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 frame opening corresponding to the first vent opening. A plurality of shielding pieces are pivotally mounted in the frame opening and adapted to use gravity to shield the frame opening. The fan is mounted in the rack and aligned with the second vent opening and the shield. The fan generates air flows flowing through air passages between each adjacent two of the plurality of shielding pieces, and that the plurality of shielding pieces are rotated by the air flows.

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 frame opening corresponding to the first vent opening, a plurality of shielding pieces pivotally mounted in the frame opening and adapted to shield the frame opening by gravity; and   a fan mounted in the rack and aligned to the second vent opening and the shield; the fan is configured to generate air flows flowing through air passages between each adjacent two of the plurality of shielding pieces, and that the plurality of shielding pieces are rotated by the air flows.   
     
     
         2 . The fan assembly of  claim 1 , wherein a plurality of pivot shafts are pivotally mounted in the frame opening, the plurality of pivot shafts are parallel with each other and aligned in a vertical direction, 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 comprises a securing portion and a free portion, and the securing portion is mounted on corresponding one of the plurality of pivot shafts. 
     
     
         4 . The fan assembly of  claim 3 , wherein each of the plurality of shielding pieces comprises a first side and a second side, the first side faces the first vent opening, the second side faces the fan; and between each adjacent two shielding pieces, a second side face of the free portion of one of the two shielding pieces is located on a first face of the securing portion of another one of the two shielding pieces. 
     
     
         5 . The fan assembly of  claim 1 , wherein an edge of the frame opening forms a blocking bar corresponding to each of the plurality of shielding pieces, and each of the plurality of shielding pieces is configured to rotate until each of the plurality of shielding pieces abuts the blocking bar. 
     
     
         6 . 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 configure to be elastically bent by the rack such that the protrusion is mounted in the mounting hole. 
     
     
         7 . The fan assembly of  claim 1 , wherein the rack defines a notch 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 between the bent piece and the connection piece, the bent piece is configured to be elastically bent by the rack such that the tab is mounted in the notch, and the handle is configured to be pulled to bent the bent piece and to move the tab out of the notch. 
     
     
         8 . The fan assembly of  claim 1 , wherein the rack comprises a limiting piece separating the shield from the fan. 
     
     
         9 . 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 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 frame opening aligned to the fan and the first vent opening, a plurality of shielding pieces pivotally mounted in the frame opening and configured to cover the frame opening;   wherein the fan is configured to blow air towards the plurality of shielding pieces such that the plurality of shielding pieces are rotated to uncover the frame opening.   
     
     
         10 . The fan assembly of  claim 9 , wherein a plurality of pivot shafts are pivotally mounted in the frame opening, the plurality of pivot shafts are parallel with each other and aligned in a vertical direction, and each of the plurality of shielding pieces is secured to each of the plurality of pivot shafts. 
     
     
         11 . The fan assembly of  claim 10 , wherein each of the plurality of shielding pieces comprises a securing portion and a free portion, and the securing portion is mounted on corresponding one of the plurality of pivot shafts. 
     
     
         12 . The fan assembly of  claim 11 , wherein each of the plurality of shielding pieces comprises a first side and a second side, the first side faces the first vent opening, the second side faces the fan; and between each adjacent two shielding pieces, a second side face of the free portion of one of the two shielding pieces is located on a first face of the securing portion of another one of the two shielding pieces. 
     
     
         13 . The fan assembly of  claim 9 , wherein an edge of the frame opening forms a blocking bar corresponding to each of the plurality of shielding pieces, and each of the plurality of shielding pieces is configured to rotate until each of the plurality of shielding pieces abuts the blocking bar. 
     
     
         14 . The fan assembly of  claim 9 , 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 configured to be elastically bent by the rack such that the protrusion is mounted in the mounting hole. 
     
     
         15 . The fan assembly of  claim 9 , wherein the rack defines a notch 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 between the bent piece and the connection piece, the bent piece is configured to be elastically bent by the rack such that the tab is mounted in the notch, and the handle is configured to be pulled to bent the bent piece and to move the tab out of the notch. 
     
     
         16 . The fan assembly of  claim 9 , wherein the rack comprises a limiting piece separating the shield from the fan.