JP6607801B2 - Gas burning equipment - Google Patents

Description

  The technology disclosed in the present specification relates to a gas combustion device.

  Patent Document 1 discloses a gas combustion device including a plurality of burners in a grill cabinet. In this gas combustion device, an upper fire burner is provided in the upper part of the grill warehouse, and a lower fire burner is provided in the lower part of the grill warehouse. In this gas combustion device, double-sided firing mode that burns both the upper and lower burners, upper-fire mode that burns the upper fire burner and extinguishes the lower fire burner, and extinguishes the upper fire burner. It can be operated in the lower-fire mode where the fire burner is burned.

JP-A-11-125427

  In many gas combustion devices, if the burner does not ignite while the gas is supplied to the burner, or if the burner is extinguished unexpectedly (in this specification, in any case, A safety mechanism is provided to prevent the release of raw gas from the burner. Such a safety mechanism includes a combustion detection circuit that outputs a misfire detection signal when the burner is not combusting, a gas supply to the burner, and an input of the misfire detection signal to the burner. This is realized by a safety circuit that outputs a gas supply stop signal for stopping the supply of the gas. Such a combustion detection circuit and a safety circuit are normally provided as a circuit separate from the microcomputer so that safety can be ensured even if the microcomputer controlling the gas combustion device goes out of control.

  When a part of a plurality of burners in the combustion chamber is intentionally extinguished as in the upper-fired mode and the lower-fired mode of the gas combustion device of Patent Document 1, the safety circuit is erroneously set. For a burner that is intentionally extinguished so that it does not operate, it is necessary to cancel the misfire detection signal from the combustion detection circuit. For this reason, in such a gas combustion device, it is connected between the combustion detection circuit and the safety circuit, and cancels the misfire detection signal of the combustion detection circuit when the misfire detection cancel signal is output from the microcomputer. It is preferable to provide a control circuit. Thus, for a burner that is intentionally extinguished, the misfire detection cancel signal of the combustion detection circuit corresponding to the burner can be canceled by outputting a misfire detection cancel signal from the microcomputer. It is possible to prevent the safety circuit from operating erroneously, and it is possible to improve user convenience.

  However, when the cancel control circuit as described above is provided, a misfire detection cancel signal may be output for all the combustion detection circuits due to the runaway of the microcomputer. In such a case, if the misfire detection signal of all combustion detection circuits is canceled, if the burner being burned is misfired, raw gas may be released into the combustion chamber, which may impair safety. There is. A technique that can ensure safety while improving user convenience is expected.

  In this specification, the technique which solves said subject is provided. The present specification provides a technology capable of ensuring safety while improving user convenience in a gas appliance including a plurality of burners in a combustion chamber.

  The present specification discloses a gas combustion apparatus including a plurality of burners in a combustion chamber. The gas combustion device is arranged corresponding to a microcomputer and a plurality of burners, and when a corresponding burner is not combusting, a plurality of combustion detection circuits that output a misfire detection signal, and a gas to the plurality of burners When a misfire detection signal is input, a safety circuit that outputs a gas supply stop signal for stopping gas supply to the plurality of burners, and a plurality of combustion detection circuits and the safety circuit A cancel control circuit is provided, to which a plurality of misfire detection cancel signals output from the microcomputer are input in response to the plurality of combustion detection circuits. The cancel control circuit is configured to cancel the misfire detection signal of the corresponding combustion detection circuit in response to the misfire detection cancel signal output from the microcomputer. The cancellation control circuit is configured not to simultaneously cancel the misfire detection signal for at least some of the plurality of combustion detection circuits.

  In the gas combustion device, when a misfire detection cancel signal is output from the microcomputer, the cancel control circuit cancels the misfire detection signal of the corresponding combustion detection circuit. With this configuration, when a part of the burners in the combustion chamber is burned and the remaining burners are intentionally extinguished, the misfire of the combustion detection circuit corresponding to the burner that is intentionally extinguished By canceling the detection signal, it is possible to prevent the safety circuit from operating erroneously. User convenience can be improved.

  In the gas combustion apparatus, the cancel control circuit is configured not to cancel the misfire detection signal at the same time for at least some of the plurality of combustion detection circuits. By adopting such a configuration, even if a misfire detection cancel signal is output for all combustion detection circuits due to a microcomputer runaway, the misfire detection signals of all combustion detection circuits are canceled. Can be prevented. Safety can be ensured.

  The gas combustion device can be configured such that the combustion chamber is a cooking grill chamber.

  In the grill for cooking, it is possible to burn a part of the burners in the combustion chamber and intentionally extinguish the remaining burners as in the upper-fire mode and the lower-fire mode in Patent Document 1. By doing so, user convenience can be improved. According to the gas combustion device described above, safety can be ensured while improving user convenience in a gas combustion device including a plurality of burners in a cooking grill.

It is a figure which shows typically the structure of the gas combustion apparatus 2 of an Example. It is a figure which shows a part of circuit structure of the gas combustion apparatus 2 of an Example. It is a figure which shows a part of circuit structure of the gas combustion apparatus 2 of an Example.

(Example)
FIG. 1 shows a schematic configuration of a gas combustion device 2 of the present embodiment. The gas combustion device 2 according to the present embodiment is a cooking gas stove including a first stove 4, a second stove 6, and a third stove 8 disposed in an upper portion and a grill 10 disposed inside.

  The first stove 4 has a first stove burner 12, a first stove ignition device 14 that ignites the first stove burner 12, and a first stove flame detector 16 that detects the presence or absence of flame in the first stove burner 12. Is provided. The second stove 6 includes a second stove burner 18, a second stove ignition device 20 that ignites the second stove burner 18, and a second stove flame detector 22 that detects the presence or absence of flame in the second stove burner 18. Is provided. The third stove 8 includes a third stove burner 24, a third stove ignition device 26 that ignites the third stove burner 24, and a third stove flame detector 28 that detects the presence or absence of flame in the third stove burner 24. Is provided.

  The grill chamber 10 includes an upper burner 30 that burns flames downward from the upper portion inside the grill chamber 10, an upper ignition device 32 that ignites the upper burner 30, and an upper portion that detects the presence or absence of flame in the upper burner 30. A flame detector 34, a first lower burner 36 and a second lower burner 38 for burning the flame upward from the lower part inside the grill 10, and a first lower igniter 40 for igniting the first lower burner 36; The second lower ignition device 42 for igniting the second lower burner 38, the first lower flame detector 44 for detecting the presence or absence of flame in the first lower burner 36, and the presence or absence of flame in the second lower burner 38 are detected. A second lower flame detector 46 is provided.

  Gas is supplied to the gas combustion device 2 via the gas supply path 48. A main electromagnetic valve 50 is interposed in the gas supply path 48. The gas supply path 48 branches into a first stove gas supply path 52, a second stove gas supply path 54, a third stove gas supply path 56, and a grill box gas supply path 58.

  The first stove gas supply path 52 supplies gas to the first stove burner 12. A first stove solenoid valve 60 is interposed in the first stove gas supply path 52. The second stove gas supply path 54 supplies gas to the second stove burner 18. A second stove electromagnetic valve 62 is interposed in the second stove gas supply path 54. The third stove gas supply path 56 supplies gas to the third stove burner 24. A third stove electromagnetic valve 64 is interposed in the third stove gas supply path 56.

  A grill cabinet electromagnetic valve 66 is interposed in the grill cabinet gas supply path 58. The grill warehouse gas supply path 58 branches into an upper gas supply path 68 and a lower gas supply path 70. An upper electric valve 72 is interposed in the upper gas supply path 68. The upper gas supply path 68 supplies gas to the upper burner 30. A lower electric valve 74 is interposed in the lower gas supply path 70. The lower gas supply path 70 is branched into a first lower gas supply path 76 and a second lower gas supply path 78. The first lower gas supply path 76 supplies gas to the first lower burner 36. The second lower gas supply path 78 supplies gas to the second lower burner 38.

  In addition to the microcomputer 100, the gas combustion device 2 incorporates various electric circuits described later. In the gas combustion device 2, the microcomputer 100 and various electric circuits cooperate to control the operation of each component.

  2 and 3 show a circuit configuration related to control of the operation of the grill 10 in the gas combustion device 2.

  As shown in FIG. 2, the microcomputer 100 outputs a watchdog pulse signal WD. The watchdog pulse signal WD has an H potential (the same potential as the power supply potential Vcc, for example, 12V) and an L potential (the same potential as the ground potential Vo, for example, 0V) alternately in a predetermined cycle. It is a rectangular pulse signal that is repeated. The watchdog pulse signal WD is input to the pulse detection circuits 102 and 104, respectively. The pulse detection circuits 102 and 104 output an H potential when the input signal (watchdog pulse signal WD) is a predetermined rectangular pulse signal, and output an L potential when the input signal is any other signal. To do. That is, the pulse detection circuits 102 and 104 output an H potential when the watchdog pulse signal WD is normally input from the microcomputer 100, and when the abnormal watchdog pulse signal WD is input from the microcomputer 100, L potential is output.

  The microcomputer 100 outputs a main electromagnetic valve drive signal MD. The main electromagnetic valve drive signal MD outputs an H potential when the main electromagnetic valve 50 is opened, and outputs an L potential when the main electromagnetic valve 50 is closed. The main solenoid valve drive signal MD is input to the NAND circuit 106 together with the output signal of the pulse detection circuit 102. The output of the NAND circuit 106 is input to the NOT circuit 108. The output of the NOT circuit 108 is input as the positive power supply potential of the NOT circuit 110. The output signal of the comparator 116 of the hardware safety timer circuit 114 described later is input to the NOT circuit 110 via the diode 112 for preventing reverse current. As will be described later, the output signal of the comparator 116 of the hard safety timer circuit 114 is L potential when the gas combustion device 2 is operating normally, and H potential when an abnormality occurs. The output of the NOT circuit 110 is connected to the plus terminal of the main solenoid valve 50 via the resistor 118. The negative terminal of the main solenoid valve 50 is connected to the ground potential Vo. An antiparallel diode 120 is connected to the main solenoid valve 50. The output of the NOT circuit 110 is input to the microcomputer 100 as the main electromagnetic valve response signal MA.

  The main solenoid valve 50 is opened and closed as follows. When the watchdog pulse signal WD is not normally output from the microcomputer 100 or when the main solenoid valve drive signal MD is at the L potential, the NAND circuit 106 outputs the H potential, and the NOT circuit 108 outputs the L potential. Output. In this case, since the positive power supply potential of the NOT circuit 110 becomes the L potential, the NOT circuit 110 outputs the L potential regardless of the input to the NOT circuit 110, and the main electromagnetic valve 50 has a voltage. Is not applied, and the main solenoid valve 50 is closed. When the watchdog pulse signal WD is normally output from the microcomputer 100 and the main solenoid valve drive signal MD is at the H potential, the NAND circuit 106 outputs the L potential, and the NOT circuit 108 outputs the H potential. In this case, since the positive power supply potential of the NOT circuit 110 becomes the H potential, the output of the NOT circuit 110 changes according to the output signal of the comparator 116 of the hard safety timer circuit 114. When the gas combustion device 2 is operating normally, the output signal of the comparator 116 of the hardware safety timer circuit 114 is L potential, and the NOT circuit 110 outputs H potential. As a result, a voltage is applied to the main electromagnetic valve 50, and the main electromagnetic valve 50 is opened. When an abnormality has occurred, the output signal of the comparator 116 of the hardware safety timer circuit 114 is at the H potential, and the NOT circuit 110 outputs the L potential. As a result, no voltage is applied to the main solenoid valve 50, and the main solenoid valve 50 is closed.

  The microcomputer 100 outputs a grill storage electromagnetic valve drive signal GD. The grill storage electromagnetic valve drive signal GD is output as an H potential when the grill storage solenoid valve 66 is opened, and is output as an L potential when the grill storage solenoid valve 66 is closed. The grill storage electromagnetic valve drive signal GD is input to the NAND circuit 122 together with the output signal of the pulse detection circuit 102. The output of the NAND circuit 122 is input to the NOT circuit 124. The output of the NOT circuit 124 is input as the positive power supply potential of the NOT circuit 126. The output signal of the comparator 116 of the hard safety timer circuit 114 is input to the NOT circuit 126 via the diode 128 for preventing reverse current. The output signal of the comparator 116 of the hard safety timer circuit 114 is an L potential when the gas combustion device 2 is operating normally, and is an H potential when an abnormality occurs. The output of the NOT circuit 126 is connected to the plus terminal of the grill box electromagnetic valve 66 through the resistor 130. The minus terminal of the grill cabinet electromagnetic valve 66 is connected to the ground potential Vo. An antiparallel diode 132 is connected to the grill cabinet electromagnetic valve 66. Further, the output of the NOT circuit 126 is input to the microcomputer 100 as a grill storage electromagnetic valve response signal GA.

  The grill box electromagnetic valve 66 is opened and closed as follows. When the watchdog pulse signal WD is not normally output from the microcomputer 100 or when the grill cabinet electromagnetic valve drive signal GD is at the L potential, the NAND circuit 122 outputs the H potential and the NOT circuit 124 outputs the L potential. Is output. In this case, since the positive power supply potential of the NOT circuit 126 becomes the L potential, the NOT circuit 126 outputs the L potential regardless of the input to the NOT circuit 126, and the grill electromagnetic valve 66 No voltage is applied, and the grill box electromagnetic valve 66 is closed. When the watchdog pulse signal WD is normally output from the microcomputer 100 and the grill storage solenoid valve drive signal GD is at the H potential, the NAND circuit 122 outputs the L potential, and the NOT circuit 124 outputs the H potential. In this case, since the positive power supply potential of the NOT circuit 126 becomes the H potential, the output of the NOT circuit 126 changes according to the output signal of the comparator 116 of the hard safety timer circuit 114. When the gas combustion device 2 is operating normally, the output signal of the comparator 116 of the hardware safety timer circuit 114 is L potential, and the NOT circuit 126 outputs H potential. As a result, a voltage is applied to the grill cabinet electromagnetic valve 66 and the grill cabinet solenoid valve 66 is opened. When an abnormality has occurred, the output signal of the comparator 116 of the hardware safety timer circuit 114 is an H potential, and the NOT circuit 126 outputs an L potential. As a result, no voltage is applied to the grill cabinet electromagnetic valve 66, and the grill cabinet solenoid valve 66 is closed.

  The microcomputer 100 outputs a first upper electric valve drive signal UD1 and a second upper electric valve drive signal UD2. The first upper electric valve drive signal UD1 and the second upper electric valve drive signal UD2 are input to the motor driver circuit 134. The motor driver circuit 134 opens and closes the upper electric valve 72 by controlling the voltage applied to the upper electric valve 72. When the first upper electric valve drive signal UD1 is at the H potential and the second upper electric valve drive signal UD2 is at the L potential, the motor driver circuit 134 opens the upper electric valve 72. In other cases, the motor driver circuit 134 closes the upper motor-operated valve 72.

  The microcomputer 100 outputs a first lower electric valve drive signal LD1 and a second lower electric valve drive signal LD2. The first lower electric valve drive signal LD1 and the second lower electric valve drive signal LD2 are input to the motor driver circuit 136. The motor driver circuit 136 opens and closes the lower electric valve 74 by controlling the voltage applied to the lower electric valve 74. When the first lower electric valve drive signal LD1 is at the H potential and the second lower electric valve drive signal LD2 is at the L potential, the motor driver circuit 136 opens the lower electric valve 74. In other cases, the motor driver circuit 136 closes the lower motor-operated valve 74.

  As shown in FIG. 3, the upper flame detector 34 is a thermocouple having a plus terminal connected to the ground potential Vo, and outputs a detection signal from the minus terminal. The detection signal of the upper flame detector 34 is input to the NOT circuit 142 via the inverting amplifier circuit 138 and the comparator 140. The output of the NOT circuit 142 becomes H potential when the upper burner 30 is extinguished, and becomes L potential when the upper burner 30 is ignited. The output of the NOT circuit 142 can be said to be a misfire detection signal for the upper flame detector 34. The detection signal of the upper flame detector 34 is input to the microcomputer 100 as the upper flame monitoring signal UF via the inverting amplification circuit 144.

  The first lower flame detector 44 is a thermocouple having a plus terminal connected to the ground potential Vo, and outputs a detection signal from the minus terminal. The detection signal of the first lower flame detector 44 is input to the NOT circuit 150 via the inverting amplifier circuit 146 and the comparator 148. The output of the NOT circuit 150 becomes H potential when the first lower burner 36 is extinguished, and becomes L potential when the first lower burner 36 is ignited. It can be said that the output of the NOT circuit 150 is a misfire detection signal for the first lower flame detector 44. The detection signal of the first lower flame detector 44 is input to the microcomputer 100 as the first lower flame monitoring signal LF1 via the inverting amplifier circuit 152.

  The second lower flame detector 46 is a thermocouple having a plus terminal connected to the ground potential Vo, and outputs a detection signal from the minus terminal. The detection signal of the second lower flame detector 46 is input to the NOT circuit 158 via the inverting amplifier circuit 154 and the comparator 156. The output of the NOT circuit 158 becomes H potential when the second lower burner 38 is extinguished, and becomes L potential when the second lower burner 38 is ignited. The output of the NOT circuit 158 can be said to be a misfire detection signal for the second lower flame detector 46. The detection signal of the second lower flame detector 46 is input to the microcomputer 100 as the second lower flame monitoring signal LF2 via the inverting amplifier circuit 160.

  The output of the NOT circuit 142 corresponding to the upper flame detector 34, the output of the NOT circuit 150 corresponding to the first lower flame detector 44, and the output of the NOT circuit 158 corresponding to the second lower flame detector 46 are ORed. Input to the circuit 162. The OR circuit 162 outputs a grill storage misfire detection signal GF. The grill warehouse misfire detection signal GF is H potential when a misfire occurs in the grill warehouse 10, and L potential when no misfire occurs in the grill warehouse 10.

  The microcomputer 100 outputs an upper misfire detection cancel signal UFC and a lower misfire detection cancel signal LFC. For example, when the microcomputer 100 intentionally extinguishes the upper burner 30 and cancels misfire detection by the upper flame detector 34, the microcomputer 100 outputs an H potential as the upper misfire detection cancel signal UFC. For example, when the upper burner 30 is burned, the microcomputer 100 outputs the L potential as the upper misfire detection cancel signal UFC when the upper flame detector 34 detects the misfire. Similarly, the microcomputer 100 cancels misfire detection by the first lower flame detector 44 and the second lower flame detector 46 when the first lower burner 36 and the second lower burner 38 are intentionally extinguished, for example. The H potential is output as the lower misfire detection cancel signal LFC. In addition, when the microcomputer 100 performs misfire detection by the first lower flame detector 44 and the second lower flame detector 46 when, for example, the first lower burner 36 and the second lower burner 38 are burned, the lower misfire detection cancellation The L potential is output as the signal LFC.

  The upper misfire detection cancel signal UFC and the lower misfire detection cancel signal LFC are input to the cancel control circuit 164, respectively. In the cancel control circuit 164, the upper misfire detection cancel signal UFC is input to the NOT circuit 168 via the resistor 166. The output of the NOT circuit 168 is connected to the output of the NOT circuit 142 corresponding to the upper flame detector 34. Therefore, when the L potential is input to the NOT circuit 168, the output of the NOT circuit 168 becomes the H potential, and the potential corresponding to the detection signal of the upper flame detector 34 is input from the NOT circuit 142 to the OR circuit 162. Will be. That is, in this case, misfire detection by the upper flame detector 34 is performed. Conversely, when the H potential is input to the NOT circuit 168, the output of the NOT circuit 168 becomes the L potential, and the L potential is transferred from the NOT circuit 142 to the OR circuit 162 regardless of the detection signal of the upper flame detector 34. Will be entered. That is, in this case, misfire detection by the upper flame detector 34 is cancelled.

  The lower misfire detection cancellation signal LFC is input to each of the NOT circuits 170 and 172. The output of the NOT circuit 170 is connected to the output of the NOT circuit 150 corresponding to the first lower flame detector 44. Therefore, when the L potential is input to the NOT circuit 170, the output of the NOT circuit 170 becomes the H potential, and the potential corresponding to the detection signal of the first lower flame detector 44 is transferred from the NOT circuit 150 to the OR circuit 162. Will be entered. That is, in this case, misfire detection by the first lower flame detector 44 is performed. On the other hand, when the H potential is input to the NOT circuit 170, the output of the NOT circuit 170 becomes the L potential, and the NOT circuit 150 to the OR circuit 162 has the L potential regardless of the detection signal of the first lower flame detector 44. A potential is input. That is, in this case, misfire detection by the first lower flame detector 44 is cancelled. The output of the NOT circuit 172 is connected to the output of the NOT circuit 158 corresponding to the second lower flame detector 46. Therefore, when the L potential is input to the NOT circuit 172, the output of the NOT circuit 172 becomes the H potential, and the potential corresponding to the detection signal of the second lower flame detector 46 is transferred from the NOT circuit 158 to the OR circuit 162. Will be entered. That is, in this case, misfire detection is performed by the second lower flame detector 46. Conversely, when the H potential is input to the NOT circuit 172, the output of the NOT circuit 172 becomes the L potential, and the NOT circuit 158 to the OR circuit 162 has the L potential regardless of the detection signal of the second lower flame detector 46. A potential is input. That is, in this case, the misfire detection by the second lower flame detector 46 is cancelled.

  Further, in the cancel control circuit 164, the lower misfire detection cancel signal LFC is input to the NOT circuit 174. The output of the NOT circuit 174 is connected between the input of the NOT circuit 168 corresponding to the upper misfire detection cancellation signal UFC and the resistor 166. Thus, when the lower misfire detection cancel signal LFC is at the H potential, the L potential is input to the NOT circuit 168 regardless of whether the upper misfire detection cancel signal UFC is at the H potential or the L potential. Become. That is, when the misfire detection by the first lower flame detector 44 and the second lower flame detector 46 is canceled, the misfire detection by the upper flame detector 34 is not canceled.

  As shown in FIG. 2, the grill storage misfire detection signal GF is input to the AND circuit 176 together with the output of the NOT circuit 124 corresponding to the grill storage solenoid valve 66. The output of the AND circuit 176 is input to the OR circuit 178. Although not shown in the figure, the OR circuit 178 also receives a misfire detection signal from the first stove burner 12, the second stove burner 18, and the third stove burner 24. The output of the OR circuit 178 is input to the NOT circuit 182 of the hardware safety timer circuit 114 via the NOT circuit 180. The output of the pulse detection circuit 104 is also connected to the input of the NOT circuit 182.

  When the gas combustion device 2 is operating normally, the H potential is output from the pulse detection circuit 104 and the H potential is also output from the NOT circuit 180. Therefore, the NOT circuit of the hardware safety timer circuit 114 is output. The H potential is input to 182. When the watchdog pulse signal WD is not normally output from the microcomputer 100, the L potential is output from the pulse detection circuit 104, and the L potential is input to the NOT circuit 182 of the hardware safety timer circuit 114. Alternatively, when the output of the NOT circuit 124 corresponding to the grill cabinet electromagnetic valve 66 is H potential and the grill cabinet misfire detection signal GF becomes H potential (that is, the grill cabinet solenoid valve 66 is opened and the grill cabinet 10 is opened). AND circuit 176 outputs an H potential and OR circuit 178 outputs an H potential, so that the L potential is output from NOT circuit 180 and the NOT of hardware safety timer circuit 114 is output. An L potential is input to the circuit 182.

  The output of the NOT circuit 182 of the hard safety timer circuit 114 is connected to the power supply potential Vcc via the resistor 184 and is connected to the non-inverting input of the comparator 116 via the resistor 186. The non-inverting input of the comparator 116 is connected to the ground potential Vo via the capacitor 188. The inverting input of the comparator 116 is connected to the power supply potential Vcc through the resistor 190 and is connected to the ground potential Vo through the resistor 192. That is, the reference potential corresponding to the voltage division ratio of the resistor 190 and the resistor 192 is input to the inverting input of the comparator 116.

  The operation of the hard safety timer circuit 114 will be described. When the gas combustion device 2 is operating normally, that is, when the input of the NOT circuit 182 is H potential, the NOT circuit 182 outputs L potential. In this case, since the L potential lower than the reference potential of the inverting input is input to the non-inverting input of the comparator 116, the comparator 116 outputs the L potential. In this case, as described above, the main solenoid valve 50 opens and closes in response to the main solenoid valve drive signal MD from the microcomputer 100, and the grill box solenoid valve 66 responds to the grill box solenoid valve drive signal GD from the microcomputer 100. Open and close.

  Thereafter, when an abnormality occurs and the input of the NOT circuit 182 is switched from the H potential to the L potential, the NOT circuit 182 outputs the H potential and charging of the capacitor 188 is started. When charge is accumulated in the capacitor 188 and the potential of the non-inverting input of the comparator 116 exceeds the reference potential of the inverting input, the comparator 116 outputs an H potential. In this case, as described above, the main solenoid valve 50 is closed regardless of the main solenoid valve drive signal MD from the microcomputer 100, and the grill box solenoid valve 66 is related to the grill box solenoid valve drive signal GD from the microcomputer 100. It will be closed.

  As described above, the gas combustion device 2 of this embodiment includes the upper burner 30, the first lower burner 36, and the second lower burner 38 (an example of a plurality of burners) in the cooking grill 10 (an example of the combustion chamber). ). The gas combustion device 2 is arranged corresponding to the microcomputer 100 and the upper burner 30, and when the upper burner 30 is not combusting, the upper flame detector 34 that outputs a misfire detection signal, an inverting amplification circuit 138, a comparator 140 and a NOT circuit 142 (an example of a combustion detection circuit) and a first lower flame which is arranged corresponding to the first lower burner 36 and outputs a misfire detection signal when the first lower burner 36 is not combusting. When the detector 44, the inverting amplifier circuit 146, the comparator 148, the NOT circuit 150 (an example of the combustion detection circuit) and the second lower burner 38 are disposed, and the second lower burner 38 is not combusted. A second lower flame detector 46 that outputs a misfire detection signal, an inverting amplifier circuit 154, a comparator 156, and a NOT circuit 158 (an example of a combustion detection circuit); When gas is supplied to the partial burner 30, the first lower burner 36, and the second lower burner 38 and a misfire detection signal is input, a signal (a plurality of signals) for closing the main electromagnetic valve 50 and the grill cabinet electromagnetic valve 66 is supplied. A hard safety timer circuit 114 (an example of a safety circuit) that outputs a gas supply stop signal for stopping the supply of gas to the burner, a NOT circuit 142, a NOT circuit 150, a NOT circuit 158, and a hard safety timer circuit 114. Connected to the upper flame detector 34 and output from the microcomputer 100 in correspondence with the upper flame detector 34, an upper misfire detection cancel signal UFC (an example of the misfire detection cancel signal), the first lower flame detector 44 and the second lower flame detector 44. Lower misfire detection cancel signal LFC (an example of misfire detection cancel signal) output from the microcomputer 100 in response to the flame detector 46 And a cancel control circuit 164 to be input. The cancel control circuit 164 responds to the upper misfire detection cancel signal UFC and the lower misfire detection cancel signal LFC input from the microcomputer 100, and corresponding upper flame detector 34, first lower flame detector 44, and second lower flame detection. The misfire detection signal for the vessel 46 is cancelled. The cancel control circuit 164 is configured not to simultaneously cancel the misfire detection signal for the upper flame detector 34 and the first lower flame detector 44 (or the upper flame detector 34 and the second lower flame detector 46). .

  Note that the specific configuration of the cancel control circuit 164 is not limited to the above configuration. When the upper misfire detection cancel signal UFC and the lower misfire detection cancel signal LFC are output from the microcomputer 100, the misfire detection signals of the upper flame detector 34, the first lower flame detector 44, and the second lower flame detector 46 are output. Any circuit may be used as long as the circuit is configured not to cancel any of them.

  In the above embodiment, the gas combustion device 2 may include an oven instead of the grill 10.

  Each embodiment has been described in detail above, but these are merely 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 the drawings exhibit 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 technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Gas combustion device 4: 1st stove 6: 2nd stove 8: 3rd stove 10: Grill box 12: 1st stove burner 14: 1st stove ignition device 16: 1st stove flame detector 18: 2nd stove Burner 20: Second stove ignition device 22: Second stove flame detector 24: Third stove burner 26: Third stove ignition device 28: Third stove flame detector 30: Upper burner 32: Upper ignition device 34: Upper flame Detector 36: 1st lower burner 38: 2nd lower burner 40: 1st lower ignition device 42: 2nd lower ignition device 44: 1st lower flame detector 46: 2nd lower flame detector 48: Gas supply path 50 : Main solenoid valve 52: First stove gas supply path 54: Second stove gas supply path 56: Third stove gas supply path 58: Grill box gas supply path 60: First stove solenoid valve 62: Second stove solenoid valve 64 : Third stove solenoid valve 66: Grill cabinet solenoid valve 68: Upper gas supply path 70: Lower gas supply path 72: Upper motor valve 74: Lower motor valve 76: First lower gas supply path 78: Second lower gas supply path 100: microcomputer 102: pulse detection circuit 104: pulse detection circuit 106: NAND circuit 108: NOT circuit 110: NOT circuit 112: diode 114: hardware safety timer circuit 116: comparator 118: resistor 120: antiparallel diode 122: NAND circuit 124: NOT circuit 126: NOT circuit 128: Diode 130: Resistor 132: Anti-parallel diode 134: Motor driver circuit 136: Motor driver circuit 138: Inverting amplifier circuit 140: Comparator 142: NOT circuit 144: Inverting amplifier circuit 146: Inverting Amplifier circuit 14 : Comparator 150: NOT circuit 152: Inverting amplifier circuit 154: Inverting amplifier circuit 156: Comparator 158: NOT circuit 160: Inverting amplifier circuit 162: OR circuit 164: Cancel control circuit 166: Resistor 168: NOT circuit 170: NOT circuit 172 : NOT circuit 174: NOT circuit 176: AND circuit 178: OR circuit 180: NOT circuit 182: NOT circuit 184: resistor 186: resistor 188: capacitor 190: resistor 192: resistor

Claims (2)

A gas combustion device having a plurality of burners in a combustion chamber,
A microcomputer,
A plurality of combustion detection circuits which are arranged corresponding to a plurality of burners and which output a misfire detection signal when the corresponding burners are not burning;
When a gas is supplied to a plurality of burners and a misfire detection signal is input, a safety circuit that outputs a gas supply stop signal for stopping the supply of gas to the plurality of burners;
It is connected between a plurality of combustion detection circuits and a safety circuit, and has a cancel control circuit to which a plurality of misfire detection cancellation signals output from a microcomputer are input in response to the plurality of combustion detection circuits.
The cancel control circuit is configured to cancel the misfire detection signal of the corresponding combustion detection circuit in response to the misfire detection cancel signal output from the microcomputer,
The cancel control circuit is a gas combustion device configured to not cancel the misfire detection signal at the same time for at least some of the plurality of combustion detection circuits.   The gas combustion apparatus according to claim 1, wherein the combustion chamber is a grill chamber for cooking.

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