Electric non-return air door capable of being automatically closed in power failure

Abstract

The invention discloses an electric non-return air door capable of being automatically closed in power failure. The air door comprises an air duct assembly, two symmetrically-arranged non-return pieces, a driving device, a control circuit board and a backup battery charging and discharging assembly, and the two non-return pieces are rotatably installed in an air duct through rotating shafts respectively so as to jointly open or close the air duct; the driving device comprises a shell, a driving motor and a transmission gear set, and the driving motor is connected with the rotating shaft through the transmission gear set; the control circuit board comprises a driving control unit, a charging and discharging unit and a power supply detection unit; a power supply signal input end and a control signal input end of the driving control unit are electrically connected with an alternating current output end and a control signal output port of a range hood respectively; the signal output end of the driving control unit is electrically connected with the signal input end of the driving motor; and the backup battery charging and discharging assembly is electrically connected with the driving control unit through the charging and discharging unit. The electric non-return air door has the beneficial effects that when power is off, the backup battery charging and discharging assembly controls the electric non-return air door to be closed in time to prevent lampblack from flowing backwards.

Description

technical field [0001] The invention relates to an electric anti-reverse damper which can be automatically closed when the power is off. Background technique [0002] The non-reverse damper is a device used at the connection between the exhaust pipe of the hood and the flue. Existing non-reverse damper is divided into two kinds of mechanical type and electric type. The mechanical anti-reverse damper relies on wind pressure to open the anti-reverse film, and when the wind pressure decreases or negative pressure occurs, the anti-reverse film closes. The anti-reverse damper of this form has a small exhaust section, and after long-term use, the anti-reverse effect is weakened, causing the soot gas in the flue to flow backward into the kitchen. The electric anti-reverse damper relies on the power of the motor to open and close the anti-reverse damper. Compared with the mechanical anti-reverse damper, this form of anti-reverse damper opens more properly and closes more tightly. ...

AI Technical Summary

Problems solved by technology

However, the action energy of the electric non-reverse damper comes from electricity. Once a power failure occurs in the open state, the electric non-reverse damper will not be able to operate, resulting in the loss of the non-reverse function, and the oil fume in the flue can overflow into the kitchen without hindrance.

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