Rotating filter for a dishwasher and methods of cleaning a rotating filter

Patent metadata

Field	Value
Publication number	US-9649007-B2
Application number	US-201615378382-A
Country	US
Kind code	B2
Filing date	Dec 14, 2016
Priority date	Oct 23, 2012
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A dishwasher with a tub at least partially defining a washing chamber, a liquid spraying system, a liquid recirculation circuit, and a liquid filtering system where the liquid filtering system includes a rotating filter and where a granular agent contacts the rotating filter to clean the filter. Methods of cleaning a rotating filter provided within a liquid flow by scouring the filter with a granular agent.

First claim

What is claimed is:

1. A dishwasher for treating dishes according to an automatic cycle of operation, comprising:
a tub at least partially defining a treating chamber;
a sprayer spraying a liquid into the treating chamber;
a recirculation circuit fluidly coupling the treating chamber to the sprayer and recirculating sprayed liquid back to the sprayer for subsequent spraying;
a rotating filter located within the recirculation circuit and filtering liquid passing through the recirculation circuit; and
a granular agent reservoir in open communication with at least a portion of the rotating filter and storing a granular agent, which contacts and scours the rotating filter to clean the filter during rotation.

2. The dishwasher of claim 1 wherein the rotating filter is located exteriorly of the tub.

3. The dishwasher of claim 2 , wherein the granular agent reservoir is spaced from the rotating filter to define a gap between the granular agent reservoir and the rotating filter.

4. The dishwasher of claim 3 wherein the granular agent reservoir comprises a channel and the granular agent is located within the channel.

5. The dishwasher of claim 4 wherein the granular agent comprises at least one bead.

6. The dishwasher of claim 5 wherein the granular agent reservoir further comprises a flow diverter that increases shear forces acting on a surface of the filter.

7. The dishwasher of claim 6 wherein the granular agent reservoir comprises a shroud enshrouding the filter.

8. The dishwasher of claim 5 wherein relative rotation of the filter to the granular agent reservoir and the at least one bead generates physical contact on the filter to remove soils.

9. The dishwasher of claim 1 wherein the rotating filter comprises two filter elements spaced from each other to form a gap.

10. The dishwasher of claim 9 wherein the granular agent reservoir further comprises a first end piece that spaces the two filter elements from each other at a first end, and a second end piece that spaces the two filter elements from each other at a second end.

11. The dishwasher of claim 10 wherein the granular agent is located within a gap between the first end piece and the second end piece.

12. A dishwasher for treating dishes according to an automatic cycle of operation, comprising:
a tub at least partially defining a treating chamber;
a sprayer spraying a liquid into the treating chamber;
a recirculation circuit fluidly coupling the treating chamber to the sprayer and recirculating sprayed liquid back to the sprayer for subsequent spraying;
a rotating filter located within the recirculation circuit and filtering liquid passing through the recirculation circuit; and
a granular agent supply comprising a granular agent configured to be dispensed from the granular agent supply into contact with the rotating filter such that the granular agent cleans the rotating filter by scouring the rotating filter.

13. The dishwasher of claim 12 wherein the rotating filter is located exteriorly of the tub.

14. The dishwasher of claim 13 , further comprising a structure spaced from the rotating filter to define a gap between the structure and the rotating filter.

15. The dishwasher of claim 14 wherein the granular agent supply is configured to supply the granular agent adjacent the gap.

16. The dishwasher of claim 15 wherein the structure comprises a channel and the granular agent supply is configured to supply the granular agent into the channel.

17. The dishwasher of claim 16 wherein the granular agent is in the form of magnetic balls.

18. The dishwasher of claim 17 , further comprising a magnetic field generator located relative to the channel such that one of activation and deactivation of the magnetic field either releases or captures the magnetic balls.

19. The dishwasher of claim 18 wherein the structure comprises a flow diverter that increases shear forces acting on a surface of the filter.

20. The dishwasher of claim 18 wherein the structure comprises a shroud enshrouding the filter.

21. The dishwasher of claim 12 , further comprising a reservoir for storing the granular agent.

22. The dishwasher of claim 21 wherein the reservoir comprises at least one of a chamber and a channel.

23. The dishwasher of claim 21 wherein the granular agent comprises a magnetic granular agent stored in the reservoir.

24. The dishwasher of claim 23 , further comprising a magnetic field generator that activates or deactivates a magnetic field to release or capture the magnetic granular agent from or in the reservoir.

25. The dishwasher of claim 12 , further comprising a structure spaced from the rotating filter to define a gap between the structure and the rotating filter.

26. The dishwasher of claim 25 wherein the structure comprises a channel and granular agent supply is configured to supply the granular agent into the channel.

27. The dishwasher of claim 26 wherein the structure comprises a flow diverter that increases shear forces acting on a surface of the filter.

28. The dishwasher of claim 26 wherein the structure comprises a shroud enshrouding the filter.

29. The dishwasher of claim 12 wherein the granular agent supply is configured to supply the granular agent to an upstream side of the rotating filter.

30. The dishwasher of claim 29 , further comprising a shroud enshrouding the rotating filter and the granular agent supply is configured to supply the granular agent into the shroud.

31. The dishwasher of claim 12 wherein the rotating filter comprises two filter screens spaced from each other to form a gap.

32. The dishwasher of claim 31 wherein the granular agent supply is configured to supply the granular agent into the gap.

33. The dishwasher of claim 31 , further comprising separators located within the gap to define a first area within the gap and a second area within the gap.

34. The dishwasher of claim 33 wherein the granular agent supply is configured to selectively supply the granular agent into the first area and the second area.

Assignees

• Whirlpool Co

Inventors

• Geda Jacquelyn R
• Rappette Antony M

Classifications

• B01D24/46

  Regenerating the filtering material in the filter (B01D24/44 takes precedence) · CPC title

• A47L15/4206

  Tubular filters · CPC title

• A47L15/4202

  Water filter means or strainers · CPC title

• A47L15/4208 Primary

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

• A47L15/0057

  Cleaning of machines parts, e.g. removal of deposits like lime scale or proteins from piping or tub · CPC title