JP3014611B2 - Battery controlled combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a dry battery as a power source and a fuel supply path for supplying fuel to a burner.
The present invention relates to a battery-controlled combustion device that opens and closes with a solenoid valve and a control valve operated by an electric motor.

[0002]

2. Description of the Related Art For example, in a gas combustion apparatus such as a gas reheating apparatus for reheating a bath by burning gas, an on-off valve is disposed in a fuel supply path, and the on-off valve is controlled to be opened and closed by a control circuit. . In addition, by using a dry cell as a power source, the price of the combustion device can be reduced,
The combustion device can be easily installed even in a place where there is no commercial power supply.

[0003] On-off valves used in the fuel supply path include:
There are an electromagnetic valve that opens a fuel supply path by a magnetic force generated by an electromagnetic coil, a control valve that opens and closes a fuel supply path by using a rotational force generated by an electric motor, and the like. The energization of these solenoid valves and control valves is controlled by a microcomputer. When a dry battery is used as a power source, it is conceivable to stop energizing the microcomputer after the operation of the combustion device is completed in order to extend the life of the dry battery.

When a non-locking type switch is used as an operation switch, the microcomputer is energized as follows. By pressing the operation switch, switch elements such as transistors are turned on.
Then, energization of the microcomputer is started. After the operation switch is depressed, the ON state of the switch element is maintained by an energization instruction signal from the microcomputer. After the operation of the combustion device stops, the energization instruction signal from the microcomputer stops, the switch element turns off, and the energization of the microcomputer stops.

[0005]

In a combustion apparatus using a dry cell as a power source, it is difficult to remove the dry cell during combustion,
When the dry battery is removed to replace the battery during combustion, the solenoid valve closes because the magnetic force of the solenoid coil is lost. However, the control valve stops in an open state due to the stop of the electric motor. Then, even if the user again stores (resets) the dry battery, in the conventional case, power is not supplied to the microcomputer until the operation switch is pressed, and the control valve remains open. Therefore, in the fuel supply path, the supply of gas is stopped by closing the solenoid valve, but the control valve remains open.

In order to solve this problem, it is conceivable that when the dry batteries are reset, it is detected that the dry batteries have been set and the microcomputer is energized. However, the control circuit becomes complicated, and even when the dry battery is replaced while the operation of the combustion device is stopped, the power supply to the microcomputer is automatically started, so that the life of the dry battery is shortened.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion apparatus having a control valve driven by an electric motor, in which a dry battery is used as a power source, and even if the dry battery is removed, the control valve is surely set if the dry battery is reset. It is an object of the present invention to provide a battery-controlled combustion device capable of closing a valve and further extending the life of a used dry battery.

[0008]

The battery control type combustion apparatus of the present invention employs the following technical means to achieve the above object. [Claim 1] A battery-controlled combustion device includes a burner for burning fuel, a fuel supply passage for supplying fuel to the burner, and a fuel supply passage provided in the fuel supply passage. An electromagnetic valve that opens the fuel supply path and closes the fuel supply path in a state where the power supply is stopped, and is provided in series with the electromagnetic valve, and supplies and shuts off the fuel to the burner according to the rotation of the electric motor. A control having a control valve, a detection switch for detecting the open / closed state of the control valve, a non-lock type operation switch for instructing start of operation, and a microcomputer for controlling the energization of the solenoid valve and the electric motor. A power supply for supplying power to the control circuit and supplying power for operation to the solenoid valve and the electric motor; and a battery between the dry battery and the microcomputer. A switch element that includes a current supply control circuit for controlling the supply of operating power to the microcomputer.

The energization control circuit includes: (a) when the operation switch is turned on; (b) when an energization instruction signal is received from the microcomputer; and (c) when the detection switch is in the open state of the control valve. When detecting
The switch element is turned on.

According to a second aspect of the present invention, in the battery control type combustion apparatus according to the first aspect, when energization is started, the microcomputer detects a setting state of the detection switch, and the setting state is determined by the control valve. In the open state, the electric power is supplied to the electric motor until the control valve is closed.

[0011]

When a non-lock type operation switch is pressed, the energization control circuit turns on the switch element and starts energization of the microcomputer. When energization is started, the microcomputer outputs an energization instruction signal for turning on the switch element to the energization control circuit and starts the combustion operation. Thereby, even if the pressing operation of the operation switch is released, the energization to the microcomputer is continued.

During the combustion operation, the solenoid valve and the control valve are open. In this state, when the dry battery is removed or the dry battery is removed for battery replacement, power is not supplied to the control circuit including the solenoid valve, the electric motor, and the microcomputer. At this time, the solenoid valve loses magnetic force and closes, but the control valve is stopped by stopping the electric motor and remains open.

When the user resets the dry battery, if the control valve is open, the detection switch is set to detect the open state of the control valve. The microcomputer is energized. Then, by causing the microcomputer to perform an operation for improving safety, the safety of the combustion device is improved as compared with the related art. At this time, by adopting the second aspect, the microcomputer supplies the operating power to the electric motor to close the control valve. For this reason, the fuel supply passage is closed by the control valve together with the electromagnetic valve.

On the other hand, if the dry battery is removed by replacing the battery while the operation is stopped and the dry battery is set again, the switch element is not turned on because the detection switch is set to detect the closed state of the control valve. The microcomputer is not energized. Therefore, the life of the dry battery is not shortened.

[0015]

According to the present invention, by using a dry battery as a power source, the price of the combustion apparatus can be reduced, and the combustion apparatus can be easily used even in a place where there is no commercial power supply. In addition, the operation of the operation switch starts the energization of the microcomputer, and the function of stopping the energization of the microcomputer by stopping the combustion operation can extend the life of the dry battery. Even if the microcomputer is reset, the microcomputer is not energized, so that the life of the dry battery can be further extended. Further, when the dry cell is reset when the control valve is in the open state, the microcomputer operates, so that the operation of the microcomputer can enhance the safety of the combustion device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a battery control type combustion apparatus according to the present invention will be described with reference to the drawings based on an embodiment in which the apparatus is applied to a gas reheating apparatus for a bath. [Structure of Embodiment] FIGS. 1 to 5 show an embodiment, and FIG. 2 is a schematic structural view of a gas reheating apparatus. The gas reheating device 10 is roughly divided into a combustor 1 for burning gas (fuel) to heat water or hot water in a bathtub (not shown).
1. Gas supply means 1 for supplying gas to the combustor 11
2 and a control circuit 13 for activating them.

(Explanation of Combustor 11) The combustor 11 includes a pilot burner 14, a main burner 15, a reheating heat exchanger 16, and an exhaust pipe 17. Pilot burner 1
The four burners and the plurality of main burners 15 are provided in parallel, and both are Bunsen burners which blow out gas supplied from the gas supply means 12 from a large number of ejection holes and burn gas by surrounding air. However, the main burner 15 is provided with a large amount of combustion. The pilot burner 14 is a burner that ignites before the main burner 15 and burns to the main burner 15. An ignition plug 18 that ignites the pilot burner 14 is provided near the pilot burner 14.
A thermocouple 19 for detecting the ignition state of the pilot burner 14 is provided.

The reheating heat exchanger 16 exchanges heat between the gas combustion by the pilot burner 14 and the main burner 15 and water (hot water) in the bathtub to heat the water (hot water) in the bathtub. A pipe 21 is connected to the bathtub to guide water (hot water) in the bathtub, and fins 22 increase heat exchange efficiency.

The exhaust pipe 17 is a pipe that collects exhaust gas that has passed through the reheating heat exchanger 16 and discharges the exhaust gas to the outside. A baffle 24 is attached. A first exhaust thermistor 25 is mounted inside the baffle 24, and a second exhaust thermistor 26 is mounted below the baffle 24. It is provided so as to detect the influence due to.

(Explanation of the gas supply means 12) The gas supply means 12 comprises a gas supply path 31, an electromagnetic valve 32, a pilot valve 33, a main valve 34, and a governor valve 35. The gas supply path 31 includes a hose end 36 to which a gas hose or a gas pipe (not shown) for receiving gas supply is connected at one end. The gas supplied from the hose end 36 is supplied to the pilot valve 33 and the main valve 34 via the electromagnetic valve 32. The gas supply passage 31 has a small pilot passage 37 that supplies gas to the pilot burner 14 through the pilot valve 33 and a small passage diameter that supplies gas to the main burner 15 through the main valve 34. It is provided so as to branch into a large main passage 38. The governor valve 35 keeps the pressure of the gas flowing through the main passage 38 constant.

The solenoid valve 32 is a safety valve provided on the upstream side of the gas supply passage 31. The electromagnetic valve 32 is a normally-closed type, and includes, as shown in FIG. 3, a valve element 42 for closing the gas supply path 31 by a spring 41 and an electromagnetic coil 43 for opening the valve element 42. . The electromagnetic coil 43 is energized only at the start of operation to generate a large electromagnetic force, and a magnetic armature 42 provided on the valve body 42 is provided.
a to the iron core 43c to open the valve body 42, and to the armature 42
and a holding coil 43b that keeps a magnetized on the iron core 43c and keeps the valve body 42 open.

The pilot valve 33 and the main valve 34 both correspond to the control valve of the present invention. As shown in FIG. 3, the pilot valve 33 includes a valve body 45 for closing the pilot passage 37 by a spring 44 and a valve body 45 for closing the pilot passage 37. And a pilot valve opening mechanism 46 for opening the valve body 45.

The pilot valve opening mechanism 46 includes a geared motor 47, a cam 48, and a push rod 49. The geared motor 47 drives the rotational force generated by the electric motor 51 to rotate the shaft 53 by a gear train 52 using a plurality of gears. The gear train 52 suppresses the number of rotations generated by the electric motor 51 and reduces the generated torque. It is provided to increase. Note that the shaft 53 including the cam 48 is provided to be rotated by 360 ° by the geared motor 47.

The cam 48 is provided so as to rotate integrally with the shaft 53, and changes the displacement position of the push rod 49 according to the rotation position of the shaft 53. The push rod 49 directly shifts the valve body 45 of the pilot valve 33, and the push rod 49 shifts downward by the cam 48 in FIG.
A valve body 45 is provided to open the pilot passage 37. When the cam 48 is driven to rotate by 360 ° by the geared motor 47, the push rod 49 moves as shown by the solid line A in FIG.

On the other hand, the main valve 34 is, as shown in FIG.
5 and the valve element 55 according to the displacement position of the push rod 49.
And a main valve opening mechanism 56 that opens the valve. The main valve opening mechanism 56 includes a pressing rod 57 attached to the push rod 49 and a pressure receiving cylinder 58 attached to the valve body 55. The pressure receiving cylinder 58 is slidably fitted around a fixed cylinder 59 fixed in the gas supply passage 31, and has an annular rib 58 a pressed by the pressing rod 57 around the circumference. This annular rib 58a
The pressing rod 57 is provided so as to come into contact with the pressing rod 57 after being shifted downward by a predetermined amount in FIG.

Therefore, when the pushing amount of the push rod 49 is small (for example, the rotation angle of the cam 48 is about 100 °).
The pilot valve 33 → opens and the main valve 34 → closes. However, when the push amount of the push rod 49 increases (for example, the rotation angle of the cam 48 is about 260 °), the pilot valve 33 → opens and the main valve 34 → Open (Fig. 4
Solid lines B and C). When the rotation angle of the cam 48 becomes a predetermined angle or more (for example, 295 ° or more), the pressing force of the push rod 49 by the cam 48 is released, and the springs 44 and
4. Pilot valve 33 → closed by action of 4, main valve 3
4 → Closed.

On the other hand, the geared motor 47 is provided with detecting means for detecting the rotational position of the cam 48, that is, the open state of the pilot valve 33 and the main valve 34. This detecting means includes a pilot switch Psw composed of a micro switch, a main switch Msw, and a pilot switch Psw according to the rotational position of the shaft 53.
sw, rotation detection cam 6 for turning ON / OFF the main switch Msw
It consists of 0.

The pilot switch Psw and the main switch Msw correspond to detection switches for detecting the open / closed state of the pilot valve 33 (control valve) and the main valve 34 (control valve). The pilot switch Psw and the main switch Msw determine the rotational position of the cam 48,
That is, depending on the open state of the pilot valve 33 and the main valve 34, the ON-O-O signal is turned on as shown by the solid lines D and E in FIG.
FF (Hi-Low) Changes. That is, as shown in FIG. 4, when the pilot valve 33 and the main switch 34 are open, one of the pilot switch Psw and the main switch Msw is set to the ON (Hi) state.

Specifically, first, the pilot valve 33
When both the main switch 34 and the main valve 34 are closed, only the main switch Msw changes to Hi. When the electric motor 51 operates, the pilot switch Psw also changes to Hi in a state where the pilot valve 33 is reliably opened and the main valve 34 is closed. Next, with the pilot valve 33 and the main valve 34 reliably opened, only the main switch Msw changes to low. Further, the rotation of the cam 48 further proceeds, and the pilot switch Psw also changes to the low state while the pilot valve 33 and the main valve 34 are securely closed.

(Explanation of the control circuit 13)
As shown in FIG. 1, electric functional components (ignition plug 18, suction coil 43 a and holding coil 43 b of electromagnetic coil 43, electric motor 51, combustion confirmation lamp 66 and battery confirmation lamp 67, which will be described later) provided in gas reheating device 10. )
Is an electric circuit using a microcomputer 61 that controls the energization according to an input signal and a control program, and is operated by the power of a dry battery 62.

The control circuit 13 receives the thermocouple 19, the first exhaust thermistor 25, the second
In addition to the exhaust thermistor 26, the pilot switch Psw, and the main switch Msw, signals from an operation switch 64 and a timer volume 65 provided on a remote controller 63 (hereinafter, remote controller) are input.

The control circuit 13 includes an ignition control circuit 13a for applying an operation current to the ignition plug 18 when the microcomputer 61 issues an operation instruction for the ignition plug 18;
When the microcomputer 61 issues a valve closing instruction for the solenoid valve 32, the solenoid valve driving circuit 13b applies an operating current to the solenoid coil 43 for valve opening.
Motor drive circuit 13 for providing an operating current for turning
c, Hi or Low depending on the electromotive force of thermocouple 19
Detection circuit 1 for outputting the signal to the microcomputer 61
3d, the combustion confirmation lamp 66 or the battery confirmation lamp 67 is turned on and blinks according to the output of the microcomputer 61,
A lamp control circuit 13e for turning off the light, an exhaust detection circuit 1 for outputting a voltage corresponding to the resistance values of the first exhaust thermistor 25 and the second exhaust thermistor 26 to the macro computer 61.
3f is provided.

The operation switch 64 is a non-lock type tact switch for instructing activation or stop of the gas reheating device 10 by pressing. Timer volume 6
Reference numeral 5 denotes a variable resistor for setting the reheating time, which determines the number of bits according to the resistance value, and changes one count time according to the number of bits. The microcomputer 61 counts a predetermined number of times (for example, 255 times) irrespective of the number of bits, and sets a timer time by a change in one count time.

The remote controller 63 is installed in the bathroom and operated by a user.
In addition to the timer volume 65, a combustion confirmation lamp 66 for confirming the combustion state and a battery confirmation lamp 67 for confirming the voltage of the dry battery 62 are provided.

The dry cell 62 is a power source in which, for example, two single dry cells are housed in a battery box 68. In addition to the operation of the control circuit 13, the operation of the ignition plug 18, the operation of the electromagnetic coil 43, the operation of the electric motor 51, It is also used when operating the combustion confirmation lamp 66 and the battery confirmation lamp 67.

(Explanation of the power supply control circuit 70) A transistor Tr (corresponding to a switch element of the present invention) which is turned on when the base potential decreases is provided between the dry cell 62 and the microcomputer 61. The microcomputer 61 is provided to be supplied with power via the power supply circuit 69 when the Tr is turned on. The transistor Tr is connected to the power supply control circuit 7.
It is provided to be turned ON by 0.

The energization control circuit 70 includes an operation switch 6
A first ON circuit 71 for turning on the transistor Tr when 4 is turned on, and a second for turning on the transistor Tr in response to a Hi signal (conduction instruction signal) for continuing the energized state of the microcomputer 61 from the microcomputer 61 A third ON circuit 73 that turns ON the transistor Tr when at least one of the ON circuit 72, the pilot valve 33, and the main valve 34 is set to the open state.

The first ON circuit 71, as shown in FIG.
Operation switch 64 connected to the positive electrode side of dry cell 62
When the operation switch 64 is turned on by a pressing operation, the Hi output is inverted by a first inverting circuit 74 to lower the base potential and turn on the transistor Tr. is there. In addition, between the operation switch 64 and the microcomputer 61, the ON of the operation switch 64 is inverted by the second inversion circuit 75, and the fact that the operation switch 64 is turned on is indicated by the microcomputer 61.
Is provided.

The second ON circuit 72 connects the microcomputer 61 and the base of the transistor Tr.
When the microcomputer 61 outputs a Hi signal as an energization instruction signal, the Hi output is inverted by a third inverting circuit 77 to lower the base potential and turn on the transistor Tr.

The third ON circuit 73 is a circuit that connects the base of the transistor Tr and the ground potential via the pilot switch Psw and the main switch Msw, and sets at least one of the pilot switch Psw and the main switch Msw to the ON state. When done, the transistor T
It lowers the base potential of r and turns on the transistor Tr.

(Description of Operation of Gas Reheating Device 10 by Basic Operation of Control Circuit 13) Here, the basic operation of the control circuit 13 will be described with reference to the flowchart of FIG. When the operation switch 64 is turned on, a Hi signal is generated in the first ON circuit 71 of the conduction control circuit 70 to turn on the transistor Tr, and the microcomputer 61 is energized. When the power supply to the microcomputer 61 is started, the microcomputer 61 outputs a Hi signal to the second ON circuit 72 of the conduction control circuit 70, and maintains the transistor Tr in the ON state. As a result, the energized state of the microcomputer 61 is maintained even if the pressing operation of the operation switch 64 is released (start).

It is determined whether or not the reheating time is set by the timer volume 65 (step S1).
). If the determination result is NO, the operation switch 64
After N, it is determined whether a predetermined time (for example, 5 seconds) has elapsed (step S2). If the determination result is NO, the process returns to step S1. If the determination result is YES (the timer has not been set for a predetermined time even if the operation switch 64 is turned ON), the operation switch 64 is turned ON due to erroneous operation.
As a result, the microcomputer 61 outputs a low signal to the energization control circuit 70, turns off the transistor Tr, stops the energization of the microcomputer 61, and ends (step S3).

If the decision result in the step S1 is YES,
The ignition plug 18 is turned on (step S4). continue,
The electric motor 51 is turned on to open only the pilot valve 33 (step S5). Next, it is determined whether the electric motor 51 operates to open the pilot valve 33, that is, whether the pilot switch Psw has changed to Hi (step S6). If this determination is NO,
Returning to step S6, the electric motor 51 is turned on until the pilot switch Psw changes to Hi.

If the decision result in the step S6 is YES,
When it is determined that the pilot valve 33 has been opened, the electric motor 51 is turned off (step S7). Next, the electromagnetic coil 4
3 (specifically, both the suction coil 43a and the holding coil 43b are initially turned on, and then the suction coil 43a is turned on).
Only a is turned off, step S8).

Next, it is determined whether ignition has been detected in the pilot burner 14, that is, whether the electromotive force of the thermocouple 19 provided near the pilot burner 14 has exceeded a predetermined value (step S9). The result of this judgment
In the case of NO, it is determined whether a predetermined time (for example, 25 seconds) has elapsed after the electromagnetic coil 43 is turned on (step S).
Ten). If the result of this determination is NO, it is determined that the predetermined time has not elapsed and the process returns to step S9. If the result of the determination in step S9 is YES, it is determined that ignition has been confirmed, and the ignition plug 18 is turned off (step S11).

Subsequently, the electric motor 51 is turned on to open the main valve 34 (step S12). Next, it is determined whether the main valve 34 has been opened, that is, whether the main switch Msw has changed to Low (step S13). If this determination is NO, the process returns to step S13. If the decision result in the step S13 is YES, it is determined that the main valve 34 is also opened, and the electric motor 51 is turned off.
(Step S14). Note that the steps S13 and S14
, The combustion of gas in the main burner 15 starts, and the combustion of the pilot burner 14 and the main burner 15 heats the water (hot water) in the bath tub led into the pipe 21 of the reheating heat exchanger 16. I do.

Next, after the ignition is detected, the timer volume 6
It is determined whether or not the reheating time set in Step 5 has elapsed (Step S15). If this determination is NO,
It is determined that the reheating time has not elapsed, and the process returns to step S15. If the result of this determination is YES, it is determined that the reheating time has elapsed and the operation shifts to fire extinguishing operation. That is, first, the electromagnetic coil 43 is turned off (specifically, the attraction coil 43
a has already been turned off, and the holding coil 43b is turned off (step S16).

Next, it is determined whether fire extinguishing has been detected, that is, whether the electromotive force of the thermocouple 19 has dropped below a predetermined value (step S17). If this determination is NO,
After the electromagnetic coil 43 is turned off, a predetermined time (for example, 120
Second) is determined (step S18). If the result of this determination is NO, it is determined that the fire has not been extinguished and the process returns to step S17. If the decision result in the step S17 is YES, it is determined that the fire extinguishing has been confirmed, and the pilot valve 3
The electric motor 51 is turned on to close the third valve 3 and the main valve 34 (step S19).

Next, whether the pilot valve 33 and the main valve 34 are closed,
It is determined whether sw has changed to Low (step S2).
0). If this determination is NO, the process returns to step S20. If the decision result in the step S20 is YES, it is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S21). As described above, since all the reheating operations have been completed and the state has been returned to the state before the start of operation, the microcomputer 61 outputs a Low signal to the energization control circuit 70, turns off the transistor Tr and stops energization of the microcomputer 61. Then, the process ends (step S22).

On the other hand, if the decision result in the step S10 is YES, that is, if ignition is not detected within 25 seconds after the start of ignition, it is determined that an ignition mistake has occurred, the ignition operation is terminated, and the gas reheating device The operation of returning the motor 10 to a position before the start of operation is performed.
That is, first, the electromagnetic coil 43 is turned off (as described above, the suction coil 43a is already turned off, and the holding coil 43b is turned off, step S23), and the ignition plug 18 is turned off (step S24). Subsequently, the electric motor 51 is closed to close the pilot valve 33.
Turn on (step S25).

Thereafter, it is determined whether the pilot valve 33 has been closed, that is, whether the pilot switch Psw has changed to Low (step S26). Since the rotation direction of the electric motor 51 is constant, the main valve 34 opens and closes before the pilot valve 33 closes. If the decision result in the step S26 is NO, the process returns to the step S26. If the decision result in the step S26 is YES, it is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S27). As described above, the microcomputer 61 is returned to the state before the start of operation.
A signal w is output, the transistor Tr is turned off, the energization of the microcomputer 61 is stopped, and the process ends (step S28).

If the determination result of step S18 is YES, that is, if the extinguishing is not detected within 120 seconds after the electromagnetic coil 43 is turned off, it is determined that the electromagnetic coil 43 has a problem and cannot be extinguished. , Pilot valve 33
Then, the fire is extinguished by the main valve 34 to display an abnormality. That is, first, the electric motor 51 is turned on to close the pilot valve 33 and the main valve 34 (step S29). Next, it is determined whether the pilot valve 33 and the main valve 34 have been closed, that is, whether the pilot switch Psw has changed to Low (step S30). If this determination is NO, the process returns to step S30.

If the decision result in the step S30 is YES,
It is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S3).
1). Then, the fact that a problem has occurred in the solenoid valve 32 (error display) is indicated by a combustion confirmation lamp 6 provided on the remote controller 63.
6 and the battery confirmation lamp 67 is displayed to the user (for example, the combustion confirmation lamp 66 and the battery confirmation lamp 67 are used as indicators, and both the combustion confirmation lamp 66 and the battery confirmation lamp 67 are turned on for 1 second, and 1 second. Step S is repeated to display a message indicating that the solenoid valve 32 cannot be closed.
32).

When the operation switch 64 is turned on again after the start of the operation and before the end of the operation, that is, when an instruction to stop the operation is given, if both the pilot switch Psw and the main switch Msw are low, If the power is turned off as it is and the processing is ended, and if both the pilot switch Psw and the main switch Msw are not Low, step S
After performing the fire extinguishing operation, the microcomputer 61 returns to the state before the operation started, and the microcomputer 61
A low signal is output, the transistor Tr is turned off, the power supply to the microcomputer 61 is stopped, and the operation is terminated.

(Explanation of Automatic Valve Closing Means 78) When power is started, the microcomputer 61 detects the ON / OFF state of the pilot switch Psw and the main switch Msw, and sets at least one of the switches. When the state is the ON state (Hi state), it is determined that at least one of the pilot valve 33 and the main valve 34 is open, and until the pilot switch Psw and the main switch Msw are both turned OFF (Low state). ,
That is, the pilot valve 33 and the main valve 34
Until both are closed, automatic valve closing means 78 for supplying electric power to the electric motor 51 for operation is programmed.

The operation of the automatic valve closing means 78 will be described. During the reheating operation, the solenoid valve 32 and the pilot valve 3
3 and the main valve 34 are open for gas supply. In this state, when the dry battery 62 is removed from the battery box 68 or when the dry battery 62 is removed from the battery box 68 for battery replacement, the control circuit 13 including the solenoid valve 32, the electric motor 51, and the microcomputer 61 Is no longer supplied with power. At this time, the solenoid valve 32 loses magnetic force and closes.
The electric motor 51 stops and the main valve 34 stops with the valve open.

When the user resets the dry battery 62 in the battery box 68, if at least one of the pilot valve 33 and the main valve 34 is open, at least one of the pilot switch Psw and the main switch Msw is turned on. Is set. in this way,
When at least one of the pilot switch Psw and the main switch Msw is set to the ON state, the base of the transistor Tr is grounded by the third ON circuit 73 of the conduction control circuit 70, and the transistor Tr is turned ON. The microcomputer 61 is energized.

When energization of the microcomputer 61 is started, when at least one of the pilot switch Psw and the main switch Msw is set to the ON state, the microcomputer 61 controls the pilot valve by the automatic valve closing means 78. Until both the switch Psw and the main switch Msw are in the OFF state (Low state),
The electric motor 51 is operated. As a result, when at least one of the pilot valve 33 and the main valve 34 is open when the dry battery 62 is reset in the battery box 68, the pilot valve 33 and the main valve 34 are automatically closed. Become. That is, since the solenoid valve 32, the pilot valve 33, and the main valve 34 are all in the closed state, high safety can be ensured.

On the other hand, when the dry battery 62 is removed from the battery box 68 by replacing the battery while the gas reheating device 10 is stopped, and the dry battery 62 is reset in the battery box 68 again,
Since the pilot valve 33 and the main valve 34 are closed, both the pilot switch Psw and the main switch Msw are set to the OFF state. Therefore, the third ON circuit 73 does not turn on the transistor Tr, and as a result, the microcomputer 61 is not energized. Thus, the pilot valve 33 and the main valve 34
Even if the dry battery 62 is replaced while the valve is closed, the microcomputer 61 is not energized, so that the consumption of the dry battery 62 can be suppressed and the problem of shortening the life of the dry battery 62 can be prevented.

[Effects of Embodiment] As described above, the gas reheating device 10 of the present embodiment can reduce the price of the gas reheating device 10 by using the dry battery 62 as a power source, and The gas reheating device 10 can be easily used even in a place where there is no power supply. When the operation of the operation switch 64 is pressed, the energization of the microcomputer 61 is started, and the life of the dry battery 62 can be extended by the function of stopping the energization of the microcomputer 61 by stopping the reheating operation.

Further, even if the dry battery 62 is reset while the pilot valve 33 and the main valve 34 are not open, the microcomputer 61 is not energized, so that the life of the dry battery 62 can be further extended.
The pilot valve 33 or the main valve 34
When the dry battery 62 is reset while at least one of the two is open, the third ON circuit 73 that energizes the microcomputer 61 connects the pilot switch Psw and the main switch Msw between the transistor Tr and the ground potential. It is composed of a simple circuit connected with interposition. Therefore, the electric circuit does not become complicated.

When the dry battery 62 is reset while the pilot valve 33 and the main valve 34 are open, the operation of the automatic valve closing means 78 programmed in the microcomputer 61 causes the pilot valve 33 and the main valve 34 to operate. The valve 34 is closed. As described above, since the pilot valve 33 and the main valve 34 are closed together with the electromagnetic valve 32, the closeability of the gas supply passage 31 is improved, and the safety of the gas reheating device 10 can be improved.

[Modification] In the above-described embodiment, when the control valve is opened when the dry battery is reset, the microcomputer is operated by energizing to automatically close the control valve. The safety may be improved by operating the microcomputer to notify the user using an alarm sound or a lamp.

In the above embodiment, an example in which the present invention is applied to a gas reheating device is shown.
It may be applied to other gas combustion devices, such as a battery-controlled combustion device that burns with a liquid fuel such as kerosene,
The present invention is applicable to all other battery-controlled combustion devices having a control valve operated by an electric motor and a solenoid valve opened by energization in series.

Although the battery-controlled combustion device provided with two control valves operated by an electric motor has been described as an example, the battery-controlled combustion device having one control valve operated by the electric motor, or three or more control valves are operated. The present invention is applicable even to a battery-controlled combustion device. The numerical values shown in the above embodiments are examples for describing the embodiments, and can be changed as appropriate.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit and an electric circuit diagram of a conduction control circuit.

FIG. 2 is a schematic configuration diagram of a gas reheating device.

FIG. 3 is a sectional view showing a main part of a gas supply path.

FIG. 4 is a chart showing the rotation angle of a cam and the operation of each part.

FIG. 5 is a flowchart showing a basic operation of the control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas reheating apparatus (battery control combustion apparatus) 11 Combustor 12 Gas supply means 13 Control circuit 14 Pilot burner 15 Main burner 31 Gas supply path (Fuel supply path) 32 Solenoid valve 33 Pilot valve (Control valve) 34 Main valve (Control valve) 51 Electric motor 61 Microcomputer 62 Dry cell 64 Operation switch 70 Current control circuit 78 Automatic valve closing means Tr Transistor (switch element) Psw Pilot switch (detection switch) Msw Main switch (detection switch)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Atsushi Ando 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya-shi Inside Linhai Corporation (56) References JP-A-6-221671 (JP, A) JP-A-4- 48116 (JP, A) JP-A-7-78003 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 1/00 102 F23N 5/24 110

Claims (2)

(57) [Claims] A burner for burning fuel; a fuel supply passage for supplying fuel to the burner; a fuel supply passage provided in the fuel supply passage; An electromagnetic valve that closes the fuel supply path in the opened state, a control valve that is provided in series with the electromagnetic valve, and supplies and shuts off fuel to the burner in accordance with rotation of an electric motor; and opening and closing of the control valve. A detection switch for detecting a state, a non-locking type operation switch for instructing start of operation, a control circuit having a microcomputer for controlling the energization of the solenoid valve and the electric motor, and supplying power to the control circuit. A dry battery for supplying operating power to the solenoid valve and the electric motor, and a switch element interposed between the dry battery and the microcomputer. An energization control circuit for controlling the supply of operating power to the microcomputer, the energization control circuit comprising: (a) when the operation switch is turned on; and (b) when receiving an energization instruction signal from the microcomputer. (C) The battery control type combustion device, wherein the switch element is turned on when the detection switch detects an open state of the control valve. 2. The battery-controlled combustion device according to claim 1, wherein the microcomputer detects a setting state of the detection switch when energization is started, and the setting state corresponds to an opening state of the control valve. In this case, the electric power for operation is supplied to the electric motor until the control valve is closed.