Self-cleaning convection oven

• US 8,193,470 B1
• Filed: 09/08/2009
• Issued: 06/05/2012
• Est. Priority Date: 09/08/2008
• Status: Expired due to Fees

• Current Assignee: KFC Corporation (Yum! Brands Incorporated)
• Original Assignee: KFC Corporation (Yum! Brands Incorporated)
• Inventors: Harlamert, Michael E., Rabas, Jiri, Elwell, Eric S., Gregory, Brett J., Kaiser, Lawrence R., Halpin, Mark
• Primary Examiner(s): PELHAM, JOSEPH MOORE
• Application Number:
  US12/555,498
• Time in Patent Office: 1,001 Days
• Field of Search: None
• US Class Current: 219/401
• CPC Class Codes: F24C 14/005 using a cleaning liquid

Abstract

A self-cleaning convection oven includes a cabinet defining an interior cavity for cooking a food product; a door moveable between an open position and a closed position for allowing access to the interior cavity; one or more heating elements positioned in the interior cavity for delivering heat to the interior cavity; a fan positioned within the interior cavity; and a plumbing system operably connected to a water supply for delivering water into the interior cavity of the oven through a first nozzle positioned near the fan. The plumbing system of the self-cleaning convection oven further also delivers a cleaning solution into the interior cavity of the oven.

Claims

1. A self-cleaning oven, comprising:

a cabinet defining an interior cavity for cooking a food product;

a door moveable between an open position and a closed position for allowing access to the interior cavity;

one or more heating elements positioned in the interior cavity for delivering heat to the interior cavity;

a fan positioned within the interior cavity near the one or more heating elements for circulating heated air within the interior cavity during normal cooking operations;

a first nozzle positioned in the interior cavity of the oven outside of and above the fan, the first nozzle aimed at a periphery of the fan; and

a plumbing system operably connected to a water supply for delivering water into the interior cavity of the oven through the first nozzle, such that, as part of a self-cleaning operation, water is discharged onto the periphery of the fan for distribution throughout the interior cavity of the oven.

2. The self-cleaning oven as recited in claim 1, in which the plumbing system includes a water solenoid valve, such that when the water solenoid valve is open, water is delivered from the water supply to the first nozzle.

3. The self-cleaning oven as recited in claim 1, in which the plumbing system also delivers a cleaning solution into the interior cavity of the oven.

4. The self-cleaning oven as recited in claim 3, in which the cleaning solution is delivered to the interior cavity of the oven through a second nozzle positioned outside of and above the fan.

5. The self-cleaning oven as recited in claim 3, in which the plumbing system includes a pump for drawing the cleaning solution from a storage receptacle.

6. The self-cleaning oven as recited in claim 5, in which the cleaning solution drawn from the storage receptacle is mixed with an effluent draining from the interior cavity of the oven through a drain, thus creating a mixture of the cleaning solution and the effluent that is then delivered into the interior cavity of the oven.

7. The self-cleaning oven as recited in claim 6, in which the mixture of the cleaning solution and the effluent is delivered to the interior cavity of the oven through a second nozzle positioned outside of and above the fan.

8. The self-cleaning oven as recited in claim 7, in which the plumbing system includes a recirculation pump that is positioned between the second nozzle and the drain for circulating the mixture of the cleaning solution and the effluent.

9. The self-cleaning oven as recited in claim 8, in which the plumbing system further includes a recirculation solenoid valve positioned between the recirculation pump and the second nozzle, wherein the recirculation solenoid valve is closed during normal cooking operations to prevent hot air from the interior cavity of the oven from circulating through the plumbing system.

10. The self-cleaning oven as recited in claim 6, in which the plumbing system includes a cross connector for mixing the cleaning solution with the effluent draining from the interior cavity of the oven through the drain.

11. The self-cleaning oven as recited in claim 10, in which the plumbing system includes a water solenoid valve, such that when the water solenoid valve is open, water is delivered from the water supply to the first nozzle.

12. The self-cleaning oven as recited in claim 11, in which the plumbing system further includes a quench solenoid valve, such that, when the quench solenoid valve is open, water is delivered from the water supply to the cross connector.

13. A method for cleaning an oven having a cabinet defining an interior cavity for cooking a food product, a door moveable between an open position and a closed position for allowing access to the interior cavity, one or more heating elements positioned in the interior cavity for delivering heat to the interior cavity, and a fan positioned within the interior cavity for circulating heated air within the interior cavity during normal cooking operations, the method comprising the steps of:

placing the door in the closed position;

activating the fan; and

delivering water into the interior cavity of the oven through a first nozzle positioned outside of and above the fan, the first nozzle aimed at a periphery of the fan, such that water is discharged onto the periphery of the fan for distribution throughout the interior cavity of the oven.

14. The method for cleaning an oven as recited in claim 13, and further comprising the step of:

delivering a cleaning solution into the interior cavity of the oven through a second nozzle positioned outside of and above the fan, such that the cleaning solution is distributed throughout the interior cavity of the oven.

15. A method for cleaning an oven having a cabinet defining an interior cavity for cooking a food product, a door moveable between an open position and a closed position for allowing access to the interior cavity, one or more heating elements positioned in the interior cavity for delivering heat to the interior cavity, and a fan positioned within the interior cavity for circulating heated air within the interior cavity during normal cooking operations, the method comprising the steps of:

placing the door in the closed position;

activating the fan;

initiating a pre-rinse phase by opening a drain valve associated with a drain from the interior cavity of the oven, and opening a water solenoid valve for a predetermined time period to discharge water through a first nozzle outside of and above the fan, the first nozzle aimed at a periphery of the fan, such that water is discharged onto the periphery of the fan for distribution throughout the interior cavity of the oven;

initiating a filling phase by closing the drain valve, while the water solenoid valve remains open for a predetermined time period to fill the interior cavity of the oven with a volume of water; and

initiating a wash phase by energizing a recirculation pump for a predetermined time period while the drain valve remains closed, which pumps an effluent from the interior cavity that passes through the drain, mixes the effluent with a specified amount of a cleaning solution in a cross connector to create a mixture of the cleaning solution and the effluent, and then delivers the mixture to the interior cavity of the oven through a second nozzle positioned outside of and above the fan.

16. The method for cleaning an oven as recited in claim 15, wherein said oven further includes a quench solenoid valve, such that, when the quench solenoid valve is open, water is delivered from the water supply to the cross connector, and further comprising the steps of:

initiating a rinse phase by opening the drain valve, de-energizing the recirculation pump, and then opening the water solenoid valve and the quench solenoid valve for a predetermined time period to deliver water through the first nozzle and the second nozzle and into the interior cavity of the oven;

initiating a pump filling phase by closing the drain valve and closing the quench solenoid valve, while the water solenoid valve remains open to fill the interior cavity of the oven with a predetermined amount of water;

initiating a purging phase by closing the water solenoid valve and energizing the recirculation pump;

initiating a final rinse phase by de-energizing the recirculation pump, opening the drain valve, and then opening the water solenoid valve and the quench solenoid valve for a predetermined time period; and

initiating a flushing phase by closing the water solenoid valve, while the quench solenoid valve remains open, thus allowing water to flow through the recirculation pump and associated tubing.

17. A self-cleaning oven, comprising:

a cabinet defining an interior cavity for cooking a food product;

a door moveable between an open position and a closed position for allowing access to the interior cavity;

one or more heating elements positioned in the interior cavity for delivering heat to the interior cavity;

a fan positioned within the interior cavity near the one or more heating elements for circulating heated air within the interior cavity during normal cooking operations;

a first nozzle positioned in the interior cavity of the oven outside of and above the fan, the first nozzle aimed at a periphery of the fan;

a second nozzle positioned in the interior cavity of the oven outside of and above the fan; and

a plumbing system that (i) is operably connected to a water supply for delivering water into the interior cavity of the oven through the first nozzle, such that, as part of a self-cleaning operation, water is discharged onto the periphery of the fan for distribution throughout the interior cavity of the oven, (ii) includes a pump for drawing a cleaning solution from a storage receptacle, and (iii) mixes the cleaning solution drawn from the storage receptacle with an effluent draining from the interior cavity of the oven through a drain, thus creating a mixture of the cleaning solution and the effluent that is then delivered into the interior cavity of the oven through the second nozzle as part of the self-cleaning operation.

18. The self-cleaning oven as recited in claim 17, in which the plumbing system includes a cross connector for mixing the cleaning solution with the effluent draining from the interior cavity of the oven through the drain.