Fluid driving device

Abstract

A fluid driving device includes a housing, a sleeve member, a bearing unit, a shaft member, a rotor, a fastener member and a screw. The housing has an accommodation space, an inlet passage unit spatially communicating with the accommodation space and an external environment, and an outlet passage unit spatially communicating with the accommodation space and the external environment. The sleeve member includes a tubular sleeve wall, and a drainage hole set formed through the tubular sleeve wall and spatially communicating with the inlet passage unit. The drainage hole set has a plurality of drainage holes arranged about an axis, and respectively extending along a plurality of central lines. The bearing unit is disposed in the sleeve member. The shaft member includes a driven segment and a support segment. The rotor is secured to the driven segment and includes a plurality of blades.

What is claimed is: 
     
         1 . A fluid driving device, comprising:
 a housing extending along an axis, and having a tubular housing wall that defines an accommodation space, an inlet passage unit that spatially communicates with said accommodation space and an external environment, and an outlet passage unit that spatially communicates with said accommodation space and the external environment;   a sleeve member disposed in said accommodation space, and including a tubular sleeve wall that defines an internal space, and a drainage hole set that is formed through said tubular sleeve wall and that spatially communicates with said inlet passage unit, said drainage hole set having a plurality of drainage holes that are spaced apart from each other, that are arranged about the axis, and that respectively extend along a plurality of central lines, said outlet passage unit being located outside said sleeve member;   a bearing unit disposed in said internal space of said sleeve member;   a shaft member extending along the axis, disposed in said internal space of said sleeve member, and including a driven segment that is adjacent to said drainage hole set, and a support segment that is connected to said driven segment along the axis and that is supported by said bearing unit;   a rotor secured to said driven segment of said shaft member, located at one side of said bearing unit along the axis, and including a plurality of blades that are surrounded by said drainage hole set and said outlet passage unit, said rotor being rotatable, said plurality of blades taking turns intersecting at least one of the plurality of central lines of said plurality of drainage holes when said rotor rotates;   a fastener member disposed in said shaft member; and   a screw securing said fastener member to said shaft member ( 40 ).   
     
     
         2 . The fluid driving device as claimed in  claim 1 , wherein
 said housing includes a tube portion, and a body portion that is connected to said tube portion along the axis, said tube portion including said tubular housing wall and further including an end wall that is connected to said tubular housing wall, said tubular housing wall and said end wall cooperatively defining said accommodation space, said body portion being connected to said end wall of said tube portion, and   said inlet passage unit has an introduction segment that extends along the axis and that is formed in said body portion, a plurality of transmission segments that are formed in said end wall and that spatially communicate with said introduction segment, and a plurality of output segments that are formed in said tubular housing wall and that spatially communicate with said drainage holes.   
     
     
         3 . The fluid driving device as claimed in  claim 2 , wherein said plurality of transmission segments of said housing are arranged radially around the axis, each of said plurality of output segments having a communication hole that spatially communicates with a corresponding one of said plurality of transmission segments, said inlet passage unit further having a plurality of storage grooves that respectively and spatially communicate with said plurality of output segments and that spatially communicate with said accommodation space, each of said plurality of storage grooves having a cross section that is perpendicular to the axis and that is greater than a cross section of the respective one of said plurality of output segments perpendicular to the axis. 
     
     
         4 . The fluid driving device as claimed in  claim 3 , wherein
 said tubular housing wall of said housing has an internal wall surface that is adjacent to said accommodation space, said accommodation space having a first end portion that is adjacent to said end wall and a second end portion that is located at one side of said first end portion opposite to said end wall along the axis, and   said outlet passage unit has a plurality of output guiding grooves that are recessed from said internal wall surface and that are spaced apart from each other around the axis, and a plurality of straight groove segments that extend respectively from said plurality of output guiding grooves towards said second end portion, each of said output guiding grooves having a cross section that is perpendicular to the axis and that is greater than a cross section of the respective one of said plurality of straight groove segments perpendicular to the axis.   
     
     
         5 . The fluid driving device as claimed in  claim 4 , further comprising a cover connected to said tubular housing wall, closing said second end portion of said accommodation space, and having a plurality of outlet holes that spatially communicate with said plurality of straight groove segments of said outlet passage unit. 
     
     
         6 . The fluid driving device as claimed in  claim 4 , wherein said end wall of said housing has a recess hole that spatially communicates with said accommodation space and said internal space, said recess hole being adjacent to said rotor, said plurality of output guiding grooves of said outlet passage unit spatially communicating with said recess hole. 
     
     
         7 . The fluid driving device as claimed in  claim 1 , wherein said tubular sleeve wall of said sleeve member has an inner wall surface that is adjacent to said internal space, and a block ring that protrudes from said inner wall surface, said internal space having a first side portion and a second side portion that are located at two opposite sides of said block ring along the axis, said first side portion spatially communicating with said drainage hole set, said bearing unit including a first bearing that is disposed in said first side portion and between said block ring and said rotor, and at least one second bearing that is disposed in said second side portion. 
     
     
         8 . The fluid driving device as claimed in  claim 7 , wherein said rotor further includes a hub that extends along the axis and that is connected to said blades, and a disc member that is connected to said blades and said hub and that is adjacent to said first bearing, said disc member being perpendicular to the axis, said hub having a threaded hole that is configured to be a reverse-threaded hole, the axis extending through said threaded hole, said driven segment of said shaft member having an external thread that is configured to be a reverse thread, said driven segment threadedly engaging said rotor.