A conveyor oven having a first mode of operation and a second mode of operation is provided. The conveyor oven generally includes an oven chamber in which food is cooked, a conveyor moveable to convey the food through the oven chamber, a burner to generate heat for the oven chamber, the burner havin
A conveyor oven having a first mode of operation and a second mode of operation is provided. The conveyor oven generally includes an oven chamber in which food is cooked, a conveyor moveable to convey the food through the oven chamber, a burner to generate heat for the oven chamber, the burner having a combustion airflow rate, at least one blower to circulate air within the oven chamber, and a controller. The blower operates at a first speed during the first mode of operation and at a second speed that is faster than the first speed during the second mode of operation. The controller is responsive to at least one of a burner output and an internal temperature of the oven chamber, and adjusts the combustion airflow rate based in part on at least one of the burner output and the internal temperature of the oven chamber.
대표청구항▼
1. A conveyor oven comprising: an oven chamber in which food is cooked;a conveyor moveable to convey the food through the oven chamber;a gas burner to generate a heat output to the oven chamber, the gas burner having an adjustable gas flow rate;a combustion blower for supplying air to the gas burner
1. A conveyor oven comprising: an oven chamber in which food is cooked;a conveyor moveable to convey the food through the oven chamber;a gas burner to generate a heat output to the oven chamber, the gas burner having an adjustable gas flow rate;a combustion blower for supplying air to the gas burner, wherein the combustion blower generates a combustion blower airflow rate;at least one air-circulating blower to circulate air within the oven chamber, wherein the at least one air-circulating blower operates between at least two different positive air-circulating speeds;a temperature sensor within the oven that generates temperature signals indicating an oven temperature; anda controller that receives the temperature signals generated by the temperature sensor, andin response to the received temperature signals indicating a change in oven cooking temperature is configured to set the combustion blower airflow rate from a first positive airflow rate to a second positive airflow rate to maintain a continuous positive combustion blower airflow rate while food is being cooked, andis configured to set the air-circulating speed of the at least one air-circulating blower from a first positive air-circulating speed in a first mode of operation during operation of the oven at less than a cooking temperature to a faster second positive air-circulating speed in a programmable period of time for cooking in a second mode of operation. 2. The conveyor oven of claim 1, wherein the controller adjusts the gas flow rate over a range of operation in response to the received temperature signals indicating a change in oven cooking temperature. 3. The conveyor oven of claim 1, wherein the controller adjusts the combustion blower airflow rate and the gas flow rate to maintain a substantially constant ratio between the combustion blower airflow rate and the gas flow rate over a range of heat outputs from the burner. 4. The conveyor oven of claim 1, further comprising a valve to adjust the combustion blower airflow rate. 5. The conveyor oven of claim 1, wherein the combustion blower airflow rate is increased from a first positive airflow rate to a second positive airflow rate in response to the received temperature signals indicating a need for more heat output from the burner. 6. The conveyor oven of claim 1, wherein the heat output of the burner is adjusted from a first positive heat output to a second positive heat output to maintain a constant positive heat output while food is being cooked in response to the received temperature signals indicating a change in oven cooking temperature. 7. The conveyor oven of claim 4, further comprising a valve to adjust the burner gas flow rate, wherein the valve to adjust the combustion blower airflow rate and the valve to adjust the burner gas flow rate are operable to maintain a substantially constant amount of excess air in the burner during high and low heating load periods. 8. The conveyor oven of claim 1, wherein the at least one air-circulating blower is a first air-circulating blower, the conveyor oven further comprising a second air-circulating blower, and wherein the first and the second air-circulating blowers are separately adjustable to create two different heating zones in the oven chamber. 9. The conveyor oven of claim 8, wherein the oven is equipped with two or more temperature sensors to individually monitor and adjust the two different heating zones. 10. The conveyor oven of claim 1, wherein the oven is equipped with two or more temperature sensors and the controller is configured to vary the interpretation of the temperature signals received from the two or more temperature sensors to suit the food product. 11. The conveyor oven of claim 1, wherein the at least one air-circulating blower is a first air-circulating blower, the conveyor oven further comprising a second air-circulating blower, and wherein during the programmable period of time the air-circulating speed of only one air-circulating blower of the first and second air-circulating blowers is set from the first air-positive air circulating speed to the faster second positive air-circulating speed. 12. The conveyor oven of claim 1, wherein the at least one air-circulating blower is a first air-circulating blower, the conveyor oven further comprising a second air-circulating blower, and wherein during the programmable period of time the air-circulating speeds of both the first and second air-circulating blowers are set from the first air-positive air circulating speed to the faster second positive air-circulating speed. 13. The conveyor oven of claim 1, wherein during the programmable period of time the temperature of the oven chamber is increased from the first mode of operation to the second mode of operation. 14. The conveyor oven of claim 1, wherein the programmable period of time is an oven start-up mode. 15. The conveyor oven of claim 1, wherein the air-circulating speed of the at least one air-circulating blower is set from the first positive air-circulating speed to the faster second positive air-circulating speed after a desired heat output or oven temperature has been achieved. 16. The conveyor oven of claim 1, further comprising a third mode of operation in which the at least one air-circulating blower is shut down. 17. The conveyor oven of claim 16, wherein the at least one air-circulating blower is not shut down until the oven temperature drops below a threshold temperature. 18. The conveyor oven of claim 1, wherein the first mode of operation is a self-cleaning mode. 19. The conveyor oven of claim 1, wherein the combustion blower airflow rate is decreased in response to the received temperature signals indicating a need for less heat output from the burner. 20. A conveyor oven comprising: an oven chamber in which food is cooked;a conveyor moveable to convey the food through the oven chamber;a gas burner to generate a heat output to the oven chamber, the gas burner having an adjustable gas flow rate;a combustion blower for supplying air to the gas burner, wherein the combustion blower generates a combustion blower airflow rate;first and second air-circulating blowers to circulate air within the oven chamber, wherein each of the first and second air-circulating blowers operates between at least two different positive air-circulating speeds and each of the first and second air-circulating blowers is separately adjustable to create different heating zones in the oven chamber;a temperature sensor within the oven that generates temperature signals indicating an oven temperature; anda controller that receives the temperature signals generated by the temperature sensor, andin response to the received temperature signals indicating a change in oven cooking temperature is configured to set the combustion blower airflow rate from a first positive airflow rate to a second positive airflow rate to maintain a continuous positive combustion blower airflow rate while food is being cooked, andis configured to set the air-circulating speed of at least one of the first and second air-circulating blowers from a first positive air-circulating speed in a first mode of operation during operation of the oven at less than a cooking temperature to a faster second positive air-circulating speed in a programmable period of time for cooking in a second mode of operation, andwherein during the programmable period of time the temperature of the oven chamber is increased from the first mode of operation to the second mode of operation.
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