Compact centrifugal fan

Abstract

The invention relates to a compact centrifugal fan, in which a motor mounting lies on an elastomeric element arranged in a through-opening between the fan housing and the motor mounting, said motor mounting being fixed to the fan housing by means of the elastomeric element.

What is claimed is: 
     
         1 . A centrifugal fan, in particular a gas fan ( 1 ), the centrifugal fan comprising:
 a fan housing with a fan wheel arranged in the fan housing, the fan housing defining a through opening for running a drive shaft through to be connected to the fan wheel, wherein   an electromotor is arranged on an outside of the fan housing and held by a motor mounting,   a part of the motor mounting extends through the through opening into an interior of the fan housing and   the motor mounting lies on an elastomeric element arranged on the through opening between the fan housing and the motor mounting and is fixed by the elastomeric element on the fan housing.   
     
     
         2 . The centrifugal fan according to  claim 1 , wherein the elastomeric element is constructed as a seal of the motor mounting opposite an edge of the through opening of the fan housing and is arranged directly between the fan housing and the motor mounting. 
     
     
         3 . The centrifugal fan according to  claim 1 , wherein a sealing test edge running circumferentially on the outside is provided on the motor mounting. 
     
     
         4 . The centrifugal fan according to  claim 1 , wherein the part of the motor mounting extending into the interior of the fan housing extends into a free space provided on the fan wheel or a hub of the fan wheel. 
     
     
         5 . The centrifugal fan according to  claim 1 , wherein the drive shaft is supported by a ball bearing and a sliding bearing in the motor mounting. 
     
     
         6 . The centrifugal fan according to  claim 5 , wherein the motor mounting comprises a holder on which the ball bearing rests. 
     
     
         7 . The centrifugal fan according to  claim 5 , wherein a rotor of the electromotor is arranged between the ball bearing and the sliding bearing and that the ball bearing is located axially on the inner side, i.e., closer to the fan wheel. 
     
     
         8 . The centrifugal fan according to  claim 1 , wherein the electromotor is a direct current motor. 
     
     
         9 . The centrifugal fan according to  claim 8 , wherein a rotor of the direct current motor is fastened on the drive shaft and a position of the rotor opposite a stator of the direct current motor is offset by a predetermined axial length from a zero position to an outside, i.e., in a direction away from the fan wheel. 
     
     
         10 . The centrifugal fan according to  claim 1 , wherein a rectangular guide plate is provided to control the electromotor. 
     
     
         11 . The centrifugal fan according to  claim 10 , wherein the guide plate can be fastened on the motor mounting radially offset from the drive shaft by a length. 
     
     
         12 . The centrifugal fan according to  claim 11 , wherein the guide plate is arranged on the motor mounting in a position to a side of or below the electromotor and is not influenced by a heat flow caused by the operation of the electromotor. 
     
     
         13 . The centrifugal fan according to  claim 10 , wherein a motor protection cap with a circumferential edge is provided that covers at least the electromotor, the guide plate and the motor mounting and rests with a circumferential edge on the fan housing. 
     
     
         14 . The centrifugal fan according to  claim 13 , wherein the motor protection cap is fastened directly on the fan housing. 
     
     
         15 . The centrifugal fan according to  claim 1 , wherein at least one air conduction conduit is injected into the motor protection cap.