JP2019020014A - Heating cooker - Google Patents

Abstract

To achieve prevention of failure caused by opening detection failure of a door with a relatively simple structure, in a heating cooker including opening/closing detection means for detecting an opening/closing state of a door of a heating chamber.SOLUTION: A heating cooker includes: a heating chamber 10 having an inlet/outlet 100 of an object F to be heated; a door 12 for closing the inlet/outlet 100; heating means 14 for heating the inside of the heating chamber 10; opening/closing detection means 71 for detecting an opening/closing state of the door 12; and heating control means for controlling the heating operation of the heating means 14 when the door 12 is detected to be in an open state by the opening/closing detection means 71. It also includes: monitoring means 73 for detecting a specific state change of the heating cooker 1; and detection failure determination means for, in the case where the monitoring means 73 has detected a state change of equal to or greater than a predetermined change of the heating cooker 1, in a state where the door 12 is detected to be in a closed state by the opening/closing detection means 71, determining that it is opening detection failure of the door 12 by the opening/closing detection means 71.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooking device, and more particularly to a cooking device having a function of restricting the operation of a heating means when a door of a heating cabinet 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 food items in the heating chamber or an object to be heated such as a cooking container, it interlocks with the opening and closing of the heating chamber door And an opening / closing switch that is turned on / off, and having a function of limiting the operation of the heating means when the door is opened during heating operation and the opening / closing switch is turned off (for example, patents) Reference 1 and 2).

JP 2013-64589 A JP, 2006-52390, A

  However, in the above-described conventional cooking device, when the open / close switch is not turned off due to failure or sticking, that is, when the door cannot be properly detected, the door is opened during the heating operation. Even if this is done, the operation limiting function of the heating means does not work, and high-temperature hot air in the heating chamber continues to flow out of the body from the heated object entrance. Thereby, there was a possibility of giving a user a remarkable discomfort. In addition, in the case where electrical components such as operation switches and display panels are provided at the peripheral edge of the heated object entrance / exit, the electrical components and the control board may be exposed to hot air for a long time, leading to deformation and failure.

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

  The present invention has been made in view of the above problems, and its purpose 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 cabinet is opened. Therefore, it is intended to prevent problems caused by poor detection of door opening.

  The present invention relates to a heating chamber having an entrance / exit for an object to be heated, a door that closes the entrance / exit, a heating unit that heats the inside of the heating chamber, an open / close detection unit that detects an open / close state of the door, and an open / close detection unit. A heating cooker provided with a heating control means for restricting the heating operation of the heating means when it is detected that the heating means is in an open state, and a monitoring means for detecting a specific state change of the heating cooker; Detection failure determination means for determining that the opening / closing detection means is a door opening detection failure when the detection means detects a change in state of the heating cooker above a predetermined level when the detection means detects that the door is closed. It is equipped with.

  In this case, the door is opened when a change in state of the heating cooker over a predetermined level is detected by the monitoring means even though the door is detected by the open / close detection means. Since it is determined that the open / close detection means does not accurately detect that the door is open, that is, it is determined that the door open / close detection failure is detected by the open / close detection means, it is not necessary to provide a plurality of open / close detection means. It can also be detected.

  Preferably, in the heating cooker, the heating cooker further includes an air supply means for supplying air outside the main body to the periphery of the operation means arrangement portion for operating the heating cooker, and the monitoring means is the operation means or the arrangement portion of the air supply means The supply air temperature detection means for detecting the ambient temperature, and the detection failure determination means is a state in which the detection temperature of the supply air temperature detection means is predetermined at a predetermined time when the door detection state is detected by the opening / closing detection means. When the above change is shown, it is determined that the door opening / closing detection means has failed to detect the opening of the door.

  In this case, when the door is opened during the heating operation, and the hot air in the heating chamber flows out of the main body from the entrance / exit of the object to be heated, the hot air is supplied by the air supply means by the arrangement portion of the air supply means and the operation means. Guided around. Therefore, when the detected temperature of the supply air temperature detecting means shows a change higher than a predetermined value for a predetermined time even though it is detected that the door is closed by the open / close detecting means, the open / close detecting means It is determined that the door open detection is poor. Thereby, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection failure using existing monitoring means.

  Preferably, in the heating cooker, the monitoring means is an internal temperature detection means for detecting the temperature in the heating compartment, and the detection failure determination means is a state where the open / close detection means detects that the door is closed. Thus, when the temperature detected by the internal temperature detecting means shows a change in drop that exceeds a predetermined value, it is determined that the door opening / closing detecting means has failed to detect the opening of the door.

  When the door is opened during the heating operation, hot air in the heating chamber flows out of the body from the entrance and exit of the object to be heated, and air outside the body flows into the heating chamber and lowers the temperature in the heating chamber. Therefore, when the detected temperature of the internal temperature detecting means shows a change of a predetermined level or more even though it is detected by the open / close detecting means that the door is closed, It is determined that the open detection is defective. Thereby, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection failure using existing monitoring means.

  Preferably, in the heating cooker, the monitoring means is a weight detection means for detecting the weight of an object to be heated accommodated in the heating chamber, and the detection failure determination means is a door closed by the open / close detection means. When the detected value of the weight detection means shows a change greater than or equal to a predetermined value for a predetermined time, it is determined that the door open / close detection failure by the open / close detection means is detected.

  In this case, the door is opened when the detection value of the weight detection means shows a change of a predetermined value or more in a predetermined time even though the opening / closing detection means detects that the door is closed. Then, it is determined that the object to be heated has been taken out from the heating chamber, or that the object to be heated has been stored in the heating chamber, and that the door opening / closing detection means by the open / close detection means is defective. Thereby, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection failure using existing monitoring means.

  Preferably, in the heating cooker, the monitoring means is a humidity detecting means for detecting the humidity in the heating chamber, and the detection failure determining means is in a state where the door is detected to be closed by the open / close detecting means, When the detected humidity of the humidity detecting means shows a change in a drop of a predetermined value or more in a predetermined time, it is determined that the door open / closed detection failure by the open / close detecting means is poor.

  When the door is opened during the heating operation, air in the heating chamber containing a large amount of water vapor flows out of the body from the entrance and exit of the article to be heated, and the humidity in the heating chamber is lowered. Accordingly, when the detected humidity of the humidity detecting means shows a decrease in a predetermined level or more in a predetermined time even though the door is detected to be closed by the open / close detecting means, the door by the open / close detecting means It is determined that the open detection failure is detected. Thereby, it is not necessary to provide a plurality of open / close detection means, and it is possible to detect an open detection failure using existing monitoring means.

  Preferably, in the cooking device, the heating control unit prohibits the heating operation of the heating unit when the detection failure determination unit determines that the open detection is defective.

  In this case, when it is determined that the open detection is defective during the heating operation of the heating means, the heating operation can be prohibited, so that the hot air can be prevented from continuing to flow out of the body from the entrance / exit of the object to be heated. I can stop.

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

FIG. 1 is a schematic configuration diagram of a cooking device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a control operation when determining an open detection failure of the open / close switch of the cooking device according to the embodiment of the present invention. FIG. 3 is a graph showing a temperature change in the electrical equipment chamber when the front door is opened in 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 includes a heating chamber 10 that can accommodate a plurality of trays 2 on which a heated object F such as a food or a cooking container is placed, And a burner 14 as a heating means for heating the article F to be heated in the heating chamber 10, and the combustion exhaust gas (hot air) discharged from the burner 14 is circulated and supplied into the heating chamber 10 by the circulation fan 15. It is a gas oven that heats an object to be heated F in the cabinet 10. 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, and an operation panel 13 as operation means for operating the heating cooker 1 are provided.

  Although not shown in the figure, the operation panel 13 has 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, heating temperature, heating time, and the like. A setting operation switch for arbitrarily setting the operation condition of the cooking device 1, a display unit for displaying the operation state of the heating cooker 1 and the set operation condition, and the like are provided.

  A combustion chamber 20 in which a 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 case 10 in the main body case 11, oil smoke and odor components released from the object to be heated F, hot air introduced into the heating case 10 by the circulation fan 15, etc. are opened in the upper part of the main case 11. An exhaust passage 30 that leads to the exhaust port 101 and an external air passage 40 that allows air outside the main body case 11 to flow along the exhaust passage 30 are provided.

  The exhaust passage 30 extends rearward from the upper part of the heating chamber 10, 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 to the opening position of the exhaust port 101 along the upper surface portion of the exhaust passage 30. The upper ends of the exhaust passage 30 and the external air passage 40 respectively 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.

  A hot air passage 31 that guides hot air in the heating chamber 10 and the combustion chamber 20 to the fan case 34 of the circulation fan 15 is provided at the rear 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 14 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 comprising an electromagnetic on-off valve and a heat control valve for adjusting the amount of gas supplied to the burner 14, and the amount of gas supplied to the burner 14 by the valve unit, That is, the heating power is adjusted.

  An air intake 21 for introducing the external air of the main body case 11 into the combustion chamber 20 is opened at a position below the heated object inlet / outlet port 100 in the main body front surface 111. The combustion chamber 20 is connected to a hot air passage 31 through a hot air outlet 22 provided in the rear portion 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 established in the rear wall of the heating chamber 10, and is connected to the exhaust passage 30 through the exhaust outlet 26 established in the upper wall of the heating chamber 10. Yes.

  Therefore, when 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 combustion air for the burner 14. After the hot air generated in 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 heated from the hot air outlet 24 to the heating chamber. 10 is derived.

  Further, part of the hot air led out from the hot air outlet 24 into the heating chamber 10 is led 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, so that the hot air again It leads out into the heating chamber 10 from the blower outlet 24. 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 outlet 101. As described above, 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 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.

  In the state where the front door 12 is closed, the external air passage 40 passes through the heat shielding gaps 50 </ b> A and 50 </ b> B provided inside the front door 12 in the state where the front door 12 is closed. An air intake port 41 is introduced for introduction into the system.

  The front door 12 is a door in which a front plate 121, an intermediate plate 122, and a rear plate 123 are arranged side by side with a predetermined interval in the front and rear, and a front and rear double heat shielding gap 50A, 50B is defined. At the lower edge portion of the front door 12, a first vent hole 51 for introducing external air into a gap (hereinafter referred to as “outside gap”) 50 </ b> A between the front plate 121 and the middle plate 122, and the middle plate 122. A second ventilation hole 52 for introducing external air into a gap (hereinafter referred to as “inner gap”) 50 </ b> B between the rear plate 123 and the rear plate 123 is opened.

  The outer gap 50 </ b> A and the inner gap 50 </ b> B communicate with each other via a communication hole 53 that is opened at a position near the upper end of the intermediate plate 122. In the upper part of the middle plate 122, a connection port 54 that is connected to the air intake port 41 of the front surface 111 of the main body 111 in a state where the front door 12 is closed and that connects the outer gap 50 </ b> A and the external air passage 40 is opened. .

  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 the external air passage is caused by the draft effect at that time. An air flow toward the exhaust port 101 is also generated in the air 40. In addition, the air flow toward the air intake 41 is also generated in each of the air gaps 50A and 50B of the front door 12 by being attracted by the air flow in the external air passage 40 (the air in the inner air gap 50B is in communication). From the hole 53 through the outer gap 50A to the external air passage 40). As a result, external air is drawn into the outer gap 50A from the first vent hole 51 and drawn into the inner gap 50B from the second vent hole 52. That is, external air is drawn into the gaps 50 </ b> A and 50 </ b> B of the front door 12 by the draft effect, and then 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, an electrical component room that houses a control board (hereinafter referred to as “operation board”) 130 of the operation panel 13 and a main control board 6 that controls the operation of the heating cooker 1 as a whole. 60 is provided. A cooling fan 16 is housed in the electrical compartment 60 as an air supply means for supplying external air into the electrical compartment 60 and cooling the main control board 6 and the operation board 130.

  An air intake 61 for introducing external air into the electrical equipment chamber 60 is provided at a position above the heated object entrance / exit 100 on the front surface 111 of the main body. The electrical compartment 60 is connected to a space 110 in the upper area inside the main body case 11 (hereinafter referred to as “upper space in the case”) through an air outlet 62 provided in the rear wall of the electrical compartment 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 to the main control board 6 and 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 in the case, and is discharged from the exhaust port 101 to the outer space of the main body case 11 through the gap 102 at the outer periphery of the exhaust passage 30 and the outer air passage 40.

  An opening / closing switch 71 as an opening / closing detection means for detecting the opening / closing state of the front door 12 is disposed at a position facing the front door 12 on the front surface 111 of the main body. In the vicinity of the exhaust outlet 26 in the exhaust passage 30, the internal temperature as the internal temperature detection means for detecting the temperature of the air discharged from the heating chamber 10 to the exhaust passage 30 as the temperature in the heating chamber 10. A sensor 72 is provided. In the vicinity of the air outlet 62 in the electrical compartment 60, the temperature in the electrical compartment 60, that is, the temperature around the main control board 6, the operation board 130, and the cooling fan 16 in the electrical compartment 60 is detected. An electrical component temperature sensor 73 is disposed as supply air temperature detecting means.

  Operation board 130, fan motor 150, fan motor for cooling fan 16, open / close switch 71, internal temperature sensor 72, electrical component temperature sensor 73, flame detection sensor (not shown), igniter for applying a high voltage to the spark plug and causing spark discharge The valve drive unit of the valve unit is connected to the main control board 6 through electric wiring.

  The main control board 6 is based on an output value of a burner control unit for igniting and extinguishing the burner 14 and adjusting the heating power, a fan control unit for operating and stopping the fan motor 150, and adjusting the rotation speed, and the output value of the flame detection sensor. On the basis of the detected temperature of the point fire extinguishing determination unit for determining ignition and extinguishing of the interior, the internal temperature determining unit for determining the temperature state in the heating chamber 10 based on the detected temperature of the internal temperature sensor 72, and the detected temperature of the electrical component temperature sensor 73 By an electrical component temperature determination unit that determines the temperature state in the electrical component chamber 60, an open / close determination unit that determines 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 air circulation amount in the heating chamber 10 to adjust the temperature in the heating chamber 10, and the temperature in the electrical chamber 60 by controlling the amount of air supplied into the electrical chamber 60 by the cooling fan 16. The And a control circuit such as cooling control unit for integer.

  The main control board 6 detects the electrical component temperature sensor 73 when it is detected that the front door 12 is closed by the open / close switch 71 (here, the open / close switch 71 is on). An open detection failure determination unit that determines open detection failure of the front door 12 by the open / close switch 71 based on whether or not the temperature has increased more than a predetermined amount at a predetermined time, and the front door 12 is opened by the open / close switch 71 during the heating operation. A control circuit such as a heating limiting unit that limits the heating operation of the burner 14 is provided when the open state is detected or when the open / close switch 71 determines that the open / close switch 71 has an open detection failure. 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 according 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 heating cooker 1 is turned on, the main control program for the heating cooker 1 incorporated in the control circuit of the main control board 6. Is activated, and the heating operation can be executed (ST1). In this state, if the setting operation of the heating temperature and the heating time is performed by a setting operation switch (not shown) of the operation panel 13, the setting temperature Ts and the setting time Cs during the heating operation are set.

  Although not shown, when the heating cooker 1 is turned on, a temperature detected by the electrical component temperature sensor 73 (hereinafter referred to as “electrical component temperature”) T3 is set to a preset fan operating temperature (for example, 60). ° C) Start monitoring whether or not it is equal to or higher than Tf. If the electric 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 electric component chamber 60. Thereby, 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 / off according to the electrical component temperature T3 as described above. However, when the heating cooker 1 is turned on, the cooling fan 16 is turned on. When the electrical component temperature T3 is equal to or higher than the fan operating temperature Tf, the cooling fan 16 is switched to a high rotational frequency and the amount of external air introduced into the electrical component chamber 60 is reached. May be increased.

  When the operation of instructing the start of the heating operation is performed by the operation switch of the operation panel 13 after the heating cooker 1 is turned on, it is determined whether the open / close switch 71 is in the on state. (ST2 to ST3). If the open / close switch 71 is off (No in step ST3), the heating operation is not performed (ST9), and the process returns to step ST1.

  On the other hand, if the opening / closing switch 71 is in an ON state when an instruction to start the heating operation is given (Yes in step ST3), 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 (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 a reference gradient (for example, 5 deg) H within the predetermined time. (ST4 to ST5).

  The electrical component temperature T3 immediately after the start of the heating operation is usually less than the upper limit temperature Th, and the rising gradient ΔT is also less than the reference gradient H (both No in steps 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 temperature T2 detected by the internal temperature sensor 72 (hereinafter referred to as “internal temperature”) is set to the set temperature Ts. The combustion operation of the burner 14 and the rotational speed of the circulation fan 15 are controlled so as to start the heating operation for circulating and supplying hot air into the heating chamber 10 (ST6).

  Specifically, first, the fan motor 150 of the circulation fan 15 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 14. Thereby, the burner 14 is ignited.

  When ignition of the burner 14, that is, combustion flame is detected by the flame detection sensor, the fan motor 150 of the circulation fan 15 is set to a predetermined combustion rotational speed (here, the same rotational speed as the ignition rotational speed). Then, the valve unit is adjusted to the opening degree during the heating operation, and the burner 14 is burned with the set heating power (here, strong heating power). Thereby, the hot air produced | generated by the burner 14 is circulated and supplied in the heating chamber 10, and the to-be-heated material F is heated.

  From the time when the heating operation is started, it is monitored whether or not the heating operation time (heating time) C1 has reached the set time Cs (ST7). Thereafter, when the heating time C1 reaches the set time Cs (Yes in step ST7), the fan motor 150 is stopped, and the electromagnetic on-off valve of the valve unit is closed to extinguish the burner 14. Thereby, the circulation supply of the hot air into the heating chamber 10 is stopped, and the heating of the article to be heated F is finished (ST8).

  When the open / close switch is turned off during the heating operation (No in step ST3), the front door 12 is opened, so that the high temperature inside the heating chamber 10 is increased from the heated object entrance 100 to the outside of the main body case 11. The hot air may continue to flow out. Accordingly, in this case, the fan motor 150 is stopped and the burner 14 is extinguished as in the step ST8. Thereby, the circulation supply of the hot air into the heating chamber 10 is forcibly stopped (ST9).

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

  As described above, during the heating operation, when 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 from the air intake 61. . Therefore, when the front door 12 is opened during the heating operation and hot 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 and the external air are taken into the air intake 61. Is taken into the electrical equipment chamber 60 to raise the electrical equipment temperature T3.

  However, if the opening / closing switch 71 is normally turned off as a result of the front door 12 being opened, the circulating supply of hot air into the heating chamber 10 is quickly stopped. Therefore, as shown in the graph L1 of FIG. 3, the electrical component temperature T3 temporarily shows a gentle rising gradient, but does not reach the upper limit temperature Th. On the other hand, if the open / close switch 71 is not turned off despite the front door 12 being 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 steep rising gradient compared with the normal time, and continues to rise rapidly in a short time and reaches the upper limit temperature Th.

  Thus, in the heating cooker 1 according to the present embodiment, the difference in the degree of increase in the detected temperature (electrical component temperature) T3 of the electrical room temperature sensor 73 when the open / close switch 71 is on during cooking. It is determined whether or not the opening / closing switch 71 detects the opening of the front door 12. Thereby, it is not necessary to provide a plurality of opening / closing switches 71, and it is possible to detect an open detection failure of the front door 12 using existing monitoring means. Therefore, it is possible to simplify the configuration of the entire heating cooker 1. Further, since the circulation of hot air into the heating chamber 10 is immediately stopped when it is determined that the open detection is poor, deformation or failure of each electrical component of the operation panel 13, the operation board 130, the main control board 6, etc. Problems caused by the outflow of hot air from the heated object entrance / exit 100, such as discomfort to the user, can also be prevented appropriately.

  In the above embodiment, the electrical component temperature sensor 73 is used as a monitoring means for detecting the state change of the cooking device 1, and based on the degree of increase in the detected temperature (electrical component temperature) T3 of the electrical component temperature sensor 73. In the above description, the open / close switch 71 is used to determine whether the front door 12 is openly detected. However, the internal temperature sensor 72 is used as a monitoring unit for detecting a change in the state of the cooking device 1, and the internal temperature sensor 72 detects the temperature. (Opening temperature) It is good also as what determines the open detection failure of the front door 12 by the opening / closing switch 71 based on the fall degree of T2.

  When the front door 12 is opened during the heating operation, hot air in the heating chamber 10 flows out of the heated object inlet / outlet 100 to the outside of the main body, and external air flows into the heating chamber 10 to lower the internal temperature T2. . Therefore, even when the open / close switch 71 is in the on-state, when the internal temperature T2 shows a change lower than a predetermined value (specifically, the internal temperature T2 falls below the predetermined temperature within a predetermined time). In the case where the opening / closing switch 71 does not normally detect that the front door 12 has been opened, that is, when the descending gradient per unit time of the internal temperature T2 is equal to or higher than the reference gradient), that is, It is determined that the open detection is defective. Thus, by determining the open detection failure of the front door 12 based on the lowering degree of the internal temperature T2 when the open / close switch 71 is in the on state, the same operational effects as in the above embodiment can be obtained.

  Further, a weight sensor (weight detection 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. In the heating operation, when the detection value of the weight sensor shows an increase or decrease more than a predetermined value within a predetermined time even though the open / close switch 71 is on, the front door 12 is opened, Assuming that the object to be heated F has been taken out from the inside of the heating chamber 10 or that the object to be heated F has been accommodated in the heating chamber 10, it is determined that the opening / closing switch 71 has detected that the front door 12 has not been opened. It may be configured. In this case, since the responsiveness is higher than when the open / close state of the front door 12 is determined based on the temperature change, it is possible to detect the open detection failure more quickly and reliably.

  In addition, a humidity sensor (humidity detection means) that detects the humidity in the heating chamber 10 is provided in the heating chamber 10 or the exhaust passage 30, and the humidity is used as a monitoring unit that detects a change in the state of the heating cooker 1. Even if the sensor is used and the open / close switch 71 is in the ON state during the heating operation, the front door 12 is opened when the humidity detected by the humidity sensor shows a drop change of a predetermined value or more within a predetermined time. Assuming that the air in the heating chamber 10 containing a large amount of water vapor from the heating chamber 10 flows out of the body to be heated from the heated object entrance 100, it is determined that the opening detection failure of the front door 12 by the open / close switch 71 is determined. It is good also as what was comprised. As described above, by determining the open detection failure from the difference in the degree of decrease in the detected humidity, the same effects as those of the above-described embodiment can be obtained.

  Further, an outside air temperature sensor that detects the temperature in the external air passage 40 is provided in the vicinity of the air intake port 41 in the external air passage 40, and serves as a monitoring unit that detects a change in the state of the heating cooker 1. When the outside temperature sensor is used and the temperature detected by the outside temperature sensor shows a change higher than a predetermined value within a predetermined time even when the open / close switch 71 is on during the heating operation, the front door 12 is opened, and the hot air in the heating chamber 10 is in a state of flowing into the external air passage 40 from the heated object inlet / outlet 100 through the air intake port 41, and it is determined that the opening / closing switch 71 is not detecting the opening of the front door 12. It may be configured to do so. With such a configuration, the same operational effects as those of the above-described embodiment can be obtained.

  The present invention is not limited to the gas oven that heats and cooks the article to be heated F accommodated in the heating chamber 10 by circulating the hot air generated in the burner 14 into the heating chamber 10 by the circulation fan 15. A gas stove having one or more stove burners, a heating chamber for storing an object to be heated F, 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.

DESCRIPTION OF SYMBOLS 1 Heating cooker 10 Heating chamber 100 Heated object entrance / exit 12 Front door 14 Burner (heating means)
71 Open / close switch (open / close detection means)
73 Electrical temperature sensor (monitoring means)
6 Main control board F Object to be heated

Claims (6)

The door is opened by the heating chamber having the entrance of the object to be heated, the door closing the entrance, the heating means for heating the inside of the heating chamber, the opening / closing detection means for detecting the opening / closing state of the door, and the opening / closing detection means. A heating cooker provided with heating control means for restricting the heating operation of the heating means when it is detected,
Monitoring means for detecting a specific state change of the cooking device;
Detection failure determination that determines that the opening / closing detection means detects a door opening failure when the monitoring means detects a change in state of the heating cooker over a predetermined value when the opening / closing detection means detects that the door is closed. And a cooking device. The heating cooker according to claim 1, wherein
Provided with air supply means for supplying air outside the main body to the periphery of the arrangement portion of the operation means for operating the heating cooker,
The monitoring means is a supply air temperature detection means for detecting the temperature around the operation means or the arrangement portion of the air supply means,
When the detected temperature of the supply air temperature detecting means shows a change higher than a predetermined value in a predetermined time in a state in which the door is detected to be closed by the open / close detecting means, A cooking device that determines that the door is not openly detected. The heating cooker according to claim 1, wherein
The monitoring means is a chamber temperature detection means for detecting the temperature in the heating chamber,
The detection failure determination means is configured to open the door by the open / close detection means when the open / close detection means has detected that the door is closed and the detected temperature of the internal temperature detection means shows a change of a predetermined level or more. A cooking device that determines a detection failure. The heating cooker according to claim 1, wherein
The monitoring means is a weight detection means for detecting the weight of the object to be heated accommodated in the heating chamber,
The detection failure determination means is configured to open the door by the opening / closing detection means when the detection value of the weight detection means shows a change of a predetermined value or more in a predetermined time in a state where the opening / closing detection means detects that the door is closed. A cooking device that determines a detection failure. The heating cooker according to claim 1, wherein
The monitoring means is a humidity detecting means for detecting the humidity in the heating chamber,
The detection failure determination means is a state in which the opening / closing detection means detects that the door has been closed by the opening / closing detection means when the detected humidity of the humidity detection means shows a decrease in a predetermined level or more in a predetermined time. A cooking device that determines that the detection is not open. In the heating cooker according to any one of claims 1 to 5,
The heating controller is configured to prohibit the heating operation of the heating unit when the detection failure determination unit determines that the open detection is defective.

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