JP2016145689A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a determination method which achieves improvement of detection accuracy for abnormal combustion of a burner, in a heating cooker which performs heating cooking of an object to be heated by delivering hot air exhausted from the burner into a heating chamber.SOLUTION: A heating cooker includes: a heating chamber 10 for accommodating an object to be heated; a burner 13 for generating hot air by discharging gas from a plurality of flame holes 130 juxtaposed in the same direction and burning it; a combustion chamber 20 in which the burner 13 is disposed; and a circulation fan 14 for leading out the hot air from the inside of the combustion chamber 20 and for delivering it to the heating chamber 10. By the circulation fan 14, the air of the body outside is taken in the combustion chamber 20 from an air supply port 112, and it is guided to the periphery of each flame hole 130 of the burner 13. In a hot air lead-out path 200 in the combustion chamber 20, two temperature sensors 171, 172 are provided being separated in the juxtaposition direction of the flame holes 130. When a state in which mutual detection temperature difference of the temperature sensors 171, 172 is larger than a reference value continues for predetermined time or longer, it is determined that the burner 13 is in an abnormal combustion state.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heating cooker, and more particularly to a heating cooker that feeds hot air released from a burner into a heating chamber to cook an object to be heated.

  Conventionally, so-called hot air is used to cook an object to be heated, such as food, by placing a burner in the space below the heating chamber provided inside the main body and sending hot air released from the burner into the heating chamber by a circulation fan. Circulating heating cookers are known. In this type of cooking device, the structure around the heating chamber is reduced in size so as to make the volume of the heating chamber as large as possible in a limited space inside the main body. Specifically, a combustion chamber is provided in a relatively narrow gap between the opposed bottom walls of the heating chamber and the main body case, and a burner having a plurality of flame holes arranged in parallel in the same direction is arranged in the combustion chamber. And what was comprised so that the hot air discharge | released from the burner might be sent into a heating chamber from a combustion chamber by a circulation fan is proposed (for example, refer patent document 1).

JP2013-213649A

  The conventional cooking device is configured to take in the secondary air for burning the burner from the outside of the main body into the combustion chamber through the air supply port provided on the front surface of the main body case, and guide it to the periphery of each flame hole of the burner. Therefore, if the air supply port is blocked by dust or the like and the flow of external air around the flame hole becomes poor, abnormal combustion of the burner such as incomplete combustion or a lift phenomenon of the combustion flame may occur. Therefore, in order to detect such abnormal combustion, if a temperature sensor is disposed at a predetermined position in the hot air derivation path in the combustion chamber and the temperature detected by the temperature sensor becomes higher than the reference temperature during normal combustion, the burner is in an abnormal combustion state. A method for determining that the

  However, when a part of the air supply port is blocked, the flow of external air to a partial region in the combustion chamber is deteriorated, and the air flow is biased between one side and the other side in the direction in which the flame holes are arranged side by side. Arise. Therefore, even if it is configured to determine the abnormal combustion of the burner based on the temperature at a specific position in the hot air derivation path as described above, there is a possibility that the abnormal combustion cannot be accurately detected.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a hot cooker that feeds hot air released from a burner into a heating chamber and cooks an object to be heated. The purpose is to improve detection accuracy.

  The present invention includes a heating chamber that accommodates an object to be heated, a burner that emits gas from a plurality of flame holes arranged in parallel in the same direction, generates hot air, a combustion chamber in which a burner is disposed, It has a circulation fan that guides hot air from the combustion chamber and sends it into the heating chamber. The circulation fan takes air outside the main body into the combustion chamber from the air supply port, and guides it around each flame hole of the burner. In the cooking device, two temperature sensors are provided in the hot air lead-out path in the combustion chamber so as to be spaced apart from each other in the direction in which the flame holes are arranged side by side. When it continues as described above, the burner is determined to be in an abnormal combustion state.

  When the external air is uniformly taken into the entire combustion chamber from the air supply port, the flow of the external air to the hot air derivation path hardly causes a difference between one side and the other side in the direction in which the flame holes are arranged side by side. Therefore, the external air flows evenly around the arrangement portions of the two temperature sensors. However, if the degree of blockage of the air supply port increases and the flow of external air to a part of the combustion chamber becomes poor, the flow of air to one of the temperature sensors is also less than normal. A temperature deviation occurs between the ambient temperature and the temperature of the other temperature sensor. Therefore, in the present invention, if the detected temperature difference between the two temperature sensors is larger than the reference value for a predetermined time or longer, it is determined that the burner is in an abnormal combustion state. This makes it possible to accurately detect abnormal combustion of the burner even if the air supply port closing conditions are different.

  Further, in the cooking device according to the present invention, when the number of abnormality determinations determined to be in the abnormal combustion state is less than a predetermined number, the burner abnormal combustion is permitted from the notification unit while allowing the cooking operation. When the number of times of abnormality determination is equal to or greater than a predetermined number, the cooking operation is prohibited and abnormal combustion of the burner is notified from the notification means.

  Even when the air supply port is blocked, such as when the air supply port is blocked by the body or clothes, the blockage is easily resolved and the original normal state may be restored. Therefore, in the present invention, even if it is determined that the burner is in an abnormal combustion state, while the number of times of abnormality determination is less than a predetermined number, the cooking operation is not prohibited and abnormal combustion has occurred in the burner. Information only. Thereby, even though the cause of abnormal combustion can be easily solved, there is no problem that the use is immediately restricted.

  On the other hand, if the number of abnormal determinations is greater than or equal to the predetermined number, the cause of abnormal combustion may be due to the fact that the user cannot deal with it, such as clogged flames or malfunctioning gas valves. Performs a notification that abnormal combustion has occurred in the burner after prohibiting the cooking operation. Thereby, the problem that it can continue to be used in a state where there is a malfunction in the device does not occur.

  Further, in the heating cooker according to the present invention, when it is determined that the burner is in an abnormal combustion state and the detected temperature difference is greater than a reference value and less than a predetermined time, the burner is in a normal combustion state. Therefore, the record of the number of times of abnormality determination is erased.

  In this case, even if it is determined that the burner is in an abnormal combustion state, the cause of abnormal combustion is eliminated, and if the state where the detected temperature difference is large does not continue for a predetermined time or longer, the record of the number of times of abnormality determination is deleted. Despite the fact that the cause of abnormal combustion can be easily eliminated, there is no problem of sudden use being restricted during long-term use.

  Moreover, this invention is set as the structure which determines that a burner is an abnormal combustion state, when the detection temperature of at least any one temperature sensor reaches the predetermined | prescribed upper limit in the said heating cooker.

  If burner abnormal combustion occurs due to an increase in the gas pressure supplied to the burner, a decrease in the amount of primary air, or exhaust failure from the combustion chamber, the formation position, orientation, and range of the combustion flame become unstable, and the temperature sensor There may be a high temperature around the arrangement part. Therefore, in the present invention, even if the detected temperature difference between the two temperature sensors is equal to or less than the reference value, if any one of the detected temperatures reaches a predetermined upper limit value, it is determined that the burner is in an abnormal combustion state. Thereby, the abnormal combustion of the burner can be detected more reliably.

  As described above, according to the present invention, it is possible to provide a cooking device with high detection accuracy that can accurately detect abnormal combustion of a burner even if the air supply port closing conditions are different.

FIG. 1 is a schematic perspective longitudinal sectional view of a cooking device according to an embodiment of the present invention. FIG. 2 is a schematic perspective view around the combustion chamber of the heating cooker according to the embodiment of the present invention. FIG. 3 is a schematic top cross-sectional view of the vicinity of the combustion chamber of the cooking device according to the embodiment of the present invention. FIG. 4 is a schematic rear view longitudinal sectional view around the combustion chamber of the cooking device according to the embodiment of the present invention. FIG. 5 is a schematic configuration diagram of the cooking device according to the embodiment of the present invention. FIG. 6 is an operation flowchart showing an abnormal combustion determination operation of the cooking device according to the embodiment of the present invention.

Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the heating cooker 1 according to the embodiment of the present invention is a gas stove having an oven function, and a heating chamber 10 that houses an object to be heated such as food in a main body case 11. Is provided. Further, the front door 111 of the main body case 11 is provided with a front door 12 that closes the front opening 100 of the heating chamber 10. Further, a plurality of air supply ports 112 for taking in air outside the main body into the combustion chamber 20 are provided at a position behind the front door 12 and near the lower end of the front surface portion 111 of the main body case 11. In addition, in this specification, the front part 111 of the main body case 11 is made into the front of the heating cooker 1, the depth direction of the main body case 11 when the heating cooker 1 is seen from the front side is the front-back direction, and the width direction is the left-right direction. The height direction is called the vertical direction.

  A combustion chamber 20 for accommodating the burner 13 is provided in the space below the heating chamber 10 in the main body case 11, that is, in the gap between the opposing bottom walls of the heating chamber 10 and the main body case 11. Further, in the space behind the heating chamber 10 in the main body case 11, a hot air passage 30 that guides the combustion heat (hot air) of the gas released from the burner 13 into the combustion chamber 20 to the suction port 141 of the circulation fan 14 is provided. It has been. Further, an exhaust passage 31 that guides the air in the heating chamber 10 to the outside of the main body case 11 is provided in the upper rear portion of the heating chamber 10 in the main body case 11.

  The heating chamber 10 comprises a top wall 10A constituting the upper surface, a bottom wall 10B constituting the bottom surface, a left side wall 10C constituting the left side, a right side wall (not shown) constituting the right side, and a rear side. The inner wall 10E is formed in a substantially rectangular box shape that opens forward.

  An exhaust port 101 connected to the exhaust passage 31 is opened at a position closer to the rear side of the upper wall 10A of the heating chamber 10, and oil smoke and odor components generated from the heated object pass through the exhaust passage 31 from the exhaust port 101. To the outside of the main body case 11.

  A hot air outlet hole 102 connected to a blower outlet (not shown) of the circulation fan 14 is formed at a position closer to the left and right sides than the center of the back wall 10E of the heating chamber 10. Further, a hot air introduction hole 103 connected to the hot air passage 30 is opened at the center position of the back wall 10E of the heating chamber 10. Therefore, when the circulation fan 14 is operated, hot air discharged from the burner 13 into the combustion chamber 20 is sucked into the suction port 141 through the hot air passage 30 and then sent into the heating chamber 10 from the hot air outlet hole 102. . Further, a part of the hot air sent into the heating chamber 10 is sucked into the suction port 141 through the hot air passage 30 from the hot air introduction hole 103 and is sent again into the heating chamber 10 from the hot air outlet hole 102.

  As shown in FIG. 2, the combustion chamber 20 includes an upper wall 20A that constitutes an upper surface, a bottom wall 20B that constitutes a bottom surface, a left wall 20C that constitutes a left side surface, and a right wall 20D that constitutes a right side surface, The rear wall 20 </ b> E constituting the rear surface is formed in a substantially rectangular box shape that opens forward, and the burner 13 is incorporated in the combustion chamber 20 at a substantially central position in the front-rear direction. The air supply port 112 is provided in front of the front opening 21 of the combustion chamber 20, and the circulation fan 14 is operated so that air outside the main body (external air) is secondary for combustion of the burner 13. The air is taken into the combustion chamber 20 from the air supply port 112.

  A communication port 22 that connects the combustion chamber 20 and the hot air passage 30 is provided at a position near the center rear side of the upper wall 20A of the combustion chamber 20, and the hot air discharged from the burner 13 into the combustion chamber 20 is communicated with the communication chamber. It is guided to the hot air passage 30 through the mouth 22.

  The burner 13 is a tubular body formed by bending a pressed plate material, and as shown in FIG. 1, there is a predetermined gap between the upper wall 20A and the bottom wall 20B of the combustion chamber 20. Arranged. Accordingly, the external air taken into the combustion chamber 20 from the air supply port 112 passes through the upper and lower gaps of the burner 13 and is guided to the periphery of the flame hole 130 formed in the rear end surface of the burner 13.

  As shown in FIGS. 2 and 3, the burner 13 is formed in a substantially rectangular shape when viewed from the left and right, and a plurality of flame holes 130 are arranged in parallel at a predetermined interval in the left-right direction on the rear end surface. It is installed. A gas supply port 131 is provided at one side end (here, the right end) of the burner 13. Although not shown, a gas ejection nozzle is provided opposite to the gas supply port 131, and the gas ejected from the gas ejection nozzle together with the air around the gas supply port 131 is inside the burner 13. And is ejected in a planar shape from each flame hole 130 toward the rear.

  A laterally long plate-like rectifying plate 132 is provided on the upper surface and the lower surface of the burner 13 with a gap of a certain width from the upper wall 20A or the bottom wall 20B of the combustion chamber 20 facing each other. Accordingly, the external air taken into the combustion chamber 20 from the air supply port 112 is supplied to the periphery of the flame hole 130 at a constant flow rate between the left and right sides of the burner 13 when passing through the upper and lower gaps of the burner 13. Therefore, if the burner 13 is ignited, a stable combustion flame is formed behind the flame hole 130.

  A flame detection sensor 15 that detects the presence or absence of a combustion flame behind the flame hole 130 is provided at a position behind the burner 13 on the left side wall 20C of the combustion chamber 20 and in the vicinity of the flame hole 130. On the other hand, an ignition plug 16 for spark discharge around the flame hole 130 is provided behind the burner 13 on the right side wall 20D of the combustion chamber 20 and in the vicinity of the flame hole 130. When an ignition operation is performed and a predetermined voltage is applied from an igniter (not shown), a spark discharge is generated around the specific flame hole 130 to ignite the gas emitted from the flame hole 130.

  Further, the burner 13 is located behind the burner 13 on the left side wall 20C and behind the flame detection sensor 15, and behind the burner 13 on the right side wall 20D and behind the spark plug 16. Temperature sensors 171 and 172 for detecting 13 combustion states are provided separately. That is, the two temperature sensors 171 and 172 are spaced apart in the same direction as the juxtaposed direction (left and right direction) of the flame holes 130 at a substantially intermediate position of the hot air derivation path 200 from the formation part of the flame holes 130 to the communication port 22. Is provided.

  Inside the side walls 20C and 20D and at a position behind the flame detection sensor 15 and the spark plug 16 arrangement portion, an air guide plate 23 for guiding the hot air released from the burner 13 to the communication port 22 is provided on the side walls 20C and 20D. The temperature sensor 171, 172 is disposed at the front end of the air guide plate 23, extending from 20 </ b> D toward the diagonally rearward center of the combustion chamber 20. Therefore, the hot air discharged from the burner 13 and reaching the front end of the air guide plate 23 is guided to the communication port 22 through the arrangement portions of the temperature sensors 171 and 172.

  As shown in FIGS. 3 and 4, the temperature sensor (hereinafter referred to as “first temperature sensor”) 171 on the left side wall 20 </ b> C is disposed on the left side of the flame hole 130 located at the leftmost end of the burner 13, and A temperature sensor (hereinafter referred to as “second temperature sensor”) 172 on the wall 20 </ b> C is disposed on the right side of the flame hole 130 positioned at the rightmost end of the burner 13. That is, the first temperature sensor 171 and the second temperature sensor 172 are both provided on the side of the flame hole 130. Therefore, when the burner 13 is in a normal combustion state, the combustion flame of gas formed behind the flame hole 130 does not contact the first temperature sensor 171 and the second temperature sensor 172. In addition, a portion of the external air taken into the combustion chamber 20 from the air supply port 112 does not pass through the periphery of the flame hole 130, and passes through the gap 24 provided around the left and right side ends of the burner 13. Since the temperature sensor 171 and the second temperature sensor 172 are guided to the periphery, even if the combustion flame fluctuates, the temperature around the first temperature sensor 171 and the second temperature sensor 172 is stabilized. Therefore, the combustion state of the burner 13 can be accurately detected.

  As shown in FIG. 5, a burner operation unit 41 for manually igniting and extinguishing the burner 13 and a voice output unit for notifying operation information of the heating cooker 1 by voice are provided on the front surface portion 111 of the main body case 11. 42 and the display part 43 which displays the operation information of the heating cooker 1 are provided. The burner operation unit 41 also has a thermal power adjustment function for manually setting the thermal power of the burner 13.

  A gas valve 44 that adjusts the amount of gas supplied to the burner 13 in accordance with an ignition operation or a fire extinguishing operation by the burner operation unit 41 is incorporated inside the main body case 11, and gas is supplied to the gas supply port 131 of the burner 13. The gas ejection nozzle for ejecting is connected to the gas valve 44. Although not shown, the gas valve 44 is opened when the ignition operation is performed by the burner operation unit 41 and closed when the combustion detection flame is not detected by the flame detection sensor 15 and the ignition operation is performed by the burner operation unit 41. The main valve that opens when the fire extinguishing operation is performed, the needle valve that is adjusted in accordance with the heating power set by the burner operation unit 41, and the gas to the burner 13 according to an instruction from the control circuit 5 The valve unit is composed of a thermal power switching valve for switching the supply amount, and the thermal power of the burner 13 is appropriately adjusted by these valves.

  In addition, a control circuit 5 that controls the operation of the entire heating cooker 1 is incorporated inside the main body case 11, and includes a circulation fan 14, a flame detection sensor 15, a spark plug 16, a burner operation unit 41, a first temperature. The sensor 171, the second temperature sensor 172, the sound output unit 42, the display unit 43, and the gas valve 44 are connected to the control circuit 5 through electric wiring.

  The control circuit 5 ignites and extinguishes the burner 13 based on the output value of the burner control unit that performs ignition and extinguishing of the burner 13, heating power adjustment, the fan control unit that operates and stops the circulation fan 14, and the flame detection sensor 15. It has a circuit configuration such as a point fire extinguishing judgment unit for judging.

  In addition, the control circuit 5 includes a blockage determination unit that determines the blockage state of the air supply port 112 based on the detected temperature difference | T1−T2 | between the first temperature sensor 171 and the second temperature sensor 172, and a detected temperature difference | T1. -T2 | is a time measuring unit for measuring the temperature deviation time S1 in a state where it is larger than the reference value Ts, and a first time for determining abnormal combustion of the burner 13 based on whether or not the temperature deviation time S1 has reached a predetermined time Sn. By the abnormal combustion determination unit, the second abnormal combustion determination unit, and the first abnormal combustion determination unit that determine abnormal combustion of the burner 13 based on the detected temperatures T1 and T2 of the first temperature sensor 171 and the second temperature sensor 172, respectively. The storage unit for storing the abnormality determination number N1 determined as the abnormal combustion of the burner 13, the abnormality number determination unit for determining whether or not the abnormality determination number N1 has reached the predetermined number Ns, and the burner 13 being in the abnormal combustion state It has a circuit configuration of the abnormality notifying unit or the like for notification from the audio output unit 42 and the display unit 43.

  Next, the abnormal combustion determination operation of the burner 13 by the control circuit 5 will be described with reference to FIG. In the cooking device 1, the main control program of the control circuit 5 is activated by operating a power switch (not shown) provided on the front surface portion 111 of the main body case 11 and turning on the power. The control action to be executed is ready to be executed.

  When an ignition operation is performed by the burner operation unit 41, the circulation fan 14 is activated and spark is discharged from the spark plug 16, and the electromagnetic on-off valve and the main valve of the gas valve 44 are opened. In conjunction with the ignition operation, the opening of the needle valve of the gas valve 44 is adjusted to a predetermined ignition opening. Thereby, external air (secondary air) is taken into the combustion chamber 20 from the air supply port 112, and a predetermined amount of gas is supplied to the burner 13 together with air around the gas supply port 131 (primary air), It is mixed in the burner at a concentration suitable for ignition. And it discharge | releases to the back of the combustion chamber 20 from each flame hole 130, and is ignited by the said spark discharge (ST1-ST3).

  Although not shown, when the burner operation portion 41 is operated after the burner 13 is ignited in step ST3, the opening degree of the needle valve of the gas valve 44 is changed in accordance with the operation. Is done. Thereby, the heating power of the burner 13 is adjusted. Further, when the burner 13 is ignited and misfires for some reason and the flame detection sensor 15 no longer detects the combustion flame, the electromagnetic on-off valve of the gas valve 44 is closed and the gas supply to the burner 13 is forced. To stop. Thereby, the gas leak from the burner 13 is prevented.

  The detected temperature of the first temperature sensor 171 (hereinafter referred to as “first detected temperature”) T1 and the detection of the second temperature sensor 172 until the burner operation unit 41 performs a fire extinguishing operation after the burner 13 is ignited. An absolute value | T1-T2 | of a difference from a temperature (hereinafter referred to as “second detected temperature”) T2 is calculated, and the calculated detected temperature difference | T1-T2 | is a predetermined reference value Ts (for example, 50 deg). ) And whether or not at least one of the first detection temperature T1 and the second detection temperature T2 has reached a predetermined upper limit value Th (for example, 250 ° C.) is monitored (ST4). To ST6).

  When the detected temperature difference | T1-T2 | is equal to or less than the reference value Ts (No in step ST4) and both the first detected temperature T1 and the second detected temperature T2 are lower than the upper limit value Th (step ST5). No), external air is normally introduced from the air supply port 112 to the entire periphery of each flame hole 130 of the burner 13, and the flow of hot air in the hot air derivation path 200 is normal, that is, the burner 13 is normally burned. The heating cooking operation is continued as the state. After that, when a fire extinguishing operation is performed by the burner operation unit 41 (Yes in step ST6), the main valve of the gas valve 44 is closed to cut off the supply of gas to the burner 13, and the burner 13 is extinguished and circulated. The fan 14 is stopped and the process returns to the step ST1 (ST7 to ST8).

  On the other hand, after the burner 13 is ignited, if the detected temperature difference | T1-T2 | becomes larger than the reference value Ts (Yes in step ST4), the air supply port 112 is closed and the combustion chamber 20 Assuming that the flow of external air to some areas has deteriorated, measurement of the temperature deviation time S1 is started in the time measuring section, and the above-described monitoring of the first detection temperature T1 and the second detection temperature T2 (ST5), fire extinguishing operation In addition to monitoring the presence or absence (ST6) and monitoring the detected temperature difference | T1-T2 | (ST4), it is monitored whether or not the temperature deviation time S1 has reached a predetermined time Sn (for example, 5 seconds) (ST9). ~ ST10).

  In addition, the blockage of the air supply port 112 is eliminated and the detected temperature difference | is determined during the period from the start of the measurement of the temperature deviation time S1 until the temperature deviation time S1 reaches the predetermined time Sn (No in step ST10). When T1-T2 | becomes equal to or less than the reference value Ts (No in step ST4), the measurement of the temperature deviation time S1 is stopped (not shown) assuming that the original normal combustion state is restored, and step ST5 is performed. Do.

  After the measurement of the temperature deviation time S1, when the temperature deviation time S1 reaches the predetermined time Sn (Yes in step ST10), the air supply port 112 is blocked and the partial area in the combustion chamber 20 is closed. Assuming that the flow of external air has deteriorated and the burner 13 is in an abnormal combustion state, the voice output unit 42 notifies the display unit 43 that the burner 13 is in an abnormal combustion state. Then, the measurement of the temperature deviation time S1 is stopped, and “1” is added and stored in the abnormality determination number N1 (“0” in the initial state) stored in the storage unit, so that the abnormality determination number N1 is a predetermined number Ns (for example, 5 times) is determined (ST11 to ST14).

  As a result, if the abnormality determination number N1 has not reached the predetermined number Ns (No in step ST14), the cause of abnormal combustion may be temporary, so step ST5 is performed. After that, when the cause of abnormal combustion is resolved and the detected temperature difference | T1-T2 | returns to the reference value Ts or less (Yes in step ST4), it is stored in the storage unit as having returned to the original normal combustion state. The abnormality determination number N1 is reset to “0” (not shown), and step ST5 is performed.

  Although not shown in the figure, after the abnormal combustion of the burner 13 is notified from the sound output unit 42 and the display unit 43, the front surface of the main body case 11 in a state where the detected temperature difference | T1-T2 | has returned to the reference value Ts or less. When a predetermined notification stop operation is performed by an operation switch (not shown) provided in the section 111, the abnormal combustion notification is stopped.

  On the other hand, as a result of repeating the steps ST4 to ST14, if the abnormality determination number N1 reaches the predetermined number Ns (Yes in step ST14), it is stored that the cause of the abnormal combustion cannot be easily eliminated. The abnormality determination count N1 stored in the unit is reset to “0”, the burner 13 is forcibly extinguished, and the circulation fan 14 is stopped (ST15, ST7 to ST8).

  If at least one of the first detection temperature T1 and the second detection temperature T2 reaches the upper limit value Th during the steps ST4 to ST6 (Yes in step ST5), the process proceeds to the burner 13. The sound output unit 42 informs that the burner 13 is in an abnormal combustion state, assuming that the burner 13 is abnormally burned due to an increase in the gas pressure supplied, a decrease in the amount of primary air, an exhaust failure from the combustion chamber 20, or the like. And is displayed on the display unit 43, the burner 13 is forcibly extinguished, and the circulation fan 14 is stopped (ST16, ST7 to ST8).

  Thus, in the heating cooker 1, the state where the detected temperature difference | T1−T2 | between the two temperature sensors 171 and 172 spaced apart from each other in the hot air derivation path 200 is larger than the reference value Ts is predetermined. If it continues for more than time Sn, it will determine with the burner 13 being in an abnormal combustion state, Therefore Even if the obstruction | occlusion conditions of the air inlet 112 differ, the abnormal combustion of the burner 13 can be detected exactly. Therefore, a cooking device with high detection accuracy can be provided.

  In this case, even if it is determined that the burner 13 is in an abnormal combustion state, the cooking operation is not prohibited while the number of times determined to be abnormal combustion (number of times of abnormality determination) N1 is less than the predetermined number Ns. Therefore, since only the notification that the abnormal combustion has occurred in the burner 13 is performed, there is no problem that the use is immediately restricted although the cause of the abnormal combustion can be easily eliminated. Therefore, it is possible to provide a cooking device that has high detection accuracy and is easy to use.

  On the other hand, if the abnormality determination number N1 is equal to or greater than the predetermined number Ns, the cause of the abnormal combustion may be due to the fact that the user cannot deal with such as clogging of the flame holes or malfunction of the gas valve. In this case, after the cooking operation is prohibited, a notification that abnormal combustion has occurred in the burner 13 is performed. Thereby, the problem that it can continue to be used in a state where there is a malfunction in the device does not occur. Therefore, it is possible to provide a cooking device with high detection accuracy and better usability.

  In addition, in this case, even if it is determined that the burner 13 is in an abnormal combustion state, if the cause of the abnormal combustion is resolved and a state where the detected temperature difference | T1-T2 | Since the record of the number of times is erased, there is no problem that sudden use is restricted during long-term use even though the cause of abnormal combustion can be easily eliminated. Therefore, it is possible to provide a cooking device that is even easier to use.

  In this case, even if the detected temperature difference | T1-T2 | is equal to or less than the reference value Ts, if either the first detected temperature T1 or the second detected temperature T2 reaches the upper limit Th, Since it is determined that 13 is in an abnormal combustion state, abnormal combustion of the burner 13 can be detected more reliably. Therefore, a cooking device with higher detection accuracy can be provided.

  In the above embodiment, after the burner 13 is ignited, when the temperature deviation time S1 reaches the predetermined time Sn, if the abnormality determination number N1 has not reached the predetermined number Ns, only the abnormal combustion is notified. Although the control configuration for maintaining the combustion state of 13 is used, abnormal control may be notified and the control power for limiting the heating power of the burner 13 to low heat may be used.

DESCRIPTION OF SYMBOLS 1 Heating cooker 10 Heating chamber 11 Main body case 112 Air supply opening 13 Burner 130 Flame hole 14 Circulation fan 171 1st temperature sensor 172 2nd temperature sensor 20 Combustion chamber 200 Hot air derivation path 42 Audio | voice output part (notification means)
43 Display (notification means)
5 Control circuit

Claims (4)

A heating chamber that accommodates an object to be heated, a burner that emits and burns gas from a plurality of flame holes arranged in parallel in the same direction, generates a hot air, a combustion chamber in which the burner is disposed, and the hot air in the combustion chamber A heating cooker configured to take in the air outside the main body from the air supply port into the combustion chamber and guide it around each flame hole of the burner. There,
Two temperature sensors are provided apart from each other in the direction in which the flame holes are juxtaposed in the hot air outlet path in the combustion chamber,
A heating cooker configured to determine that the burner is in an abnormal combustion state when a temperature difference between the temperature sensors is greater than a reference value for a predetermined time or longer. The heating cooker according to claim 1, wherein
When the number of abnormality determinations determined to be in the abnormal combustion state is less than a predetermined number, allowing the cooking operation while allowing the abnormal combustion of the burner to be notified from the notification means,
When the abnormality determination number is equal to or greater than a predetermined number, the cooking device is configured to prohibit the cooking operation and to notify the abnormal combustion of the burner from the notification unit. The cooking device according to claim 2,
After the burner is determined to be in an abnormal combustion state, if the detected temperature difference is greater than a reference value for less than a predetermined time, it is determined that the burner is in a normal combustion state, and the number of abnormal determinations is recorded. A cooking device that eliminates the heat. The cooking device according to any one of claims 1 to 3,
A cooking device configured to determine that the burner is in an abnormal combustion state when a temperature detected by at least one of the temperature sensors reaches a predetermined upper limit value.

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