DESCALING ARRANGEMENT FOR A DISHWASHER, AND ASSOCIATED APPARATUS AND METHOD

• US 20110126861A1
• Filed: 08/23/2010
• Published: 06/02/2011
• Est. Priority Date: 08/24/2009
• Status: Abandoned Application

• Current Assignee: Electrolux Professional SPA and Ecolab Incorporated
• Original Assignee: Electrolux Professional SPA and Ecolab Incorporated
• Inventors: Frascati, Giuliano, Armellin, Daniele, Dorigo, Roberto, Kahlhamer, Jason Andrew, Henneman, Bryan John, Colonnello, Fabio, Vortali, Gianmarco, Morgan, Christopher Daniel, Wiltsie, Ben Jeremiah, Jensen, Andrew Michael, Molinaro, Alessandro, Salton, Fabrizio
• Application Number:
  US12/861,337
• Publication Number:
  US 20110126861A1
• Time in Patent Office: Days
• US Class Current: 134/22.1
• 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 15/0084 of drawer-type
• CPC Class Codes: A47L 15/241 the dishes moving in a horizontal plane
• CPC Class Codes: A47L 2401/20 Time, e.g. elapsed operating time
• CPC Class Codes: A47L 2401/22 Number of operational cycles
• CPC Class Codes: A47L 2501/07 Consumable products, e.g. detergent, rinse aids or salt
• CPC Class Codes: A47L 2501/26 Indication or alarm to the controlling device or to the user

Abstract

A descaling arrangement for a dishwasher and an associated apparatus are provided. The dishwasher has a tub portion adapted to receive dishware therein, and a fluid circulation system configured to circulate dishwashing fluid about the dishware within the tub portion. A descale system is in fluid communication with the fluid circulation system. The descale system is configured to selectively introduce a descaling substance into dishwashing fluid circulated within the fluid circulation system such that the descaling substance is distributed to at least one of the tub portion and the fluid circulation system for descaling thereof. An associated method is also provided.

Claims

1. A descaling arrangement for a dishwasher having a tub portion adapted to receive dishware therein, the dishwasher further having a fluid circulation system adapted to circulate dishwashing fluid about the dishware within the tub portion, the descaling arrangement comprising:

a descale system adapted to be in fluid communication with the fluid circulation system, the descale system being configured to selectively introduce a descaling substance into dishwashing fluid circulated within the fluid circulation system such that the descaling substance is distributed to at least one of the tub portion and the fluid circulation system for descaling thereof.

2. A descaling arrangement according to claim 1, wherein the descaling substance comprises one of a decalcifying, a deliming liquid substance, a solution created from a decalcifying solid substance, and a solution created from a deliming solid substance.

3. A descaling arrangement according to claim 1, wherein the descale system comprises a descaling substance reservoir and a dispensing pump assembly in fluid communication therewith, the dispensing pump assembly being configured to direct the descaling substance contained in the descaling substance reservoir to the fluid circulation system.

4. A dishwasher, comprising:

a tub portion adapted to receive dishware therein;

a fluid circulation system configured to circulate dishwashing fluid about the dishware within the tub portion; and

a descale system in fluid communication with the fluid circulation system, the descale system being configured to selectively introduce a descaling substance into dishwashing fluid circulated within the fluid circulation system such that the descaling substance is distributed to at least one of the tub portion and the fluid circulation system for descaling thereof.

5. A dishwasher according to claim 4, wherein the descaling substance comprises one of a decalcifying, a deliming liquid substance, a solution created from a decalcifying solid substance, and a solution created from a deliming solid substance.

6. A dishwasher according to claim 4, wherein the fluid circulation system includes a water supply valve adapted to fluidly connect the fluid circulation system to a house water supply line, the descale system being in fluid communication with the fluid circulation system downstream from the water supply valve with respect to the flow direction of dishwashing fluid entering the fluid circulation system.

7. A dishwasher according to claim 6, wherein the fluid circulation system and the descale system connect in fluid communication at a descaling substance introduction point, and the fluid circulation system further comprises an anti-backflow device disposed between the descaling substance introduction point and the water supply valve to prevent backflow of the descaling substance into the house water supply line.

8. A dishwasher according to claim 4, wherein the fluid circulation system includes a washing fluid circuit configured to circulate, via at least one wash water distribution provision of the washing fluid circuit, wash water having a detergent substance carried thereby about the dishware within the tub portion, the fluid circulation system further having a rinse fluid circuit discrete from the washing fluid circuit, the rinse fluid circuit being configured to circulate, via at least one rinse water distribution provision of the rinse fluid circuit, heated rinse water about the dishware within the tub portion, the descale system being in fluid communication with the rinse fluid circuit.

9. A dishwasher according to claim 8, wherein the rinse fluid circuit of the fluid circulation system comprises a heating unit configured to heat dishwashing fluid moving through the rinse fluid circuit, the descale system being disposed upstream from the heating unit with respect to the flow direction of dishwashing fluid entering the fluid circulation system.

10. A dishwasher according to claim 4, further comprising a controller device configured to direct a plurality of automatic dishwasher programs to be executed by the dishwasher, including an automatic descaling program whereby the controller device is configured to selectively control introduction of the descaling substance into the fluid circulation system.

11. A dishwasher according to claim 10, wherein the fluid circulation system comprises a dilution sensor in communication with the controller device, the dilution sensor being configured to determine a descaling substance dilution level indicative of an amount of descaling substance present in the dishwashing fluid circulating through the fluid circulation system.

12. A dishwasher according to claim 10, wherein the descale system comprises a dispensing pump assembly in fluid communication with a descaling substance reservoir, the dispensing pump assembly being in communication with the controller device and being configured to direct the descaling substance contained in the descaling substance reservoir to the fluid circulation system.

13. A dishwasher according to claim 12, wherein the descale system further comprises a descaling substance level sensor in communication with the controller device, the descaling substance level sensor being adapted to interact with the descaling substance contained in the descaling substance reservoir and being configured to determine a descaling substance level status indicative of the amount of the descaling substance in the descaling substance reservoir.

14. A dishwasher according to claim 4, further comprising at least one rack member disposed within the tub portion, the rack member being configured to receive dishware therein and being movable into and out of the tub portion.

15. A dishwasher according to claim 4, further comprising a rack conveyor system in operable communication with the tub portion, the rack conveyor system being configured to automatically transport dishware in and out of the tub portion.

16. A dishwasher according to claim 4, wherein the fluid circulation system further comprises a mixing chamber for facilitating fluid communication between the fluid circulation system and the descale system, the mixing chamber being adapted to receive dishwashing fluid from a house water supply line and to receive the descaling substance from the descale system such that the descaling substance is capable of being mixed with the dishwashing fluid.

17. A method of descaling at least one of a tub portion and a fluid circulation system of a dishwasher, the fluid circulation system being configured to circulate dishwashing fluid about dishware received within the tub portion, the method comprising:

selectively introducing a descaling substance via a descale system into dishwashing fluid circulating within the fluid circulation system such that the descaling substance is carried by the dishwashing fluid throughout the fluid circulation system, the descale system being in fluid communication with the fluid circulation system; and

circulating the dishwashing fluid and the descaling substance carried thereby within at least one of the tub portion and the fluid circulation system for descaling thereof.

18. A method according to claim 17, wherein selectively introducing a descaling substance further comprises selectively introducing a descaling substance comprising one of a decalcifying, a deliming liquid substance, a solution created from a decalcifying solid substance, and a solution created from a deliming solid substance.

19. A method according to claim 17, wherein selectively introducing a descaling substance via a descale system further comprises selectively introducing a descaling substance via a descale system disposed downstream, with respect to the flow direction of dishwashing fluid entering the fluid circulation system, from a water supply valve adapted to fluidly connect the fluid circulation system to a house water supply line.

20. A method according to claim 17, wherein circulating the dishwashing fluid and the descaling substance carried thereby further comprises circulating the dishwashing fluid and the descaling substance carried thereby within a washing fluid circuit of the fluid circulation system and a rinse fluid circuit of the fluid circulation system, the washing fluid circuit being configured to circulate wash water having a detergent substance carried thereby about the dishware within the tub portion, the rinse fluid circuit being configured to circulate heated rinse water about the dishware within the tub portion, and the rinse fluid circuit being discrete from the washing fluid circuit and in fluid communication with the descale system such that the descaling substance is introduced into the rinse fluid circuit.

21. A method according to claim 20, further comprising heating the dishwashing fluid moving through the rinse fluid circuit and carrying the descaling substance such that the heated rinse water carrying the descaling substance is circulated about the tub portion for descaling thereof.

22. A method according to claim 17, further comprising actuating via a controller device an automatic descaling program to be executed by the dishwasher, whereby the controller device is configured to selectively control introduction of the descaling substance into the fluid circulation system.

23. A method according to claim 22, further comprising determining a descaling substance dilution level via a dilution sensor in communication with the controller device, the descaling substance dilution lever being indicative of an amount of descaling substance present in the dishwashing fluid circulating through the fluid circulation system.

24. A method according to claim 22, wherein selectively introducing a descaling substance via a descale system further comprises selectively introducing a descaling substance via a descale system comprising a dispensing pump assembly in fluid communication with a descaling substance reservoir, the dispensing pump assembly being configured to direct the descaling substance stored in the descaling substance reservoir to the fluid circulation system, as directed by the controller device.

25. A method according to claim 24, further comprising determining a descaling substance level status via a descaling substance level sensor in communication with the controller device and configured to interact with the descaling substance contained in the descaling substance reservoir, the descaling substance level status being indicative of the amount of the descaling substance in the descaling substance reservoir.

26. A method according to claim 17, wherein circulating the dishwashing fluid and the descaling substance carried thereby within at least one of the tub portion and the fluid circulation system further comprises circulating the dishwashing fluid and the descaling substance carried thereby within at least one of the fluid circulation system and the tub portion having at least one rack member disposed therewithin, the rack member being configured to receive dishware therein and being movable into and out of the tub portion.

27. A method according to claim 17, wherein circulating the dishwashing fluid and the descaling substance carried thereby within at least one of the tub portion and the fluid circulation system further comprises circulating the dishwashing fluid and the descaling substance carried thereby within at least one of the fluid circulation system and the tub portion having a rack conveyor system in operable communication therewith, the rack conveyor system being configured to automatically transport dishware in and out of the tub portion.

28. A method according to claim 17, selectively introducing a descaling substance via a descale system into dishwashing fluid moving within the fluid circulation system further comprises selectively introducing a descaling substance via a descale system into dishwashing fluid moving within the fluid circulation system having a mixing chamber for facilitating fluid communication between the fluid circulation system and the descale system, the mixing chamber being adapted to receive dishwashing fluid from a house water supply line and to receive the descaling substance from the descale system such that the descaling substance is capable of being mixed with the dishwashing fluid.