JP2019019992A - Heating cooker - Google Patents

Abstract

To attain reduction of energy consumption and to attain improvement of cooking performance and user friendliness in a heating cooker configured to heat a heated object by circulating hot air inside of a heating cabinet.SOLUTION: A heating cooker comprises a heating cabinet 10, a circulation fan 14, a burner 13, temperature detection means 16 and heating control means which controls the circulation fan 14 and the burner 13. The heating cooker is configured to execute: an initial heating operation for raising a temperature inside of the heating cabinet 10 to a preheating temperature Ts by combusting the burner 13 and making a circulation quantity of air inside of the heating cabinet 10 by the circulation fan 14 to an initial circulation quantity in a pre-heating step for controlling the temperature inside of the heating cabinet 10 to the preheating temperature Ts before a heating step; and a temperature maintaining operation for maintaining the temperature inside of the heating cabinet 10 at the preheating temperature Ts by switching between operations of combusting the burner 13 and making the circulation quantity into a combustion circulation quantity, and operations of non-combusting the burner 13 and making the circulation quantity into a non-combustion circulation quantity that is lower than the combustion circulation quantity, based on a detected temperature of the temperature detection means 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooking device, and more particularly to a cooking device having an oven function for heating a heated object such as a food or a cooking container by circulating hot air in a heating chamber.

  Conventionally, the cooking exhaust gas (hot air) released from the burner is circulated in the heating chamber by a circulation fan, thereby heating cooking such as a gas oven that heats an object to be heated such as food or a cooking container stored in the heating chamber. During the preheating operation before starting the heating operation, the heating chamber is heated to a target heating temperature higher than the set temperature, thereby reducing the number of times the burner is switched between ignition and extinguishing, thereby reducing gas consumption. Are known (for example, see Patent Document 1).

JP 2009-008339 A

  However, in the above-described conventional cooking device, after the inside of the heating chamber is once heated to a target heating temperature higher than the set temperature, the temperature in the heating chamber (the temperature in the chamber) is waited for the set temperature to drop to the set temperature. Therefore, the heat energy accumulated in the heating chamber was wasted to the outside and the heat loss was large. Moreover, since it is necessary to continue burning the burner until the internal temperature reaches the target heating temperature, the gas consumption has not been sufficiently reduced.

  In addition, after starting the preheating operation, when performing the heating operation, it is necessary to wait for the internal temperature to drop from the target heating temperature to the set temperature.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a cooking device having an oven function for heating the object to be heated by circulating hot air released from the burner into a heating chamber by a circulation fan. The purpose is to reduce energy consumption and improve usability.

  The present invention relates to a heating chamber, a circulation fan that circulates air in the heating chamber, a burner that heats the air, a temperature detection means that detects the temperature in the heating chamber, and a heating control that controls the circulation fan and the burner. And a heating control means for heating an object to be heated by performing combustion and non-combustion of the burner and adjusting a circulation amount of air in the heating chamber by a circulation fan. A heating step and a preheating step for adjusting the temperature in the heating chamber to a preheating temperature before the heating step, and in the preheating step, the burner is burned and the circulation amount is set as the initial circulation amount, Based on the initial heating operation for raising the internal temperature to the preheating temperature and the temperature detected by the temperature detecting means, the burner is burned and the circulation amount is set as the combustion circulation amount, the burner is non-combusted and the circulation amount is Lower than combustion circulation rate By switching between that combustion circulation rate, and performs the temperature maintenance operation for maintaining the temperature in the heating chamber to the preheating temperature.

  In this case, if the temperature in the heating chamber reaches the preheating temperature after the preheating step is started, the gas consumption can be reduced because the temperature is quickly shifted to a temperature maintaining operation for maintaining the temperature in the heating chamber at the preheating temperature. . Moreover, since it is possible to suppress the wasteful release of thermal energy from the inside of the heating chamber until the temperature in the heating chamber reaches the preheating temperature, heat loss can also be reduced.

  Furthermore, in this case, since the heating chamber is not heated until the temperature in the preheating process becomes higher than the preheating temperature in the preheating process, the time required to start the temperature maintaining operation after the preheating process is started is shortened. it can. Therefore, the heating process can be started at an earlier stage accordingly.

  Preferably, in the temperature maintaining operation, the circulation fan is operated at a combustion rotational speed, the circulation amount is set as a combustion circulation amount, and the circulation fan is operated at a limited rotational speed lower than the combustion rotational speed, so that the circulation amount is Is the non-combustion circulation amount.

  In maintaining the temperature in the heating chamber at the preheating temperature in the preheating step, if the circulation fan is stopped, air will not convect in the heating chamber and the temperature distribution will be biased. Therefore, when the heating process is started at this time, the degree of heating varies depending on the arrangement and location of the object to be heated, which may affect the degree of completion of the dish.

  However, according to the heating cooker according to the present invention, when maintaining the temperature in the heating chamber at the preheating temperature in the preheating step, the rotation speed of the circulation fan is lowered to the limit rotation speed and the operation state is maintained. During the process, the air in the heating chamber can always be convected. Therefore, when the heating process is started, the temperature distribution in the heating chamber is not easily biased, and the object to be heated can be heated more uniformly in the heating process. Therefore, it is possible to keep the degree of completion of cooking 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 whole cooking device can be reduced. Further, since the heating process can be started at a relatively early stage after the preheating process is started, 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 operations during preheating operation and heating operation of the cooking device according to the embodiment of the present invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the heating cooker 1 according to the embodiment of the present invention circulates combustion exhaust gas (hot air) released from a burner 13 into a heating chamber 10 by a circulation fan 14, thereby It is a gas oven that heats an object to be heated F such as an internal food or cooking container. In the present specification, the depth direction of the main body case 11 when 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 heating cooker 1 and the heating cooker 1 is viewed from the front side. The front-rear direction and the width direction are referred to as the left-right direction, and the height direction is referred to as the up-down direction.

  The main body front surface 111 is connected and supported by a heated object inlet / outlet 100 for taking the heated object F into and out of the heating chamber 10 and a lower side portion of the main body case 11 so as to be pivotable back and forth. A front door 12 that closes the object entrance 100 from the front is provided.

  Inside the main body case 11, a heating chamber 10 capable of accommodating a plurality of trays 2 on which the object F to be heated F are arranged in a vertical direction and a combustion chamber 20 in which a burner 13 is disposed are provided in a vertically separated manner. Yes. In the upper part of the heating case 10 in the main body case 11, oil smoke and odor components released from the heated object F, air introduced into the heating case 10 by the circulation fan 14, etc. are opened in the upper part of the main case 11. An exhaust passage 30 leading to the exhaust port 300 is provided. A hot air passage 31 that guides the air in the heating chamber 10 and the combustion chamber 20 to the arrangement portion (fan case) 34 of the circulation fan 14 is provided at the rear portion of the heating chamber 10 in the main body case 11. The fan case 34 is provided in the rear part of the hot air passage 31.

  Although not shown, a flame detection sensor for detecting the presence or absence of a gas combustion flame at a position near the flame hole forming portion of the burner 13 in the combustion chamber 20 and an ignition plug for spark discharge at a position near the flame hole forming portion. And are provided. The main body case 11 is provided with a valve unit composed of an electromagnetic on-off valve and a heating power adjustment valve for adjusting the amount of gas supplied to the burner 13, and the amount of gas supplied to the burner 13 by the valve unit, That is, the heating power is adjusted.

  An air intake port 200 that connects the external space of the main body case 11 and the combustion chamber 20 is provided at a position below the heated object inlet / outlet port 100 in the main body front surface 111. A hot air outlet 21 connected to the hot air passage 31 is opened at the rear portion of the upper wall of the combustion chamber 20. A suction port 22 connected to the internal space of the fan case 34 is formed in the rear wall of the hot air passage 31.

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

  Accordingly, when the circulation fan 14 is rotated by operating the drive motor 15 (hereinafter referred to as “fan motor”) of the circulation fan 14, the external air of the main body case 11 is used as combustion air for 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 led from the combustion chamber 20 through the hot air outlet 21 to the hot air passage 31 and then taken into the fan case 34 through the suction port 22. Then, it is led out from the hot air outlet 23 into the heating chamber 10.

  Further, a part of the hot air led out from the hot air outlet 23 into the heating chamber 10 is led out to the hot air passage 31 from the hot air inlet 24 and then taken into the fan case 34 through the inlet 22 and again. It is derived from the hot air outlet 23 into the heating chamber 10. A part of the hot air led out into 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 outlet 300. As described above, 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 main body case is passed through the exhaust passage 30 together with the oil smoke and odor components released from the heated object F. 11 is discharged to the outside.

  At the position near the exhaust outlet 25 in the exhaust passage 30, the temperature of the air discharged from the heating chamber 10 to the exhaust passage 30 is detected as the temperature in the heating chamber 10 (hereinafter referred to as “internal temperature”). An internal temperature sensor 16 as a temperature detecting means is provided. An opening / closing switch 17 that is turned on / off in conjunction with opening / closing of the front door 12 is disposed 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 heating cooker 1, an operation switch for instructing start and stop of the operation of the heating cooker 1, and the heating cooker 1 such as heating temperature and heating time. An operation panel 18 including a setting operation switch for arbitrarily setting the operation condition, a display unit for displaying the operation state of the cooking device 1 and the set operation condition is provided.

  Inside the main body case 11, the entire heating cooker 1, such as ignition and extinguishing of the burner 13, heating power adjustment, operation and stop of the circulation fan 14, and adjustment of the rotational speed based on the operating conditions set on the operation panel 18, is provided. 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, a flame detection sensor (not shown), an igniter that applies a high voltage to the spark plug to cause a spark discharge, and the valve drive unit of the valve unit are all electric. It is connected to the control circuit 4 through wiring.

  The control circuit 4 is based on the output value of the burner 13 based on the output value of the burner control unit for igniting and extinguishing the burner 13, adjusting the heating power, the fan control unit for operating and stopping the circulation fan 14, and adjusting the rotation speed. A point fire extinguishing judgment unit for judging ignition and fire extinguishing, a chamber temperature judgment unit for judging a temperature state in the heating chamber 10 based on a temperature detected by the chamber temperature sensor 16 (hereinafter referred to as “inside chamber temperature”), an open / close switch An open / close determination unit that determines whether or not the front door 12 has been opened based on the on / off state of 17, the thermal power of the burner 13, and the circulation amount of the air in the heating chamber 10 by the circulation fan 14 are controlled. It has a circuit configuration such as a heating control unit for adjusting the temperature.

  The fan control unit detects the actual rotational speed of the circulation fan 14 by a rotational speed detection means (not shown), and the actual rotational speed becomes a set rotational speed (an ignition rotational speed, a combustion rotational speed, a limit rotational speed, etc. described later). The fan motor 15 may be controlled so as to adjust the rotational speed of the circulation fan 14, and a current value corresponding to the set rotational speed is set in advance. It may be configured to adjust the rotational speed of the circulation fan 14 by setting the drive current to the current value.

  The heating control unit heats the article to be heated F at the set heating temperature by switching between combustion and non-combustion of the burner 13 and adjusting the circulation amount of the air in the heating chamber 10 by the circulation fan 14. Before the heating step is started, the combustion in the burner 13 is switched between non-combustion and the air in the heating chamber 10 by the circulation fan 14 so that the temperature in the chamber reaches a preset preheating temperature. The operation control part of the preheating process which heats the inside of the heating chamber 10 to the preheating temperature is performed by adjusting the circulation amount.

  The operation control unit of the preheating step burns the burner 13 and operates the circulation fan 14 to set the circulation amount of the air in the heating chamber 10 to a predetermined combustion circulation amount, thereby adjusting the temperature in the heating chamber 10. An operation controller for an initial heating operation for raising the temperature to the preheating temperature, an operation for burning the burner 13 after the initial heating operation is performed and setting the circulation amount as the combustion circulation amount, and a non-combustion operation for the burner 13 and the circulation amount. The operation control part of the temperature maintenance operation | movement which maintains the temperature in the heating chamber 10 by the preheating temperature by switching the operation | movement which makes non-combustion circulation amount lower than combustion circulation amount is provided.

  The control operation of the heating cooker 1 by the control circuit 4 will be described according to the time chart of FIG. Although not shown, when the following control operation is executed, when the power is turned on with the power switch of the operation panel 18, the main control program of the heating cooker 1 incorporated in the control circuit 4 is activated. Thus, the preheating operation and the heating operation can be performed. In this state, if a setting temperature setting operation and a heating time setting operation are performed with the setting operation switch of the operation panel 18, a setting temperature (setting heating temperature) Ts and a heating time ( Set heating time) Cs is set.

  After the power is turned on as described above, when an operation for instructing the start of the preheating operation is performed by the operation switch of the operation panel 18, the inside of the heating chamber 10 is heated to the preheating temperature (here, the same as the set heating temperature). The initial heating operation of the preheating step of heating up to (temperature) Ts is started. Specifically, first, the fan motor 15 of the circulation fan 14 is operated at a predetermined ignition rotational speed (here, a strong rotational speed), and the intake of external air into the combustion chamber 20 is started. Further, spark discharge is performed 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. Thereby, the burner 13 is ignited.

  When the flame detection sensor detects ignition of the burner 13, that is, combustion flame, the fan motor 15 of the circulation fan 14 is set to a predetermined combustion rotational speed (here, the same rotational speed as the ignition rotational speed). The valve unit is adjusted to the opening degree during the initial heating operation, and the heating power of the burner 13 is set to the initial heating heating power (here, the strong heating power). Thereby, the hot air produced | generated by the burner 13 is supplied in the heating chamber 10, the hot air of a combustion circulation amount is circulated in the heating chamber 10, and the temperature in the heating chamber 10 is raised (P1).

  Note that 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 is different from the ignition rotation speed (for example, the ignition rotation speed is a weak rotation speed, The combustion rotational speed may be set to a high rotational speed). Similarly, the thermal power (initial heating thermal power) of the burner 13 during the initial heating operation is set to be the same as the thermal power during the ignition of the burner 13, but is different from the thermal power during the ignition of the burner 13 (for example, during ignition) It is good also as what was set to the low thermal power of this, and the initial heating thermal power is strong thermal power). The preheating temperature in the preheating process is set to be the same as the set heating temperature in the heating process, but a temperature different from the set heating temperature in the heating process (for example, considering a temperature drop when the front door 12 is opened). Thus, it may be set to a temperature higher than the set heating temperature Ts by a predetermined value).

  Until the internal temperature reaches the preheating temperature Ts, the rotational speed of the fan motor 15 is maintained at the combustion rotational speed, and the thermal power of the burner 13 is maintained at the initial heating thermal power. Thereafter, when the internal temperature reaches the preheating temperature Ts, the temperature maintaining operation of the preheating process for maintaining the internal temperature at the preheating temperature Ts is started. Specifically, first, if the internal temperature reaches the preheating temperature Ts, the fan motor 15 of the circulation fan 14 is set to a limited rotational speed (here, a weak rotational speed) lower than the combustion rotational speed, and the valve The unit's electromagnetic on-off valve is closed and the burner 13 is extinguished. Thereby, the supply of hot air from the burner 13 into the heating chamber 10 is stopped, and only the circulation of air having a non-combustion circulation amount lower than the combustion circulation amount is performed in the heating chamber 10.

  In addition, after the initial heating operation is started, the internal temperature reaches the preheating temperature Ts, and even after the burner 13 is extinguished, the temperature in the heating chamber 10 is further increased from the preheating temperature Ts by the retained heat. To do. However, at this time, since the circulation fan 14 is rotated at a limited rotational speed lower than the combustion rotational speed, the air in the heating chamber 10 is convected and stirred more gently than during the initial heating operation (P1). . At the same time, outside air of the main body case 11 is introduced into the heating chamber 10 through the combustion chamber 20 from the air intake port 200, and part of the air in the heating chamber 10 passes through the exhaust passage 30 in the main body case 11. It is discharged outside. For this reason, the temperature in the heating chamber 10 gradually falls before reaching a noticeably high temperature state (see the graph indicating “internal temperature” in FIG. 2).

  After that, when the internal temperature falls below the preheating temperature Ts, the circulation fan 14 is rotated again at the combustion rotational speed as described above, the burner 13 is ignited, and the same set thermal power as the initial heating thermal power (here, high fire) To burn. As described above, if the internal temperature reaches the preheating temperature Ts as a result of the initial heating operation, ignition (combustion) and extinguishing (non-combustion) of the burner 13 are performed so that the internal temperature becomes the preheating temperature Ts thereafter. ) Are repeated as appropriate, and the circulation fan 14 is operated at the combustion rotational speed in accordance with the ignition of the burner 13, and the circulation fan 14 is operated at the limited rotational speed in accordance with the extinguishing of the burner 13. Thereby, while the hot air produced | generated by the burner 13 is supplied suitably in the heating chamber 10, the circulation amount of the air in the heating chamber 10 is adjusted, and the temperature in the heating chamber 10 is maintained near the preheating temperature Ts ( P2).

  In the temperature maintaining operation, the rotational 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 supply amount of hot air into the heating chamber 10 can be secured. You may make it operate | move by the lower limit rotation speed lower than a combustion rotation speed in the range. Thereby, since it can suppress that hot air is discharged | emitted more than needed from the inside of the heating chamber 10 at the time of temperature maintenance operation | movement, a heat loss can be reduced.

  During the execution of the temperature maintaining operation, for example, when the front door 12 is opened and the open / close switch 17 is turned off to accommodate the article to be heated F in the heating chamber 10, the valve unit is promptly turned on at that time. Is closed, the burner 13 is extinguished, and the fan motor 15 is stopped. Thereby, the circulation supply of the hot air into the heating chamber 10 is stopped.

  And when accommodation of the to-be-heated material F in the heating chamber 10 is completed and the front door 12 is closed and the open / close switch 17 is turned on, the operation returns to the temperature maintaining operation, and the temperature in the heating chamber 10 is changed. The temperature is maintained near the preheating temperature Ts. That is, when the front door 12 is opened and external air flows into the heating chamber 10 and the internal temperature falls below the preheating temperature Ts, the circulation fan 14 is combusted from the time when the front door 12 is closed. While rotating at the number of rotations, the burner 13 is ignited and burned with the set heating power.

  As described above, when the object to be heated F is accommodated in the heating chamber 10 and the front door 12 is closed, when an operation for instructing the start of the heating operation is performed by the operation switch of the operation panel 18, the internal temperature The ignition (combustion) and extinguishing (non-combustion) of the burner 13 are repeated as appropriate so that the temperature reaches the set heating temperature Ts, and the circulation fan 14 is rotated at a predetermined heating rotational speed (here, the same rotational speed as the combustion rotational speed). Start the heating process, which is always activated. Thereby, while the hot air produced | generated by the burner 13 is supplied suitably in the heating chamber 10, the circulation amount of the air in the heating chamber 10 is adjusted, and the to-be-heated object F in the heating chamber 10 is heated. That is, the heating of the article to be heated F is started from a state in which 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 process is set to be the same as the combustion rotation speed, but is different from the combustion rotation speed (for example, the combustion rotation speed is a strong rotation speed, the heating rotation speed). The number may be set to a plurality of different rotational 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). May be set to a strong heating power, and a heating power during the heating process may be set to a plurality of different heating powers set based on a predetermined heating control sequence.

  Thereafter, when the elapsed time from the start of the heating process reaches the set heating time Cs, the fan motor 15 is stopped and the solenoid on / off valve of the valve unit is closed to extinguish the burner 13. Thereby, the circulation supply of the hot air into the heating chamber 10 is stopped, and the heating of the article F to be heated is finished.

  Although not shown, the main body case 11 is provided with an automatic lock 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 process is started. Until the end of the heating process and until the end of the heating process, the automatic lock device is always used except when the operation switch of the operation panel 18 is used to instruct to stop the preheating operation or the heating operation. Held in a closed state.

  Thus, according to the heating cooker 1, when the internal temperature reaches the preheating temperature Ts after the preheating step is started, the temperature maintaining operation of quickly maintaining the temperature in the heating chamber 10 at the preheating temperature Ts is performed. Since it shifts, the consumption of fuel gas during operation can be reduced. Moreover, since it is possible to suppress wasteful release of thermal energy from the inside of the heating chamber 10 until the temperature in the heating chamber 10 reaches the preheating temperature Ts, heat loss can also be reduced. Thereby, it becomes possible to aim at reduction of the energy consumption of the heating cooker 1 whole.

  Further, in this case, if the internal temperature reaches the preheating temperature Ts after the preheating process is started, the temperature is shifted to the temperature maintaining operation as it is. Therefore, the timing of starting the heating process after the completion of the initial heating operation is different. However, the heating degree of the article to be heated F hardly varies. Further, the inside of the heating chamber 10 does not significantly exceed the preheating temperature Ts and becomes a remarkably high temperature state, and it is circulated until the temperature in the heating chamber 10 reaches the preheating temperature Ts and shifts to the temperature maintenance operation. 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. Thereby, the to-be-heated material F can be heated uniformly at a heating process, and it is possible to maintain the completeness of a dish high. Therefore, cooking performance is also improved.

  In addition, since the time required from the start of the preheating process 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, in maintaining the temperature in the heating chamber 10 at the preheating temperature Ts in the preheating step, even if the heating power of the burner 13 is reduced to the limiting heating power, the rotation speed of the fan motor 15 of the circulation fan 14 is limited. Since the operating state is maintained by lowering the number of revolutions, the air in the heating chamber 10 can always be convected during the preheating step. Thereby, when the heating process is started, the temperature distribution in the heating chamber 10 is not easily biased, and the object to be heated F can be heated more uniformly in the heating process. It is possible to keep it high. Therefore, the cooking performance is further improved.

  In the embodiment described above, in the preheating process and the heating process, the case where the burner 13 is extinguished when the internal temperature exceeds the set temperature (preheat temperature or set heating temperature) Ts has been described. 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.

  In the above embodiment, in the temperature maintaining operation in the preheating step, the operation is described in which the circulation fan 14 is operated at a limited rotational speed lower than the combustion rotational speed in accordance with extinguishing the fire of the burner 13 (decreasing thermal power). The circulation fan 14 may be stopped in accordance with the fire extinguishing of the burner 13 (decrease in thermal power). In this case, since the consumption of current for driving the fan motor 15 can be suppressed, it is possible to further reduce the energy consumption.

  The present invention is not limited to the gas oven that heats the object to be heated F accommodated in the heating chamber 10 by circulating the hot air generated in the burner 13 into the heating chamber 10 by the circulation fan 14, but on the upper surface of the main body. A gas stove having one or more stove burners, a main body having a heating chamber for storing an object F to be heated, an oven burner for generating hot air, and a circulation fan for introducing and circulating the hot air into the heating chamber. It is also possible to apply to an apparatus equipped with an oven function for heating the object to be heated F by circulating hot air released from the oven burner into a heating chamber by a circulation fan.

1 Heating Cooker 10 Heating Chamber 13 Burner 14 Circulating Fan 16 Internal Temperature Sensor (Temperature Detection Means)
4 Control circuit

Claims (2)

A heating cabinet, a circulation fan that circulates air in the heating chamber, a burner that heats the air, a temperature detection means that detects the temperature in the heating cabinet, and a heating control means that controls the circulation fan and the burner. A heating 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 adjusting the circulation amount of the air in the heating chamber by the circulation fan,
A preheating step of adjusting the temperature in the heating chamber to the preheating temperature before the heating step,
In the preheating step, an initial heating operation for raising the temperature in the heating chamber to the preheating temperature by burning the burner and setting the circulation amount as the initial circulation amount;
Based on the temperature detected by the temperature detection means, the burner is burned and the circulation rate is set as the combustion circulation rate, and the burner is non-combusted and the circulation rate is set as a non-combustion circulation rate lower than the combustion circulation rate A heating cooker that performs a temperature maintaining operation to maintain the temperature in the heating chamber at the preheating temperature by switching. The heating cooker according to claim 1, wherein
In the temperature maintenance operation, the circulation fan is operated at the combustion rotation speed, the circulation amount is set as the combustion circulation amount, and the circulation fan is operated at the limited rotation speed lower than the combustion rotation speed, so that the circulation amount is non-combustion circulation. Cooker with quantity.

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