JPH073103Y2 - Gas shutoff valve controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a gas cutoff valve control device for opening and closing a gas cutoff valve built in an electronic gas meter.

[Conventional technology]

Generally, a gas meter is installed in an outdoor gas pipeline to measure the amount of gas used. Especially, in an electronic gas meter, one meter reading pulse is generated every time a predetermined flow rate of gas flows in the gas pipeline. Is configured. Some gas meters of this type are designed to internally count meter reading pulses. This has a microcomputer (CPU) inside to perform the above counting, etc., and the count value of the meter reading pulse is sent to the remote controller via the communication line in response to a request from the remote controller installed indoors. I am supposed to send it. This electronic gas meter uses a battery as a power source so that the meter reading function is not stopped by counting the meter reading pulses even during a power failure.

Therefore, the remote controller has a so-called meter reading function that creates gas usage data based on the count value from the electronic gas meter and periodically transmits the data to the gas company. This remote controller uses a commercial power source as a power source.

Recently, a gas shut-off valve that closes a gas pipeline in the event of an abnormality has been used in an electronic gas meter. When closing the gas shutoff valve, the gas alarm connected to the remote controller to detect and detect a gas leak detects a gas leak, the valve closing switch provided on the remote controller is operated, and the gas meter is abnormal. Sometimes there is a gas flow. Front 2
In both cases, the gas shutoff valve is closed by the valve closing signal from the remote controller. In the last case, the gas cutoff valve is closed by the remote controller outputting a valve closing signal in response to the cutoff request signal sent from the gas meter to the remote controller. Such control is intended to suppress the consumption of the power supply battery of the electronic gas meter as much as possible by driving the gas cutoff valve from a remote controller that uses a commercial power supply as a power supply.

FIG. 4 is a block diagram showing an example of the above-described conventional gas shutoff valve control device. In FIG. 4, the remote controller 3 installed indoors has a valve closing switch SW ₁ and a valve opening switch SW _{1 on} the front panel of its case. A switch SW ₂ is provided, and a CPU 5 is housed in the case. Signals are input to the CPU 5 from the gas alarm signal receiving circuit 7, the open / close switch circuit 8 and the shutoff request signal receiving circuit 9, and the CPU 5 outputs a control signal to the shutoff valve open / close signal transmitting circuit 6.

A detection signal generated when the gas alarm 4 detects a gas leak is input to the gas alarm signal receiving circuit 7. Also,
The CPU 5 is connected to a display circuit 10 for displaying each state and a power supply circuit 11 for rectifying AC 100V into a DC power supply and supplying the same to each unit such as the CPU.

On the other hand, the electronic gas meter 1 has a function of generating a meter reading pulse, and has a gas cutoff valve 2, a CPU 13, and a cutoff valve drive circuit 14.
The shutoff valve drive circuit 14 outputs a shutoff request signal,
This is input to the CPU 5 via the cutoff request signal receiving circuit 9 of the remote controller 3. Further, the gas shutoff valve 2 is controlled to be opened / closed by a valve open signal and a valve close signal from the shutoff valve open / close signal transmission circuit 6.

Further, the CPU 5 and the CPU 13 exchange data via the communication line 1 and the communication circuit 12 in the remote controller 3,
U13 detects an abnormality (logical abnormality) of the electronic gas meter 1 and causes the shutoff valve drive circuit 14 to output a shutoff request signal in response to the abnormality detection. Moreover, the CPU 13 shuts off when data is sent from the CPU 5 via the communication circuit 12 and the communication line 1 in response to the gas leak detection signal from the gas alarm device 4 or the operation of the valve closing step SW _1. The valve drive circuit 14 outputs a shutoff request signal.

With the above configuration, the operation of the apparatus will be described with reference to the flowchart of FIG. 5 showing the work performed by the CPUs 5 and 13.

First, in step S1, it is determined whether or not there is a gas leakage abnormality based on the signal from the gas alarm device 4, and the determination is YE.
If there is an abnormality in S, the process proceeds to step S2, and the determination is N
If O, go to step S3. In the step S2, it is determined whether or not the abnormality continues for a predetermined time (for example, 45 seconds). If the determination is YES, that is, the abnormality continues for the predetermined time, the process proceeds to step S4. If the determination is NO, the step S1 is performed. Return to.

In step S3, it is determined whether the valve close switch SW ₁ has been operated, and the determination is YES, that is, the valve close switch S1.
If W ₁ is operated, the process proceeds to step S4, and if the determination is NO, that is, if the valve closing switch SW ₁ is not operated, the process proceeds to step S5. In step S4, the gas meter 1
To the gas cutoff valve 2 through the communication circuit 12 and the communication line l
Outputs a valve closing signal that instructs the shutoff of the.

On the other hand, the CPU 13 of the electronic gas meter 1 logically determines whether or not there is an abnormality inside the CPU in the first step S10 of the operation. The determination in step S10 is NO
That is, if there is no abnormality, the process proceeds to step 11 and the determination is YES.
That is, if there is an abnormality, the process proceeds to step S12.

In step 11, the CPU 5 executes step S4 to determine whether or not there is a shutoff instruction signal from the remote controller 3. If the determination in step S11 is YES, that is, if there is a shutoff instruction signal, the process proceeds to step S12. If the determination is NO, the process returns to step S10. In step S12, the cutoff request signal is passed through the cutoff request signal receiving circuit 9.
Output to CPU5.

CPU5 of remote controller 3, when it is determined that valve-closed switch SW ₁ is not operated in the step S3, or the process proceeds to step S5 after outputting the interrupting instruction signal in step S4, in step S5, the
Based on the signal from the cutoff request signal receiving circuit 9, the circuit 9
Determines whether the cutoff request signal from the gas meter 1 is received. If the determination in step S5 is YES, that is, if it has been received, the process proceeds to step S6, where the shutoff valve opening / closing signal transmission circuit 6 outputs a valve closing signal to directly close the gas shutoff valve 2. After executing step S6, that is, after closing the valve, or if the determination in step S5 is NO, that is, if the shutoff request signal is not received, the process proceeds to step S7.

In step S7, determines whether or not the valve opening switch SW ₂ is operated, judgment proceeds to step S8 if it is YES, that operation, where whether or not there is an abnormality detection signal from the gas detector 4 Is determined. If the determination in step S8 is YES, that is, normal (if no abnormality detection signal is output), the process proceeds to step S9, in which the shutoff valve open / close signal transmission circuit 6 outputs a valve open signal and the gas shutoff valve 2
Directly open the valve. When the determination is NO, that is the valve opening step SW ₂ in step S7 is not operated, the step S
When there is the judgment NO of 8, that is, the abnormality detection signal, and after the execution of step S9, the process returns to step S1.

In the above-mentioned example, even when the CPU 13 of the gas meter 1 detects the abnormality of the gas meter main body, the shutoff request signal is output to control the closing of the gas shutoff valve 2 by the remote controller 3.
I try to do it on my side.

It should be noted that the valve closing switch SW ₁ and the valve opening switch SW ₂ are operated when the gas shutoff valve 2 is closed by the intention of the gas user when the gas is not used for a long time or when going to bed at night, and then opened. It is something.

[Problems to be solved by the device]

In the configuration described above, the remote controller 3 is affected by a power failure.
When AC100V is not supplied to the power supply circuit 11 of, the driving power is not supplied to the CPU5 and the like, and even if the shutoff request signal is input from the electronic gas meter 1, the shutoff valve open / close signal transmission circuit 6 outputs the valve close signal. Therefore, the gas shutoff valve 2 in the gas meter 1 cannot be closed.

As a method of eliminating such a situation, it is conceivable to add a battery to the power supply of the remote controller 3 to back it up, but this method is disadvantageous in terms of cost.

Therefore, the present invention provides a gas shutoff valve that can close the gas shutoff valve in response to a shutoff request signal from an electronic gas meter without a battery for backing up the power supply during a power outage. An object is to provide a valve control device.

[Means for Solving the Problems]

As shown in the basic configuration diagram of FIG. 1, a gas shutoff valve control device according to the present invention for solving the above-mentioned problems is provided in a gas pipeline, and meter reading is performed every time a predetermined gas flows in the gas pipeline. A gas cutoff valve 2 that generates a pulse and opens and closes a gas pipeline by opening and closing the valve according to a control signal input from the outside is included, and an abnormality is detected based on the meter reading pulse to request a shutoff request signal. And an electronic gas meter 1 that outputs a control signal to output a control signal for closing the gas shutoff valve 2 based on the shutoff request signal. The remote controller 3 includes a control signal output means 5a for outputting the control signal in response to an input of a cutoff request signal, a power failure detecting means 15 for detecting a power failure, and a power failure detecting means 15 for detecting a power failure. And a cutoff request signal control circuit 16 for controlling the input of the cutoff request signal to the control signal output means 5a according to the output, when the power failure detection means 15 detects a power failure, the cutoff request signal control circuit 16 Is not input to the control signal output means 5a but is sent as a signal for closing the gas cutoff valve 2 of the electronic gas meter 1.

[Action]

In the above configuration, when the cutoff request signal is output from the electronic gas meter 1 during normal operation without power failure,
In response to the shutoff request signal, the valve closing signal output means 5a outputs a valve closing signal to the gas shutoff valve 2 to close the valve. On the other hand, when the power failure detection means 15 detects a power failure, the shutoff request signal control circuit 16 sends a shutoff request signal directly to the gas shutoff valve 2 without passing through the control signal output means 5a in response to the detection of the power failure. Is output to close the valve.

As described above, the gas shutoff valve 2 can be closed even when an abnormality occurs in the electronic gas meter that uses the battery as a power source and outputs the shutoff request signal during a power failure. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the gas cutoff valve control device according to the present invention, and the same parts as those of the conventional device described with reference to FIG. 4 are designated by the same reference numerals.

In FIG. 2, the shutoff request signal output from the shutoff valve driving circuit 14 is input to the shutoff request signal control circuit 16 and is input to the shutoff request signal receiving circuit 9 via the control circuit 16 and the shutoff request signal is received. The output of the control circuit 16 is directly input to the gas cutoff valve 2. A power failure detection circuit 15 that detects a power failure is connected to the power supply circuit 11, and the cutoff request signal control circuit 16 is controlled by the output of the power failure detection circuit 15.

In the above-mentioned configuration, in the normal state in which 100V AC is supplied to the power supply circuit 11, the power is supplied to the cutoff request signal receiving circuit 9 through the cutoff request signal control circuit 16, and the CPU 5 performs the same operation as the flowchart of FIG. .

On the other hand, when the power supply circuit 11 is not energized with 100 V AC in the power failure state, the power failure detection circuit 15 detects this and inputs the detection signal to the cutoff request signal control circuit 16. When the detection signal is input, the shutoff request signal control circuit 16 outputs the shutoff request signal to the gas shutoff valve 2 as a valve closing signal. At this time, the cutoff request signal is not input to the cutoff request signal receiving circuit 9. Therefore, even if CPU5 is inoperative due to a power failure,
When the shutoff request signal is output from the electronic gas meter 1, the gas shutoff valve 2 can be closed.

FIG. 3 shows a specific example of the present invention. The power failure detection circuit 15 is composed of a relay RL (excitation winding) connected to the secondary side rectified output from the power supply circuit 11, and the cutoff request signal control circuit 16 is the relay.
It is composed of switches SW ₃ and SW ₄ driven by RL. Further, the cutoff request signal receiving circuit 9 is an inverter circuit including a transistor Q ₁ , and the cutoff request signal is a switch.
Input to the base of transistor Q ₁ via SW ₃ . The shut-off valve opening / closing signal transmission circuit 6 includes diodes D ₁ and D ₂ that rectify the AC voltage from the power supply circuit 11, a 3 V stabilized power supply 17, phototransistors Q _P1 and Q _{P2 of} the photocouplers PC ₁ and PC ₂ , and diodes D _3, D _4, capacitors C ₁ -C _3, a Zener diode ZD _1, consists further photocoupler PC ₁ connected between the output of the CPU5 a power supply circuit 11, PC ₂ photodiodes D _P1, D _P2 The shutoff request signal is connected to the common connection point of the diodes D ₃ and D ₄ via the switch SW _4, and a valve closing signal for the gas shutoff valve 2 is output from the common connection point and the capacitor C ₂ , A valve open signal is output from the common connection point (earth line) of C ₃ .

In the above configuration, when the power supply circuit 11 is energized with 100 V AC, the relay RL is excited and the switch SW
₃ on, SW ₄ off. Therefore, the shutoff valve drive circuit
The cutoff request signal, which is a positive rectangular wave voltage (eg, 3V) from 14, is input to the base of the transistor Q ₁ via the switch SW ₃ , and its collector output is input to the CPU 5. When the CPU 5 receives the cutoff request signal, the photodiode D _P1 side is set to L level to emit light, and the phototransistor Q _P1 is turned on. As a result, a positive rectangular wave voltage (for example, 3 V) is output to the common connection point of the diodes D ₃ and D ₄ , and the rectangular wave voltage is supplied to the gas cutoff valve 2 as a valve closing signal. When the valve open switch SW ₂ is operated, the CPU 5
Photo light is emitted by the _P2 side to the L level, the transistor Q _P1
Turn on. As a result, a negative rectangular wave voltage (for example, -24V) is output to the common connection point of the capacitors C ₂ and C ₃ ,
The rectangular wave voltage is output to the gas cutoff valve 2 as a valve opening signal.

On the other hand, when the AC100V to the power supply circuit 11 by a power failure or the like is not supplied, the relay RL is no longer excited, the switch SW ₃ is OFF, SW ₄ is switched on. Since the CPU 5 is inoperative, the anode voltages of the photodiodes D _P1 and D _P2 are both at the L level and are off. Therefore, both phototransistors Q _P1 and Q _P2 are turned off. As a result, the shutoff request signal is not input to the transistor Q ₁ and is directly output to the gas shutoff valve 2 as a valve closing signal via the switch SW ₄ . Therefore, even if the CPU 5 is not operating, the gas shutoff valve 2 can be closed if the shutoff request signal is generated due to an abnormality of the gas meter 1.

〔effect〕

As described above, according to the present invention, the gas shutoff valve can be closed according to the shutoff request signal from the electronic gas meter even when the remote controller is inoperative due to a power failure or the like. Therefore, it is not necessary to provide a large-capacity power backup to the remote controller.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a gas shutoff valve control device according to the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a circuit showing a concrete example of a main part in FIG. FIG. 4 is a block diagram showing the already proposed system, and FIG. 5 is a flow chart showing the processing of the CPU of FIGS. 2 and 4. DESCRIPTION OF SYMBOLS 1 ... Electronic gas meter, 2 ... Gas cutoff valve, 3 ... Remote controller, 5a ... Control signal output means (CPU), 15 ...
Power failure detection means, 16 ... Shutdown request signal control circuit.

Claims (1)

[Scope of utility model registration request] 1. A gas pipe line is provided, a metering pulse is generated each time a predetermined gas flows through the gas pipe line, and the valve is opened and closed by a control signal input from the outside to open the gas pipe line. An electronic gas meter that has a built-in gas shutoff valve for shutting off and that outputs a shutoff request signal by detecting an abnormality based on the meter reading pulse, and the shutoff request signal provided at a location distant from the electronic gas meter In a gas cutoff valve control device including a remote controller that outputs a control signal for closing the gas cutoff valve based on the above, the remote controller outputs a control signal that outputs the control signal in response to an input of a cutoff request signal. Output means, power failure detection means for detecting a power failure, and a shutdown request for controlling the input of the shutdown request signal to the control signal output means according to the output of the power failure detection means A signal control circuit, and when the power failure detection means detects a power failure, the cutoff request signal control circuit does not input the cutoff request signal to the control signal output means, and the gas cutoff valve of the electronic gas meter Is sent as a signal for closing the valve.