Noise reduction device of range hood

Abstract

The invention relates to a noise reduction device of a range hood. The noise reduction device is characterized in that a fan inlet is detachably provided with a lower noise-damping device; the lower noise-damping device comprises at least one noise-damping unit; the noise-damping unit comprises a longitudinally arranged noise-damping pipeline; the upper end of the noise-damping pipeline is communicated with the fan inlet, and the lower end of the noise-damping pipeline is communicated with the air outlet of a fume collecting hood; the air inlet end of the noise-damping pipeline is provided with a speaker, the inner wall of the noise-damping pipeline is provided with a reference microphone and an error microphone which is positioned below the reference microphone; and the reference microphone, the error microphone and the speaker are controlled by an active noise reduction controller. The noise reduction device disclosed by the invention can realize the noise reduction without improving the internal structure of the range hood but just by detachably arranging the lower noise-damping device on the fan inlet, the noise-damping device can be assembled and dissembled freely, so that good universality and adaptability are achieved, the problem of noise at the air inlet of the rang hood can be well solved, and the problem of noise of the air outlet of the range hood can be solved by detachably arranging an upper noise-damping device on a fan outlet.

Description

technical field [0001] The invention relates to a range hood, in particular to a noise reduction device for the range hood. Background technique [0002] The range hood includes a blower fan, an air inlet filter screen and a range hood duct, and the fan is driven by a motor to suck out the oil fume inside the range hood duct. Fans and motors are important noise sources, and the aerodynamic noise also includes the turbulent airflow noise in the range hood duct and the noise generated by the airflow passing through the air inlet filter. [0003] At present, passive noise reduction is mainly used to reduce the noise of range hoods. Passive noise reduction generally uses aerodynamic methods to optimize the centrifugal fan and volute, or uses low-noise motors, or uses sound insulation or sound-absorbing material. Although the above-mentioned various passive noise reduction methods can also reduce noise, while reducing noise, they often lead to an increase in cost or at the cost...

AI Technical Summary

Problems solved by technology

Although the above-mentioned various passive noise reduction methods can also reduce noise, while reducing noise, they often lead to an increase in cost or at the expense of reducing the exhaust air volume of the range hood, and the noise reduction effect is not very obvious

As an improvement, active noise reduction is also used in the prior art to reduce the noise of the range hood. In the active noise reduction method of the range hood, the influence of the airflow on the microphone is extremely critical, and the disturbance of the airflow greatly interferes with the Improve the stability and noise reduction effect of the active noise reduction control system

For the active noise reduction of range hoods, please refer to the "Active Noise Reduction Device and Method and Noise Control System for Range Hoods" disclosed in the Chinese invention patent application with application number 201110102161.2 (application publication number is CN 103035234 A). And the patent No. ZL 201120253295.5 (authorized announcement number is CN 202188543 U) Chinese invention patent "range hood with active noise reduction device", the main defects of the above-mentioned active noise reduction system are: because the noise reduction device is placed Inside the range hood, the inside of the range hood needs to be modified. Not only is the design troublesome, but it will also cause some interference to the fan system, and it will not have a noise reduction effect on the vibration noise on the outer wall of the range hood.

In addition, the windproof design and duct design of the microphone in the range hood are not involved, and the stability and effectiveness of the noise reduction system are not good

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