Combination drain system for multizone oven

1. A multi-cavity oven comprising:

a housing defining an interior volume subdivided by horizontally extending thermal and humidity barriers into multiple cooking cavities including a lowermost cooking cavity, an intermediate cooking cavity, and an upper cooking cavity, each cooking cavity supporting different cooking temperatures and humidities, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;

a steam generator system introducing steam into selective cooking cavities of the multiple cooking cavities according to an electric signal;

a set of fans circulating the steam independently through each of the cooking cavities in isolation from the other cooking cavities;

an air outlet extending from each of the cooking cavities to conduct the steam out of each cooking cavity to ambient air; and

a drain port of each of the cooking cavities to conduct liquid received at a bottom of each of the cooking cavities out of the cooking cavities.

2. A multi-cavity oven comprising:

a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures and humidities, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;

a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier out of the at least one upper cooking cavity;

a lower drain to conduct liquid received at a bottom wall of the lowermost cooking cavity out of the lowermost cooking cavity;

a set of fans circulating steam independently through the cooking cavities in isolation from the other cooking cavities;

an air outlet extending from each cooking cavity to conduct the steam out of each cooking cavity to ambient air;

wherein each drain port is separated from the other drain ports and the lower drain by at least one backflow limiter being at least one pool of water blocking the free flow of gas into and out of the respective cavities.

3. The multi-cavity oven of claim 2 wherein the thermal barriers are movable to allow adjustment of a size of at least one cooking cavity to be used during operation of the oven.

4. The multi-cavity oven of claim 2 wherein the drain ports connect to a common drain receptacle of cooling water positioned below the lowermost cooking cavity.

5. The multi-cavity oven of claim 4 wherein the common drain receptacle includes a grease trap.

6. The multi-cavity oven of claim 4 wherein the lower drain extends vertically through a bottom wall of the lowermost cooking cavity to a backflow limiter to the common drain receptacle.

7. The multi-cavity oven of claim 2 wherein the thermal barriers also provide humidity barriers, the multi-cavity oven further including a steam generator system introducing steam into selective cooking cavities according to an electric signal.

8. The multi-cavity oven of claim 7 wherein each cavity provides a separate heater and a thermal sensor; and

further including a controller receiving a user command to independently set temperature and humidity of the different cooking cavities.

9. The multi-cavity oven of claim 2 wherein each of the cooking cavities is a module providing independent upper and lower walls, wherein the modules are adapted to be received within a common cabinet having a single door.

10. The multi-cavity oven of claim 2 wherein each of the air outlets is connected to separate electronically controlled valves which are opened and closed according to an electronic signal.

11. The multi-cavity oven of claim 2 further comprising a condenser receiving the steam from the air outlets and cooling the steam prior to the steam entering the ambient air.

12. A multi-cavity oven comprising:

a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures and humidities, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;

a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier out of the at least one upper cooking cavity;

a lower drain to conduct liquid received at a bottom wall of the lowermost cooking cavity out of the lowermost cooking cavity;

a set of fans circulating steam independently through the cooking cavities in isolation from the other cooking cavities;

an air outlet extending from each cooking cavity to conduct the steam out of each cooking cavity to ambient air;

upper and lower jet plates positioned above and below each cavity, the upper and lower jet plates providing separate upwardly and downwardly projecting air jets respectively communicating with a common fan of each cooking cavity;

wherein each drain port is separated from the other drain ports and the lower drain by at least one backflow limiter being at least one pool of water blocking the free flow of gas into and out of the respective cavities.

13. The multi-cavity oven of claim 12 wherein the drain ports connect to a common drain receptacle of cooling water positioned below the lowermost cooking cavity.

14. The multi-cavity oven of claim 13 wherein the common drain receptacle includes a grease trap.

15. The multi-cavity oven of claim 13 wherein the lower drain extends vertically through a bottom wall of the lowermost cooking cavity to a backflow limiter to the common drain receptacle.

16. A multi-cavity oven comprising:

a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;

a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier to the drain port;

a set of fans circulating air independently through the cooking cavities in isolation from the other cooking cavities; and

upper and lower jet plates positioned above and below each cavity, the upper and lower jet plates providing separate upwardly and downwardly projecting air jets respectively communicating with different fans wherein the lower jet plate is sized to provide a channel between vertical walls of the oven volume and the lower jet plate along an upper surface of a lower wall of the cavity to the drain port.

17. The multi-cavity oven of claim 16 wherein the channel slopes toward the drain port.