Multi-mesh mechanical filter screen system for dishwashers

摘要

A soil separator for a dishwasher includes soil accumulator channels open to the dishwasher chamber but covered by a filter screen having a fine filter region and a coarse filter region. Accumulator sumps are arranged below the accumulator channels. The shallow accumulator channels allow water to flush soil from an inside of the screen to the accumulator sumps. The channel below the fine filter region is flow connected through a pressure control valve or standpipe to the channel below the coarse filter region. If the fine filter region becomes clogged, the soil laden water can be passed into the coarse filter region for coarse screening.