Side-channel blower / aspirator with an improved impeller

Abstract

The side-channel blower/aspirator ( 1 ), comprises an impeller ( 2 ) equipped with a plurality of blades ( 21 ) and a casing ( 13, 14 ), in which the impeller ( 2 ) is enclosed and within which an annular conduit (C) is defined in which the blades ( 21 ) rotate. The blades ( 21 ) comprise at least one longitudinally curved portion, defining a concavity ( 23 ) facing the advancement direction of the blades ( 21 ) within the conduit.

1 . Side-channel blower/aspirator ( 1 ), comprising at least one impeller ( 2 ) equipped with a plurality of blades ( 21 ) and a casing ( 13 ,  14 ), in which said impeller ( 2 ) is enclosed and within which an annular conduit (C) is defined in which said blades ( 21 ) rotate, characterised in that the blades ( 21 ) comprise at least one longitudinally curved portion, defining a concavity ( 23 ) facing the advancement direction of the blades ( 21 ) within said conduit. 
     
     
         2 . The machine ( 1 ) according to  claim 1 , wherein said blades ( 21 ) have a longitudinal curvature along their entire longitudinal extension. 
     
     
         3 . The machine ( 1 ) according to  claim 1 , wherein the impeller ( 2 ) comprises a central body ( 24 ) from which said blades ( 21 ) extend, which are arranged tangentially to a circumferential portion ( 25 ) of the central body ( 24 ). 
     
     
         4 . The machine according to  claim 3 , wherein the impeller ( 2 ) comprises a central body ( 24 ) from which said blades ( 21 ) extend, each blade ( 21 ) being provided with a proximal portion ( 210 ) joined to a circumferential portion ( 25 ) of the central body ( 24 ), said proximal portion ( 210 ) of the blade ( 21 ) being curved so as to be tangential to said circumferential portion ( 25 ) of the central body ( 24 ). 
     
     
         5 . The machine ( 1 ) according to  claim 1 , wherein the impeller ( 2 ) comprises a central body ( 24 ) axial symmetric to which said blades ( 21 ) are joined at respective joining zones, each blade ( 21 ) being completely contained within one of the two semi-spaces defined by an ideal diametral plane which joins the axis of the central body ( 24 ) to the joining zone between the blade ( 21 ) and the central body ( 24 ). 
     
     
         6 . The machine ( 1 ) according to  claim 1 , wherein each of said blades comprises at least one transversally curved portion. 
     
     
         7 . The machine ( 1 ) according to  claim 6 , wherein each of said blades is equipped with a transversal curvature along its whole longitudinal extension.