Range hood and control method thereof

Abstract

The invention discloses a range hood. The range hood comprises an air inlet assembly, a fan frame arranged above the air inlet assembly and a fan system arranged in the fan frame, wherein the fan system is provided with a main air inlet facing backwards and an auxiliary air inlet facing forwards, the range hood further comprises first flow deflectors and second flow deflectors arranged in the fanframe, the two first flow deflectors extend in the front-back direction and are arranged below the left side and the right side of the fan system correspondingly, each first flow deflector gradually inclines downwards from front to back, the two second flow deflectors extend in the front-back direction and are arranged below the left side and the right side of the fan system in a left-right movingmode correspondingly, and each second flow deflector gradually inclines downwards from front to back. The invention further discloses a control method of the range hood. Compared with the prior art,the range hood and the control method have the advantages that vortexes inside the range hood and separated boundary layers of air flow can be adjusted, so that the air flow impact on an impeller of the fan system is relatively uniform.

Description

technical field [0001] The invention relates to a cooking fume purification device, in particular to a range hood and a control method for the range hood. Background technique [0002] The range hood is one of the essential kitchen equipment in modern families. The range hood works on the principle of fluid dynamics. It 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 top suction, side suction and low suction. At present, the common products in the market...

AI Technical Summary

Problems solved by technology

[0007] However, there are the following problems: the low-suction range hood has a narrow and long suction port, and the airflow from the suction port to the fan box produces diffusion loss and unstable turbulent flow. This unstable turbulent flow periodically impacts the impeller. The motor speed fluctuates greatly, which leads to the range hood skipping gears under the user's back pressure system conditions on different floors

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

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