Heating cooker

Abstract

To provide a heating cooker capable of improving a convenience of a user while improving a safety property at an over heating generation.SOLUTION: A heating cooker comprises: a non-recover type current block device; a recovery-type thermostat; a heating unit having a heating part electrically connected to a power supply unit via the non-recover type current block device and the recovery-type thermostat; a cocking container that is arranged in a heating unit; and a control part. The recovery-type thermostat is constructed so that an electric connection of the power supply unit and the heating part is temporally blocked when a first temperature detected becomes a first threshold value or larger. The non-recover type current block device is constructed so that the electric connection of the power supply unit and the hating part is irreversibly blocked when a second temperature detected becomes a temperature of a second threshold value or larger. The temperature of the cocking container that becomes the first threshold value of the first temperature is lower than that in the heating unit when it becomes the second threshold value of the second temperature.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a cooking appliance. [Background technology]

[0002] Conventionally, a one-shot type thermostat is provided as a safety device in the event of an abnormally high temperature occurring in a heating unit, and cuts off the supply of power to a heating device (e.g., a heater) when a high temperature is detected. For example, Patent Document 1 discloses a cooking device that is provided with a thermostat that prevents an abnormal temperature rise in the heating chamber, and prevents overheating by activating the thermostat when an abnormal temperature rise occurs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-20309 Summary of the Invention [Problem to be solved by the invention]

[0004] When a one-shot thermostat provided in a cooking appliance detects a high temperature and operates to cut off an electrical connection, the cut-off electrical connection is configured not to be easily restored. In this case, a user of the cooking appliance is required to repair the cooking appliance in order to use the cooking appliance again, and such a cooking appliance may reduce the convenience for the user.

[0005] An object of the present disclosure is to provide a cooking device that improves safety in the event of overheating while improving convenience for the user. [Means for solving the problem]

[0006] A cooking appliance according to one embodiment of the present disclosure comprises a non-returnable current interruption device, a resettable thermostat, a heating unit having a heating unit electrically connected to a power supply unit via the non-returnable current interruption device and the resettable thermostat, a cooking container arranged in the heating unit, and a control unit configured to control the operation of the heating unit, wherein the resettable thermostat is arranged to primarily detect the temperature of the cooking container heated by the heating unit and is configured to temporarily cut off the electrical connection between the power supply unit and the heating unit when the detected first temperature becomes equal to or higher than a first threshold value, the non-returnable current interruption device is arranged to primarily detect the temperature in the heating unit heated by the heating unit and is configured to irreversibly cut off the electrical connection between the power supply unit and the heating unit when the detected second temperature becomes equal to or higher than a second threshold value, and the temperature of the cooking container when the first temperature becomes the first threshold value is lower than the temperature in the heating unit when the second temperature becomes the second threshold value. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a cooking device that improves safety in the event of overheating and improves convenience for the user. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a cooking device according to an embodiment; [Diagram 2] 2 is a schematic cross-sectional view of the cooking device shown in FIG. 1 taken along line II. [Diagram 3] FIG. 1 is a rear perspective view of a heating unit of a cooking device according to an embodiment; [Figure 4] Block diagram of a cooking device according to an embodiment. [Diagram 5] FIG. 1 is a schematic diagram showing a side operation panel of a cooking device according to an embodiment; [Figure 6] 1 is a schematic circuit diagram of a heating unit of a cooking device according to an embodiment; [Figure 7] A flowchart showing a process for checking for disconnection during heating of a cooking device according to an embodiment. [Figure 8]A flowchart showing a disconnection check process at the start of heating in a cooking device according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. However, the configuration described below is merely an example of the present disclosure, and the present disclosure is not limited to the following embodiment. The technology in the present disclosure is not limited to this, and various modifications, substitutions, additions, omissions, etc. are possible depending on the design, etc., even if it is other than these embodiments, as long as it does not deviate from the technical idea of ​​the present disclosure.

[0010] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications should be understood to be included within the scope of the present disclosure as defined by the appended claims unless they depart therefrom.

[0011] Conventionally, cooking appliances equipped with a one-shot thermostat are known as a safety device when an abnormally high temperature occurs in a heating unit such as a grill. In order to prevent a user from using an abnormal cooking appliance again, the one-shot thermostat is configured not to reset once it is activated, or at least not to reset under normal usage conditions. Cookers may become locally overheated due to user operation, not due to an abnormality in the cooking appliance. In this case, when the one-shot thermostat is activated, the user is required to repair the cooking appliance in order to use it again, even though there is no abnormality in the cooking appliance.

[0012] The cooking device according to the present disclosure includes a reset type thermostat in addition to the one-shot type thermostat. The reset type thermostat is configured to reset when the detected temperature drops even if it detects a high temperature and activates. The cooking device according to the present disclosure prevents overheating by activating the reset type thermostat in the event of local overheating as described above. Therefore, a user of the cooking device according to the present disclosure can use the cooking device again without repairing it even if the inside of the heating unit becomes abnormally high temperature and the safety device that stops heating in the heating unit is activated due to local overheating. In addition, since the cooking device includes a one-shot type thermostat, even if abnormal heating occurs due to an abnormality in the cooking device, the one-shot type thermostat can be activated to suppress overheating. Therefore, the cooking device according to the present disclosure can improve safety and convenience for the user.

[0013] (Embodiment) [composition] Fig. 1 shows a perspective view of a cooking device 1 according to an embodiment of the present disclosure. As shown in Fig. 1, the cooking device 1 includes a housing 2, a top plate 3, heating coils 4A to 4C, a heating unit 5, an upper operation panel 6, a side operation panel 7, and a control device 8.

[0014] Housing 2 has therein heating coils 4A to 4C, a heating unit 5, and a control device 8. Housing 2 has a top plate 3 on its upper surface. Housing 2 also has a side operation panel 7 on its side surface.

[0015] The top plate 3 is a mounting portion on which a container can be mounted. The container is an example of a heating object that is heated through one of the heating coils 4A to 4C. The top plate 3 is disposed on the upper surface of the housing 2. The top plate 3 is made of a material, such as glass, through which the magnetic field generated by the heating coils 4A to 4C can pass. An exhaust pipe 21 is connected to the top plate 3. The exhaust pipe 21 is configured to guide the air exhausted from the heating unit 5 to above the top plate 3.

[0016] An exhaust opening 9 is provided at the rear end of the top plate 3, penetrating the top plate 3 in its thickness direction. A cover 10 is provided on the exhaust opening 9. The exhaust tube 21 is fluidly connected to the upper surface of the top plate 3 via the exhaust opening 9. As an example, the exhaust opening 9 has a plurality of openings, each of which has a substantially rectangular shape. The exhaust opening 9 is an example of an exhaust port.

[0017] The heating coils 4A to 4C are an example of a heating unit that heats a container placed on the top plate 3. Hereinafter, when there is no need to distinguish between the heating coils 4A to 4C, they will be collectively referred to as the heating coil 4. The heating coil 4 is placed below the top plate 3. The heating coil 4 generates an induction magnetic field when a high-frequency current is supplied. The heating coil 4 heats the bottom surface of a container placed on the top plate 3, etc., with the magnetic field, thereby heating the object to be cooked contained in the container. In this embodiment, the heating unit performs induction heating through each of the heating coils 4A to 4C, but is not limited thereto. For example, the cooking device 1 may be configured to include another heating device such as a radiant heater or a halogen heater as at least one of the heating units, and the heating device may heat the object to be heated placed above the heating device.

[0018] As shown in FIG. 1, the cooking device according to this embodiment has three heating coils 4A to 4C, and is therefore capable of simultaneously heating three objects to be heated.

[0019] The heating unit 5 is an example of a so-called grill heating device. A part of the heating unit 5 is configured to be able to be pulled out from the front of the housing 2. The heating unit 5 is configured to be able to be pulled out from the housing 2 so that the user can access the inside.

[0020] The upper operation panel 6 is provided on the top plate 3. A user of the cooking appliance 1 can execute heating by the heating coil 4 by operating the upper operation panel 6.

[0021] The side operation panel 7 is provided on the front surface of the housing 2. The side operation panel 7 is configured to be able to be housed in the housing 2. A user of the cooking appliance 1 can execute heating by the heating unit 5 by operating the side operation panel 7. The side operation panel 7 has a side operation section 13 and a side display section 14. Details of the side operation section 13 and the side display section 14 will be described later.

[0022] The control device 8 is, for example, a computer, and includes an arithmetic circuit and a storage device. The control device 8 is an example of a control unit of the cooking device 1 according to the present disclosure.

[0023] The arithmetic circuit controls the overall operation of the cooking device 1. The arithmetic circuit may be either a circuit in which hardware resources and software work together to realize a predetermined function, or a circuit in which a dedicated hardware circuit is used to realize a predetermined function.

[0024] As an example of the former, the arithmetic circuit includes a general-purpose processor such as a CPU or MPU that executes a program to realize a predetermined process or function. The arithmetic circuit is configured to be able to communicate with a storage device. The arithmetic circuit reads out and executes an arithmetic program or the like stored in the storage device to realize various functions in the control device 8. As an example of the latter, the arithmetic circuit includes an FPGA or an ASIC. As can be understood from the above, the arithmetic circuit can be realized using a semiconductor integrated circuit such as a CPU, an MPU, a GPU, an FPGA, a DSP, or an ASIC.

[0025] The storage device is a storage medium that can store various information. The information includes programs and data. For example, the storage device stores an arithmetic program for implementing various functions according to the present embodiment. The storage device is implemented, for example, by a volatile or non-volatile semiconductor memory such as a DRAM, an SRAM, or a flash memory, an SSD, an HDD, or other storage devices, or an appropriate combination of these.

[0026] Fig. 2 is a schematic cross-sectional view of the cooking device 1 shown in Fig. 1 cut in the vertical direction along line II. As shown in Fig. 2, the heating unit 5 has an exhaust pipe 21, a grill door 22, and a grill chamber 23. The grill door 22 is provided in front of the heating unit 5. The heating unit 5 has a lower heater 24 and an upper heater 25 therein. Furthermore, as shown in Fig. 2, the cooking device 1 has a fan 26. Some parts including the heating coil 4 are omitted in Fig. 2.

[0027] The grill chamber 23 has, for example, a substantially rectangular parallelepiped shape and is configured to be able to accommodate an object to be heated therein. The grill chamber 23 is an example of a heating chamber for heating an object to be heated. The object to be heated includes, for example, foodstuffs such as fish. The grill chamber 23 has four side walls extending along the thickness direction of the top plate 3. The four side walls include a rear side wall 27 of the grill chamber 23. The rear side wall 27 is provided with an exhaust opening 28 connected to the exhaust pipe 21. The exhaust pipe 21 is fluidly connected to the grill chamber 23 of the heating unit 5 via the exhaust opening 28. As an example, the exhaust opening 28 has a substantially rectangular shape.

[0028] The exhaust pipe 21 fluidly connects the upper surface of the top plate 3 and the inside of the grill chamber 23 of the heating unit 5. As described above, one end of the exhaust pipe 21 is connected to the side wall portion 27 at the rear of the grill chamber 23. The other end of the exhaust pipe 21 is connected to the exhaust opening 9 of the top plate 3. The exhaust pipe 21 has a first exhaust port 29 and a second exhaust port 30 at the other end. The first exhaust port 29 exhausts the fluid discharged from the grill chamber 23. The second exhaust port 30 exhausts the fluid based on the wind generated by the fan 26 provided in the housing 2 of the cooking device 1. The fluid exhausted from the second exhaust port 30 can function as an air curtain for the wall behind the cooking device 1, for example.

[0029] In this embodiment, the exhaust pipe 21 includes a first duct portion 31 and a second duct portion 32. The first duct portion 31 has an end connected to the exhaust opening portion 9 of the top plate 3. The second duct portion 32 has an end connected to the exhaust opening portion 28 of the grill chamber 23. The exhaust pipe 21 may be a single part without being divided into the first duct portion 31 and the second duct portion 32.

[0030] The fan 26 is arranged to generate wind to cool, for example, the heating unit 5. The fan 26 may cool components other than the heating unit 5, such as the control device 8 and an electric circuit for operating the cooking appliance 1. The rotation speed of the fan 26 may be adjusted by the control device 8.

[0031] The heating unit 5 is configured so that the cooking container 33 is placed in the grill chamber 23. The cooking container 33 is, for example, a grill plate placed in the grill chamber 23. The cooking container 33 is configured so that it can be taken in and out of the grill chamber 23 through an opening that is created when the heating unit 5 is pulled out of the housing 2. An object to be heated can be placed on the cooking container 33.

[0032] The lower heater 24 is an example of a heating section that heats the inside of the grill chamber 23 and the cooking vessel 33. The lower heater 24 is also an example of a first heating section. In this embodiment, the lower heater 24 is disposed below the bottom surface of the grill chamber 23. The lower heater 24 has a greater effect on heating the cooking vessel 33 than the upper heater 25.

[0033] The upper heater 25 is an example of a heating section that heats the inside of the grill chamber 23 and the cooking vessel 33. The upper heater 25 is an example of a second heating section. In the present embodiment, the upper heater 25 is disposed in an upper portion within the grill chamber 23.

[0034] The heating unit 5 includes a thermistor 34. In this embodiment, the thermistor 34 is disposed on the grill chamber 23 side of the exhaust pipe 21, and can detect the temperature inside the heating unit 5. Specifically, in this embodiment, the thermistor 34 can detect the temperature inside the exhaust pipe 21. The thermistor 34 is an example of a temperature detection unit. The cooking appliance 1 may include a sensor capable of detecting temperature, such as an infrared sensor, instead of the thermistor 34 as the temperature detection unit. The control device 8 can acquire the temperature detected by the thermistor 34. The control device 8 can adjust the temperature inside the grill chamber 23 based on the temperature information acquired from the thermistor 34.

[0035] Fig. 3 is a rear perspective view of the heating unit 5 of the cooking device 1 according to the present embodiment. The cooking device 1 according to the present disclosure includes a plurality of thermostats 11, 12. The plurality of thermostats 11, 12 includes a first thermostat 11 and a second thermostat 12. Specifically, as shown in Fig. 3, the cooking device 1 includes a reset type thermostat 11 and a one-shot type thermostat 12 as the plurality of thermostats 11, 12. In the present embodiment, the reset type thermostat 11 and the one-shot type thermostat 12 are provided so as to be located at the rear of the grill chamber 23 of the heating unit 5.

[0036] The reset type thermostat 11 is arranged to detect a temperature (hereinafter, also referred to as "first temperature") associated with the temperature of the cooking container 33 of the heating unit 5 (hereinafter, also referred to as "container temperature" as appropriate). For example, the reset type thermostat 11 is arranged to predominantly detect the temperature of the cooking container 33 heated by the lower heater 24 and the upper heater 25. Predominantly detecting the temperature of the cooking container 33 means, for example, that the reset type thermostat 11 can mainly detect the temperature of the part heated based on the temperature of the cooking container 3 rather than the temperature inside the grill chamber 23. "Predominantly" does not necessarily mean being very strongly influenced, and may include, for example, being relatively predominantly, mainly, or overwhelmingly influenced. The same applies to the one-shot type thermostat 12 described below.

[0037] In this case, the first temperature is, for example, a temperature that is predominantly influenced by the container temperature. The reset type thermostat 11 may be arranged to detect the temperature in the vicinity of the cooking container 33 as the first temperature. The reset type thermostat 11 may be arranged in the vicinity of the outside of the part of the housing of the grill chamber 23 where the cooking container 33 is arranged, and may be arranged to detect the temperature of that part or the vicinity of that part as the first temperature. For example, the reset type thermostat 11 may be arranged so that the housing of the grill chamber 23 is located between the reset type thermostat 11 and the cooking container 33. In this embodiment, the reset type thermostat 11 is arranged on the back of the heating unit 5, but is not limited thereto. The reset type thermostat 11 may be arranged in a position where it is easy to detect a temperature rise caused by user misuse or the like.

[0038] The reset-type thermostat 11 has two terminals. The two terminals are electrically connected. The reset-type thermostat 11 is configured to cut off electrical continuity between the two terminals of the reset-type thermostat 11 when the detected first temperature becomes equal to or higher than a first threshold temperature (hereinafter, also referred to as the reset-type thermostat 11 operates). The reset-type thermostat 11 is configured to restore electrical continuity between the two terminals in a normal usage environment when the first temperature drops (hereinafter, also referred to as the reset-type thermostat 11 restores). In other words, the reset-type thermostat 11 is configured to temporarily cut off electrical connection between the two terminals in a normal usage environment when it detects a temperature equal to or higher than the first threshold temperature. Hereinafter, the first temperature at which the reset-type thermostat 11 returns to its original state is also referred to as the "return temperature" as appropriate. The return temperature and the first threshold temperature can be arbitrarily set to values ​​corresponding to predetermined container temperatures. The container temperature corresponding to the first threshold value is set arbitrarily, for example, in the range of 140°C or more and 180°C or less, and preferably in the range of 150°C or more and 160°C or less.

[0039] The reset type thermostat 11 may be configured to reset when the container temperature is equal to or higher than room temperature. The room temperature may be, for example, anywhere in the range of 5°C or higher and 35°C or lower. The container temperature corresponding to the reset temperature may be set to, for example, a temperature 20°C or higher lower than the container temperature corresponding to the first threshold value. For example, when the container temperature corresponding to the first threshold value is 140°C, the container temperature corresponding to the reset temperature may be 120°C. When the container temperature corresponding to the first threshold value is 180°C, the container temperature corresponding to the reset temperature may be 160°C. The reset type thermostat 11 may be set to reset, for example, when the container temperature is equal to or higher than room temperature and equal to or lower than 160°C. The normal use environment may be, for example, an environment in which the ambient temperature of the environment in which the cooking appliance 1 is placed is room temperature.

[0040] The one-shot thermostat 12 is arranged to detect a temperature (hereinafter, also referred to as "second temperature") associated with the temperature inside the grill chamber 23 of the heating unit 5 (hereinafter, also referred to as "internal temperature") as appropriate. The one-shot thermostat 12 is an example of a non-returnable current interruption device. The cooking appliance 1 may be provided with a temperature fuse instead of the one-shot thermostat 12 as a non-returnable current interruption device. For example, the one-shot thermostat 12 may be arranged to predominantly detect the temperature inside the heating unit 5 heated by the lower heater 24 and the upper heater 25. In this case, the second temperature is a temperature that is predominantly influenced by the internal temperature. For example, the one-shot thermostat 12 may be arranged to detect a temperature corresponding to the temperature of the fluid inside the grill chamber 23 of the heating unit 5 as the second temperature. The one-shot thermostat 12 may be arranged outside the housing of the grill chamber 23 of the heating unit 5 and to detect the temperature of the housing or the vicinity of the housing as the second temperature.

[0041] The one-shot thermostat 12 has two terminals. The two terminals are electrically connected. The one-shot thermostat 12 is configured to cut off electrical continuity between the two terminals of the one-shot thermostat 12 when it detects a temperature equal to or higher than the second threshold as the second temperature (hereinafter, also referred to as the one-shot thermostat 12 being activated). Unlike the resettable thermostat 11, the one-shot thermostat 12 is configured such that even if the second temperature drops, electrical continuity between the two terminals is not restored in a normal usage environment. In other words, in a normal usage environment, the one-shot thermostat 12 is configured to irreversibly cut off electrical connection between the two terminals. The second threshold can be arbitrarily set to a value corresponding to a predetermined internal temperature. The internal temperature corresponding to the second threshold is arbitrarily set, for example, in a range of 160°C to 200°C, preferably in a range of 170°C to 180°C.

[0042] One-shot thermostat 12 may be configured so that conduction does not return at least when the temperature inside grill chamber 23 is equal to or higher than room temperature. For example, one-shot thermostat 12 may be configured so that conduction returns when the temperature inside grill chamber 23 falls to minus 30° C. or lower. In this manner, the non-resettable current interrupter may be a device that restores electrical conduction at a temperature different from that in the normal usage environment. In this embodiment, the rated current of one-shot thermostat 12 is smaller than the rated current of resettable thermostat 11.

[0043] FIG. 4 is a block diagram showing the electrical connections of the above-mentioned components and the control device 8. As shown in FIG.

[0044] The control device 8 is electrically connected, directly or indirectly, to the top operation panel 6 and the side operation panel 7. The side operation panel 7 has a side operation unit 13 and a side display unit 14. The control device 8 is also electrically connected, directly or indirectly, to the inverter circuit. The control device 8 can control the operation of the heating coil 4 via the inverter circuit.

[0045] The upper operation panel 6 has a power supply operation section, an upper operation section, and an upper display section.

[0046] The power supply operation unit has a function of receiving an operation from a user and switching the power supply of the cooking appliance 1 on and off. An example of the power supply operation unit is a switch. When the user presses the power supply operation unit, the control device 8 switches the power supply of the cooking appliance 1 on and off.

[0047] The top surface operation unit has a function of accepting an operation from the user and switching the operation of the heating coil 4. An example of a top surface operation unit is a switch. The top surface display unit has a function of providing a display in response to an operation of the top surface operation unit by the user. An example of a top surface display unit is a display. The top surface display unit may provide a display in response to an operation by the user other than that of the top surface operation unit, such as a display showing the state of the cooking appliance 1. The top surface display unit can display, for example, the heating power of the heating coil 4, the remaining heating time, etc.

[0048] FIG. 5 is a schematic diagram of the side operation panel 7 of the cooking appliance 1 according to the present embodiment.

[0049] The side operation unit 13 has a function of receiving an operation from the user and switching the operation of the heating unit 5. An example of the side operation unit 13 is a switch. The side operation unit 13 is an example of an operation unit. By pressing the switch of the side operation unit 13, the user can switch the power of the heating unit 5 on and off, switch the cooking menu when operating the heating unit 5, and the like.

[0050] The side display unit 14 has a function of displaying information in response to the operation of the side operating unit 13 by the user. An example of the side display unit 14 is a display. The side display unit 14 is an example of a display unit or a notification unit. The side display unit 14 may display information due to reasons other than the operation of the side operating unit 13 by the user, such as a display indicating the state of the cooking appliance 1.

[0051] For example, the side display section 14 can display the temperature inside the heating unit 5. The side display section 14 can also display the remaining time for heating by the heating unit 5.

[0052] In the cooking device 1 according to the present embodiment, the control device 8 can operate the heating unit 5 in response to a user's operation of the side operation unit 13. When the control device 8 operates the heating unit 5, it can change the display of the side display unit 14 to notify the user that the heating unit 5 is operating and its operating state.

[0053] The side display unit 14 according to this embodiment can notify the user of an error based on a signal received from the control device 8. When the control device 8 detects an abnormality, it outputs an error signal based on the abnormality to the side display unit 14 to cause the side display unit 14 to display the error, thereby notifying the user that an abnormality has occurred. For example, the side display unit 14 can display an error code corresponding to the abnormality based on the received error signal. The cooking appliance 1 may be configured to include a speaker as the notification unit, and to notify the user of the error by the speaker by voice.

[0054] [Operation] Hereinafter, a disconnection check process for detecting an abnormality in the cooking appliance 1 according to the present embodiment will be described with reference to FIG.

[0055] Fig. 6 shows a schematic circuit diagram of the heating unit 5 of the cooking device 1 according to the present embodiment. As shown in Fig. 6, the cooking device 1 has, as a circuit related to the heating unit 5, a power supply unit 51, a power supply relay 52, a one-shot type thermostat 12, a reset type thermostat 11, a lower heater 24, an upper heater 25, a lower heater relay 53, and an upper heater relay 54. Also, as shown in Fig. 6, the power supply unit 51 of the cooking device 1 is connected to a power supply 60. The power supply 60 is, for example, a commercial AC power supply.

[0056] The power supply unit 51 converts the voltage of the power supply 60 into a predetermined voltage. The power supply unit 51 is an example of a power supply circuit.

[0057] The power relay 52 is a relay that switches the power supply of the heating unit 5 on and off. In the cooking device 1 according to the present embodiment, one end of the power relay 52 is connected to the power supply unit 51. The other end of the power relay 52 is connected to the one-shot thermostat 12. When the control device 8 detects that the user has pressed the power switch provided on the upper operation panel 6, it switches the power relay 52 between open and closed states.

[0058] One end of the one-shot thermostat 12 is connected to a power supply unit 51 via a power supply relay 52. ​​The other end of the one-shot thermostat 12 is connected to an upper heater 25. Furthermore, the one-shot thermostat 12 is connected to a lower heater 24 via a reset type thermostat 11.

[0059] 6, a first path 55 and a second path 56 are connected in parallel to the other end of the one-shot thermostat 12. The first path 55 includes the reset type thermostat 11, the lower heater 24, and the lower heater relay 53. The second path 56 includes the upper heater 25 and the upper heater relay 54. The other end of the one-shot thermostat 12 is connected between the reset type thermostat 11 and the upper heater 25.

[0060] One end of the reset type thermostat 11 is connected to the power supply unit 51 via the power supply relay 52 and the one-shot type thermostat 12. The other end of the reset type thermostat 11 is connected to the lower heater 24.

[0061] One end of the lower heater 24 is connected to a power supply unit 51 via a power supply relay 52, a one-shot type thermostat 12, and a reset type thermostat 11. The other end of the lower heater 24 is connected to a lower heater relay 53.

[0062] One end of the lower heater relay 53 is connected to the lower heater 24. The other end of the lower heater relay 53 is connected to the power supply unit 51. The control device 8 can control the opening and closing of the lower heater relay 53 based on predetermined conditions. For example, the control device 8 can control the opening and closing (i.e., on and off) of the lower heater relay 53 in response to a user pressing a button on the side operation unit 13. The control device 8 can also control the opening and closing of the lower heater relay 53 based on a temperature detected by the thermistor 34.

[0063] One end of the upper heater 25 is connected to a power supply unit 51 via a power supply relay 52 and a one-shot thermostat 12. The other end of the upper heater 25 is connected to an upper heater relay .

[0064] One end of the upper heater relay 54 is connected to the upper heater 25. The other end of the upper heater relay 54 is connected to the power supply unit 51. The control device 8 can control the opening and closing of the upper heater relay 54, similarly to the lower heater relay 53 described above.

[0065] In this embodiment, the control device 8 turns on the lower heater relay 53 and the upper heater relay 54 in response to a user pressing a button on the side operation unit 13. When the lower heater relay 53 is turned on, a closed circuit including the power supply unit 51 and the lower heater 24 is formed, and the lower heater 24 is activated. When the upper heater relay 54 is turned on, a closed circuit including the power supply unit 51 and the upper heater 25 is formed, and the upper heater 25 is activated. In this manner, the control device 8 can perform heating by the lower heater 24 and the upper heater 25.

[0066] The control device 8 can determine whether or not the inside of the grill chamber 23 of the heating unit 5 has reached a predetermined temperature based on the temperature detected by the thermistor 34 (hereinafter also referred to as the "third temperature" where appropriate). Furthermore, the control device 8 can maintain the temperature inside the grill chamber 23 at a predetermined temperature by switching the lower heater relay 53 and the upper heater relay 54 between open and closed based on the third temperature. In this way, the control device 8 can prevent the grill chamber 23 of the heating unit 5 from overheating by adjusting the temperature based on the information obtained from the thermistor 34.

[0067] In the cooking device 1, the temperature control by the control device 8 may not function due to a breakdown of a component or unusual use by the user, and overheating may occur in the grill chamber 23. Therefore, the cooking device 1 according to the present embodiment can prevent overheating of the grill chamber 23 even if an abnormality occurs. Examples of expected breakdowns include a breakdown of the thermistor 34, or a stuck contact of the lower heater relay 53 or the upper heater relay 54. Examples of unusual use by the user include misuse by the user. Examples of unusual use by the user include use of the heating unit 5 with the grill door 22 slightly open, or use of the heating unit 5 with a cooking vessel such as a pot placed on the exhaust opening 9 of the top plate 3.

[0068] The cooking device 1 according to the present embodiment has a one-shot thermostat 12 as an overheating prevention device. As described above, the one-shot thermostat 12 is configured to operate when it detects a temperature equal to or higher than the second threshold as the second temperature. The second temperature indicates a temperature associated with the temperature inside the grill chamber 23. The one-shot thermostat 12 is included in a closed circuit related to the lower heater 24 and a closed circuit related to the upper heater 25. Therefore, even if the lower heater relay 53 or the upper heater relay 54 is on, the one-shot thermostat 12 can cut off the electrical connection between the power supply unit 51 and the lower heater 24 and between the power supply unit 51 and the upper heater 25 when it operates. Thereby, the one-shot thermostat 12 can open each closed circuit.

[0069] Once the one-shot thermostat 12 is activated, the conduction in the one-shot thermostat 12 does not automatically return. Therefore, when the one-shot thermostat 12 is activated, the user of the cooking appliance 1 is required to have the cooking appliance 1 repaired in order to use the cooking appliance 1 again. As described above, overheating in the grill chamber 23 may occur due to user operation, rather than due to a failure of a component. If the cooking appliance 1 needs to be repaired even though no component is broken, user convenience is reduced.

[0070] In order to prevent such unnecessary repairs from occurring, the cooking device 1 according to this embodiment has a reset type thermostat 11 in addition to the one-shot type thermostat 12.

[0071] For example, when the grill door 22 is not completely closed and the heating unit 5 is operated, the lower heater 24 and the upper heater 25 perform heating, but air flows in from outside the heating unit 5. Therefore, the temperature inside the grill chamber 23 becomes lower than the temperature inside the chamber when it is used normally. This may result in a lower third temperature detected by the thermistor 34. If the third temperature becomes lower, the control device 8 may not be able to adjust the temperature normally and may keep the lower heater relay 53 and the upper heater relay 54 on. In this case, the cooking container 33 may become excessively hot because it is strongly affected by the heating by the lower heater 24. If the cooking container 33 becomes excessively hot, the cooking container 33 may be deformed or altered. Thus, even if no failure of the components occurs in the cooking device 1, local overheating may occur due to the way the user uses the cooking device.

[0072] Furthermore, for example, when the heating unit 5 is operated with a cooking vessel such as a pot placed on the exhaust opening 9 of the top plate 3, the exhaust air from the second exhaust port 30 flows back into the exhaust pipe 21 via the first exhaust port 29. As a result, the temperature inside the grill chamber 23 and the temperature inside the exhaust pipe 21 become lower than the temperatures in a normal operating state. This may result in a lower third temperature. Therefore, as in the above, the cooking appliance 1 may be locally overheated.

[0073] As described above, the reset-type thermostat 11 is configured to operate when the detected first temperature becomes equal to or higher than the first threshold temperature. The first temperature indicates a temperature corresponding to the temperature of the cooking vessel 33. The reset-type thermostat 11 is included in a closed circuit related to the lower heater 24. Therefore, even if the lower heater relay 53 is on, the reset-type thermostat 11 can cut off the electrical connection between the power supply unit 51 and the lower heater 24 and open the closed circuit when the cooking vessel 33 becomes hot.

[0074] After being activated, the reset-type thermostat 11 automatically resets when the first temperature drops to or below the reset temperature. As a result, even if the reset-type thermostat 11 is activated, the user can use the cooking appliance 1 again when the temperature drops to or below the reset temperature without having to send the cooking appliance 1 for repair. Therefore, the cooking appliance 1 according to the present disclosure can improve user convenience.

[0075] Cooking appliance 1 according to the present embodiment can display various errors on side display section 14 depending on the abnormality that has occurred.

[0076] The control device 8 can determine whether or not the closed circuit related to the lower heater 24 or the closed circuit related to the upper heater 25 is disconnected. In the present disclosure, the disconnection of the closed circuit includes, for example, a state in which a part of the closed circuit is opened by each relay or each thermostat. The control device 8 of the cooking device 1 according to the present embodiment can detect whether or not an abnormality has occurred in the current flow state of the first path 55 and the current flow state of the second path 56.

[0077] For example, as shown in Fig. 6, the control device 8 can obtain the potential of contact A between the lower heater 24 and the lower heater relay 53. The control device 8 can also obtain the potential of contact B between the upper heater 25 and the upper heater relay 54. Contact A is an example of a first contact. Contact B is an example of a second contact. As shown in Fig. 6, contact A is a contact located on the opposite side of the lower heater 24 from the reset-type thermostat 11 in the first path 55.

[0078] The control device 8 can determine whether or not the contact A is electrically connected to the power supply unit 51 by acquiring the potential of the contact A while the power supply relay 52 is on and the lower heater relay 53 is off. If the contact A is not electrically connected to the power supply unit 51, the control device 8 can determine that an abnormality has occurred in the current flow state of the first path 55. Even if the contact A is electrically connected to the power supply unit 51, if it is estimated that the contact A is electrically connected to the power supply unit 51 without the power supply relay 52, the control device 8 can determine that an abnormality has occurred in the current flow state of the first path 55. For example, if the contact A and the contact B are at the same potential while the power supply relay 52 is on, the lower heater relay 53 is off, and the upper heater relay 54 is on, the control device 8 can determine that the contact A is electrically connected to the power supply unit 51 without the power supply relay 52.

[0079] Similarly, the control device 8 can determine whether or not the contact B is electrically connected to the power supply unit 51 by acquiring the potential of the contact B while the power supply relay 52 is on and the upper heater relay 54 is off. When the contact B is not electrically connected to the power supply unit 51, the control device 8 can determine that an abnormality has occurred in the current flow state of the second path 56. Even if the contact B is electrically connected to the power supply unit 51, when it is estimated that the contact B is electrically connected to the power supply unit 51 without the power supply relay 52, the control device 8 can determine that an abnormality has occurred in the current flow state of the second path 56. For example, when the contact A and the contact B are at the same potential while the power supply relay 52 is on, the lower heater relay 53 is on, and the upper heater relay 54 is off, the control device 8 can determine that the contact B is electrically connected to the power supply unit 51 without the power supply relay 52. ​​By configuring in this way, the cooking appliance 1 does not need to include a component for detecting whether or not a break in the closed circuit has occurred, and therefore the cost can be reduced.

[0080] Hereinafter, the determination by the control device 8 as to whether or not the contact A is electrically connected to the power supply unit 51 will be referred to as a lower heater disconnection check. Also, the determination by the control device 8 as to whether or not the contact B is electrically connected to the power supply unit 51 will be referred to as an upper heater disconnection check. When it is not necessary to distinguish between the lower heater 24 and the upper heater 25, this will also be simply referred to as a disconnection check.

[0081] For example, the control device 8 can perform a lower heater open circuit check and an upper heater open circuit check by temporarily turning off the lower heater relay 53 and the upper heater relay 54 while heating is being performed by the heating unit 5. For example, the control device 8 may perform an open circuit check when temporarily turning off the lower heater relay 53 and the upper heater relay 54 for temperature adjustment.

[0082] If the result of executing the lower heater disconnection check shows that the potential of contact A varies based on the power supply unit 51, the control device 8 determines that contact A is electrically connected to the power supply unit 51. If the potential of contact A does not vary based on the power supply unit 51, the control device 8 determines that contact A is not electrically connected to the power supply unit 51.

[0083] If the result of executing the upper heater disconnection check shows that the potential of contact B varies based on the power supply unit 51, the control device 8 determines that contact B is electrically connected to the power supply unit 51. If the potential of contact B does not vary based on the power supply unit 51, the control device 8 determines that contact B is not electrically connected to the power supply unit 51.

[0084] When the control device 8 determines that the contacts A and B are not electrically connected to the power supply unit 51, it stops heating by the heating unit 5 and displays an error corresponding to the determination on the side display unit 14. When the control device 8 determines that the contacts A and B are not electrically connected to the power supply unit 51, it may determine that the one-shot thermostat 12 is activated. When the control device 8 determines that the contacts A and B are not electrically connected to the power supply unit 51, it may determine that the lower heater 24 and the upper heater 25 are disconnected.

[0085] When the control device 8 determines that the contact A is not electrically connected to the power supply unit 51 and that the contact B is electrically connected to the power supply unit 51, it determines that the reset-type thermostat 11 is activated. When the control device 8 determines that the contact A is not electrically connected to the power supply unit 51 and that the contact B is electrically connected to the power supply unit 51, it may determine that the lower heater 24 is disconnected. Then, the control device 8 stops heating by the heating unit 5 and causes the side display unit 14 to display an error corresponding to the activation of the reset-type thermostat 11.

[0086] When the control device 8 determines that the contact A is electrically connected to the power supply unit 51 and the contact B is not electrically connected to the power supply unit 51, it determines that the upper heater 25 is disconnected. Then, the control device 8 stops heating by the heating unit 5 and causes the side display unit 14 to display an error corresponding to the disconnection of the upper heater 25.

[0087] When the control device 8 determines that the contacts A and B are electrically connected to the power supply unit 51, it turns on the lower heater relay 53 and the upper heater relay 54, and causes the heating unit 5 to continue heating.

[0088] In this way, depending on the result of the disconnection check while the heating unit 5 is performing heating, the control device 8 displays an error on the side display unit 14 or continues heating.

[0089] Furthermore, when the heating unit 5 starts heating, the control device 8 can execute a lower heater breakage check and an upper heater breakage check.

[0090] When the control device 8 determines that the contacts A and B are not electrically connected to the power supply unit 51, it does not perform heating by the heating unit 5, and operates in the same manner as the above-mentioned disconnection check during heating.

[0091] When the control device 8 determines that the contact A is electrically connected to the power supply unit 51 and the contact B is not electrically connected to the power supply unit 51, it determines that the upper heater 25 is disconnected. In this case, the control device 8 does not perform heating by the heating unit 5, and operates in the same manner as the disconnection check during heating described above.

[0092] When the control device 8 determines that the contacts A and B are electrically connected to the power supply unit 51, it turns on the lower heater relay 53 and the upper heater relay 54, and starts heating by the heating unit 5.

[0093] The disconnection check at the start of heating may be performed after the above-mentioned disconnection check during heating. For example, if the resettable thermostat 11 is determined to be disconnected in the disconnection check during heating, the user can press the button on the side operation unit 13 to cause heating to be performed again by the heating unit 5. In this case, the temperature inside the grill chamber 23 of the heating unit 5 may be higher than the temperature inside the grill chamber 23 at any time other than after the disconnection check during heating. Therefore, in the disconnection check at the start of heating, the control device 8 uses the temperature detected by the thermistor 34.

[0094] When the control device 8 determines that the contact A is not electrically connected to the power supply unit 51 and that the contact B is electrically connected to the power supply unit 51, the control device 8 determines whether the third temperature detected by the thermistor 34 is equal to or higher than a third threshold value. The third threshold value is, for example, 65° C., but may be another temperature.

[0095] When the third temperature is equal to or higher than the third threshold value, the control device 8 determines that the resettable thermostat 11 is activated. Then, the control device 8 does not start heating by the heating unit 5, and causes the side display unit 14 to display an error corresponding to the activation of the resettable thermostat 11.

[0096] When the third temperature is less than the third threshold value, the control device 8 determines that the lower heater 24 is disconnected. Then, the control device 8 does not start heating by the heating unit 5, and causes the side display unit to display an error corresponding to the disconnection of the lower heater 24.

[0097] In this way, depending on the result of the disconnection check when the heating unit 5 starts heating, the control device 8 displays an error on the side display unit 14 or starts heating.

[0098] In the cooking appliance 1 according to the present embodiment, when the user performs a predetermined operation, the control device 8 erases the error displayed in response to the operation of the reset-type thermostat 11 from the side display unit 14. For example, the control device 8 may erase the error from the side display unit 14 when the user presses a button for starting heating by the heating unit 5. When the error is erased, the control device 8 can start heating by the heating unit 5 again in response to the user's operation.

[0099] In the cooking device 1 according to the present embodiment, the reset type thermostat 11 is provided with the intention of preventing overheating that may occur when a situation occurs due to a user's unusual use. In this situation, the cooking container 33 is overheated compared to the inside of the grill chamber 23. When the situation is resolved, the possibility of overheating decreases. If the cooking device is configured so that the one-shot type thermostat is activated when overheating occurs due to the situation, the user of the cooking device is required to repair the cooking device even though there is no abnormality in the cooking device. Since the cooking device 1 according to the present disclosure is configured so that the reset type thermostat 11 is activated when overheating occurs in the situation, the user can use the cooking device 1 again without repairing it. Therefore, the cooking device 1 according to the present disclosure can improve the convenience of the user.

[0100] In addition, the cooking device 1 according to the present disclosure is configured such that the one-shot thermostat 12 is activated when overheating occurs in a situation different from the above situation in which the cooking container 33 is overheated. The situation different from the above situation includes, for example, a failure of a component of the cooking device 1. In this case, if the user continues to use the cooking device 1 after the safety device is activated, overheating may continue and a fire may occur. Since the cooking device 1 according to the present disclosure includes the one-shot thermostat 12, for example, when overheating occurs due to a failure of a component of the cooking device 1, it is possible to prevent the user from reheating. Therefore, the cooking device 1 according to the present disclosure can improve safety.

[0101] In this way, the cooking device 1 according to the present embodiment includes both the reset type thermostat 11 and the one-shot type thermostat 12, thereby improving safety and improving user convenience. As described above, the reset type thermostat 11 detects a temperature corresponding to the temperature of the cooking container 33. The one-shot type thermostat 12 detects a temperature corresponding to the temperature inside the heating unit 5. As the thermostats 11 and 12 detect different temperatures in this way, the cooking device 1 according to the present embodiment is configured so that the thermostats 11 and 12 operate under conditions based on the components. As a result, the cooking device 1 can improve safety and improve user convenience.

[0102] 7 is a flow chart showing a wire break check process during heating by the control device 8 of the cooking appliance 1 according to the present embodiment. The control device 8 can execute the wire break check process at any timing during heating by the heating unit 5. For example, the control device 8 may execute the wire break check process during heating after the start of heating or when a predetermined period of time has elapsed since the previous wire break check process.

[0103] First, the control device 8 executes a lower heater disconnection check. The control device 8 judges whether or not an abnormality has occurred at the contact A (S11). For example, as described above, the control device 8 can judge whether or not the contact A is electrically connected to the power supply unit 51 by temporarily turning off the lower heater relay 53 and acquiring the potential of the contact A while it is off. If the contact A is not electrically connected to the power supply unit 51, the control device 8 can judge that an abnormality has occurred at the contact A. This allows the control device 8 to detect whether or not the electrical conduction state of the contact A is normal. An abnormality occurring at the contact A includes an abnormality in the electrical conduction state of the contact A.

[0104] When it is determined that no abnormality has occurred at contact A (S11: NO), the control device 8 executes an upper heater disconnection check. The control device 8 determines whether or not an abnormality has occurred at contact B, similar to contact A (S12). For example, as described above, the control device 8 can determine whether or not contact B is electrically connected to the power supply unit 51 by temporarily turning off the upper heater relay 54 and acquiring the potential of contact B while it is off. This allows the control device 8 to detect whether the current flow state of contact B is normal.

[0105] When it is determined that no abnormality has occurred at contact point B (S12: NO), control device 8 continues heating (S13) and ends the disconnection check process during heating.

[0106] If it is determined that an abnormality has occurred at contact B (S12: YES), the control device 8 determines that the upper heater 25 is disconnected. Then, the control device 8 outputs an error signal corresponding to the disconnection of the upper heater 25 to the side display unit 14 (S14). The side display unit 14 displays an error in response to the received error signal.

[0107] Furthermore, the control device 8 turns off the lower heater relay 53 and the upper heater relay 54 (i.e., opens the contacts of each relay) (S15). If the control device 8 determines that the upper heater 25 is disconnected, it turns off the lower heater relay 53 and the upper heater relay 54 to prevent heating by the lower heater 24 and the upper heater 25. Then, the control device 8 ends the disconnection check process during heating.

[0108] If it is determined that an abnormality has occurred at contact A (S11: YES), the controller 8 executes an upper heater disconnection check. As in step S12, the controller 8 determines whether an abnormality has occurred at contact B (S16).

[0109] When it is determined that an abnormality has occurred at contact B (S16: YES), the control device 8 determines that the one-shot thermostat 12 has been activated and the circuit in the one-shot thermostat 12 has been cut off. Then, the control device 8 outputs an error signal corresponding to the activation of the one-shot thermostat 12 to the side display unit 14 (S17). The error signal is an example of a third error signal. The side display unit 14 displays an error in response to the received error signal. Then, the control device 8 ends the open circuit check process during heating. When an abnormality has occurred at contact A and contact B, the control device 8 may determine that the lower heater 24 and the upper heater 25 are open circuited. Even in this case, the control device 8 may output to the side display unit 14 the same error signal as the error signal when the one-shot thermostat 12 has been activated.

[0110] If it is determined that no abnormality has occurred at contact B (S16: NO), the control device 8 determines that the resettable thermostat 11 has been activated and the circuit within the resettable thermostat 11 has been interrupted. The control device 8 then outputs an error signal corresponding to the activation of the resettable thermostat 11 to the side display unit 14 (S18). This error signal is an example of a first error signal. The side display unit 14 displays an error in response to the received error signal.

[0111] Furthermore, similarly to step S15, the control device 8 turns off the lower heater relay 53 and the upper heater relay 54 (S19). When the control device 8 determines that the reset type thermostat 11 is activated, it turns off the lower heater relay 53 and the upper heater relay 54 to prevent heating by the lower heater 24 and the upper heater 25. Then, the control device 8 ends the disconnection check process during heating.

[0112] 8 is a flowchart showing a wire breakage check process at the start of heating by the control device 8 of the cooking appliance 1 according to the present embodiment. This process can be performed when the user performs heating using the heating unit 5. This process can also be performed when the user performs heating using the heating unit 5 again after heating has stopped in the wire breakage check process during heating described above.

[0113] When the control device 8 detects that the button on the side operation unit 13 for activating heating by the heating unit 5 has been pressed (S31), the control device 8 executes a lower heater disconnection check. As in step S11, the control device 8 determines whether or not an abnormality has occurred at the contact A (S32).

[0114] If it is determined that no abnormality has occurred at contact A (S32: NO), the control device 8 executes an upper heater disconnection check. The control device 8 determines whether or not an abnormality has occurred at contact B, similar to contact A (S33).

[0115] When it is determined that no abnormality has occurred at contact B (S33: NO), the control device 8 starts heating by the heating unit 5 (S34). For example, the control device 8 can start heating by turning on the lower heater relay 53 and the upper heater relay 54. Then, the control device 8 ends the disconnection check process at the start of heating.

[0116] If it is determined that an abnormality has occurred at contact B (S33: YES), the control device 8 determines that the upper heater 25 is disconnected. Then, the control device 8 outputs an error signal corresponding to the disconnection of the upper heater 25 to the side display unit 14 (S35). The side display unit 14 displays an error in response to the received error signal. Then, the control device 8 ends the disconnection check process at the start of heating.

[0117] If it is determined that an abnormality has occurred at contact A (S32: YES), the controller 8 executes an upper heater disconnection check. As in step S33, the controller 8 determines whether an abnormality has occurred at contact B (S36).

[0118] When it is determined that an abnormality has occurred at contact B (S36: YES), the control device 8 determines that the one-shot thermostat 12 has been activated and the circuit in the one-shot thermostat 12 has been cut off. Then, the control device 8 outputs an error signal corresponding to the activation of the one-shot thermostat 12 to the side display unit 14 (S37). The error signal is an example of a third error signal. The side display unit 14 displays an error in response to the received error signal. Then, the control device 8 ends the disconnection check process at the start of heating. When an abnormality has occurred at contact A and contact B, the control device 8 may determine that the lower heater 24 and the upper heater 25 are disconnected. Even in this case, the control device 8 may output to the side display unit 14 the same error signal as the error signal when the one-shot thermostat 12 is activated.

[0119] When it is determined that no abnormality has occurred at the contact B (S36: NO), the control device 8 determines whether the temperature detected by the thermistor is equal to or higher than the third threshold value (S38). This temperature is an example of the third temperature as described above.

[0120] If the temperature is not equal to or higher than the third threshold (S38: NO), the control device 8 determines that the lower heater 24 is disconnected. Then, the control device 8 outputs an error signal corresponding to the disconnection of the lower heater 24 to the side display unit 14 (S39). The error signal is an example of a second error signal. Then, the control device 8 ends the disconnection check process at the start of heating.

[0121] If the temperature is equal to or higher than the third threshold (S38: YES), the control device 8 determines that the resettable thermostat 11 has been activated and the circuit within the resettable thermostat 11 has been cut off. The control device 8 then outputs an error signal corresponding to the activation of the resettable thermostat 11 to the side display unit 14 (S40). The error signal is an example of a first error signal. The side display unit 14 displays an error in response to the received error signal. The control device 8 then ends the disconnection check process at the start of heating.

[0122] [effect] According to the cooking device 1 of the present embodiment, the following effects can be achieved.

[0123] The cooking device 1 according to the embodiment of the present disclosure includes a non-returnable current interrupting device 12, a resettable thermostat 11, a heating unit 5, a cooking container 33 arranged in the heating unit 5, and a control unit 8. The heating unit 5 includes a heating unit 24 electrically connected to a power supply unit 51 via the non-returnable current interrupting device 12 and the resettable thermostat 11. The control unit 8 is configured to control the operation of the heating unit 24. The resettable thermostat 11 is arranged to predominantly detect the temperature of the cooking container 33 heated by the heating unit 24. The resettable thermostat 11 is configured to temporarily cut off the electrical connection between the power supply unit 51 and the heating unit 24 when the detected first temperature becomes equal to or higher than a first threshold temperature. The non-returnable current interrupting device 12 is arranged to predominantly detect the temperature in the heating unit 5 heated by the heating unit 24. The non-returnable current interruption device 12 is configured to irreversibly interrupt the electrical connection between the power supply unit 51 and the heating section 24 when the detected second temperature becomes equal to or higher than the second threshold value. The temperature of the cooking vessel 33 when the first temperature becomes the first threshold value is lower than the temperature in the heating unit 5 when the second temperature becomes the second threshold value.

[0124] According to this configuration, in the cooking device 1, when the first temperature reaches the first threshold before the second temperature reaches the second threshold, the resettable thermostat 11 is activated to temporarily cut off the electrical connection between the power supply unit 51 and the heating section 24. In this case, the non-resettable current interrupting device 12 does not cut off the electrical connection. When the first temperature drops, the resettable thermostat 11 electrically connects the power supply unit 51 and the heating section 24 again. Therefore, even if the temperature inside the heating unit 5 becomes abnormally high and the safety device that stops heating inside the heating unit 5 is activated due to local overheating, the user of the cooking device 1 can use the cooking device 1 again without repairing it. Also, when the second temperature reaches the second threshold before the first temperature reaches the first threshold, the non-resettable current interrupting device 12 is activated to irreversibly cut off the electrical connection. When the non-resettable current interrupting device 12 is activated, there is a possibility that the cooking device 1 is abnormal and overheating has occurred. In such a case, the cooking device 1 is configured to irreversibly cut off the electrical connection and to prevent the heating unit from operating even if the user attempts to use the cooking device 1 again. Thus, the cooking device 1 can improve the safety against overheating while improving the convenience for the user.

[0125] Furthermore, in the cooking appliance 1, when the connection by the resettable thermostat 11 is interrupted, the control unit 8 outputs a first error signal. According to this configuration, the control unit 8 can operate to notify the user that the resettable thermostat 11 has been activated. The user can determine the reason why the heating by the heating unit 5 has stopped based on the error, and can take action based on the reason. By notifying the user of the error based on the first error signal, the user can know that a safety device that does not require repair of the cooking appliance 1 has been activated due to overheating, and can understand the situation and use the cooking appliance 1 again. Therefore, according to the cooking appliance 1, the convenience of the user can be improved.

[0126] The cooking device 1 further includes a temperature detector 34 that detects a third temperature in the heating unit 5. When the control unit 8 detects that the electrical current flow state of the contact A on the electrical path of the heating unit 24 on the opposite side to the reset type thermostat 11 is abnormal when the heating unit 24 starts heating, the control unit 8 is configured to operate as follows. When the third temperature is equal to or higher than the third threshold value, the control unit 8 outputs a first error signal. When the third temperature is less than the third threshold value, the control unit 8 outputs a second error signal different from the first error signal in priority to the first error signal. According to this configuration, the control unit 8 can switch the error to be notified to the user based on the third temperature detected by the temperature detector 34. Based on the notified error, the user can understand what kind of safety device has been activated and can take the necessary measures. Therefore, the cooking device 1 can improve the convenience of the user.

[0127] In addition, in the cooking device 1, when the control unit 8 detects that the current flow state regarding the contact A is abnormal when heating by the heating unit 24 is started after detecting the interruption of the electrical connection between the power supply unit 51 and the contact A, the control unit 8 is configured to output the first error signal or the second error signal. With this configuration, even if the user uses the cooking device 1 again after the error is notified, if there is an abnormality in the current flow state, the control unit 8 can notify the user of the error again. Therefore, even if there is an abnormality in the heating unit 5 when heating is resumed, the control unit 8 can switch the error to be notified to the user. Based on the notified error, the user can understand what kind of safety device has been activated and can take the necessary measures. Therefore, the cooking device 1 can improve the convenience of the user.

[0128] The cooking device 1 further includes a first relay 53 and a second relay 54. The control unit 8 is configured to control the opening and closing of the first relay 53 and the second relay 54. The heating unit 24 is the first heating unit 24. The heating unit 5 further includes a second heating unit 25 electrically connected to the power supply unit 51 via the non-returnable current interrupting device 12. A first electrical path 55 and a second electrical path 56 are connected in parallel to the first heating unit 24 and the second heating unit 25 sides of the non-returnable current interrupting device 12. The first path 55 includes a resettable thermostat 11, the first heating unit 24, and the first relay 53 in series. The second path 56 includes a second heating unit 25 and the second relay 54 in series. The control unit 8 is configured to open the first relay 53 and the second relay 54 when it detects that the current flow state of the first path 55 is abnormal. According to this configuration, when an abnormality occurs in the current flow state of the first path 55, the control unit 8 can reliably stop heating in the heating unit 5 by outputting a control signal to open the first relay 53 and the second relay. Therefore, the cooking device 1 can improve safety.

[0129] In addition, in the cooking device 1, the first path 55 and the second path 56 are connected in parallel to the heating unit 24 side of the non-returnable current interruption device 12. The first path 55 is provided with the returnable thermostat 11 and the heating unit 24 in series. The control unit 8 outputs a first error signal when it detects that the electrical connection of the first path 55 is interrupted based on the current-carrying state of the first path 55 and the current-carrying state of the second path 56. With this configuration, the control unit 8 can determine whether an abnormality occurs on the first path 55 or on another path based on the current-carrying state of the first path 55 and the current-carrying state of the second path. For example, when there is an abnormality only in the current-carrying state of the first path 55, the control unit 8 can determine that an abnormality occurs on the first path 55 and output a first error signal. By notifying the user of the error based on the first error signal, the user can know that a safety device that does not require repair of the cooking appliance 1 has been activated due to overheating, and can grasp the situation and use the cooking appliance 1 again. Therefore, the cooking appliance 1 can improve user convenience.

[0130] In the cooking device 1, the control unit 8 is configured to detect whether the current flow state of the first contact A is normal or not through the first contact A on the path opposite to the resettable thermostat 11 of the heating unit 24 in the first path 55. The control unit 8 is configured to detect whether the current flow state of the second contact B is normal or not through the second contact B on the second path 56. When the control unit 8 detects that the current flow state of the first contact A and the current flow state of the second contact B are abnormal, the control unit 8 is configured to output a third error signal different from the first error signal in priority to the first error signal. According to this configuration, when the current flow state of the first contact A and the second contact B is abnormal, the control unit 8 can determine that the non-resettable current interrupter 12 is operating. Then, the control unit 8 notifies the user of an error corresponding to the operation of the non-resettable current interrupter 12, so that the user can understand that an abnormality has occurred in the cooking device 1 and that the cooking device 1 needs to be repaired. Therefore, the cooking device 1 can improve the convenience of the user.

[0131] In addition, in the cooking device 1, when the control unit 8 detects that the current flow state of the contact A on the electrical path of the heating unit 24 on the opposite side to the resettable thermostat 11 is abnormal during heating by the heating unit 24, it outputs a first error signal. According to this configuration, when the control unit 8 detects that there is an abnormality in the contact A during heating by the heating unit 5, it determines that the resettable thermostat 11 is operating and outputs a first error signal. By notifying the error based on the first error signal, the user can understand that a safety device that does not require repair of the cooking device 1 has been activated due to overheating, understand the situation, and can use the cooking device 1 again. Therefore, the cooking device 1 can improve user convenience.

[0132] Cooking device 1 further includes notification unit 14. When control unit 8 outputs a first error signal, notification unit 14 notifies an error based on the first error signal. With this configuration, control unit 8 can notify a user of an error through notification unit 14. The user can take necessary measures based on the error displayed on the notification unit. Therefore, cooking device 1 can improve user convenience.

[0133] Furthermore, in the cooking appliance 1, the rated current of the resettable thermostat 11 is smaller than the rated current of the non-resettable current interruption device 12. With this configuration, it is possible to use inexpensive parts as the resettable thermostat 11. Therefore, the cooking appliance 1 can be manufactured at a reduced cost.

[0134] (Other embodiments) In the present embodiment, the control device 8 detects the presence or absence of an abnormality in the current flow state based on the potentials of the contacts A and B, but is not limited to this. For example, a current sensor may be disposed at the contact A, and the control device 8 may detect the presence or absence of an abnormality in the current flow state based on the current value detected by the current sensor.

[0135] (Summary of aspects) As is apparent from the above description, the present disclosure includes the following aspects. In the following, reference symbols are given in parentheses only to clearly indicate the correspondence with the embodiments.

[0136] (Aspect 1) The cooking device (1) according to the present disclosure is A non-resettable current interruption device (12); A reset type thermostat (11); a heating unit (5) including a heating section (24) electrically connected to a power supply unit (51) via the non-reset type current interruption device and the reset type thermostat; a cooking vessel (33) disposed within the heating unit; A control unit (8) configured to control the operation of the heating unit; Equipped with the reset-type thermostat is arranged to primarily detect the temperature of the cooking vessel heated by the heating unit, and is configured to temporarily cut off an electrical connection between the power supply unit and the heating unit when the detected first temperature becomes equal to or higher than a first threshold value; the non-returnable current interruption device is arranged to primarily detect a temperature in the heating unit heated by the heating section, and is configured to irreversibly interrupt an electrical connection between the power supply unit and the heating section when the detected second temperature becomes equal to or higher than a second threshold value; The temperature of the cooking vessel when the first threshold value of the first temperature is reached is lower than the temperature in the heating unit when the second threshold value of the second temperature is reached.

[0137] (Aspect 2) In the cooking device (1) of aspect 1, when the connection by the resettable thermostat (11) is interrupted, the control unit (8) may output a first error signal.

[0138] (Aspect 3) The cooking device (1) of aspect 2 further includes a temperature detector (34) that detects a third temperature in the heating unit (5), When starting heating by the heating unit (24), if the control unit (8) detects that a current flow state of a contact (A) on an electrical path of the heating unit on the opposite side to the reset-type thermostat (11) is abnormal, If the third temperature is equal to or greater than a third threshold value, outputting the first error signal; When the third temperature is lower than the third threshold value, a second error signal different from the first error signal is output in preference to the first error signal. It may be configured as follows.

[0139] (Aspect 4) In the cooking device (1) of aspect 3, the control unit (8) may be configured to output the first error signal or the second error signal when detecting that an electrical connection between the power supply unit (51) and the contact (A) is interrupted and heating by the heating unit (24) is started, if the control unit (8) detects that an electrical current flow condition at the contact is abnormal.

[0140] (Aspect 5) The cooking device (1) of any one of Aspects 1 to 4 further includes a first relay (53) and a second relay (54), The control unit (8) is configured to control opening and closing of each of the first relay and the second relay, The heating section (24) is a first heating section (24), the heating unit (5) further includes a second heating section (25) electrically connected to the power supply unit (51) via the non-resettable current interruption device (12); A first electrical path (55) and a second electrical path (56) are connected in parallel to the first heating section and the second heating section of the non-resettable current interruption device, The reset-type thermostat (11), the first heating unit, and the first relay are provided in series in the first path, The second path includes a second heating unit and the second relay connected in series, The control unit may be configured to open the first relay and the second relay when it detects that a current flow state of the first path is abnormal.

[0141] (Aspect 6) In the cooking device (1) of aspect 1, a first electrical path (55) and a second electrical path (56) are connected in parallel to the heating section (24) of the non-resettable current interruption device (12); The reset-type thermostat (11) and the heating unit are provided in series in the first path, The control unit (8) may output a first error signal when it detects that the electrical connection of the first path is interrupted based on the current flow status of the first path and the current flow status of the second path.

[0142] (Aspect 7) In the cooking device (1) of Aspect 6, the control unit (8) a first contact (A) on a path of the first path (55) opposite to the reset-type thermostat (11) of the heating unit (24) is used to detect whether or not a current flow state of the first contact is normal; Detecting whether or not the electrical conduction state of the second contact is normal through a second contact (B) on the second path; When detecting that the energization state of the first contact and the energization state of the second contact are abnormal, a third error signal different from the first error signal is output in priority to the first error signal. It may be configured as follows.

[0143] (Aspect 8) In the cooking device (1) of aspect 2, when the control unit (8) detects, during heating by the heating unit (24), that a current flow state of a contact (A) on an electrical path of the heating unit on the opposite side to the reset-type thermostat (11) is abnormal, the control unit (8) may output the first error signal.

[0144] (Aspect 9) The cooking device (1) of any of aspects 2 to 8 may further include an alarm unit (14), and when the control unit (8) outputs the first error signal, the alarm unit may notify of an error based on the first error signal.

[0145] (Aspect 10) In the cooking device (1) of any one of Aspects 1 to 9, the resettable thermostat (11) may have a rated current smaller than the rated current of the non-resettable current interruption device (12).

[0146] (Embodiment 11) In the cooking device (1) of any one of embodiments 1 to 10, the non-resettable current interruption device (12) may be a non-resettable thermostat or a thermal fuse.

[0147] (Embodiment 12) In the cooking device (1) of any one of embodiments 1 to 11, the heating unit (5) may include a movable door (22) for allowing access to the interior of the heating unit.

[0148] (Aspect 13) The cooking device (1) of any one of Aspects 1 to 12 further includes a top plate (3) and an exhaust port (9) having an opening on an upper surface of the top plate, The heating unit (5) may be in fluid communication with the exhaust outlet.

[0149] In this specification, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as expressing or implying the relative importance or ranking of technical features. Features qualified as "first" and "second" expressly or imply the inclusion of one or more of that feature.

[0150] The cooking device described in the present disclosure is realized by cooperation of hardware resources, such as a processor and a memory, and software (computer program). [Industrial Applicability]

[0151] According to the present disclosure, it is possible to provide a cooking device that improves safety in the event of overheating while improving convenience for the user, and thus the cooking device can be suitably used in this type of industrial field. [Explanation of symbols]

[0152] 1 Cooker 2. Chassis 3 Top Plate 4 Heating coil 5 Heating Unit 6 Top operation panel 7 Side operation panel 8 Control device 11 Reset type thermostat 12 One-shot type thermostat 23 Grill room 24 Lower heater 25 Upper heater 34 Thermistor 51 Power supply unit 53 Lower heater relay 54 Upper heater relay 55 Route 1 56 Route 2 A First Contact B 2nd contact

Claims

1. A non-reset type current interruption device; A reset type thermostat, a heating unit including a heating section electrically connected to a power supply unit via the non-reset type current interruption device and the reset type thermostat; a cooking vessel disposed within the heating unit; A controller configured to control operation of the heating unit; Equipped with the reset-type thermostat is arranged to primarily detect the temperature of the cooking vessel heated by the heating unit, and is configured to temporarily cut off an electrical connection between the power supply unit and the heating unit when the detected first temperature becomes equal to or higher than a first threshold value; the non-returnable current interruption device is arranged to primarily detect a temperature in the heating unit heated by the heating section, and is configured to irreversibly interrupt an electrical connection between the power supply unit and the heating section when the detected second temperature becomes equal to or higher than a second threshold value; the temperature of the cooking vessel when the first threshold value of the first temperature is reached is lower than the temperature in the heating unit when the second threshold value of the second temperature is reached; Heating cooker.

2. The cooking device according to claim 1 , wherein the control unit outputs a first error signal when the connection by the reset-type thermostat is interrupted.

3. Further comprising a temperature detector that detects a third temperature in the heating unit, When the control unit detects that a current flow state of a contact on an electrical path of the heating unit on an opposite side to the reset-type thermostat is abnormal when starting heating by the heating unit, If the third temperature is equal to or greater than a third threshold value, outputting the first error signal; When the third temperature is less than the third threshold value, a second error signal different from the first error signal is output in preference to the first error signal. The cooking device according to claim 2 , which is configured as described above.

4. the control unit is configured to output the first error signal or the second error signal when detecting that a current flow state regarding the contact is abnormal when starting heating by the heating unit after detecting interruption of an electrical connection between the power supply unit and the contact. The cooking device according to claim 3.

5. Further comprising a first relay and a second relay; The control unit is configured to control opening and closing of each of the first relay and the second relay, The heating unit is a first heating unit, The heating unit further includes a second heating section electrically connected to the power supply unit via the non-resettable current interruption device, A first electrical path and a second electrical path are connected in parallel to the first heating portion and the second heating portion of the non-resettable current interrupting device, The reset type thermostat, the first heating unit, and the first relay are provided in series in the first path, The second path includes a second heating unit and the second relay connected in series, The control unit is configured to open the first relay and the second relay when detecting that a current flow state of the first path is abnormal. The cooking device according to any one of claims 1 to 4.

6. A first electrical path and a second electrical path are connected in parallel to the heating portion side of the non-resettable current interruption device, The first path includes the reset type thermostat and the heating unit provided in series, When the control unit detects that the electrical connection of the first path is interrupted based on a current flow state of the first path and a current flow state of the second path, the control unit outputs a first error signal. The cooking device according to claim 1 .

7. The control unit is Detecting whether or not a current flow state of the first contact is normal through a first contact on a path of the heating unit on an opposite side to the reset-type thermostat in the first path; Detecting whether a current flow state of the second contact is normal or not through a second contact on the second path; when detecting that the energization state of the first contact and the energization state of the second contact are abnormal, outputting a third error signal different from the first error signal in priority to the first error signal. The cooking device according to claim 6, which is configured as described above.

8. The heating cooker according to claim 2, wherein the control unit outputs the first error signal when it detects that an electrical current condition of a contact on an electrical path of the heating unit opposite the reset type thermostat during heating by the heating unit is abnormal.

9. The cooking device according to claim 2 , further comprising an annunciation unit, wherein when the control unit outputs the first error signal, the annunciation unit notifies of an error based on the first error signal.

10. The cooking device according to claim 1 , wherein a rated current of the resettable thermostat is smaller than a rated current of the non-resettable current interruption device.

11. The cooking appliance according to claim 1 , wherein the non-resettable current interruption device is a non-resettable thermostat or a thermal fuse.

12. The cooking device according to claim 1 , wherein the heating unit includes a movable door for providing access to an interior of the heating unit.

13. The gas supply device further includes a top plate and an exhaust port having an opening on an upper surface of the top plate, the heating unit is fluidly connected to the exhaust port; The cooking device according to claim 1 .

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