Fan device achieving active noise reduction

An active noise reduction and fan technology, which is applied to components of pumping devices for elastic fluids, machines/engines, liquid fuel engines, etc., to achieve the effects of simple implementation, elimination of fan noise, and broad application prospects

Active Publication Date: 2014-11-12
SHANDONG LANGCHAO YUNTOU INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problems of fan noise in air cooling and heat dissipation, and p

Method used

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  • Fan device achieving active noise reduction
  • Fan device achieving active noise reduction

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Experimental program
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Effect test

Embodiment 1

[0019] In this implementation of the fan device for active noise reduction, the circular cavity assembly is provided with a noise reduction device for fan noise reduction. figure 2 It is the logical block diagram of the noise reduction device; as attached figure 2 As shown, the noise reduction device includes a noise collection unit, a noise reduction module and a noise reduction speaker unit, and the noise reduction module includes other related circuits such as an active noise reduction SOC chip, a power supply circuit, and a power amplifier circuit; the noise collection unit, The active noise reduction SOC chip, the power amplifier circuit and the noise reduction speaker unit are connected in sequence, and the active noise reduction SOC chip includes but is not limited to a noise signal acquisition input unit, a noise inversion control unit, and a noise reduction signal output drive unit. The input end of the noise signal acquisition input unit is connected to the noise a...

Embodiment 2

[0023] The difference between Embodiment 2 and Embodiment 1 is that the noise reduction device of the active noise reduction fan device described in Embodiment 2 adopts the front and rear feedback mode, and the noise collection unit is located at the outlet of the fan air duct in the backward feedback mode. .

[0024] The active noise reduction fan device of the present invention fixes the fan in the circular cavity assembly through the fan fixing structure, which can effectively prevent the influence of noise diffusion on the environment. The noise reduction process of the noise reduction device of the present invention is as follows: the active noise reduction SOC chip collects noise signals through the noise acquisition unit, performs noise signal analysis and automatic gain control through the noise signal acquisition input unit, and performs noise signal analysis and automatic gain control in the noise inversion control unit. A noise-reduction signal with equal amplitude ...

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Abstract

The invention discloses a fan device achieving active noise reduction. The fan device is in the shape of a circular cavity assembly. A noise reduction device and a fan fixing structure are arranged in the circular cavity assembly. The noise reduction device comprises a noise collection unit, a noise reduction module and a noise reduction loudspeaker unit. The noise reduction module comprises an active noise reduction SOC chip and a power amplifier circuit. The noise collection unit, the active noise reduction SOC chip, the power amplifier circuit and the noise reduction loudspeaker unit are connected in sequence. A noise reduction loudspeaker fixing assembly is also arranged in the cavity of the circular cavity assembly. According to the fan device achieving active noise reduction, the noise collection unit and the noise reduction module are installed on a fan air channel, signals with phases opposite to phases of noise sources are generated by means of the active noise reduction technology, fan noise is counteracted inside the pipeline, and the fan noise is effectively lowered; in addition, the fan device has the advantages of being advanced in technology, easy and convenient to achieve, wide in application prospect and the like.

Description

[0001] technical field [0002] The invention relates to a noise reduction device, in particular to an active noise reduction fan device. Background technique [0003] At present, the integration degree of computers and servers is getting higher and higher, and the density per unit volume is getting higher and higher, which brings about the continuous improvement of heat dissipation efficiency. As far as the current air-cooled heat dissipation is concerned, increasing the number of fans and increasing the speed to increase the air volume is still the basic method to solve the heat dissipation problem. However, the increase in the number and speed of fans will undoubtedly lead to an increase in environmental noise. At present, noise has become a pollution source that seriously affects human health in high-performance computers, high-density servers and other equipment, as well as in computer rooms and data centers. For noise control, passive methods are mostly used at presen...

Claims

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Application Information

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IPC IPC(8): F04D29/66
Inventor 金长新刘强于治楼
Owner SHANDONG LANGCHAO YUNTOU INFORMATION TECH CO LTD
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