Vertical range-hood active noise reduction device and noise reduction method with application of device

Abstract

A vertical range-hood active noise reduction device and a noise reduction method with the application of the device are disclosed. An air inlet of the range hood is divided into at least two air inlet ducts. A separate active control device is installed in each air inlet duct. Each active control device contains a reference microphone, an error microphone and a loudspeaker and is controlled by an active noise reduction controller. The reference microphone is installed at the back end of the corresponding air inlet duct. The error microphone is mounted at the front end of the corresponding air inlet duct. The loudspeaker is positioned between the reference microphone and the error microphone. The invention has advantages as follows: each active control device cooperates with the active noise reduction controller; and according to values of noise signals and error signals, output of the loudspeaker is adjusted through the active noise reduction controller. Thus, the purpose of noise reduction is achieved on the precondition of not influencing other parameters of the range hood or reducing performance of the range hood. In particular, low-and-medium frequency noise of the vertical range hood is greatly reduced, and the main noise pollution source of a kitchen is eliminated.

Description

technical field [0001] The invention relates to a near-suction range hood, in particular to an active noise reduction device for a near-suction range hood and a noise reduction method using the device. Background technique [0002] The noise of the range hood is mainly caused by the working noise of the motor, the rotation of the impeller cutting the air, and the impact of the air in the volute. When the range hood is in use, due to the vibration of the motor and the flow of gas in the flue and the casing, it often produces a lot of noise, which becomes the main source of noise pollution in the kitchen. [0003] Existing range hood noise reduction technologies include sound-absorbing treatment, sound-insulating treatment, etc. Sound-absorbing treatment includes using sound-absorbing materials or sound-absorbing structures to absorb sound energy, thereby reducing noise intensity. Features, so that the sound waves are reflected on the sound insulation components to achieve th...

AI Technical Summary

Problems solved by technology

Although the range hood with an active noise reduction device can effectively reduce noise, and the exhaust air volume of the range hood will not be sacrificed during the noise reduction process, it is still structurally weak because it cannot expand the noise reduction frequency range. To be further improved

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