Active noise reduction device, range hood and active noise reduction method

Abstract

The invention relates to an active noise reduction device, a range hood and an active noise reduction method.The active noise reduction device comprises a sound signal collecting device, a processor, a sound signal transmitting device, a first cover body and a second cover body, the processor is connected with the sound signal collecting device and the sound signal transmitting device, and each cover body is provided with a cavity; the first end of each cavity is open, the second end of each cavity is closed, the sound signal acquisition device and the sound signal transmitting device are respectively located in the corresponding cavities, and the openings of the two cavities are arranged back to back; when fluid enters any cavity through the opening of the cavity, an air pressure mass is formed in any cavity, and the air pressure mass in the cavity cannot be continuously discharged from the closed second end of the cavity, so that subsequent fluid is prevented from continuously flowing into the cavity from the opening of the cavity; therefore, the sound signal acquisition devices or the sound signal transmitting devices in the cavities are protected, and pollution and adverse effects of oil smoke or water vapor on the devices in the cavities are avoided.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to an active noise reduction device, a range hood and an active noise reduction method. Background technique [0002] The range hood is an important kitchen appliance in the kitchen, and it is very important to keep the air in the kitchen environment clean. When the range hood is working, noise is usually generated, which seriously affects the user's experience when using the range hood. In order to reduce the adverse effects of the noise of the range hood, passive noise reduction or active noise reduction is mainly used for noise reduction. [0003] Chinese utility model patent CN209213939U discloses a range hood, an active noise reduction system for a range hood and its sealing device. The hood includes an active noise reduction system, and the sound collection unit or speaker of the active noise reduction system is arranged in a sealing device Inside. The sealing device includes a s...

AI Technical Summary

Problems solved by technology

[0005] Firstly, a detachable device is provided on the shell where the sound collection unit or the speaker is arranged on the sealing device facing the air inlet of the range hood, and then a through hole sealed by an oil-proof sound-permeable film is left on the surface of the detachable device In this way, although the influence of oil fume from the air inlet on the active noise reduction system is blocked to a certain extent, the use of oil-proof sound-permeable film increases the cost of active noise reduction and the overall cost of the range hood;

[0006] Secondly, the operating conditions of the range hood are changeable, and the noise generated by the motor of the range hood is not exactly the same under different working conditions, and the setting position of the active noise reduction device has a great influence on the noise reduction effect of the noise generated by the range hood. It also has an important impact. The setting position of the active noise reduction system used in the above-mentioned range hood is fixed, which is not conducive to adjusting the active noise reduction system to the best position to achieve better active noise reduction effect

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