Cooling device

Abstract

A cooling device is provided which is easy to assemble and provides improved cooling efficiency by preventing a back flow without fail. To this end, the cooling device has: (a) an axial fan having a plurality of vanes; (b) a power source for driving the axial fan; (c) a tubular fan ring disposed in outer edge portions of the vanes; (d) a projecting portion that extends over substantially entire circumference of the fan ring and projects in an outer peripheral direction; (e) a shroud disposed between the axial fan and an object to be cooled; and (f) an adjusting plate that is fixedly attached to the shroud so as to make a distance from an outer circumferential surface of the fan ring variable and circumferentially divided into a plurality of parts.

1 . A cooling device comprising: 
 (a) an axial fan having a plurality of vanes;    (b) a power source for driving the axial fan;    (c) a tubular fan ring disposed in outer edge portions of the vanes;    (d) a projecting portion that extends over substantially entire circumference of the fan ring and projects in an outer peripheral direction;    (e) a shroud disposed between the axial fan and an object to be cooled; and    (f) an adjusting plate that is fixedly attached to the shroud so as to make a distance from an outer circumferential surface of the fan ring variable and circumferentially divided into a plurality of parts.    
   
   
       2 . The cooling device according to  claim 1 , wherein the adjusting plate has an L-shaped section.  
   
   
       3 . The cooling device according to  claim 1 , wherein the adjusting plate has a T-shaped section.  
   
   
       4 . The cooling device according to  claim 1 , wherein the number of said projecting portions is at least two and an inner circumferential portion of the adjusting plate is positioned between any two of the projecting portions with respect to an axial direction of the axial fan.  
   
   
       5 . The cooling device according to  claim 4 , wherein the adjusting plate is disposed so as to overlap the projecting portions of the fan ring when viewed in a front view of the axial fan.  
   
   
       6 . The cooling device according to  claim 1 , wherein an inner circumferential portion of the adjusting plate is bifurcated and the projecting portion is located within intermediate space of the bifurcated portion.  
   
   
       7 . The cooling device according to  claim 6 , wherein the adjusting plate is disposed so as to overlap the projecting portion of the fan ring when viewed in a front view of the axial fan.  
   
   
       8 . The cooling device according to  claim 2 , wherein the number of said projecting portions is at least two and an inner circumferential portion of the adjusting plate is positioned between any two of the projecting portions with respect to an axial direction of the axial fan.  
   
   
       9 . The cooling device according to  claim 8 , wherein the adjusting plate is disposed so as to overlap the projecting portions of the fan ring when viewed in a front view of the axial fan.  
   
   
       10 . The cooling device according to  claim 3 , wherein the number of said projecting portions is at least two and an inner circumferential portion of the adjusting plate is positioned between any two of the projecting portions with respect to an axial direction of the axial fan.  
   
   
       11 . The cooling device according to  claim 10 , wherein the adjusting plate is disposed so as to overlap the projecting portions of the fan ring when viewed in a front view of the axial fan.