US2011058946A1PendingUtilityA1

Fan and method for operating a fan

34
Assignee: SADIKOVIC ADAMOPriority: May 5, 2008Filed: Jan 8, 2009Published: Mar 10, 2011
Est. expiryMay 5, 2028(~1.8 yrs left)· nominal 20-yr term from priority
Inventors:Adamo SadikovicStefan RichlBernd Altvater
F04D 29/305F04D 29/282
34
PatentIndex Score
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Cited by
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Claims

Abstract

The invention relates to a fan, particularly a radial fan, having a fan hub with a rotational axis. A plurality of fan blades is disposed about the rotational axis for deflecting an air flow. The invention provides that an adjustment device is provided at the fan blades for the rotational speed-dependant adjustment of an air flow.

Claims

exact text as granted — not AI-modified
1 - 12 . (canceled) 
     
     
         13 . A fan, in particular a radial fan, having
 a fan hub with a rotational axis,   a plurality of fan blades disposed on the fan hub for deflecting an air flow about the rotational axis, and   an adjusting device provided on the fan blades for rpm-dependent adjustment of an air flow.   
     
     
         14 . The fan as defined by  claim 13 , wherein a region, deformable by centrifugal force and fluid force, of at least one of the fan blades forms a component of the adjusting device. 
     
     
         15 . The fan as defined by  claim 14 , wherein the fan blade, along a longitudinal chord thereof, is connected at least in some regions to the fan hub and/or to a fan cover disk and is separated in some regions from the fan hub and/or from the fan cover disk. 
     
     
         16 . The fan as defined by  claim 14 , wherein in a forward curvature of the fan blade, a region thereof near a circumference of the fan hub, is connected to the fan hub and/or to a fan cover disk. 
     
     
         17 . The fan as defined by  claim 15 , wherein in a forward curvature of the fan blade, a region thereof near a circumference of the fan hub, is connected to the fan hub and/or to the fan cover disk. 
     
     
         18 . The fan as defined by  claim 14 , wherein in a rearward curvature of the fan blade, a region thereof near the rotational axis and/or a region thereof near a circumference of the fan hub is connected to the fan hub and/or to a fan cover disk. 
     
     
         19 . The fan as defined by  claim 15 , wherein in a rearward curvature of the fan blade, a region thereof near the rotational axis and/or a region thereof near a circumference of the fan hub is connected to the fan hub and/or to the fan cover disk. 
     
     
         20 . The fan as defined by  claim 14 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         21 . The fan as defined by  claim 15 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         22 . The fan as defined by  claim 16 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         23 . The fan as defined by  claim 17 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         24 . The fan as defined by  claim 18 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         25 . The fan as defined by  claim 19 , wherein the fan blade in separated regions is embodied as more flexible than in connected regions. 
     
     
         26 . The fan as defined by  claim 13 , wherein in addition to fan blades at the fan hub and/or a fan cover disk, movable elements are provided, which vary the air flow as a function of rpm. 
     
     
         27 . The fan as defined by  claim 25 , wherein in addition to fan blades at the fan hub and/or the fan cover disk, movable elements are provided, which vary the air flow as a function of rpm. 
     
     
         28 . The fan as defined by  claim 13 , wherein a device separate from the fan hub is provided for adjusting the fan blades. 
     
     
         29 . A method for operating a fan as defined by  claim 13 , which includes varying an air flow at the fan blades as a function of rpm in such a way that at high rotary speeds, a higher moment of the fan, compared with an rpm-dependent moment characteristic, is established without adjustment. 
     
     
         30 . A method for operating a fan as defined  claim 13 , which includes varying an air flow at the fan blades as a function of rpm in such a way that at low rotary speeds, a higher ratio between a volume flow and the rpm of the fan is established than at high rotary speeds. 
     
     
         31 . An electric power tool having a fan as defined by  claim 13 . 
     
     
         32 . An electrical appliance having a fan as defined by  claim 13 .

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