JPH0759976B2 - Gas supply system controller - Google Patents

Description

The present invention relates to a gas supply system control device, and in particular,
The present invention relates to a gas supply system control device for home use.

[Prior Art] Conventionally, this main gas supply system control device is provided with a solenoid valve which is normally closed and opens under a predetermined condition at an upstream portion of a main pipe whose upstream end is connected to a gas supply source. A pressure monitoring device with a pressure switch that opens and closes in response to fluctuations in the gas pressure in the pipe is installed on the downstream side of the valve, and the gas appliance also has a cock switch that opens and closes in conjunction with the opening and closing of the cock, and burner combustion. A frame rod for detecting the presence / absence is provided, and the output signals of the pressure switch, cock switch, and frame rod are combined and processed in the control panel, and the solenoid valve is energized only when necessary to direct gas to the downstream side of this solenoid valve. Various products that can be supplied have been proposed.

Further, in the above-mentioned conventional gas supply system control device, the flame rod always applies an AC voltage between the flame rod and the burner, and when a flame is interposed therebetween, a DC voltage is generated by the rectifying action of the flame. As such, combustion is detected in the presence of a DC voltage rectified by the flame.

In addition, the above conventional gas supply system control device, in principle,
The solenoid valve is energized only when the cock is opened and the flame rod detects combustion, but even if the cock is opened without using gas, the flame rod cannot instantly detect combustion, so It is considered that the flame rod has detected combustion for a predetermined time after opening, and the solenoid valve is energized even if combustion is not detected exceptionally.

Further, in the above conventional gas supply system control device, normally, when a sudden decrease in gas pressure in the pipe is recognized after closing the cock by the pressure monitoring device on the control panel, the lock that locks the solenoid valve so that it does not open. A circuit, an alarm indicator light indicating that the lock circuit has been activated, and a reset switch for releasing the lock circuit are housed.

[Problems to be Solved by the Invention] However, in the conventional method in which an alternating current voltage is constantly applied between the frame rod and the burner, the user may touch this part, and the voltage may be applied. Had a shortcoming that it had a risk because the response time was short and reliable combustion detection was not possible unless the voltage was comparatively high at about AC70V.

In addition, the method of energizing the solenoid valve even if combustion is not detected exceptionally, the time is relatively short from several seconds to several seconds, so it cannot be said that there is a danger in normal use, The raw gas is allowed to leak out for a certain period of time, and there is a drawback that there is no danger when the burner is locally used in a semi-sealed state.

Furthermore, the method of arranging the lock circuit, the alarm indicator light and the reset switch on the control panel does not cause any problem if the gas appliance used is near the control panel, but the control panel is installed in the kitchen and the bath burner is installed. If the gas appliance that is trying to ignite is located far from the control panel installation position, it may not be possible to confirm that the lock circuit is operating and there is a disadvantage that the gas appliance may continue to be operated without meaning. Was.

[Purpose] Therefore, the present invention has been made in view of the above-mentioned drawbacks. Voltage is not always applied to the frame rod, and the voltage is applied only when the cock is opened without using gas, and even if a high voltage is applied, it is dangerous. In addition, since combustion is not detected and high-voltage is applied to the flame rod without danger, the response time is short and combustion can be detected reliably. By significantly shortening the time when the valve is exceptionally opened, minimizing the time when raw gas may leak, and by arranging the alarm indicator light and the reset switch on the gas appliance side, An object of the present invention is to provide a gas supply system control device having high safety and good operability.

[Means for Solving the Problem] In order to solve the above-mentioned problems, the configuration of the present invention, which has the above-mentioned claims as its gist, is in accordance with the above-mentioned object, and the main end of the main pipe 1 is connected to the gas supply source. A main solenoid valve 3 which is normally closed and opened under a predetermined condition is provided in the upstream portion, and a sub solenoid valve 4 which is also normally closed and opened under a predetermined condition is provided on the downstream side of the main pipe 1. An auxiliary pipe 1a is provided on the downstream side of the valve 4.
A gas appliance 2 having a burner 2'is connected to the main pipe 1 at a portion between the main solenoid valve 3 and the sub solenoid valve 4 of the main pipe 1, which is opened / closed in response to a change in gas pressure in the pipe. switch
A sub-pressure switch SS that opens and closes the main pressure monitoring device 5 having an MS at the portion between the sub-electromagnetic valve 4 of the sub-pipe 1a and the cock 7 of the gas appliance 2 in response to the fluctuation of the gas pressure in the pipe. The auxiliary pressure monitoring device 6 having the above is installed, and the gas appliance 2 has a cock switch SW1 which opens and closes in conjunction with opening and closing of the cock 7, an igniter IG for igniting the burner 2 ', and a burner 2'. A flame rod FA for detecting the presence or absence of combustion of the gas, an alarm indicator lamp 9, and a reset switch 9'are provided, and the gas appliance 2 further includes a cock between the DC power input end 11 and the flame rod FA. When the switch 7 is opened, the cock switch SW1 supplies a DC power source to the frame rod FA side, and a frame rod power source switching circuit 12 is provided between the frame rod power source switching circuit 12 and the frame rod FA to supply a predetermined DC power source. AC power Converted to a and a AC inverter 13 to be applied between the flame rod FA and burner 2 ', further, the AC inverter 13 and the flame rod
At the midpoint A of either the circuit C1 or C2 connecting the FA or the burner 2 ', the flame F exists between the flame rod FA and the burner 2'at the DC signal generated by the flame signal output terminal 15. Flame detection circuit 14 that outputs a combustion signal
And a cock signal output end 16 for outputting a cock opening / closing signal when the cock 7 is opened / closed, and a cock signal input connected to the cock signal output end 16 of the sub control board P '. End 16a and flame signal output end 1 of the sub control panel P '
Flame signal input end 15a connected to 5 and reset switch 9b
A reset signal input terminal 9'a connected to the main pressure monitoring apparatus 5, a main pressure signal input terminal 5a connected to the main pressure monitoring apparatus 5, and a sub pressure signal input terminal 6a connected to the sub pressure monitoring apparatus 6. Furthermore, an instantaneous valve opening signal output circuit 21 that is connected to the cock signal input end 16a and outputs a valve opening signal only when the cock opening signal is input, and is connected to the cock signal input end 16a and the flame signal input end 15a. A combustion determination circuit 22 that outputs an energization signal to the igniter IG when a cock open signal is input and a combustion signal is not input, and outputs a valve open signal when both a cock open signal and a combustion signal are input, and this combustion determination circuit 22 and the momentary valve opening signal output circuit 21, and when the valve opening signal is input from either one of them, the main solenoid valve 3 and the sub solenoid valve 4 are connected only while the valve opening signal is being input. Main control that houses solenoid valve open / close circuit 23 that is open A board P is provided, and a cock 7 is provided between the solenoid valve opening / closing circuit 23 and the sub solenoid valve 4.
A contact SW2 that is closed when opened is interposed in series, and further, a timer circuit 24 that outputs a timer signal to the main control panel P that starts when the use of gas is finished and after a predetermined time from the start, The timer circuit 24, the main pressure monitoring device 5, and the auxiliary pressure monitoring device 6 are connected to each other, and when a pressure drop signal is input from the main pressure monitoring device 5 before a predetermined time from the start time of the timer circuit 24, the first lock circuit. 26, the combustion determination circuit 22 is set to a state in which no combustion signal is output, the instantaneous valve opening signal output circuit 21 is set to a state in which a valve opening signal is not output, or the solenoid valve opening / closing circuit 23 is set to the main solenoid valve 3
When the alarm signal lamp 9 is energized by locking the auxiliary solenoid valve 4 in a non-energized state, and a pressure drop signal is input from the main pressure monitoring device 5 after a predetermined time from the start of the timer circuit 24, the second Combustion judgment circuit via lock circuit 27
22 is locked to a state where no combustion signal is output, the instantaneous valve opening signal output circuit 21 is locked to a state where a valve opening signal is not output, or the solenoid valve opening / closing circuit 23 is locked to a state where the main solenoid valve 3 and the sub solenoid valve 4 are not energized. And a pressure monitoring circuit 25 for energizing the alarm indicator lamp 9 and a reset switch 9'for resetting the lock signal output of the second lock circuit 27 is connected to the second lock circuit 27. It is a measure that has been taken.

"Operation" Next, the operation of the present gas supply system control device will be described for each usage state.

a, Normal use state When the gas is used normally and the use of the gas is finished without any abnormality, first, the cock 7 is opened without using the gas appliance 2, and the cock is output from the cock signal output end 16 of the sub control panel P '. An open signal is output, and this cock open signal is output via the cock signal input end 16a of the main control panel P to the instantaneous valve open signal output circuit 21.
Further, the output of the momentary valve opening signal output circuit 21 actuates the solenoid valve opening / closing circuit 23 instantaneously (0.8 seconds in the embodiment) to energize the main solenoid valve 3 and the sub solenoid valve 4.

If the combustion is not generated even when the cock 7 is opened, the combustion open signal is not input to the control panel P, so the energization signal is output from the combustion determination circuit 22 to the igniter IG and the burner 2'is ignited. .

Then, the igniter IG ignites the combustion determination circuit 22.
When the cock 7 is open and combustion is detected, the igniter IG is turned off and instead an electromagnetic valve open signal is output to the electromagnetic valve opening / closing circuit 23. During this electromagnetic valve open signal is being output, the main electromagnetic valve is opened. 3 and the sub solenoid valve 4 are held in the open state. The electromagnetic valve open signal of the combustion determination circuit 22 may be during the output of the valve open signal of the instantaneous valve open signal output circuit 21 or after the output is stopped, and in the auxiliary pipe 1a even after the auxiliary electromagnetic valve 4 is closed. Since the combustion continues with the residual gas for some time, it is sufficient that the combustion determination circuit 22 detects the combustion within the time when the combustion can continue.

If the cock 7 is closed to stop using the gas, the combustion determination circuit 22 loses neither the combustion signal nor the cock opening signal.
And the sub solenoid valve 4 are closed.

b, Disappearance state Next, when the cock 7 was opened and combustion started normally once, but if the extinguishment suddenly occurred while using the gas, the cock open signal continued to be input to the combustion judgment circuit 22, but it disappeared. At the same time, the combustion signal input stops, so the solenoid valve opening / closing circuit
23 has the function of closing the main solenoid valve 3 and the sub solenoid valve 4.

c, State where the cock is opened and ignition has failed In this case, since the combustion signal is not input to the combustion determination circuit 22, the solenoid valve opening / closing circuit 23 uses the instantaneous valve opening signal output circuit.
The main solenoid valve 3 and the sub solenoid valve 4 are opened only at the moment when the valve opening signal from 21 is input, and after that, the main solenoid valve 3 and the sub solenoid valve 4 are kept closed. To work.

d, The state where the gas pressure inside the pipe has decreased The decrease in the gas pressure inside the pipe occurs due to various causes, and a large amount of leakage occurs when the pipe is dropped for a short time, causing cracks or pinholes in the pipe and causing a small amount of leakage over a long period of time. Although there is no leakage, it can be assumed that the gas pressure inside the pipe drops due to a sudden decrease in the ambient temperature.

Therefore, in the present invention, the danger is judged and dealt with by the decrease in the gas pressure in the pipe at the time when a predetermined time elapses starting from the time when the cock 7 is closed.

d-1, The state where the pressure drop signal is input before the elapse of the predetermined time.

It is considered that the reason why the gas pressure inside the pipe decreases before the predetermined time (1.6 seconds in the embodiment) is that there is a considerably large gas leak cause such as pipe drop, so in this case, combustion occurs via the first lock circuit 26. The judgment circuit 22 is locked in a state in which a combustion signal is not output, and the instantaneous valve opening signal output circuit 21 is locked in a state in which a valve opening signal is not output, that is, the function of the main control panel P is electrically locked and the gas supply system cannot be used. Moreover, since the first lock circuit 26 is not provided with a reset switch, the lock cannot be released, and the gas locker must be called for inspection and repair. Although this state can be confirmed by the alarm indicator lamp 9, the illustrated embodiment is designed to display two types of alarms with one alarm indicator lamp 9. In this case, the alarm indicator lamp 9 blinks-turns off- The blinking is repeated, and the alarms described later are distinguished only by blinking.

d-2, The state where the pressure drop signal is input after the lapse of the predetermined time.

It is not dangerous for the gas pressure inside the pipe to drop after a predetermined time because pinholes, cracks, etc. occur in the pipe, but there is a risk of an accident if left unattended. Therefore, in this case, the combustion determination circuit 22 is locked via the second lock circuit 27 to the state in which the combustion signal is not output and the instantaneous valve opening signal output circuit 21 is locked in the state in which the valve opening signal is not output. Two lock circuit 27
Since the reset switch 9'is connected to the user, the user confirms with the warning indicator light 9 and the lock is reset switch 9 '.
It has the effect of being released by the procedure described above so that the gas can be used.

[Examples] Next, examples of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 is a main pipe, and a main solenoid valve 3 which is normally closed and is opened under a predetermined condition is provided at an upstream portion of the main pipe 1 whose upstream end is connected to a gas supply source. Is also provided with a sub solenoid valve 4 which is normally closed and opened under a predetermined condition, and a gas appliance 2 having a burner 2'is connected to the downstream side of the sub solenoid valve 4 via a sub pipe 1a. Although the above gas supply source is not shown, it goes without saying that a gas cylinder is connected in the case of propane gas, and an outlet of a gas meter is connected to the upstream end of the main pipe 1 in the case of city gas. In the case where 1 is branched and used, the auxiliary solenoid valve 4 is arranged downstream of the branch point of the main pipe 1.

A main pressure monitoring device 5 having a main pressure switch MS that opens and closes in response to fluctuations in the gas pressure in the pipe is provided in a portion of the main pipe 1 between the main solenoid valve 3 and the sub solenoid valve 4. Piping 1a
A sub-pressure monitoring device 6 having a sub-pressure switch SS that opens and closes in response to the fluctuation of the gas pressure in the pipe is also interposed between the sub-solenoid valve 4 and the cock 7 of the gas appliance 2. The main pressure monitoring device 5 and the sub pressure monitoring device 6 may be conventionally known ones, and although not shown in the present embodiment,
The main pressure monitoring device 5 (the sub-pressure monitoring device 6 has the same structure) is provided with a diaphragm storage chamber that is branched to the main pipe 1, receives the gas pressure in the inside of this diaphragm storage chamber on one side, and the inside gas on the other side. A spring that keeps balance with the pressure is provided, and a rod having a permanent magnet at the tip is planted on the other surface side of this diaphragm.Furthermore, at a suitable fixed portion where the permanent magnet moves in the contacting and separating direction. A main pressure switch MS, which is a reed switch that opens and closes depending on the contact and separation of the permanent magnet, is used. The main pressure monitoring device 5 and the sub pressure monitoring device 6 switch when the gas pressure drops below a certain level. It suffices to be able to detect it by opening and closing, and a method of electrically processing and detecting a change in resistance value due to strain change due to the gas pressure of the strain gauge may be used.

And, in the gas appliance 2, a cock switch SW1 which opens and closes in conjunction with opening and closing of the cock 7, an igniter IG for igniting the burner 2 ', and a frame rod FA which detects the presence or absence of combustion of the burner 2'. An alarm indicator light 9 and a reset switch 9'are provided. This cock switch
The SW1, igniter IG, frame rod FA, alarm indicator lamp 9, and reset switch 9'can be conventionally known ones, so that the illustration and description of the specific structure will be omitted. In addition,
When the main pipe 1 is branched and the gas appliances 2 are connected to the auxiliary pipes 1a as in the example of FIG. 1, the cock switch SW1, the igniter IG. Frame rod FA, the alarm indicator light 9 and the reset switch 9'are respectively provided. Is to be installed in.

Further, in the gas appliance 2, between the DC power input end 11 and the frame rod FA, when the cock 7 is opened, a frame rod power supply switching circuit 12 for supplying DC power to the frame rod FA side by the cock switch SW1, There is an AC inverter 13 interposed between the frame rod power supply switching circuit 12 and the frame rod FA for converting the supplied DC power supply into a predetermined AC power supply and applying it between the frame rod FA and the burner 2 '. In addition, the AC inverter 13 and frame rod
At the midpoint A of either the circuit C1 or C2 connecting the FA or the burner 2 ', the flame F exists between the flame rod FA and the burner 2'at the DC signal generated by the flame signal output terminal 15. Flame detection circuit 14 that outputs a combustion signal
And a sub-control panel P'having a cock signal output end 16 for outputting a cock opening / closing signal when the cock 7 is opened / closed.

The frame rod FA and the flame detection circuit 14 are well known in the prior art. When the AC power is applied between the frame rod FA and the burner 2'and the flame F intervenes between them, the flame F is rectified. Then, since a DC voltage is generated at the intermediate point A, the FET transistor provided in the flame detection circuit 14 should be operated by this DC voltage. Conventionally, a commercial power source was transformed by a control panel into an AC power source applied between the frame rod FA and the burner 2'and supplied from the control panel through a conductor wire. Until the frame rod power supply opening / closing circuit 12 is opened and closed, and the cock switch SW1 is opened, the transistor in the frame rod power supply opening / closing circuit 12 is activated to operate the DC power supply on the frame rod FA side. That is, the power is supplied to the AC inverter 13. It is needless to say that a conventionally known AC inverter that converts a DC voltage into a predetermined AC voltage is used.

A cock signal input end 16a connected to the cock signal output end 16 of the sub control board P'and a flame signal output end 1 of the sub control board P '.
Flame signal input end 15a connected to 5 and reset switch 9b
A reset signal input terminal 9'a connected to the main pressure monitoring apparatus 5, a main pressure signal input terminal 5a connected to the main pressure monitoring apparatus 5, and a sub pressure signal input terminal 6a connected to the sub pressure monitoring apparatus 6. Furthermore, an instantaneous valve opening signal output circuit 21 that is connected to the cock signal input end 16a and outputs a valve opening signal only when the cock opening signal is input, and is connected to the cock signal input end 16a and the flame signal input end 15a. A combustion determination circuit 22 that outputs an energization signal to the igniter IG when a cock open signal is input and a combustion signal is not input, and outputs a valve open signal when both a cock open signal and a combustion signal are input, and this combustion determination circuit 2 and the instantaneous valve opening signal output circuit 21, and when the valve opening signal is input from either one of them, the main solenoid valve 3 and the sub solenoid valve 4 are connected only while the valve opening signal is being input. A master system that houses the open / close solenoid valve opening / closing circuit 23 It is provided with a board P.

The combustion determination circuit 22 and the solenoid valve opening / closing circuit 23 can be easily realized by combining a logic circuit according to a conventional technique, and the instantaneous valve opening signal output circuit 21 is instantaneous (0.5 seconds in the embodiment). It can be easily realized by a timer circuit including a resistor and a capacitor for obtaining the output of.

A contact SW2 that closes when the cock 7 is opened is interposed in series between the solenoid valve opening / closing circuit 23 and the sub solenoid valve 4. That is, the condition that the main solenoid valve 3 is directly controlled by the solenoid valve opening / closing circuit 23, but the sub solenoid valve 4 is not energized unless the cock 7 is opened. This condition is that when the main pipe 1 is branched and used, only the sub solenoid valve 4 for the gas appliance 2 with the cock 7 opened is opened and the sub solenoid valve 4 connected to another gas appliance 2 is kept closed. In the illustrated example, as shown in FIG. 3, the cock switch SW1
With the output of, the transistor TR1 is activated to open / close the contact SW2.

Further, on the main control panel P, a timer circuit 24 that starts when the use of gas is finished and outputs a timer signal after a predetermined time from the start, the timer circuit 24, the main pressure monitoring device 5, and the auxiliary pressure monitoring. When a pressure drop signal is input from the main pressure monitoring device 5 before the start of the timer circuit 24 and before the start of the timer circuit 24, the combustion determination circuit 22 does not output a combustion signal via the first lock circuit 26. State, or the momentary valve opening signal output circuit 21 does not output the valve opening signal, or the solenoid valve opening / closing circuit 23 is set to the main solenoid valve 3
When the alarm signal lamp 9 is energized by locking the auxiliary solenoid valve 4 in a non-energized state, and a pressure drop signal is input from the main pressure monitoring device 5 after a predetermined time from the start of the timer circuit 24, the second Combustion judgment circuit via lock circuit 27
22 is locked to a state where no combustion signal is output, the instantaneous valve opening signal output circuit 21 is locked to a state where a valve opening signal is not output, or the solenoid valve opening / closing circuit 23 is locked to a state where the main solenoid valve 3 and the sub solenoid valve 4 are not energized. Then, a pipe pressure monitoring circuit 25 for energizing the alarm indicator lamp 9 is housed, and a reset switch 9'for resetting the lock signal output of the second lock circuit 27 is connected to the second lock circuit 27.

Timer circuit 24 that starts when the above gas is used
The timer circuit 24 itself may be a publicly known one, but it detects when the gas has been used by stopping the combustion signal in the illustrated example. That is, when the input of the combustion signal is cut off, it is judged that the gas use is completed, but separately from this, the main solenoid valve 3 is closed or the cock switch 7 is closed, and the main pipe 1 is branched. In this case, it may be considered that the use of gas has ended because all the cock switches 7 have been closed.

Then, the timer circuit 24 is designed to output a timer signal after a predetermined time from the start, and this predetermined time is set to 1.6 seconds as an example, but in addition, actually from this predetermined time The timer signal is output even after a relatively long time (10 minutes after the start time as an example). That is, when a pressure drop signal is input from the main pressure monitoring device 5 before a predetermined time from the start of the timer circuit 24, the combustion determination circuit 22 is momentarily opened to a state in which the combustion signal is not output via the first lock circuit 26. The signal output circuit 21 is locked in a state where the valve open signal is not output, the alarm indicator lamp 9 is energized, and a pressure drop signal is input from the main pressure monitoring device 5 after a predetermined time from the start of the timer circuit 24. By locking the combustion determination circuit 22 through the second lock circuit 27 in a state in which no combustion signal is output and the instantaneous valve opening signal output circuit 21 in a state in which a valve opening signal is not output and energizing the alarm indicator lamp 9, Whether or not there is a gas leak from the pipe can be determined, and as described above, the display method of the alarm indicator lamp 9 is changed by inputting a pressure drop signal before and after a predetermined time (using a plurality of alarm indicator lamps. Of course By not supporting it, it will be possible to judge the degree of gas leakage, but
The reason why the timer signal is output even after a relatively long time is that when the pressure drop signal is input after this point, only the warning indicator light 9 is displayed and the lock is not performed. Although there is no direct risk, it is displayed that the gas pressure in the sub-pipe 1a is decreasing. Needless to say, this display is not mandatory, but when this display is often displayed even though this display was not made in the conventional gas use, very slight leakage, such as aging of the used rubber hose, etc. Therefore, it is possible to notify that it is time to check the piping.

[Advantages of the Invention] The present invention is as described above, and the gas appliance 2 has a DC power input terminal.
When the cock 7 is opened between 11 and the frame rod FA, the frame rod power supply opening / closing circuit 12 that supplies DC power to the frame rod FA side by the cock switch SW1 and the frame rod power supply opening / closing circuit 12 and the frame rod FA By providing the sub control panel P ′ having the AC inverter 13 which is interposed between the frame rod FA and the burner 2 ′ for converting the supplied DC power source into a predetermined AC power source and applying it between the flame rod FA and the burner 2 ′, Since no voltage is applied to the frame rod FA, it is possible to provide a gas supply system control device which is safe even if it is touched.

The above-described effect of improving safety also has the effect of increasing the voltage applied to the frame rod FA and shortening the response time. Thermocouples are the most widely used for detecting combustion, but it takes several tens of seconds to detect combustion with a practical thermocouple in a stable manner. It takes a few seconds. The frame rod is said to have a shorter response time than this thermocouple,
It took 4 to 8 seconds to detect combustion stably with an alternating current of 40V. In the present invention, the combustion must be detected instantaneously (1 to 2 seconds), and preferably the combustion must be reliably detected within 1 second. Therefore, the response time can be increased by increasing the applied voltage. Although it was found relatively easily that the voltage can be shortened, if the applied voltage is increased, there is a risk of touching the frame rod and causing an electric shock accident, especially since it is an alternating current. Since the frame rod is not touched after the cock 7 is opened, the problem can be solved by opening the cock 7 so that the voltage is applied to the frame rod for the first time.
It is possible to provide a safer gas supply system control device.

Moreover, in various experiments, if the residual gas pressure is low, there is a case where the gas sufficient for ignition cannot be delivered to the downstream side even if the momentary solenoid valve is opened, and the residual gas amount is always constant. There was no guarantee that it would be kept. In theory,
The residual gas amount is a fixed amount determined by the pipe capacity and gas pressure, but in reality, it is the temperature condition, the time condition after the last use, the flow velocity condition of the gas when it was last used, etc. However, there were cases where sufficient residual gas could not be secured due to complicated factors. Therefore, in the present invention, the main solenoid valve 3 which is normally closed at the upstream portion of the main pipe 1 and is opened under a predetermined condition is provided, and the downstream side of the main pipe 1 is also always closed at a predetermined condition. By providing the sub solenoid valve 4 to be opened, the residual gas between the main solenoid valve 3 and the sub solenoid valve 4 is reliably sealed to secure the residual gas amount, and further, the cock 7 is opened to open the instantaneous valve. By supplying gas into the instantaneous piping via the signal output circuit 21,
Since the residual gas amount is secured more reliably, it is possible to provide a gas supply system control device having good operability.

Further, according to the present invention, since the gas indicator 2 is provided with the alarm indicator lamp 9 and the reset switch 9 ', it is possible to confirm a defective pipe and its state and release the lock at the location of the gas instrument 2 to be used, which has good operability. A gas supply system control device can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a gas supply system control device of the present invention, FIG. 2 is a block wiring diagram of a sub control panel used in the present invention, and FIG. 3 is a main control used in the present invention. It is a block wiring diagram of a board. 1 …… Main piping, 1a …… Sub piping, 2 …… Gas equipment, 3 ……
Main solenoid valve, 4 ... Sub solenoid valve, 5 ... Main pressure monitoring device, 5a
...... Main pressure signal input terminal, 6 …… Sub pressure monitoring device, 6a ……
Sub pressure signal input terminal, 7 ... cock, 8 ... burner, 9
... Alarm indicator, 9 '... reset switch, 9'a ...
… Reset signal input end, 11 …… DC power supply input end, 12 ……
Frame rod power supply switching circuit, 13 …… AC inverter, 14
…… Flame detection circuit, 15 …… Flame signal input end, 15a …… Flame signal connected, 16 …… Cock signal output end, 16a …… Cock signal input end, 21 …… Momentary valve opening signal output circuit, 22 ...... Combustion judgment circuit, 23 ...... Solenoid valve opening and closing circuit, 24 ...... Timer circuit, 25
…… Pipe pressure monitoring circuit, 26 …… First lock circuit, 27 ……
Second lock circuit, MS ... Main pressure switch, SS ... Sub pressure switch, SW1 ... Cock switch, SW2 ... Contact, IG ...
... igniter, FA ... frame rod, C1, C2 ... circuit, A ... midpoint, F ... flame, P '... sub-control panel, P ...
... Main control panel

Claims (1)

[Claims] 1. A main solenoid valve 3 which is normally closed and is opened under a predetermined condition is provided at an upstream portion of a main pipe 1 whose upstream end is connected to a gas supply source. A sub solenoid valve 4 which is closed and opened under a predetermined condition is provided, and a gas appliance 2 having a burner 2 ′ is connected to the downstream side of the sub solenoid valve 4 via a sub pipe 1 a. A main pressure switch that opens and closes in response to changes in gas pressure in the pipe is provided between the solenoid valve 3 and the sub solenoid valve 4.
A sub-pressure switch SS that opens and closes the main pressure monitoring device 5 having an MS at the portion between the sub-electromagnetic valve 4 of the sub-pipe 1a and the cock 7 of the gas appliance 2 in response to the fluctuation of the gas pressure in the pipe. The auxiliary pressure monitoring device 6 having the above is installed, and the gas appliance 2 has a cock switch SW1 which opens and closes in conjunction with opening and closing of the cock 7, an igniter IG for igniting the burner 2 ', and a burner 2'. A flame rod FA for detecting the presence or absence of combustion of the gas, an alarm indicator lamp 9, and a reset switch 9'are provided, and the gas appliance 2 further includes a cock between the DC power input end 11 and the flame rod FA. When the switch 7 is opened, the cock switch SW1 supplies a DC power source to the frame rod FA side, and a frame rod power source switching circuit 12 is provided between the frame rod power source switching circuit 12 and the frame rod FA to supply a predetermined DC power source. AC power Converted to a and a AC inverter 13 to be applied between the flame rod FA and burner 2 ', further, the AC inverter 13 and the flame rod
At the midpoint A of either the circuit C1 or C2 connecting the FA or the burner 2 ', the flame F exists between the flame rod FA and the burner 2'at the DC signal generated by the flame signal output terminal 15. Flame detection circuit 14 that outputs a combustion signal
And a cock signal output end 16 for outputting a cock opening / closing signal when the cock 7 is opened / closed, and a cock signal input connected to the cock signal output end 16 of the sub control board P '. End 16a and flame signal output end 1 of the sub control panel P '
Flame signal input end 15a connected to 5 and reset switch 9b
A reset signal input terminal 9'a connected to the main pressure monitoring apparatus 5, a main pressure signal input terminal 5a connected to the main pressure monitoring apparatus 5, and a sub pressure signal input terminal 6a connected to the sub pressure monitoring apparatus 6. Furthermore, an instantaneous valve opening signal output circuit 21 that is connected to the cock signal input end 16a and outputs a valve opening signal only when the cock opening signal is input, and is connected to the cock signal input end 16a and the flame signal input end 15a. A combustion determination circuit 22 that outputs an energization signal to the igniter IG when a cock open signal is input and a combustion signal is not input, and outputs a valve open signal when both a cock open signal and a combustion signal are input, and this combustion determination circuit 22 and the momentary valve opening signal output circuit 21, and when the valve opening signal is input from either one of them, the main solenoid valve 3 and the sub solenoid valve 4 are connected only while the valve opening signal is being input. Main control that houses solenoid valve open / close circuit 23 that is open A board P is provided, and a cock 7 is provided between the solenoid valve opening / closing circuit 23 and the sub solenoid valve 4.
A contact SW2 that is closed when opened is interposed in series, and further, a timer circuit 24 that outputs a timer signal to the main control panel P that starts when the use of gas is finished and after a predetermined time from the start, The timer circuit 24, the main pressure monitoring device 5, and the auxiliary pressure monitoring device 6 are connected to each other, and when a pressure drop signal is input from the main pressure monitoring device 5 before a predetermined time from the start time of the timer circuit 24, the first lock circuit. 26, the combustion determination circuit 22 is set to a state in which no combustion signal is output, the instantaneous valve opening signal output circuit 21 is set to a state in which a valve opening signal is not output, or the solenoid valve opening / closing circuit 23 is set to the main solenoid valve 3
When the alarm signal lamp 9 is energized by locking the auxiliary solenoid valve 4 in a non-energized state, and a pressure drop signal is input from the main pressure monitoring device 5 after a predetermined time from the start of the timer circuit 24, the second Combustion judgment circuit via lock circuit 27
22 is locked to a state where no combustion signal is output, the instantaneous valve opening signal output circuit 21 is locked to a state where a valve opening signal is not output, or the solenoid valve opening / closing circuit 23 is locked to a state where the main solenoid valve 3 and the sub solenoid valve 4 are not energized. A gas for accommodating a pipe pressure monitoring circuit 25 for energizing the alarm indicator lamp 9 and connecting a reset switch 9'for resetting the lock signal output of the second lock circuit 27 to the second lock circuit 27. Supply system control device.