JP7213112B2 - heating cooker - Google Patents

Description

The technology disclosed in this specification relates to a heating cooker.

Patent Literature 1 discloses a heating cooker. The heating cooker includes a burner, a heating chamber for heating an object to be heated by combustion gas from the burner, an exhaust duct for discharging exhaust gas from the heating chamber to the outside, and along the upper surface of the heating chamber a first air passage extending and surrounding the exhaust duct, through which air flows in from the outside through the first air supply port and flows out to the outside through the first air outlet; a second air passage extending along the upper surface of the first air passage, through which air flows in from the outside through the second air supply port and flows out to the outside through the second air outlet; A circuit board is arranged in the air passage, a cooling fan is arranged in the second air passage, and a temperature sensor is arranged in the second air passage. The heating cooker reduces the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition.

Japanese Patent Application Laid-Open No. 2019-20014

In the above-described heating cooker, even if some abnormality occurs in the heating cooker and the temperature of the second air passage rises, the detected temperature of the temperature sensor rises relatively slowly, so the occurrence of abnormality It takes some time to detect The present specification provides a technology capable of quickly reducing the heating power of a burner when an abnormality occurs in a heating cooker.

The heating cooker disclosed in the present specification includes a burner, a heating chamber for heating an object to be heated by combustion gas from the burner, an exhaust duct for discharging exhaust gas from the heating chamber to the outside, and the heating chamber. and surrounds the exhaust duct, through which the 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 an air passage, and a second air passage extending along the upper surface of the first air passage, through which air flows in from the outside through the second air supply port and flows out through the second air outlet. a circuit board arranged in the second air passage; a cooling fan arranged in the second air passage; There may be temperature sensors arranged at opposing positions. The heating cooker reduces the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition. It should be noted that the reduction in the thermal power of the bar referred to here may be to reduce the thermal power of the burner to continue combustion, or to extinguish the burner and prohibit the combustion of the burner. .

When some abnormality occurs in the heating cooker and the temperature of the second air passage rises, the portion of the second air passage facing the exhaust duct across the first air passage is , the temperature rises rapidly. According to the above configuration, the temperature sensor used for detecting abnormality is arranged in the second air passage at a position facing the exhaust duct with the first air passage interposed therebetween. With such a configuration, the heating power of the burner can be quickly reduced when an abnormality occurs in the heating cooker.

In the cooking device, the temperature sensor may be arranged on an inclined surface that is inclined with respect to a horizontal surface.

According to the above configuration, even if liquid, such as boiled over, enters the second air passage, the liquid does not stay on the inclined surface. Does not affect detection.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the schematic of the heating cooker 10 of an Example. 4 is a flow chart showing processing performed by the control board 68 of the heating cooker 10 of the embodiment. 7 is a graph for explaining the relationship between the arrangement of the temperature sensor 78 and the temperature detected by the temperature sensor 78;

(Example)
A heating cooker 10 of this embodiment shown in FIG. 1 is a convection oven for commercial use. The heating cooker 10 includes a housing 12 , a heating chamber 14 , a burner chamber 16 , a circulation fan chamber 18 and an electrical component chamber 20 . The heating chamber 14 , burner chamber 16 , circulation fan chamber 18 , and electrical equipment chamber 20 are housed inside the housing 12 .

The heating chamber 14 has a plurality of trays 22 arranged vertically. An object to be heated W such as a food material or a cooking vessel can be placed on each tray 22 . The user can put the object W to be heated in and out of the heating chamber 14 while the front door 24 is 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 . A burner 26 for burning fuel gas is provided in the burner chamber 16 . 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 control valve (not shown). The burner 26 is ignited when an igniter (not shown) ignites while the gas on-off valve of the gas supply pipe is open. The heating power of the burner 26 can be adjusted by adjusting the opening degree of the gas flow control valve of the gas supply pipe during combustion of the burner 26 . When the gas on-off valve of the gas supply pipe is closed while the burner 26 is burning, the burner 26 is extinguished. The front end of the burner chamber 16 is provided with an air supply port 28 through which air flows in from the outside. 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 vertically 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 through an opening 34 .

A circulation fan 36 is arranged in the circulation fan chamber 18 . The circulation fan 36 is rotationally driven by a fan motor 38 . A 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 inside the heating chamber 14 .

A front end of an exhaust passage 42 communicates with the uppermost portion of the heating chamber 14 . A rear end of the exhaust passage 42 communicates with a lower end of the exhaust duct 44 . The exhaust duct 44 extends vertically. The upper end of the exhaust duct 44 opens within the cooling passage 46 . The upper end of the cooling passage 46 communicates with an exhaust port 48 formed on the upper surface of the housing 12 .

In the heating cooker 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 through the combustion gas passage 30 into the circulation fan chamber 18 and circulates. It is sent out to the lowest part in the heating chamber 14 via the passage 40 . The combustion gas that has flowed into the heating chamber 14 flows around the object W to be heated placed on the tray 22 to heat the object W to be heated. 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, passes through the circulation fan chamber 18 and the circulation passage 40 again, and flows into the heating chamber 14. is sent to the bottom of the 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 . 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 . An air supply port 50 is formed at the front end of the cooling passage 46 .

The front door 24 has an inner cooling passage 52 and an outer cooling passage 54 . The inner cooling passage 52 is formed in a shape that covers the front surface of the heating chamber 14 . The outer cooling passage 54 is shaped to cover the front surface of the inner cooling passage 52 . An air supply port 56 is formed at the lower end of the inner cooling passage 52 to allow air to flow in from the outside. The lower end of the outer cooling passage 54 is formed with an air supply port 58 through which air flows in from the outside. An upper end of the inner cooling passage 52 communicates with the outer cooling passage 54 through an opening 60 . An exhaust port 62 is formed in the uppermost rear surface 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 with the combustion gas, the air in the cooling passage 46 is pulled by the flow of the exhaust gas discharged from the exhaust duct 44 to the exhaust port 48. is also discharged to the exhaust port 48. Due to this air flow, air flows into each of the air supply openings 56 and 58 of the front door 24 . The air that has flowed into the air supply port 56 flows upward through the inner cooling passage 52 and then flows into the outer cooling passage 54 via the opening 60 . The air that has flowed into the air supply port 58 flows upward through the outer cooling passage 54 . The flow of air through the inner cooling passage 52 and the outer cooling passage 54 can 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 via the air supply port 50 . The air that has flowed into the cooling passage 46 flows from the front to the rear along the upper surface of the heating chamber 14 and is then discharged from the exhaust port 48 .

The electrical component room 20 is arranged above the heating chamber 14 and forward of the exhaust duct 44 . A cooling passage 46 is interposed between the electrical component room 20 and the heating chamber 14 . 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 room 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 section (not shown) that displays the state of the cooking device 10 to the user, and an operation section (not shown) that accepts operation input to the cooking device 10 from the user. The operation board 64 is a circuit board that controls the operation of the display section of the operation panel 66 and detects an operation input from the user to the operation section of the operation panel 66 . A control board 68 is arranged behind the operation board 64 in the electrical component 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 electrical component of the heating cooker 10 .

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

A front end of the electrical component room 20 communicates with an air supply port 70 formed on the front surface of the housing 12 . A 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 in 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 into the electrical component room 20 from the outside of the housing 12 through the air supply port 70, and air flows from the electrical component room 20 to the outside of the housing 12 through the exhaust port 72. leak. The operation board 64 and the control board 68 arranged inside the electrical component room 20 are cooled by the air flow in the electrical component room 20 . An inclined surface 76 that is inclined with respect to the horizontal surface is provided at the lower portion of the rear end of the electrical component chamber 20 . A temperature sensor 78 is provided on the inclined surface 76 . The temperature sensor 78 is arranged at a position facing the exhaust duct 44 with the cooling passage 46 interposed therebetween.

The operation of the heating cooker 10 will be described below 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 processing shown in FIG.

At S<b>2 , the control board 68 drives the cooling fan 74 .

At S<b>4 , the control board 68 drives the circulation fan 36 .

In S6, the control board 68 ignites the burner 26. Thereby, the 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 (90° C., for example). If the temperature detected by the temperature sensor 78 exceeds the upper limit temperature (if YES), the control board 68 determines that the cooling fan 74 is abnormal, and the process proceeds to S10.

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

At S<b>12 , the control board 68 stops the circulation fan 36 .

At S<b>14 , the control board 68 stops the cooling fan 74 .

In S16, the control board 68 notifies the user via the operation panel 66 that the heating operation has ended abnormally. After S16, the process of FIG. 2 ends.

In S8, if 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 a predetermined time (for example, 30 minutes) has elapsed since the burner 26 was ignited in S6. The predetermined time is a time set in advance as the time required for the heating operation of the heating cooker 10 . If the elapsed time has not reached the predetermined time (NO), the process returns to S8. When the elapsed time reaches the predetermined time (YES), the process proceeds to S20.

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

At S<b>22 , the control board 68 stops the circulation fan 36 .

At S<b>24 , the control board 68 stops the cooling fan 74 .

In S26, the control board 68 notifies the user via the operation panel 66 that the heating operation has been normally completed. After S26, the process of FIG. 2 ends.

In the heating cooker 10 of the present embodiment, when the temperature sensor 78 detects a temperature exceeding the upper limit temperature during the heating operation, it is determined that the cooling fan 74 is abnormal, and the combustion gas The heating of the object to be heated W is ended, and the user is notified of the abnormality. With such a configuration, it is possible to prevent the operation board 64 and the control board 68 from becoming excessively hot and causing the heating cooker 10 to operate abnormally.

In the process of FIG. 2, when the temperature sensor 78 detects a temperature exceeding the upper limit temperature while the heating cooker 10 is performing the heating operation, the burner 26 is not extinguished, and the heating power of the burner 26 is reduced to normal. A configuration may be adopted in which the heating operation is continued while the thermal power is reduced to a predetermined limit thermal power lower than the thermal power. In this case, if the temperature detected by the temperature sensor 78 in S8 is equal to or lower than the upper limit temperature (in the case of NO), the control board 68 reduces the thermal power of the burner 26 to the limit thermal power, and , to inform the user that the heating power of the burner 26 is being limited due to the occurrence of an abnormality. After that, the process returns to S8.

FIG. 3 shows the relationship between the arrangement of the temperature sensor 78 and the temperature detected by the temperature sensor 78 when the cooling fan 74 malfunctions. A curve L1 in FIG. 3 shows the change over time in the temperature detected by the temperature sensor 78 when the temperature sensor 78 is placed at the position shown in FIG. ing. As a comparative example, the curve L2 in FIG. shows the change over time of the temperature detected by the temperature sensor 78 when it is arranged at a position facing the heating chamber 14 . As is clear from FIG. 3, when the temperature sensor 78 is arranged at a position facing the exhaust duct 44 across the cooling passage 46, the temperature detected by the temperature sensor 78 rises sharply when an abnormality occurs in the cooling fan 74. do. Therefore, according to the heating cooker 10 of the present embodiment, the temperature detected by the temperature sensor 78 can be used to quickly detect the occurrence of an abnormality.

In the above embodiment, the temperature sensor 78 may be a thermoswitch that detects whether the detected temperature exceeds the upper limit temperature (for example, 90° C.), or a thermistor that outputs the detected temperature to the control board 68. or other types of temperature sensors. If the control board 68 can acquire the temperature detected by the temperature sensor 78, instead of comparing the temperature detected by the temperature sensor 78 with the upper limit temperature in S8 of FIG. If the calculated time rate of change exceeds a predetermined value, the process proceeds to S10, and if the calculated time rate of change is equal to or less than the predetermined value, the process of S18 is performed. You can move to

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

In the above embodiment, the heat cooker 10 is a convection oven with the circulation fan 36, but the heat cooker 10 may be a deck oven without the circulation fan 36.

Although the upper end of the exhaust duct 44 is open in the cooling passage 46 in the above embodiment, the upper end of the exhaust duct 44 may be communicated with the exhaust port 48 . In this case also, the air in the cooling passage 46 is pulled by the flow of the exhaust gas discharged to the outside through the exhaust port 48 from the exhaust duct 44, and the air inside the cooling passage 46 is also discharged to the outside through the exhaust port 48. An air flow is created 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 air passing through the front door 24 flows into the cooling passage 46. . Alternatively, the air supply port 50 of the cooling passage 46 may be exposed to the front surface of the housing 12 so that external air directly flows into the air supply port 50 .

As described above, the heating cooker 10 according to the present embodiment includes the burner 26, the heating chamber 14 that heats the object W to be heated by the combustion gas from the burner 26, and discharges the exhaust gas from the heating chamber 14 to the outside. , and air supply ports 56 and 58 (or air supply port 50) extending along the upper surface of the heating chamber 14 and surrounding the exhaust duct 44 (an example of the first air supply port ) from the outside and flows out to the outside through an exhaust port 48 (an example of a first exhaust port) passes through the inner cooling passage 52, the outer cooling passage 54, and the cooling passage 46 (or the cooling passage 46). (an example of a first air passage) and the upper surface of the cooling passage 46, and flows in from the outside through an air supply port 70 (an example of a second air supply port) to an exhaust port 72 (second exhaust port). The electrical component chamber 20 (example of the second air passage) through which the air flowing out to the outside passes through, and the operation board 64 and the control board 68 (example of the circuit board) arranged in the electrical component room 20 ), a cooling fan 74 arranged in the electrical component room 20 , and a temperature sensor 78 arranged in the electrical component room 20 at a position facing the exhaust duct 44 with the cooling passage 46 interposed therebetween. Heating cooker 10 reduces the heating power of burner 26 when the temperature detected by temperature sensor 78 satisfies a predetermined condition.

When some abnormality occurs in the heating cooker 10 and the temperature of the electrical component room 20 rises, the part of the electrical component room 20 facing the exhaust duct 44 across the cooling passage 46 is replaced with another part. In comparison, the temperature rises rapidly. According to the above configuration, the temperature sensor 78 used for abnormality detection is arranged in the electrical component room 20 at a position facing the exhaust duct 44 with the cooling passage 46 interposed therebetween. By adopting such a configuration, the heating power of the burner 26 can be quickly reduced when an abnormality occurs in the heating cooker 10 .

In the heating cooker 10 of this embodiment, the temperature sensor 78 is arranged on the inclined surface 76 inclined with respect to the horizontal surface.

According to the above configuration, even if liquid such as boiled over spilled liquid enters the electrical component chamber 20 from the exhaust port 72, the liquid will not stay on the inclined surface 76, so the liquid that has entered the electrical component chamber 20 will not remain. does not affect the temperature detection by the temperature sensor 78.

Although the embodiments have been described in detail above, these are only examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or in the drawings exhibit technical utility either singly or in various combinations, and are not limited to the combinations described in the claims as filed. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

10: Cooking device 12: Case 14: Heating chamber 16: Burner chamber 18: Circulation fan chamber 20: Electrical equipment chamber 22: Tray 24: Front door 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 46: cooling passage 48: exhaust port 50: air supply port 52: inner cooling passage 54: outer cooling passage 56: air supply Port 58 : Air supply port 60 : Opening 62 : Air outlet 64 : Operation board 66 : Operation panel 68 : Control board 70 : Air supply port 72 : Air outlet 74 : Cooling fan 76 : Inclined surface 78 : Temperature sensor

Claims (2)

burner and
a heating chamber for heating an object to be heated by combustion gas from the burner;
an exhaust duct through which the exhaust gas from the heating chamber flows;
It extends along the upper surface of the heating chamber and surrounds the exhaust duct, and the 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 first air passage to
a second air passage extending along the upper surface of the first air passage, through which air flows from the outside through the second air supply port and flows out to the outside through the second exhaust port;
a circuit board disposed within the second air passage;
a cooling fan disposed in the second air passage;
a temperature sensor disposed in the second air passage at a position facing the exhaust duct across the first air passage;
A heating cooker that reduces the heating power of the burner when the temperature detected by the temperature sensor satisfies a predetermined condition. 2. The heating cooker according to claim 1, wherein said temperature sensor is arranged on an inclined plane with respect to a horizontal plane.

Images