US Patent 7556050 Self-drainage preventing structure of dish washer

There is provided a self-drainage preventing structure of a dishwasher. The self-drainage preventing structure includes a tub having a steam discharge hole formed at a side portion thereof, a sump assembly mounted on a bottom of the tub and having a drain pump disposed at a side thereof, and a bypass tube connected to the drain pump to allow a part of washing water introduced into the drain pump to be returned to the tub.