Heat-dissipation fan

Abstract

A heat-dissipation fan includes a first plate, a second plate, a ring wall, a spacing rib, a stator and a fan wheel. The first plate comprises a vent, and an accommodating space can be defined by the first plate, the second plate and the ring wall. The spacing rib is disposed at the accommodating space. A passage is formed between the spacing rib and the ring wall, and an end portion of the spacing rib and the ring wall are spaced apart to form an opening. The passage is in communication with the vent, and the opening is in communication with the passage and the accommodating space. The fan wheel can be driven by the stator, and the dust adhered to the accommodating space may be discharged through the opening, the passage and the vent via airflow generated by rotating fan wheel.

1 . A heat-dissipation fan comprising:
 a first plate having a first top surface, a first bottom surface, a first aperture and a vent;   a second plate having a second top surface, a second bottom surface and a second aperture;   a ring wall having an inner surface, an outer surface and a first opening, wherein the ring wall is disposed between the first plate and the second plate, and an accommodating space can be defined by the first plate, the second plate and the ring wall;   a spacing rib disposed at the accommodating space, wherein a passage is formed between the ring wall and the spacing rib, the spacing rib comprises a first end portion and a second end portion, the second end portion and the ring wall are spaced apart to form a second opening, the passage is in communication with the vent, and the second opening is in communication with the passage and the accommodating space;   a stator disposed at the accommodating space;   a circuit board having a forward/reverse control unit, wherein the circuit board is electrically connected with the stator; and   a fan wheel coupled to the stator, wherein the fan wheel comprises a hub and a plurality of blades, the rotation direction of the fan wheel is controllable by the forward/reverse control unit.   
     
     
         2 . The heat-dissipation fan in accordance with  claim 1 , wherein the first end portion of the spacing rib is in contact with the inner surface of the ring wall. 
     
     
         3 . The heat-dissipation fan in accordance with  claim 2 , wherein the first end portion of the spacing rib is formed as one piece with the inner surface. 
     
     
         4 . The heat-dissipation fan in accordance with  claim 1 , wherein the first end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a first spacing, the second end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a second spacing, and the second spacing is larger than the first spacing. 
     
     
         5 . The heat-dissipation fan in accordance with  claim 4 , wherein the first spacing has a first width, the second spacing has a second width, and the passage between the spacing rib and the inner surface of the ring wall is tapered from the second width to the first width. 
     
     
         6 . The heat-dissipation fan in accordance with  claim 5 , wherein the spacing rib can be an arc-shaped plate. 
     
     
         7 . The heat-dissipation fan in accordance with  claim 2 , wherein the spacing rib is formed as one piece with the first top surface of the first plate. 
     
     
         8 . The heat-dissipation fan in accordance with  claim 2 , wherein the spacing rib is formed as one piece with the second bottom surface of the second plate. 
     
     
         9 . The heat-dissipation fan in accordance with  claim 2  further includes an active spacing rib disposed at the second opening. 
     
     
         10 . The heat-dissipation fan in accordance with  claim 9 , wherein the active spacing rib comprises a pivoted portion and a swing portion in connection with the pivoted portion, the pivoted portion is pivotally connected with the first top surface of the first plate. 
     
     
         11 . The heat-dissipation fan in accordance with  claim 10 , wherein the pivoted portion is pivotally connected with the second bottom surface of the second plate. 
     
     
         12 . The heat-dissipation fan in accordance with  claim 9  further includes a pillar disposed between the active spacing rib and the blades of the fan wheel. 
     
     
         13 . The heat-dissipation fan in accordance with  claim 12 , wherein the pillar is formed as one piece with the first top surface of the first plate. 
     
     
         14 . The heat-dissipation fan in accordance with  claim 12 , wherein the pillar is formed as one piece with the second bottom surface of the second plate. 
     
     
         15 . The heat-dissipation fan in accordance with  claim 9  further includes a resilient member, wherein the resilient member comprises a first end and a second end, the first end is fixed at the spacing rib, and the second end is fixed at the active spacing rib. 
     
     
         16 . A heat-dissipation fan comprising:
 a first plate having a first top surface and a first bottom surface;   a second plate having a second top surface and a second bottom surface;   a ring wall having an inner surface, an outer surface and a first opening, wherein the ring wall is disposed between the first plate and the second plate, and an accommodating space can be defined by the first plate, the second plate and the ring wall;   a spacing rib disposed at the accommodating space, wherein a passage is formed between the ring wall and the spacing rib, the spacing rib comprises a first end portion and a second end portion, the second end portion and the ring wall are spaced apart to form a second opening, the passage comprises a vent in communication with an edge of the first plate, the second opening is in communication with the passage and the accommodating space;   a stator disposed at the accommodating space;   a circuit board having a forward/reverse control unit, wherein the circuit board is electrically connected with the stator; and   a fan wheel coupled to the stator, wherein the fan wheel comprises a hub and a plurality of blades, the rotation direction of the fan wheel is controllable by the forward/reverse control unit.   
     
     
         17 . The heat-dissipation fan in accordance with  claim 16 , wherein the first end portion of the spacing rib is in contact with the inner surface of the ring wall. 
     
     
         18 . The heat-dissipation fan in accordance with  claim 17 , wherein the first end portion of the spacing rib is formed as one piece with the inner surface. 
     
     
         19 . The heat-dissipation fan in accordance with  claim 16 , wherein the first end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a first spacing, the second end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a second spacing, and the second spacing is larger than the first spacing. 
     
     
         20 . The heat-dissipation fan in accordance with  claim 19 , wherein the first spacing has a first width, the second spacing has a second width, and the passage between the spacing rib and the inner surface of the ring wall is tapered from the second width to the first width. 
     
     
         21 . The heat-dissipation fan in accordance with  claim 17  further includes an active spacing rib disposed at the second opening, and the active spacing rib comprises a pivoted portion and a swing portion in connection with the pivoted portion. 
     
     
         22 . A heat-dissipation fan comprising:
 a plate having a top surface, a bottom surface and a vent;   a ring wall having an inner surface, an outer surface and a first opening, wherein the ring wall is disposed at the plate, and an accommodating space can be defined by the plate and the ring wall;   a spacing rib disposed at the accommodating space, wherein a passage is formed between the ring wall and the spacing rib, the spacing rib comprises a first end portion and a second end portion, the second end portion and the ring wall are spaced apart to form a second opening, the passage is in communication with the vent, the second opening is in communication with the passage and the accommodating space;   a stator disposed at the accommodating space;   a circuit board electrically connected with the stator; and   a fan wheel coupled to the stator, wherein the fan wheel comprises a hub and a plurality of blades, the rotation direction of the fan wheel is controllable by the circuit board.   
     
     
         23 . The heat-dissipation fan in accordance with  claim 22 , wherein the first end portion of the spacing rib is in contact with the inner surface of the ring wall. 
     
     
         24 . The heat-dissipation fan in accordance with  claim 23 , wherein the first end portion of the spacing rib is formed as one piece with the inner surface. 
     
     
         25 . The heat-dissipation fan in accordance with  claim 22 , wherein the first end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a first spacing, the second end portion of the spacing rib and the inner surface of the ring wall are spaced apart by a second spacing, and the second spacing is larger than the first spacing. 
     
     
         26 . The heat-dissipation fan in accordance with  claim 25 , wherein the first spacing has a first width, the second spacing has a second width, and the passage between the spacing rib and the inner surface of the ring wall is tapered from the second width to the first width. 
     
     
         27 . The heat-dissipation fan in accordance with  claim 26 , wherein the spacing rib can be an arc-shaped plate. 
     
     
         28 . The heat-dissipation fan in accordance with  claim 23 , wherein the spacing rib is formed as one piece with the first top surface of the first plate. 
     
     
         29 . The heat-dissipation fan in accordance with  claim 23 , wherein the spacing rib is formed as one piece with the second bottom surface of the second plate.