Self-cleaning filtration system for a dishwasher

Patent metadata

Field	Value
Publication number	US-10448801-B2
Application number	US-201615073478-A
Country	US
Kind code	B2
Filing date	Mar 17, 2016
Priority date	Mar 17, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A dishwasher filtration system includes a coarse filter disposed in a tub of a dishwasher, the coarse filter configured to filter water directed to a main wash pump. The system also includes a soil accumulation chamber configured to receive a portion of water from the main wash pump. The system further includes a fine filter covering an opening of the soil accumulation chamber, the fine filter configured to filter the portion of water received inside the soil accumulation chamber. The system also includes a backwash nozzle configured to supply water to the fine filter. In addition, the system may include a deflector that deflects the water from the backwash nozzle to the fine filter.

First claim

What is claimed is:

1. A dishwasher filtration system comprising:
a coarse filter disposed in a tub of a dishwasher, the coarse filter configured to filter water directed to a main wash pump;
a soil accumulation chamber configured to receive a portion of water from the main wash pump;
a fine filter covering an opening of the soil accumulation chamber, the fine filter configured to filter the portion of water received inside the soil accumulation chamber;
a washing arm configured to linearly traverse between a back of the tub and a front of the tub;
a backwash nozzle configured to supply water towards the washing arm to provide continuous cleaning of the fine filter;
a wash nozzle configured to supply water towards the washing arm from a same direction as the backwash nozzle; and
a deflector mounted on the washing arm and configured to deflect the water from the backwash nozzle in an opposite direction from a deflection of water from the wash nozzle.

2. The system of claim 1 , wherein the deflector is configured to deflect the water supplied horizontally from the backwash nozzle downward to the fine filter.

3. The system of claim 2 , wherein the washing arm is configured to traverse laterally back and forth across a majority of the tub.

4. The system of claim 3 , wherein the fine filter is cleaned using water from the backwash nozzle in a linear operation that coincides with the lateral traversal of the washing arm.

5. The system of claim 4 , wherein the water from the backwash nozzle sprays a front surface of the fine filter and passes through the fine filter, thereby dislodging particles lodged on a back surface of the fine filter.

6. The system of claim 1 , wherein the fine filter and the soil accumulation chamber comprise part of a rail that is configured to guide lateral traversal of the washing arm.

7. The system of claim 1 , wherein the fine filter and the soil accumulation chamber are disposed in a bottom surface of the tub of the dishwasher.

8. The system of claim 1 , further comprising:
a first valve configured to control a percentage of water flow to the soil accumulation chamber; and
a second valve configured to control a percentage of water flow to the backwash nozzle.

9. The system of claim 1 , wherein water flow out of the soil accumulation chamber is at least partially controlled by a drain valve configured to drain water from the soil accumulation chamber without draining water from the tub of the dishwasher.

10. A dishwasher comprising:
a tub;
a main wash pump;
a coarse filter disposed in the tub, the coarse filter configured to filter water directed to the main wash pump;
a soil accumulation chamber configured to receive a portion of water from the main wash pump;
a fine filter covering an opening of the soil accumulation chamber, the fine filter configured to filter the portion of water received inside the soil accumulation chamber;
a washing arm configured to linearly traverse between a back of the tub and a front of the tub;
a backwash nozzle configured to supply water towards the washing arm to provide continuous cleaning of the fine filter;
a wash nozzle configured to supply water towards the washing arm from a same direction as the backwash nozzle; and
a deflector mounted on the washing arm and configured to deflect water from the backwash nozzle in an opposite direction from a deflection of water from the wash nozzle.

11. The dishwasher of claim 10 , wherein the deflector is configured to deflect the water supplied horizontally from the backwash nozzle downward to the fine filter.

12. The dishwasher of claim 11 , wherein the washing arm is configured to traverse laterally back and forth across a majority of the tub.

13. The dishwasher of claim 12 , wherein the fine filter is cleaned using water from the backwash nozzle in a linear operation that coincides with the lateral traversal of the washing arm.

14. The dishwasher of claim 13 , wherein the water from the backwash nozzle sprays a front surface of the fine filter and passes through the fine filter, thereby dislodging particles lodged on a back surface of the fine filter.

15. The dishwasher of claim 10 , wherein the fine filter and the soil accumulation chamber comprise part of a rail that is configured to guide lateral traversal of the washing arm.

16. The dishwasher of claim 10 , wherein the fine filter and the soil accumulation chamber are disposed in a bottom surface of the tub.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Vaidhyanathan Raveendran
• Thies Edward
• Kopyrin Viktor

Classifications

• B01D29/688

  with backwash arms or shoes acting on the cake side · CPC title

• A47L15/4208 Primary

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

• A47L15/4278

  Nozzles · CPC title

• A47L15/4217

  Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops · CPC title

• B01D29/904

  directing the mixture to be filtered on the filtering element in a manner to clean the filter continuously (B01D29/115, B01D29/118, B01D29/17, B01D29/25, B01D29/336, B01D29/356, B01D29/902, B01D29/908 take precedence) · CPC title