JP6948857B2 - Cooker - Google Patents

Description

The present invention relates to a cooker, particularly a cooker having an oven function of circulating hot air in a heating chamber to heat an object to be heated such as foodstuffs and cooking containers.

Conventionally, by circulating the combustion exhaust gas (hot air) emitted from the burner into the heating chamber by a circulation fan, cooking such as a gas oven that heats the foodstuffs and the objects to be heated such as the cooking container stored in the heating chamber is cooked. By heating the inside of the oven to the target heating temperature higher than the set temperature during the preheating operation before starting the heating operation, the number of times to switch between ignition and extinguishing of the burner is reduced, and gas consumption is reduced. Is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2009-008339

However, in the above-mentioned conventional heating cooker, after heating the inside of the heating chamber to a target heating temperature higher than the set temperature, the inside of the heating chamber waits for the temperature inside the heating chamber (inside the chamber temperature) to drop to the set temperature. During this period, the heat energy stored in the heating chamber was wasted and wasted to the outside, resulting in a large heat loss. In addition, since it is necessary to continue burning the burner until the temperature inside the refrigerator reaches the target heating temperature, the gas consumption has not been sufficiently reduced.

Moreover, since it is necessary to wait for the temperature inside the refrigerator to drop from the target heating temperature to the set temperature when performing the heating operation after the start of the preheating operation, there is a problem that the heating operation cannot be started promptly.

The present invention has been made in view of the above problems, and an object of the present invention is a cooker having an oven function in which hot air released from a burner is circulated in a heating chamber by a circulation fan to heat an object to be heated. The purpose is to reduce energy consumption and improve usability.

The present invention includes a heating chamber, a circulation fan that circulates air in the heating chamber, a burner that heats the air, a temperature detecting means that detects the temperature in the heating chamber, and heating control that controls the circulation fan and the burner. A heating cooker provided with means, the heating control means heats an object to be heated by burning and non-burning a burner and adjusting the circulation amount of air in a heating chamber by a circulation fan. It has a heating step and a preheating step of adjusting the temperature inside the heating chamber to the preheating temperature before the heating step. In the preheating step, the burner is burned and the circulation amount is set as the initial circulation amount. An initial heating operation that raises the temperature inside to the preheating temperature, and after the initial heating operation , the burner is burned and the circulation amount is set as the combustion circulation amount based on the detection temperature of the temperature detecting means, and the burner is set as non-burning. Further, by switching between setting the circulation amount to a non-combustion circulation amount lower than the combustion circulation amount, a temperature maintenance operation for maintaining the temperature in the heating chamber at the preheating temperature is performed.

In this case, if the temperature in the heating chamber reaches the preheating temperature after the preheating process is started, the temperature in the heating chamber is promptly shifted to the temperature maintenance operation for maintaining the temperature in the heating chamber at the preheating temperature, so that the gas consumption can be reduced. .. Further, since it is possible to suppress unnecessary heat energy from being released from the heating chamber before the temperature in the heating chamber reaches the preheating temperature, heat loss can also be reduced.

Further, in this case, since the inside of the heating chamber is not heated until the temperature becomes higher than the preheating temperature in the preheating step, the time required from the start of the preheating step to the transition to the temperature maintenance operation is shortened. can. Therefore, the heating process can be started at an earlier stage.

Preferably, in the temperature maintenance operation, the circulation fan is operated at the combustion speed to set the circulation amount as the combustion circulation amount, and the circulation fan is operated at the limit rotation speed lower than the combustion speed to obtain the circulation amount. Is the non-combustion circulation amount.

If the circulation fan is stopped in maintaining the temperature inside the heating chamber at the preheating temperature in the preheating step, air will not convection in the heating chamber and the temperature distribution will be biased. Therefore, when the heating step is started at this point, the degree of heating varies depending on the arrangement and portion of the object to be heated, which may affect the degree of completion of cooking.

However, according to the heating cooker according to the present invention, when the temperature inside the heating chamber is maintained at the preheating temperature in the preheating step, the rotation speed of the circulation fan is lowered to the limit rotation speed to maintain the operating state, so that the preheating is maintained. During the process, the air in the heating chamber can be kept convected at all times. Therefore, when the heating step is started, the temperature distribution in the heating chamber is less likely to be biased, and the object to be heated can be heated more uniformly in the heating step. Therefore, it is possible to keep the degree of perfection of the dish higher.

As described above, according to the present invention, the gas consumption can be reduced and the heat loss can be reduced, so that the energy consumption of the entire cooking cooker can be reduced. Further, since the heating process can be started at a relatively early stage after the preheating process is started, the usability is improved.

FIG. 1 is a schematic configuration diagram of a cooking device according to an embodiment of the present invention. FIG. 2 is a time chart showing the preheating operation and the operation during the heating operation of the cooking cooker according to the embodiment of the present invention.

Next, the above-described embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in the cooking apparatus 1 according to the embodiment of the present invention, the combustion exhaust gas (hot air) discharged from the burner 13 is circulated in the heating chamber 10 by the circulation fan 14, so that the heating chamber 10 is used. It is a gas oven that heats the foodstuff inside and the object to be heated F such as a cooking container. In the present specification, the front surface of the main body case 11 (hereinafter referred to as "front surface of the main body") 111 is the front surface of the cooking cooker 1, and the depth direction of the main body case 11 when the cooking cooker 1 is viewed from the front side is defined. The front-back direction and width direction are called the left-right direction, and the height direction is called the up-down direction.

The front surface 111 of the main body is connected and supported by an entrance / exit 100 for the object to be heated for moving the object F in and out of the heating chamber 10 in a state where it can rotate back and forth around the lower side portion of the main body case 11, and is heated. A front door 12 is provided to close the entrance / exit 100 from the front.

Inside the main body case 11, a heating chamber 10 capable of accommodating a plurality of trays 2 on which the object to be heated F is placed side by side and a combustion chamber 20 in which the burner 13 is arranged are vertically separated from each other. There is. In the upper part of the heating chamber 10 in the main body case 11, oil smoke and odor components discharged from the object F to be heated, air introduced into the heating chamber 10 by the circulation fan 14, and the like are opened in the upper part of the main body case 11. An exhaust passage 30 leading to the exhaust port 300 is provided. At the rear of the heating chamber 10 in the main body case 11, a hot air passage 31 is provided to guide the air in the heating chamber 10 and the combustion chamber 20 to the arrangement portion (fan case) 34 of the circulation fan 14. The fan case 34 is provided at the rear of the hot air passage 31.

Although not shown, a flame detection sensor that detects the presence or absence of a gas combustion flame and an ignition plug that discharges sparks near the flame hole forming portion in the combustion chamber 20 are located near the flame hole forming portion of the burner 13. And are provided. Further, in the main body case 11, a valve unit including an electromagnetic on-off valve and a thermal power adjusting valve for adjusting the amount of gas supplied to the burner 13 is provided, and the amount of gas supplied to the burner 13 by the valve unit. That is, the thermal power is adjusted.

An air intake port 200 that communicates the external space of the main body case 11 with the combustion chamber 20 is provided at a position below the entrance / exit 100 of the object to be heated on the front surface 111 of the main body. A hot air outlet 21 connected to a hot air passage 31 is provided at the rear of the upper wall of the combustion chamber 20. A suction port 22 connected to the internal space of the fan case 34 is provided on the rear wall of the hot air passage 31.

On the rear wall of the heating chamber 10, a hot air outlet 23 connected to the internal space of the fan case 34 and a hot air suction port 24 connected to the hot air passage 31 are provided. An exhaust outlet 25 connected to the exhaust passage 30 is provided on the upper wall of the heating chamber 10.

Therefore, when the drive motor (hereinafter referred to as "fan motor") 15 of the circulation fan 14 is operated to rotate the circulation fan 14, the external air of the main body case 11 is used as the combustion air of the burner 13 from the air intake port 200. In addition to being taken into the combustion chamber 20, the hot air generated by the burner 13 is guided from the combustion chamber 20 to the hot air passage 31 through the hot air outlet 21, and then further taken into the fan case 34 through the suction port 22. , It is led out from the hot air outlet 23 into the heating chamber 10.

Further, the hot air led out from the hot air outlet 23 into the heating chamber 10 is partially led out from the hot air suction port 24 to the hot air passage 31, and then taken into the fan case 34 through the suction port 22 and again. It is led out from the hot air outlet 23 into the heating chamber 10. Further, a part of the hot air led out in the heating chamber 10 is led out from the exhaust outlet 25 to the exhaust passage 30, and then discharged to the outside of the main body case 11 through the exhaust port 300. In this way, the hot air generated by the burner 13 is circulated between the heating chamber 10 and the fan case 34, and a part of the hot air is circulated through the exhaust passage 30 together with the oil smoke and the odor component released from the object F to be heated. It is discharged to the outside of 11.

At a position near the exhaust outlet 25 in the exhaust passage 30, the temperature of the air discharged from the heater 10 into the exhaust passage 30 is detected as the temperature inside the heater 10 (hereinafter referred to as “internal temperature”). An internal temperature sensor 16 is provided as a temperature detecting means. An open / close switch 17 that turns on / off in conjunction with the opening / closing of the front door 12 is arranged at a position facing the front door 12 on the front surface 111 of the main body.

On the front surface 111 of the main body, there is a power switch for turning on / off the power of the cooking cooker 1, an operation switch for instructing the start and stop of the operation of the cooking cooker 1, and the heating temperature and the heating time of the cooking cooker 1. An operation panel 18 including a setting operation switch for arbitrarily setting the operating conditions, a display unit for displaying the operating state of the cooking cooker 1 and the set operating conditions, and the like is provided.

Inside the main body case 11, the entire cooking cooker 1 is ignited and extinguished based on the operating conditions set on the operation panel 18, the heating power is adjusted, the circulation fan 14 is operated and stopped, and the rotation speed is adjusted. A control circuit 4 for controlling the operation is incorporated.

The fan motor 15, the internal temperature sensor 16, the open / close switch 17, the operation panel 18, the flame detection sensor (not shown), the igniter that applies a high voltage to the spark plug to discharge sparks, the valve drive part of the valve unit, etc. are all electric. It is connected to the control circuit 4 through wiring.

The control circuit 4 is a burner control unit that ignites, extinguishes, and adjusts the thermal power of the burner 13, a fan control unit that operates or stops the circulation fan 14, adjusts the rotation speed, and the burner 13 based on the output value of the flame detection sensor. Point for determining ignition or extinguishing Fire extinguishing determination unit, internal temperature determination unit for determining the temperature state in the heating chamber 10 based on the detection temperature of the internal temperature sensor 16 (hereinafter referred to as "internal temperature"), open / close switch The opening / closing determination unit for determining whether or not the front door 12 is opened based on the on / off state of 17, the thermal power of the burner 13 and the circulation amount of air in the heating chamber 10 by the circulation fan 14 are controlled in the heating chamber 10. It has a circuit configuration such as a heating control unit that adjusts the temperature.

The fan control unit detects the actual rotation speed of the circulation fan 14 by a rotation speed detecting means (not shown), and the actual rotation speed becomes the set rotation speed (ignition rotation speed, combustion rotation speed, limit rotation speed, etc., which will be described later). The fan motor 15 may be configured to adjust the rotation speed of the circulation fan 14 by controlling the fan motor 15, or the current value corresponding to the set rotation speed is set in advance, and the fan motor 15 The rotation speed of the circulation fan 14 may be adjusted by setting the drive current of the above current value.

The heating control unit heats the object F to be heated at a set heating temperature by switching between combustion and non-combustion of the burner 13 and adjusting the circulation amount of air in the heating chamber 10 by the circulation fan 14. The operation control unit of the burner 13 and the burner 13 are switched between combustion and non-combustion so that the temperature inside the refrigerator becomes a preset preheating temperature before the heating process is started, and the air in the heater 10 by the circulation fan 14 is used. It is provided with an operation control unit for a preheating process that heats the inside of the heating chamber 10 to a preheating temperature by adjusting the circulation amount of the above.

The operation control unit of the preheating step burns the burner 13 and operates the circulation fan 14 to set the circulation amount of air in the heating chamber 10 to a predetermined combustion circulation amount, thereby adjusting the temperature in the heating chamber 10. The operation control unit of the initial heating operation that raises the temperature to the preheating temperature, the operation of burning the burner 13 and using the circulation amount as the combustion circulation amount after the execution of the initial heating operation, and the non-combustion and the circulation amount of the burner 13. It is provided with an operation control unit of a temperature maintenance operation for maintaining the temperature in the heating chamber 10 at the preheating temperature by switching the operation of setting the non-combustion circulation amount lower than the combustion circulation amount.

The control operation of the cooker 1 by the control circuit 4 will be described with reference to the time chart of FIG. Although not shown, when the power switch of the operation panel 18 is used to turn on the power when the following control operations are executed, the main control program of the cooker 1 incorporated in the control circuit 4 is activated. Then, the preheating operation and the heating operation become feasible. In this state, if the setting operation switch of the operation panel 18 is used to set the set temperature and the heating time during the heating operation, the set temperature (set heating temperature) Ts and the heating time (set heating temperature) Ts during the heating operation and the heating time ( Set heating time) Cs is set.

After the power is turned on as described above, when an operation instructing the start of the preheating operation is performed by the operation switch on the operation panel 18, the preheating temperature (here, the same as the set heating temperature) is set in the heating chamber 10. Temperature) The initial heating operation of the preheating step of heating to Ts is started. Specifically, first, the fan motor 15 of the circulation fan 14 is operated at a predetermined ignition rotation speed (here, a strong rotation speed) to start taking in external air into the combustion chamber 20. Further, the spark is discharged from the spark plug, the valve unit is adjusted to the opening degree at the time of ignition, and an amount of fuel gas suitable for ignition is supplied to the burner 13. As a result, the burner 13 is ignited.

When the ignition of the burner 13 is detected by the flame detection sensor, that is, when a combustion flame is detected, the fan motor 15 of the circulation fan 14 is set to a predetermined combustion rotation speed (here, the same rotation speed as the ignition rotation speed). , The valve unit is adjusted to the opening degree at the time of the initial heating operation, and the thermal power of the burner 13 is set to the initial heating thermal power (here, high thermal power). As a result, the hot air generated by the burner 13 is supplied into the heating chamber 10, and the hot air of the combustion circulation amount is circulated in the heating chamber 10 to raise the temperature in the heating chamber 10 (P1).

The rotation speed (combustion rotation speed) of the fan motor 15 during the initial heating operation is set to be the same as the ignition rotation speed, but the rotation speed is different from the ignition rotation speed (for example, the ignition rotation speed is a weak rotation speed. The combustion speed may be set to (strong speed). Similarly, the thermal power of the burner 13 during the initial heating operation (initial heating thermal power) is set to be the same as the thermal power at the time of ignition of the burner 13, but is different from the thermal power at the time of ignition of the burner 13 (for example, at the time of ignition). The thermal power of is set to low thermal power, and the initial heating thermal power is set to high thermal power). Further, the preheating temperature in the preheating step is set to be the same as the set heating temperature in the heating step, but considers a temperature different from the set heating temperature in the heating step (for example, a temperature drop when the front door 12 is opened). It may be set to a temperature higher than the set heating temperature Ts by a predetermined value).

Until the temperature inside the refrigerator reaches the preheating temperature Ts, the rotation speed of the fan motor 15 is maintained at the combustion rotation speed, and the thermal power of the burner 13 is maintained at the initial heating thermal power. After that, when the temperature inside the refrigerator reaches the preheating temperature Ts, the temperature maintenance operation of the preheating step for maintaining the temperature inside the refrigerator at the preheating temperature Ts is started. Specifically, first, if the temperature inside the refrigerator reaches the preheating temperature Ts, the fan motor 15 of the circulation fan 14 is set to a limit rotation speed lower than the combustion speed (here, a weak rotation speed), and a valve is used. The electromagnetic on-off valve of the unit is closed to extinguish the burner 13. As a result, the supply of hot air from the burner 13 into the heating chamber 10 is stopped, and only the non-combustion circulation amount of air, which is lower than the combustion circulation amount, is circulated in the heating chamber 10.

Even after the internal temperature reaches the preheating temperature Ts after the initial heating operation is started and the burner 13 is extinguished, the temperature inside the heating chamber 10 further rises from the preheating temperature Ts due to the internal heat. do. However, at this time, since the circulation fan 14 is rotated at a limit rotation speed lower than the combustion rotation speed, the air in the heating chamber 10 is convected and agitated more gently than during the initial heating operation (P1). .. At the same time, the outside air of the main body case 11 is introduced into the heating chamber 10 from the air intake port 200 through the combustion chamber 20, and a part of the air in the heating chamber 10 is introduced into the main body case 11 through the exhaust passage 30. It is discharged to the outside. Therefore, the temperature inside the heating chamber 10 gradually drops before becoming a remarkable high temperature state (see the graph showing the “inside temperature” in FIG. 2).

After that, when the temperature inside the refrigerator falls below the preheating temperature Ts, the circulation fan 14 is rotated again at the combustion speed as described above, and the burner 13 is ignited to set the same thermal power as the initial heating thermal power (here, high heat). Burn with force). As a result of performing the initial heating operation in this way, if the temperature inside the refrigerator reaches the preheating temperature Ts, the burner 13 is ignited (combusted) and extinguished (non-combusted) so that the temperature inside the refrigerator becomes the preheating temperature Ts thereafter. ) Is repeated as appropriate, and the circulation fan 14 is operated at the combustion speed in accordance with the ignition of the burner 13, and the circulation fan 14 is operated at the limit rotation speed in accordance with the extinguishing of the burner 13. As a result, the hot air generated by the burner 13 is appropriately supplied to the heating chamber 10, and the circulation amount of air in the heating chamber 10 is adjusted to maintain the temperature in the heating chamber 10 near the preheating temperature Ts (). P2).

In the temperature maintenance operation, the rotation speed of the circulation fan 14 when the burner 13 is ignited is within a range that does not affect the combustion performance of the burner 13, and a sufficient amount of hot air supplied into the heating chamber 10 can be secured. In the range, it may be operated at a lower limit rotation speed lower than the combustion speed. As a result, it is possible to prevent the hot air from being discharged from the heating chamber 10 more than necessary during the temperature maintenance operation, so that the heat loss can be reduced.

During the execution of the temperature maintenance operation, for example, when the front door 12 is opened and the open / close switch 17 is turned off in order to accommodate the object F to be heated in the heating chamber 10, the valve unit is promptly turned off at that time. The electromagnetic on-off valve of the above is closed to extinguish the burner 13 and stop the fan motor 15. As a result, the circulation supply of hot air into the heating chamber 10 is stopped.

Then, when the accommodation of the object to be heated F in the heating chamber 10 is completed, the front door 12 is closed and the open / close switch 17 is turned on, the temperature maintenance operation is returned to the above-mentioned temperature maintenance operation, and the temperature in the heating chamber 10 is adjusted. It is maintained near the preheating temperature Ts. That is, when the external air flows into the heating chamber 10 due to the opening of the front door 12 and the internal temperature falls below the preheating temperature Ts, the circulation fan 14 is burned from the time when the front door 12 is closed. While rotating at the number of revolutions, the burner 13 is ignited and burned at the set thermal power.

When the object F to be heated is housed in the heating chamber 10 as described above, the front door 12 is closed, and then the operation switch on the operation panel 18 is used to instruct the start of the heating operation, the temperature inside the chamber is high. Ignition (combustion) and fire extinguishing (non-combustion) of the burner 13 are appropriately repeated so that the set heating temperature Ts is reached, and the circulation fan 14 is operated at a predetermined heating rotation speed (here, the same rotation speed as the combustion rotation speed). The heating process, which is always operated, is started. As a result, the hot air generated by the burner 13 is appropriately supplied to the heating chamber 10, the circulation amount of air in the heating chamber 10 is adjusted, and the object F to be heated in the heating chamber 10 is heated. That is, the heating of the object F to be heated is started from a state where the temperature in the heating chamber 10 is close to the set heating temperature Ts (P3).

The rotation speed (heating rotation speed) of the fan motor 15 in the heating step is set to be the same as the combustion rotation speed, but the rotation speed is different from the combustion rotation speed (for example, the combustion rotation speed is a strong rotation speed and the heating rotation speed). The number may be set to a plurality of different rotation speeds) set based on a predetermined heating control sequence. Similarly, the thermal power (set thermal power) of the burner 13 in the heating process is set to be the same as the thermal power during the temperature maintenance operation in the preheating process, but is different from the thermal power during the temperature maintenance operation (for example, during the temperature maintenance operation). The thermal power of the above may be set to a high thermal power, and the thermal power in the heating step may be set to a plurality of different thermal powers set based on a predetermined heating control sequence.

After that, when the elapsed time from the start of the heating step reaches the set heating time Cs, the fan motor 15 is stopped and the electromagnetic on-off valve of the valve unit is closed to extinguish the burner 13. As a result, the circulation supply of hot air into the heating chamber 10 is stopped, and the heating of the object F to be heated is completed.

Although not shown, the main body case 11 is provided with an automatic locking device that holds the front door 12 in a closed state, and the front door 12 ends after the initial heating operation in the preheating step is started. Until, and from the start to the end of the heating process, the automatic lock device is always used, except when the operation switch on the operation panel 18 is used to instruct the preheating operation or the stop of the heating operation. It is held in the closed state.

As described above, according to the heating cooker 1, if the temperature inside the refrigerator reaches the preheating temperature Ts after the preheating step is started, the temperature inside the heating chamber 10 is quickly maintained at the preheating temperature Ts. Since the transition is made, the consumption of fuel gas during operation can be reduced. Further, since it is possible to suppress wasteful release of heat energy from the heating chamber 10 until the temperature in the heating chamber 10 reaches the preheating temperature Ts, heat loss can also be reduced. This makes it possible to reduce the energy consumption of the entire cooking device 1.

Further, in this case, if the temperature inside the refrigerator reaches the preheating temperature Ts after the preheating process is started, the temperature maintenance operation is started as it is. Therefore, the time when the heating process is started after the completion of the initial heating operation is different. However, the degree of heating of the object to be heated F is unlikely to vary. Further, the inside of the heating chamber 10 does not significantly exceed the preheating temperature Ts and becomes a remarkable high temperature state, and circulation is performed from the time when the temperature inside the heating chamber 10 reaches the preheating temperature Ts until the temperature maintenance operation is started. Since the fan 14 is always operated, there is no significant bias in the temperature distribution in the heating chamber 10 when the heating process is started. As a result, the object F to be heated can be uniformly heated in the heating step, and the degree of perfection of cooking can be maintained high. Therefore, the cooking performance is also improved.

Further, since the time required from the start of the preheating process to the transition to the temperature maintenance operation can be shortened, the entire heating time does not become redundant, and the heating process can be started at a relatively early stage. .. Therefore, usability is also improved.

In particular, in this case, when the temperature in the heating chamber 10 is maintained at the preheating temperature Ts in the preheating step, the rotation speed of the fan motor 15 of the circulation fan 14 is limited even if the thermal power of the burner 13 is reduced to the limiting thermal power. Since the operating state is maintained by lowering the rotation speed, the air in the heating chamber 10 can be constantly convected during the preheating process. As a result, when the heating step is started, the temperature distribution in the heating chamber 10 is less likely to be biased, and the object F to be heated can be heated more uniformly in the heating step, so that the degree of perfection of cooking can be improved. It is possible to keep it high. Therefore, the cooking performance is further improved.

In the above embodiment, in the preheating step and the heating step, when the temperature inside the refrigerator exceeds the set temperature (preheating temperature or the set heating temperature) Ts, the burner 13 is extinguished. When the temperature exceeds the set temperature Ts, the opening degree of the valve unit may be adjusted to reduce the thermal power of the burner 13 to a limited thermal power (for example, weak thermal power) smaller than the set thermal power.

Further, in the above embodiment, in the temperature maintenance operation of the preheating step, the circulation fan 14 is operated at a limit rotation speed lower than the combustion speed in accordance with the fire extinguishing (reduction of thermal power) of the burner 13. The circulation fan 14 may be stopped in accordance with the extinguishing of the burner 13 (decrease in thermal power). In this case, since the consumption of the current for driving the fan motor 15 can be suppressed, the energy consumption can be further reduced.

The present invention is not limited to the gas oven that heats the object to be heated F housed in the heating chamber 10 by circulating the hot air generated by the burner 13 in the heating chamber 10 by the circulation fan 14, but also on the upper surface of the main body. A gas stove having one or more stoves, a heating chamber that houses the object F to be heated, an oven burner that generates hot air, and a circulation fan that introduces the hot air into the heating chamber and circulates it. The hot air discharged from the oven burner is circulated in the heating chamber by a circulation fan to heat the object F to be heated.

1 Heat cooker 10 Heater 13 Burner 14 Circulation fan 16 Temperature sensor (temperature detection means)
4 Control circuit

Claims (2)

A heating chamber, a circulation fan for circulating air in the heating chamber, a burner for heating the air, a temperature detecting means for detecting the temperature in the heating chamber, and a heating control means for controlling the circulation fan and the burner are provided. It ’s a cooker
The heating control means includes a heating step of heating the object to be heated by performing combustion and non-combustion of the burner and adjustment of the circulation amount of air in the heating chamber by a circulation fan.
It has a preheating step that adjusts the temperature inside the heating chamber to the preheating temperature before the heating step.
In the preheating step, an initial heating operation is performed in which the temperature inside the heating chamber is raised to the preheating temperature by burning the burner and setting the circulation amount as the initial circulation amount.
After the initial heating operation , the burner is burned and the circulation amount is set as the combustion circulation amount based on the detection temperature of the temperature detecting means, and the burner is set to non-combustion and the circulation amount is lower than the combustion circulation amount. A heating cooker that performs a temperature maintenance operation that maintains the temperature inside the heating chamber at the preheating temperature by switching between. In the cooking apparatus according to claim 1,
In the temperature maintenance operation, the circulation fan is operated at the combustion speed to set the circulation amount as the combustion circulation amount, and the circulation fan is operated at the limit rotation speed lower than the combustion speed to make the circulation amount non-combustion circulation. The amount of the cooker.

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