JPS62116826A - Gal leakage alarming device - Google Patents

Abstract

PURPOSE:To shut off forcibly a gas main valve even when leakage detection does not work at all by providing a transmitter with a disturbance detection circuit and driving the transmitting section according to signal output and transmitting a shut off signal when a disturbance is detected. CONSTITUTION:A transmitter 3 receives electric power of commercial AC 100V through an electric power source line P2 and an electric plug 4. When a gas leakage signal is judged from a gas leakage detector 1 or when it is judged that there is a disturbance on the gas leakage detector side or on the transmitter side, a radio shut off signal is transmitted through an antenna 5. Transmission waves from a transmitter 3 are received and the detection data contained in the detection information are judged. If s shut off signal is judged, a shut off signal that the gas main valve should be shut off is outputted. A gas pipe 10 is provided with a gas main valve 11, and the gas main valve 11 is provided with an electromagnetic valve 12. The electro-magnetic valve 12 is shut off signal from a receiver 9, and the gas main valve 11 is closed.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention operates a transmitter to transmit a cutoff signal not only when a gas leak detector detects a gas leak but also when a failure is detected, thereby shutting down the gas main valve. This invention relates to a gas leak alarm device with a fail-safe function that shuts off.

(Prior Art) In recent years, research and development of dregs leakage alarm devices installed in apartment complexes, condominiums, etc. have been promoted.

Conventional gas leak alarm systems are equipped with a gas leak detector that detects gas leaks inside the dwelling unit, a transmitter that reports an abnormality when the gas leak detector detects a gas leak, and a gas main valve is placed. One word sent outside the house! A receiver was installed to receive abnormality reports from several sources, and the main gas valve was shut off based on the command from the receiver that determined the abnormality report to ensure safety.

(Problem to be solved by the invention) However, gas leak detectors installed in residential units are powered by commercial AC 100V, and if the plug is intentionally unplugged or otherwise, gas leak detection cannot be detected at all. Although the system is equipped with a gas leak alarm system that automatically shuts off the gas in the event of an abnormality, there was a risk that this function would be completely lost and safety could not be guaranteed.

(Means for Solving the Problems) The present invention has been made in view of the above problems, and it can be used not only when gas leakage is detected, but also when gas leakage cannot be detected at all for some reason. An object of the present invention is to provide a highly safe gas leak alarm device equipped with a fail-safe function that automatically shuts off a waste valve.

To achieve this objective, the present invention drives a transmitter to transmit a cutoff signal when a transmitter determines a gas leakage signal from a gas leakage detector. In a gas leak alarm device that shuts off a gas main valve based on a command, a fault detection circuit for detecting a fault is provided in the transmitter ffN, and the transmitter is driven based on the signal output from the fault detection circuit, and when a fault is detected, It is designed to send a cutoff signal.

(Example) Fig. 1 is a block diagram showing the internal configuration of a transmitter, which is the main part of the present invention, and Fig. 2 is an overall configuration diagram of a gas leak alarm device configured using the transmitter shown in Fig. 1. be.

The configuration will be explained with reference to FIGS. 1 and 2. 1 is a gas leak detector, power line P1. Receives commercial AC 100V power supply via power plug 2, 12V when gas leak is detected, 6V during normal monitoring status, 0V when trouble is detected.
Outputs a voltage signal that becomes . 3 is a transmitter, and a power line P2. When receiving a commercial AC 100V power supply via the power plug 4 and determining a gas leak signal from the gas leak detector 1, or when determining a failure on the gas leak detector side or the transmitter side, it is shut off wirelessly. A signal is transmitted via antenna 5. The power plugs 2 and 4 have built-in detection mechanism units 6 and 7, respectively, that detect when the power plugs 2 and 4 are handled from an outlet installed indoors, and detect when the power plugs 2 and 4 are removed from the outlet. The signals are output to the transmitter 3 via signal lines L1 and L2, respectively. Therefore, it is desirable that the power plugs 2 and 4 be inserted independently into electrical outlets installed indoors.

The internal structure of the power plugs 2 and 4 will be explained using the power plug 2 as a representative. FIG. 3 (A) is a perspective view of the power plug 2, and FIG. 3 (B) is a cross-sectional view thereof. 22
b is a contact terminal that is inserted into an outlet installed indoors, and a power line P1 is connected to the other end of each of the contact terminals 22a and 22b. 23 is power plug 2
There is a protrusion that is slidable in the axial direction in the cylindrical part provided in the
A shaft 24 is fixed to the protrusion 23, and the spring force of a spring 25 provided in the cylindrical portion of the power plug 2 urges the protrusion 23 to protrude outward from the power plug 2. When the power plug 2 is inserted into an outlet provided on a wall or the like, the protrusion 23 comes into contact with the wall and pushes the shaft 24 back to the left side against the spring force of the spring 26.
A conductor piece 26 fixed to the tip of the contact piece 27a and 27b is brought into contact with both of the contact pieces 27a and 27b to short-circuit the contact pieces 27a and 27b.

A signal line L1 is connected to the other end of each of the contact pieces 27a and 27b.

Referring again to FIG. 2, a receiver 9 equipped with a receiving antenna 8 is provided outside the dwelling unit shown on the right side, receives the transmitted radio waves from the transmitter 3, reproduces the detected information, and reproduces the detected information. The detected content is determined from the address and data sent, and when a shut-off signal is determined, a shut-off signal is output to shut off the gas main valve. The gas pipe 10 is provided with a gas main valve 11, and the gas main valve 11 is provided with a solenoid valve 12 that opens and closes the main valve. 11 is cut off.

Next, the internal configuration of the transmitter 3 will be explained with reference to FIG.

Reference numeral 13 denotes a discrimination circuit, which includes a voltage comparator therein, and discriminates the detection state based on the voltage signal from the gas leak detector 1. That is, when it is determined that the gas leak output from the gas leak detector 1 is 12V, a gas leak signal is output to the transmitter 14, and when it is determined that the voltage signal from the gas leak detector 1 has decreased to 0V. , is outputted to the "L" level output failure detection circuit 18 as a trouble signal. The transmitter 14 includes a transmitter control circuit 15, a data code setting circuit 16, and a modulation oscillation circuit 17.
3 or transmits a wireless cutoff signal via the antenna 5 based on the signal output from the failure detection circuit 18. The transmission control circuit 15 has a built-in timer circuit, which starts timer operation based on the signal output from the discrimination circuit 13 or the fault detection circuit 18, and modulates and oscillates the power supply voltage for a predetermined time T1 determined by the timer circuit. By supplying the signal to the circuit 17, the transmission time T4 of the transmitter 14 is set. The data code setting circuit 16 sets a data code as an information pulse containing its own address and data based on the signal output from the discrimination circuit 13 and the fault detection circuit 18. The modulation oscillation circuit 17 receives power supply from the transmission control circuit 15 and operates only during a predetermined transmission time T1,
Frequency modulation is performed based on the data code from the data code setting circuit 16.

Next, the internal configuration of the failure detection circuit 18 will be explained with reference to FIG. The signal output from the discrimination circuit 13 is sent to the inverter 4.
1 to the OR circuit 44, and each signal line drawn out from the detection mechanism parts 6 and 7 built into the power plugs 2 and 4 is connected to a predetermined voltage VL, for example, 5V, via a resistor R. When the power plug 2 or 4 is removed from the outlet, the corresponding detection mechanism section 6 or 7 opens, causing the OR circuit 44 to receive a voltage of 1 or 1.
Give H1 Lebel. The OR output from the OR circuit 44 is output to the transmission control circuit 15 and the data code setting circuit 16.

Referring again to FIG. 1, 19 is a power supply unit, which includes a DC power supply circuit 20 that adjusts the commercial power supply A0100V to a predetermined DC voltage and a charging circuit 21 that charges the DC power supply voltage from the DC power supply circuit 20. ing. By providing this charging circuit 21, even if the power plug 4 is handled from the outlet and the commercial power supply AC100V is cut off, the charging voltage charged in the charging circuit 21 is maintained for a predetermined time set longer than the transmission time T1. It is supplied to the data code setting circuit 16 and modulation oscillation circuit 17 for backup.

Next, the internal configuration of the receiver 9 will be explained with reference to FIG.

A receiving circuit 30 receives transmitted information from the transmitter 3 obtained through the receiving antenna 8, detects the received information, and outputs a digital signal corresponding to the data code included in the transmitted information. 31 generates a pulse by shaping the digital signal from the receiving circuit 30, that is, a data code, and verifies the address included in the pulse-regenerated information pulse. When it determines that the address matches its own address, it outputs the data code. It decodes and outputs a processed signal based on the decoding result. Reference numeral 32 denotes a starting circuit that controls starting of the solenoid valve 12 provided in the gas main valve 11 based on the signal output from the code processing circuit 31. A power supply control circuit 33 is provided as a means for setting an intermittent reception frame time T3 in the reception circuit 30. That is, the power supply control circuit 33 includes a timer circuit that is set to an interval time T2 that is shorter than the transmission time lower 1, and a timer circuit that is set to a reception frame time T3 that is shorter than the interval T2. A power supply voltage from a power supply circuit 34 using a power supply circuit 34 is supplied to the reception circuit 30 only during a predetermined reception frame time T3 at every interval time T2. In addition, when the code processing circuit 31 receives the reception output from the reception circuit 30, it starts the built-in retrigable timer, gives the output of the retriggable timer to the power supply control circuit 33, and waits for the reception time T3 to elapse. The power supply voltage is supplied to the receiving circuit 30 during a fixed holding time period T4 determined by the re-triggerable timer, and the receiving circuit 30 is maintained in a receivable state. 35 is a battery voltage drop detection circuit, and when the battery voltage of the power supply circuit 34 drops below a certain level, a built-in LED is turned on to indicate that the battery voltage has dropped.

FIG. 6 is a timing chart showing the operation of the present invention.

The operation will be explained with reference to FIG. First, to explain the case where the power plug 4 is removed from the outlet as a failure on the transmitter side, as an example, as shown in FIG. 6, at time t1, when the power plug 4 on the transmitter side is removed from the outlet As shown in FIG. 4, the detection mechanism section 7 built into the power plug 4 is activated, and the contact pieces 27a and 27t are opened, thereby outputting a "tobil bell" to the OR circuit 44.

The failure detection circuit 18 transmits the OR output from the OR circuit 44 to the control circuit 15 and the data code setting circuit 1.
6 to drive the transmitter 14, and repeatedly transmit by radio a cutoff signal to cut off the gas main valve over a predetermined transmission time T1.

On the receiver 9 side, when receiving the transmission information from the transmitter 3 in a predetermined reception frame time T3 that is set intermittently, the receiver 9 side maintains the reception state for a predetermined time T4, and then transmits the information from the transmitter 3. Reliably receive transmitted information.

When the receiver 9 decodes the transmitted information and determines that it is a cutoff signal to shut off the gas main valve, the solenoid valve 12 is turned off and the gas main valve 11 is shut off.

Next, a case where the signal line between the gas leak detector 1 and the transmission@3 is disconnected will be explained as an example of a failure on the gas leak detector 1 side. As shown in FIG. 6, at time [2,
If the signal line between the gas leak detector 1 and the transmitter 3 is disconnected, the voltage signal from the gas leak detector 1 will drop to zero V in the discrimination circuit 13, so the jl L tobilbell output will be sent to the fault detection circuit. Output to 18. In the fault detection circuit 18, as shown in FIG.
The LH level output is inverted by the inverter 41 and
The level output is given to the OR circuit 44. As in the case of detecting a fault on the transmitter side described above, the transmitter 14 detects a fault in the fault detection circuit 1.
Transmission of a cutoff signal is started based on the signal output from B.

FIG. 7 is a circuit diagram showing another embodiment of the failure detection circuit 18 shown in FIG. 1.

The embodiment shown in FIG. 7 is characterized in that, in the event of a power outage of the commercial power supply, the transmission of a cutoff signal from the transmission method is prohibited.

Specifically, 46 is a comparator, which compares the signal voltage from the gas leak detector 1 with the voltage V2, for example, 5 V as a reference voltage, and determines that the signal voltage from the gas leak detector 1 is 5 V.
Above, that is, normal storage voltage 6V or gas leakage voltage 1
If the voltage is 2V, it is supplied with power from a commercial power source, so that the AND circuit 50 outputs "H" to one input terminal. Further, the other input terminal of the AND circuit 50 is given a signal from the detection mechanism section 7 on the transmitter 3 side, and when the power plug 4 on the transmitter 3 side is handled from the outlet, the detection mechanism section 7 is opened. A commercial power supply monitoring circuit 49 is provided to monitor the presence or absence of a commercial power supply on the transmitter 3 side.To be more specific, the commercial power supply monitoring circuit 49 outputs "H" to the AND circuit 50. The charging circuit has a built-in comparator and compares the DC power supply voltage from the DC power supply circuit 20 with the reference voltage, and if the commercial power supply A0100V is cut off, the output voltage from the DC power supply circuit 20 will immediately drop. 21, and outputs the HIT level to one input terminal of the AND circuit 51.The other input terminal of the AND circuit 51 receives a signal from the detection mechanism section 6 on the gas leak detector 1 side. A detection signal is given, and when the power plug 2 on the gas leak detector 1 side is removed from the outlet, the detection mechanism section 6 opens and the AND circuit 5
1 outputs a "tobilbell". 52 is an OR circuit, and outputs the OR output from the AND circuits 50 and 51 to the transmission control circuit 15 and the data code setting circuit 16.

FIG. 8 is a timing chart showing the operation when the embodiment of FIG. 7 is used. As shown at time 3 in FIG. 8, the gas leak detector When the power plug 2 on the first side is pulled to the center, an AND output is obtained from the AND circuit 51, thereby driving the transmitter 14 to start transmitting the cutoff signal.

Also, as shown at time t4 in FIG.
When a power outage occurs at V, the J: urchin AND AND circuits 50 and 51 shown in FIG. Prohibit the transmission of

Incidentally, in the above embodiment, the transmission information from the transmitter 3 is configured to be transmitted to the receiver 9 wirelessly, but it is also possible to connect the transmitter 3 and the receiver 9 with a signal line and transmit the transmission information by wire. It may be configured to do so.

In addition, the receiver 9 installed outside the residence has a built-in battery, and is configured to be able to receive data only within the reception time slot set intermittently in order to reduce battery power consumption. When the best power supply is available, the receiver 9 is set to be able to receive signals at all times, that is, to enable continuous reception, and when the transmitter 3 detects a gas leak or determines a failure, it continues to receive data. If configured to transmit a cutoff signal, reliability will be further improved.

(Effects of the Invention) As described above, according to the present invention, when the gas leak signal from the gas leak detector is determined by the transmitter, the transmitter is driven to transmit a cut-off signal, and the cut-off signal from the transmitter is transmitted. In a gas leak alarm device that shuts off a gas main valve based on a command from a receiver that receives a signal, the transmitter is equipped with a fault detection circuit that detects a fault, and the transmitter is activated based on the signal output from the fault detection circuit. By transmitting a shutoff signal when a failure is detected, the main gas valve can be forcibly shut off not only when gas leakage is detected, but also when gas leakage cannot be detected at all for some reason. Therefore, a highly safe gas leak alarm system equipped with Fehrleif function can be obtained.

Further, by prohibiting the shutoff of the waste source stopper during a power outage of the commercial power supply, the effect that the waste stopper is opened even during a power outage and the waste can be used as usual can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the main part of the present invention,
2 is an overall configuration diagram of the present invention, FIG. 3 is an explanatory diagram of the detection mechanism section of FIG. 2, FIG. 4 is a circuit diagram showing an embodiment of the fault detection circuit of FIG. 1, and FIG. 5 is an internal configuration diagram of the receiver shown in FIG. 2, FIG. 6 is an explanatory diagram showing the operation of the present invention when the embodiment of FIG. 4 is used, and FIG. FIG. 8, a circuit diagram showing another embodiment, is an explanatory diagram showing the operation of the present invention when the embodiment of FIG. 7 is used. 1: Gas leak detector 2.4: Power plug 3: Transmitter 5.8: Antenna 6.7: Detection mechanism section 9: Receiver 10: Gas pipe 11: Gas main valve 12: Solenoid valve 13: Discrimination circuit 14: Transmitter 15: Transmission control circuit 16: Data code setting circuit 17: Modulation oscillation circuit 18: Failure detection circuit 19: Power supply circuit 20: DC power supply circuit 21: Charging circuits 22a, 22b: Contact terminal 23 Two prongs 24: Shaft 25 : Spring 26: Conductive pieces 27a, 27b: Contact piece 30: Receiving circuit 31: Code processing circuit 32: Starting circuit 33: Power supply control circuit 34: Power supply circuit 35: Battery voltage drop detection circuit

Claims (1)

[Scope of Claims] A gas leak detector that detects a gas leak and outputs a gas leak signal, and a transmitter that drives a transmitter to transmit a cutoff signal when the gas leak signal from the gas leak detector is determined. machine and
In a gas leak alarm device comprising a receiver that receives a cutoff signal from the transmitter and shuts off the gas main valve, the transmitter includes a failure detection unit that detects a failure on the gas leak detector side or the transmitter side. A gas leak alarm device characterized in that a circuit is provided, the transmitter is driven based on a signal output from the fault detection circuit, and a cutoff signal is transmitted when a fault is detected.