Extractor hood

Abstract

The invention discloses an extractor hood which comprises an exhaust fume collecting hood, a box body assembly arranged on the exhaust fume collecting hood and a fan arranged in the box body assembly,wherein an air suction opening is formed in the top of an inner cavity of the exhaust fume collecting hood; the extractor hood also comprises a ventilation pipeline; the air inlet end of the ventilation pipeline is arranged at an air outlet of the fan; an air collecting hook capable of sending the partial air flow at the air outlet of the fan into the ventilation pipeline is arranged on the air inlet end of the ventilation pipeline; the front end surfaces of the two sides of the exhaust fume collecting hood are an inclined downward plane; a variable-diameter circular arc surface is arranged between the front side of the inner cavity of the exhaust fume collecting hood and the plane; the variable-diameter circular arc surface is in an inwards recessed shape; a plurality of air outlet holesare vertically arranged in the plane; the air outlet end of the ventilation pipeline respectively communicates with the air inlet ends of air outlet holes; the airflow driven in the circular arc surface region can form a cyclone flow; the suction force of the extractor hood per se is matched, so that a unique spiral air flow is formed; a spiral suction gathering effect can be formed; and an efficient exhaust fume suction effect in a gathered manner is achieved.

Description

technical field [0001] The invention relates to the field of kitchen utensils, in particular to a range hood. Background technique [0002] The range hood is the main means of collecting fume in the kitchen. How to improve the suction efficiency of the range hood has always been an important content in the design and research of the range hood. When the traditional range hood is inhaling, its inhalation range is a hemispherical area, and the gas in all directions is indifferently inhaled. The air flow velocity at the suction port of this suction method is relatively high, while the air flow velocity at a position away from the suction port will decrease rapidly as the distance away from the suction port increases. Therefore, in a very short distance below the suction port, the upward speed of the air has become very small, so that the upward suction force is insufficient, and it is very susceptible to interference from external factors, such as people walking, fans, etc. O...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects in the above-mentioned prior art, the technical problem to be solved by the present invention is: to prevent the fumes or pollutants from escaping due to the disturbance of the external air flow, and to improve the smoke collection and smoking effect of the range hood

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