Rotating filter for a dishwasher

Patent metadata

Field	Value
Publication number	US-2016100738-A1
Application number	US-201514967918-A
Country	US
Kind code	A1
Filing date	Dec 14, 2015
Priority date	May 30, 2012
Publication date	Apr 14, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . A dishwasher for treating dishes according to at least one automatic cycle of operation, comprising:
a tub at least partially defining a treating chamber for receiving dishes for treatment; a sprayer proximate to the tub to spray liquid into the treating chamber; a pump fluidly coupled between the treating chamber and the sprayer to define a circulation circuit for circulating the sprayed liquid from the treating chamber to the sprayer; a rotating filter located within the circulation circuit such that the circulated liquid passes through the filter from an upstream surface to a downstream surface; a diverter extending along and spaced away from at least a portion of at least one of the upstream and downstream surfaces to define a gap between the diverter and the filter; and a diverter mount operably coupling the diverter to the filter such that there is only a one tolerance stack up between at least one portion of the diverter and one portion of the filter that effects the gap.

2 . The dishwasher of claim 1 wherein the diverter mount comprises a diverter bearing surface on the diverter and a filter bearing surface on the filter, with the diverter bearing surface and the filter bearing surface being in contact during rotation of the filter to form the one tolerance stack up.

3 . The dishwasher of claim 2 wherein the filter comprises a frame, with at least a part of the frame forming the filter bearing surface.

4 . The dishwasher of claim 3 wherein the filter comprises a screen, which is supported by the frame, with the screen having a first surface defining the upstream surface and a second surface defining the downstream surface.

5 . The dishwasher of claim 4 wherein the position of the screen is fixed relative to the frame.

6 . The dishwasher of claim 5 wherein the screen defines a hollow body having an exterior, defined by one of the first and second surfaces, and an interior, defined by the other of the first and second surfaces.

7 . The dishwasher of claim 6 wherein the filter further comprises a stationary shaft.

8 . The dishwasher of claim 7 wherein the diverter mount has a first mount supported by the shaft.

9 . A dishwasher for treating dishes according to at least one automatic cycle of operation, comprising:
a tub at least partially defining a treating chamber for receiving the dishes for treatment; a sprayer proximate to the tub to spray liquid into the treating chamber; a pump fluidly coupled between the treating chamber and the sprayer to define a circulation circuit for circulating the sprayed liquid from the treating chamber to the sprayer; a rotating filter comprising a frame supporting a screen, with the frame having at least one filter bearing surface extending beyond the screen, and the filter located within the circulation circuit such that the circulated liquid passes through the screen from an upstream surface to a downstream surface as the filter rotates; a first diverter extending along at least a portion of one of the upstream and downstream surfaces, and having a diverter bearing surface; and a biasing device relatively biasing the rotating filter and the first diverter such that the filter bearing surface and the diverter bearing surface contact; wherein the filter and first diverter are arranged such that when the filter bearing surface and diverter bearing surface are in contact, the first diverter is spaced from the screen to form a gap between the first diverter and the screen.

10 . The dishwasher of claim 9 wherein the filter bearing surface extends beyond the screen.

11 . The dishwasher of claim 10 wherein the filter defines a hollow body and the filter bearing surface comprises a projection extending about a periphery of the hollow body.

12 . The dishwasher of claim 11 wherein the frame comprises at least one ring, with a portion of the ring projecting beyond the screen to form the projection.

13 . The dishwasher of claim 9 , further comprising a shroud at least partially enclosing the filter and having an access opening, with the first diverter located within the access opening.

14 . The dishwasher of claim 13 wherein the first diverter projects through the access opening.

15 . A dishwasher for treating dishes according to at least one automatic cycle of operation, comprising:
a tub at least partially defining a treating chamber for receiving the dishes for treatment; a sprayer proximate to the tub to spray liquid into the treating chamber; a pump fluidly coupled between the treating chamber and the sprayer to define a circulation circuit for circulating the sprayed liquid from the treating chamber to the sprayer; a rotating filter comprising a body in which are provided a plurality of openings, and the filter located within the circulation circuit such that the circulated liquid passes through the plurality of openings from an upstream surface to a downstream surface as the filter rotates; and a first diverter extending along at least a portion of one of the upstream and downstream surfaces, and having a diverter bearing surface; wherein the sum of the individual areas of the plurality of openings defines a cumulative open area for the body, the area of the body exposed to the circulation circuit defines the body area, and the ratio of the open area to the body area is 0.15 to 0.25.

16 . The dishwasher of claim 15 wherein the ratio is a function of the rotational speed of the filter.

17 . The dishwasher of claim 16 wherein the rotational speed of the filter is between 2000 and 3500 rpm.

18 . The dishwasher of claim 16 wherein the pump comprises an inlet in fluid communication with the circulation circuit and an outlet in fluid communication with the circulation circuit, and the ratio is a function of at least the area of one of the inlet and the outlet.

19 . The dishwasher of claim 18 wherein the inlet has an area of 660 to 810 mm 2 and the outlet has an area of 450 to 500 mm 2 .

20 . The dishwasher of claim 19 wherein the pump comprises a volumetric flow rate and the ratio is a function of the volumetric flow rate.

Assignees

• Whirlpool Co

Inventors

• Blanchard Walter T
• Geda Jacquelyn R
• Jozwiak Todd M
• Miller John A
• Rappette Antony M
• Welch Rodney M

Classifications

• A47L15/4225

  Arrangements or adaption of recirculation or discharge pumps · CPC title

• A47L15/4221 Primary

  Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms (A47L15/0078 takes precedence) · CPC title

• A47L15/4202

  Water filter means or strainers · CPC title

• A47L15/4206

  Tubular filters · CPC title

• A47L15/4208 Primary

  Arrangements to prevent clogging of the filters, e.g. self-cleaning · CPC title