JPH0660738B2 - Gas leak alarm device - Google Patents

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 gas leak is detected. The present invention relates to a gas leak alarm device having a fail-safe function for shutting off a gas.

(Prior Art) In recent years, research and development of a gas leak alarm device installed in an apartment house, a condominium or the like has been promoted.

As a conventional gas leak alarm device, a gas leak detector that detects a gas leak in a dwelling unit and a transmitter that reports an abnormality when the gas leak detector detects a gas leak are installed, and a gas tap is placed. A receiver was installed outside the dwelling unit to receive an abnormality report from the transmitter, and safety was ensured by shutting off the gas main plug based on a command from the receiver that identified the abnormality report.

(Problems to be solved by the invention) However, when the gas leak detector installed in the dwelling unit uses a commercial AC100V as a driving power source, and the gas leak is detected at all by intentionally unplugging the gas leak detector. Although the automatic leak shutoff function is provided by the gas leak alarm device, the mechanism is completely lost, and there is a risk that safety cannot be guaranteed.

(Means for Solving Problems) The present invention has been made in view of the above problems, and is compulsory not only when detecting a gas leak, but also when a gas leak cannot be detected at all due to some cause. It is an object of the present invention to provide a highly safe gas leak alarm device having a fail sase function that shuts off a gas main valve.

To achieve this object, the present invention provides a gas leak detector that outputs different detection signals according to the respective states during normal times, when detecting a gas leak, and when detecting a failure such as power failure, and the gas leak detector. Gas leak alarm device including a transmitter that drives a transmitter to transmit a cutoff signal when a gas leak signal of the other is determined, and a receiver that receives the cutoff signal from the transmitter and shuts off the gas main plug In the above, the transmitter is supplied with a commercial power supply via a power plug, adjusts to a predetermined DC voltage, supplies a DC power supply to each circuit, and charges a DC power supply voltage from the DC power supply circuit. The fault detection circuit is provided with a charging circuit and a fault detection circuit that detects a fault by receiving a detection signal from a detection unit that detects that the power plug is unplugged from an outlet or a fault signal from the gas leak detector. The transmitter is driven based on the signal output from the device, and a cutoff signal is transmitted when a failure is detected.

(Embodiment) FIG. 1 is a block diagram showing an internal configuration of a transmitter which is a main part of the present invention, and FIG. 2 is an overall configuration diagram of a gas leak alarm device configured by using the transmitter of FIG. is there.

The configuration will be described with reference to FIG. 1 and FIG. 2. Reference numeral 1 is a gas leak detector, which receives a commercial AC 100V power supply via a power line P1 and a power plug 2 and is normally 12V when a gas leak is detected. 6V in the monitoring state of, and 0V in the case of trouble detection
And outputs a voltage signal. Reference numeral 3 denotes a transmitter, which receives a power supply of commercial AC100V through the power plug P2 and the power plug 4, and when a gas leak signal from the gas leak detector 1 is discriminated, or on the gas leak detector side or the transmitter side. When the failure is determined, the wireless cutoff signal is transmitted via the antenna 5. Each of the power plugs 2 and 4 has a built-in detection mechanism section 6 and 7 for detecting that each power plug 2 or 4 has been unplugged from an outlet provided indoors, and outputs a detection signal indicating that the plug has been unplugged from the outlet. The signal is output to the transmitter 3 via the signal lines L1 and L2, respectively. Therefore, it is desirable that the power source plugs 2 and 4 be independently inserted into outlets provided indoors.

The internal structure of the power plugs 2 and 4 will be described by taking 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 sectional view thereof. 22a and 2
Reference numeral 2b is a contact terminal that is plugged into an outlet provided indoors, and the power supply line P1 is connected to the other end side of each of the contact terminals 22a and 22b. Reference numeral 23 denotes a protrusion that is axially slidable in a cylindrical portion provided in the power plug 2. A shaft 24 is fixed to the protrusion 23, and a spring force of a spring 25 provided in the cylindrical portion of the power plug 2 causes the protrusion to move. The protrusion 23 is urged so as to protrude outward of the power plug 2. When the power plug 2 is inserted into an outlet provided on a wall surface or the like, the protrusion 23 abuts on the wall surface and pushes the shaft 24 back toward the left side against the spring force of the spring 26, and the conductor piece fixed to the tip of the shaft 24. 26 to the contact pieces 17a and 2
7b is contacted, and the contacts 27a and 27b are short-circuited. 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 provided with a receiving antenna 8 is provided outside the dwelling unit shown on the right side, receives a radio wave transmitted from the transmitter 3 to reproduce detection information, and includes the detection information. The detected content is discriminated from the address and data to be provided, and when the interception signal is discriminated, the interception signal for intercepting the gas mains is output. The gas pipe 10 is provided with a gas valve 11, and the gas valve 11 is provided with a solenoid valve 12 for opening and closing the valve. By turning off the solenoid valve 12 based on a cutoff signal from the receiver 9, the gas valve 11 is closed. Shut off 11.

Next, the internal configuration of the transmitter 3 will be described with reference to FIG.
Reference numeral 13 is a determination circuit, which has a voltage comparator inside and determines the detection state based on the voltage signal from the gas leak detector 1. That is, when it is determined from the gas leak output 12V from the gas leak detector 1 that a gas leak signal is output to the transmission unit 14 and it is determined that the voltage signal from the gas leak detector 1 has dropped to 0V. Then, the "L" level output as a trouble signal is output to the fault detection circuit 18. The transmitter 14 includes a transmission control circuit 15, a data code setting circuit 16, and a modulation / oscillation circuit 17, and transmits a wireless cutoff signal through the antenna 5 based on a signal output from the discrimination circuit 13 or the fault detection circuit 18. . The transmission control circuit 15 has a built-in timer circuit, starts the 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. Circuit 1
7, the transmission time T4 of the transmitter 14 is set. The data code setting circuit 16 sets a data code as an information pulse including its own address and data based on the signal output from the discrimination circuit 13 and the failure detection circuit 18. The modulation oscillation circuit 17 is the transmission control circuit 1
When the power is supplied from the power supply circuit 5, the circuit operates only for a predetermined transmission time T1, and frequency modulation is performed based on the data code from the data code setting circuit 16.

Next, the internal configuration of the fault detection circuit 18 will be described with reference to FIG. The signal output from the discrimination circuit 13 is given to the logical sum circuit 44 via the inverter 41, and a resistance R is provided to each signal line drawn from the detection mechanism units 6 and 7 built in the power plugs 2 and 4. Through the predetermined voltage V
1, for example, 5V, when the power plug 2 or 4 is unplugged from the outlet, the corresponding detection mechanism 6
Or, when 7 is opened, the voltage V1 is applied to the OR circuit 44.
That is, the "H" level is given. The logical sum output from the logical sum circuit 44 is output to the transmission control circuit 15 and the data code setting circuit 16.

Referring again to FIG. 1, reference numeral 19 denotes a power supply unit, which includes a DC power supply circuit 20 for adjusting the commercial power supply AC100V to a predetermined DC voltage and a charging circuit 21 for charging the DC power supply voltage from the DC power supply circuit 20. ing. By providing this charging circuit 21, even if the power supply plug 4 is pulled out of the outlet and the commercial power supply AC100V is cut off, the charging voltage charged in the charging circuit 21 is kept for a predetermined time longer than the transmission time T1. The code is supplied to the code setting circuit 16 and the modulation / oscillation circuit 17 to boost up.

Next, the internal configuration of the receiver 9 will be described with reference to FIG. A receiving circuit 30 receives the transmission information from the transmitter 3 obtained via the reception antenna 8, detects the reception information, and outputs a digital signal corresponding to the data code included in the transmission information. Reference numeral 31 denotes a digital signal from the receiving circuit 30, that is, a waveform of a data code is generated, pulse reproduction is performed, an address included in the information pulse that is pulse-reproduced is collated, and a data code for determining that the address coincides with its own address is displayed. Decode and output a processed signal based on the result of the decryption. Reference numeral 32 is a start-up circuit that controls the start-up of the solenoid valve 12 provided in the gas tap 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 window time T3 in the reception circuit 30. That is, the power supply control circuit 33 incorporates a timer circuit set to an interval time T2 shorter than the transmission time T1 and a timer circuit set to a reception window time T3 shorter than the interval T2, respectively, and uses a battery. The power supply voltage from the power supply circuit 34 is supplied to the receiving circuit 30 every interval time T2 only during a predetermined reception window time T3. Further, when the reception output from the reception circuit 30 is obtained, the code processing circuit 31 gives the output of the built-in retriggerable timer to the power supply control circuit 33, and even if the reception window time T3 elapses, it is determined by the retriggerable timer. The power supply voltage is supplied to the receiving circuit 30 during the holding time T4 of 1 to hold the receivable state. Reference numeral 35 denotes a battery voltage drop detection circuit, which lights an LED incorporated therein to decrease the battery voltage of the power supply circuit 34 below a certain level to display that the battery voltage has dropped.

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

The operation will be described with reference to FIG. First, a case in which the power plug 4 is unplugged from the outlet as a failure on the transmitter side will be described as an example. When the power plug 4 on the transmitter side is unplugged from the outlet at time t1 as shown in FIG. 6, As shown in FIG. 4, the detection mechanism section 7 incorporated in the power plug 4 is activated and the contact pieces 27a and 27b are opened to output a level to "H" to the logical sum circuit 44.
The failure detection circuit 18 sends the logical sum output from the logical sum circuit 44 to the transmission control circuit 15 and the data code setting circuit 1.
6 to drive the transmitter 14, and sends out a cutoff signal for cutting off the gas mains over a predetermined transmission time T1 by radio. On the receiver 9 side, when the transmission information from the transmitter 3 is received within a predetermined reception window time T3 which is intermittently set, the reception state is held for a predetermined time T4, and the reception state from the transmitter 3 is received. Be sure to receive the transmitted information. When the receiver 9 decodes the transmission information and determines that the signal is a cutoff signal for shutting off the gas tap, the solenoid valve 12 is turned off and the gas tap 11 is shut off.

Next, a case where the signal line between the gas leak detector 1 and the transmitter 3 is broken will be described as an example of a fault on the gas leak detector 1 side. If the signal line between the gas leak detector 1 and the transmitter 3 is broken at time t2 as shown in FIG. 6, the discrimination circuit 13 determines that the voltage signal from the gas leak detector 1 is zero V. Therefore, the "L" level output is output to the fault detection circuit 18. Fault detection circuit 18
Then, as shown in FIG. 4, "L" from the discrimination circuit 13
The level output is inverted by the inverter 41 and given to the "H" level output OR circuit 44. Similar to the above-described failure detection on the transmitter side, the transmitter 14 starts transmitting the cutoff signal based on the signal output from the failure detection circuit 18.

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

The embodiment shown in FIG. 7 is characterized in that the transmission of the cutoff signal from the transmitter is prohibited during a power failure of the commercial power source.

Specifically, reference numeral 46 is a comparator, which compares V2, for example, a voltage of 5V as a reference voltage, with a signal voltage from the gas leak detector 1, and outputs a signal voltage from the gas leak detector 1 of 5V.
More than the above, that is, the normal monitoring voltage 6V or the gas leakage voltage 1
When the voltage is 2V, the power is supplied from the commercial power source, so that the "H" level is output to one input terminal of the AND circuit 50. Further, the other input terminal of the logic circuit 50 is given a signal from the detection mechanism section 7 on the transmitter 3 side. When the power plug 4 on the transmitter 3 side is unplugged from the outlet, the detection mechanism section 7 opens. And outputs an "H" level to the AND circuit 50. Further, a commercial power supply monitoring circuit 49 for monitoring the presence or absence of commercial power supply on the transmitter 3 side is provided. More specifically, the commercial power supply monitoring circuit 49 has a built-in voltage comparator, which compares the direct current power supply voltage from the direct current power supply circuit 20 with a reference voltage. When the commercial power supply AC100V is cut off, the direct current power supply circuit 20 outputs the voltage. Since the output voltage of 1 is immediately lowered, it is driven by the charging voltage from the charging circuit 21, and the "H" level is output to one input terminal of the AND circuit 51.
The gas leak detector 1 is connected to the other input terminal of the AND circuit 51.
The detection signal from the detection mechanism section 6 on the side is given. When the power plug 2 on the gas leak detector 1 side is unplugged from the outlet, the detection mechanism section 6 is opened and "H" is given to the AND circuit 51.
Output level. A logical sum circuit 52 outputs the logical output from the logical product 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 t3 in FIG. 8, the gas leak detector is in a state where the commercial power source AC100V is supplied, that is, in the state where the “H” level output from the commercial power source monitoring circuit 49 is obtained. When the power plug 2 on the first side is pulled out, a logical product output is obtained from the logical product circuit 51 to drive the transmitter 14 to start transmission of the cutoff signal.

Further, as shown at time t4 in FIG.
When a power failure of V occurs, as shown in FIG. 7, the logical product outputs are not obtained in the logical product circuits 50 and 51, so that the signal output to the transmission unit 14 is blocked and the cutoff signal is output. Prohibit sending.

Although the transmission information from the transmitter 3 is wirelessly transmitted to the receiver 9 in the above embodiment, the transmission information is transmitted by wire by connecting the transmitter 3 and the receiver 9 with a signal line. It may be configured to do so.

In addition, the receiver 9 installed outside the dwelling unit has a built-in battery and is configured to be able to receive only during the reception frame time set intermittently in order to reduce the consumption of battery power. When a large capacity power supply can be obtained, the receiver 9 is set to be able to always receive, that is, set to the continuously receivable state, and when the transmitter 3 detects a gas leak or determines a failure, it is continuously shut off. The reliability is further improved when the signal is transmitted.

(Effects of the Invention) As described above, according to the present invention, a gas leak detector that outputs different detection signals according to the respective states during normal operation, when gas leakage is detected, and when a failure such as power failure is detected. A transmitter that drives a transmitter to transmit a cutoff signal when a gas leak signal from the gas leak detector is determined, and a receiver that receives the cutoff signal from the transmitter and shuts off the gas mains In the gas leak alarm device comprising: a transmitter, a DC power supply circuit that receives commercial power supply through a power plug, adjusts to a predetermined DC voltage, and supplies power to each circuit; A charging circuit for charging the DC power supply voltage, and a failure detection circuit for detecting a failure in response to a detection signal from a detection unit for detecting that the power plug is unplugged or a failure signal from the gas leak detector. Since the transmission unit is driven based on the signal output from the fault detection circuit and the cutoff signal is transmitted when the fault is detected, the gas leak cannot be detected for some reason as well as the dust leak detection. Even if it falls into a state, the gas main plug can be forcibly shut off, and a highly safe gas leak warning device having a fail-safe function can be obtained.

Even if the power plug on the transmitter side is unplugged from the outlet and the commercial power supply is cut off, the charging voltage charged in the charging circuit can be backed up by supplying it to each circuit for a predetermined time set longer than the transmission time. .

[Brief description 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. 2 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. 7 is another diagram of the fault detection circuit of FIG. FIG. 8 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 9: Receiver 10: Gas pipe 11: Gas main plug 12: Solenoid valve 13: Discrimination circuit 14: Transmitter 15: Transmission control circuit 16: Data code setting circuit 17: Modulation oscillating circuit 18: Fault detection circuit 19: Power supply circuit 20: DC power supply circuit 21: Charging circuit 22a, 22b: Contact terminal 23: Protrusion 24: Shaft 25 : Spring 26: Conductive piece 27a, 27b: Contact piece 30: Reception 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)

[Claims] 1. A gas leak detector that outputs different detection signals according to the respective states during normal times, when a gas leak is detected, and when a failure such as power failure is detected, and a gas leak signal from the gas leak detector. A gas leak alarm device comprising: a transmitter that drives a transmission unit to transmit a cutoff signal when determined; and a receiver that receives a cutoff signal from the transmitter and cuts off a gas main plug, wherein the transmitter In addition, a DC power supply circuit that receives commercial power supply via the power plug, adjusts to a predetermined DC voltage, and supplies power to each circuit,
A failure is detected by receiving a charging circuit for charging a DC power supply voltage from the DC power supply circuit and a detection signal from a detection unit that detects that the power plug is unplugged from an outlet or a failure signal from the gas leak detector. A gas leak alarm device, characterized in that a fault detection circuit is provided, the transmission unit is driven based on a signal output from the fault detection circuit, and a cutoff signal is transmitted when a fault is detected.