Noise reduction device, range hood applying noise reduction device and control method thereof

Abstract

The invention discloses a noise reduction device. The device comprises a box body, one side of the box body is an elastic layer made of an elastic material, noise reduction holes are formed in the elastic layer, and the noise reduction device also comprises a deformation mechanism for driving the elastic layer to deform. The invention also discloses a range hood applying the noise reduction deviceand a control method of the range hood. Compared with the prior art, the device has the advantages that through the arrangement that the shape of at least one side of the noise reduction device can be adjusted, it is convenient to take targeted noise reduction measures for different working conditions; when applied to the range hood, and a vortex and a boundary layer of airflow inside the range hood can be separated for controlling rectification, so that air impact born by an impeller of a fan system is uniform, the noise of the air impact is reduced, the load on a motor is stable, trip stopwhen the range hood operates in different gears is prevented, and a good oil fume absorption effect when a user uses the range hood is ensured under different back pressure conditions at an outlet ofthe range hood.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a noise reduction device, a range hood applied with the noise reduction device, and a control method for the range hood. Background technique [0002] Range hoods have become one of the indispensable kitchen appliances in modern families. The range hood uses the principle of fluid dynamics to work, sucks and exhausts the range hood through a centrifugal fan installed inside the range hood, and uses a filter to filter some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated in the center of the fan, and the oil fume under the range hood is sucked into the fan, and after being accelerated by the fan, it is collected by the volute and guided out of the room. [0003] Common range hoods are roughly divided into three ty...

AI Technical Summary

Problems solved by technology

[0008] Due to the narrow and long suction inlet of the low-suction range hood, the air flow from the suction inlet to the fan box produces diffusion loss and unstable turbulent flow. This unstable turbulent flow periodically impacts the impeller, and the motor speed fluctuates greatly, resulting in The range hood skips gears under the user’s back pressure system on different floors

The use of optimized fan system cannot completely solve the problems of abnormal noise and unstable motor speed

Images