Fan assembly

Abstract

A fan assembly includes a rack, a shield, and a fan. The rack defines a first vent opening and a second vent opening aligned with the first vent opening. The shield is mounted in the rack and aligned with the first vent opening. The shield defines a circular opening corresponding to the first vent opening. A plurality of shielding pieces are pivotally mounted in the circular opening. The plurality of shielding pieces together form a circular shield in themselves to cover the circular opening by gravity. The fan is mounted in the rack and aligned with the second vent opening and the shield. The fan blows air towards the plurality of shielding pieces and rotates the shielding pieces to define an air passage between each two adjacent shielding pieces. The air passage allows air to flow therethrough only when the fan is operating.

1 . A fan assembly, comprising:
 a rack defining a first vent opening and a second vent opening aligned to the first vent opening;   a shield mounted in the rack and aligned to the first vent opening, the shield defining a circular opening corresponding to the first vent opening, a plurality of shielding pieces pivotally mounted in the circular opening, opposite ends of each of the plurality of shielding piece arc-shaped, the plurality of shielding pieces together forming a circle to shield the circular opening by gravity; and   a fan mounted in the rack and aligned to the second vent opening and the shield; the fan adapted to drive air blowing towards the plurality of shielding pieces to rotate the plurality of shielding pieces to define an air passage between each two adjacent shielding pieces of plurality of shielding pieces, and the air passage adapted to have air flowing therethrough.   
     
     
         2 . The fan assembly of  claim 1 , wherein a plurality of pivot shafts are pivotally mounted in the circular opening, each of the plurality of pivot shafts is located diagonally in the circular opening, the plurality of pivot shafts are parallel with each other, and each of the plurality of shielding pieces is secured to each of the plurality of pivot shafts. 
     
     
         3 . The fan assembly of  claim 2 , wherein each of the plurality of shielding pieces includes a securing portion and a free portion, and the securing portion is mounted on corresponding pivot shaft. 
     
     
         4 . The fan assembly of  claim 3 , wherein each of the plurality of shielding pieces includes a first side and a second side, the first side faces to the first vent opening, the second side faces to the fan, and between each two adjacent shielding pieces of plurality of shielding pieces, the second side face of the free portion of one shielding piece is located on the first face of the securing portion of the other shielding piece. 
     
     
         5 . The fan assembly of  claim 1 , wherein the fan comprises a side plate, an elastic piece is located on the side plate, a protrusion is formed on the elastic piece, the rack defines a mounting hole, and the elastic piece is adapted to be elastically bent by the rack to mount the protrusion in the mounting hole. 
     
     
         6 . The fan assembly of  claim 1 , wherein the rack defines a notch which is located above the first vent opening, the shield comprises a lock, the lock comprises a connection piece, a bent piece, and a handle, the connection piece is connected to the shield, the bent piece is perpendicularly connected to a top portion of the connection piece, the handle is perpendicularly connected to the bent piece, a tab is formed on a connection portion of the bent piece and the connection piece, the bent piece is adapted to be elastically bent by the rack to mount the tab in the notch, and the handle is adapted to be pulled to bent the bent piece to move the tab out of the notch. 
     
     
         7 . The fan assembly of  claim 1 , wherein the rack comprises a limiting piece which separates the shield from the fan. 
     
     
         8 . A fan assembly, comprising:
 a rack comprising a first side wall and a second side wall, the first side wall defining a first vent opening, the second side wall defining a second vent opening which is aligned to the first vent opening;   a fan mounted between the first side wall and the second side wall, the fan aligned to the second vent opening;   a shield mounted between the fan and the first side wall, the shield defining a circular opening aligned to the fan and the first vent opening, a plurality of shielding pieces pivotally mounted in the circular opening, opposite ends of each of the plurality of shielding piece arc-shaped, the plurality of shielding pieces together forming a circle to shield the circular opening by gravity;   wherein the fan is adapted to drive air blowing towards the plurality of shielding pieces to rotate the plurality of shielding pieces to uncover the shielding opening.   
     
     
         9 . The fan assembly of  claim 8 , wherein a plurality of pivot shafts are pivotally mounted in the circular opening, each of the plurality of pivot shafts is located diagonally in the circular opening, the plurality of pivot shafts are parallel with each other, and each of the plurality of shielding pieces is secured to each of the plurality of pivot shafts. 
     
     
         10 . The fan assembly of  claim 9 , wherein each of the plurality of shielding pieces includes a securing portion and a free portion, and the securing portion is mounted on corresponding pivot shaft. 
     
     
         11 . The fan assembly of  claim 10 , wherein each of the plurality of shielding pieces includes a first side and a second side, the first side faces to the first vent opening, the second side faces to the fan, and between each two adjacent shielding pieces of plurality of shielding pieces, the second side face of the free portion of one shielding piece is located on the first face of the securing portion of the other shielding piece. 
     
     
         12 . The fan assembly of  claim 8 , wherein the fan comprises a side plate, an elastic piece is located on the side plate, a protrusion is formed on the elastic piece, the rack defines a mounting hole, and the elastic piece is adapted to be elastically bent by the rack to mount the protrusion in the mounting hole. 
     
     
         13 . The fan assembly of  claim 8 , wherein the rack defines a notch which is located above the first vent opening, the shield comprises a lock, the lock comprises a connection piece, a bent piece, and a handle, the connection piece is connected to the shield, the bent piece is perpendicularly connected to a top portion of the connection piece, the handle is perpendicularly connected to the bent piece, a tab is formed on a connection portion of the bent piece and the connection piece, the bent piece is adapted to be elastically bent by the rack to mount the tab in the notch, and the handle is adapted to be pulled to bent the bent piece to move the tab out of the notch. 
     
     
         14 . The fan assembly of  claim 8 , wherein the rack comprises a limiting piece which separates the shield from the fan.