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Fan

A fan and sleeve technology, applied in the field of fans that generate air flow, can solve the problems of large fan vibration, disk drive device reading and writing errors, impact, etc., to achieve the effect of reducing vibration

Active Publication Date: 2013-01-02
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the high-speed rotation of the cooling fan, the fan generates large vibrations, which affects other devices in the electronic equipment.
For example, reading and writing errors of the disk drive due to the vibration of the cooling fan

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0022] In this specification, the direction of the central axis of the motor will be figure 1 The upper side is simply referred to as "upper side", and the lower side is simply referred to as "lower side". In addition, the up-down direction does not indicate the positional relationship or direction when assembled in an actual device. In addition, the direction parallel to the central axis is referred to as "axial direction", the radial direction centered on the central axis is simply referred to as "radial direction", and the circumferential direction centered on the central axis is simply referred to as "circumferential direction".

[0023] figure 1 It is a cross-sectional view of the axial fan 1 according to the embodiment of the present invention. Hereinafter, the axial flow fan 1 is simply referred to as "fan 1". The fan 1 includes a motor 11 , an impeller 12 , a casing 13 , a plurality of support ribs 14 , and a base 15 . The casing 13 surrounds the outer periphery of...

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PUM

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Abstract

A fan includes a motor and an impeller. The motor includes a stationary portion and a rotating portion. The stationary portion includes a stator and a bearing portion. The bearing portion includes a sleeve made of a metal sintering body and a bearing housing covering the outer periphery of the sleeve. The rotating portion includes a rotor magnet, a shaft inserted in the sleeve, and a thrust plate extending from the lower end of the shaft to the radial external side. A radial gap between the inner periphery of the sleeve and the outer periphery of the shaft includes a radial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure acting axially downward on a lubricating oil, while an axial gap between the lower surface of the sleeve and the upper surface of the thrust plate includes an axial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure acting radially inward on the lubricating oil. A circulation hole extending in an axial direction is defined between the bearing housing and the sleeve. The radial gap is arranged to have a radial width in a range of about 5 [mu]m to about 20 [mu]m.

Description

technical field [0001] The invention relates to a fan for generating air flow. Background technique [0002] Conventionally, cooling fans for cooling electronic components are installed inside casings of various electronic devices. The motor part of the axial flow fan disclosed in Japanese Laid-Open Publication No. 2009-213225 includes a base part, an armature, a substantially cylindrical bearing holding part, two ball bearings, and a rotor part. The bearing holding part is fixed at the center of the base part. Two ball bearings are fixed on the inner side of the bearing holding portion, and the armature is fixed on the outer side. By inserting the shaft into the ball bearing, the rotor part is supported rotatably with respect to the bearing holding part. An annular groove is provided in the base portion so as to surround the periphery of the bearing holding portion. A helical coil spring is placed in the groove. The upper end of the coil spring is in axial contact with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D25/08F04D29/05
CPCF04D25/0626F04D29/083F04D25/0613F04D29/0513F04D29/063F04D29/051F04D25/062
Inventor 广野祯一长谷川朋广野田慎一朗池上祥治藤本将文
Owner NIDEC CORP