JPH09133356A - Gas combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the ignition failure of a gas burner by outputting the valve open command signal of a self-holding type solenoid valve to the driving circuit of the valve irrespective of the switching state of the valve in igniting the burner. SOLUTION: When a user operates to ignite an ignition and fire extinguishing button 8, a main solenoid valve 6 is opened. On the one hand, a microswitch 17 is closed to start a microcomputer 10. The microcomputer 10 outputs signals of low or high level to the base of the transistor of a switching solenoid valve driving circuit 12 as the valve open command signal of a switching solenoid valve 7 to conduct the transistor. If the valve 7 is in the valve open state, it holds the state as it is, while if the valve 7 is in the valve closed state, it switches the valve to the open state by energizing it. The microcomputer 10 intermittently outputs the valve open signal several times even if the valve 7 is not transferred from the closed state to the open state by the first time valve open command signal, thereby effectively switching the valve 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas combustion apparatus such as a gas stove.

[0002]

2. Description of the Related Art In a gas stove, for example, a main gas passage and a sub gas passage are connected in parallel to a gas burner, and a solenoid valve is provided in the main gas passage to heat a cooking temperature of a cooking product by a combustion operation of the gas burner. It is known to control the opening / closing of the solenoid valve by a microcomputer in accordance with the above conditions to adjust the heating power of the gas burner. In this case, when the solenoid valve is opened, the combustion gas is supplied to the gas burner from both the main gas passage and the sub gas passage, and the thermal power of the gas burner becomes strong.When the solenoid valve is closed, only the sub gas passage is provided in the gas burner. A small amount of fuel gas is supplied from the gas burner, and the heating power of the gas burner becomes low.

By the way, the solenoid valve of this type of gas stove is generally of the energization-holding type, and the energization-holding type solenoid valve is kept open by continuously passing an energizing current to the energizing type. By shutting off the current, the valve is closed by the urging force of a spring or the like. However, the energization-holding type solenoid valve is required to continuously pass the energizing current in order to hold the valve open, which is disadvantageous in terms of power saving of the device. When a battery is used as a power source for the battery, it is disadvantageous in minimizing the consumption of the battery.

Therefore, it is conceivable to use a self-holding solenoid valve as the solenoid valve for adjusting the heating power of the gas burner. This self-holding type solenoid valve is held in the open state or the closed state by the magnetic force of the magnet or the like by simply energizing the valve temporarily when switching between opening and closing. Power consumption can be reduced by using the self-holding solenoid valve.

However, when the self-holding solenoid valve as described above is used as a solenoid valve for adjusting the heating power of the gas burner, the inventors of the present application have found that the following disadvantages occur. That is, the self-holding solenoid valve is held in either a valve open state or a valve closed state unless a temporary energizing current is passed through it as described above. Therefore, while the microcomputer controls the opening / closing of the self-holding solenoid valve to adjust the heat power of the gas burner, or after that, the user extinguishes the fire or the microcomputer controls the auxiliary gas passage. When the main valve provided in the main gas passage on the upstream side is closed and the combustion operation of the gas burner is interrupted or stopped, the state of the self-holding solenoid valve is when the heat power of the gas burner is adjusted. The valve is held in the above state and may be in the valve open state or the valve closed state.

In this case, the microcomputer can recognize the open / closed state of the self-holding solenoid valve controlled by itself as long as the microcomputer is operated by being supplied with power. However, for example, in the case of using a battery as a power source, when the combustion operation of the gas burner is stopped, the power supply to the microcomputer may be stopped in order to suppress the consumption of the battery, and the commercial power supply etc. is used. However, even in the case of a power supply, the power supply to the microcomputer will be stopped at the time of a power failure. After the power supply to the microcomputer is stopped in this way, even if the power supply to the microcomputer is started when the gas burner is reignited, the current open / closed state of the self-holding solenoid valve is recognized at that time. Can not do.

However, at the time of ignition of such a gas burner, the self-holding solenoid valve may be in the closed state as described above. In this case, the microcomputer causes the self-holding solenoid valve to operate. When the drive control of the sparker is performed to ignite the gas burner without recognizing the open / closed state, only a small amount of fuel gas is supplied to the gas burner from only the sub gas passage, so that the gas burner is smoothly ignited. Could be difficult.

[0008]

In view of such a background, the present invention adopts a self-holding type solenoid valve as a solenoid valve for adjusting the heating power of a gas burner to reduce the power consumption of equipment, and An object of the present invention is to provide a gas combustion device capable of reliably preventing a situation where ignition of a gas burner is performed in a valve closed state and ignition failure occurs.

[0009]

In order to achieve the above object, the first aspect of the present invention is directed to a main gas passage connected to a gas burner and a sub gas passage connected to the gas burner in parallel with the main gas passage. A gas combustion apparatus comprising a gas passage, an electromagnetic valve provided in the main gas passage, and a microcomputer for controlling opening and closing of the electromagnetic valve to adjust the thermal power of the gas burner during combustion operation of the gas burner, The solenoid valve is a self-holding solenoid valve, the solenoid valve is a self-holding solenoid valve, and the self-holding solenoid valve is opened regardless of the open / closed state of the self-holding solenoid valve when the gas burner is ignited. It is characterized in that it is provided with ignition-time valve opening command output means for outputting a valve command signal to a drive circuit of the self-holding solenoid valve.

According to the first aspect of the present invention, the opening / closing control of the self-holding solenoid valve by the microcomputer for adjusting the heating power of the gas burner is performed by switching the opening / closing of the self-holding solenoid valve. The opening / closing control is performed with little power consumption because it is performed only by temporarily energizing only for some time. Then, after the open / close control of the self-holding solenoid valve is performed, the combustion operation of the gas burner is once terminated, and when the ignition of the gas burner is newly performed, the open / closed state of the self-holding solenoid valve is In either case, the ignition valve opening command output means may be in the open state or the closed state, regardless of whether the self-holding solenoid valve is open or closed. Since the valve opening command signal for the solenoid valve is output to the drive circuit for the solenoid valve, the self-holding solenoid valve is always opened. Therefore, at the time of ignition of the gas burner, even if the microcomputer does not recognize the open / closed state of the self-holding solenoid valve immediately before that, the self-holding solenoid valve is always opened and the main gas passage and the auxiliary gas A sufficient amount of fuel gas is supplied to the gas burner from both the passage and the gas burner, so that the gas burner can be ignited smoothly.

Therefore, according to the first aspect of the present invention, the self-holding type solenoid valve is adopted as the solenoid valve for adjusting the heating power of the gas burner to save the power of the equipment and to close the solenoid valve. It is possible to reliably prevent a situation in which the gas burner is ignited in the valve state and an ignition failure occurs. Next, a second aspect of the present invention, in order to achieve the above object, a main gas passage connected to a gas burner, an auxiliary gas passage connected to the gas burner in parallel with the main gas passage, and In a gas combustion apparatus equipped with a solenoid valve provided in a main gas passage and a microcomputer for controlling the opening and closing of the solenoid valve to adjust the thermal power of the gas burner during combustion operation of the gas burner, the solenoid valve is self-holding type. An electrically writable and erasable non-volatile memory configured by a solenoid valve for storing and holding the open / closed state of the self-holding solenoid valve at the end of the combustion operation of the gas burner according to an instruction of the microcomputer; When the content of the open / closed state of the self-holding solenoid valve stored and held in the nonvolatile memory at the time of ignition is closed, the self-holding solenoid valve is opened. The command signal is characterized in that a spark during valve-opening command output means for outputting to the driving circuit of the self-holding type solenoid valves.

According to the second aspect of the present invention, as in the first aspect, the opening / closing control of the self-holding solenoid valve by the microcomputer for adjusting the thermal power of the gas burner consumes a small amount. It is done with electricity. Then, after the open / close control of the self-holding solenoid valve is performed, the combustion operation of the gas burner is once terminated, and when the ignition of the gas burner is newly performed, the open / closed state of the self-holding solenoid valve is Although it may be in the valve open state or the valve closed state, the nonvolatile memory stores and holds the open / closed state of the self-holding solenoid valve at the end of the gas burner according to an instruction from the microcomputer. Therefore, according to the contents stored and held in the nonvolatile memory,
It is possible to recognize the open / closed state of the self-holding solenoid valve when the gas burner is newly ignited. Then, when the open / closed state of the self-holding solenoid valve recognized by the content stored and held in the non-volatile memory is the closed state, the ignition time valve opening command output means opens the self-holding solenoid valve. A valve command signal is output to the drive circuit of the solenoid valve, whereby the self-holding solenoid valve is switched to the open state. In this case, if it is recognized that the self-holding solenoid valve is already in the open state based on the contents stored and held in the non-volatile memory, the ignition-time valve opening command output means outputs the self-holding solenoid valve The self-holding solenoid valve is held in its open state without outputting the valve open command signal. As a result, when the gas burner is ignited, the self-holding solenoid valve is opened,
A sufficient amount of fuel gas is supplied to the gas burner from both the main gas passage and the sub gas passage, so that the gas burner can be ignited smoothly.

Since the non-volatile memory only consumes electric power when writing or reading the stored contents, the non-volatile memory consumes electric power when the gas burner is not in the combustion operation. There is no such thing. Therefore, according to the second aspect of the present invention, as in the case of the first aspect, the self-holding type solenoid valve is adopted as the solenoid valve for adjusting the heat power of the gas burner, while power saving of the device is achieved. It is possible to reliably prevent a situation in which the gas burner is ignited while the electromagnetic valve is in the closed state, resulting in ignition failure. Moreover, only when the self-holding solenoid valve is closed when the gas burner is ignited, the ignition-time open command output means energizes the self-holding solenoid valve to open the self-holding solenoid valve. Since the valve is in the valve state, energization of the self-holding solenoid valve can be suppressed to a necessary limit, and further power saving can be achieved.

In the first and second aspects of the present invention, the ignition-time valve opening command output means intermittently outputs the valve-opening command signal a plurality of times during ignition of the gas burner. It is preferable to carry out. According to this, even if the self-holding solenoid valve does not switch from the closed state to the open state by outputting the valve opening command signal only once for some reason, the multiple times With the valve opening command signal, the self-holding solenoid valve can be opened as reliably as possible, and the gas burner can be reliably and smoothly ignited.

The present invention is also directed to gas combustion in which the microcomputer uses a battery as a power source, the battery power source is activated when the gas burner is ignited, and the battery power source is cut off when the gas burner is extinguished. It is particularly suitable to be applied to a device. That is, when the battery power supply to the microcomputer is shut off when the gas burner is extinguished, it suppresses excessive battery consumption, but the microcomputer recognizes the open / closed state of the self-holding solenoid valve. You will not be able to do so. However, in the first aspect of the present invention, when the gas burner is ignited, the ignition valve opening command output means outputs the valve opening command of the self-holding electromagnetic valve regardless of the open / close state of the self-holding electromagnetic valve. Since the signal is output, the self-holding solenoid valve can be opened without any trouble. Further, in the second aspect of the present invention, since the open / closed state of the self-holding solenoid valve is stored and held in the non-volatile memory even when the battery power is cut off,
When the gas burner is ignited, it is possible to recognize the open / closed state of the self-holding solenoid valve based on the stored contents of the non-volatile memory. Therefore, when the self-holding solenoid valve is in the closed state, the ignition-time open valve is opened. The command output means can output a valve opening command signal to bring the self-holding electromagnetic valve into an open state.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the first aspect of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of the gas combustion apparatus of the present embodiment, and FIG. 2 is a circuit configuration diagram of a main part of FIG. Referring to FIG. 1, the gas combustion apparatus of the present embodiment is, for example, a gas stove, 1 is a gas burner, 2 is a main gas passage connected to the gas burner 1, and 3 is a sub gas connected in parallel to the main gas passage 2. It is a passage.

At the center of the gas burner 1, there is provided a temperature detector 4 for detecting the temperature of the food A (including the cooking container) placed on the gas burner 1, and the gas burner 1 is also provided.
An ignition electrode 5 for igniting the gas burner 1 is provided in the vicinity of. The main gas passage 2 is provided with a main solenoid valve 6 and a switching solenoid valve 7 in order from the upstream side thereof.
The upstream end of the sub gas passage 3 is branched from the main gas passage 2 between the solenoid valves 6 and 7, and the downstream end is joined to the main gas passage 2 on the downstream side of the switching solenoid valve 7. .

In this case, the main solenoid valve 6 is an energization-holding type solenoid valve, and performs an ignition operation (push operation) on an ignition / extinguishing button 8 (push button) provided on the housing (not shown) of the gas stove. As a result, the valve is opened against the biasing force of the spring 9 and, even if the ignition operation of the ignition / extinguishing button 8 is canceled by continuously energizing the main solenoid valve 6 in this state, the main solenoid valve 6 is released. The valve 6 is held open. The main solenoid valve 6 is closed by the urging force of the spring 9 by cutting off the power supply to the main solenoid valve 6 by the switch 17.

The switching solenoid valve 7 is a well-known self-holding solenoid valve corresponding to the configuration of the present invention, and is temporarily energized (for example, energizing current of 80 mA is applied for about 100 ms) to open and close the solenoid valve. After switching from open to closed or from closed to open, the open / closed state is maintained by the magnetic force of the magnet or the like. Note that, with reference to FIG. 2, the switching solenoid valve 7 which is the self-holding solenoid valve of the present embodiment.
Is a so-called two-wire type having two current-carrying wires 7a and 7b. When switching the open / closed state from open to closed,
For example, when a current is passed through the switching solenoid valve 7 from the energizing line 7a side to the energizing line 7b side to switch from closed to open as indicated by arrow X in FIG. Then, a current is passed through the switching solenoid valve 7 from the energizing line 7b side toward the energizing line 7a side.

Further, in FIG. 1, 10 is a microcomputer (hereinafter referred to as a microcomputer) for controlling the operation of the gas stove, 11 and 12 are main solenoids for energizing the main solenoid valve 6 and the switching solenoid valve 7 according to instructions from the microcomputer 10. A valve drive circuit and a switching electromagnetic valve drive circuit, 13 is a sparker circuit including a sparker (not shown) that causes a spark discharge in the ignition electrode 5 according to an instruction from the microcomputer 10, and 14 supplies power to the microcomputer 10 and the electromagnetic valve drive circuits 11 and 12. Power supply circuit, 15
Is an operating device for the user to instruct the microcomputer 10 to perform temperature control such that the heating temperature of the food A is maintained at a certain temperature.

The power supply circuit 14 is connected to the battery 16 which is the power source of the gas stove of this embodiment through a micro switch 17 which is closed by a heart cam mechanism (not shown) by the ignition operation of the ignition / extinguishing button 8. Power is supplied to the microcomputer 10 and the like when the micro switch 17 is closed. In addition, the micro switch 17 is an ignition / extinguishing button 8
It is opened by the fire extinguishing operation, and at this time, the power supply to the microcomputer 10 and the like is cut off.

The microcomputer 10 operates from the battery 16 to the power supply circuit 1
In the state in which power is supplied via 4, the sparker circuit 13 based on an instruction from the operation device 15 and a detection signal of the temperature detector 4
The main solenoid valve drive circuit 11 and the switching solenoid valve drive circuit 12 are controlled to control the ignition of the gas burner 1 and the temperature control. The details of this control will be described later. Further, the microcomputer 10 corresponds to the first configuration of the present invention and has a function as an ignition valve opening command output means as described later.

The switching solenoid valve drive circuit 12 is constructed by using, for example, four switching transistors (switch elements) 18 to 21 as shown in FIG. in this case,
A set of transistors 18 and 19 and transistors 20 and 2
One set is connected in series, and these two sets of series circuits are connected in parallel between the power feeding part 22 and the grounding part 23 which are fed from the power supply circuit 14. The energization line 7a of the switching solenoid valve 7 is connected to the midpoint of the series circuit of the set of transistors 18 and 19, and the energization line 7b is connected to the midpoint of the series circuit of the set of transistors 20 and 21. . The bases of the transistors 18 to 21 are connected to the microcomputer 10.

In the switching solenoid valve driving circuit 12, the switching transistors 7 and 21 are electrically connected to the switching solenoid valve 7 by applying low-level and high-level signals to the bases of the transistors 18 and 21, respectively. A current flows as shown by an arrow X, and the switching solenoid valve 7 is closed. Then, by applying high-level and low-level signals to the bases of the transistors 19 and 20, respectively,
The transistors 19 and 20 are turned on, a current flows through the switching solenoid valve 7 as shown by an arrow Y, and the switching solenoid valve 7 is opened.

Next, the operation of the gas stove of this embodiment will be described. When a user ignites the ignition / extinguishing button 8, the main solenoid valve 6 is opened, while the microswitch 1
7 is closed, power is supplied to the microcomputer 10 and the like from the battery 16 via the power supply circuit 14, and the microcomputer 10 and the like are activated. Then, the microcomputer 10 causes the main solenoid valve drive circuit 11 to energize the main solenoid valve 6 to keep the main solenoid valve 6 open. Further, the microcomputer 10 outputs a low level signal and a high level signal to the bases of the transistors 20 and 19 of the switching solenoid valve drive circuit 12 as a valve opening command signal of the switching solenoid valve 7 to make the transistors 20 and 19 conductive. .
In this case, in this embodiment, the microcomputer 10 intermittently outputs the valve opening command signal a plurality of times. Specifically, for example, the output time of the valve opening command signal per time is set to 1
It is set to 00 ms and is output three times in a cycle of 200 ms. At this time, the switching solenoid valve 7 is supplied with a current for opening the switching solenoid valve 7 for each output of the valve opening command signal as indicated by an arrow Y in FIG.
And the switching solenoid valve 7 is opened.
In this case, the open / close state of the switching solenoid valve 7 before the current is applied to the switching solenoid valve 7 may be either a valve opening state or a valve closing state as described later. The state is maintained without being changed by the energization, and when the valve is closed, the valve is opened by the energization. Further, when the switching solenoid valve 7 is in the closed state, even if the switching solenoid valve 7 is not in the open state due to some reason, even if the switching solenoid valve 7 is not in the open state for some reason, the switching solenoid valve 7 is intermittently operated a plurality of times. The switching solenoid valve 7 is surely switched to the open state by intermittently energizing the switching solenoid valve 7 according to the valve opening command signal, and thereafter the switching solenoid valve 7 is switched even if the output of the valve opening command signal is stopped. 7 is held open by its self-holding function.

As a result, gas is supplied to the gas burner 1 from both the main gas passage 2 and the sub gas passage 3. Further, the microcomputer 10 operates the sparker circuit 13 in parallel with the control as described above, and the sparker circuit 1 is activated.
A spark discharge is generated in the ignition electrode 5 by 3. As a result, the gas burner 1 is ignited and its combustion operation is started. In this case, the gas burner 1 is supplied with a sufficient amount of gas from both the main gas passage 2 and the sub gas passage 3, so that the gas burner 1 is smoothly ignited.

During the ignition and combustion operation of the gas burner 1, the microcomputer 10 monitors the combustion state of the gas burner 1 with a thermocouple (not shown) or the like.
In case of misfire or misfire of the main solenoid valve drive circuit 1
1 to shut off the power supply to the main solenoid valve 6, thereby closing the main solenoid valve 6 and extinguishing the gas burner 1.

On the other hand, in the combustion operation of the gas burner 1 as described above, when the user instructs the microcomputer 10 to perform the temperature control by the operation device 15, the microcomputer 10
On the basis of the heating temperature of the cooking product A obtained by the temperature detector 4, for example, to maintain the heating temperature at a predetermined temperature or a temperature set by the user (hereinafter referred to as a temperature-controlled temperature). The switching solenoid valve drive circuit 12
The switching solenoid valve 7 is controlled to be opened and closed via.

That is, the microcomputer 10 uses the temperature detector 4
When the heating temperature of the cooked food A obtained by the above becomes higher than the temperature control temperature, low-level and high-level signals are issued to the bases of the transistors 18, 21 of the switching solenoid valve drive circuit 12 to close the switching solenoid valve 7, respectively. It is output as a signal to turn on the transistors 18 and 21, so that FIG.
A current is passed through the switching solenoid valve 7 in the direction of arrow X to close the switching solenoid valve 7. At this time, a small amount of gas is supplied to the gas burner 1 only from the sub gas passage 3, and the heating power of the gas burner 1 becomes low.

When the heating temperature of the cooked food A becomes lower than the temperature control temperature, the microcomputer 10 switches the low level signal and the high level signal to the bases of the transistors 20 and 19 of the switching electromagnetic valve drive circuit 12, respectively. It outputs as a valve opening command signal of the valve 7 to make the transistors 20 and 19 conductive, thereby causing a current to flow through the switching solenoid valve 7 in the direction of the arrow Y in FIG. 2 to open the switching solenoid valve 7. At this time,
Gas is supplied to the gas burner 1 from both the main gas passage 2 and the sub gas passage 3, and the gas burner 1
The power of fire becomes high.

As a result, the heating power of the gas burner 1 is adjusted so that the temperature of the cooked food A is maintained at the controlled temperature. Incidentally, the output of the valve opening command signal and the valve closing command signal at the time of such temperature control is intermittently performed a plurality of times as in the case of the ignition. The switching solenoid valve 7 is opened / closed during such temperature control only by temporarily passing a current through the switching solenoid valve 7 only when switching the open / closed state of the switching solenoid valve 7, which is a self-holding solenoid valve. Since it is performed, compared to the case where a current-holding type solenoid valve was used as in the past,
The opening / closing control of the switching solenoid valve 7 can be performed with sufficiently small power consumption, and the consumption of the battery 16 can be suppressed.

Next, when the user extinguishes the ignition / extinguishing button 8 to end the combustion operation of the gas burner 1, the micro switch 17 is opened and the battery 16 is transferred from the battery 16 to the main solenoid valve drive circuit 11. Power supply to the main solenoid valve 11 is cut off, and the gas supply to the gas burner 1 is stopped.
Extinguishes.

In this case, if the user extinguishes the ignition / extinguishing button 8 during or after the temperature control as described above is being performed, the switching electromagnetic when the combustion operation of the gas burner 1 is terminated. The open / closed state of the valve 7 may be either an open state or a closed state. Then, when the combustion operation of the gas burner 1 is stopped, the power supply to the microcomputer 10 is cut off, so that the microcomputer 10 cannot recognize the open / closed state of the switching electromagnetic valve 7.

However, when the user re-ignites the ignition / extinguishing button 8 to restart the combustion operation of the gas burner 1, the microcomputer 10 is activated and the switching solenoid valve 7 is opened or closed as described above. Since the valve opening command signal of the switching solenoid valve 7 is always output to the switching solenoid valve drive circuit 12,
Even when the microcomputer 10 does not recognize the open / closed state of the switching solenoid valve 7 at the time of ignition, the switching solenoid valve 7 is reliably opened.
Therefore, the ignition of the gas burner 1 can be smoothly performed.

In this embodiment, the switching solenoid valve 7, which is a self-holding solenoid valve, is of the two-wire type, but may be of the three-wire type. That is, referring to FIG.
When a three-wire type self-holding solenoid valve is used as the switching solenoid valve 7, the switching solenoid valve 7 has three energizing wires 7c and 7c.
In order to switch the open / closed state from open to closed by having d and 7e, for example, as shown by an arrow P in the figure, a current is passed through the switching solenoid valve 7 from the energizing line 7c side toward the energizing line 7e side. , When switching from closed to open, the switching solenoid valve 7 is moved from the energizing line 7d side toward the energizing line 7e side as indicated by arrow Q.
Apply current to

In this way, the switching solenoid valve 7 is
When a line type self-holding solenoid valve is used, the switching solenoid valve drive circuit 12 is configured as shown in FIG. 3, for example, instead of the one in FIG. That is, in the switching solenoid valve drive circuit 12, the conducting wire 7e of the switching solenoid valve 7 is grounded to the grounding portion 23, and the conducting wires 7c and 7d are respectively switching transistors 24 and 25 which are switching elements.
Is connected to the power supply unit 22 via. In the switching solenoid valve drive circuit 12 thus configured, the microcomputer 10 outputs a low level signal to the base of the transistor 25 as a valve opening command signal so that the transistor 24 becomes conductive and the current indicated by the arrow Q is reached. Flows to the switching solenoid valve 7, and the switching solenoid valve 7 is opened. Further, by outputting a low-level signal as a valve closing command signal from the microcomputer 10 to the base of the transistor 24, the transistor 24 becomes conductive and a current indicated by an arrow P flows through the switching solenoid valve 7, and the switching solenoid valve 7 Is closed.

Therefore, when the gas burner 1 is ignited,
By outputting a low level signal as a valve opening command signal from the microcomputer 10 to the base of the transistor 25, the switching solenoid valve 7 is opened regardless of the opening / closing state of the switching solenoid valve 7 immediately before, and the gas burner is opened. Ignition No. 1 can be smoothly performed. In the embodiment of the first aspect of the present invention described above, the transistor is used as the switch element of the switching solenoid valve drive circuit 12, but an FET, a relay switch, or the like may be used.

Further, in the embodiment of the first aspect of the present invention, the microcomputer 10 is used as the ignition valve opening command output means, but when the gas burner 1 is ignited, it is switched from a timer circuit or the like provided separately from the microcomputer 10. A valve opening command signal may be output to the solenoid valve drive circuit 12 to put the switching solenoid valve 7 in the open state. Furthermore, the temperature control function of the microcomputer 10 is used, and at the time of ignition, a pseudo signal to the effect that the temperature control is performed is forcibly input to the microcomputer 10 from the operation unit 15 or the like, and A pseudo signal indicating that the heating temperature is lower than the controlled temperature is forcibly input from the thermistor circuit of the temperature detector 4 or the like, whereby the microcomputer 10 issues a valve opening command to the switching electromagnetic valve drive circuit 12. You may make it output a signal. Alternatively, when a signal indicating that temperature control is performed is input, the microcomputer 10 always
Once the valve opening command signal is output and a pseudo signal indicating that temperature control is to be performed at the time of ignition is input to the microcomputer 10, the switching solenoid valve drive circuit 1 is switched from the microcomputer 10.
2 may output a valve opening command signal.

Further, the power-on reset of the microcomputer 10 is performed at the time of power supply to the microcomputer 10 at the time of ignition, and when the microcomputer 10 normally starts, a signal indicating that is output from the microcomputer 10. Every other time, at the time of the power-on reset, a circuit provided separately from the microcomputer 10 outputs a valve opening command signal to the switching solenoid valve drive circuit 12 until the signal indicating the normal start-up is output from the microcomputer 10. You may do it.

Next, an embodiment of the second aspect of the present invention will be described with reference to FIG. FIG. 4 is a system configuration diagram of the gas combustion apparatus of this embodiment. The gas combustion apparatus of the present embodiment is a gas stove having the same basic configuration as the gas stove of the embodiment of the first aspect, and the same components are designated by the same reference numerals and the description thereof will be omitted.

In the gas stove of the present embodiment, EEPRO in which writing / erasing is appropriately performed by the microcomputer 10.
M (electrically writable / erasable nonvolatile memory) 26
Is provided. Then, when the microcomputer 10 outputs a valve opening command signal or a valve closing command signal to the switching electromagnetic valve drive circuit 12 at the time of ignition of the gas burner 1 or the temperature control, the microcomputer 10 outputs the command signal each time. The open / closed state of the corresponding switching solenoid valve 7 is stored and held in the EEPROM 26 (the stored content of the open / closed state is updated). Further, the microcomputer 10 appropriately, when the gas burner 1 is ignited, based on the stored contents of the EEPROM 26, as will be described later.
An open / close command signal for the switching solenoid valve 7 is output to the switching solenoid valve drive circuit 12.

The other structure is the same as that of the first embodiment. In such a gas stove, when the combustion operation of the gas burner 1 by the extinguishing operation of the ignition / extinguishing button 8 is completed, the open / close state of the switching solenoid valve 7 at that time is EEPRO.
It is stored and held in M26. In this case, the EEPROM
The open / closed state of the switching solenoid valve 7 stored and stored in 26 may be either the open state or the closed state when the temperature control is performed. And the gas burner 1
Although the microphone switch 17 is opened and the power supply to the microcomputer 10 and the like from the battery 16 is cut off by the end of the combustion operation of 1, the contents stored in the EEPROM 26 are continuously retained.

Next, when the user ignites the ignition / extinguishing button 8, the micro switch 17 is closed and the battery 16 is powered by the microcomputer 10 as in the case of the first embodiment. Is supplied to the microcomputer 10 and the microcomputer 10 is activated. At this time, the microcomputer 10 causes the main solenoid valve 6 to pass through the solenoid valve drive circuit 11 as in the case of the first embodiment.
Is held open, the open / closed state of the switching solenoid valve 7 stored and stored in the EEPROM 26 is read. Then, if the opened / closed state of the read switching solenoid valve 7 is the closed state, the microcomputer 10 causes the switching solenoid valve drive circuit 1 to operate.
2 outputs a valve opening command signal for the switching solenoid valve 7. The output of the valve opening command signal is the same as in the embodiment of the first aspect,
Do multiple times intermittently. Incidentally, the EEPROM 26
When the open / closed state of the switching solenoid valve 7 stored and stored in is the open state, the microcomputer 10 does not output the valve open command signal.

As a result, the switching solenoid valve 7 is switched from the closed state to the open state or is maintained in the open state, and gas is supplied to the gas burner 1 from both the main gas passage 2 and the sub gas passage 3. It Then, the microcomputer 10 operates the sparker circuit 13 to generate a spark discharge in the ignition electrode 5 and ignites the gas burner 1 in the same manner as in the first embodiment, so that the combustion operation of the gas burner 1 is started. At this time, a sufficient amount of gas is supplied to the gas burner 1 from both the main gas passage 2 and the sub gas passage 3, so that the gas burner 1 is smoothly ignited.

As described above, according to the gas stove of this embodiment, even if the power supply to the microcomputer 10 is stopped when the gas burner 2 is extinguished, the EEPROM 26 stores and retains the final open / close state of the switching solenoid valve 7. After that, when the gas burner 2 is ignited, the open / closed state of the switching solenoid valve 7 is grasped by the stored contents of the EEPROM 26, and when it is in the closed state, the microcomputer 10 switches the valve opening command signal to drive the solenoid valve drive. The switching solenoid valve 7 can be opened by outputting to the circuit 12, and the gas burner 2 can be smoothly ignited. Then, when the switching solenoid valve 7 is in the open state at the time of ignition, no current is passed through the switching solenoid valve 7, so that further power saving can be achieved.

In this embodiment, the switching solenoid valve drive circuit 12 is supplied with a valve opening command signal and a valve closing command signal by the microcomputer 10.
, Each time they output, their EEPROM 26
Although the open / closed state of the switching solenoid valve 7 is stored and stored, for example, a capacitor charged by the battery 16 during the combustion operation of the gas burner 1 is provided in the power supply circuit 14 and the like, and the ignition / extinction button 8 is extinguished. Therefore, even if the micro switch 17 is opened, the microcomputer 10 is allowed to supply power to the microcomputer 10 for a certain period of time, and the microcomputer 10 stores the current open / closed state of the switching solenoid valve 7 in the EEPROM 26 at the time of power supply by the capacitor. It is also possible to hold it.

Further, in the present embodiment, the microcomputer 10 is used as the valve opening command output means during ignition, and the valve opening command signal is output from the microcomputer 10 according to the stored contents of the EEPROM 26 when the gas burner 1 is ignited. It is also possible to output a valve opening command signal from an appropriate circuit provided separately from 10, depending on the contents stored in the EEPROM 26. In addition, in the embodiments of the first and second aspects described above,
Although the battery 16 is used as the power source for the microcomputer 10 or the like, a commercial power source may be used as the power source. In this case, for example, at the time of power failure, power supply to the microcomputer 10 and the like is stopped, and the microcomputer 10 cannot recognize the open / closed state of the switching solenoid valve 7, but the first
In the same manner as in the embodiment of the second aspect, the valve opening command signal is always output to the switching solenoid valve drive circuit 12 to open the switching solenoid valve 7 when the gas burner 1 is ignited, or the second aspect is implemented. As with the form, the open / closed state of the switching solenoid valve 7 is set to E.
It is stored and held in the EPROM 26, and at the time of ignition, the switching solenoid valve 7 is opened by outputting a valve opening command signal to the switching solenoid valve drive circuit 12 in accordance with the stored contents, thereby igniting the gas burner 1. It can be done smoothly.

In each of the above embodiments, the sub gas passage branches from the main gas passage and joins on the downstream side. However, gas is supplied to the burner from each passage without joining on the downstream side. You may do it. Furthermore, although the gas stove has been described as an example in the embodiments of the first and second aspects, the present invention can also be applied to a gas oven, a heater, or the like.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment of a first aspect of a gas combustion apparatus of the present invention.

FIG. 2 is a circuit configuration diagram of an example of a main part of the gas combustion device of FIG.

FIG. 3 is a circuit configuration diagram of another example of a main part of the gas combustion apparatus of FIG.

FIG. 4 is a system configuration diagram of an embodiment of a second aspect of the gas combustion apparatus of the present invention.

[Explanation of symbols]

1 ... Gas burner, 2 ... Main gas passage, 3 ... Sub gas passage, 7
... switching solenoid valve (self-holding solenoid valve), 10 ... microcomputer, 12 ... switching solenoid valve drive circuit, 16 ... battery.

Claims (4)

[Claims] 1. A main gas passage connected to a gas burner, a sub gas passage connected to the gas burner in parallel with the main gas passage, a solenoid valve provided in the main gas passage, and a combustion operation of the gas burner. In a gas combustion apparatus equipped with a microcomputer for controlling the opening and closing of the solenoid valve to adjust the heating power of the gas burner at times, the solenoid valve is configured by a self-holding solenoid valve, and the self-holding solenoid is ignited when the gas burner is ignited. A gas combustion apparatus comprising ignition-time valve opening command output means for outputting a valve opening command signal for the self-holding solenoid valve to a drive circuit of the self-holding solenoid valve regardless of the open / closed state of the valve. . 2. A main gas passage connected to a gas burner, a sub gas passage connected to the gas burner in parallel with the main gas passage, a solenoid valve provided in the main gas passage, and a combustion operation of the gas burner. In a gas combustion device equipped with a microcomputer for controlling the opening and closing of the solenoid valve so as to adjust the heating power of the gas burner at times, the solenoid valve is constituted by a self-holding solenoid valve, and at the end of the combustion operation of the gas burner. An electrically writable / erasable non-volatile memory that stores and holds the open / closed state of a self-holding solenoid valve according to an instruction from the microcomputer, and the self-holding type that is stored and held in the non-volatile memory when the gas burner is ignited. When the open / close state of the solenoid valve is closed, a valve opening command signal for the self-holding solenoid valve is output to the drive circuit of the self-holding solenoid valve. A gas combustion device, comprising: a valve opening command output means for activating ignition. 3. The gas combustion apparatus according to claim 1, wherein the ignition valve opening command output means intermittently outputs the valve opening command signal when the gas burner is ignited a plurality of times. . 4. The microcomputer uses a battery as a power source, the battery power is supplied when the gas burner is ignited to start, and the battery power is shut off when the gas burner is extinguished. 4. The gas combustion device according to any one of 3 to 3.