Rotating filter for a dishwashing machine

摘要

A dishwasher with a tub at least partially defining a washing chamber, a liquid spraying system, a liquid recirculation system defining a recirculation flow path, and a liquid filtering system. The liquid filtering system includes a rotating filter disposed in the recirculation flow path to filter the liquid.

主权项

1. A dishwasher comprising:
a tub at least partially defining a washing chamber; a liquid spraying system supplying a spray of liquid to the washing chamber; a liquid recirculation system recirculating the sprayed liquid from the washing chamber to the liquid spraying system to define a recirculation flow path including a wash pump, having an impeller, fluidly coupled to the recirculation path to pump the liquid from the washing chamber to the liquid spraying system; and a liquid filtering system comprising:
a housing defining a chamber;a cylindrical rotating filter enclosing a hollow interior and having an upstream surface and a downstream surface and located within the chamber such that the recirculation flow path passes through the filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid and wherein the filter is coupled at a first end to the impeller of the wash pump to effect rotation of the filter; anda first artificial boundary formed by a portion of the housing extending to an overlying relationship with at least a portion of the upstream surface to form an increased shear force zone between the first artificial boundary and the upstream surface; wherein a portion of the impeller is located within the chamber and during the recirculating the chamber is configured to be filled with liquid and rotation of the impeller draws liquid through the filter into the hollow interior of the filter and into an inlet opening of the impeller and where the rotating filter is configured to create a rotational flow of unfiltered liquid within the chamber about the upstream surface to create a significant increase in angular velocity of the liquid in the increased shear force zone between the first artificial boundary and the upstream surface such that liquid passing between the first artificial boundary and the rotating filter applies a greater shear force on the upstream surface than liquid in an absence of the first artificial boundary.