Smoke exhaust ventilator and control method thereof
A range hood and control method technology, applied in the direction of oil fume removal, heating method, visible signal device, etc., can solve the problems of uncoordinated appearance of range hood, limited area of TFT display interface, troubles, etc.
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[0026] As an embodiment of the present invention, the smoke detection device 10 includes an ultrasonic sensor, which is installed in the inner space of the main body of the range hood 1 . As the smoke concentration changes, the voltage signal output by the ultrasonic sensor also changes. By detecting the voltage signal, the current smoke concentration can be calculated. Therefore, the smoke concentration information detected by the smoke detection device 10 is a Voltage value. The smoke indicating device 20 includes light-emitting elements of more than two colors, and the light-emitting elements may be light-emitting diodes (LEDs), cold-cathode fluorescent lamps (CCFLs), organic light-emitting diodes (OLEDs), and the like. Since LED lamps have low power consumption, low cost, and multiple colors, LEDs are preferred as the light emitting elements of this embodiment. In a preferred embodiment of the present invention, the smoke indicating device 20 includes a red LED, a green L...
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