Diagonal impeller for a diagonal fan, and diagonal fan

Abstract

A diagonal impeller for a diagonal fan ( 11 ), comprising a carrier plate ( 33 ) over the outer periphery of which a plurality of vanes ( 36 ) are distributed and which consists of a rotationally symmetrical main body ( 60 ), which upstream has a closed head region ( 63 ), which transitions in a flowing manner into a lateral surface ( 67 ), which extends as far as the foot region ( 68 ), wherein the diameter of the foot region ( 68 ) is greater than that of the head region ( 63 ) and the vanes ( 36 ) extend at least over portions along the lateral surface ( 67 ), and wherein the lateral surface ( 67 ) has at least one S-shaped undulation ( 70 ) between the foot region ( 68 ) and the head region ( 63 ). (See FIG. 1 ).

1 . Diagonal impeller for a diagonal fan, comprising a carrier plate over the outer periphery of which a plurality of vanes are distributed and which consists of a rotationally symmetrical main body, which upstream has a closed head region, which transitions in a flowing manner into a lateral surface, which extends as far as the foot region, the diameter of the foot region being greater than that of the head region and the vanes extending at least over portions along the lateral surface, characterised in that the lateral surface has at least one S-shaped undulation between the foot region and the head region. 
     
     
         2 . Diagonal impeller according to  claim 1 , wherein the lateral surface, starting from the head region, has a first portion with a small gradient angle to the axis of rotation and transitions in a second portion, arranged downstream of the first portion, with a gradient angle greater than then gradient angle of the first portion. 
     
     
         3 . Diagonal impeller according to  claim 1 , wherein the transition from a smaller gradient angle into a steeper gradient angle of the lateral surface is provided in the central region of the flow path along the carrier plate. 
     
     
         4 . Diagonal impeller according to  claim 1  wherein, starting from a virtual conical lateral surface between the foot region and the head region, a first undulation of the S-shaped undulation runs radially outside the virtual conical lateral surface and an adjoining second undulation of the S-shaped undulation runs within the virtual conical lateral surface and a successive third undulation of the S-shaped undulation runs outside the virtual conical lateral surface. 
     
     
         5 . Diagonal impeller according to  claim 1 , wherein the main body of the carrier plate is bell-shaped. 
     
     
         6 . Diagonal fan for gaseous media, comprising a diagonal impeller, which has a carrier plate with a plurality of vanes arranged thereon, with a guide device attached to said diagonal impeller in a downstream direction to increase the pressure of the medium and with a cover plate, which surrounds the carrier plate in the radial direction and extends along the carrier plate, at least over portions, in the axial direction, wherein the diagonal impeller is designed according to  claim 1 . 
     
     
         7 . Diagonal fan according to  claim 6 , wherein a gap is formed between the vanes of the carrier plate and the cover plate. 
     
     
         8 . Diagonal fan according to  claim 6 , wherein the cover plate is arranged on the vane ends of the vanes of the carrier plate. 
     
     
         9 . Diagonal fan according to  claim 6 , wherein the cover plate has at least one S-shaped undulation along its peripheral surface between an inlet region and an outlet region. 
     
     
         10 . Diagonal fan according to  claim 6 , wherein the S-shaped undulation runs in the cover plate in a manner corresponding to the S-shaped undulation in the carrier plate.