Fan device

Abstract

A fan device includes a casing unit and a fan impeller unit mounted in the casing unit. The casing unit includes a casing body formed with a receiving space and an air outlet port, a porous plate formed with a plurality of through holes and is disposed in the receiving space to divide the receiving space into an air-flowing room and a noise-reduction room, and an air-entering tube in spatial communication with the air-flowing room. The fan impeller unit is disposed in the air-flowing room and rotatable to generate airflow partially flowing from the air-flowing room into the noise-reduction room through the through holes.

What is claimed is: 
     
         1 . A fan device comprising:
 a casing unit having an axis and including
 a casing body that is formed with a receiving space and an air outlet port in spatial communication with said receiving space, 
 a porous plate that is formed with a plurality of through holes and that is disposed in said receiving space to divide said receiving space into an air-flowing room and a noise-reduction room aligned with and spaced apart from each other along the axis, and 
 an air-entering tube that is connected to said casing body and that is in spatial communication with said air-flowing room; and 
   a fan impeller unit mounted in the casing unit, disposed in said air-flowing room of said receiving space, and being rotatable about the axis to generate airflow that partially flows from said air-flowing room into said noise-reduction room through said through holes of said porous plate.   
     
     
         2 . The fan device of  claim 1 , wherein said casing body of said casing unit includes abase and a cover connected to said base to cooperatively define said receiving space, said base cooperating with said porous plate to define said noise-reduction room, said cover cooperating with said porous plate to define said air-flowing room, said porous plate being further formed with an inner tube-communicating through hole spaced apart from said through holes, said air-entering tube peripherally and outwardly extending from and in spatial communication with said inner tube-communicating through hole. 
     
     
         3 . The fan device of  claim 2 , further comprising a sound-absorption member disposed in said noise-reduction room. 
     
     
         4 . The fan device of  claim 3 , wherein said sound-absorption member is porous. 
     
     
         5 . The fan device of  claim 3 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         6 . The fan device of  claim 2 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         7 . The fan device of  claim 1 , wherein said casing body of said casing unit includes abase and a cover connected to said base to cooperatively define said receiving space, said base cooperating with said porous plate to define said noise-reduction room, said cover cooperating with said porous plate to define said air-flowing room, said base including a bottom plate that is distal to said cover and that is formed with an outer tube-communicating through hole, said air-entering tube peripherally and outwardly extending from and in spatial communication with said outer tube-communicating through hole. 
     
     
         8 . The fan device of  claim 7 , further comprising a sound-absorption member disposed in said noise-reduction room. 
     
     
         9 . The fan device of  claim 8 , wherein said sound-absorption member is porous. 
     
     
         10 . The fan device of  claim 8 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         11 . The fan device of  claim 7 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         12 . The fan device of  claim 1 , wherein said casing body of said casing unit is further formed with an outer tube-communicating through hole in spatial communication with said receiving space, said outer tube-communicating through hole and said porous plate being located at two opposite sides of said fan impeller unit along the axis, said air-entering tube peripherally and outwardly extending from and in spatial communication with said outer tube-communicating through hole. 
     
     
         13 . The fan device of  claim 12 , further comprising a sound-absorption member disposed in said noise-reduction room. 
     
     
         14 . The fan device of  claim 13 , wherein said sound-absorption member is porous. 
     
     
         15 . The fan device of  claim 13 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         16 . The fan device of  claim 12 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         17 . The fan device of  claim 1 , further comprising a sound-absorption member disposed in said noise-reduction room. 
     
     
         18 . The fan device of  claim 17 , wherein said sound-absorption member is porous. 
     
     
         19 . The fan device of  claim 17 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body. 
     
     
         20 . The fan device of  claim 1 , wherein said casing unit further includes an air guiding member disposed at said air outlet port of said casing body and in spatial communication with said receiving space of said casing body.