Sound guide device and range hood

Abstract

The invention discloses a sound guide device which is used for a range hood. The device comprises a mounting seat. The mounting seat comprises a cavity. A plurality of sound guide sheets are arrangedin the cavity and divide the cavity into a plurality of sound guide channels. Each sound guide channel comprises a depth and a width, and a ratio of the depth and the width of each sound guide channelis not less than 1. Through research, a noise of the range hood is concentrated in a medium-high frequency band which is above 500 HZ. A noise wavelength is short, such as light waves and other short-frequency waves, and certain directivity is realized in nature. In the invention, the plurality of sparse sound guide plates with a certain depth are used for constraining a noise (the most importantway of transmitting the noise to the indoor during actual use) transmitted from an exhaust inlet of the range hood, and the sound guide plates directionally transmit the sound waves of medium-high frequency bands so that the sound waves are not directly emitted to ears, intensity of the noise received by the ears is reduced, and use experience of people is improved.

Description

technical field [0001] The invention relates to the field of home appliances, in particular to range hoods. Background technique [0002] Today, the range hood has become a popular electrical appliance in the households of our country. It can be used to remove the smoke generated during cooking and keep the kitchen clean and healthy. However, the problem brought by the use of range hoods is the strong noise generated by the fan. Housewives and kitchen operators who have been exposed to this noise for a long time will have adverse reactions such as headaches, irritability, and panic, which will seriously affect their health. influences. Therefore, the design of quiet range hoods has become a problem that manufacturers generally pay attention to. [0003] The noise reduction measures usually adopted mainly include noise reduction at the sound source, noise reduction during transmission or active noise reduction technology. Among them, the noise reduction at the sound source...

AI Technical Summary

Problems solved by technology

Among them, the noise reduction at the sound source mainly adopts the noise reduction of the internal flow field structure such as optimizing the air duct, such as modifying the radius of the front end of the fan volute tongue, increasing the gap between the outer edge of the centrifugal fan impeller and the centrifugal fan volute tongue, and the centrifugal fan volute tongue. The use of inclined design to achieve the purpose of noise reduction has poor versatility and structural adaptability, and needs to be matched with different external flow field structures. It is only for specific products or products of the same series, and the versatility is not strong; and in the process of communication Noise reduction is mainly to add sound-absorbing cotton or muffler equipment to the hood. However, after long-term use, the sound-absorbing cotton will lose its noise-reducing effect due to oil inhalation. The cost is high, and the air duct resistance is increased to reduce the air volume; and for the active noise reduction of the range hood, the most common method at present is to arrange the active noise reduction device inside the range hood, but in the actual use of the range hood, its internal cavity is affected Affected by oil fume, the environment is very harsh. Noise reduction devices exposed to oil fumes will be corroded by high-temperature oil, which will affect the service life of the noise reduction device and system stability. At the same time, the cost of active noise reduction devices is relatively high

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