JP6934341B2 - Cooker - Google Patents

Description

The present invention relates to a heating cooker, particularly a heating cooker having a function of limiting the operation of the heating means when the door of the heating chamber is opened.

Conventionally, in a heating cooker such as a gas oven that supplies hot air generated by a heating means into a heating chamber and heats foodstuffs in the heating chamber or an object to be heated such as a cooking container, it is linked to opening and closing the door of the heating chamber. It is known that it has an open / close switch that turns on and off, and has a function of limiting the operation of the heating means when the door is opened and the open / close switch is turned off during the heating operation (for example, a patent). (See Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2013-64589 Japanese Unexamined Patent Publication No. 2016-52390

However, in the above-mentioned conventional heating cooker, when the open / close switch cannot be turned off due to a failure or sticking, that is, when it is not possible to properly detect that the door has been opened, the door opens during the heating operation. Even if this happens, the operation limiting function of the heating means does not work, and the high-temperature hot air in the heating chamber continues to flow out from the inlet / outlet of the object to be heated to the outside of the main body. This may cause significant discomfort to the user. Further, if electrical components such as an operation switch and a display panel are provided on the peripheral edge of the entrance / exit of the object to be heated, the electrical components and the control board may be exposed to hot air for a long time, resulting in deformation or failure.

If a plurality of open / close switches are provided as in the heating cooker described in Patent Document 1, even if an abnormality occurs in one open / close switch, the open / close of the door can be detected by the other open / close switch. The number of parts increases by that amount, and a configuration for distinguishing which open / close switch on / off state accurately detects the opening / closing of the door is also required. Therefore, the structure of the entire cooking cooker becomes complicated.

The present invention has been made in view of the above problems, and an object of the present invention is a relatively simple configuration in a heating cooker having a function of limiting the operation of the heating means when the door of the heating chamber is opened. The purpose is to prevent problems caused by poor door open detection.

In the present invention, a heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means for heating the inside of the heating chamber, an opening / closing detecting means for detecting an open / closed state of the door, and an open / closed detecting means for the door. A heating cooker provided with a heating control means for limiting the heating operation of the heating means when is detected to be in the open state, and a monitoring means for detecting a specific state change of the heating means and opening / closing. When the monitoring means detects a state change of a heating cooker or more in a state where the door is detected to be closed by the detecting means, the detection failure determining means for determining the opening / closing detection failure of the door by the open / close detecting means. And an air supply means for introducing air outside the main body, the monitoring means is an air supply temperature detecting means for detecting the temperature of the air introduced by the air supply means, and the air supply means and the air supply temperature. The detection means is housed in a space provided above the heating chamber, and an air intake port for introducing external air into the space is provided above the inlet / outlet of the object to be heated in the heating chamber. The detection failure determining means opens the door when the open / close detecting means detects that the door is closed and the detection temperature of the supply air temperature detecting means shows an increase change of a predetermined time or more in a predetermined time. It is determined that the opening / closing detection of the door by the open / close detection means that has not detected the open state is defective.

In this case, although the door is detected to be closed by the open / close detecting means, the door is opened when the monitoring means detects a change in the state of the cooking cooker more than a predetermined value. Since it is determined that the open / close detection means does not accurately detect the state, that is, the door open / close detection failure by the open / close detection means, it is not necessary to provide a plurality of open / close detection means, and the open / close detection failure is ensured. It can also be detected in.

In this case, when the door is opened during the heating operation and the hot air in the heating chamber flows out from the inlet / outlet of the object to be heated to the outside of the main body, the hot air is discharged from the air intake port by the air supply means. Is taken into the space above the heating chamber that houses the. Therefore, if the detection temperature of the supply air temperature detecting means shows an increase change of a predetermined time or more in a predetermined time even though the door is detected to be closed by the opening / closing detecting means, the opening / closing detecting means It is judged that the door opening is not detected properly. As a result, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection defect by using an existing monitoring means.

As another embodiment, the present invention includes a heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means for heating the inside of the heating chamber, and an opening / closing detecting means for detecting an open / closed state of the door. A heating cooker provided with a heating control means that limits the heating operation of the heating means when the door is detected to be in the open state by the open / close detecting means, and detects a specific state change of the heating cooker. When the monitoring means detects that the door is closed by the monitoring means and the opening / closing detecting means, and the monitoring means detects a change in the state of the heating cooker by a predetermined value or more, it is determined that the opening / closing detecting means has failed to detect the opening of the door. The monitoring means is an internal temperature detecting means for detecting the temperature in the heating chamber, and the detecting defective determining means is a state in which the door is detected to be closed by the open / close detecting means. Therefore, when the detection temperature of the internal temperature detecting means shows a drop change of a predetermined value or more, it can be determined that the door opening detection failure by the opening / closing detecting means is defective.

When the door is opened during the heating operation, the hot air in the heating chamber flows out from the inlet / outlet of the object to be heated to the outside of the main body, and the air outside the main body flows into the heating chamber to lower the temperature inside the heating chamber. Therefore, if the detection temperature of the internal temperature detecting means shows a drop change of a predetermined value or more even though the door is detected to be closed by the opening / closing detecting means, the opening / closing detecting means of the door. Judged as open detection failure. As a result, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection defect by using an existing monitoring means.

Further, as another embodiment, the present invention includes a heating chamber having an inlet / outlet for an object to be heated, a door for closing the entrance / exit, a heating means for heating the inside of the heating chamber, and an opening / closing detecting means for detecting an open / closed state of the door. A heating cooker provided with a heating control means for limiting the heating operation of the heating means when the door is detected to be in the open state by the open / close detecting means, and a specific state change of the heating cooker can be detected. When the monitoring means detects that the door is closed by the detecting means and the opening / closing detecting means, and the monitoring means detects a change in the state of the cooking cooker more than a predetermined value, the opening / closing detecting means fails to detect the opening of the door. The monitoring means is a weight detecting means for detecting the weight of the object to be heated housed in the heating chamber, and the detection failure determining means has a door closed by the open / close detecting means. When the detection value of the weight detecting means shows a change of a predetermined time or more in a predetermined time in the state where it is detected, it can be determined that the door opening detection failure by the opening / closing detecting means is performed.

In this case, even though the door is detected to be closed by the open / close detecting means, if the detection value of the weight detecting means changes more than a predetermined time in a predetermined time, the door is opened. Assuming that the object to be heated has been taken out from the heating chamber or the object to be heated is contained in the heating chamber, it is determined that the door opening detection failure by the open / close detecting means is performed. As a result, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection defect by using an existing monitoring means.

Further, as another embodiment, the present invention includes a heating chamber having an inlet / outlet for an object to be heated, a door for closing the entrance / exit, a heating means for heating the inside of the heating chamber, and an opening / closing detecting means for detecting an open / closed state of the door. A heating cooker provided with a heating control means for limiting the heating operation of the heating means when the door is detected to be in the open state by the open / close detecting means, and a specific state change of the heating cooker can be detected. When the monitoring means detects that the door is closed by the detecting means and the opening / closing detecting means, and the monitoring means detects a change in the state of the cooking cooker more than a predetermined value, the opening / closing detecting means fails to detect the opening of the door. The monitoring means is a humidity detecting means for detecting the humidity in the heating chamber, and the detecting failure determining means is a state in which the door is detected to be closed by the open / close detecting means. Therefore, when the detected humidity of the humidity detecting means shows a drop change of a predetermined time or more in a predetermined time, it can be determined that the door opening detection failure by the opening / closing detecting means is defective.

When the door is opened during the heating operation, the air in the heating chamber containing a large amount of water vapor flows out from the inlet / outlet of the object to be heated to the outside of the main body, and the humidity in the heating chamber is lowered. Therefore, if the humidity detected by the humidity detecting means shows a descent change of a predetermined time or more in a predetermined time even though the door is detected to be closed by the opening / closing detecting means, the door by the opening / closing detecting means is used. It is judged that the opening detection failure of. As a result, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection defect by using an existing monitoring means.

Preferably, in the heating cooker, the heating control means prohibits the heating operation of the heating means when the detection failure determining means determines the open detection failure.

In this case, if it is determined that the opening detection is poor during the heating operation of the heating means, the heating operation can be prohibited, so that the hot air continues to flow out from the inlet / outlet of the object to be heated to the outside of the main body promptly. Can be stopped.

As described above, according to the present invention, it is possible to detect the opening / closing detection failure of the door with a relatively simple configuration, and if the heating operation of the heating means is restricted when the opening detection failure is determined, It is also possible to prevent problems caused by poor door open detection.

FIG. 1 is a schematic configuration diagram of a cooking cooker according to an embodiment of the present invention. FIG. 2 is a flowchart showing a control operation when determining an open detection failure of an open / close switch of a cooking cooker according to an embodiment of the present invention. FIG. 3 is a graph showing a temperature change in the electrical chamber when the front door is opened in 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, the heating cooker 1 according to the embodiment of the present invention includes a heating oven 10 capable of accommodating a plurality of trays 2 on which a plurality of trays 2 to be placed such as foodstuffs and cooking containers are placed side by side. It is provided with a burner 14 as a heating means for heating the object F to be heated in the heating chamber 10, and the combustion exhaust gas (hot air) discharged from the burning chamber 14 is circulated and supplied into the heating chamber 10 by a circulation fan 15 for heating. This is a gas oven that heats the object F to be heated in the refrigerator 10. In the present specification, the front surface of the main body case 11 (hereinafter referred to as “the front surface of the main body”) 111 is the front surface of the heating cooker 1, and the depth direction of the main body case 11 when the heating 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 inlet / outlet 100 for the object to be heated for taking in / out the object F to be taken in and out of the heating chamber 10 in a state of being rotatable back and forth around the lower side portion of the main body case 11, and is heated. A front door 12 that closes the entrance / exit 100 from the front and an operation panel 13 as an operation means for operating the heating cooker 1 are provided.

Although not shown, the operation panel 13 has 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 heating such as heating temperature and heating time. A setting operation switch for arbitrarily setting the operating conditions of the cooker 1, a display unit for displaying the operating state of the cooker 1 and the set operating conditions, and the like are provided.

A combustion chamber 20 in which the burner 14 is arranged is provided in the lower part of the heating chamber 10 inside the main body case 11. 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, hot air introduced into the heating chamber 10 by the circulation fan 15 and the like are opened in the upper part of the main body case 11. An exhaust passage 30 leading to the exhaust port 101 and an external air passage 40 for allowing air outside the main body case 11 to flow along the exhaust passage 30 are provided.

The exhaust passage 30 extends from the upper part of the heating chamber 10 toward the rear, and further extends upward to the opening position of the exhaust port 101. The external air passage 40 extends rearward from the front surface 111 of the main body, and extends along the upper surface of the exhaust passage 30 to the opening position of the exhaust port 101. The upper ends of the exhaust passage 30 and the external air passage 40 each face the exhaust port 101 from below. A predetermined gap 102 is defined between the upper ends of the exhaust passage 30 and the external air passage 40 and the inner peripheral edge of the exhaust port 101.

At the rear of the heating chamber 10 in the main body case 11, a hot air passage 31 for guiding the hot air in the heating chamber 10 and the combustion chamber 20 to the fan case 34 of the circulation fan 15 is provided. The fan case 34 is provided at the rear of the hot air passage 31.

Although not shown, a flame detection sensor for detecting the presence or absence of a gas combustion flame and an ignition plug for spark discharge near the flame hole forming portion in the combustion chamber 20 are located near the flame hole forming portion. 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 14 is provided, and the amount of gas supplied to the burner 14 by the valve unit. That is, the thermal power is adjusted.

An air intake port 21 for introducing the external air of the main body case 11 into the combustion chamber 20 is provided at a position below the heated object inlet / outlet 100 on the front surface 111 of the main body. The combustion chamber 20 is connected to the hot air passage 31 through a hot air outlet 22 provided at the rear of the upper wall of the combustion chamber 20. The hot air passage 31 is connected to the internal space of the fan case 34 through a suction port 23 provided in the rear wall of the hot air passage 31.

The internal space of the fan case 34 is connected to the internal space of the heating chamber 10 through a hot air outlet 24 provided on the rear wall of the heating chamber 10. The internal space of the heating chamber 10 is connected to the hot air passage 31 through the hot air suction port 25 provided on the rear wall of the heating chamber 10, and is connected to the exhaust passage 30 through the exhaust outlet 26 provided on the upper wall of the heating chamber 10. There is.

Therefore, if the fan motor 150 of the circulation fan 15 is operated to rotate the circulation fan 15, the external air of the main body case 11 is taken into the combustion chamber 20 from the air intake port 21 as the combustion air of the burner 14. After the hot air generated by the burner 14 is guided from the combustion chamber 20 to the hot air passage 31 through the hot air outlet 22, it is further taken into the fan case 34 through the suction port 23, and is taken into the fan case 34 from the hot air outlet 24. It is derived into 10.

Further, a part of the hot air led out from the hot air outlet 24 into the heating chamber 10 is taken out from the hot air suction port 25 to the hot air passage 31, and then taken into the fan case 34 through the suction port 23, and the hot air is taken in again. It is led out from the air outlet 24 into the heating chamber 10. Further, a part of the hot air in the heating chamber 10 is led out from the exhaust outlet 26 to the exhaust passage 30, and is discharged to the outside of the main body case 11 through the exhaust port 101. In this way, the hot air generated by the burner 14 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 above the entrance / exit 100 of the object to be heated on the front surface 111 of the main body, when the front door 12 is closed, the external air passage 40 is passed through the heat shield gaps 50A and 50B provided inside the front door 12. An air intake port 41 for introduction to the door has been established.

The front door 12 is a door in which the front plate 121, the middle plate 122, and the rear plate 123 are arranged side by side with predetermined intervals in the front and rear, and the front and rear double heat shield gaps 50A are provided inside. 50B is defined. At the lower edge of the front door 12, a first ventilation hole 51 for introducing external air into the gap (hereinafter, referred to as “outer gap”) 50A between the front plate 121 and the middle plate 122, and the middle plate 122 A second vent 52 for introducing external air into the gap (hereinafter referred to as "inner gap") 50B between the rear plate 123 and the rear plate 123 is provided.

The outer gap 50A and the inner gap 50B communicate with each other through a communication hole 53 provided at a position near the upper end of the middle plate 122. At the upper part of the middle plate 122, a connecting port 54 is opened which is connected to the air intake port 41 of the front surface 111 of the main body in a state where the front door 12 is closed and communicates the outer gap 50A and the external air passage 40. ..

As described above, during operation, a part of the hot air in the heating chamber 10 is discharged from the exhaust port 101 to the outside of the main body case 11 through the exhaust passage 30, but due to the draft effect at that time, the external air passage An air flow toward the exhaust port 101 is also generated in the 40. Further, attracted by the air flow in the external air passage 40, an air flow toward the air intake port 41 is also generated in the gaps 50A and 50B of the front door 12 (the air in the inner gap 50B communicates with each other). It is attracted from the hole 53 through the outer void 50A to the external air passage 40). As a result, the outside air is drawn into the outer gap 50A from the first ventilation hole 51 and into the inner gap 50B from the second ventilation hole 52. That is, after the external air is drawn into the gaps 50A and 50B of the front door 12 by the draft effect, it is discharged from the exhaust port 101 to the outside of the main body case 11 through the external air passage 40.

In the upper part of the external air passage 40 in the main body case 11, the electrical equipment chamber accommodating the control board (hereinafter referred to as “operation board”) 130 of the operation panel 13 and the main control board 6 for controlling the operation of the entire cooking cooker 1. 60 is provided. The electrical chamber 60 includes a cooling fan 16 as an air supply means for supplying external air into the electrical chamber 60 and cooling the main control board 6 and the operation board 130.

An air intake port 61 for introducing external air into the electrical equipment chamber 60 is provided at a position above the heated object inlet / outlet 100 on the front surface 111 of the main body. The electrical chamber 60 is connected to a space (hereinafter, referred to as “upper space inside the case”) 110 inside the main body case 11 through an air outlet 62 provided on the rear wall of the electrical chamber 60.

Therefore, when a fan motor (not shown) of the cooling fan 16 is operated to rotate the cooling fan 16, external air is introduced from the air intake port 61 into the arrangement portion of the main control board 6 or the operation board 130 in the electrical equipment chamber 60. After that, the air is led out from the air outlet 62 to the upper space 110 inside the case, and is discharged from the exhaust port 101 to the external space of the main body case 11 through the gap 102 on the outer periphery of the upper end of the exhaust passage 30 and the external air passage 40.

An open / close switch 71 as an open / close detecting means for detecting an open / closed state of the front door 12 is arranged at a position facing the front door 12 on the front surface 111 of the main body. At a position near the exhaust outlet 26 in the exhaust passage 30, the internal temperature as an internal temperature detecting means for detecting the temperature of the air discharged from the heating chamber 10 into the exhaust passage 30 as the temperature inside the heating chamber 10. A sensor 72 is arranged. At a position near the air outlet 62 in the electrical equipment chamber 60, the temperature in the electrical equipment chamber 60, that is, the temperature around the main control board 6, the operation board 130, and the cooling fan 16 in the electrical equipment chamber 60 is detected. An electrical component temperature sensor 73 is provided as a supply air temperature detecting means.

An igniter that applies a high voltage to an operation board 130, a fan motor 150, a fan motor of a cooling fan 16, an open / close switch 71, an internal temperature sensor 72, an electrical component temperature sensor 73, a flame detection sensor (not shown), and a spark plug to discharge sparks. , The valve drive unit of the valve unit, etc. are all connected to the main control board 6 through electrical wiring.

The main control board 6 is a burner control unit that ignites, extinguishes, and adjusts the thermal power of the burner 14, a fan control unit that operates or stops the fan motor 150, adjusts the rotation speed, and the burner 14 based on the output value of the flame detection sensor. Based on the detection temperature of the fire extinguishing determination unit, the internal temperature determination unit that determines the temperature state inside the heating chamber 10 based on the detection temperature of the internal temperature sensor 72, and the electrical component temperature sensor 73. The temperature determination unit for determining the temperature inside the electrical chamber 60, the opening / closing determination unit for determining whether or not the front door 12 has been opened based on the on / off state of the open / close switch 71, the thermal power of the burner 14, and the circulation fan 15. A heating control unit that controls the circulation amount of air in the heating chamber 10 to adjust the temperature in the heating chamber 10, and controls the amount of air supplied into the electrical equipment chamber 60 by the cooling fan 16 to control the temperature in the electrical equipment chamber 60. It has a control circuit such as a cooling control unit that adjusts the temperature.

Further, the main control board 6 detects the electrical component temperature sensor 73 when the front door 12 is detected to be closed by the open / close switch 71 (here, the open / close switch 71 is on). The open detection failure determination unit that determines the open detection failure of the front door 12 by the open / close switch 71 based on whether or not the temperature shows an increase change of a predetermined value or more in a predetermined time, and the open / close switch 71 causes the front door 12 to be operated by the open / close switch 71 during the heating operation. It has a control circuit such as a heating limiting unit that limits the heating operation of the burner 14 when it is detected that it is in the open state or when the open / close switch 71 is determined to have an open detection failure by the open detection failure determining unit. doing.

The control operation when determining the open detection failure of the open / close switch 71 by the main control board 6 will be described with reference to the flowchart of FIG. First, when the power is turned on by a power switch (not shown) on the operation panel 13 and the power of the cooking cooker 1 is turned on, the main control program of the cooking cooker 1 incorporated in the control circuit of the main control board 6 Is activated, and the heating operation becomes feasible (ST1). Then, in this state, if the heating temperature and the heating time are set by the setting operation switch (not shown) on the operation panel 13, the set temperature Ts and the set time Cs at the time of the heating operation are set.

Further, although not shown, when the power of the heating cooker 1 is turned on, the detection temperature of the electrical component temperature sensor 73 (hereinafter referred to as “electrical section temperature”) T3 is set to a preset fan operating temperature (for example, 60). ℃) Start monitoring whether or not it is Tf or higher. Then, if the electrical component temperature T3 is equal to or higher than the fan operating temperature Tf, the cooling fan 16 is operated to introduce external air into the electrical component chamber 60. As a result, overheating of the main control board 6 and the operation board 130 is suppressed. On the other hand, when the electrical component temperature T3 becomes lower than the fan operating temperature Tf, the cooling fan 16 is stopped and the introduction of external air into the electrical component chamber 60 is stopped. In the present embodiment, the cooling fan 16 is switched on and off according to the electrical component temperature T3 as described above, but the cooling fan 16 is turned on when the power of the heating cooker 1 is turned on. When the temperature of the electrical component unit T3 becomes equal to or higher than the fan operating temperature Tf, the cooling fan 16 is switched to the high rpm and the amount of external air introduced into the electrical chamber 60 is increased. May be increased.

When the operation switch on the operation panel 13 is used to instruct the start of the heating operation after the power of the cooking cooker 1 is turned on, it is determined whether or not the open / close switch 71 is turned on. (ST2 to ST3). Here, if the open / close switch 71 is in the off state (No in the step of ST3), the process returns to the step of ST1 without performing the heating operation (ST9).

On the other hand, if the open / close switch 71 is on (Yes in the step of ST3) when the instruction to start the heating operation is given, the electrical component temperature T3 is the upper limit temperature within a predetermined time (for example, within 10 seconds). It is determined whether or not the temperature is (for example, 110 ° C.) Th or higher, and whether or not the rising gradient ΔT per unit time of the electrical component temperature T3 is equal to or higher than the reference gradient (for example, 5 deg) H within the predetermined time. (ST4 to ST5).

Immediately after the instruction to start the heating operation is given, the electrical component temperature T3 is usually less than the upper limit temperature Th, and the ascending gradient ΔT is also less than the reference gradient H (No in the steps of ST4 and ST5). Therefore, in this case, assuming that the open state of the front door 12 is normally detected by the open / close switch 71, the detection temperature (hereinafter referred to as “internal temperature”) T2 of the internal temperature sensor 72 becomes the set temperature Ts. The combustion of the burner 14 and the rotation speed of the circulation fan 15 are controlled so that the heating operation for circulating and supplying hot air into the heating chamber 10 is started (ST6).

Specifically, first, the fan motor 150 of the circulation fan 15 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 the burner 14 is supplied with an amount of fuel gas suitable for ignition. As a result, the burner 14 is ignited.

When the flame detection sensor detects the ignition of the burner 14, that is, the combustion flame, the fan motor 150 of the circulation fan 15 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 during the heating operation, and the burner 14 is burned at the set thermal power (here, high thermal power). As a result, the hot air generated by the burner 14 is circulated and supplied into the heating chamber 10 to heat the object F to be heated.

From the time when the heating operation is started, it is monitored whether or not the heating operation time (heating time) C1 reaches the set time Cs (ST7). After that, when the heating time C1 reaches the set time Cs (Yes in the step of ST7), the fan motor 150 is stopped, and the electromagnetic on-off valve of the valve unit is closed to extinguish the burner 14. 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 (ST8).

When the open / close switch is turned off during the heating operation (No in the step of ST3), the temperature inside the heating chamber 10 is high from the object to be heated inlet / outlet 100 to the outside of the main body case 11 due to the opening of the front door 12. There is a risk that the hot air will continue to flow out. Therefore, in this case, the fan motor 150 is stopped and the burner 14 is extinguished as in the step of ST8. As a result, the circulation supply of hot air into the heating chamber 10 is forcibly stopped (ST9).

On the other hand, during the heating operation, even though the open / close switch 71 is on (Yes in the step of ST3), did the electrical component temperature T3 reach the upper limit temperature Th or more within the predetermined time (Yes in the step of ST4)? Alternatively, when the rising gradient ΔT per unit time of the electrical component temperature T3 becomes equal to or higher than the reference gradient H (Yes in the step of ST5), the front door 12 is open and the open / close switch 71 is turned on. The fan motor 150 is stopped and the burner 14 is extinguished on the assumption that the front door 12 is not open and detected by the open / close switch 71. As a result, the circulation supply of hot air into the heating chamber 10 is forcibly stopped (ST9).

As described above, when the electrical component temperature T3 is equal to or higher than the fan operating temperature Tf during the heating operation, the cooling fan 16 is operated to introduce external air into the electrical component chamber 60 from the air intake port 61. .. Therefore, when the front door 12 is opened during the heating operation and the high-temperature hot air in the heating chamber 10 flows out from the heated object inlet / outlet 100 to the front outside of the main body case 11, the hot air is taken into the air intake port 61 together with the outside air. It is taken into the electrical equipment chamber 60 and raises the electrical component temperature T3.

However, if the open / close switch 71 is normally turned off as a result of opening the front door 12, the circulation supply of hot air into the heating chamber 10 is promptly stopped. Therefore, as shown in the graph L1 of FIG. 3, the electrical component temperature T3 temporarily shows a gentle upward gradient, but does not reach the upper limit temperature Th. On the other hand, if the open / close switch 71 is not turned off even though the front door 12 is opened, hot air continues to be circulated and supplied into the heating chamber 10. Therefore, as shown in the graph L2 of FIG. 3, the electrical component temperature T3 shows a steeper rising gradient than in the normal state, and continues to rise sharply in a short time to reach the upper limit temperature Th.

As described above, in the heating cooker 1 according to the present embodiment, the degree of increase in the detection temperature (electrical unit temperature) T3 of the electrical room temperature sensor 73 when the open / close switch 71 is on during cooking is different. The open / close switch 71 determines the opening detection failure of the front door 12. As a result, it is not necessary to provide a plurality of open / close switches 71, and it is possible to detect an opening detection failure of the front door 12 by using the existing monitoring means, so that the configuration of the entire cooking cooker 1 can be simplified. Further, since the circulation supply of hot air into the heating chamber 10 is immediately stopped when it is determined that the opening detection is defective, the electrical components of the operation panel 13, the operation board 130, the main control board 6 and the like are deformed or malfunction. It is also possible to appropriately prevent problems caused by the outflow of hot air from the entrance / exit 100 of the object to be heated, such as discomfort to the user.

In the above embodiment, the electrical component temperature sensor 73 is used as a monitoring means for detecting the state change of the heating cooker 1, and is based on the degree of increase in the detection temperature (electrical component temperature) T3 of the electrical component temperature sensor 73. Although the method of determining the opening detection failure of the front door 12 by the open / close switch 71 has been described, the internal temperature sensor 72 is used as a monitoring means for detecting the state change of the heating cooker 1, and the detection temperature of the internal temperature sensor 72 is used. (Inside temperature) The opening / closing failure of the front door 12 by the open / close switch 71 may be determined based on the degree of drop of T2.

When the front door 12 is opened during the heating operation, the hot air in the heating chamber 10 flows out from the heating object inlet / outlet 100 to the outside of the main body, and the outside air flows into the heating chamber 10 to lower the temperature T2 in the chamber. .. Therefore, even though the open / close switch 71 is in the ON state, when the internal temperature T2 shows a drop change of a predetermined value or more (specifically, the internal temperature T2 becomes a predetermined temperature or less within a predetermined time). In this case, or when the descent gradient per unit time of the internal temperature T2 becomes equal to or higher than the reference gradient), the open / close switch 71 does not normally detect that the front door 12 has been opened, that is, Judged as open detection failure. As described above, by determining the opening detection failure of the front door 12 based on the degree of decrease of the internal temperature T2 when the open / close switch 71 is in the ON state, the same operation and effect as those of the above-described embodiment can be obtained.

Further, a weight sensor (weight detecting means) for detecting the weight of the object to be heated F is provided inside the heating chamber 10, and the weight sensor is used as a monitoring means for detecting a state change of the heating cooker 1. If the detection value of the weight sensor shows an increase or decrease change of a predetermined value or more within a predetermined time even though the open / close switch 71 is on during the heating operation, the front door 12 is opened and the front door 12 is opened. Assuming that the object F to be heated is taken out from the inside of the heating chamber 10 or the object F to be heated is housed in the heating chamber 10, it is determined that the opening / closing switch 71 fails to detect the opening of the front door 12. It may be configured. In this case, since the response is higher than determining the open / closed state of the front door 12 based on the temperature change, it is possible to detect the opening detection failure more quickly and reliably.

Further, a humidity sensor (humidity detecting means) for detecting the humidity in the heating chamber 10 is provided in the heating chamber 10 or the exhaust passage 30, and the above-mentioned humidity is used as a monitoring means for detecting the state change of the heating cooker 1. When the sensor is used and the open / close switch 71 is on during the heating operation, but the humidity detected by the humidity sensor shows a drop change of a predetermined value or more within a predetermined time, the front door 12 is opened. Therefore, assuming that the air in the heating chamber 10 containing a large amount of water vapor has flowed out from the heating chamber 10 to the outside of the main body from the object to be heated inlet / outlet 100, it is determined that the opening / closing switch 71 has failed to detect the opening of the front door 12. It may be configured in. In this way, by determining the open detection failure from the difference in the degree of decrease in the detected humidity, the same effect as that of the above-described embodiment can be obtained.

Further, an outside air temperature sensor for detecting the temperature inside the external air passage 40 is provided near the air intake port 41 in the external air passage 40, and as a monitoring means for detecting the state change of the heating cooker 1. When the above-mentioned outside air temperature sensor is used and the detection temperature of the outside air temperature sensor shows an increase change of a predetermined value or more within a predetermined time even though the open / close switch 71 is on during the heating operation, the front door 12 is opened, and it is determined that the open / close switch 71 has failed to detect the opening of the front door 12 on the assumption that the hot air in the heating chamber 10 has flowed into the external air passage 40 from the heated object inlet / outlet 100 through the air intake port 41. It may be configured to do so. With such a configuration, the same function and effect as those of the above-described embodiment can be obtained.

The present invention is not limited to the gas oven in which the heated object F housed in the heating chamber 10 is cooked by circulating the hot air generated by the burner 14 in the heating chamber 10 by the circulation fan 15, and the upper surface of the main body is not limited to the gas oven. 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. It can also be applied to an oven function in which the hot air discharged from the oven burner is circulated in the heating chamber by a circulation fan to cook the object F to be heated.

1 Heat cooker 10 Heater 100 Heated object inlet / outlet 12 Front door 14 Burner (heating means)
71 Open / close switch (open / close detection means)
73 Electrical component temperature sensor (monitoring means)
6 Main control board F Heated object

Claims (5)

A heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means that heats the inside of the heating chamber, an opening / closing detecting means that detects the open / closed state of the door, and an open / closed detecting means that keeps the door open. A heating cooker provided with a heating control means that limits the heating operation of the heating means when it is detected to be present.
Monitoring means to detect specific state changes of the cooker,
When the monitoring means detects a change in the state of the cooking cooker more than a predetermined value while the door is detected to be closed by the open / close detecting means, it is determined that the door is not opened by the open / closed detecting means. and means,
Equipped with an air supply means to introduce air outside the main body,
The monitoring means is a supply air temperature detecting means for detecting the temperature of the air introduced by the air supply means.
The air supply means and the air supply temperature detecting means are housed in a space provided above the heating chamber, and an air intake port for introducing external air into the space is an entrance / exit of a heated object in the heating chamber. It is located above the
The detection failure determining means opens the door when the opening / closing detecting means detects that the door is closed and the detection temperature of the supply air temperature detecting means shows an increase change of a predetermined time or more in a predetermined time. A heating cooker that determines that the door opening is not detected properly by the open / close detection means that does not detect the open state. A heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means that heats the inside of the heating chamber, an opening / closing detecting means that detects the open / closed state of the door, and an open / closed detecting means that keeps the door open. A heating cooker provided with a heating control means that limits the heating operation of the heating means when it is detected to be present.
Monitoring means to detect specific state changes of the cooker,
When the monitoring means detects a change in the state of the cooking cooker more than a predetermined value while the door is detected to be closed by the open / close detecting means, it is determined that the door is not opened by the open / closed detecting means. With means,
The monitoring means is an internal temperature detecting means for detecting the temperature inside the heating chamber.
The detection failure determining means opens the door by the opening / closing detecting means when the opening / closing detecting means detects that the door is closed and the detection temperature of the internal temperature detecting means shows a drop change of a predetermined value or more. A cooking device that is judged to be defective in detection. A heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means that heats the inside of the heating chamber, an opening / closing detecting means that detects the open / closed state of the door, and an open / closed detecting means that keeps the door open. A heating cooker provided with a heating control means that limits the heating operation of the heating means when it is detected to be present.
Monitoring means to detect specific state changes of the cooker,
When the monitoring means detects a change in the state of the cooking cooker more than a predetermined value while the door is detected to be closed by the open / close detecting means, it is determined that the door is not opened by the open / closed detecting means. With means,
The monitoring means is a weight detecting means for detecting the weight of the object to be heated contained in the heating chamber.
The detection failure determining means opens the door by the opening / closing detecting means when the opening / closing detecting means detects that the door is closed and the detection value of the weight detecting means changes by a predetermined time or more in a predetermined time. A cooking device that is judged to be defective in detection. A heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating means that heats the inside of the heating chamber, an opening / closing detecting means that detects the open / closed state of the door, and an open / closed detecting means that keeps the door open. A heating cooker provided with a heating control means that limits the heating operation of the heating means when it is detected to be present.
Monitoring means to detect specific state changes of the cooker,
When the monitoring means detects a change in the state of the cooking cooker more than a predetermined value while the door is detected to be closed by the open / close detecting means, it is determined that the door is not opened by the open / closed detecting means. With means,
The monitoring means is a humidity detecting means for detecting the humidity in the heating chamber.
The detection failure determining means is a state in which the door is detected to be closed by the opening / closing detecting means, and when the detected humidity of the humidity detecting means shows a descent change of a predetermined time or more in a predetermined time, the opening / closing detecting means of the door. A cooking device that determines that the door is not detected properly. In the cooking apparatus according to any one of claims 1 to 4,
The heating control means is a heating cooker that prohibits the heating operation of the heating means when the detection failure determining means determines the open detection failure.

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