JPS6021297B2 - Gas automatic shutoff device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting gas leakage and automatically and reliably stopping gas supply.

In recent years, the airtightness of houses such as condominiums has improved, and gas accidents have become more frequent.

In this case, various devices have been developed that detect gas leaks and simply issue an alarm, but they cannot be used at all if no one is nearby. Therefore, an object of the present invention is to provide an automatic gas circuit breaker that completely prevents accidents caused by gas leaks by detecting gas leaks and reliably stopping gas supply.

Hereinafter, the gas automatic circuit breaker device according to the present invention will be explained in detail using the drawings. The figure is a circuit diagram showing an embodiment of an automatic gas shutoff device according to the present invention, and in the figure, la
, lb are power terminals to which commercial power is supplied, 2 is a power switch, 3 is a power transformer, and the primary winding 3a is connected to the power terminals la, lb via the power switch 2.

4 and 5 are a no-voltage relay and a timer relay connected between the output side of the power switch 2 and the fin source terminal lb, respectively;
6 and 7 are full-wave rectifier circuits provided on the output sides of the secondary windings 3b and 3c of the power transformer 3, respectively; 8 and 9 are capacitors provided to smooth the outputs of the rectifier circuits 6 and 7; 10 is a transistor whose collector is connected to the output terminal of the rectifier circuit 6, and whose base is controlled by the output of the voltage stabilization control circuit 11 to send out a constant voltage output; 12 and 13 are voltage stabilization control devices that press the output of the transistor 10; These resistors feed back to the circuit 11, and constitute a generally known constant current circuit 14.

15 is a diode for backflow prevention, 16 is a constant voltage circuit 14
17 is a battery that charges the output of the rectifier circuit 7 via the normally open contact 5a of the timer relay 5;
4a converts the output of the battery 17 to DC during a commercial power outage.
- The normal cross contact of the non-voltage relay 4 that supplies the AC converter 16, 19 detects leaked gas using the output of the constant voltage circuit 14 or the output of the battery 17 as a power source,
A gas sensor 18 is activated by the gas detection output of the gas sensor 19, and 20 is a timer that is initial reset when the constant voltage circuit 14 or battery 17 generates an output and generates an output after a certain period of time. circuit, this timer circuit 20
is set to a time that covers the unstable operation time when power is supplied to the gas sensor 19.

21 is an AND gate for determining the coincidence of the output of the timer circuit 20 and the output of the normally open contact 18a of the relay 18;
22 is an inverter 2 that inverts the output of the AND gate 21;
3 is a relay driven by the output of the inverter 22, 24 is a capacitor that is normally charged via the contact 233 of the relay 23 and the resistor 25, and 26 is the output of the capacitor 24 that is supplied by switching the contact 23a when the relay 23 is activated. This latching relay 26 is mechanically locked when activated, and is unlocked by manual operation.

26a, the common is the output terminal P of the DC-AC converter 16
The normal cross contact a of this contact 26a is connected to one end of the primary winding 27a of the transformer 27, and the normal oven contact b is connected to the primary winding 28a of the transformer 28. It is connected.

29 is a gas circuit breaker installed in the gas supply pipe,
This gas circuit breaker is driven by a gear mode 30 connected to the rotating shaft of the gas switch (not shown) and a cam provided on the rotating shaft of the gas switch, so that the gas switch opens and closes every 9 rotations. Micro switch 3 that operates in response to
It is composed of 1.

The gas switch is a gas valve attached to a gas supply pipe in a well-known manner, for example, by rotating a pipe body with an iron insert and sealing the outer periphery of the gas supply pipe, and opening a hole in the pipe line and the pipe body. The valve is constructed so that when the holes are aligned, the valve is closed, and when the holes are blocked by the pipe body, the valve is closed.
The tubular body is rotated by a geared motor 30 to switch the opening/closing operation of the gas switch.

And said microphone.

The movable piece a of the switch 31 is connected to the contact point b of the gas switch.
It is also connected to contact c when the temperature is low. Further, the movable piece a is connected to an output end Q of the DC-AC converter 16 via a geared motor 30. Furthermore, contact b of the microswitch 31 is connected to the primary coil 28 of the transformer 28.
a, and contact c is connected to the primary coil 27 of the transformer 27.
connected to a. Reference numeral 32 denotes an operation panel provided near the gas circuit breaker 29, and this operation panel 32 is provided with an indicator lamp 33 and a shirt switch 34 consisting of a non-lock type normally open contact.

The indicator lamp 33 is connected between both ends of the geared motor 30 to indicate when the geared motor 30 is operating. Further, the shirt switch 34 is connected between the primary winding 27a of the transformer 27 and the contact b of the microswitch 31. 35 is the secondary winding 27 of the transformer 27
36 is a smoothing capacitor, 37 is a transistor whose base input is the output of rectifier circuit 35, 38 is a relay operated by the output of transistor 37, and 39 is a secondary winding of transformer 28. A rectifier circuit for rectifying the output of the line 28b, 40 a smoothing capacitor, 41 a transistor whose base input is the output of the rectifier circuit 39, 4
2 is a relay operated by the output of the transistor 41; 43 is an open operation indicator light connected between the DC power supply and ground via the open contact 38a of the relay 38; 44
, 45 is a resistor and a capacitor that integrate the output of the contact 38a, 46 is an inverter that inverts the integrated output that is shared and combined via the resistor 44a, and 47 is connected between the DC power supply and ground via the normally open contact 42a of the relay 42. Connected shut operation indicator lights 48 and 49 are resistors and capacitors that integrate the output of the contact 42a, and an inverter that inverts the integrated output output via the resistor 48a.
2 is a flip-flop which has the output of the inverter 46 as the reset input R, the DC power output as the D input, and the integral output outputted via the resistor 48a as the T input; 53 has the output of the inverter 50 as the reset input R, and the DC Power output D
54 is an inverter that inverts the set output F of the flip-flop; 55 is an inverter that inverts the set output F of the flip-flop 53; 56 is an inverter that inverts the set output F of the flip-flop 53; A shut indicator light 58 is connected between the output of the inverter 54 and the positive electrode of the DC power supply via a resistor 59, a shut indicator light 58 is connected to a circuit in charge of other monitoring areas via a resistor 59, and a resistor 60 indicates a shut indicator light connected via a resistor 61. an open indicator light 62 connected between the inverter 55 and the positive pole of the DC power supply;
64 is a gas leak indicator light connected between the inverter 22 and the positive pole of the DC power supply via a resistor 65; 66 is a gas leak indicator light connected to a circuit in charge of other monitoring areas; A gas leak indicator light is connected between the circuit in charge of other monitoring areas and the positive pole of the DC power supply, 68 is a resistor, a power indicator light is connected between both ends of the DC power supply via 69, and 70 is a buzzer stop. A buzzer 73 is connected between the output end of the inverter 22 and the positive electrode of the DC power source via a switch 71 and a diode 72, and a diode 73 connects one end of the buzzer 70 to the inverter 22.

These are installed on a central monitoring panel 74 installed in a management room or the like. 75 is a buzzer connected between the output of the inverter 22 and the positive electrode of the DC power supply,
This buzzer 75 is provided in the monitoring area.

The operation of the above configuration will be explained below. In the circuit configured as described above, when the power switch 2 is closed, the commercial power is supplied to the power transformer 3 through the power terminals la and lb.
The voltage is supplied to the secondary winding 3a, and a reduced pressure output is generated in the secondary windings 3b and 3c.

The outputs of the secondary windings 3b and 3c are full-wave rectified in rectifier circuits 6 and 7, respectively, and then smoothed in capacitors 7 and 8 to become direct current.

Then, the output of the rectifier circuit 6 is subjected to constant voltage control in a constant voltage circuit 14, and then converted to 50Hz, 100V in a DC-AC converter 16 and output. On the other hand, when the fin source switch 2 is closed, the non-voltage relay 4 and the timer relay 5 are activated, thereby opening the contact 4a and closing the contact 5a for a predetermined period of time, thereby charging the battery 17. If the commercial power supply is cut off for some reason, the non-voltage relay 4 is restored, the contact 4a is closed, and the output of the battery 17 is supplied to the DC-AC converter 16 until the commercial power supply is restored. continues to be used to form an uninterruptible power supply. On the other hand, when the DC power output is generated, the timer 20 is initial reset and generates an output after a certain period of time to prevent the malfunction output from the gas sensor 19 from being taken in when the power is turned on. In this state, if a gas leak occurs for some reason, the gas sensor 19 detects this leaked gas and a short circuit occurs.

As a result, relay 18 is activated and its contact 18a is closed. In this case, the output of the timer circuit 20 is already “H”
Therefore, the AND gate 21 generates a coincidence output, and along with this, the output of the inverter 22 becomes ``L''.
becomes. When the output of the inverter 22 becomes "L", the relay 23 is activated and its contact 23a is switched, and the output of the capacitor 24 in the charging state becomes latching 1" relay 26.
The latching relay 26 is mechanically held in the latching state. Furthermore, when the output of the inverter 22 becomes "L", the buzzer 75 is activated to issue an alarm in the monitoring area, and the gas leak indicator light 64 provided on the central monitoring panel 74 in the control room lights up. At the same time, the buzzer 70 of the central monitoring panel 74 also operates to warn of the occurrence of gas leakage. On the other hand, when the latching relay 26 is activated and held, its contact 26a switches from contact a to contact b.

As a result, the output of the DC-AC converter 16 is supplied to the geared motor 30 via the primary coil 28a of the transformer 28 and the microswitch 31. As a result, the guard motor 30 rotates, and the gas switch, which is in the open state, is operated in the direction to be closed. In this case, when the geared motor 30 operates and current flows, an output is also generated in the secondary winding 28b of the transformer 28, this output is rectified in the rectifier circuit 39, and further smoothed in the capacitor 40. The output of this rectifier circuit 39 is connected to a transistor 41 and turned on, and in conjunction with this, a relay 42 is activated. When the relay 42 operates, its contact 42a closes and the shut operation indicator light 47 lights up to indicate that the shut operation is in progress. Further, when the contact 42a closes, the output of the inverter 50 becomes "H" and the flip-flop 53 is reset. On the other hand, the guard motor 30
When the gas switch is rotated to close the gas switch, the movable piece a of the microswitch 31 is switched to the fixed contact c by a cam fixed to the shaft of the gas switch. As a result, the guard motor 30 stops its rotation. Further, when the microswitch 31 changes the rice and the current of the guard motor 30 is cut off, the output of the secondary coil 28b of the transformer 28 is also cut off. Therefore, the transistor 41 is turned off, the relay 42 is restored, and the contact 42a is accordingly opened. When the contact 42a becomes connected, the shut operation indicator light 47 goes out and the flip-flop 52 is set by the integral output outputted through the resistor 51. As a result, the set output of the flip-flop 52 is supplied via the inverter 54 to the shut-off indicator light 56, which lights up. Therefore, the person in the control room confirms that gas leakage has been prevented by confirming that the shut-off indicator light 56 provided on the central monitoring panel 74 is lit. Also,
By closing the buzzer stop switch 71, the operation of the buzzer 70 is stopped. Next, once the gas leak has been completely repaired, manually operate the latching relay 2.
6 will be restored. When the latching relay 26 is restored,
The contact 26a is connected to the fixed contact a. As a result,
The output of the DC-AC converter 16 flows through the path of the rear point 26a, the primary coil 27a of the transformer 27, the fixed contact c of the microswitch 31, and the guard motor 30, whereby the guard motor 30 rotates and drives the gas switch in the opening direction. In this case, when current flows through the geared motor 30, an output is also generated in the secondary winding 27b of the transformer 27, and this world power is rectified in the rectifier circuit 35, further smoothed in the capacitor 36, and then the transistor 37
is supplied to turn on transistor 37. When transistor 37 is turned on, relay 38 is driven, and as a result, contact 38a is opened. When the contact 38a is closed, the open operation indicator light 43 lights up to indicate that the gas switch is in the opening operation. Further, when the contact 38a becomes hot, the output of the inverter 46 becomes "H", the flip-flop 52 is reset, and the shut indicator light 56, which had been lit, goes out. Next, when the geared motor 30 rotates further and the gas switch is opened, the cam fixed to the shaft of the gas switch moves to the microswitch 31.
Switch to the state shown.

As a result, the current supply to the geared motor 30 is cut off and stopped. Furthermore, when the current supply to the geared motor 30 is cut off, the output of the secondary coil 27b of the transformer 27 is also cut off, and along with this, the relay 38 connected to the output side of the transistor 37 is restored. Contact point 38a serves as a barrier. When the contact point 38a becomes ugly, the open operation indicator light 43 goes out, the output of the resistor 47 becomes "H", and the flip-flop 53 is set. As a result, the set output of the flip-flop 53 is supplied to the open indicator lamp 601 via the inverter 55, and the open indicator lamp 601 is turned on. Therefore, the manager confirms that the gas switch has been opened by confirming that the open indicator light 60 on the middle monitoring panel 74 is lit. Note that the power indicator light 68 is for checking the output status of the constant voltage power source 14 and the battery 17,
If the DC power supply is cut off for some reason, the power indicator light 68 goes out to indicate that something is wrong. Further, 76 is a shirt switch that controls closing of the gas switch from the central monitoring panel side, and when this shirt switch 76 is closed, the relay 18 is forcibly driven and the gas sensor 19 is activated. A state similar to that occurs, and as a result, the gas switch is automatically closed in the same manner as in the case described above. Note that 77 is a shirt switch for closing gas switches in other monitoring areas. Furthermore, if it is desired to forcibly close the gas switch on the monitoring area side, this can be done by closing the shirt switch 34 and driving the guard motor 30.

As explained above, according to the automatic gas circuit breaker device according to the present invention, even during a power outage, by detecting a gas leak and activating the latching relay, the output of the latching relay can be used to activate the gas circuit breaker. Since the gas supply is automatically shut off and the gas passage is automatically controlled by restoring the latching relay, it has the excellent effect of completely and reliably dealing with gas leaks.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of the gas automatic circuit breaker device according to the present invention. la, lb...power terminal, 2...power switch, 3...
...Power transformer, 4...No-voltage relay, 5.
...Timer relay, 6,7... Rectifier circuit, 14... Constant voltage power supply, 16... DC-
AC converter, 17... battery, 18... relay, 19... gas sensor, 20... timer, 21...
AND gate, 22...inverter, 23...relay,
26...Latching relay, 27,28...Transformer,
30...Geared motor, 31...Micro switch,
35, 39... Rectifier circuit, 37, 41... Transistor, 38, 42... Relay, 43... Open operation indicator light, 47... Shut operation indicator light,
46,50...Inverter, 52,53...Flip-flop, 54,55...Inverter, 56...
...Shuttle indicator light, 60...Open indicator light, 64...Gas leak indicator light, 68...Power indicator light, 70,75...Buzzer, 76 ......
Shutter switch.

Claims (1)

[Claims] 1. A DC uninterruptible power supply, a DC-AC converter that converts the output of this DC uninterruptible power supply into alternating current, a gas sensor that uses the output of the DC uninterruptible power supply as a power source to detect gas leaks, and an output of this gas sensor. A latching relay that operates correspondingly, a latching relay contact connected to one end of the output of the DC-AC converter, and a first transformer in which a normal cross contact of the latching relay contact is connected to one end of the primary coil. and a second transformer in which the normally open contact of the latching relay contact is connected to one end of the primary coil, and the movable piece of the other end of the primary coil of the second transformer is in a connected state when the gas switch is opened. a micro switch connected to the contact and whose movable piece is switched and connected when the gas switch is closed;
A geared motor for opening and closing the gas switch, which has one end connected to the movable piece of the microswitch and the other end connected to the other end of the output of the DC-AC converter, and the latching relay contact. A shaft operation indicator light detects and displays the closing operation of the geared motor by the secondary coil output of the second transformer when the latching relay contact is connected to the normally open contact, and the latching relay contact is connected to the normally open contact. 1. An automatic gas shutoff device comprising: an open operation indicator light that detects and displays an opening operation of the geared motor using the secondary coil output of the first transformer when the geared motor is connected to the first transformer.