Noise reduction device, volute and extractor hood air duct system

Abstract

The invention provides a noise reduction device, a volute and an extractor hood air duct system, and relates to the technical field of kitchen appliances. The noise reduction device comprises a perforated plate and a cover plate; and a vibration reduction particle layer and / or an air bag layer filled with inert gas are / is arranged between the perforated plate and the cover plate. The volute comprises the noise reduction device, and the extractor hood air duct system comprises the volute. The noise reduction device, the volute and the extractor hood air duct system at least have the beneficialeffects of being excellent in noise reduction effect, easy to implement, capable of saving cost, good in universality and not prone to losing efficacy of the noise reduction effect.

Description

technical field [0001] The invention relates to the technical field of kitchen appliances, in particular to a noise reduction device, a volute and an air duct system of a range hood. Background technique [0002] The noise generated by the range hood during operation is mainly composed of two parts. The first is the vibration noise generated by the vibration of the range hood air duct system itself, and the second is the continuous flow of air flow during operation, which flows inside the air duct system. The generated aerodynamic noise, specifically, the noise-generating components of the range hood mainly include the motor, the impeller, and the air duct system mainly composed of the volute. The impeller is driven by the motor to input the airflow stably into the air duct system , the airflow breaks away from the surface of the impeller, and is discharged from the inlet to the outlet through the air duct system. During the process, the vibration of the motor and the separa...

AI Technical Summary

Problems solved by technology

This solution has a relatively good noise reduction effect, but because it is implemented based on the internal structure of the range hood, the same diversion structure installed on another slightly different range hood may have no effect at all , so there is a problem of poor versatility;

[0006] Third, perforate the surface of the air duct system to add sound-absorbing cotton. First, laser micro-perforation is performed on the surface of the volute of the air duct system, so that the surface has a regular array of small holes, and then the sound-absorbing cotton is attached to it. On the other hand, use glue or stainless steel brackets to fix, so as to achieve the effect of absorbing the radiated noise on the surface of the air duct system. This method belongs to the consumption of sound energy in the process of sound transmission, and then achieves the purpose of noise reduction; this method Although compared with the first two methods, the method is simpler to implement, more cost-effective, has higher versatility, and can achieve a more effective noise reduction function. However, this noise reduction solution mainly relies on sound-absorbing cotton for its sound absorption. There are tiny holes in the interior, so the sound-absorbing cotton will gradually absorb oil droplets during use, resulting in the problem of gradually losing the noise reduction effect, and the noise reduction effect that this noise reduction method can achieve is not very good, that is, it still exists Technical issues with limited noise reduction

[0007] At present, there are at least technical problems in the structure of the noise reduction design applied to the air duct system that cannot simultaneously achieve effective noise reduction effects, simple implementation, cost savings, good versatility, and the noise reduction effect is not easy to fail

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