A backward centrifugal fan for a range hood and the range hood

Abstract

A backward centrifugal fan for a range hood comprises an impeller; the impeller comprises a front disc, a rear disc and a plurality of blades arranged between the front disc and the rear disc, and thebackward centrifugal fan is characterized in that the blades are straight blades. The invention further discloses a range hood applying the backward centrifugal fan. The deep arc-shaped blades of thebackward fan are changed into the straight blades, so that oil is not liable to accumulate and the blades are not sensitive to accumulated oil, and the blades are very suitable for the environment ofthe range hood; a small number of straight blades are arranged, so that a diffusion volute does not need to be arranged outside the impeller of the backward fan, and the fan is convenient to clean and maintain; the number of the blades is small, and the blade channels are wide, so that the separation vortex is not prone to block the channels, the flowing efficiency can be improved, the flowing direction of pollutants is met, accumulated dust is small, and accumulated dirt is convenient to clean.

Description

technical field [0001] The invention relates to a kitchen appliance, in particular to a backward centrifugal fan for a range hood, and a range hood using the backward centrifugal fan. Background technique [0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Generally, range hoods include top-suction and near-suction types. Top-suction range hoods use the principle of rising hot air to absorb and discharge the naturally rising oil fumes generated during cooking. It has more and more widespread applications, but because its power source is far away from the stove, the suction effect of the power source is reduced, and the oil fume cannot be completely sucked; the near-suction range hood uses the vortex wind pressure to keep most of The oil fume that is closer to the stove is absorbed in an arc, which can reduce the adverse effects on human health, and the power source is closer to the stove, so the suction effect of the power source...

AI Technical Summary

Problems solved by technology

[0008] However, due to the large amount of grease inside the range hood, if the above-mentioned backward centrifugal fan is directly applied to the range hood, it will be the same as the blades of the forward centrifugal fan, resulting in serious oil accumulation, dust accumulation, and even damage to the flow channel molded line, leading to failure of the fan function

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