Additive auto-feeding device and washing machine

Abstract

An additive auto-feeding device, including a water supply flow channel; a liquid storage box containing an additive; a suction structure capable of sucking the additive to the flow channel and transferring the additive to a water outlet; and an anti-back suction device at a pressure adjusting opening of the flow channel. When water enters the flow channel, under the pressure effect of flowing water, the anti-back suction device closes the pressure adjusting opening; and when negative pressure is generated in the flow channel, the anti-back suction device opens the pressure adjusting opening for adjusting the pressure in the flow channel. The pressure adjusting device automatically adjusts opening and closing of an air hole to correspondingly adjust the pressure in a tube and avoid existence of negative pressure in the tube, thus achieving a backflow prevention function.

Dependencies are inferred from the claim text.