Low Vibration Fan

Abstract

A low vibration fan including a housing, a driving member and a fan wheel is provided. The housing has an outer frame and a base, wherein the outer frame has two openings, a positioning rim, and a guiding channel linking the two openings, wherein the base couples with the positioning rim, and wherein a radial buffer gap is formed between an outer periphery of the base and an inner periphery of the positioning rim. The driving member is mounted on the base. The fan wheel couples with the driving member rotatably. Accordingly, the radial buffer gap can largely reduce the vibration transmitted from the base to the outer frame.

What is claimed is: 
     
         1 . A low vibration fan, comprising:
 a housing having an outer frame and a base, wherein the outer frame has two openings, a positioning rim, and a guiding channel linking the two openings, wherein the base couples with the positioning rim, wherein the positioning rim of the outer frame has a minimal inner diameter, and wherein the base has a maximal outer diameter smaller than or equal to the minimal inner diameter;   a driving member mounted on the base; and   a fan wheel rotatably coupled with the driving member.   
     
     
         2 . The low vibration fan as claimed in  claim 1 , wherein a radial buffer gap is formed between an outer periphery of the base and an inner periphery of the positioning rim. 
     
     
         3 . The low vibration fan as claimed in  claim 2 , wherein the positioning rim has an axial shoulder for the base to abut against. 
     
     
         4 . The low vibration fan as claimed in  claim 3 , wherein the base abuts against the axial shoulder via a buffering pad. 
     
     
         5 . The low vibration fan as claimed in  claim 3 , wherein the outer frame of the fan is a hollow body, wherein the positioning rim is formed on an end section of the guiding channel defining one of the two openings, wherein the base of the housing includes a seat, a plurality of connecters and a coupling member, wherein the plurality of connecters connects with the seat by one end and the coupling member by another end, wherein the base couples with the positioning rim by the coupling member, wherein the coupling member abuts against the axial shoulder, and wherein an outer periphery of the coupling member is spaced from the inner periphery of the positioning rim by the radial buffer gap. 
     
     
         6 . The low vibration fan as claimed in  claim 3 , wherein the outer frame of the housing has a hollow body, a plurality of connecters and a coupling member, wherein the plurality of connecters connects with an inner periphery of the hollow body by one end and the coupling member by another end, wherein the base is a seat, wherein the positioning rim is formed on an end of the coupling member, wherein the axial shoulder is arranged on the inner periphery of the positioning rim, wherein the base couples with the positioning rim and abuts against the axial shoulder, and wherein the outer periphery of the base is spaced from the inner periphery of the positioning rim by the radial buffer gap. 
     
     
         7 . The low vibration fan as claimed in  claim 3 , wherein the outer frame of the housing is a hollow body, wherein the positioning rim is formed on an end section of the guiding channel defining one of the two openings, wherein the base of the housing includes a seat and a plurality of connecters, wherein the plurality of connecters connects with the seat by one end and the positioning rim by another end, wherein each end of the connecters connecting with the positioning rim has an axial edge abutting against the axial shoulder formed on the inner periphery of the positioning rim, as well as a radial edge spaced from the inner periphery of the positioning rim by the radial buffer gap. 
     
     
         8 . The low vibration fan as claimed in  claim 3 , wherein the base is coupled with the axial shoulder by adhesive. 
     
     
         9 . The low vibration fan as claimed in  claim 3 , further comprising a plurality of limiting flanges inwardly extending from the outer frame, wherein the base is axially engaged between the limiting flanges and the axial shoulder. 
     
     
         10 . The low vibration fan as claimed in  claim 3 , further comprising a plurality of fixing holes in the outer frame and a pressing member having a plurality of through holes in alignment with the fixing holes, wherein a plurality of fixing member passes through the plurality of through holes and fixes to inner surfaces of the plurality of fixing holes, and wherein the base is axially sandwiched between the pressing member and the axial shoulder. 
     
     
         11 . The low vibration fan as claimed in  claim 5 , wherein the coupling member is a ring. 
     
     
         12 . The low vibration fan as claimed in  claim 6 , wherein the coupling member is a ring. 
     
     
         13 . The low vibration fan as claimed in  claim 1 , wherein an edge of one of the two openings has a plurality of engaging notches and the base has a plurality of engaging protrusions corresponding to and able to insert into the engaging notches. 
     
     
         14 . The low vibration fan as claimed in  claim 1 , wherein the positioning rim of the outer frame has a plurality of connecting grooves and the base has a plurality of elastic hooks corresponding to and inserted in the plurality of connecting grooves.