Centrifugal electric pump for suction of aeriform fluids with silencing device

Abstract

A centrifugal electric pump for suction of aeriform fluids includes an electric motor equipped with a shaft; a cylindrical suction box provided with an inlet for the aeriform fluid, one or more outlet openings arranged on the lateral wall thereof and with a closing cover; at least one fan driven in movement by the motor, arranged for sucking a flow of air from the inlet, centrifuge it and discharge it outside the suction box through the one or more outlet openings, a silencing device arranged inside the suction box. The silencing device includes an annular deflector, placed in front of the outlet openings, so as to interrupt the direct path of the flow of centrifuged air between the at least one fan and the outlet openings, and arranged for creating a shaped annular damping chamber for the flow of centrifuged air, open towards the suction inlet.

1 . A centrifugal electric pump ( 1 ) for suction of aeriform fluids comprising:
 an electric motor ( 2 ) equipped with a shaft ( 3 );   a cylindrical suction box ( 4 ) provided with an inlet ( 5 ) for the aeriform fluid positioned centrally with respect to a bottom ( 4 ′) of said box, with one or more outlet openings ( 6 ) arranged on the lateral wall ( 4 ″) thereof and with a closing cover ( 7 ) also arranged for acting as base for said motor ( 2 );   at least one fan ( 8 ), splined onto said shaft ( 3 ) and driven in movement by said motor ( 2 ), arranged for sucking a flow of air (F) from said inlet ( 5 ), centrifuge it and discharge it outside said suction box ( 4 ) through said one or more outlet openings ( 6 ),   
       characterized in that it comprises a silencing device arranged inside said suction box ( 4 ), wherein said silencing device comprises an annular deflector ( 9 ), placed in front of said outlet openings ( 6 ), so as to interrupt the direct path of the flow of centrifuged air (F) between said at least one fan ( 8 ) and said outlet openings ( 6 ), and arranged for creating a shaped annular damping chamber ( 10 ) for the flow of centrifuged air (F), open towards said suction inlet ( 5 ). 
     
     
         2 . A centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said annular deflector ( 9 ) forms an acute angle (α) with said lateral wall ( 4 ″) of said suction box ( 4 ), so that said shaped annular damping chamber ( 10 ) has a triangular or trapezoidal cross section. 
     
     
         3 . A centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that the edge ( 11 ) of said annular deflector ( 9 ) with larger circumference cooperates with the lateral wall ( 4 ″) of the suction box ( 4 ) to produce a joint with interference fit. 
     
     
         4 . A centrifugal electric pump ( 1 ) according to  claim 1 , characterized in that said annular deflector ( 9 ) comprises a shaped wing ( 12 ) bent parallel to said closing cover ( 7 ).