Rotating filter for a dishwashing machine
First Claim
Patent Images
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; and
a liquid filtering system comprising;
a filter chamber;
a rotating filter located within the filter chamber and having an upstream surface and a downstream surface and located within the recirculation flow path such that the sprayed liquid passes through the filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid; and
a first artificial boundary spaced apart from at least a portion of the upstream surface to form a gap between the first artificial boundary and the upstream surface such that the proximity of the first artificial boundary to the rotating filter causes an increase in the angular velocity of liquid passing through the gap to form an increased shear force zone adjacent the filter;
wherein the rotating filter fluidly divides the filter chamber into a first part that contains filtered soil particles and a second part that excludes filtered soil particles and where 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
117 Citations
34 Claims
-
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; and a liquid filtering system comprising; a filter chamber; a rotating filter located within the filter chamber and having an upstream surface and a downstream surface and located within the recirculation flow path such that the sprayed liquid passes through the filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid; and a first artificial boundary spaced apart from at least a portion of the upstream surface to form a gap between the first artificial boundary and the upstream surface such that the proximity of the first artificial boundary to the rotating filter causes an increase in the angular velocity of liquid passing through the gap to form an increased shear force zone adjacent the filter; wherein the rotating filter fluidly divides the filter chamber into a first part that contains filtered soil particles and a second part that excludes filtered soil particles and where 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. 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; and a liquid filtering system comprising; a filter chamber; a rotating filter located within the filter chamber and fluidly dividing the filter chamber into a first part that contains filtered soil particles and a second part that excludes filtered soil particles and having an upstream surface and a downstream surface and located within the recirculation flow path such that the sprayed liquid passes through the filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid; and a first artificial boundary spaced from at least a portion of one of the upstream surface and one of the downstream surface to form a gap and such that the proximity of the first artificial boundary to the at least a portion of one of the upstream surface and one of the downstream surface forms one of a liquid expansion zone and a liquid pressurized zone, respectively, therebetween; wherein liquid will backwash from the downstream surface to the upstream surface in response to the one of the liquid expansion zone and the liquid pressurized zone. - View Dependent Claims (32, 33, 34)
-
Specification