hollow cylindrical body ( 11 ), adapted to block said permanent magnets ( 12   a,    12   b ) in position. 
     
     
         6 ) The centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said rotor ( 9 ) with windings comprises a plurality of coils ( 14 ) connectable to one another in parallel or in series. 
     
     
         7 ) The centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said stator ( 10 ) comprises a third permanent magnet ( 15 ), arranged outside said hollow cylindrical body ( 11 ), whose magnetic field is adapted to interact with the magnetic field generated by two internal magnets ( 12   a,    12   b ), so as to vary the number of revolutions of said rotor ( 9 ). 
     
     
         8 ) The centrifugal electric pump ( 1 ) according to  claim 7 , characterized in that the position taken by said third magnet ( 15 ) on the outer surface of said hollow cylindrical body ( 11 ), with respect to the arrangement of the two internal magnets ( 12   a,    12   b ), is adapted to modify the magnetic field generated by the stator ( 10 ) and therefore its interaction with the magnetic field generated by the rotor ( 9 ), determining a higher or lower rotation speed. 
     
     
         9 ) The centrifugal electric pump ( 1 ) according to  claim 8 , characterized in that said electric motor ( 2 ) comprises means for adjusting the position of said third magnet ( 15 ) around the outer surface of said hollow cylindrical body ( 11 ). 
     
     
         10 ) The centrifugal electric pump ( 1 ) according to  claim 9 , characterized in that said adjustment means are accessible from the outside of said motor ( 2 ).