Air stop mechanism, air supply system with air stop mechanism, air conditioner and control method

The invention relates to an air stop mechanism. The air stop mechanism comprises a cam, a first motor controlling the cam to rotate, and a ratchet wheel air stop assembly; the ratchet wheel air stop assembly comprises a ratchet wheel, an air baffle fixed to the ratchet wheel, and a second motor driving the ratchet wheel and the air baffle to rotate; the ratchet wheel comprises a wheel body and ratchet teeth formed on the periphery of the wheel body, and ratchet grooves are formed between the ratchet teeth; and the cam is provided with a short-diameter large end and a long-diameter small end. The cam is rotatably matched with the ratchet wheel, wherein when it is needed to adjust the angle of the air baffle, the second motor drives the ratchet wheel and the air baffle on the ratchet wheel to rotate, and the first motor controls the cam to rotate to make the cam separated from the ratchet grooves and not interfere with rotation of the ratchet teeth; and when the air baffle is rotated toa set angle or a preset a