WASHING MACHINE FOR AUTO-ADDED WASHING AGENT BY NEGATIVE PRESSURE AND CONTROLLING METHOD THEREOF

摘要

The invention discloses a washing machine for automatically adding the detergent by negative pressure and controlling method thereof. The washing machine comprises a water inlet, a detergent container and a tub. Two inflow water passages, i.e. a main inflow waterway and a rinse waterway, are provided between the water inlet and the tub. A dosing container which communicates with the detergent container is provided between the rinse waterway and the tub. A venturi tube is provided in the main inflow waterway. Due to venturi effect, the main inflow water stream becomes narrower and the water inflowing velocity is accelerated, so that a relative vacuum area which communicates with the dosing container is formed at the rear side of the venturi tube outlet, negative pressure is generated in the dosing container, and then the detergent in the detergent container, which communicates with the dosing container, is pumped into the dosing container. The burden of manually adding the detergent is eased, and the shortage or excess of the detergent is avoided. At the same time, by replacing other configurations for adding the detergent, the full automation of washing course can be realized and the washing efficiency is improved.