JPH0735347A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To readily confirm a capacity of a cell and safely enable use of the cell to the limits of its capacity. CONSTITUTION:In a state, in which ignition and extinguish switches 906, 933, 942 are made on, a cell voltage monitoring circuit 910 resets a microcomputer 907 and lights up a cell figure 924 when a detected voltage E is less than 3.5 volts, suspends operation of the microcomputer 907, lights up the cell figure 924 and continuously rings a buzzer 925 when the detected voltage E is not less than 3.5 volts but less than 4 volts, and flickers the cell figure 924 and continuously rings the buzzer 925 when the detected voltage E is not less than 4 volts but less than 4.2 volts. Further, the cell voltage monitoring circuit 910 puts out the cell figure 924 and suspends the buzzer 925 when the detected voltage E is not less than 4.2 volts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device having a microcomputer and using a battery as an operating power source.

[0002]

2. Description of the Related Art Combustion apparatus, for example, a gas burner for heating a cooking container with gas, an electromagnetic safety valve arranged in a gas pipeline for supplying gas to the gas burner, and a point / extinction for instructing ignition or extinguishing of the gas burner. Conventionally, a gas table is provided with a switch, a microcomputer that ignites a gas burner, a battery that supplies operating power to an electromagnetic safety valve and a microcomputer, and a dead battery notification circuit that turns off a pilot lamp when the battery voltage falls below a threshold value. Better known.

In this gas table, when the user manually operates the point / fire extinguishing switch, the microcomputer energizes the electromagnetic safety valve to open the valve and the sparker to energize the gas burner.

[0004]

In the above gas table, when the threshold value is set low, the battery is used before the battery capacity runs out, which is economical, but there is not enough time to buy a new battery. However, the use of the electromagnetic safety valve is often forcibly continued, in which case the electromagnetic safety valve may not be maintained open and the operation of the microcomputer may become unstable.

Further, if the threshold value is set to a high value, there will be more time to buy a new battery, and even if the pilot lamp is turned off, the electromagnetic safety valve will immediately fail to maintain its open state, or the microcomputer will not operate. The operation does not become unstable, but it is uneconomical because it requires replacement even though the battery capacity is still sufficient.

An object of the present invention is to provide a combustion device which allows the battery capacity to be easily confirmed and can be safely used up to the limit of the battery capacity.

[0007]

In order to solve the above problems, the present invention employs the following configurations. (1) A solenoid valve that is disposed in a fuel supply path that supplies fuel to a burner that heats an object to be heated and that is opened by energization, and a micro that controls energization of the solenoid valve and ignition of the burner. In a combustion device having a computer, the solenoid valve, and a battery storing electric power for operating the microcomputer, a notification device capable of reporting in different notification modes, and a battery voltage for monitoring the terminal voltage of the battery, etc. Monitoring means is provided, the battery voltage monitoring means, if the detected voltage is less than the first set value that is set to the lowest, resets the microcomputer and operates the alarm in the first mode, When the detected voltage is less than the second set value that is set next lower and is equal to or more than the first set value, the microcomputer is instructed to cut off the energization of the solenoid valve and prohibit the ignition of the burner. If the detected voltage is less than the third set value set next lower and is equal to or more than the second set value, the alarm is operated in the first mode. When the detection voltage is less than the next lower set fourth setting value and is equal to or more than the third setting value, the alarm is operated in the second mode, and the detection voltage is set to the fourth setting value.
When the value is equal to or more than the set value, the alarm device is not operated.

(2) A solenoid valve which is arranged in a fuel supply path for supplying fuel to a burner for heating an object to be heated and which is opened by energization, and a point for instructing ignition or extinction of the burner.
A fire extinguishing switch, a microcomputer for instructing energization of the solenoid valve and ignition of a burner by an ignition operation of the point / fire extinguishing switch, the solenoid valve, and a battery for supplying operating power to the microcomputer. In the combustion device, an alarm that can notify in different notification modes,
A battery voltage monitoring means for monitoring the terminal voltage of the battery when the point / fire switch is ignited is provided, and the battery voltage monitoring means has a detection voltage lower than the lowest first set value. In this case, the microcomputer is reset and the second detection voltage is set to the next lower value.
If it is less than the set value and is equal to or more than the first set value, the microcomputer is instructed to interrupt the energization of the solenoid valve and to prohibit the ignition of the burner, and the alarm is operated in the first mode. If the detected voltage is less than the third set value that is set to a low value and is equal to or more than the second set value, the alarm is operated in the second mode, and if the detected voltage is equal to or more than the third set value, the alarm is operated. I did not let it.

[0009]

[Action]

[Claim 1] When the detected voltage is equal to or higher than the second set value, the microcomputer instructs energization of the solenoid valve and ignition of the burner, and the burner starts combustion to heat the object to be heated. If the detected voltage is equal to or higher than the fourth set value, no notification is given. If the detected voltage is less than the fourth set value, or if the detected voltage is equal to or higher than the third set value, the annunciator gives the notification in the second mode and less than the third set value. If the value is equal to or more than the second set value, the notification is given in the first format.

When the detected voltage is less than the second set value and equal to or more than the first set value, the battery voltage monitoring means instructs the microcomputer to cut off the energization of the solenoid valve and prohibit the ignition of the burner, so that the burner is not ignited. . Also, the annunciator provides an alert in the first mode.

When the detected voltage is less than the lowest first set value, the battery voltage monitoring means resets the microcomputer so that the solenoid valve remains closed and the burner remains extinguished. To do. Also, the annunciator provides an alert in the first mode.

[Claim 2] When the point / fire extinguishing switch is ignited, the microcomputer instructs energization of the solenoid valve and ignition of the burner, and the burner starts combustion to heat the object to be heated (detection). If the voltage is above the second set value). When the detected voltage is equal to or higher than the third set value, the alarm does not notify, and when the detected voltage is lower than the third set value and equal to or higher than the second set value, the alarm notifies in the second manner.

When the detected voltage is less than the second set value and equal to or more than the first set value, the battery voltage monitoring means instructs the microcomputer to cut off the energization of the solenoid valve and prohibit the ignition of the burner, so that the burner is not ignited. . Also, the annunciator provides an alert in the first mode.

When the detected voltage is less than the lowest first set value, the battery voltage monitoring means resets the microcomputer so that the solenoid valve remains closed and the burner remains extinguished. To do.

[0015]

【The invention's effect】

[Claim 1] The alarm does not notify when the detected voltage is equal to or higher than the fourth set value, and the alarm is less than the fourth set value and the third
When the value is equal to or more than the set value, the notification is performed in the second format, and when the value is less than the third set value, the notification is performed in the first format. Therefore,
From the content of the notification of the alarm device, the user can easily know how much battery capacity is currently remaining, and there will be time to buy a new battery.

When the detected voltage is less than the second set value and equal to or more than the first set value, the battery voltage monitoring means instructs the microcomputer to stop energizing the solenoid valve and prohibit ignition of the burner. In this case, the microcomputer is in the reset state. That is, until the detected voltage reaches the second set value, energization of the solenoid valve by the microcomputer and ignition of the burner are not prohibited. Therefore, the battery can be used up to the limit of the safe range, which is economical.

[Claim 2] The alarm device does not notify when the detected voltage is equal to or higher than the third set value, and notifies in the second manner when the detected voltage is lower than the third set value or equal to or higher than the second set value. Do. For this reason, the user can easily know how much battery capacity still remains from the notification content of the alarm device, and there will be time to buy a new battery.

When the detected voltage is less than the second set value and equal to or more than the first set value, the battery voltage monitoring means instructs the microcomputer to stop energizing the electromagnetic safety valve and prohibit ignition of the burner. In this case, the microcomputer is in the reset state. That is, until the detected voltage reaches the second set value, energization of the solenoid valve by the microcomputer and ignition of the gas burner are not prohibited. Therefore, the combustion device is economical because the battery can be used up to the limit of the safe range.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention (corresponding to claim 1) will be described with reference to FIGS. As shown in FIGS.
The gas water heater A includes a heat exchange channel 1 formed by connecting a water supply pipe 11, a heat exchanger 12, and a hot water outlet pipe 13 in series, a gas burner 2 for heating the heat exchanger 12, and a heat exchange channel 1. Water stop valve 3 provided and operation switch 4 for instructing start or stop of hot water supply
And an electromagnetic safety valve 211 arranged in the gas pipeline 21,
It includes a microcomputer 5, a dry battery 6, an LCD 7 as an alarm, and a battery voltage monitoring circuit 8.

The water supply pipe 11 is provided with a water shutoff valve 3 in the uppermost stream, and a water governor valve 1 which also functions as a water pressure responsive member downstream thereof.
11 is provided, and the water amount control valve 1 is provided downstream of the water governor valve 111.
12 are arranged.

The hot water outlet pipe 13 is constructed by coating a metal flexible pipe with a resin pipe, and the shower head 13 at the tip.
1 is fitted. A water flow switch 132 is attached to the shower head 131 so that a shower or straight water flow 133 can be selected.

The gas burner 2 installed below the heat exchanger 12 is supplied with gas via the gas pipe 21, and is ignited and burned by the spark discharge of the sparker 22.

The gas pipeline 21 is connected to the electromagnetic safety valve 211 and the water governor valve 111 from the upstream side, and the hydraulic pressure responsive valve 21 is connected.
2, a gas governor valve 213, and a gas amount control valve 214 are arranged. The gas amount control valve 214 is the water amount control valve 1
12 is connected to the hot water temperature setting lever L, and the gas amount and the water amount corresponding to the sliding amount of the hot water temperature setting lever L are supplied to the gas burner 2 and the heat exchanger 12, respectively. In addition, the water flow switch 14 connected to the water pressure responsive valve 212 is used for the heat exchange channel 1.
It closes when running water is detected.

As shown in FIGS. 3 and 4, the water shutoff valve 3 is a valve that opens when the spindle 32 is pressed and the pilot valve 33 operates. The cam 341, the position switch 342, and the water shutoff valve drive. It is driven by the water stop valve drive means 34 which is constituted by a circuit 340 and a switch 348 which outputs an ignition preparation completion signal 349.

The cam 341 having a circular cross section is fixed to the drive shaft 311 of the motor 31 and rotates, and presses the spindle 32 when the thick portion 345 reaches the position of the spindle 32. or,
A notch 344 is formed in the upper half of the cam thickness in the thin portion 343 where the water shutoff valve 3 is fully closed, and a notch 346 is formed in the thick portion 345 where the water shutoff valve 3 is fully opened.

The normally open (OFF when not pressed) position switch 342 includes a spring-like movable piece 3 on the upper peripheral wall of the cam 341.
47 is arranged in contact with the movable piece 3 by the rotation of the motor 31.
When 47 is fitted into the notches 344 and 346 and the pressure contact state is released, the electric contact opens.

Normally closed type (ON when not pressed) switch 3
The cam 48 is arranged in parallel with the position switch 342 so that a spring-like movable piece (not shown) is in contact with the lower peripheral wall of the cam 341. The rotation of the motor 31 causes the movable piece 347 to be cut out.
When it is fitted in 46 and the pressure contact state is released, the electrical contact is closed, and the microcomputer 5 is sent an ignition ready signal 349.
Is sent.

The water shutoff valve drive circuit 340 includes the operation switch 4
When is pressed by the user's finger to close the contact, a Hi signal is input and the motor 31 is energized. At the time of pressing at the time of starting hot water supply, even if the finger is separated from the operation switch 4 and the contact is opened, the position switch 342 is immediately closed due to the rotation of the cam 341. Therefore, the movable piece 347 of the position switch 342 is cut out 346. Since the Hi signal is continuously input until it is fitted into the
Continue to rotate.

Further, since the position switch 342 is closed immediately after the finger is separated from the operation switch 4 and the contact is opened at the time of pressing at the end of hot water supply, the position switch 34 is closed.
Since the Hi signal continues to be input until the second movable piece 347 fits into the cutout 344, the water shutoff valve drive circuit 340 continues the rotation of the motor 31.

The operation switch 4 is a normally open push button switch whose contacts are brought into conduction by a light pressing operation.

When the water flow switch 14 is closed and the ignition preparation completion signal 349 is input, the microcomputer 5 sends a valve opening signal to the electromagnetic safety valve drive circuit 51 which drives the electromagnetic safety valve 211, and the sparker 22. An ignition signal is sent to the ignition control circuit 52 that energizes for a predetermined time. It should be noted that the microcomputer 5 stops the transmission of the valve opening signal and stops the electromagnetic safety valve 211 when the safe combustion signal 530 described later is interrupted (however, after a lapse of a predetermined time (for example, 15 seconds) after transmitting the ignition signal). Close the valve and extinguish the gas burner 2.

The combustion detection circuit 53 monitors the combustion of the gas burner 2 by the thermocouple 531 and the flame rod 532, and when the normal combustion is maintained, the safe combustion signal 53
0 is sent to the microcomputer 5.

In the present embodiment, the dry battery 6 is a single type 1.5.
It is composed of two V manganese dry batteries connected in series and outputs an electromotive force of 3 V in a new state.

The LCD 7 capable of displaying with a minimum current is a liquid crystal display in which a figure of a predetermined shape is drawn, and is driven by the battery voltage monitoring circuit 8.

As shown in the flow chart of FIG. 6, the battery voltage monitoring circuit 8 detects the terminal voltage of the dry battery 6 under no load and under load, and causes the LCD 7 to flicker or continuously based on the magnitude of the detected voltage E. Turn on or off. In this embodiment, the detection under load is performed based on the safe combustion signal 530.

The operation of the gas water heater A will now be described (see FIG. 5). When a light pressing operation is performed on the operation switch 4 to close the contact of the operation switch 4, the water shutoff valve drive circuit 34
The Hi signal is input to 0, the motor 31 starts, and the cam 3
41 starts rotating in the direction of the arrow.

With the rotation of the cam 341, the movable piece 347 of the position switch 342 separates from the notch 344 to close the contact, so that the position switch 342 stops the water even after the Hi signal from the operation switch 4 is stopped. Valve drive circuit 3
The Hi signal is input to 40, and the motor 31 continues to operate.

Then, the spindle 32 is pressed by the cam 341, the water shutoff valve 3 starts to open, the contacts of the water flow switch 14 are closed, and the microcomputer 5, the electromagnetic safety valve drive circuit 51, the combustion detection circuit 53, and the ignition. The power supply of the dry battery 6 to the control circuit 52 is started.

When the cam 341 further rotates, the movable piece 347 of the position switch 342 is fitted into the notch 346, and the contact of the position switch 342 is opened. Also, the switch 34
The movable piece of No. 8 is fitted in the notch 346 to release the pressure contact state, the electric contact is closed, and the ignition preparation completion signal 349 is sent to the microcomputer 5.

In this state, the water shutoff valve 3 is fully opened,
Since the Hi signal is not input to the water shutoff valve drive circuit 340, the motor 31 is de-energized and stopped, and the ignition ready signal 349 is sent to the microcomputer 5.

Therefore, the microcomputer 5 sends a valve opening signal to the electromagnetic safety valve drive circuit 51 and sends an ignition signal to the ignition control circuit 52.
The spark safety power is supplied to the sparker 22 for a predetermined time, and the electromagnetic safety valve drive circuit 51 opens the electromagnetic safety valve 211, so that the gas burner 2 ignites and the shower head 13
Hot water is discharged from 1.

During hot water supply, a light pressing operation is performed on the operation switch 4
When the contact of the operation switch 4 is closed, a Hi signal is input to the water shutoff valve drive circuit 340, the motor 31 is activated again, the cam 341 restarts rotation, and the position switch 3
The movable piece 347 of 42 separates from the notch 346, and the contact of the position switch 342 is closed. Also, switch 348
The movable piece of the above is separated from the notch 346 and the contact is opened, so that the ignition preparation completion signal 349 is stopped.

Therefore, the microcomputer 5, the electromagnetic safety valve drive circuit 51, the combustion detection circuit 53, the ignition control circuit 5
The power supply to 2 is stopped, while the motor 31 continues to operate and starts closing the water shutoff valve 3.

When the cam 341 further rotates to close the water shutoff valve 3, the movable piece 347 of the position switch 342 is fitted into the notch 344 and the contact of the position switch 342 is opened, so that the motor 31 is stopped. The hot water discharged from the shower head 131 completely stops.

Next, the operation of the battery voltage monitoring circuit 8 is shown in FIG.
A description will be given based on the flowchart. Step s1
Then, the battery voltage monitoring circuit 8 determines whether or not the detected voltage E is less than 1.3 V, and when E <1.3 V (YES)
Goes to step s2, and if E ≧ 1.3 V (NO), goes to step s3. The determination in step s1 is performed in the unloaded state and from the time when the operation switch 4 is pressed until just before the safe combustion signal 530 is sent (time 91).

During the time 91, the detected voltage E becomes less than 1.3 V, so in step s2 the battery voltage monitoring circuit 8
Resets the microcomputer 5 and resets the LCD 7 to the lit state.

If the microcomputer 5 is reset after the operation switch 4 is pressed (during time 91), when the user presses the operation switch 4, the water stop valve is driven. The Hi signal is input to the circuit 340, the motor 31 is activated again, the cam 341 resumes rotation, and the cam 341 closes the water shutoff valve 3, so that the water discharged from the shower head 131 is stopped and the movable piece of the position switch 342 is stopped. 347 is fitted in the notch 344, and the contact of the position switch 342 is opened.

In step s3, the battery voltage monitoring circuit 8 detects the safe combustion signal 530, and the safe combustion signal 530 is detected.
If is not detected (NO), the process proceeds to step s4, and if it is detected (YES), the process proceeds to step s5.

In step s4, the battery voltage monitoring circuit 8
The LCD 7 is turned off (if it is already turned off, the off state is continued), and the process returns to step s1.

At step s5, the battery voltage monitoring circuit 8
It is determined whether the detection voltage E is less than 1.3 V, and E <
If 1.3V (YES), the process proceeds to step s6, where E ≧
In the case of 1.3V (NO), the process proceeds to step s7.

During the time 92, the detected voltage E becomes less than 1.3 V, so that the battery voltage monitoring circuit 8 is operated at step s6.
Resets the microcomputer 5 and resets the LCD 7 to the lit state.
Since the microcomputer 5 is in the reset state, the microcomputer 5 operates the electromagnetic safety valve drive circuit 51.
The gas burner 2 will extinguish the fire, because the valve open signal will not be sent to.

When the user presses the operation switch 4 in this state, a Hi signal is input to the water shutoff valve drive circuit 340, the motor 31 is actuated again, and the cam 341 resumes rotation to cause the cam 341 to rotate. Since the water shutoff valve 3 is closed, the water discharged from the shower head 131 is stopped, the movable piece 347 of the position switch 342 is fitted into the notch 344, and the contact of the position switch 342 is opened.

At step s7, the battery voltage monitoring circuit 8
It is determined whether or not the detection voltage E is between 1.3 V and less than 1.8 V, and if 1.3 V ≦ E <1.8 V (YES)
Goes to step s8, and if E ≧ 1.8V (NO), goes to step s13.

At step s8, the battery voltage monitoring circuit 8
An operation stop signal for stopping the operation of the microcomputer 5 is sent to the microcomputer 5, and the process proceeds to step s9.

At step s9, the battery voltage monitoring circuit 8 is set to L
The CD 7 is turned on and the process proceeds to step s10. Since the microcomputer 5 does not send the valve opening signal to the electromagnetic safety valve drive circuit 51, the gas burner 2 extinguishes the fire.

In this state, when the user performs a pressing operation on the operation switch 4, a Hi signal is input to the water shutoff valve drive circuit 340, the motor 31 operates again, and the cam 341 restarts to rotate and the cam 341. Since the water shutoff valve 3 is closed, the water discharged from the shower head 131 is stopped, the movable piece 347 of the position switch 342 is fitted into the notch 344, and the contact of the position switch 342 is opened.

When the water discharged from the shower head 131 is stopped, the user presses the operation switch 4, the water stop valve 3 is opened, the gas burner 2 is in a combustion state, and the safe combustion signal 530 is generated. Is detected (YES in step s10), the process returns to step s5.
If the operation switch 4 is not pressed or immediately after combustion and the safe combustion signal 530 is not detected (NO in step s10), the process proceeds to step s11.

In step s11, the battery voltage monitoring circuit 8
Determines whether the detection voltage E is less than 1.3 V,
If E <1.3V (YES), the process proceeds to step s12, and if E ≧ 1.3V (NO), the process returns to step s10.

In step s12, the battery voltage monitoring circuit 8
Resets the microcomputer 5 and resets the LCD 7 to the lit state.

In step s13, the battery voltage monitoring circuit 8
Determines whether or not the detection voltage E is between 1.8 V and less than 1.9 V, and when 1.8 V ≦ E <1.9 V (YE
S) proceeds to step s14, and when E ≧ 1.9V (N)
O) advances to step s15.

In step s14, the battery voltage monitoring circuit 8 turns on the LCD 7 (the hot water supply operation is maintained), and the process returns to step s3.

In step s15, the battery voltage monitoring circuit 8
Determines whether the detection voltage E is between 1.9 V and less than 2.1 V, and when 1.9 V ≦ E <2.1 V (YE
S) proceeds to step s16, and if E ≧ 2.1V (N
O) advances to step s17.

In step s16, the battery voltage monitoring circuit 8 sets the LCD 7 in the flicker state (the hot water supply operation is maintained), and the process returns to step s3.

In step s17, the battery voltage monitoring circuit 8 turns off the LCD 7 (the hot water supply operation is maintained), and the process returns to step s3.

Next, the advantages of the gas water heater A will be described. [A] The battery voltage monitoring circuit 8 turns off the LCD 7 when the detected voltage E is 2.1 V or more, and the voltage is less than 2.1 V.
When the voltage is 9 V or more, the flicker is turned on, and when the voltage is less than 1.9 V, the light is turned on. Therefore, from the display condition of the LCD 7, the user can see at a glance how much the capacity of the dry battery 6 is currently left, and there is time to buy a new dry battery 6.

[A] The battery voltage monitoring circuit 8 detects the detection voltage E
Is less than 1.8V and 1.3V or more, electromagnetic safety valve 21
When the detection voltage E is less than 1.3 V, the microcomputer 5 is reset. In other words, the energization of the electromagnetic safety valve 211 and the ignition of the gas burner 2 by the microcomputer 5 are not prohibited until the detection voltage E reaches 1.3V. Therefore, the dry battery 6 can be used up to the limit of the safe range, which is economical.

[C] When the detection voltage E is less than 1.3 V in the no-load state in which the operation switch 4 is not operated and in the period (including the maximum load state) where the safe combustion signal 530 is not detected immediately after combustion, The battery voltage monitoring circuit 8 puts the microcomputer 5 in a reset state (the LCD 7 is in a lighting state) {YES in step s1}. Therefore,
Electromagnetic safety valve 211 during each period of time 91, 92
It is possible to prevent poor valve opening maintenance and unstable operation of the microcomputer 5.

[D] When the safe combustion signal 530 is no longer detected (the gas burner 2 is extinguished) during the period of time 92, 1.3V ≦ E <1.8 and 1.8V ≦ E <1.9.
V, 1.9V ≦ E <2.1V, E ≧ 2.1V detection voltage change only to E <1.3V, LCD
7 (step s14) and flicker (step s)
16) is released (except when 1.3V ≦ E <1.8V or E <1.3V). Therefore, the notification during the time 91 is not complicated, and the gas water heater A is excellent in usability.

Next, a second embodiment of the present invention (corresponding to claim 2) will be described with reference to FIGS. As shown in FIGS. 7 and 8, the gas table B includes a left stove 902 for heating the cooking vessel 901 and an M burner 903 for the left stove 902.
An electromagnetic safety valve 905 which is disposed in a gas pipeline 904 for supplying gas to the valve and is opened by energization, and an M burner 903
A point / fire extinguishing switch 906 for instructing ignition or extinguishing of the battery, a microcomputer 907, a dry battery 908, an LCD 909 as an alarm, and a battery voltage monitoring circuit 910. In addition, the gas table B has a right stove 926 (gas consumption is 4100 kcal / h at maximum) and a grill 927.
Also prepare.

The left stove 902 has a maximum of 2300 kcal
It has an M burner 903 having a gas consumption of / h and is installed on the left side in the drawing. Further, a thermocouple 916 that generates an electromotive force by an ignition electrode 913 that performs spark discharge and a combustion flame 915 is arranged so as to face the gas ejection flame port of the M burner 903. In FIG. 8, reference numeral 919 denotes a temperature control solenoid valve arranged in the main gas pipeline 917 among the main gas pipeline 917 and the sub gas pipeline 918 branched from the gas pipeline 904, and 920 denotes the gas pipeline 904. It is the main valve placed inside. Further, the M burner 903 has a small fire when the temperature control solenoid valve 919 is in a closed state, and has a large fire when the valve is in an open state.

LCD 90 for displaying set temperature and battery capacity
9 is arranged on an operation panel 943 provided on the left front side of the gas table B, and is electrically connected to a control unit 911 to which a microcomputer 907 and a battery voltage monitoring circuit 910 are assembled.

The microcomputer 907 operates the electromagnetic safety valve 905 (934, 939) and the ignition electrode 9 based on the ignition operation of the point / fire extinguishing switch 906 (933, 942).
13 (928, 937) is instructed to energize, and M burner 9
After ignition of 03, the temperature control solenoid valve 919 is opened / closed based on the set temperature and the detected temperature to control the temperature control and control the combustion force of the M burner 903. Also, thermo couple 91
6 (930, 938) detects a misfire, and the battery voltage monitoring circuit 910 sends an operation stop signal to the microcomputer 9
Electromagnetic safety valve 905 (934, 939) when sent to 07
To the M burner 903 (H burner 931,
Extinguish the grill burner 936).

The set temperature is set by the temperature setting keys 921 and 92.
The temperature is set by 2 and the detected temperature is the thermosensitive cylinder 9 with built-in thermistor
23, 932.

In this embodiment, the dry battery 908 is formed by connecting four single type 1.5V manganese dry batteries in series, and outputs an electromotive force of 6V in a new state.

LCD 909 capable of displaying with a minimum current
Is a liquid crystal display having a battery figure 924 that imitates the shape of a battery and a segment that digitally displays the set temperature and the like, and is driven by the battery voltage monitoring circuit 910.

As shown in the flowchart of FIG. 9, the battery voltage monitoring circuit 910 starts detection of the terminal voltage of the dry battery 908 at the time of ignition operation, and flickers the battery pattern 924 of the LCD 909 based on the magnitude of the detected voltage E. The buzzer 925 is turned on or off continuously, and the buzzer 925 sounds intermittently, continuously, or without sound.

The right stove 926 is installed on the right side of the drawing,
The H-burner 9 is the thermocouple 930 that generates an electromotive force by the ignition electrode 928 that performs ignition discharge and the combustion flame 929.
A heat-sensitive tube 932 is provided in the center of the H burner 931 in the center of the H burner 931 like the M burner 902, and the temperature of the cooking container 901 is adjusted to automatically extinguish charring and overheating. Is being detected. In FIG. 8, 933 is a point / fire extinguishing switch, and 934 is a gas line 9.
An electromagnetic safety valve 935 arranged at 00 is a main valve.

The grill burner 936 (maximum gas consumption of 1950 kcal / h) of the grill 927 is formed by a porous combustion plate, and the porous combustion plate generates an electromotive force due to an ignition electrode 937 for performing an ignition discharge and a combustion flame. A thermocouple 938 is arranged to face. In addition, 939, 94
Reference numeral 0 is an electromagnetic safety valve and a main valve arranged in the gas pipeline 941, and 942 is a point / fire extinguishing switch.

Next, the operation of the battery voltage monitoring circuit 910 will be described with reference to the flowchart of FIG. Step S
1, the battery voltage monitoring circuit 910 turns on the point / fire switch 9
It is determined whether any one of the electric contacts 06, 933 and 942 is closed, and if any one of them is closed (YES), the process proceeds to step S2. By closing the point / fire extinguishing switches 906, 933, 942, operating power is supplied to the microcomputer 907 and the battery voltage monitoring circuit 910.

In step S2, the battery voltage monitoring circuit 910
Determines whether the detection voltage E is less than 3.5 V, and E
If <3.5 V (YES), proceed to step S3, where E
If ≧ 3.5V (NO), the process proceeds to step S4.

In step S3, the battery voltage monitoring circuit 910
Resets the microcomputer 907 to a reset state (stop operation state) and sets the battery graphic 924 to a continuous lighting state. Since the microcomputer 907 is in the reset state, the electromagnetic safety valves 905, 934, 939
Is closed and the burning burner extinguishes.

In step S4, the battery voltage monitoring circuit 910
Determines whether the detection voltage E is 3.5 V or more and less than 4 V. If 3.5 V ≦ E <4 V (YES), the process proceeds to step S5, and if E ≧ 4 V or more (NO), the step proceeds. Proceed to S6.

In step S5, the battery voltage monitoring circuit 910
Sends an operation stop signal for stopping the operation of the microcomputer 5 to the microcomputer 907, and the battery graphic 9
24 is continuously turned on, and the buzzer 925 is continuously sounded. Since the microcomputer 907 is deactivated, the electromagnetic safety valves 905, 934, 939 are closed, and the burning burner is extinguished.

In step S6, the battery voltage monitoring circuit 910
Determines whether the detection voltage E is 4 V or more and less than 4.2 V. If 4 V ≦ E <4.2 V (YES), the process proceeds to step S7, and if E ≧ 4.2 V or more (NO). Proceeds to step S8.

In step S7, the battery voltage monitoring circuit 910
Causes the battery graphic 924 to flicker and causes the buzzer 925 to intermittently ring. Incidentally, the microcomputer 907
Continues to operate, so the burning burner continues to burn.

In step S8, the battery voltage monitoring circuit 910
Turns off the battery graphic 924 (continues the extinguished state if it is already extinguished), stops the buzzer 925 (continues the stopped state if already extinguished), and returns to step S1.
Since the microcomputer 907 continues to operate, the burning burner continues to burn.

The gas table B of this embodiment has the following advantages. [A] The battery voltage monitoring circuit 910 includes a point / fire switch 9
After pressing one or more of 06, 933, 942,
When the detection voltage E is 4.2 V or more, the battery pattern 924 is turned off and the buzzer 925 is not sounded, but 4.2 V
If it is less than or equal to 4V or more, flicker is caused and the buzzer 925 is continuously sounded. Therefore, the battery pattern 9
From the display condition of 24 and the buzzer sound, the user can easily know how much capacity of the dry battery 908 still remains at the same time, and there will be time to buy a new dry battery 908.

[B] The battery voltage monitoring circuit 910 sends an operation stop signal to the microcomputer 907 when the detection voltage E is less than 4V and 3.5V or more, and when the detection voltage E is less than 3.5V, The computer 907 is in a reset state. That is, until the detection voltage E reaches 4 V, the microcomputer 907 energizes the electromagnetic safety valves 905, 934, 939 and the M burners 903, H.
Ignition of the burner 931 and the grill burner 936 is not prohibited. Therefore, the dry battery 908 can be used up to the limit of the safe range, which is economical.

[U] When the detected voltage E becomes less than 3.5 V under load, the battery voltage monitoring circuit 910 resets the microcomputer 907 (battery pattern 924).
Is turned on) (YES in step S2).
Further, when there is a load, the detection voltage E is 3.5 V ≦ E <4
When the voltage reaches V, the battery voltage monitoring circuit 910 puts the microcomputer 907 into an inoperative state (battery pattern 924 is in a lighting state, buzzer 925 continuously sounds) (Y in step S4).
ES}. Therefore, when the gas table B is in use, it is possible to prevent inadequate valve open maintenance of the electromagnetic safety valves 905, 934, 939 and unstable operation of the microcomputer 907.

The present invention includes the following embodiments in addition to the above embodiments. a. In the above embodiment, two batteries (first embodiment) and four batteries (second embodiment) are used, but any number of batteries may be used. Further, the size of the battery may be a size A battery or the like.

B. The notification device may be an LED, a buzzer, a voice synthesizer, or the like, instead of the LCD.

C. Monitoring of the terminal voltage of the battery by the battery voltage monitoring means may be performed without load or with load.

[Brief description of drawings]

FIG. 1 is an external view of a gas water heater according to a first embodiment of the present invention.

FIG. 2 is a structural explanatory view of the gas water heater.

FIG. 3 is a block diagram of the gas water heater.

FIG. 4 is an explanatory view of essential parts near the water shutoff valve of the gas water heater.

FIG. 5 is a time chart of each part of the gas water heater.

FIG. 6 is a flowchart showing the operation of a battery voltage monitoring circuit incorporated in the gas water heater.

FIG. 7 is an external view of a gas table according to a second embodiment of the present invention.

FIG. 8 is a structural explanatory view of the gas table.

FIG. 9 is a flowchart showing the operation of a battery voltage monitoring circuit incorporated in the gas water heater.

[Explanation of symbols]

 A gas water heater (combustion device) 2 gas burner (burner) 5 microcomputer 6 dry battery (battery) 7 LCD (alarm) 8 battery voltage monitoring circuit (battery voltage monitoring means) 12 heat exchanger (heated object) 21 gas Pipe line (fuel supply line) 211 Electromagnetic safety valve (solenoid valve) B Gas table (combustion device) 901 Cooking container (heated object) 903 M burner (burner) 931 H burner (burner) 936 Grill burner (burner) 900, 904, 941 Gas pipeline (fuel supply channel) 905, 934, 939 Electromagnetic safety valve (solenoid valve) 906, 933, 942 Point / fire extinguishing switch 907 Microcomputer 908 Dry battery (battery) 909 LCD (alarm) 910 Battery voltage monitoring circuit (battery) Voltage monitoring means)

Claims (2)

[Claims] 1. A solenoid valve disposed in a fuel supply path for supplying fuel to a burner for heating an object to be heated, which is opened by energization, and energization of the solenoid valve and ignition of the burner are controlled. In a combustion device having a microcomputer, a solenoid valve, and a battery that stores electric power for operating the microcomputer, an alarm device that can notify in different notification modes, and monitor the terminal voltage of the battery, etc. Battery voltage monitoring means is provided, and the battery voltage monitoring means resets the microcomputer and operates the alarm in the first mode when the detected voltage is less than the lowest first set value. If the detected voltage is less than the second set value which is set next lower and is equal to or more than the first set value, the micro valve is turned off and the burner ignition is prohibited. If the detection voltage is less than the third set value which is set next lower and is equal to or more than the second set value while instructing the computer and operating the alarm in the first mode, operate the alarm in the first mode. When the detection voltage is less than the next lower set fourth setting value and is the third setting value or more, the alarm is operated in the second mode, and the detection voltage is the fourth setting value or more. Is a combustion device in which the alarm is disabled. 2. A solenoid valve which is disposed in a fuel supply path for supplying fuel to a burner for heating an object to be heated and which is opened by energization, and a point / fire switch for instructing ignition or extinction of the burner. And a combustion device including a microcomputer for instructing energization of the solenoid valve and ignition of a burner by an ignition operation of the point / fire switch, and a battery for supplying operating power to the solenoid valve and the microcomputer. In, an alarm device capable of notifying in different notification modes, and a battery voltage monitoring means for monitoring the terminal voltage of the battery when the point / fire switch is ignited are provided, the battery voltage monitoring means comprising: When the detected voltage is less than the lowest set first setting value, the microcomputer is reset, and the detected voltage is set to the next lower set second value, If it is equal to or more than 1 set value, the microcomputer is instructed to cut off the energization of the solenoid valve and to prohibit the ignition of the burner, and the alarm is operated in the first mode. A combustion device in which the alarm is operated in a second mode when the value is less than a set value and is the second set value or more, and the alarm is not operated when the detected voltage is the third set value or more. .