Radial ventilator

Abstract

A radial ventilator (1) has a base part (2), a housing part (4), with a discharge 33, placed on the base part (2), a motor electronics unit (98), and an internal rotor electric motor. The motor drives a ventilator wheel (3) via a shaft (7). The motor electronics unit (98) and a stator (32) of the electric motor are encapsulated by an extrusion coating (17) in the base part (2) and together form an integral one-piece structural unit. The radial ventilator (1) has a pressure chamber (D) enlarging in a spiral shape around the ventilator wheel (3). The pressure chamber (D) is formed and defined by the housing part (4) and the extrusion coating (17).

1 .- 16 . (canceled) 
     
     
         17 . A radial ventilator comprising: a base part, a housing part placed on the base part, a motor electronics unit, and an internal rotor electric motor;
 a ventilator wheel drive via a shaft of the electric motor;   the motor electronics unit and a stator of the electric motor are encapsulated by an extrusion coating in the base part and together form an integral one-piece structural unit; the radial ventilator has a pressure chamber expanding in a spiral shape around the ventilator wheel, the pressure chamber is formed and defined by the housing part and the extrusion coating.   
     
     
         18 . The radial ventilator as claimed in  claim 17 , wherein the extrusion coating comprises a protruding ring section extending in the axial direction, the axial end face of the ring section defines the pressure chamber and the ring section defines a receptacle chamber for the motor electronics unit. 
     
     
         19 . The radial ventilator as claimed in  claim 17 , wherein the spiral-shaped pressure chamber is formed by an axial and radial expansion. 
     
     
         20 . The radial ventilator as claimed in  claim 17 , wherein the housing part has a constant diameter delimiting the pressure chamber and a spiral shape of the pressure chamber is exclusively defined by the extrusion coating. 
     
     
         21 . The radial ventilator as claimed in  claim 17 , wherein the electric motor is arranged on a first axial side of the motor electronics unit and the pressure chamber is arranged on a second axial side of the motor electronics unit, which is opposite to the first axial side. 
     
     
         22 . The radial ventilator as claimed in  claim 17 , wherein the motor electronics unit is arranged on a printed circuit board and the printed circuit board is enclosed by the extrusion coating. 
     
     
         23 . The radial ventilator as claimed in  claim 17 , wherein the base part has a cylindrical recess around a rotational axis for the shaft, in which a rotor of the electric motor fastened on the shaft is inserted. 
     
     
         24 . The radial ventilator as claimed in  claim 23 , wherein the recess has a closed bottom, which is formed by the extrusion coating. 
     
     
         25 . The radial ventilator as claimed in  claim 23 , wherein a ring-shaped flow divider enclosing the ventilator wheel is arranged radially adjoining the ventilator wheel, which forms a diffuser, which merges directly into the pressure chamber, together with the housing part around the ventilator wheel. 
     
     
         26 . The radial ventilator as claimed in  claim 25 , wherein the flow divider rests on the extrusion coating. 
     
     
         27 . The radial ventilator as claimed in  claim 25 , wherein the flow divider is formed as a sleeve which is inserted into the recess. 
     
     
         28 . The radial ventilator as claimed in  claim 25 , wherein the flow divider protrudes in the radial direction at least in regions in relation to a radial inner wall surface of the extrusion coating and thus forms an axial surface of the pressure chamber. 
     
     
         29 . The radial ventilator as claimed in  claim 25 , wherein the flow divider has a cup-like axial indentation, which has a diameter which essentially corresponds to an external diameter of the ventilator wheel, wherein the ventilator wheel is axially inserted in sections into the indentation. 
     
     
         30 . The radial ventilator as claimed in  claim 29 , further comprising at least one bearing for mounting the shaft, wherein the at least one bearing is arranged between the flow divider and the shaft. 
     
     
         31 . The radial ventilator as claimed in  claim 25 , wherein the flow divider has a rounding at least in sections on its free end facing toward the pressure chamber. 
     
     
         32 . The radial ventilator as claimed in  18 , wherein the axially protruding ring section of the extrusion coating has a circumferential axial projection on its radial outer edge section and presses against an inner wall surface of the housing part.