Kitchen ventilator with oil-smoke separation device and noise reduction device and noise reduction method

Abstract

The invention discloses a kitchen ventilator with an oil-smoke separation device and a noise reduction device and a noise reduction method. The kitchen ventilator comprises a kitchen ventilator body,the three-dimensional space sound field noise reduction device for active noise reduction, and the oil-smoke separation device for absorbing and separating lampblack particles. The three-dimensional space sound field noise reduction device is assembled into the kitchen ventilator body. The oil-smoke separation device is assembled into the kitchen ventilator body in a driving mode.The three-dimensional space sound field noise reduction device is provided with a noise collection sensor and a noise reduction body. The noise collection sensor is used for detecting decibel of noise sources in the kitchen ventilator body. The noise reduction method includes the steps of decomposing a noise signal into multiple sub-band signals, acquiring a band-pass filter weight vector through conversion, converting the acquired band-pass filter weight vector into a corresponding loudspeaker sound field, transmitting a constant-strength sound wave signal to a corresponding loudspeaker, and reducing or eliminating noise waves generated by the kitchen ventilator through sound waves generated by the corresponding loudspeaker to reduce noise. The kitchen ventilator has the advantages that the technical problem of conflict between the noise and performance is solved, and on the premise of not sacrificing lampblack suction performance of the kitchen ventilator, the noise generated during operation of thekitchen ventilator is low and does not cause negative influence on users physiologically and mentally.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a range hood with an oil fume separation device and a noise reduction device and a noise reduction method. Background technique [0002] The current active noise reduction technology, such as the application of earphones, is a point-to-point noise reduction technology, that is, directional noise reduction, which cannot effectively eliminate noise in a large range. These techniques focus on eliminating one-dimensional plane sound waves in closed small ducts or small spaces, and are effective in the low frequency range (less than 500Hz). In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order sound mode...

AI Technical Summary

Problems solved by technology

In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order acoustic modes

But in three-dimensional space, high-order acoustic modes cannot be ignored, especially in closed large-space pipelines, noise reduction is very difficult and complicated

Usually, a variety of standing waves and a variety of sound waves in different directions interfere with each other and superimpose, which greatly increases the difficulty of noise reduction in three-dimensional space

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