Fan assembly

Abstract

A fan assembly includes a bracket, a fan and a cage. The bracket includes a ventilation plate. The fan is received in the bracket and secured to the ventilation plate. The cage is received in the bracket and secured to the fan. The cage defines an opening and includes a plurality of pieces rotatably received in the opening. The plurality of pieces cover the opening. The cage further includes a plurality of limiting pieces extending from an inner surface of the opening. The pressure of moving air from the fan is capable of rotating the plurality of pieces, but any over-rotation of the plurality of pieces is prevented by the plurality of limiting pieces.

1 . A fan assembly, comprising:
 a bracket comprising a ventilation plate;   a fan received in the bracket and secured to the ventilation plate; and   a cage received in the bracket and secured to the fan, and the fan being located between the ventilation plate and the cage; the cage defining an opening and comprising a plurality of pieces rotatably received in the opening;   wherein the plurality of pieces cover the opening; the cage further comprises a plurality of limiting pieces extending from an inner surface of the opening; the plurality of pieces are configured to be rotated by the fan, and the plurality of limiting pieces are configured to block the plurality of pieces when the plurality of pieces are rotated.   
     
     
         2 . The fan assembly of  claim 1 , wherein each of the plurality of limiting pieces is substantially perpendicular to the ventilation plate. 
     
     
         3 . The fan assembly of  claim 1 , wherein each of the plurality of pieces is substantially parallel to the ventilation plate. 
     
     
         4 . The fan assembly of  claim 1 , wherein the plurality of limiting pieces are further configured to block the plurality of pieces when of the plurality of pieces are substantially perpendicular to the ventilation plate. 
     
     
         5 . The fan assembly of  claim 1 , wherein the cage comprises a front wall, a top wall, a bottom wall, and two sidewalls; the two sidewalls are substantially parallel to each other, the front wall is substantially perpendicular to the top wall, the bottom wall and the two sidewalls, and the top wall is substantially parallel to the bottom wall; the plurality of limiting pieces are located on each of the two sidewalls; a plurality of shafts are rotatably mounted between the two sidewalls, and each of the plurality of pieces is secured to each of the plurality of shafts. 
     
     
         6 . The fan assembly of  claim 5 , wherein each of the plurality of pieces comprises a mounting portion, and a free portion connected to the mounting portion, and the mounting portion is secured to each of the plurality of shafts; each of the mounting portion and the free portion comprises a first side surface and a second side surface opposite to the first side surface; the second side surface of the free portion of one of the plurality of pieces abuts the first side surface of the mounting portion of an adjacent one of the plurality of pieces. 
     
     
         7 . The fan assembly of  claim 5 , wherein the cage further comprises two installation pieces and two blocking pieces, the top wall is connected to each of the two sidewalls by each of the two installation pieces and each of the two clocking pieces; each of the two installation pieces is substantially perpendicularly connected to the top wall, and each of the two blocking pieces is substantially perpendicularly connected to each of the two sidewalls and each of the two installation pieces; a piece is rotatably mounted between the two installation pieces, the piece being configured to be rotated by the fan and being blocked by one of the plurality of the limiting pieces when rotated. 
     
     
         8 . The fan assembly of  claim 7 , wherein a distance between the two installation pieces is smaller than a distance between the two sidewalls, and an area of the pieces is smaller than an area of each of the plurality of pieces. 
     
     
         9 . The fan assembly of  claim 7 , wherein cage comprises two securing pieces, and each of the two securing pieces is located in a corner defined by each of the two installation pieces and each of the two blocking pieces; each of the two securing pieces defines an installation hole, and installation hole is adapted to secure the fan. 
     
     
         10 . The fan assembly of  claim 1 , wherein the fan defines an air outlet, and a size of the air outlet is equal to a size of the opening. 
     
     
         11 . A fan assembly, comprising:
 a bracket comprising a ventilation plate;   a fan received in the bracket and secured to the ventilation plate; and   a cage received in the bracket and secured to the fan, and the fan being located between the ventilation plate and the cage; the cage comprising a front wall, a top wall, and a bottom wall; the top wall and the bottom wall are substantially perpendicular to the front wall, and a restricting piece extends from the front wall; the cage defining an opening and further comprising a plurality of pieces rotatably received in the opening;   wherein the plurality of pieces cover the opening; the cage further comprises a plurality of limiting pieces extending from an inner surface of the opening; the plurality of pieces are configured to be rotated by the fan, and the plurality of limiting pieces are configured to block the plurality of pieces when the plurality of pieces are rotated towards the top wall; and the plurality of pieces are rotatable towards the bottom wall and blocked by the restricting piece.   
     
     
         12 . The fan assembly of  claim 11 , wherein each of the plurality of limiting pieces is substantially perpendicular to the ventilation plate. 
     
     
         13 . The fan assembly of  claim 11 , wherein each of the plurality of limiting pieces is substantially parallel to the restricting piece. 
     
     
         14 . The fan assembly of  claim 11 , wherein the plurality of limiting pieces are further configured to block the plurality of pieces when of the plurality of pieces is substantially perpendicular to the ventilation plate, and the restricting is further configured to block the plurality of pieces when the plurality of pieces are substantially parallel to the ventilation plate. 
     
     
         15 . The fan assembly of  claim 11 , wherein the cage further comprises two sidewalls; the two sidewalls are substantially parallel to each other, and the front wall and the bottom wall are substantially perpendicular to the two sidewalls; the plurality of limiting pieces are located on each of the two sidewalls; a plurality of shafts are rotatably mounted between the two sidewalls, and each of the plurality of pieces is secured to each of the plurality of shafts. 
     
     
         16 . The fan assembly of  claim 15 , wherein each of the plurality of pieces comprises a mounting portion, and a free portion connected to the mounting portion, and the mounting portion is secured to each of the plurality of shafts; each of the mounting portion and the free portion comprises a first side surface and a second side surface opposite to the first side surface; the second side surface of the free portion of one of the plurality of pieces abuts the first side surface of the mounting portion of an adjacent one of the plurality of pieces. 
     
     
         17 . The fan assembly of  claim 15 , wherein the cage further comprises two installation pieces and two blocking pieces, the top wall id connected to each of the two sidewalls by each of the two installation pieces and each of the two clocking pieces; each of the two installation pieces is substantially perpendicularly connected to the top wall, and each of the two blocking pieces is substantially perpendicularly connected to each of the two sidewalls and each of the two installation pieces; a pieces is rotatably mounted between the two installation pieces, the piece being configured to be rotated by the fan and being blocked by one of the plurality of the limiting pieces when rotated. 
     
     
         18 . The fan assembly of  claim 17 , wherein a distance between the two installation pieces is smaller than a distance between the two sidewalls, and an area of the pieces is smaller than an area of each of the plurality of pieces. 
     
     
         19 . The fan assembly of  claim 17 , wherein the cage comprises two securing pieces, and each of the two securing pieces is located in a corner defined by each of the two installation pieces and each of the two blocking pieces; each of the two securing pieces defines an installation hole, and the installation hole is adapted to secure the fan. 
     
     
         20 . The fan assembly of  claim 11 , wherein the fan defines an air outlet, and a size of the air outlet is equal to a size of the opening.