Fan modules and server equipment

Abstract

A fan module and server equipment are provided that can achieve a balance between increased airflow and noise reduction when an axial flow fan is mounted in the server equipment. The fan module for taking in and discharging air includes a stator located on an upstream side with respect to airflow and an axial flow fan located on the downstream side. When the fan module is viewed from the rotational-axial direction of the axial flow fan, if a leading edge of a rotor vane constituting part of the axial flow fan passes a trailing edge of a stator vane constituting part of the rotor, a skew is formed in which the leading edge of the rotor vane constantly intersects the leading edge of the rotor vane at a single point.

1 . A fan module for taking in and discharging air, comprising:
 a stator located on an upstream side with respect to airflow; and   an axial flow fan located on a downstream side with respect to the airflow;   wherein, when the fan module is viewed from a rotational-axial direction of the axial flow fan, the stator includes a stator vane trailing edge and the axial flow fan includes a rotor vane leading edge, the trailing edge and the leading edge each having two points of intersection with two concentric circles having different diameters, and   wherein a straight line connecting the two points of intersection on the trailing edge and a straight line connecting the two points of intersection on the leading edge are configured such that if, on one of the two concentric circles, one point of intersection on the trailing edge is superimposed on the point of intersection on the leading edge, on the other of the two concentric circles, the other point of intersection on the trailing edge is not coincident with the other point of intersection on the leading edge.   
     
     
         2 . The fan module according to  claim 1 ,
 wherein the rotor vane has a tilt direction opposite to that of the stator vane.   
     
     
         3 . The fan module according to  claim 1 ,
 wherein the stator vane constituting part of the stator is configured to be warped like a U-shape.   
     
     
         4 . The fan module according to  claim 3 ,
 wherein the stator vane applies a reverse pre-swirl to the rotor vane.   
     
     
         5 . The fan module according to  claim 1 ,
 wherein a second stator is disposed on the downstream side of the axial flow fan.   
     
     
         6 . The fan module according to  claim 5 ,
 wherein a trailing edge of a stator vane constituting part of the second stator disposed on the downstream side of the axial flow fan is located at a positive position with respect to a position of a leading edge of the stator vane in a rotational direction of the axial flow fan.   
     
     
         7 . The fan module according to  claim 1 ,
 wherein an interval between adjacent stator vanes constituting part of the stator is smaller than a width of a finger.   
     
     
         8 . The fan module according to  claim 1 ,
 wherein the axial flow fan and the stator constituting the fan module are integrated with each other.   
     
     
         9 . The fan module according to  claim 1 ,
 wherein a plurality of the fan modules are combined in series or in parallel.   
     
     
         10 . Server equipment in which the fan module according to  claim 1  is mounted.