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Fan modules and server equipment

Inactive Publication Date: 2013-02-28
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a fan module and server equipment that can increase airflow while reducing noise from an axial flow fan. This means that the fan module can achieve a balance between increased airflow and noise reduction in the axial flow fan mounted in server equipment.

Problems solved by technology

In addition, since the conventional technology premises the series configuration of the two axial flow fans, there is a problem in that the conventional technology cannot be applied to information instruments that do not meet such a premise.

Method used

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  • Fan modules and server equipment
  • Fan modules and server equipment
  • Fan modules and server equipment

Examples

Experimental program
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first embodiment

[0046]A first embodiment is described with reference to FIGS. 4, 5 and 6. FIG. 4 is an explanatory view showing a state of airflow entering the axial flow fan exposed to the atmosphere. FIG. 5 is an explanatory view showing a state of airflow entering the axial flow fan mounted in an information instrument. FIG. 6 is a graph showing a comparison in velocity distribution of airflow entering the axial flow fan between when the axial flow fan is exposed to the atmosphere and when it is mounted in the information instrument.

[0047]In cooling a variety of information instruments, resistor bodies such as boards which disturb airflow are generally located on the upstream side of a cooling fan. If the airflow thus disturbed by these resistor bodies enters the cooling fan mounted in an information instrument, noises are generated. As shown in FIG. 4, general-purpose small-sized axial flow fans are presupposed to be used under atmosphere-exposure conditions; therefore, they are designed under ...

second embodiment

[0050]As shown in FIG. 1, the fan module 1 has the stator 2 disposed immediately in front of the axial flow fan 3. The rotor vanes 32 are rotated along with the rotation of the boss 31 to which the motor of the axial flow fan 3 is attached. The rotation of the rotor vanes 32 causes interference with the stator vanes 22 of the stator. Thus, there is concern about increased noise of frequencies resulting from the number of the rotor vanes 32 or of the stator vanes 22.

[0051]To address the concern noise, a second embodiment focuses on a positional relationship between the stator vanes 22 and the rotor vanes 32. This suppresses increase in the noise of frequencies resulting from the number of the rotor vanes 32 or the stator vanes 22.

[0052]FIG. 7 partially shows the fan module 1 as viewed from the upstream side of airflow in the rotational-axial direction of the rotor vanes 32. As described earlier, the interference between the rotor vanes 32 and the stator vanes 22 occurs when the rotor...

third embodiment

[0057]In a third embodiment, a configuration in which the direction of airflow is changed by stator vanes is added to that of the first or second embodiment to thereby increase the amount of airflow in a fan module mounted in server equipment such as an information instrument. FIG. 9 is a schematic cross-sectional view of a fan module of the third embodiment, showing a positional relationship between a stator vane 22 and a rotor vane 32. The stator vane 22 of a stator and the rotor vane 32 of an axial flow fan are arranged from the upstream side of airflow. The rotor vane 32 is rotated in a rotational direction R. The stator vane 22 is warped in a U-shape in cross-section relative to the rotational direction R.

[0058]A velocity component 51 of airflow entering the fan module is changed in direction by the stator vane 22 and turned to a velocity component 52 of the airflow, which enters the rotor vane 32. In other words, because of the presence of the stator vane 22, the airflow havin...

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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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to fan modules and server equipment. The invention more particularly relates to a fan module formed by combining an axial flow fan with a stator, and server equipment which is an information instrument in which the fan module is mounted.[0003]2. Description of the Related Art[0004]Office automation equipment, IT devices and home electric appliances include therein a cooling fan for cooling electronic components from which heat is emitted. In recent years, these home electric appliances, office automation equipment and home electric appliances have increasingly been downsized and sophisticated in the market. Electronic components in the internal structure of the equipment or the like are increased in density along with the downsizing and sophistication. Thus, the amount of heat generation across the electronic components tends to increase.[0005]To address the increase in the heat g...

Claims

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Application Information

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IPC IPC(8): F04D29/54
CPCF04D19/007F04D29/665F04D29/541F04D29/384
Inventor UCHIYAMA, YUSUKEIWASE, TAKUTSUBAKI, SHIGEYASUGOTO, AKIRA
Owner HITACHI LTD
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