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

• US 9,757,008 B2
• Filed: 03/22/2017
• Issued: 09/12/2017
• Est. Priority Date: 10/23/2012
• Status: Active Grant

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Geda, Jacquelyn R., Rappette, Antony M.
• Primary Examiner(s): Kornakov, Michael
• Assistant Examiner(s): COLEMAN, RYAN L
• Application Number:
  US15/465,708
• Publication Number:
  US 20170188783A1
• Time in Patent Office: 174 Days
• Field of Search: None
• CPC Class Codes: A47L 15/0057 Cleaning of machines parts, e.g. removal of deposits like lime scale or proteins from piping or tub
• CPC Class Codes: A47L 15/4202 Water filter means or strainers
• CPC Class Codes: A47L 15/4206 Tubular filters
• CPC Class Codes: A47L 15/4208 Arrangements to prevent clogging of the filters, e.g. self-cleaning
• CPC Class Codes: A47L 15/4225 Arrangements or adaption of recirculation or discharge pumps
• CPC Class Codes: B01D 24/46 Regenerating the filtering material in the filter B01D24/44 takes precedence

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.

Claims

1. A method of cleaning a rotating filter located within a liquid circuit of a household appliance such that liquid flows through the rotating filter to effect a filtering of the liquid, the method comprising:

passing liquid through the liquid circuit of the household appliance;

rotating the filter during the passing of the liquid, wherein the rotating filter comprises two filter elements spaced from each other to form a gap; and

scouring the rotating filter by introducing a granular agent into the liquid circuit during the passing of the liquid and the rotating of the filter such that the granular agent becomes entrained within the liquid and contacts the rotating filter and wherein the granular agent is maintained adjacent at least a portion of the rotating filter during the scouring.

2. The method of claim 1 wherein the passing of liquid comprises recirculating the liquid through the liquid circuit.

3. The method of claim 2 wherein the recirculating the liquid comprises recirculating the liquid through a dish treating chamber.

4. The method of claim 1 wherein the two filter elements form a hollow body.

5. The method of claim 1 wherein introducing the granular agent into the liquid circuit comprises introducing the granular agent into the gap.

6. The method of claim 1 wherein introducing the granular agent comprises introducing a granular agent with at least some grains being greater in size than openings in at least one of the two filter elements.

7. The method of claim 1 wherein introducing the granular agent comprises introducing a granular agent that is dissolvable within the liquid.

8. The method of claim 1 wherein introducing the granular agent comprises introducing a granular agent that is not dissolvable within the liquid.

9. The method of claim 1, further comprising removing the granular agent from the liquid circuit after introducing the granular agent.

10. The method of claim 9, further comprising storing the removed granular agent for reintroduction.

11. The method of claim 9 wherein the granular agent comprises magnetic particles and the introducing or removing of the granular agent comprises applying or removing a magnetic field from the magnetic particles.

12. A method of cleaning a rotating filter provided within a liquid flow in a household appliance, the method comprising:

scouring the rotating filter of the household appliance, wherein the rotating filter comprises two filter elements spaced from each other to form a gap, by introducing a granular agent into the gap during at least one of a rotating or a passing of liquid through the rotating filter.

13. The method of claim 12 wherein the passing of liquid comprises recirculating the liquid.

14. The method of claim 13 wherein the recirculating the liquid comprises recirculating the liquid through a dish treating chamber.

15. The method of claim 12 wherein the granular agent is maintained within the gap during the scouring.

16. The method of claim 12 wherein the two filter elements form a hollow body.

17. The method of claim 12 wherein introducing the granular agent comprises introducing a granular agent with at least some grains being greater in size than openings in at least one of the two filter elements.

18. The method of claim 12 wherein introducing the granular agent comprises introducing a granular agent that is dissolvable within the liquid.

19. The method of claim 12 wherein introducing the granular agent comprises introducing a granular agent that is not dissolvable within the liquid.

20. The method of claim 12, further comprising removing the granular agent after the introducing of the granular agent.

21. The method of claim 20, further comprising storing the removed granular agent for reintroduction.

22. The method of claim 20 wherein the granular agent comprises magnetic particles and the introducing or removing of the granular agent comprises applying or removing a magnetic field from the magnetic particles.