JP6465732B2 - Gas combustion equipment - Google Patents

Description

  The present invention relates to a gas combustion apparatus. In particular, the present invention relates to a gas combustion apparatus having a self-holding solenoid valve for adjusting the thermal power.

  For example, in a gas stove, a main gas passage and a sub gas passage are connected in parallel to the gas burner, and an electromagnetic valve for temperature control is provided in the main gas passage, and the electromagnetic valve is micro-controlled during the combustion operation of the gas burner. An apparatus that adjusts the heating power of a gas burner by controlling opening and closing according to the temperature of the food by a computer or the like is known. In this type of gas stove, when the solenoid valve is opened, fuel gas is supplied to the gas burner from both the main gas passage and the sub gas passage, and the heating power of the gas burner becomes strong. A small amount of fuel gas is supplied to the gas burner only from the passage, and the heat of the gas burner becomes low.

  A self-holding solenoid valve such as a latch valve is used as the heating power adjusting solenoid valve. This self-holding solenoid valve is designed to hold either the valve open state or the valve closed state by the magnetic force of the magnet, etc., simply by energizing it temporarily when switching between opening and closing. Can be achieved.

  By the way, in a gas stove provided with a self-holding solenoid valve for thermal power adjustment, the state of the self-holding solenoid valve can be either the open state or the closed state depending on the thermal power at the end of the combustion operation. . On the other hand, if the power supply to the microcomputer that controls opening / closing of the self-holding solenoid valve is cut off at the end of the combustion operation, the open / close state of the self-holding solenoid valve cannot be grasped. Even if the power supply is resumed, the open / close state of the self-holding solenoid valve at the end of the previous combustion operation cannot be recognized. Therefore, when the self-holding solenoid valve is closed and the combustion operation ends, when the gas burner is ignited in the next combustion operation, only a small amount of fuel gas is supplied to the gas burner only through the auxiliary gas passage. Ignition failure tends to occur. Therefore, it is proposed to operate the self-holding solenoid valve in the opening direction regardless of the open / closed state of the self-holding solenoid valve when the gas burner is ignited or to keep the self-holding solenoid valve open when the gas burner is extinguished. (Patent Documents 1 and 2). Further, when the gas burner is ignited, it is necessary to operate other electronic devices such as an igniter. However, if a plurality of electronic devices are operated at the same time, the burden on the power source increases. Therefore, when operating the self-holding solenoid valve in the opening direction when the gas burner is ignited, it has been proposed to energize the self-holding solenoid valve and the other electronic devices so that the energization timing is asynchronous ( Patent Document 3).

JP-A-9-133356 JP 2000-28130 A Japanese Patent Laid-Open No. 9-133355

  However, when the user performs an ignition operation to ignite the gas burner, an electromagnetic safety valve or the like is opened and fuel gas begins to be supplied to the gas passage. Therefore, as in Patent Documents 1 and 3, when the self-holding solenoid valve is operated in the opening direction at the time of ignition of the gas burner regardless of the open / closed state of the self-holding solenoid valve, the self-holding type is stopped at the end of the previous combustion operation. When the solenoid valve is in the open state, not only the time for the initial check such as the power supply voltage check and the operation check of each solenoid valve, but also the time for energizing the self-holding solenoid valve to operate in the opening direction There is a problem that unburned gas leaks through both the main gas passage and the sub gas passage, and the gas odor is annoying. In particular, gas stoves equipped with communication devices that operate external devices such as ventilation fans during point-extinguishing of multiple self-holding solenoid valves and gas burners for high functionality are relatively large for operating these electronic devices. A current is required, and the voltage drop becomes large. Therefore, when using a battery as a power source, it is preferable to energize each electronic device so that the energization timing is asynchronous, as in Patent Document 3, but the energization time to a plurality of self-holding solenoid valves or other The time from the ignition operation until the gas burner is ignited becomes longer depending on the energization time of the electronic equipment, and the leakage of unburned gas increases.

  On the other hand, as in Patent Document 2, by controlling the self-holding solenoid valve to be opened when the gas burner is extinguished last time, the self-holding solenoid valve is opened in the opening direction when starting the next combustion operation. Since the gas burner can be ignited without waiting for the operation time, the time from the ignition operation until the gas burner is ignited can be shortened.

  However, since the self-holding solenoid valve is opened and closed by magnetic force or the like, a heavy pan or the like is placed on the gas burner between the end of the previous combustion operation and the start of the next combustion operation. Therefore, when a physical shock is applied to the gas stove, the valve open state may be canceled and the valve closed state may be obtained. Therefore, as in Patent Document 2, when starting the combustion operation, if the gas burner is ignited without operating the self-holding solenoid valve in the opening direction, the fuel gas is supplied only from the auxiliary gas passage. There is a problem that ignition failure occurs.

  The present invention solves the above problems, and an object of the present invention is to provide a self-holding solenoid valve that has a main gas passage and a sub gas passage and is controlled to be opened and closed in order to adjust the heating power in the main gas passage. An object of the present invention is to prevent leakage of unburned gas until the gas burner is ignited while preventing an ignition failure during ignition of the gas burner.

The present invention provides a main gas passage connected to a gas burner, at least one sub gas passage connected in parallel to the main gas passage, and a main gas passage, and adjusts the heating power of the gas burner during the combustion operation of the gas burner. A first self-holding solenoid valve that is controlled to open and close as much as possible, a current-carrying solenoid valve that is provided in the main gas passage upstream of the branch of the auxiliary gas passage and supplies and shuts off the fuel gas to the gas burner, and combustion A gas combustion device comprising a control unit for controlling operation,
Control unit, upon ignition of the gas burner, after opening the current holding type solenoid valve, the first self-holding type solenoid valve is opened held, after the first self-holding type solenoid valve is opened retained, and control in so that you energize the igniter,
A gas combustion device that controls the first self-holding solenoid valve to be closed and held after the energization holding solenoid valve is closed when the gas burner is extinguished.

When the first self-holding solenoid valve for adjusting the heating power of the gas burner is provided in the main gas passage, when the first self-holding solenoid valve is controlled to open and close for the heating power adjustment in the previous combustion operation, At the end of the combustion operation, the first self-holding solenoid valve can be in either an open state or a closed state. However, according to the gas combustion device, when the gas burner is ignited, after the energization holding solenoid valve is opened, the self holding solenoid valve is held open , and the first self holding solenoid valve is opened. after being held sufficiently from controlled to so that to energize the igniter, after the fuel gas from only the sub gas passage to the gas burner is supplied, at the time of energization of the igniter via a main gas passage and secondary gas passage to the gas burner A sufficient amount of fuel gas is supplied. In addition, when the gas burner is ignited, the energization timing to the first self-holding solenoid valve and the energization timing to the igniter do not overlap, so the burden on the power source can be reduced.
In addition, according to the gas combustion apparatus, when the gas burner is extinguished , the first self-holding solenoid valve is controlled to be closed after the energization holding solenoid valve is closed. Even if the first self-holding solenoid valve is open during operation, the next combustion operation can be started from the first self-holding solenoid valve in the closed state. Accordingly, control is performed so that the first self-holding solenoid valve is held open when the first self-holding solenoid valve is ended in the previous combustion operation or when the previous combustion operation is ended. Compared to the case where the gas burner is ignited, the fuel gas supplied to the gas burner can be reliably reduced from when the gas burner is ignited. Further, when the gas burner is extinguished, the energization timing to the energization holding solenoid valve and the energization timing to the first self-holding solenoid valve do not overlap, so the burden on the power source can be reduced.

In the gas combustion apparatus, preferably,
When the first self-holding solenoid valve is open when the gas burner is extinguished, the control unit operates the first self-holding solenoid valve in the closing direction to hold the first self-holding solenoid valve closed. To be controlled.

  According to the gas combustion device, if the first self-holding solenoid valve is open when the gas burner is extinguished, the first self-holding solenoid valve is operated in the closing direction, so that the first self-holding solenoid is surely operated. The valve can be held closed and the load on the power source can be reduced.

The gas combustion apparatus further includes:
A communication device for transmitting an operation signal to an external device is provided.
The control unit controls the first self-holding electromagnetic valve to be held open after transmitting an operation signal from the communication device to the external device when the gas burner is ignited.

In a gas combustion apparatus provided with a communication device for operating an external device, when the external device is operated when the gas burner is ignited, the energization of the first self-holding solenoid valve and the energization of the communication device are substantially parallel. Done. For this reason, if energization of these electronic devices is duplicated, the burden on the power source increases, and when the battery is used as a power source, battery consumption is promoted. Therefore, it is preferable to energize each electronic device so that the energization timings of the first self-holding solenoid valve and the communication device are asynchronous, respectively, but this further increases the time from the ignition operation until the gas burner is ignited. Longer and unburned gas leakage increases.
On the other hand, according to the gas combustion apparatus, when the gas burner is extinguished, the first self-holding solenoid valve is controlled to be closed, and when the gas burner is ignited, the first self-holding solenoid valve is controlled. Since the operation signal is transmitted from the communication device to the external device before the valve is held open, the time when the communication device is energized and the operation signal is transmitted from the communication device to the external device. The valve is held closed. Thereby, even in the gas combustion apparatus having the first self-holding solenoid valve and the communication device that communicates with the external device, the fuel gas supplied to the gas burner from the ignition operation to the ignition of the gas burner can be reliably reduced.

Preferably, the gas combustion device is
A plurality of sub gas passages connected in parallel with the main gas passage;
A second self-holding solenoid valve provided in at least one auxiliary gas passage,
Control unit, upon ignition of the gas burner, after opening the current holding type solenoid valve, the second self-holding type solenoid valve is opened held, after the second self-holding type solenoid valve is opened retained, and control in so that you energize the igniter,
At the time of extinguishing the gas burner, after the energization holding solenoid valve is closed, the second self-holding solenoid valve is controlled to be closed.

In the gas combustion apparatus, a plurality of sub gas passages are provided, and at least one sub gas passage is provided with a second self-holding solenoid valve. When the gas burner is ignited, the energization holding solenoid valve is opened. and then, the first and second self-holding type solenoid valves either to the open-valve state hold further after the first and second self-holding type solenoid valve is opened held, controlled to so that to energize the igniter Thus, after the fuel gas is supplied to the gas burner only from the auxiliary gas passage, a sufficient amount of fuel gas can be supplied to the gas burner via the main gas passage and the plurality of auxiliary gas passages when the igniter is energized . Further, when the gas burner is ignited, the energization timing to the first and second self-holding solenoid valves and the energization timing to the igniter do not overlap, so the burden on the power source can be reduced. Further, according to the gas combustion apparatus, when the gas burner is extinguished, after the energization holding solenoid valve is closed, the first and second self-holding solenoid valves are controlled so as to be closed. The next combustion operation is started from the closed state of any self-holding solenoid valve. Therefore, control is performed so that both self-holding solenoid valves are held open when at least one of the self-holding solenoid valves ends in the previous combustion operation or at the end of the previous combustion operation. Compared to the case where the gas burner is ignited, the fuel gas supplied to the gas burner can be reliably reduced from when the gas burner is ignited. In particular, in consideration of the burden on the power source, when the energization timing to the first and second self-holding solenoid valves is asynchronous when the gas burner is ignited, even if one of the self-holding solenoid valves is held open, Since the other self-holding solenoid valve is held closed, the fuel gas supplied to the gas burner is more reliably supplied before the gas burner is ignited than when both self-holding solenoid valves are open. Can be reduced. Further, when the gas burner is extinguished, the energization timing to the energization holding solenoid valve and the energization timing to the first and second self-holding solenoid valves do not overlap, so the burden on the power source can be reduced.

As described above, according to the present invention, when the gas burner is ignited, after the energization holding solenoid valve is opened, the first self-holding solenoid valve is held open , and the first self-holding solenoid valve is further opened. after There is the open-valve state hold, since control to so that to energize the igniter, after the fuel gas from only the sub gas passage to the gas burner is supplied, at the time of energization of the igniter via a main gas passage and gas sub-passageway A sufficient amount of fuel gas can be supplied to the gas burner, and the gas burner can be ignited smoothly. Further, according to the present invention, when the gas burner is extinguished , the first self-holding electromagnetic valve is controlled to be closed after the energization holding electromagnetic valve is closed. The next combustion operation is started from the valve closed state. Therefore, it is possible to reliably reduce the fuel gas supplied to the gas burner between the ignition operation by the user and the ignition of the gas burner. Moreover, the burden on the power source when the gas burner is ignited and extinguished can be reduced.

  Further, in a gas combustion apparatus provided with a communication device that communicates an operation signal for operating an external device, after the operation signal is transmitted from the communication device to the external device when the gas burner is ignited, the first self-holding solenoid valve Therefore, the leakage of unburned gas can be effectively suppressed while reducing the load on the power source.

Further, in the gas combustion apparatus having a plurality of auxiliary gas passages and provided with the second self-holding electromagnetic valve in at least one auxiliary gas passage, the energization holding electromagnetic valve is opened when the gas burner is ignited . after the first and second self-holding type solenoid valves either to the open-valve state hold further after the first and second self-holding type solenoid valve is opened retained, since controlled to so that to energize the igniter After the fuel gas is supplied from only the auxiliary gas passage to the gas burner, a sufficient amount of fuel gas can be supplied to the gas burner when the igniter is energized, and the gas burner can be ignited smoothly. In addition, since the first and second self-holding solenoid valves are controlled so that both the first and second self-holding solenoid valves are closed after the energization holding solenoid valve is closed when the gas burner is extinguished, the first and second self-holding types All the solenoid valves start the next combustion operation from the closed state. Therefore, it is possible to reliably reduce the fuel gas supplied to the gas burner between the ignition operation by the user when starting the next combustion operation and the ignition of the gas burner. And even when the energization timing to the first and second self-holding solenoid valves is asynchronous, leakage of unburned gas can be suppressed. Moreover, the burden on the power source when the gas burner is ignited and extinguished can be reduced.

  Therefore, according to the present invention, it is possible to provide a gas combustion apparatus in which leakage of unburned gas until the gas burner is ignited is reliably suppressed and gas odor is reduced while preventing ignition failure during ignition of the gas burner. Can do.

FIG. 1 is a circuit diagram showing an example of a gas combustion apparatus according to an embodiment of the present invention. FIG. 2 is a time chart showing an example of operation in the gas combustion apparatus according to the embodiment of the present invention.

Hereinafter, the gas combustion apparatus according to the present embodiment will be specifically described with reference to the drawings.
FIG. 1 is a circuit diagram of a gas stove that is an example of the gas combustion apparatus of the present embodiment. 1 is a gas burner, 2 is a main gas passage connected to the gas burner 1, 3 and 4 are auxiliary gas passages connected in parallel to the main gas passage 2, and 12 is a control unit for controlling the operation of the gas stove. It is. The gas stove is provided with a ventilation fan 40 as an external device that operates in conjunction with the point fire extinguishing of the gas burner 1.

  A temperature detector 5 for detecting the temperature of the food A (including the cooking container) placed on the gas burner 1 is provided at the center of the gas burner 1, and the gas burner 1 is located near the gas burner 1. An ignition electrode 6 is provided for performing ignition. The main gas passage 2 is provided with a main solenoid valve 7 as an electromagnetic safety valve and a switching solenoid valve 8 as a first self-holding solenoid valve in order from the upstream side. Further, the auxiliary gas passages 3 and 4 have their upstream end portions branched from the main gas passage 2 between the electromagnetic valves 7 and 8, and the downstream end portions thereof are connected to the main gas passage 2 on the downstream side of the switching electromagnetic valve 8. Have been joined. Further, similarly to the main gas passage 2, the auxiliary gas passage 3 is provided with a switching solenoid valve 9 that is a second self-holding solenoid valve.

  The main solenoid valve 7 is a current-carrying solenoid valve, and is attached with a spring 11 by igniting (pushing) a point fire switch 10 (push switch) provided in a gas stove casing (not shown). The valve is opened against the force, and the main solenoid valve 7 is kept open even if the ignition operation of the point-extinguishing switch 10 is canceled by continuously energizing the main solenoid valve 7 in this state. It has become. In addition, by performing a fire extinguishing operation (pushing operation) on the point fire extinguishing switch 10, the energization of the main electromagnetic valve 7 is interrupted, and the main electromagnetic valve 7 is closed by the biasing force of the spring 11.

  The switching solenoid valves 8 and 9 are latch valves having the same configuration, and operate in an opening direction or a closing direction by temporarily energizing the switching solenoid valves 8 and 9 (for example, a current of 80 mA flows for 130 ms). Thus, the open / closed state is switched from closed to open, or from open to closed, and thereafter the open / closed state is maintained by the magnetic force of the magnet or the like.

  The control unit 12 includes a microcomputer (hereinafter referred to as a microcomputer) 15 and a main solenoid valve drive circuit 16 and a switch solenoid valve drive circuit 17 that energize and drive the main solenoid valve 7 and the switching solenoid valves 8 and 9 according to instructions from the microcomputer 15. An igniter drive circuit 18 for energizing and driving an igniter 19 that generates spark discharge at the ignition electrode 6 according to an instruction from the microcomputer 15, a power supply circuit 20 for supplying power to the microcomputer 15 from the battery 21 that is a power source of the gas stove, and various notifications Display lamps (notification devices) 24a to 24c that are energized in accordance with instructions from the microcomputer 15, and an infrared LED drive circuit that energizes and drives an infrared LED 30 for transmitting an infrared signal as an operation signal to the ventilation fan 40. 27. In addition, the gas stove includes an operating device 22 for the user to instruct the microcomputer 15 to perform temperature control to keep the heating temperature of the food A at a certain constant temperature. Note that the switching solenoid valves 8 and 9 may be each energized and driven by an independent switching solenoid valve drive circuit, and the infrared LED drive circuit 27 may be controlled by a microcomputer different from the microcomputer 15.

  The power supply circuit 20 is connected to the battery 21 and to the micro switch 26. The ignition switch 10 is ignited, and the micro switch 26 is closed by a heart cam mechanism (not shown), and a closing signal is transmitted. Then, a holding signal for holding power supply is sent from the microcomputer 15 to the power supply circuit 20, and the microcomputer 15, the main solenoid valve drive circuit 16, the switching solenoid valve drive circuit 17, the igniter drive circuit 18, the display drive circuit 23, the infrared LED Power supply to the drive circuit 27 and the like is started. Further, when the micro switch 26 is opened by the fire extinguishing operation of the point fire extinguishing switch 10 and an opening signal is sent, the power supply circuit is supplied from the microcomputer 15 until the switching electromagnetic valves 8 and 9 are held closed as will be described later. The holding signal for holding the power supply to 20 is continuously sent, and then the power supply is cut off. The drive circuits 16, 17, 18, 23, and 27 receive power from the power supply circuit 20 and are respectively instructed by the microcomputer 15 according to instructions from the main solenoid valve 7, the switching solenoid valves 8 and 9, the igniter 19, and the display. The lamps 24a to 24c and the infrared LED 30 are energized to operate them. The power supply circuit 20 is connected to a battery voltage monitoring circuit (not shown). When a closing signal is sent from the micro switch 26, the battery voltage is monitored, and when the battery voltage falls below a predetermined voltage. A signal indicating that is output to the microcomputer 15.

  Each of the display lamps 24a to 24c is turned on to notify, for example, that the gas burner 1 is in the combustion operation, notify that the temperature control is being performed, notify the necessity of replacement of the battery 21, and the like.

  The microcomputer 15 is supplied with power from the battery 21 via the power supply circuit 20, and based on an instruction from the operation unit 22, a detection signal from the temperature detector 5, and the like, the igniter drive circuit 18, the main solenoid valve drive circuit 16, and the switching electromagnetic The valve drive circuit 17, the display drive circuit 23, and the infrared LED drive circuit 27 are controlled to control the operation of the gas stove such as the ignition control and temperature control of the gas burner 1 and the operation of the ventilation fan 40. Although not shown, the ventilation fan 40 is provided with a receiving device for receiving the infrared signal transmitted from the infrared LED 30. When the receiving device receives the infrared signal, the ventilation fan 40 starts and stops rotating. Is called. Note that communication between the gas combustion device and the external device may be performed by wire.

  Next, the operation of the gas stove according to the present embodiment will be described. As shown in FIG. 2, when the user operates the ignition switch 10 to start the combustion operation, the main electromagnetic valve 7 is opened against the urging force of the spring 11 and the micro switch 26 A closing signal is sent to the microcomputer 15 and the power supply circuit 20, and power is supplied from the battery 21 to the microcomputer 15 or the like via the power supply circuit 20 to start the microcomputer 15 or the like. In this state, an initial check of a solenoid valve check and a voltage check (not shown) is performed. If the battery voltage is equal to or higher than a predetermined voltage, the main solenoid valve 7 is energized continuously by the main solenoid valve drive circuit 16, and the user Until the point fire extinguishing switch 10 is extinguished, the main solenoid valve 7 is held open. At this time, as will be described later, in the previous combustion operation, when the gas burner 1 is extinguished, both the switching solenoid valves 8 and 9 are held closed, so that the ignition operation is performed and the main solenoid valve 7 is opened. Even so, the fuel gas is supplied to the gas burner 1 only from the auxiliary gas passage 4.

  When the main electromagnetic valve 7 is opened, the microcomputer 15 similarly performs an initial check of an electromagnetic valve check and a voltage check (not shown). If the battery voltage is equal to or higher than a predetermined voltage, an infrared signal is sent from the infrared LED 30 to the ventilation fan 40. Is transmitted temporarily by the infrared LED drive circuit 27 (for example, 200 ms), and the infrared LED 30 is energized and driven. Thereby, the operation of the ventilation fan 40 is started.

  Next, the switching solenoid valves 9 and 8 are temporarily energized (for example, 130 ms) by the switching solenoid valve drive circuit 17 so that the switching solenoid valves 9 and 8 are sequentially held open. As a result, the switching solenoid valves 9 and 8 both operate in the opening direction, and the fuel gas is supplied to the gas burner 1 not only through the auxiliary gas passage 4 but also through the main gas passage 2 and the auxiliary gas passage 3.

  After the switching electromagnetic valves 8 and 9 are held open as described above, subsequently, as shown in FIG. 2, the igniter drive circuit 18 energizes the igniter 19 for a certain time (for example, 3 seconds), The igniter 19 causes a spark discharge in the ignition electrode 6.

  Thereby, the gas burner 1 is ignited while the fuel gas is supplied to the gas burner 1 from all the gas passages of the main gas passage 2 and the sub gas passages 3 and 4. Thus, since both the switching solenoid valves 8 and 9 are held open before the igniter 19 is energized, the gas burner 1 is sufficiently free from all the gas passages of the main gas passage 2 and the auxiliary gas passages 3 and 4. A sufficient amount of fuel gas is supplied, and the gas burner 1 is smoothly ignited. In addition, since the energization timing to the infrared LED 30, the energization timing to the switching solenoid valves 8 and 9 that are self-holding solenoid valves, and the energization timing to the igniter 19 do not overlap (be out of sync), The burden is not so large, and the burden is reduced.

  When the gas burner 1 is normally ignited, the display drive circuit 23 energizes the display lamp 24a to light it, and notifies that the combustion operation of the gas burner 1 is being performed.

  Next, for example, after the gas burner 1 is ignited, when the user instructs the microcomputer 15 to perform temperature control using the operating device 22, the microcomputer 15 energizes the display lamp 24b by the display drive circuit 23. This is turned on to notify that the temperature control mode is in effect. And the microcomputer 15 is based on the heating temperature of the food A obtained by the temperature detector 5, for example, the heating temperature is set to a predetermined temperature or a temperature set by the user (hereinafter referred to as temperature control temperature). The switching solenoid valves 8 and 9 are energized by the switching solenoid valve drive circuit 17 so that the switching solenoid valves 8 and 9 are opened and closed.

  That is, when the heating temperature of the food A obtained by the temperature detector 5 becomes higher than the temperature control temperature, the microcomputer 15 closes either or both of the switching solenoid valves 8 and 9 by the switching solenoid valve drive circuit 17. Energization for setting the valve state is performed, and either or both of the switching solenoid valves 8 and 9 are closed. For example, as shown in FIG. 2, if the switching electromagnetic valve 9 is energized and closed, medium gas is supplied to the gas burner 1 only from the main gas passage 2 and the sub gas passage 4. The fire power of the gas burner 1 is medium fire. Further, after closing the switching solenoid valve 9, if the switching solenoid valve 8 is further energized and both are closed, a small amount of fuel gas is supplied to the gas burner 1 only from the auxiliary gas passage 4, The thermal power of the gas burner 1 is low.

  On the other hand, when the heating temperature of the cooked food A obtained by the temperature detector 5 becomes lower than the temperature adjustment temperature, the microcomputer 15 opens one or both of the switching solenoid valves 8 and 9 by the switching solenoid valve drive circuit 17. Energization for making the valve state is performed, one or both of the switching solenoid valves 8 and 9 are opened, and the heating power of the gas burner 1 is set to medium or strong, contrary to the above. Thereby, the thermal power of the gas burner 1 is adjusted so that the temperature of the cooked item A is maintained at the temperature control temperature.

  Next, when the user performs a fire extinguishing operation on the point fire extinguishing switch 10 in order to end the combustion operation, an opening signal is sent from the micro switch 26 to the microcomputer 15 and the power supply circuit 20. Then, the microcomputer 15 continues to send the holding signal for holding the power supply to the power supply circuit 20 and cuts off the energization to the main solenoid valve drive circuit 16. As a result, the main electromagnetic valve 7 is closed, the supply of fuel gas to the gas burner 1 is stopped, and the gas burner 1 is extinguished.

  When the main electromagnetic valve 7 is closed, the microcomputer 15 energizes the infrared LED 30 temporarily (for example, 200 ms) by the infrared LED drive circuit 27 in the same manner as described above in order to transmit an infrared signal from the infrared LED 30 to the ventilation fan 40. The infrared LED 30 is energized and driven. Thereby, the operation of the ventilation fan 40 is stopped.

  Next, since the power supply to the microcomputer 15 is continued, the open / close state of the switching electromagnetic valves 8 and 9 is confirmed. If both the switching electromagnetic valves 8 and 9 are in the open state, the switching electromagnetic valve 8 and the switching electromagnetic valve The switching solenoid valves drive circuit 17 temporarily energizes the switching solenoid valves 8 and 9 (for example, 130 ms) so that the valves 9 are sequentially held closed. Thereby, the switching electromagnetic valves 8 and 9 in the valve open state operate in the closing direction, and the main gas passage 2 and the sub gas passage 3 are blocked. Thus, even when the gas burner 1 is extinguished, the battery 21 is controlled so that the energization timing to the infrared LED 30 and the energization timing to the switching solenoid valves 8 and 9 do not overlap (asynchronously). The burden of is not so large, and the burden is reduced. In addition, as shown in FIG. 2, if only one of the switching electromagnetic valves 8 and 9 is in the open state, only the one in the open state is energized. Further, if both switching electromagnetic valves 8 and 9 are closed, the combustion operation is terminated without energization. Thereby, the burden of a power supply can be reduced more.

  As described above, when temperature control is performed and the user operates the fire extinguishing switch 10 during or after the adjustment of the heating power of the gas burner 1, the switching solenoid valves 8 and 9 are opened and closed. There can be either a state or a closed state. When the power supply to the microcomputer 15 is interrupted by the fire extinguishing operation, the microcomputer 15 cannot recognize the open / closed state of the switching electromagnetic valves 8 and 9.

  However, according to the present embodiment, when the user performs the ignition operation of the fire extinguishing switch 10, the microcomputer 15 is activated and outputs a valve opening command signal for the switching solenoid valves 8 and 9 to the switching solenoid valve drive circuit 17. Since these are operated in the opening direction, the switching solenoid valves 8 and 9 are reliably held open when the gas burner 1 is ignited regardless of the open / close state of the switching solenoid valves 8 and 9. As a result, a sufficient amount of fuel gas is supplied to the gas burner 1 through all the gas passages, so that the gas burner 1 can be ignited smoothly.

  Further, according to the present embodiment, when the user extinguishes the fire extinguishing switch 10, the energization to the main electromagnetic valve 7 is cut off, the supply of fuel gas to the gas burner 1 is stopped, and the gas burner 1 is extinguished. However, power supply from the power supply circuit 20 to the microcomputer 15 and the like is maintained, the open / close state of the switching solenoid valves 8 and 9 is confirmed, and a valve closing command signal is sent to the switching solenoid valve drive circuit 17 for those in the valve opening state. Therefore, the switching solenoid valves 8 and 9 are reliably held closed. Therefore, in the next combustion operation, the combustion operation is restarted from the closed state of both the switching solenoid valves 8 and 9. Therefore, after the ignition operation is performed, even if another electronic device is operated or an initial check such as a voltage check is performed, the auxiliary gas valves 8 and 9 are kept open until the switching electromagnetic valves 8 and 9 are held open. A small amount of fuel gas is supplied to the gas burner 1 only through the passage 4.

  On the other hand, when the heating power is adjusted during the previous combustion operation and at least one of the switching solenoid valves 8 and 9 is in the open state during the fire extinguishing operation, as in the past, in the next combustion operation, From the ignition operation until the gas burner 1 is ignited, the fuel gas is supplied to the gas burner 1 through the main gas passage 2 and / or the auxiliary gas passage 3 in addition to the auxiliary gas passage 4. When the switching solenoid valves 8 and 9 are controlled to be kept open at the end of the combustion operation, the gas burner 1 is passed through the main gas passage 2 and all the gas passages of the sub gas passages 3 and 4 in the next combustion operation. Is supplied with fuel gas. Therefore, in these cases, leakage of unburned gas increases, but according to the present embodiment, the igniter 19 is driven and the gas burner 1 is ignited after the ignition operation is performed, compared to any of the above. Until then, the fuel gas supplied to the gas burner 1 can be reliably reduced.

  Further, in the present embodiment, after the ignition operation is performed and before the igniter 19 is driven, not only the switching electromagnetic valves 8 and 9 but also the infrared LED 30 are operated, and the burden on the battery 21 is taken into consideration. Since the energization timings of these electronic devices are asynchronous, the time from when the ignition operation is performed until the igniter 19 is driven and the gas burner 1 is ignited becomes longer.

  However, according to the present embodiment, in the previous combustion operation, the switching solenoid valves 8 and 9 are controlled to be closed when the gas burner 1 is extinguished, and the switching solenoid valve is controlled when the gas burner 1 is ignited. Since the infrared LED 30 is operated before 8 and 9, the fuel gas is supplied to the gas burner 1 only through the auxiliary gas passage 4 during the time in which the infrared LED 30 is energized. Further, since the switching solenoid valves 8 and 9 are sequentially held open, while the switching solenoid valve 9 is energized, the other switching solenoid valve 8 is held closed. Yes. Therefore, the fuel gas is supplied to the gas burner 1 only through the auxiliary gas passages 3 and 4 until the switching electromagnetic valve 8 is held open. As described above, according to the present embodiment, when the gas burner 1 is ignited, even if the energization timing of each electronic device is controlled to be asynchronous, the ignition operation is performed until the gas burner 1 is ignited. The fuel gas supplied during the period can be reduced. Thereby, the leakage of unburned gas at the time of ignition of the gas burner 1 can be reduced, and a gas combustion apparatus with reduced gas odor can be provided.

(Other embodiments)
(1) In the above embodiment, when the gas burner is extinguished, the open / close state of the self-holding solenoid valve is confirmed, and when the self-holding solenoid valve is open, the self-holding solenoid valve is operated in the closing direction. The self-holding solenoid valve is closed and held, but regardless of whether the self-holding solenoid valve is open or closed, the self-holding solenoid valve is energized to operate the self-holding solenoid valve in the closing direction. Thus, the self-holding electromagnetic valve may be controlled to be closed. Thereby, when the gas burner is extinguished, the self-holding electromagnetic valve can be held closed more reliably.

(2) In the above embodiment, the case where the self-holding solenoid valve is held closed when the gas burner is extinguished by the user's extinguishing operation has been described. However, it is detected by a temperature detector during ignition failure or during combustion operation. Even when the gas burner is extinguished based on the temperature, similarly, the first and second self-holding solenoid valves may be held closed when the gas burner is extinguished.

1 Gas burner 2 Main gas passage 3, 4 Sub gas passage 8 Switching solenoid valve (first self-holding solenoid valve)
9 Switching solenoid valve (second self-holding solenoid valve)
12 Control unit 30 Infrared LED
40 Ventilation fan (external equipment)

Claims (4)

A main gas passage connected to the gas burner, at least one sub gas passage connected in parallel with the main gas passage, and a main gas passage are controlled to be opened and closed to adjust the heating power of the gas burner during the combustion operation of the gas burner. The first self-holding solenoid valve and the main gas passage upstream from the branch of the auxiliary gas passage, the energization holding solenoid valve for supplying and shutting off the fuel gas to the gas burner, and the combustion operation are controlled. A gas combustion device comprising a control unit,
Control unit, upon ignition of the gas burner, after opening the current holding type solenoid valve, the first self-holding type solenoid valve is opened held, after the first self-holding type solenoid valve is opened retained, and control in so that you energize the igniter,
A gas combustion apparatus that controls the first self-holding solenoid valve to be closed and held after the energization holding solenoid valve is closed when the gas burner is extinguished. The gas combustion apparatus according to claim 1, wherein
When the first self-holding solenoid valve is open when the gas burner is extinguished, the control unit operates the first self-holding solenoid valve in the closing direction to hold the first self-holding solenoid valve closed. Gas combustion device that controls to be. The gas combustion apparatus according to claim 1 or 2, further,
A communication device for transmitting an operation signal to an external device is provided.
The control unit is a gas combustion device that controls the first self-holding electromagnetic valve to be held open after transmitting an operation signal from a communication device to an external device when the gas burner is ignited. The gas combustion apparatus according to any one of claims 1 to 3,
A plurality of sub gas passages connected in parallel with the main gas passage;
A second self-holding solenoid valve provided in at least one auxiliary gas passage,
Control unit, upon ignition of the gas burner, after opening the current holding type solenoid valve, the second self-holding type solenoid valve is opened held, after the second self-holding type solenoid valve is opened retained, and control in so that you energize the igniter,
A gas combustion apparatus that controls the second self-holding solenoid valve to be closed and closed after the energization holding solenoid valve is closed when the gas burner is extinguished.

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