Patent ID: 6234184
Filing Date: 2001-05-22
Classification: A47L

Abstract:
A water circulation system for a dishwasher having a washing compartment, a drain, a pump housing, a recirculation pump within the housing for recirculating wash water to the washing compartment to clean objects therein, the water circulation system comprising:a primary filter for filtering objects from the wash water before it reaches the recirculating pump;a secondary filter for filtering wash water that has been filtered by the primary filter;a first passageway in communication with the pump housing for supplying wash water from the recirculation pump to a wash arm;a second passageway in communication with the pump housing for supplying wash water from the recirculation pump to the secondary filter;a chamber in communication with the second passageway for receiving wash water from the recirculation pump;an aperture formed in the chamber between the interior of the chamber and the exterior of the chamber;the secondary filter being disposed in the aperture for filtering wash water passing through the aperture;a third passageway in communication with the chamber and with the drain for draining the wash water from the chamber;any particles filtered by the second filter being washed away into the drain via the third passageway;the recirculation pump supplying a flow of wash water through the second passageway for washing the particles from the chamber during the draining of wash water;a check valve formed in the third passageway for preventing wash water from entering the chamber through the third passageway; andthe pump housing including a seat in the third passageway and the check valve is held in a closed posture against the seat by positive pressure from the pump while supplying wash water to the washing compartment.