JPH0765744B2 - Gas safety device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas safety device, and more particularly to a gas safety device suitable for preventing accidents in a general household gas supply system.

[0002]

2. Description of the Related Art Various devices have been proposed for the safety of fuel gas supply, and most of them have been proposed.
The leaked gas or an abnormality in the gas flow rate is detected, and an alarm is issued based on the information obtained thereby, or the gas supply flow path is shut off to prevent an accident.

As a first conventional example, there are a solenoid valve which is interlocked with an instrument plug of a gas combustion instrument in a gas passage and is influenced by a combustion state, and a gas pressure detector which detects a gas pressure in the gas passage. If a lamp goes out for some reason during use, the solenoid valve will automatically close to stop the gas supply, and the gas pressure detector will detect the gas pressure drop due to this and issue an alarm. Japanese Patent Application Publication No. 36494 of 1982 was proposed by the inventor of the present application.

The first conventional example is considered to be excellent in terms of functionality, but since the electric circuit is simple, it is easy to add work. Therefore, if the work is artificially made, it will disappear. Even if the fire is extinguished, the solenoid valve may not close.
After all, it is judged that this safety device lacks the preventive measures against the gas leak caused by such a purpose and is not completed as an electric circuit.

As a second conventional example, there is one in which a solenoid valve is provided on the upstream side of a gas combustion instrument and an automatic ignition mechanism is provided in conjunction with the solenoid valve to use the gas combustion instrument. This gas safety device is constructed so that the ignition mechanism always operates at the same time when the solenoid valve is opened.

However, in the second conventional example described above, it is not mechanically guaranteed that the ignition mechanism operates reliably even if the solenoid valve is opened. Therefore, in the case of this safety device, the ignition device may not ignite even when the gas supply is started by operating the starter device, and there is a risk of an accident due to the extinction of the ignition failure.

In order to make up for the above-mentioned drawbacks, there is a safety device for attaching a strong pilot burner to the gas burning appliance to keep the ignition state at all times, and the gas burning appliance disappears for some reason. However, it is also proposed that the flame of the pilot burner reignites.

However, in the case of the above gas safety device, the amount of gas consumed by the pilot burner is large and the fuel consumption burden is large, and in the case of the cooker, the heat generated by the pilot burner causes the food to deteriorate. There are major drawbacks, such as storage. In addition, if the pilot burner disappears for some reason, it will not work effectively.

Further, there is a pilot burner provided with a combustion detection mechanism in order to make up for the above-mentioned weakness, and when the pilot burner goes out, this detection mechanism causes a gas supply source of the pilot burner with a certain time lag. The solenoid valve attached to the
There are devices where the gas supply is stopped.

However, in the above-mentioned gas safety device, most of the current combustion detection mechanisms use thermocouples, so that the response speed is generally slow, and this tendency is particularly noticeable for those used for a long time. Therefore, the above-mentioned time delay may reach several tens of seconds and sometimes several minutes. That is, there is a risk that a large amount of raw gas will leak during this period. In order to solve this problem, if the time from the thermocouple goes off until the solenoid valve is closed is shortened, the reaction speed at the time of ignition becomes remarkably slow in inverse proportion, and conversely, the reaction speed at the time of ignition is increased. Then, the time for the solenoid valve to close after it goes off,
There is a big drawback that it will be greatly delayed, and if the burner of the pilot and the gas combustion appliance are turned off at the same time, raw gas may leak until the solenoid valve is closed,
It is difficult to demand trust as a gas safety device.

By the way, all the operations of the above-mentioned conventional safety devices are premised on the operation of opening the gas plug of the gas combustion instrument and waiting for the supply and outflow of gas, and then igniting the gas. All the defects of the device are considered to be due to this point.

In order to make up for the above-mentioned drawbacks of the safety device, the idea is changed in the order of opening and closing the instrument plug, the operation of opening and closing the solenoid valve, and the ignition sequence. No. 279024 has been proposed by the inventor of the present application.

In the third conventional example described above, a main solenoid valve installed in a gas supply source and a plurality of branch pipes are installed downstream of the main solenoid valve,
A solenoid valve is installed on the upstream side of the branch pipe, a pressure detection mechanism is provided on each of the downstream sides, and a surge chamber capable of containing a sufficient amount of gas for igniting a gas combustion appliance is provided. Is equipped with a pressure switch that turns on and off in response to changes in the internal pressure. Ignition is performed by the residual gas in the surge chamber, and after it is confirmed that a flame has burned in the gas combustion equipment, the main solenoid valve and support There is provided a system in which a solenoid valve is opened, gas is sent from a gas supply source to a gas combustion appliance, and combustion continues.

In the above system, gas is never supplied from the gas supply source to the gas combustion instrument unless it is confirmed that a flame is present in the gas combustion instrument. And the atmospheric pressure, and the gas contained in the surge chamber only flows out, and since the amount is extremely small, it is completely unrelated to the accident and seems to be a very good safety device. .

However, also in the gas safety device according to the third conventional example, when the gas combustion device is not used for a long time during traveling, the gas sealed between the gas combustion device and the downstream side of the support solenoid valve. In most cases, it can not be used, because it has come off. Especially when a rubber hose is used for the gas flow path of this part, the part of the rubber hose that comes into contact with the gas absorbs the gas.
It has a big drawback that the sealing gas pressure is reduced in 2 days and it cannot be used at all.

[0016]

As described above, the conventional safety devices have merits and demerits, and in reality, none of them are satisfactory in terms of reliability and convenience. Then, the biggest problem is that various disadvantages as described above appear and the convenience is impaired.

Therefore, an object of the present invention is to provide a gas safety device having high reliability but not sacrificing convenience.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the present invention having the subject matter of the above-mentioned patent claims solves the above-mentioned problems by providing the main gas supply passage at an upstream portion near the gas supply source. A main solenoid valve for opening and closing the main gas supply passage, and a branch gas supply passage is branched and connected to the downstream side of the main gas supply passage to open and close the support gas supply passage at the uppermost stream position of each of the support gas supply passages. A main surge chamber containing a predetermined amount of gas is connected to the main gas supply path directly downstream of the main solenoid valve, and further directly downstream of the support solenoid valve of each support gas supply path. Is connected to a supporting surge chamber that stores a predetermined amount of gas, and the gas combustion appliance connected to the downstream end of the supporting gas supply path has a cock switch that opens and closes in conjunction with opening and closing of the appliance plug, A combustion detection switch that opens and closes depending on the presence or absence of combustion, and the instrument plug has opened And an ignition device for detecting the occurrence of combustion by the combustion detection switch and stopping the operation, respectively, when the device is opened by opening the instrument plug. The solenoid valve is energized for a certain period of time and this solenoid valve is opened and closed.When the solenoid valve is closed, a signal is sent to the main solenoid valve for a certain period of time, and the combustion detection switch detects combustion. A solenoid valve power supply circuit that energizes the solenoid valve while it is connected is connected, and when a signal for energizing for a certain period of time is input to any of the main solenoid valves from the above solenoid valve power supply circuits, combustion detection The technical means is provided by connecting a main solenoid valve power supply circuit that energizes the main solenoid valve while the switch detects combustion.

[0019]

Next, the operation of the present invention will be described with reference to the drawings. First, the gas combustion appliances 8a and 8b shown in FIG.
The instrument plugs 6a, 6b are closed, and as a result, all the cock switches 7a, 7b are in the OFF state, and the combustion flames Fa, Fb shown in the figure are not generated, so all the combustion detection switches 10a, 10b are In the OFF state, all the supporting solenoid valves 4a and 4b and the main solenoid valve 3 are closed. The upstream end of the main gas supply passage 1 is connected to a gas supply source (not shown), and the supply gas pressure is applied to the inlet side of the main solenoid valve 3.

Therefore, the single gas burning appliance 8a is not used and the appliance plug 6a is opened. Then, this instrument stopper 6a
The cock switch 7a is turned on (actually turned off
Therefore, it is detected that the instrument plug 6a has been opened. However, since it is possible to use either ON or OFF in terms of electrical equipment, in the present application, it is assumed that the instrument wire 6a is opened by detecting it for convenience. There is. ), Supporting solenoid valve power supply circuit 21a
Then, the supporting solenoid valve 4a is opened and closed for a certain period of time (0.5 seconds as an example), and a sufficient amount of gas for ignition is supplied to the downstream side of the supporting solenoid valve 4a. At the same time, when the cock switch 7a is turned on, the ignition device 9a is activated to generate the combustion flame Fa in the gas combustion appliance 8a by the gas sealed on the downstream side of the support solenoid valve 4a. In addition, after the support solenoid valve 4a is opened and closed for a certain period of time, the main solenoid valve 3 is opened and closed for a certain period of time (0.5 seconds as an example) to facilitate the subsequent combustion upstream of the support solenoid valve 4a. Prepare the gas to do.

When the above operation is reliably performed, that is, when the ignition is normally performed, the combustion detection switch 10a is turned on to detect the combustion flame Fa, and the solenoid valve power supply circuit 2
1a energizes the supporting solenoid valve 4a, and the main solenoid valve power circuit 22 energizes the main solenoid valve 3, and thereafter, while the combustion flame Fa is present, both the supporting solenoid valve 4a and the main solenoid valve 3 are continuously opened to perform combustion. continue.

However, when the ignition fails, that is, when the combustion flame Fa is not generated in the gas combustion appliance 8a even when the appliance plug 6a is opened, the combustion detection switch 10a turns the combustion flame F on.
Since "a" is not detected, the once-closed support solenoid valve 4a and main solenoid valve 3 will not be opened again. In this case, practically, the indicator 23 that the combustion flame Fa is not generated in the gas combustion appliance 8a even if the appliance plug 6a is opened is combined with the signals of the cock switch 7a and the combustion detection switch 10a.
Display and warn with.

When the ignition switch is turned off after being ignited once, the combustion detection switch 10a does not detect the combustion flame Fa at that time, so that the energization of the supporting electromagnetic valve 4a and the main electromagnetic valve 3 is cut off. The valve 4a and the main solenoid valve 3 are closed. Note that, in this case as well, in practice, the display / warning may be performed on the display unit 23, and further, the energization of the supporting solenoid valve 4a and the main solenoid valve 3 may be cut off for a certain time by using a delay circuit or the like. Instead, the ignition device 9a may be operated so as to automatically attempt re-ignition. Note that this re-ignition is limited to several times, and even if re-ignition is attempted a certain number of times, the combustion flame Fa
When the above does not occur, the energization to the supporting solenoid valve 4a and the main solenoid valve 3 is cut off.

When stopping the use of gas, the instrument stopper 6a
Close. Then, the combustion flame Fa disappears, the combustion detection switch 10a is turned off, and the energization to the supporting solenoid valve 4a and the main solenoid valve 3 is cut off, and the supporting solenoid valve 4a and the main solenoid valve 3 are cut off.
And has the action of closing.

[0025]

Embodiments of the present invention will now be described with reference to the accompanying drawings. In the figure, reference numeral 1 denotes a main gas supply passage, the upstream end of the main gas supply passage 1 is connected to a gas supply source (not shown) (the end of an outdoor gas pipe or a propane gas tank), and the downstream side is provided with a plurality of supporting gas supplies. The channels 2a, 2b ... are branched and connected (there are two supporting gas supply channels in the figure, but one or three or more may be used as a matter of course), and the supporting gas supply channels 2a, 2b are connected.
Gas burners 8a, 8b ...
・ The fact that is connected is no different from the conventional general gas supply system.

A main solenoid valve 3 for opening and closing the main gas supply passage 1 is provided at an upstream portion of the main gas supply passage 1 near a gas supply source, and the main gas supply passages 2a, 2b ... Supporting solenoid valve 4 for opening and closing the supporting gas supply paths 2a, 2b ...
a, 4b ... Are interposed respectively.

As the main solenoid valve 3 and the supporting solenoid valves 4a and 4b, conventionally known ones can be used, the specific structure thereof is not shown, but the valve element is normally placed on the valve seat by the biasing force of the spring. When the valve is pressed to block the gas flow path and the solenoid is energized, this valve body is attracted by electromagnetic force and is pulled up against the biasing force of the spring so that the gas flow path communicates, that is, to the solenoid. A gas supply path is used in which the gas supply path is in communication only when electricity is applied.

The main solenoid valve 3 of the main gas supply passage 1
A main surge chamber 5 that stores a predetermined amount of gas is connected to a portion immediately downstream of the above, and each of the supporting gas supply paths 2a and 2b is further connected.
The auxiliary surge chambers 5a, 5b, which store a predetermined amount of gas, are located immediately downstream of the auxiliary solenoid valves 4a, 4b.
.. are connected to each other.

The main surge chamber 5 and the auxiliary surge chambers 5a and 5b may be formed by connecting a simple closed container having a predetermined capacity to the main gas supply passage 1 or the auxiliary gas supply passages 2a and 2b by a branch communication pipe. However, in the present embodiment, the gas extrusion method as shown in FIG. 3 is adopted in order to obtain a gas pressure sufficient for ignition with a small capacity.

That is, in FIG. 3, reference numeral 50 designates a chamber body, which is composed of an upper casing portion 51a and a lower casing portion 51b which are vertically divided into two parts. Then, the upper casing portion 51a and the lower casing portion 5
The diaphragm 52 is sandwiched between the diaphragm 1 and 1b, the lower part of the diaphragm 52 is the gas storage chamber A, and the upper part is the spring storage chamber B.
It is divided into A communication pipe 53 is provided at the lower end of the lower casing portion 51b so that the gas storage chamber A is filled with gas by connecting the communication pipe 53 to the main gas supply passage 1 or the supporting gas supply passages 2a and 2b. It has been done.

In the spring accommodating chamber B, a spring 54 that keeps balance with the gas pressure in the gas accommodating chamber A is formed.
Is stored, and the diaphragm 52 holds the gas pressure and the spring 5.
The biasing force of the spring 54 is added to the gas pressure to push out the gas when the gas in the gas storage chamber A flows out. Yes.

The reason why the diaphragm 52 and the spring 54 are used is that when the surge chamber is a simple container having a predetermined capacity, the gas can be sent out only by the amount corresponding to the difference between the internal pressure of the surge chamber and the atmospheric pressure. Since it is not possible to prepare a sufficient amount of gas and gas pressure for ignition unless the capacity is considerably increased, if the gas is pushed out by the urging force of the spring 54, the gas required for ignition can be fed at one time. This is because the main body 50 can be downsized.

Although not used in the example of FIG. 1,
A pressure switch 55 for detecting a decrease in gas pressure in the gas storage chamber A is stored in the spring storage chamber B. The pressure switch 55 is opened and closed by the displacement of the diaphragm 52. In the illustrated example, a reed switch is used, and the diaphragm 52 is provided with a switch operating rod 57 having a permanent magnet 56 that comes in contact with and separates from the pressure switch 55 composed of the reed switch. Gas storage room A
A predetermined gas pressure is applied inside, the diaphragm 52 to the permanent magnet 56 are in the raised position and are close to the pressure switch 55, and the pressure switch 55 is in the ON state by the magnetic field of the permanent magnet 56. When the gas pressure in A decreases, the diaphragm 52 to the permanent magnet 56 descend, and the pressure switch 55 is not affected by the magnetic field of the permanent magnet 56 and is turned off.

Further, the instrument plugs 6 are attached to the gas combustion instruments 8a, 8b, ... Connected to the downstream ends of the supporting gas supply passages.
Cock switches 7a, 7b ... Which are opened / closed in conjunction with opening / closing of a, 6b ..., Combustion detection switches 10a, 10b.
cock switches 7a, 7b indicating that a, 6b ...
The ignition devices 9a, 9b, ..., Which detect the fact that combustion has occurred due to the detection by b.

The cock switches 7a, 7b ...
Various publicly known ones can be used as long as the switches can be opened / closed in conjunction with opening / closing of the instrument plugs 6a, 6b ..., However, in the present embodiment, a complicated mechanical structure is omitted as much as possible. Although not shown, the instrument stoppers 6a, 6b
..With a permanent magnet in the moving part and a reed switch fixed to a fixed portion close to the permanent magnet. The instrument plugs 6a, 6b ... The permanent magnet is separated from the reed switch when the instrument plugs 6a, 6b ... Are moved to open, and the reed switch is opened and closed.

Further, the combustion detection switches 10a, 10
b ... can be used to detect the combustion flame as changes in temperature (for example, using a thermocouple / bimetal switch), light (for example, using a phototransistor), etc., and open / close the switch. In the examples, the frame rod system having the fastest response speed was used. This frame rod system is also well known in the art, and burners 8a, 8b ...
And frame rod 24 inserted in the area where combustion flame is generated
When an AC voltage is applied to the combustion flame and the flame is connected between the combustion instrument and the frame rod 24, a current flows due to the rectification of the combustion flame, and this current activates the FET transistor. .

The ignition devices 9a, 9b ...
It is possible to use a conventionally known one that generates a high voltage in the igniter coil by energization to generate a spark discharge. In addition,
Igniter power supply circuit 25 of ignition devices 9a, 9b ...
... is ON (the appliance plug is open) and the ignition devices 9a, 9b ... are energized, and the combustion detection switches 10a, 10b ... are ON (when combustion is detected). It is designed to shut off.

Then, each of the supporting solenoid valves 4a, 4b ...
When the instrument plugs 8a, 8b ... Are opened, the supporting solenoid valves 4a,
The solenoid valves 4a and 4b are energized for a certain period of time.
... is opened and closed, and then the supporting solenoid valves 4a, 4b ...
・ When is closed, a signal for energizing the main solenoid valve 3 for a certain period of time is issued, and the combustion detection switches 10a, 10b ...
Are connected to the supporting solenoid valve power supply circuits 21a, 21b, ... For energizing the supporting solenoid valves 4a, 4b.

The supporting solenoid valve power supply circuits 21a, 21b ...
Can be variously realized by a logic circuit having a built-in timer circuit, etc., but in this embodiment, the solenoid valve power supply circuit 21a receives signals from the cock switch 7a and the combustion detection switch 10a, and first, from the cock switch 7a. Instrument stopper 8a
When a signal that the switch has been opened is input, two timer circuits are activated, and one of the timer circuits turns on the energization circuit for the solenoid valve 4a only for the timer setting time. In addition, the other timer circuit is set longer than the one timer circuit, the output of the other timer circuit is combined with the output of the one timer circuit in the exclusive OR circuit,
After the output of one timer circuit is cut off, the energizing circuit to the main solenoid valve 3 is turned on only for the remaining set time of the other timer circuit.
An energization signal is output to the main solenoid valve power supply circuit 22 to be described later so as to be N.

When a combustion detection signal is received from the combustion detection switch 10a, the energizing circuit for the solenoid valve 4a is turned on without passing through the two timer circuits.

The main solenoid valve 3 receives a signal for energizing for a certain period of time from any of the supporting solenoid valve power supply circuits 21a, 21b, ..., and one of the combustion detection switches 10a, 10b. The main solenoid valve power supply circuit 22 is connected to energize the main solenoid valve 3 while detecting combustion.

The main solenoid valve power source circuit 22 can also be variously realized by a logic circuit or the like, but in this embodiment, it is constituted by a logical sum circuit having two signal input terminals, and one combustion terminal is provided at one input terminal. The output terminals of the detection switches 10a, 10b ... Are connected in parallel, and the other input terminal is connected to each solenoid valve power supply circuit 21.
The energization signal output terminals of a, 21b, ... Are connected in parallel, and the energization circuit of the main solenoid valve 3 is turned on when a signal is input to either one of the input terminals. The main solenoid valve power supply circuit 22 is connected to each supporting solenoid valve power supply circuit 21.
Needless to say, they may be integrally incorporated in a, 21b, ....

In the example shown in FIG. 1, the output terminals of the cock switches 7a, 7b, ...
0a, 10b ... and the cock switch 7a,
7b signal and combustion detection switches 10a, 10b
.. In combination with the signal of and, it is determined that the case where the combustion flame does not occur even though the instrument plug 6a is opened is judged to be abnormal, and the abnormal signal is sent to the display 23 to issue an abnormal display or alarm. Yes.

Next, the embodiment shown in FIG. 2 will be described.
In this "FIG. 2" embodiment, a pipe pressure monitoring mechanism and an automatic operation mechanism are added to the above "FIG. 1".

First, the in-pipe pressure monitoring mechanism detects a decrease in the in-pipe pressure by opening and closing the pressure switch 55 (detects that the in-pipe pressure has decreased by turning OFF in the illustrated example), and outputs this pressure drop signal. In the main solenoid valve power supply circuit 22 and each of the support solenoid valve power supply circuits 21a, 21b ... In combination with the timer signal started from the time when the main solenoid valve 3 and the support solenoid valves 4a, 4b ... When a pressure drop signal is input within a predetermined time after closing, the piping 23 is determined to be defective, and an error is displayed on the display 23.

It should be noted that if the pressure drop signal is after a predetermined time from the closing of the solenoid valve, this may be ignored altogether, but in the present embodiment, in this case, defective piping does not lead to an accident. The main solenoid valve 3 and the support solenoid valves 4a, 4a
b ... is instantly opened and closed to replenish the leaked gas.

The automatic operation mechanism includes an automatic operation electromagnetic valve 41 provided downstream of the auxiliary electromagnetic valve 4b in the auxiliary gas supply passage 2b, a timer which is turned on / off at a set time and an automatic operation electromagnetic valve. And an automatic operation circuit 40 including a power supply circuit 41. The output end of the cock switch 7b is connected to the solenoid valve power supply circuit 21b via the automatic operation circuit 40.

In the automatic operation circuit 40, the output signal of the cock switch 7b is normally short-circuited to the ground, and the output of the cock switch 7b is not input to the solenoid valve power supply circuit 21b even if the instrument plug 6b is opened. Only when both the cock switch 7b and the timer of the automatic operation circuit 40 are turned on, an energization signal is output to the supporting solenoid valve power supply circuit 21b so that the energizing circuit of the supporting solenoid valve power supply circuit 21b is turned on. is there. In addition, the cock switch 7b and the automatic driving circuit 40
When both of the timers are turned on, the power supply circuit of the automatic operation solenoid valve 41 is also turned on, and the automatic operation solenoid valve 41 is also opened.

That is, when the above-mentioned automatic operation mechanism is used, the cock switch 7b is left open and the timer of the automatic operation circuit 40 sets the ON state for a predetermined time. Then, when this timer is turned on, the automatic operation solenoid valve 41
Is opened and an ignition operation is performed to automatically ignite, and when the timer is turned off after a set time elapses, the automatic operation solenoid valve 41 is closed to automatically extinguish the fire.

The automatic operation circuit 40 is provided with a selection switch for selecting whether or not to use the automatic operation circuit 40. If the selection switch is not used, the output of the cock switch 7b is output. The end is this automatic driving circuit 4
It may be possible to directly connect to the solenoid valve power supply circuit 21b without passing through 0. In this case, if the selection switch is set to not use, the power supply circuit of the automatic operation solenoid valve 41 is turned on. Good.

[0051]

As described above, according to the present invention, when the instrument plug is opened, the cock switch is turned on, the supporting solenoid valve is instantly opened, and the supporting surge chamber is replenished with gas necessary for ignition. Even if the gas on the downstream side of the support solenoid valve is not in use, ignition can be reliably performed.In addition, the main solenoid valve is opened momentarily to replenish the gas sent to the downstream side of the support solenoid valve. It is possible to provide a gas safety device with good operability that can stably continue the subsequent combustion.

Further, according to the present invention, the support solenoid valve and the main solenoid valve are opened at the same time after it has been confirmed that combustion has occurred, and before that, one of the support solenoid valve and the main solenoid valve must be closed. The gas supply is never released. Therefore, even if a gas leak occurs in the unburned state, the amount is a small amount that remains on the downstream side of the supporting solenoid valve or the main solenoid valve that does not lead to an accident. What can be provided.

[Brief description of drawings]

FIG. 1 is a front view with a block wiring diagram showing an embodiment of a gas safety device of the present invention.

FIG. 2 is a front view with a block wiring diagram showing another embodiment of the present invention.

FIG. 3 is a vertical sectional view of a main / support surge chamber used in the present invention.

[Explanation of symbols]

 1 Main Gas Supply Path 2a Support Gas Supply Path 2b Support Gas Supply Path 3 Main Solenoid Valve 4a Support Solenoid Valve 4b Support Solenoid Valve 5 Main Surge Chamber 5a Support Surge Chamber 5b Support Surge Chamber 6a Instrument Plug 6b Instrument Plug 7a Cock Switch 7b Cock Switch 8a Gas combustion appliance 8b Gas combustion appliance 9a Ignition device 9b Ignition device 10a Combustion detection switch 10b Combustion detection switch 21a Support solenoid valve power supply circuit 21b Support solenoid valve power supply circuit 22 Main solenoid valve power supply circuit

Claims (1)

[Claims] 1. A main solenoid valve for opening and closing the main gas supply passage is provided at an upstream portion of the main gas supply passage near the gas supply source, and a support gas supply passage is branched downstream of the main gas supply passage. A supporting solenoid valve that is connected and that opens and closes the supporting gas supply path is provided at the most upstream position of each supporting gas supply path, and a predetermined amount of gas is provided at a position immediately downstream of the main electromagnetic valve of the main gas supply path. Connect the main surge chamber to be stored, and further
A supporting surge chamber that stores a predetermined amount of gas is connected directly downstream of the supporting solenoid valve of each supporting gas supply path, and the gas combustion appliance connected to the downstream end of the supporting gas supply path has an appliance. A cock switch that opens and closes in conjunction with the opening and closing of the plug, a combustion detection switch that opens and closes depending on the presence or absence of combustion, and a cock switch that operates by detecting the opening of the instrument plug and operates to detect that combustion has occurred. And an ignition device for stopping the operation are respectively provided, and when each of the support solenoid valves is opened with an instrument plug, the support solenoid valve is energized for a certain time to open and close the support solenoid valve, and then the support solenoid valve is closed. When the solenoid valve is closed, a signal is sent to the main solenoid valve to energize it for a certain period of time, and a solenoid valve power supply circuit is connected to energize the solenoid valve while the combustion detection switch detects combustion. , One of the power supplies to the main solenoid valve If the signal of the predetermined time energizing the valve power supply circuit is input and combustion detection switch detects and combine with becomes gas safety device main solenoid valve power supply circuit for energizing between the main solenoid valve and combustion.