Duct fan in the form of a centrifugal fan

Abstract

A duct fan ( 1 ) has a centrifugal fan with a motor ( 10 ) and a centrifugal impeller ( 11 ). A housing has an intake shell ( 2 ) on an intake side, that defines an intake portion ( 52 ), and accommodates the centrifugal impeller ( 11 ). The housing also has an exhaust shell ( 3 ) on an exhaust side that defines an exhaust portion ( 53 ). A bowl-shaped motor mount ( 5 ) is arranged in the exhaust shell ( 3 ). A continuous flow channel ( 20 ) to the exhaust portion ( 53 ) is formed between the motor mount ( 5 ) and the exhaust shell ( 3 ). A flow (S) generated by the centrifugal impeller ( 11 ), during operation, is guided by the flow channel ( 20 ).

1 - 15 . (canceled) 
     
     
         16 . A duct fan comprising:
 a centrifugal fan with a motor and a centrifugal impeller;   a housing includes an intake shell on an intake side defining an intake portion, the intake shell accommodates the centrifugal impeller;   an exhaust shell on an exhaust side defines an exhaust portion:   a bowl-shaped motor mount, for fixedly receiving the motor, is arranged in the exhaust shell, and   a continuous flow channel, to the exhaust portion, is formed between the motor mount and the exhaust shell and a flow (S) generated by the centrifugal impeller during operation, is guided through the flow channel.   
     
     
         17 . The duct fan as set forth in  claim 16 , further comprising a plurality of downstream guide vanes, distributed in a circumferential direction, are arranged in the flow channel. 
     
     
         18 . The duct fan as set forth in  claim 17 , wherein the downstream guide vanes extend from an outer lateral surface of the motor mount to an inner wall surface of the exhaust shell and subdivide the flow channel into a plurality of individual channels in the circumferential direction. 
     
     
         19 . The duct fan as set forth in  claim 16 , wherein the downstream guide vanes are integrally formed on the motor mount. 
     
     
         20 . The duct fan as set forth in  claim 16 , further comprising receiving grooves on the exhaust shell for secured insertion of fastening webs formed on the motor mount. 
     
     
         21 . The duct fan as set forth in  claim 20 , wherein the receiving grooves are formed in a tubular end portion of the exhaust shell defining the exhaust portion. 
     
     
         22 . The duct fan as set forth in  claim 20 , wherein the fastening webs are formed by downstream guide vanes. 
     
     
         23 . The duct fan as set forth in  claim 17 , wherein the plurality of downstream guide vanes extend in an axial flow direction beyond a shell of the motor mount that forms the flow channel. 
     
     
         24 . The duct fan as set forth in  claim 23 , wherein the shell of the motor mount that forms the flow channel has an axial projection that extends around in the circumferential direction, defines an intake portion of the flow channel, and protrudes axially in the direction of the centrifugal impeller relative to the downstream guide vanes. 
     
     
         25 . The duct fan as set forth in  claim 17 , wherein the plurality of downstream guide vanes are curved in some portions in the circumferential direction, particularly in an arc shape, and end so as to extend axially in the axial flow direction. 
     
     
         26 . The duct fan as set forth in  claim 16 , further comprising a wall portion of a shell that forms the flow channel of the motor mount is perforated with through holes. 
     
     
         27 . The duct fan as set forth in  claim 26 , wherein the shell of the motor mount has an axially centered motor base for mounting the motor and defines a receiving space between an inner wall surface of the perforated wall portion of the shell and the motor base for the arrangement of noise-reducing insulation material. 
     
     
         28 . The duct fan as set forth in  claim 17 , wherein the exhaust shell has a respective radial widening in the region of the flow channel between the plurality of downstream guide vanes as viewed in the circumferential direction for accommodating noise-reducing insulation material. 
     
     
         29 . The duct fan as set forth in  claim 16 , wherein the intake shell and the exhaust shell can be secured to one another by a fastening device when placed on top of one another and, in so doing, establish a position of the motor mount in the exhaust shell. 
     
     
         30 . The duct fan as set forth in  claim 16 , wherein a maximum outside diameter of a shell of the motor mount on the intake side is larger than an outside diameter of the centrifugal impeller.