Range hood and control method thereof

Abstract

The invention discloses a range hood. The range hood comprises a draught fan system, the draught fan system involves a volute and an impeller located in the volute, and a first air inlet is formed in the volute; the range hood further comprises an air intake device, and the air intake device comprises a first flow guide cover arranged opposite to the first air inlet; and the range hood is characterized in that the air intake device further comprises a partition tongue, the partition tongue is arranged outside the volute and adjacent to the first air inlet, the first flow guide cover and the partition tongue form a complete whole, an air intake duct is formed in the first flow guide cover and the partition tongue, the partition tongue can rotate relative to the volute so as to change the shape of the air intake duct, and a rotating shaft of the partition tongue is parallel to the axis of the impeller. The invention further discloses a control method of the range hood.

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] 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 at 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] When the range hood is running, the aerodynamic performance and noise are not only related to the performance of the multi-...

AI Technical Summary

Problems solved by technology

However, the flow channel profile on the radial plane of this invention is a single arc design, and the flow field design is not carried out on the profile line, which fails to fundamentally solve the problem of flow around the air channel, and cannot effectively guide the air flow evenly into the fan inlet

[0007] The above-mentioned methods can eliminate the vortex in the air duct to a certain extent, and facilitate the airflow to accelerate into the fan, but none of them can effectively solve the problem of the airflow swirl in the air intake duct, and ensure that the airflow evenly fills the inlet of the fan system

In addition, under different working conditions, the airflow in the air duct varies in its swirling state, strength, and scale. The common internal flow guide device only has a flow control effect at certain operating conditions, and cannot affect the variable working conditions of the whole machine.

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