Radial fan

Abstract

A radial fan, preferably a high-speed radial fan, includes a blower wheel, a housing which receives a rotor and a stator of an electrical drive of the blower wheel shaft, and a cooling system. To develop one such radial fan in terms of the cooling system required, paths for a first cooling medium and a second cooling medium are provided in the housing, the second cooling medium being cooled by the first cooling medium as provided for by the housing, and the paths are separated from each other by intact material walls of the housing.

1 . Radial fan ( 1 ), preferably high-speed radial fan, having an impeller ( 8 ) and a housing ( 2 ), the housing ( 2 ) accommodating a rotor ( 6 ) and a stator ( 5 ) of an electric drive ( 4 ) for the impeller shaft ( 7 ), a cooling means being provided, and paths ( 30 ,  37 ) being provided in the housing ( 2 ) for a first cooling medium (K 1 ) and a second cooling medium (K 2 ), for cooling of the second cooling medium (K 2 ) by the first cooling medium (K 1 ) by means of the housing ( 2 ), wherein the second cooling medium (K 2 ) is based on an internal gas flow which is closed off hermetically with respect to the exterior, in that the paths ( 30 ,  37 ) are separated from one another by uninterrupted material walls ( 40 ) of the housing ( 2 ) and, for this purpose, are formed by the casting process and/or as bores, the separation between the paths being achieved merely by way of intact housing material. 
     
     
         2 . Radial fan according to  claim 1 , wherein the paths ( 30 ,  37 ) in the housing ( 2 ) run at an angle in relation to one another. 
     
     
         3 . Radial fan according to  claim 1 , wherein the paths ( 30 ,  37 ) run perpendicularly to one another. 
     
     
         4 . Radial fan according to  claim 1 , wherein the paths ( 30 ,  37 ) of the first cooling medium (K 1 ) are disposed in the outer wall of the housing ( 2 ), in a cross-sectionally chamber-like housing recess ( 38 ). 
     
     
         5 . Radial fan according to  claim 4 , wherein two circumferentially distributed paths ( 37 ) of the first cooling medium (K 1 ) are routed in a chamber-like housing recess ( 38 ). 
     
     
         6 . Radial fan according to  claim 4 , wherein three or more chamber-like housing recesses ( 38 ) are provided over the circumference. 
     
     
         7 . Radial fan according to  claim 4 , wherein the chamber-like housing recesses ( 38 ) are bounded in the axial direction of the housing ( 2 ) by integral walls ( 41 ) of the housing ( 2 ). 
     
     
         8 . Radial fan according to  claim 4 , wherein the chamber-like housing recesses ( 38 ) are closed by a covering ( 42 ) extending in the axial direction of the housing ( 2 ). 
     
     
         9 . Radial fan according to  claim 8 , wherein the covering ( 42 ) is in the form of a tubular part ( 46 ) which encloses the housing ( 2 ). 
     
     
         10 . Radial fan according to  claim 4 , wherein one chamber-like housing recess ( 38 ) is formed as a cooling-medium infeed ( 44 ) and one chamber-like housing recess ( 38 ) is formed as a cooling-medium discharge ( 44 ). 
     
     
         11 . Radial fan according to  claim 1 , wherein the housing ( 2 ) is cylindrical, one end being associated with the impeller ( 8 ) and the other end being closed via a foot part ( 9 ). 
     
     
         12 . Radial fan according to  claim 11 , wherein the other end has a stepped formation, and the foot part ( 9 ) is stepped correspondingly. 
     
     
         13 . Radial fan according to  claim 4 , wherein the paths ( 37 ) of the first cooling medium (K 1 ) run further toward the inside, as seen in the radial direction, than the paths ( 30 ) of the second cooling medium (K 2 ) at least in the region between the chamber-like housing recesses ( 38 ), the second cooling medium (K 2 ) also passing through the interior of the housing ( 2 ). 
     
     
         14 . Radial fan according to  claim 1 , wherein the paths ( 37 ) of the first cooling medium (K 1 ), predominantly for the purpose of dissipating the power loss of the stator ( 5 ), are brought close to the stator ( 5 ). 
     
     
         15 . Radial fan according to  claim 1 , wherein axial bores are provided, which correspond to the paths ( 30 ) for the second cooling medium (K 2 ) and are used for accommodating electric lines. 
     
     
         16 . Radial fan ( 1 ), preferably high-speed radial fan, having an impeller ( 8 ) and a housing ( 2 ), the housing ( 2 ) accommodating a rotor ( 6 ) and a stator ( 5 ) of an electric drive ( 4 ) for the impeller shaft ( 7 ), a cooling means being provided and, furthermore, cooling in particular of the drive ( 4 ) being achieved by a partial gas stream (T) separated off from the gas which is to be compressed, wherein the partial gas stream is channeled, following separation, into paths ( 31 ) of a cooling-channel housing ( 14 ), which, for its part, is actively cooled at least indirectly. 
     
     
         17 . Radial fan according to  claim 16 , wherein the housing paths ( 31 ) are labyrinthine. 
     
     
         18 . Radial fan according to  claim 16 , wherein the housing paths ( 31 ) lead radially inward from the outside. 
     
     
         19 . Radial fan according to  claim 16 , wherein the partial gas stream (T) is branched off from the main gas stream (H) radially outside the impeller ( 8 ), in the region of a diffuser ( 20 ). 
     
     
         20 . Radial fan according to  claim 19 , wherein the partial gas stream (T) then passes through the housing wall ( 35 ) of the housing region which accommodates the electric drive ( 4 ). 
     
     
         21 . Radial fan according to  claim 16 , wherein it is at that end of the electric drive ( 4 ) which is directed away from the impeller ( 8 ) that the partial gas stream. (T) is channeled out of the housing ( 2 ) into the interspace between the stator ( 5 ) and rotor ( 6 ). 
     
     
         22 . Radial fan according to  claim 16 , wherein the drive shaft ( 7 ) is in the form of a hollow shaft, and wherein it is at that end of the electric drive ( 4 ) which is directed away from the impeller ( 8 ) that the partial gas stream (T) is channeled out of the housing ( 2 ) into the drive shaft ( 7 ). 
     
     
         23 . Radial fan according to  claim 16 , wherein the partial gas stream (T) is channeled back into the main gas stream (H) at the radially outer periphery of the impeller ( 8 ). 
     
     
         24 . Radial fan according to  claim 16 , wherein the active cooling means of the housing ( 2 ) is in the form of a water cooling means. 
     
     
         25 . Radial fan according to  claim 16 , wherein the gas consists of helium and/or nitrogen and/or is air and/or is a mixture of two or more of the gases mentioned.