Air-guiding cover and fan having the same

Abstract

The present invention relates to provide an air-guiding cover, comprising: an inner ring; an outer ring being arranged around the inner ring and defining a windward plane between the outer ring and the inner ring; and a plurality of air-guiding fins being arranged in the inner ring. The air-guiding fins have an inclination with respect to a normal axis of the windward plane, and the inclination increases progressively as the air-guiding fins extend from the inner ring toward the outer ring.

1 . An air-guiding cover, comprising:
 an inner ring;   an outer ring being arranged around the inner ring and defining a windward plane together with the inner ring therebetween; and   a plurality of air-guiding fins being arranged in the windward plane in a whirlpool-like pattern, wherein the air-guiding fins have an inclination with respect to a normal axis of the windward plane, and the inclination increases progressively as the air-guiding fins extend from the inner ring toward the outer ring.   
     
     
         2 . The air-guiding cover of  claim 1 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the inner ring is about 0 degree. 
     
     
         3 . The air-guiding cover of  claim 1 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the outer ring is about 45 degrees. 
     
     
         4 . The air-guiding cover of  claim 1 , further comprising a fastening ring located between the inner ring and the outer ring and connected to the air-guiding fins, respectively. 
     
     
         5 . The air-guiding cover of  claim 1 , wherein the outer ring is provided with one or plural clips that are connected to an external structure. 
     
     
         6 . A fan, comprising:
 a housing comprising an air inlet portion, an air outlet portion, and a guiding space defined between the air inlet portion and the air outlet portion;   a rotating device being located in the guiding space and aligned with the air outlet portion, the rotating device comprising a motor fixedly installed in the housing and a blade connected to the motor and driven by the motor to rotate; and   an air-guiding cover being provided at the air outlet portion and comprising an inner ring, an outer ring being arranged around the inner ring, a plurality of air-guiding fins being arranged between the outer ring and the inner ring in a whirlpool-like pattern, the outer ring and the inner ring defining a windward plane therebetween, the air-guiding fins having an inclination with respect to a normal axis of the windward plane, and the inclination increasing progressively as the air-guiding fins extend from the inner ring toward the outer ring.   
     
     
         7 . The fan of  claim 6 , wherein the fan comprises a heating device located in the guiding space and serving to heat air flow passing therethrough. 
     
     
         8 . The fan of  claim 6 , wherein the rotating device comprises a heat-insulating tube mounted around the motor. 
     
     
         9 . The fan of  claim 6 , wherein the housing comprises an air entrance located behind the motor. 
     
     
         10 . The fan of  claim 6 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the inner ring is about 0 degree. 
     
     
         11 . The fan of  claim 6 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the outer ring is about 45 degrees. 
     
     
         12 . The fan of  claim 6 , further comprising a fastening ring located between the inner ring and the outer ring and connected to the air-guiding fins, respectively. 
     
     
         13 . The fan of  claim 6 , wherein the outer ring is provided with one or plural clips that are connected to the housing. 
     
     
         14 . The air-guiding cover of  claim 2 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the outer ring is about 45 degrees. 
     
     
         15 . The fan of  claim 10 , wherein the inclination of the air-guiding fins at where the air-guiding fins joint the outer ring is about 45 degrees.