Heat Dissipating Unit And Heat Dissipating Device Having The Heat Dissipating Unit

Abstract

A heat dissipating unit includes a plurality of heat dissipating fins arranged in an annular array and each including a flow guide plate extending from an inner side to an outer side of the annular array, two connecting plates respectively connected to and forming an angle with two opposite sides of the flow guide plate, and an air inlet and an air channel communicating fluidly with each other. Each connecting plate includes a connecting hole, a slanting edge opposite to the flow guide plate, and a connecting portion projecting from the slanting edge. The connecting portions of the connecting plates of each heat dissipating fin engage respectively the connecting holes in the connecting plates of an adjacent heat dissipating fin. The heat dissipating fins overlap each other so that the air inlets of the heat dissipating fins are arranged in a staggered manner.

We claim: 
     
         1 . A heat dissipating unit, comprising:
 a plurality of first heat dissipating fins arranged in an annular array for surrounding an impeller, each of said first heat dissipating fins including a flow guide plate extending from an inner side of said annular array to an outer side of said annular array, two connecting plates respectively connected to and forming an angle with two opposite sides of said flow guide plate, an air inlet formed by said flow guide plate and said connecting plates in proximity to said inner side of said annular array, and an air channel formed by said flow guide plate and said connecting plates and communicating fluidly with said air inlet, said flow guide plate being parallel with a flow direction of air stream generated by said impeller, each of said connecting plates tapering from said outer side to said inner side, and including a connecting hole adjacent to said flow guide plate, a slanting edge extending in an inner-to-outer direction and opposite to said flow guide plate, and a connecting portion projecting from said slanting edge, said connecting portions of said connecting plates of each of said first heat dissipating fins engaging respectively said connecting holes in said connecting plates of an adjacent one of said first heat dissipating fins, said first heat dissipating fins overlapping each other so that said air inlets of said first heat dissipating fins are arranged in a staggered manner.   
     
     
         2 . The heat dissipating unit of  claim 1 , wherein said first heat dissipating fins are arranged in a circular array. 
     
     
         3 . The heat dissipating unit of  claim 2 , wherein said air channel of each of said first heat dissipating fins is partially covered by said flow guide plate of an adjacent one of said first heat dissipating fins and is partially exposed at said inner side of said annular array. 
     
     
         4 . The heat dissipating unit of  claim 3 , wherein said slanting edge of each of said first heat dissipating fins abuts against said flow guide plate of the adjacent one of said first heat dissipating fins. 
     
     
         5 . The heat dissipating unit of  claim 1 , further comprising a plurality of second heat dissipating fins each of which is connected between two adjacent ones of said first heat dissipating fins, said air inlets of said first heat dissipating fins having the same distance from a center of rotation of the impeller. 
     
     
         6 . The heat dissipating unit of  claim 5 , wherein said second heat dissipating fins have a same configuration as said first heat dissipating fins, the length of each of said second heat dissipating fins measured in the inner-to-outer direction being shorter than the length of each of said first heat dissipating fins measured in the inner-to-outer direction, every two adjacent ones of said first heat dissipating fins defining a gap proximate to said inner side of said annular array, said gap communicating fluidly with an air channel of each of said second heat dissipating fins and said air channel of one of said two adjacent ones of said first heat dissipating fins. 
     
     
         7 . The heat dissipating unit of  claim 6 , wherein said first heat dissipating fins are arranged in a circular array. 
     
     
         8 . The heat dissipating unit of  claim 7 , wherein said slanting edge of each of said first heat dissipating fins abuts against said flow guide plate of the adjacent one of said first heat dissipating fins. 
     
     
         9 . A heat dissipating device, comprising:
 a heat dissipating fan including a casing and an impeller, said casing being formed with a receiving space, an air inlet communicating fluidly with said receiving space, and an air outlet communicating fluidly with said air inlet of said casing, said impeller being disposed in said receiving space; and   a heat dissipating unit disposed in said receiving space and surrounding said impeller, said heat dissipating unit including a plurality of first heat dissipating fins arranged in an annular array, each of said first heat dissipating fins including a flow guide plate extending from an inner side of said annular array to an outer side of said annular array, two connecting plates respectively connected to and forming an angle with two opposite sides of said flow guide plate, an air inlet formed by said flow guide plate and said connecting plates in proximity to said inner side of said annular array, and an air channel formed by said flow guide plate and said connecting plates and communicating fluidly with said air inlet, said flow guide plate being parallel with a flow direction of air stream generated by said impeller, each of said connecting plates tapering from said outer side to said inner side, and including a connecting hole adjacent to said flow guide plate, a slanting edge extending in an inner-to-outer direction and opposite to said flow guide plate, and a connecting portion projecting from said slanting edge, said connecting portions of said connecting plates of each of said first heat dissipating fins engaging respectively said connecting holes in said connecting plates of an adjacent one of said first heat dissipating fins, said first heat dissipating fins overlapping each other so that said air inlets of said first heat dissipating fins are arranged in a staggered manner.   
     
     
         10 . The heat dissipating device of  claim 9 , wherein said first heat dissipating fins are arranged in a circular array. 
     
     
         11 . The heat dissipating unit of  claim 10 , wherein said air channel of each of said first heat dissipating fins is partially covered by said flow guide plate of an adjacent one of said first heat dissipating fins and is partially exposed at said inner side of said annular array. 
     
     
         12 . The heat dissipating unit of  claim 11 , wherein said slanting edge of each of said first heat dissipating fins abuts against said flow guide plate of the adjacent one of said first heat dissipating fins. 
     
     
         13 . The heat dissipating unit of  claim 9 , further comprising a plurality of second heat dissipating fins each of which is connected between two adjacent ones of said first heat dissipating fins, said air inlets of said first heat dissipating fins having the same distance from a center of rotation of the impeller. 
     
     
         14 . The heat dissipating unit of  claim 13 , wherein said second heat dissipating fins have a same configuration as said first heat dissipating fins, the length of each of said second heat dissipating fins measured in an inner-to-outer direction being shorter than the length of each of said first heat dissipating fins measured in the inner-to-outer direction, every two adjacent ones of said first heat dissipating fins defining a gap proximate to said inner side of said annular array, said gap communicating fluidly with said air channel of each of said second heat dissipating fins and said air channel of one of said two adjacent ones of said first heat dissipating fins. 
     
     
         15 . The heat dissipating unit of  claim 14 , wherein said first heat dissipating fins are arranged in a circular array. 
     
     
         16 . The heat dissipating unit of  claim 15 , wherein said slanting edge of each of said first heat dissipating fins abuts against said flow guide plate of the adjacent one of said first heat dissipating fins.