Gas back flow-proof smoke exhaust ventilator

Abstract

The invention relates to an airflow downdraft preventing lampblack exhauster which consists of a shell that is provided with left and right wind suction orifices and a master air vent, as well as an electric control mechanism that comprises a power supply input plug, a smoke suction fan, an illuminating lamp and a switch; and is characterized in that an electric door closing device that consists of a ring-shaped shell with door spindle installation orifices, an open type door that is provided with a rigid door spindle and arranged inside the chamber of the ring-shaped shell by the symmetric door spindle installation orifices, as well as a speed reducing motor that can be controlled to drive the rotation of the open type door is connected with and arranged at the master air vent of the lampblack exhauster; an electric working loop of the electric control mechanism further comprises a cam contact switch, the speed reducing motor and a current relay; and by controlling the open type doorto rotate by 90 degrees so as to be opened to smoothly discharge lampblack gases, and further to rotate by 270 degrees so as to be closed, and separating airflow channels, the lampblack exhauster canhave outdoor airflow downdraft prevention function, thus having extremely strong practicability and wide market application prospect.

Description

technical field [0001] The invention relates to a kitchen electrical appliance, in particular to an anti-airflow backflow type range hood that can ensure unimpeded exhaustion of oil fume gas in a normal working state and can effectively isolate indoor and outdoor airflow in a non-working state. Background technique [0002] The problem of airflow backflow in the exhaust duct of the range hood has been recognized as not a general problem of gas backflow and odor, but has risen to a social problem closely related to the health of the people. It has been received by the urban construction department and the environmental protection department. The attention of leaders at all levels is currently actively conducting investigations and research to seek solutions. The inventor thinks that the cause of the backflow of the airflow is multifaceted, which is not only related to the windshield isolation function of the louver door with one-way outwardly opening blades arranged on the ai...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the drawbacks of the existing range hoods, such as the unsmooth external exhaust fume flow and poor reliability when isolating the indoor and outdoor air flow, to provide a device that can ensure unimpeded external exhaust fume flow, and can Anti-airflow backflow type range hood that reliably isolates indoor and outdoor airflow

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