Structure of wind direction cover of electric fan

Abstract

The invention provides a wind direction cover of an electric fan, comprising a central cap, an external circular frame, a plurality of wind guiding blades between the central cap and the external circular frame which are concentric with the central cap, and a plurality of anchor plates of the wind guiding blades. The exterior side of the most internal wind guiding blade is parallel to the flank of the central cap, and the exterior sides of external wind guiding blades slant toward the external circular frame, angulating the exterior sides of the wind guiding blades with the parallel plane of the flank of the central cap, and the more external the wind guiding blade is, the larger its angle slanting toward the external circular frame is.

1 . A wind direction cover of an electric fan, comprising a central cap, an external circular frame, a plurality of wind guiding blades between the central cap and the external circular frame which are concentric with the central cap, and a plurality of anchor plates of the wind guiding blades; the wind direction cover is characterized in that the exterior side of the most internal wind guiding blade is parallel to the flank of the central cap, and the exterior sides of external wind guiding blades slant toward the external circular frame, angulating the exterior sides of the wind guiding blades with the parallel plane of the flank of the central cap, and the more external the wind guiding blade is, the larger its angle slanting toward the external circular frame is, until the exterior side of the most external wind guiding blade formulates an angle with the plane parallel to the flank of the central cap to about 10 to 50 degrees. 
     
     
         2 . The wind direction cover of electric fan of  claim 1 , further comprising two second division lines between the central cap and the external circular frame that stretch from the central cap toward the external circular frame to divide the wind direction cover into first large-angle regions and second large-angle regions, wherein the first large-angle regions are located oppositely at the right and the left side of the central cap, and the second large-angle regions are located oppositely at the upper side and the lower side of the central cap, and wherein the angles between the exterior sides of the wind guiding blades of the second large-angle regions and the planes parallel to the flank of the central cap is smaller than the angles between the exterior sides of the wind guiding blades of the first large-angle regions and the planes parallel to the flank of the central cap. 
     
     
         3 . The wind direction cover of electric fan of  claim 1 , further comprising an arc-shaped guiding channel on the exterior side of each wind guiding blade. 
     
     
         4 . The wind direction cover of electric fan of  claim 1 , wherein the closest distance between the exterior side of the most external wind guiding blade and the external circular frame is more than 3 millimeters. 
     
     
         5 . The wind direction cover of electric fan of  claim 1 , wherein the distances between intersection points of the exterior sides of the wind guiding blades and the planes parallel to the flank of the central cap are the same. 
     
     
         6 . The wind direction cover of electric fan of  claim 1 , which is secured on a box fan. 
     
     
         7 . The wind direction cover of electric fan of  claim 1 , which is secured on a standing fan. 
     
     
         8 . The wind direction cover of electric fan of  claim 1 , which is secured on a ceiling fan. 
     
     
         9 . The wind direction cover of electric fan of  claim 1 , which is made of plastic. 
     
     
         10 . The wind direction cover of electric fan of  claim 1 , which is made of metal. 
     
     
         11 . A wind direction cover of electric fan, comprising a central cap, an external circular frame, a plurality of wind guiding blades between the central cap and the circular frame which are concentric with the central cap, and a plurality of anchor plates of the wind guiding blades; the wind direction cover is characterized in that a first division line is set between the external circular frame and the central cap that surrounds the central cap, to divide the wind direction cover into a straight air-outlet region located between the first division line and the central cap and a large-angle air-outlet region located between the external circular frame and the first division line; wherein the exterior sides of the wind guiding blades of the straight air-outlet region are parallel to the flank of the central cap, and the exterior sides of the wind guiding blades of the large-angle air-outlet region slant toward the external circular frame, angulating the exterior sides of the wind guiding blades with the planes parallel to the flank of the cylinder, the more external the wind guiding blade is, the larger its angle slanting toward the external circular frame is, until the exterior side of the most external wind guiding blade formulates an angle with the plane parallel to the flank of the central cap to approximately 10 to 50 degrees. 
     
     
         12 . The wind direction cover of electric fan of  claim 11 , further comprising two second division lines between the central cap and the external circular frame that stretch from the central cap toward the external circular frame to divide the wind direction cover into first large-angle regions and second large-angle regions, wherein the first large-angle regions are located oppositely at the right and the left side of the central cap, and the second large-angle regions are located oppositely at the upper side and the lower side of the central cap, and wherein the angles between the exterior sides of the wind guiding blades of the second large-angle regions and the planes parallel to the flank of the central cap is smaller than the angles between the exterior sides of the wind guiding blades of the first large-angle regions and the planes parallel to the flank of the central cap. 
     
     
         13 . The wind direction cover of electric fan of  claim 11 , further comprising an arc-shaped guiding channel on the exterior side of each wind guiding blade of the large-angle air-outlet region. 
     
     
         14 . The wind direction cover of electric fan of  claim 11 , wherein the closest distance between the exterior side of the most external wind guiding blade and the external circular frame is more than 3 millimeters. 
     
     
         15 . The wind direction cover of electric fan of  claim 11 , wherein the distances between intersection points of the exterior sides of the wind guiding blades and the planes parallel to the flank of the central cap are the same. 
     
     
         16 . The wind direction cover of electric fan of  claim 11 , which is secured on a box fan. 
     
     
         17 . The wind direction cover of electric fan of  claim 11 , which is secured on a standing fan. 
     
     
         18 . The wind direction cover of electric fan of  claim 11 , which is secured on a ceiling fan. 
     
     
         19 . The wind direction cover of electric fan of  claim 11 , which is made of plastic. 
     
     
         20 . The wind direction cover of electric fan of  claim 11 , which is made of metal.