Kitchen ventilator shell with noise interference device and kitchen ventilator

Abstract

A kitchen ventilator shell with a noise interference device is provided with a shell body and the noise interference device for reducing multi-frequency noise. The noise interference device is assembled to the shell body. Specific multi-frequency noise lowering is achieved by adjusting the area of two openings of the noise interference device, the integral length of the noise interference device or the shortest distance between the two openings. A long-term good noise lowering effect can be kept for the kitchen ventilator shell, and the noise interference device has the advantages that cost islow and reliability is high. The noise interference device interferes with noise transmitted in a main air flue pipe through the resonance amplitude and phase position of the specific noise frequency, accordingly, the amplitude of the noise frequency is reduced, and noise lowering of the specific multi-frequency noise is achieved. The material of the noise interference device is resistant to corrosion and chemical corrosion and is not prone to damage. The long-term good noise lowering effect can be kept for a kitchen ventilator, and the noise interference device has the advantages that cost is low and reliability is high.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a range hood casing with a noise interference device and the range hood. Background technique [0002] Long-term exposure to high-noise environments can damage people's hearing, and long-term exposure to high-noise environments can also cause emotional problems for users. With the improvement of people's quality of life, people's tolerance to noise is getting lower and lower. Therefore, the noise reduction of range hoods has also received more and more attention. [0003] The noise reduction of range hoods in the prior art mostly achieves noise reduction through active noise reduction and passive noise reduction. The active noise reduction method can only act on the noise with a frequency within 1000Hz, and the noise above 1000Hz can only be processed by passive noise reduction technology. However, passive noise reduction is mainly done by wrapping the noise source or pipe with soun...

AI Technical Summary

Problems solved by technology

However, there are several disadvantages as follows: 1. The air pressure loss is too large, noise and fluid need to pass through the sound-absorbing cotton, and use friction to consume sound energy to achieve the effect of noise reduction, but at the same time reduce the performance of the air

2. It is difficult to choose suitable sound-absorbing cotton. Few suppliers can provide data on the sound-absorbing rate of sound-absorbing cotton at different frequencies. Therefore, manufacturers of range hoods can only find out the appropriate type of sound-absorbing cotton through continuous trial and error. or thickness etc.

3. The noise reduction frequency of sound-absorbing cotton is uncontrollable. For common sound-absorbing cotton, it cannot achieve the maximum noise reduction effect at a specified narrow frequency, and it is impossible to match different strategies from the design to achieve more effective noise reduction.

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