Serial Fan Device

Abstract

a serial fan device including two fans linked serially is provided. Each of the two fans has a housing, a driving member and a fan wheel, the housing has an outer frame and a base, the outer frame has two openings and a guiding channel linking the two openings, the driving member is disposed on the base, and the fan wheel is rotatably coupled with the driving member. At least one of the two fans has a positioning rim on the outer frame for the base to couple therewith, and a radial buffer gap is formed between an outer periphery of the base and an inner periphery of the positioning rim. Accordingly, the radial buffer gap can largely reduce the vibration transmitted from the base to the outer frame.

What is claimed is: 
     
         1 . A serial fan device comprising:
 two fans linked serially, wherein each of the two fans has a housing, a driving member and a fan wheel, wherein the housing has an outer frame and a base, wherein the outer frame has two openings and a guiding channel linking the two openings, wherein the driving member is disposed on the base, and wherein the fan wheel is rotatably coupled with the driving member,   wherein at least one of the two fans has a positioning rim on the outer frame for the base to couple therewith, 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.   
     
     
         2 . The serial fan device 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 serial fan device as claimed in  claim 2 , wherein the positioning rim has an axial shoulder abutting against the base. 
     
     
         4 . The serial fan device as claimed in  claim 3 , wherein the outer frame of the fan having the radial buffer gap 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. 
     
     
         5 . The serial fan device as claimed in  claim 3 , wherein the outer frame of the fan having the radial buffer gap 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. 
     
     
         6 . The serial fan device as claimed in  claim 3 , wherein the outer frame of the fan having the radial buffer gap 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 and a radial edge spaced from the inner periphery of the positioning rim by the radial buffer gap. 
     
     
         7 . The serial fan device as claimed in  claim 3 , wherein the two fans are a first fan and a second fan, wherein the base of the first fan is spaced from the inner periphery of the positioning rim of the first fan by the radial buffer gap, and wherein the base of the second fan is spaced from the inner periphery of the positioning rim of the second fan by the radial buffer gap. 
     
     
         8 . The serial fan device as claimed in  claim 7 , wherein the bases of the first and second fans are axially clamped by and between the axial shoulders of the first and second fans. 
     
     
         9 . The serial fan device n as claimed in  claim 7 , wherein the first and second fans are coupled with each other by a fixing assembly. 
     
     
         10 . The serial fan device as claimed in  claim 9 , wherein the fixing assembly includes a first hook member arranged on the first fan and a second hook member arranged on the second fan, and wherein the first and second hook members are capable of detachably engaging with each other. 
     
     
         11 . The serial fan device as claimed in  claim 1 , further comprising a damping member inserted between the two fans. 
     
     
         12 . The serial fan device as claimed in  claim 7 , further comprising a damping member inserted between the first and second fans. 
     
     
         13 . The serial fan device as claimed in  claim 12 , wherein each of the bases of the first and second fans has a recess for the damping member to be received in a space jointly formed by the recesses and between the bases of the first fan and the second fan. 
     
     
         14 . The serial fan device as claimed in  claim 12 , wherein the damping member includes an annular flange on a periphery thereof, and the annular flange is clamped by lateral walls of the seats of the two fans. 
     
     
         15 . The serial fan device as claimed in  claim 1 , wherein an edge of one of the two openings has an engaging notch, the said opening having the engaging notch has the positioning rim for the base to couple therewith, and the base has an engaging protrusion corresponding to and able to insert into the engaging notch. 
     
     
         16 . The serial fan device as claimed in  claim 15 , wherein lateral walls of the engaging notch form two opposite limiting flanges respectively, wherein two guiding flanges are formed on two opposite lateral walls of the engaging protrusion, and the engaging protrusion rests inside the engaging notch, and with the two limiting flanges engaging with the two guiding flanges respectively. 
     
     
         17 . The serial fan device as claimed in  claim 1 , wherein the positioning rim of the outer frame has a connecting groove, and the base has an elastic hook corresponding to and able to insert into the connecting groove. 
     
     
         18 . The serial fan device as claimed in  claim 4 , wherein the coupling member is a ring. 
     
     
         19 . The serial fan device as claimed in  claim 5 , wherein the coupling member is a ring.