JP2022066688A - Heating cooker - Google Patents

Abstract

To provide a technique capable of quickly reducing the fire power of a burner when a trouble arises in a cooler.SOLUTION: A heating cooker disclosed in the description of the present invention comprises: a burner; a heating chamber; a blower; an exhaust duct; a first air passage extending along an upper face of the heating chamber and surrounding the circumference of the exhaust duct; a second air passage extending along an upper face of the first air passage; a circuit board disposed in the second air passage; a cooling device disposed in the second air passage; and a temperature sensor disposed in the second air passage. The exhaust duct comprises a communication port communicating with the first air passage. The temperature sensor is disposed to face a position whereon exhaust flowing into the first air passage via the communication port from the exhaust port, flows. The heating cooker restricts the fire power of the burner when a temperature detected by the temperature sensor satisfies a prescribed condition.SELECTED DRAWING: Figure 1

Description

The techniques disclosed herein relate to cookers.

Patent Document 1 discloses a cooking device. The heating cooker includes a burner, a heating chamber for accommodating an object to be heated, a blower for sending combustion gas from the burner to the heating chamber, an exhaust duct through which exhaust gas from the heating chamber flows, and the heating chamber. A first that extends along the upper surface of the air and surrounds the exhaust duct, and air that flows in from the outside through the first air supply port and flows out to the outside through the first exhaust port passes through. A second air passage that extends along the upper surface of the air passage and the first air passage, and allows air that flows in from the outside through the second air supply port and flows out to the outside through the second exhaust port. A circuit board arranged in the second air passage, a cooling device arranged in the second air passage, and a temperature sensor arranged in the second air passage are provided. The cooking cooker limits the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition.

Japanese Unexamined Patent Publication No. 2019-20014

In the above-mentioned cooking cooker, even if some abnormality occurs in the cooling device and the temperature of the second air passage rises, the temperature detected by the temperature sensor rises relatively slowly, so that the abnormality occurs. It takes some time to detect. The present specification provides a technique capable of quickly reducing the thermal power of a burner when an abnormality occurs in a cooling device.

The heating cooker disclosed in the present specification includes a burner, a heating chamber for accommodating an object to be heated, a blower for sending combustion gas from the burner to the heating chamber, and an exhaust duct through which exhaust gas from the heating chamber flows. The air that extends along the upper surface of the heating chamber and surrounds the exhaust duct, flows in from the outside through the first air supply port, and flows out to the outside through the first exhaust port. The air that extends along the upper surface of the first air passage and the first air passage through which the air passes, and the air that flows in from the outside through the second air supply port and flows out to the outside through the second exhaust port passes through. A second air passage, a circuit board arranged in the second air passage, a cooling device arranged in the second air passage, and a temperature sensor arranged in the second air passage are provided. There is. The exhaust duct has a communication port that communicates with the first air passage. The temperature sensor is arranged so as to face a position where the exhaust gas flowing from the exhaust duct to the first air passage through the communication port flows. The cooking cooker limits the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition.

According to the above configuration, while the heating cooker is performing the heating operation, the temperature sensor is cooled by the cooling device arranged in the second air passage, and the first air is cooled from the exhaust duct through the communication port. It is heated by heat transfer from the exhaust gas that has flowed into the passage. Therefore, if an abnormality occurs in the cooling device while the cooking cooker is executing the heating operation, the temperature detected by the temperature sensor rises sharply. With such a configuration, when an abnormality occurs in the cooling device, the occurrence of the abnormality in the cooling device can be promptly detected by the temperature sensor, and the thermal power of the burner can be limited. Further, according to the above configuration, when the heating cooker is not performing the heating operation, the temperature sensor is not heated by the heat transfer from the exhaust gas. Therefore, for example, the residual heat of the heating chamber is used to heat the temperature sensor. Even when the temperature rises, the detection temperature of the temperature sensor does not become so high. With such a configuration, even if the temperature detected by the temperature sensor rises due to a cause other than the occurrence of an abnormality in the cooling device, it is possible to prevent erroneous detection that an abnormality has occurred in the cooling device. can do.

In the cooking device, the exhaust duct may have a flow path narrowing portion having a flow path area narrower than that on the downstream side. The communication port may be arranged on the downstream side of the flow path throttle portion.

According to the above configuration, more exhaust gas can flow out from the exhaust duct to the first air passage through the communication port due to the diffusion effect of the exhaust gas flowing downstream from the flow path throttle portion. When an abnormality occurs in the cooling device, the temperature rise detected by the temperature sensor can be made more rapid, and the occurrence of the abnormality in the cooling device can be quickly detected.

The cooking cooker is arranged inside the exhaust duct, and may further include a guide member for guiding the exhaust gas toward the communication port.

According to the above configuration, more exhaust gas can be discharged from the exhaust duct to the first air passage through the communication port. When an abnormality occurs in the cooling device, the temperature rise detected by the temperature sensor can be made more rapid, and the occurrence of the abnormality in the cooling device can be quickly detected.

The heating cooker is arranged in the first air passage, and the exhaust gas flowing from the exhaust duct into the first air passage through the communication port flows toward the first air supply port. A backflow prevention member for preventing this may be further provided.

According to the above configuration, it is possible to prevent the exhaust gas that has flowed into the first air passage from the exhaust duct through the communication port from flowing back through the first air passage and flowing out from the first air supply port. can.

In the cooking device, the temperature sensor may be arranged at a position facing the communication port across the first air passage.

According to the above configuration, the temperature sensor can be easily heated by heat transfer from the exhaust gas. When an abnormality occurs in the cooling device, the temperature rise detected by the temperature sensor can be made more rapid, and the occurrence of the abnormality in the cooling device can be quickly detected.

In the cooking device, the temperature sensor may be arranged on an inclined plate inclined with respect to the horizontal.

According to the above configuration, even if a liquid such as a boiling spill enters the second air passage, the liquid does not stay in the inclined plate, so that the temperature of the liquid entering the second air passage is the temperature of the temperature sensor. It is possible to suppress the influence on the detection.

It is a figure which shows the schematic structure of the heating cooker 10 of an Example. It is a vertical sectional view of the vicinity of the exhaust duct 44 of the cooking apparatus 10 of an Example. It is a perspective view of the flow path member 51 of the heating cooker 10 of an Example. It is a flowchart which shows the process which the control board 68 of the heating cooker 10 of an Example performs. It is a vertical sectional view of the vicinity of the exhaust duct 44 of the heating cooker 10 of a modification. It is a vertical sectional view in the vicinity of the exhaust duct 44 of the cooking apparatus 10 of another modification.

(Example)
The cooking device 10 of this embodiment shown in FIG. 1 is a convection oven used for business purposes. The cooking cooker 10 includes a housing 12, a heating cabinet 14, a burner chamber 16, a circulation fan chamber 18, an electrical component chamber 20, and a fan motor chamber 21. The heating chamber 14, the burner chamber 16, the circulation fan chamber 18, the electrical component chamber 20, and the fan motor chamber 21 are housed inside the housing 12.

The heating cabinet 14 includes a plurality of trays 22 arranged side by side in the vertical direction. A heated object W such as a food material or a cooking container can be placed on each tray 22. The user can put the heated object W in and out of the heating chamber 14 with the front door 24 open. The front door 24 can be opened and closed by rotating the front door 24 back and forth with respect to the housing 12 with the lower end of the front door 24 as a rotation axis.

The burner chamber 16 is arranged below the heating chamber 14. The burner chamber 16 is provided with a burner 26 for burning fuel gas. Fuel gas is supplied to the burner 26 from a gas supply pipe (not shown). The gas supply pipe is provided with a gas on-off valve and a gas flow rate adjusting valve (not shown). When an igniter (not shown) performs an ignition operation with the gas on-off valve of the gas supply pipe open, the burner 26 ignites. The thermal power of the burner 26 can be adjusted by adjusting the opening degree of the gas flow rate adjusting valve of the gas supply pipe during the combustion of the burner 26. If the gas on-off valve of the gas supply pipe is closed during the combustion of the burner 26, the burner 26 is extinguished. An air supply port 28 into which air flows in from the outside is provided at the front end of the burner chamber 16. The rear end of the burner chamber 16 communicates with the lower end of the combustion gas passage 30.

The combustion gas passage 30 extends in the vertical direction along the rear surface of the heating chamber 14. A filter 32 is arranged between the heating chamber 14 and the combustion gas passage 30. A circulation fan chamber 18 is arranged behind the combustion gas passage 30. The combustion gas passage 30 and the circulation fan chamber 18 communicate with each other through the opening 34.

A circulation fan 36 is arranged in the circulation fan chamber 18. The circulation fan 36 is rotationally driven by the fan motor 38. The fan motor 38 is arranged in the fan motor chamber 21. The fan motor chamber 21 is arranged behind the circulation fan chamber 18. The lower portion of the circulation fan chamber 18 communicates with the rear end of the circulation passage 40. The front end of the circulation passage 40 is open at the bottom of the heating chamber 14.

The front end of the exhaust passage 42 communicates with the uppermost portion of the heating chamber 14. The rear end of the exhaust passage 42 communicates with the lower end of the exhaust duct 44. The exhaust duct 44 extends in the vertical direction. The upper end of the exhaust duct 44 is open in the cooling passage 46. The upper end of the cooling passage 46 communicates with the exhaust port 48 formed on the upper surface of the housing 12. The opening at the upper end of the exhaust duct 44 faces the exhaust port 48.

At the lower end of the fan motor chamber 21, an air supply port 23 into which air flows in from the outside is provided. The lower end of the cooling duct 25 communicates with the front upper part of the fan motor chamber 21. The cooling duct 25 is arranged behind the exhaust duct 44 and adjacent to the exhaust duct 44. The cooling duct 25 extends in the vertical direction. The upper end of the cooling duct 25 is open in the cooling passage 46. The opening at the upper end of the cooling duct 25 faces the exhaust port 48.

In the cooking device 10, when the circulation fan 36 is rotated to burn the burner 26, the combustion gas from the burner 26 flows from the burner chamber 16 to the circulation fan chamber 18 via the combustion gas passage 30 and circulates. It is sent to the bottom of the heating chamber 14 via the passage 40. The combustion gas that has flowed into the heating chamber 14 flows around the heated object W placed on the tray 22 to heat the heated object W. A part of the combustion gas in the heating chamber 14 is sucked into the combustion gas passage 30 through the filter 32 by the rotation of the circulation fan 36, and again passes through the circulation fan chamber 18 and the circulation passage 40 in the heating chamber 14. It is sent to the bottom of. The remaining combustion gas in the heating chamber 14 flows into the exhaust duct 44 through the exhaust passage 42, flows from the upper end of the exhaust duct 44 toward the exhaust port 48, and is discharged to the outside of the housing 12. The combustion air of the burner 26 is sucked into the burner chamber 16 from the outside of the housing 12 through the air supply port 28 by the rotation of the circulation fan 36.

The cooling passage 46 is arranged above the heating chamber 14, the combustion gas passage 30, the circulation fan chamber 18, and the exhaust passage 42. The cooling passage 46 covers the upper surfaces of the heating chamber 14 and the exhaust passage 42, and surrounds the exhaust duct 44 and the cooling duct 25. An air supply port 50 is formed at the front end of the cooling passage 46.

The front door 24 includes an inner cooling passage 52 and an outer cooling passage 54. The inner cooling passage 52 is formed so as to cover the front surface of the heating chamber 14. The outer cooling passage 54 is formed so as to cover the front surface of the inner cooling passage 52. At the lower end of the inner cooling passage 52, an air supply port 56 into which air flows in from the outside is formed. At the lower end of the outer cooling passage 54, an air supply port 58 into which air flows in from the outside is formed. The upper end of the inner cooling passage 52 communicates with the outer cooling passage 54 through the opening 60. An exhaust port 62 is formed on the rear surface of the uppermost portion of the outer cooling passage 54. The exhaust port 62 is arranged at a position close to and facing the air supply port 50 of the cooling passage 46 when the front door 24 is closed.

When the heating cooker 10 heats the object to be heated W in the heating chamber 14 by the combustion gas, it is pulled by the flow of the exhaust gas discharged from the exhaust duct 44 to the exhaust port 48, and the air in the cooling passage 46 is pulled. Is also discharged to the exhaust port 48. Due to this air flow, air flows into each of the air supply port 56 and the air supply port 58 of the front door 24. The air flowing into the air supply port 56 flows from the lower side to the upper side through the inner cooling passage 52, and then flows into the outer cooling passage 54 through the opening 60. The air flowing into the air supply port 58 flows from the lower side to the upper side in the outer cooling passage 54. Due to the flow of air flowing through the inner cooling passage 52 and the outer cooling passage 54, it is possible to prevent the front surface of the front door 24 from becoming hot due to the heat from the heating chamber 14. The air that has flowed to the upper end of the outer cooling passage 54 is discharged from the exhaust port 62 and flows into the cooling passage 46 through the air supply port 50. The air flowing into the cooling passage 46 flows from the front to the rear along the upper surface of the heating chamber 14, and then is discharged from the exhaust port 48.

Further, when the heating cooker 10 heats the object to be heated W in the heating chamber 14 by the combustion gas, it is pulled by the flow of the exhaust gas discharged from the exhaust duct 44 to the exhaust port 48, and is inside the cooling duct 25. The air is also discharged to the exhaust port 48. Due to this air flow, air flows into the air supply port 23 of the fan motor chamber 21. The air flowing into the air supply port 23 flows from the lower side to the upper side of the fan motor chamber 21, and then flows from the lower side to the upper side of the cooling duct 25. The air flow in the fan motor chamber 21 cools the fan motor 38 arranged inside the fan motor chamber 21. As a result, it is possible to prevent the fan motor 38 from becoming hot due to the heat from the heating chamber 14.

The electrical component chamber 20 is located above the heating chamber 14 and in front of the exhaust duct 44. A cooling passage 46 is interposed between the electrical component chamber 20 and the heating chamber 14. Further, a cooling passage 46 is also interposed between the electrical component chamber 20 and the exhaust duct 44. An operation board 64 is arranged at the front end of the electrical component chamber 20. The operation board 64 is connected to an operation panel 66 provided on the front surface of the housing 12. The operation panel 66 includes a display unit (not shown) that displays the state of the cooking cooker 10 to the user, and an operation unit (not shown) that accepts an operation input to the cooking cooker 10 from the user. The operation board 64 is a circuit board that controls the operation of the display unit of the operation panel 66 and detects the operation input from the user to the operation unit of the operation panel 66. A control board 68 is arranged behind the operation board 64 of the electrical equipment room 20. The control board 68 is connected to the operation board 64. The control board 68 is a circuit board that controls the operation of each electric component of the cooking device 10.

As described above, when the heating cooker 10 heats the object to be heated W in the heating chamber 14 by the combustion gas, air flows in the cooling passage 46 between the electrical component chamber 20 and the heating chamber 14. Therefore, it is possible to prevent the electrical component chamber 20 from becoming hot due to the heat from the heating chamber 14. Further, when the heating cooker 10 heats the object to be heated W in the heating chamber 14 by the combustion gas, air flows in the cooling passage 46 between the electrical component chamber 20 and the exhaust duct 44. Therefore, it is possible to prevent the electrical component chamber 20 from becoming hot due to the heat from the exhaust duct 44.

The front end of the electrical component chamber 20 communicates with the air supply port 70 formed on the front surface of the housing 12. The rear end of the electrical component chamber 20 communicates with an exhaust port 72 formed on the upper surface of the housing 12. A cooling fan 74 is arranged behind the control board 68 of the electrical component room 20. The cooling fan 74 is rotationally driven by a fan motor (not shown). When the cooling fan 74 rotates, air flows from the outside of the housing 12 into the electrical component chamber 20 through the air supply port 70, and air flows from the electrical component chamber 20 to the outside of the housing 12 through the exhaust port 72. leak. The air flow in the electrical component chamber 20 cools the operation board 64 and the control board 68 arranged inside the electrical component chamber 20. A substantially horizontal bottom plate 75 is provided in the lower portion of the electrical component chamber 20, and the lower portion of the rear end of the electrical component chamber 20 is bent upward from the rear end of the bottom plate 75, and is more than horizontal. An inclined inclined plate 76 is provided. The inclined plate 76 is provided with a temperature sensor 78. The temperature sensor 78 is arranged at a position facing the exhaust duct 44 with the cooling passage 46 interposed therebetween.

As shown in FIG. 2, a flow path narrowing portion 47 is formed in the lower portion of the exhaust duct 44 by a wall member 45 provided in the lower rear portion of the exhaust duct 44. The flow path area of the flow path throttle portion 47 is smaller than the flow path area of the exhaust duct 44 on the downstream side of the flow path throttle portion 47 (that is, above the wall member 45). A communication port 49 is formed on the front surface of the exhaust duct 44 on the downstream side of the flow path narrowing portion 47. The communication port 49 is arranged at a position facing the temperature sensor 78 with the inclined plate 76 of the electrical component chamber 20 interposed therebetween.

As shown in FIG. 3, a flow path member 51 is attached to the communication port 49 of the exhaust duct 44. The flow path member 51 includes a lower guide plate 53 extending in the cooling passage 46 from the lower end of the communication port 49 toward the inclined plate 76 of the electrical component chamber 20, and a cooling passage from the right end of the communication port 49 toward the inclined plate 76. A right guide plate 55 extending inside the 46 and a left guide plate 57 extending inside the cooling passage 46 from the left end of the communication port 49 toward the inclined plate 76 are provided. The right end of the lower guide plate 53 is connected to the lower end of the right guide plate 55. The left end of the lower guide plate 53 is connected to the lower end of the left guide plate 57. The lower guide plate 53, the right guide plate 55, and the left guide plate 57 are not in contact with the inclined plate 76 of the electrical component chamber 20. Therefore, even when the exhaust duct 44 becomes hot, it is suppressed that the electric component chamber 20 becomes hot due to heat transfer through the flow path member 51.

When the heating cooker 10 heats the object to be heated W in the heating chamber 14 with the combustion gas, a part of the exhaust gas flowing through the exhaust duct 44 flows into the cooling passage 46 through the communication port 49. The high-temperature exhaust gas that has flowed into the cooling passage 46 through the communication port 49 is guided by the flow path member 51, flows along the inclined plate 76 of the electrical component chamber 20, and then is discharged from the exhaust port 48. The exhaust gas flowing into the cooling passage 46 is suppressed from flowing to the upstream side of the cooling passage 46 by the lower guide plate 53.

When the heating cooker 10 heats the object to be heated W in the heating chamber 14 by the combustion gas, the temperature sensor 78 passes through the inclined plate 76 from the exhaust gas flowing into the cooling passage 46 through the communication port 49. It is heated by the heat transfer. On the other hand, the temperature sensor 78 is cooled by the flow of air flowing in the electrical component chamber 20 by the rotation of the cooling fan 74. Therefore, if the cooling fan 74 is operating normally when the cooking device 10 is performing the heating operation, the temperature sensor 78 does not become so hot. On the other hand, when the heating cooker 10 is in the heating operation and the cooling fan 74 is not operating normally, the temperature sensor 78 becomes hot. Therefore, by monitoring the temperature of the temperature sensor 78 while the cooking device 10 is performing the heating operation, it is possible to determine whether or not the cooling fan 74 has an abnormality.

Hereinafter, the operation of the cooking device 10 will be described with reference to FIG. When the user instructs the start of the heating operation via the operation panel 66, the control board 68 executes the process shown in FIG.

In S2, the control board 68 drives the cooling fan 74.

In S4, the control board 68 drives the circulation fan 36.

In S6, the control board 68 ignites the burner 26. As a result, heating of the object to be heated W in the heating chamber 14 is started.

In S8, the control board 68 determines whether or not the temperature detected by the temperature sensor 78 exceeds the upper limit temperature (for example, 200 ° C.). When the temperature detected by the temperature sensor 78 exceeds the upper limit temperature (YES), the control board 68 determines that an abnormality has occurred in the cooling fan 74, and the process proceeds to S10.

In S10, the control board 68 extinguishes the burner 26.

In S12, the control board 68 stops the circulation fan 36.

In S14, the control board 68 stops the cooling fan 74.

In S16, the control board 68 notifies the user that the heating operation has ended abnormally via the operation panel 66. After S16, the process of FIG. 4 ends.

In S8, when the temperature detected by the temperature sensor 78 is equal to or lower than the upper limit temperature (NO), the process proceeds to S18.

In S18, the control board 68 determines whether or not the elapsed time from igniting the burner 26 in S6 has reached a predetermined time (for example, 30 minutes). The predetermined time is a preset time as the time required for the heating operation of the cooking device 10. If the elapsed time has not reached the predetermined time (NO), the process returns to S8. When the elapsed time reaches a predetermined time (YES, the process proceeds to S20).

In S20, the control board 68 extinguishes the burner 26.

In S22, the control board 68 stops the circulation fan 36.

In S24, the control board 68 stops the cooling fan 74.

In S26, the control board 68 notifies the user that the heating operation has been normally completed via the operation panel 66. After S26, the process of FIG. 4 ends.

In the cooking device 10 of the present embodiment, when a temperature exceeding the upper limit temperature is detected by the temperature sensor 78 during the heating operation, it is determined that an abnormality has occurred in the cooling fan 74, and the combustion gas is used. The heating of the object W to be heated is finished, and the user is notified of the abnormality. With such a configuration, it is possible to prevent the cooking device 10 from operating abnormally due to an excessively high temperature of the operation board 64 and the control board 68.

In the process of FIG. 4, when the temperature sensor 78 detects a temperature exceeding the upper limit temperature while the cooking cooker 10 is executing the heating operation, the heating power of the burner 26 is normally increased without extinguishing the burner 26. The heating operation may be continued in a state where the heating power is reduced to a predetermined limit heating power lower than the heating power. In this case, when the temperature detected by the temperature sensor 78 in S8 is equal to or lower than the upper limit temperature (NO), the control board 68 reduces the thermal power of the burner 26 to the limiting thermal power, and then passes through the operation panel 66. , Notifies the user that the thermal power of the burner 26 is limited due to the occurrence of an abnormality. After that, the process returns to S8.

If the exhaust duct 44 does not have a communication port 49 and the exhaust gas does not flow along the inclined plate 76 in the cooling passage 46, it is cooled when the cooking cooker 10 is performing the heating operation. Even when the fan 74 is not operating normally, the temperature rise detected by the temperature sensor 78 is gradual. Therefore, when the heating cooker 10 is performing the heating operation, the temperature detected by the temperature sensor 78 when the cooling fan 74 is operating normally, and the temperature detected by the cooling fan 74 when the cooling fan 74 is not operating normally. The difference in temperature detected by the temperature sensor 78 is small. Therefore, in the case of the above configuration, it is necessary to set the upper limit temperature used in the determination of S8 in FIG. 4 to a lower temperature (for example, 90 ° C.). However, the temperature detected by the temperature sensor 78 may rise to a certain temperature even if the cooling fan 74 does not have an abnormality. For example, when the heating cooker 10 ends the heating operation and the circulation fan 36 and the cooling fan 74 stop, the heat transfer from the heating chamber 14 becomes hot, and the entire inside of the cooking cooker 10 becomes hot, and the temperature sensor 78 also becomes hot. When the heating operation of the heating cooker 10 is started again from this state, the temperature sensor 78 detects the temperature exceeding the upper limit temperature in S8 of FIG. 4, and the cooling fan 74 is operating normally. Nevertheless, it is erroneously detected that an abnormality has occurred in the cooling fan 74.

On the other hand, when the exhaust duct 44 is provided with the communication port 49 and the exhaust gas flows along the inclined plate 76 in the cooling passage 46 as in the present embodiment, the heating cooker 10 is heated. If the cooling fan 74 is not operating normally at the time of performing the above, the temperature rise detected by the temperature sensor 78 becomes rapid. Therefore, when the heating cooker 10 is performing the heating operation, the temperature detected by the temperature sensor 78 when the cooling fan 74 is operating normally, and the temperature detected by the cooling fan 74 when the cooling fan 74 is not operating normally. The difference in temperature detected by the temperature sensor 78 becomes large. Therefore, even if the upper limit temperature used in the determination of S8 in FIG. 4 is set to a high temperature (for example, 200 ° C.), it is possible to determine the presence or absence of an abnormality in the cooling fan 74. Therefore, even if the temperature detected by the temperature sensor 78 rises to a certain temperature due to a cause other than the occurrence of the abnormality of the cooling fan 74, it is erroneously detected that the abnormality has occurred in the cooling fan 74. Can be prevented.

In the heating cooker 10 of this embodiment, the communication port 49 is provided on the downstream side of the flow path narrowing portion 47 of the exhaust duct 44. Therefore, the exhaust gas can be discharged from the communication port 49 due to the diffusion effect of the exhaust gas flowing downstream from the flow path throttle portion 47. A larger amount of exhaust gas can be discharged from the communication port 49 as compared with the case where the flow path narrowing portion 47 is not provided in the exhaust duct 44.

In the above embodiment, the temperature sensor 78 may be a thermoswitch that detects whether or not the detected temperature exceeds the upper limit temperature (for example, 200 ° C.), or the thermistor that outputs the detected temperature to the control board 68. And other types of temperature sensors. When the control board 68 can acquire the detected temperature of the temperature sensor 78, in S8 of FIG. 4, instead of comparing the temperature detected by the temperature sensor 78 with the upper limit temperature, for example, the control board 68 detects the temperature by the temperature sensor 78. The time change rate of the temperature is calculated, and when the calculated time change rate exceeds the predetermined value, the process proceeds to S10, and when the calculated time change rate is equal to or less than the predetermined value, the process of S18 is performed. You may move to.

In the above embodiment, the temperature sensor 78 may be covered with a cover (not shown). In this case, even if a liquid such as a spill enters the electrical component chamber 20 from the exhaust port 72, it is possible to prevent the liquid from coming into contact with the temperature sensor 78 and affecting the operation of the temperature sensor 78. ..

In the above embodiment, as shown in FIG. 5, a guide plate 59 may be provided inside the exhaust duct 44 to guide the exhaust gas flowing out from the flow path narrowing portion 47 toward the communication port 49. With such a configuration, more exhaust gas can be discharged from the communication port 49.

In the above embodiment, the temperature sensor 78 may be provided on the bottom plate 75 of the electrical component chamber 20 instead of the inclined plate 76 of the electrical component chamber 20. In this case, as shown in FIG. 6, instead of the flow path member 51, the flow path member 61 that guides the exhaust gas from the communication port 49 toward the bottom plate 75 at the location corresponding to the temperature sensor 78 is provided. The exhaust gas flowing out from the communication port 49 to the cooling passage 46 can flow along the bottom plate 75 below the temperature sensor 78, and the temperature sensor 78 can be heated by heat transfer from the exhaust gas.

In the above embodiment, the case where the cooling fan 74 is arranged on the upstream side of the temperature sensor 78 with respect to the air flow in the electrical component chamber 20 has been described, but the cooling fan 74 is in the electrical component chamber 20. It may be arranged at another place, for example, it may be arranged on the downstream side of the temperature sensor 78.

In the above embodiment, the configuration in which the upper end of the exhaust duct 44 is open in the cooling passage 46 has been described, but the upper end of the exhaust duct 44 may be communicated with the exhaust port 48. Also in this case, the air in the cooling passage 46 is also discharged to the outside through the exhaust port 48 by being pulled by the flow of the exhaust gas discharged from the exhaust duct 44 to the outside through the exhaust port 48, and the cooling passage 46 An air flow is generated inside.

In the above embodiment, the air supply port 50 of the cooling passage 46 is arranged to face the exhaust port 62 of the front door 24, and the configuration in which the air passing through the front door 24 flows into the cooling passage 46 has been described. .. Unlike this, the air supply port 50 of the cooling passage 46 may be exposed on the front surface of the housing 12, and the outside air may directly flow into the air supply port 50.

As described above, in one or more embodiments, the heating cooker 10 includes a burner 26, a heating chamber 14 accommodating the object to be heated W, and a circulation fan 36 for sending combustion gas from the burner 26 to the heating chamber 14. (Example of a blower), an exhaust duct 44 through which exhaust gas from the heating chamber 14 flows, and an air supply port 56, which extends along the upper surface of the heating chamber 14 and surrounds the exhaust duct 44. Cooling passage 46 (example of first air passage) through which air flowing in from the outside through 58 (example of first air supply port) and flowing out to the outside through exhaust port 48 (example of first exhaust port) ) And extends along the upper surface of the cooling passage 46, flows in from the outside through the air supply port 70 (example of the second air supply port), and flows through the exhaust port 72 (example of the second exhaust port). An electrical component room 20 (example of a second air passage) through which air flowing out to the outside passes, an operation board 64, a control board 68 (example of a circuit board) arranged in the electrical component room 20, and an electrical component room 20. It includes a cooling fan 74 (an example of a cooling device) arranged inside, and a temperature sensor 78 arranged inside the electrical component room 20. The exhaust duct 44 has a communication port 49 that communicates with the cooling passage 46. The temperature sensor 78 is arranged so as to face a portion where the exhaust gas flowing from the exhaust duct 44 to the cooling passage 46 through the communication port 49 flows. The cooking cooker 10 limits the thermal power of the burner 26 when the temperature detected by the temperature sensor 78 satisfies a predetermined condition.

According to the above configuration, while the heating cooker 10 is executing the heating operation, the temperature sensor 78 is cooled by the cooling fan 74 arranged in the electrical component chamber 20, and the communication port 49 is provided from the exhaust duct 44. It is heated by heat transfer from the exhaust gas flowing into the cooling passage 46 through the cooling passage 46. Therefore, if an abnormality occurs in the cooling fan 74 while the cooking cooker 10 is executing the heating operation, the temperature detected by the temperature sensor 78 rises sharply. With such a configuration, when an abnormality occurs in the cooling fan 74, the temperature sensor 78 can promptly detect the occurrence of the abnormality in the cooling fan 74 and limit the thermal power of the burner 26. Further, according to the above configuration, when the heating cooker 10 is not executing the heating operation, the temperature sensor 78 is not heated by the heat transfer from the exhaust gas. Therefore, for example, the residual heat of the heating chamber 14 causes the temperature sensor 78 to be heated. Even when the temperature of the temperature sensor 78 rises, the detection temperature of the temperature sensor 78 does not become so high. With such a configuration, even if the temperature detected by the temperature sensor 78 rises due to a cause other than the occurrence of the abnormality of the cooling fan 74, it is erroneously detected that the abnormality has occurred in the cooling fan 74. Can be prevented.

In one or more embodiments, the exhaust duct 44 has a flow path throttle portion 47 having a flow path area smaller than that on the downstream side. The communication port 49 is arranged on the downstream side of the flow path narrowing portion 47.

According to the above configuration, more exhaust gas can flow out from the exhaust duct 44 to the cooling passage 46 through the communication port 49 due to the diffusion effect of the exhaust gas flowing downstream from the flow path throttle portion 47. .. When an abnormality occurs in the cooling fan 74, the temperature rise detected by the temperature sensor 78 can be made more rapid, and the occurrence of an abnormality in the cooling fan 74 can be quickly detected.

In one or more embodiments, the cooker 10 is disposed inside the exhaust duct 44 and further comprises a guide plate 59 (example of a guide member) that guides the exhaust gas towards the communication port 49. There is.

According to the above configuration, more exhaust gas can be discharged from the exhaust duct 44 to the cooling passage 46 through the communication port 49. When an abnormality occurs in the cooling fan 74, the temperature rise detected by the temperature sensor 78 can be made more rapid, and the occurrence of an abnormality in the cooling fan 74 can be quickly detected.

In one or more embodiments, the cooking cooker 10 is arranged in the cooling passage 46, and exhaust gas flowing from the exhaust duct 44 into the cooling passage 46 through the communication port 49 reaches the air supply ports 56, 58. A lower guide plate 53 (an example of a backflow prevention member) for preventing the flow toward the air is further provided.

According to the above configuration, it is possible to prevent the exhaust gas that has flowed from the exhaust duct 44 into the cooling passage 46 through the communication port 49 from flowing back through the cooling passage 46 and flowing out from the air supply ports 56 and 58. Can be done.

In one or more embodiments, the temperature sensor 78 is arranged at a position facing the communication port 49 across the cooling passage 46.

According to the above configuration, the temperature sensor 78 can be easily heated by heat transfer from the exhaust gas. When an abnormality occurs in the cooling fan 74, the temperature rise detected by the temperature sensor 78 can be made more rapid, and the occurrence of an abnormality in the cooling fan 74 can be quickly detected.

In one or more embodiments, the temperature sensor 78 is located on an inclined plate 76 that is tilted with respect to the horizontal.

According to the above configuration, even if a liquid such as a spill enters the electrical component chamber 20, the liquid does not stay in the inclined plate 76, so that the liquid that has entered the electrical component chamber 20 is the temperature sensor 78. It is possible to suppress the influence on the temperature detection by.

Although the examples have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples exemplified above. The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in the present specification or the drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

10: Heating cooker 12: Housing 14: Heating cabinet 16: Burner room 18: Circulation fan room 20: Electrical equipment room 21: Fan motor room 22: Tray 23: Air supply port 24: Front door 25: Cooling duct 26: Burner 28: Air supply port 30: Combustion gas passage 32: Filter 34: Opening 36: Circulation fan 38: Fan motor 40: Circulation passage 42: Exhaust passage 44: Exhaust duct 45: Wall member 46: Cooling passage 47: Flow path throttle Part 48: Exhaust port 49: Communication port 50: Air supply port 51: Flow path member 52: Inner cooling passage 53: Lower guide plate 54: Outer cooling passage 55: Right guide plate 56: Air supply port 57: Left guide plate 58: Air supply port 59: Guide plate 60: Opening 61: Flow path member 62: Exhaust port 64: Operation board 66: Operation panel 68: Control board 70: Air supply port 72: Exhaust port 74: Cooling fan 75: Bottom plate 76 : Inclined plate 78: Temperature sensor

Claims (6)

With a burner
A heating cabinet that houses the object to be heated,
A blower that sends combustion gas from the burner to the heater,
The exhaust duct through which the exhaust gas from the heating chamber flows, and
It extends along the upper surface of the heating chamber and surrounds the exhaust duct, and air that flows in from the outside through the first air supply port and flows out to the outside through the first exhaust port passes through. The first air passage to be
A second air passage extending along the upper surface of the first air passage, through which air flowing in from the outside through the second air supply port and flowing out to the outside through the second exhaust port, and a second air passage.
The circuit board arranged in the second air passage and
The cooling device arranged in the second air passage and
It is equipped with a temperature sensor arranged in the second air passage.
The exhaust duct has a communication port that communicates with the first air passage.
The temperature sensor is arranged so as to face a position where the exhaust gas flowing from the exhaust duct to the first air passage through the communication port flows.
A cooking device that limits the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition. The exhaust duct has a flow path narrowing portion having a flow path area narrower than that on the downstream side.
The cooking device according to claim 1, wherein the communication port is arranged on the downstream side of the flow path throttle portion. The cooker according to claim 1 or 2, further comprising a guide member arranged inside the exhaust duct and guiding the exhaust gas toward the communication port. Backflow prevention that is arranged in the first air passage and prevents the exhaust gas that flows from the exhaust duct into the first air passage through the communication port from flowing toward the first air supply port. The heating cooker according to any one of claims 1 to 3, further comprising a member. The cooker according to any one of claims 1 to 4, wherein the temperature sensor is arranged at a position facing the communication port across the first air passage. The cooker according to claim 5, wherein the temperature sensor is arranged on an inclined plate inclined with respect to the horizontal.

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