JPS60195696A - Alarm for gas leakage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to alarm equipment for gas leaks, etc., which transmits three-value signals, such as a trouble signal, a monitoring signal, and an alarm signal, to a central receiver using a small number of electrical circuits, such as a gas leak detector. be.

The currently popular gas leak detectors are each equipped with at least a power supply circuit and a gas detection circuit, and output an Ov trouble signal when the itt source is cut off, and a 6V #! signal when monitoring. The configuration is such that when a gas leak occurs, a 12V alarm signal is transmitted to the receiver tc along a pair of signal lines.

If multiple detectors are connected in parallel to the signal line of ``-'', the trouble signals of each detector are extracted and the same signal is sent.
Even if there is a normal detector in the power line, the signal 'tilt' will force the voltage of the line to go from 6V to OVK and transmit the trouble signal to the receiver, and while this trouble signal is being generated, the trap will be activated. Some proposals have been made in which when a normal gas leak detector detects a gas leak and generates an alarm signal, the above state is canceled and the alarm signal is transmitted to the receiver. However, in the case of ic@ created like this, (m number'
As many resistive loads as the number of detectors connected in parallel to the turtle path will be connected to the power line, if the number exceeds the predetermined number, the line impedance will drop and the signal will not be accurately transmitted to the receiver. there were.

With this invention, even if a large number of detectors are connected in parallel to the same signal line, the impedance of the signal line does not change, and trouble signals, monitoring signals, and tube axis signals are accurately transmitted to the receiver at equal pressure. The purpose is to obtain iiF reporting equipment for leaks, etc.

Below, nine cases in which this invention is used as a repeater will be explained. Fig. 1 is a block diagram showing the relationship between a repeater, a gas leak detector, and a receiver. G1-G3 are gas leak detectors, each equipped with a power supply circuit and a gas detection circuit, and when the power is cut off. It is configured to output a trouble signal of Ov, a monitoring signal of 6V which is a first predetermined voltage in a normal monitoring state, and an iF multiplication signal of 12V which is a second predetermined voltage when a gas leak is detected. . And there are 7 different alerts forming AK#'i 2 pieces, shop B and CKI-j.
Three gas leak detectors are provided for each, and these are connected via a pair of signal lines t to repeaters Xa, Xb+Xc provided for each control area, and further via a common pair of signal lines t. The repeaters Xa, Xb, and Xc connected to the central receiver Re are connected to the same warning area, as shown in Figure 2, where the repeater X to which three gas leak detectors are connected is shown. 3 corresponding to sand bed gas leak detector 01~G3
A set of blocks 1 to 3 having the same structure is provided. Each block 1 to 3 is provided with positive and negative input terminals p and n for connecting a pair of signal lines t of gas leak detectors 01 to G3, respectively, and a first switching circuit Sl and a second switching circuit are connected between each terminal p+n.
The first switching circuit S] is provided with a switching circuit S2 and a series resistance R] between the terminals P1+''.*
Transistor Q1 whose base is connected to the connection point of R2
and a transistor Q2 connected between J' + P2 through a diode DI and turned on when the transistor Q1 turns on.The second switching circuit S2 has a resistor R3+R4 between terminals p and n. A zener diode ZD is connected in series with a zener diode ZD that becomes conductive when a voltage of 12V is applied between terminals p and n.
A transistor Q3 whose base is connected to the connection point between the transistor Q3 and the resistor R4, and a transistor Q4, which is connected to this transistor Q3 and turns on when the transistor Q3 turns on, are connected between the terminal p and the diode D2 between P3 and 24. Ru.

Furthermore, among the terminals of each block 1, 2.3, the terminal PI of block 1 is its own terminal pK, and the terminal P1 of block 2.3
is terminal P21C of blocks 1 and 2, terminal P2 of block 3 is connected to its own terminal P4, terminal P4 of blocks 1 and 2 is connected to terminal P3Vc of blocks 2 and 3, block 1
and terminal N of 2, terminal Nl of 2H blocks 2 and 3
K1 and terminal P3 of block l. N11C is connected to a common pair of signal lines and further connected to the receiver Re. In the case of the repeater Xa, the repeater is composed of blocks 1 and 2, the terminal P2 of block 2 is connected to its own terminal P4, and the terminal N2 is left unconnected.

Next, let us clarify the operation of the above embodiment. Each oath area A-CK
While the installed gas leak detectors 01 to G3 are functioning normally and monitoring gas leaks, they are connected to the blocks 1 to 3 of the associated repeaters X & ~Xc (see Figure 2 below) through the signal line t. ) continues to send a 6V monitoring signal between terminals p and n.

Therefore, all detectors 01~G of each repeater X&~Xc
3 is normally monitoring, the transistor Q1 of the switching circuit S1 of the block 1 is turned on by the 6V monitoring signal of the detector c1, turning on the transistor Q2. By turning on this transistor Q2, the monitoring signal of the detector G1 is passed through the transistor Q2 and the diode D2 to the transistor QII of the switching circuit S1 of block 2.
C is sent, transistors Q1+Q2 turn on, and detector G2 monitors 4%! -4'; passes through transistor Q2 and diode D] and is sent to transistor QIK of switching circuit S] of block 3. Similar to block 2, transistors Q 1 + Q g are turned on, and the monitoring signal of detector G3, representing the associated repeater, is activated by transistors Q 2 . Diode D1. ReK is sent to the receiver through terminals P41P3 and the dedicated signal line, and this monitoring signal is detected by a detection circuit (not shown), and the gas leak detectors 01 to G3 in the warning area of the repeater continue to monitor normally. is displayed. Further, for example, when the gas leak detector Gl in the warning area B detects a gas leak and sends a 12V alarm signal to the repeater XbI/C, the Zener diode ZD of the switching circuit 52 of the block I of the repeater xb becomes conductive and the transistor Q3 and G4 are turned on, and the alarm signal from the detector G1, which has a higher voltage than the monitoring signal, is transmitted to the receiver through the transistor Q4, diode D2, and dedicated signal line L (see Figure 1 below), and is transmitted to the receiver by the detection circuit. It is displayed that a gas leak has been detected and has occurred in warning area B.

In addition, while the gas leak detector continues to monitor normally,
Ti of gas leak detector G2 in warning area C is shut off OV
When Trouble No. 48 is sent to block 2 of repeater The switching circuit 51 is also turned off, and the monitoring signals of the other normal detectors G1 and G3 are prohibited from being transmitted to the receiver.

Therefore, the OV trouble signal is transmitted from the repeater xb to the receiver ReK through the common signal line L (see Figure 1 below), and is detected by the detection circuit and detected by the detector G in the warning area C]~
If one of the G3's has failed or not, it will be displayed 0 Even in such a busy state, if the other gas leak detector G3 in warning zone 8 C detects a gas leak and sends out a 12V alarm signal, Switching circuit 8 of block 3 of relay 6
2 (see Figure 2 below) turns on, and transistor Q4
．． An alarm signal is transmitted to the receiver ReK with priority over the monitoring signal and trouble signal sent from the current detector G 1 + G 2 through the diode D 2 and the signal line,
Detected by the detection circuit, the occurrence of a warning area CK gas leak is displayed instead of a failure display.

The above embodiment is a case in which the present invention is implemented as a repeater, but in an apartment complex or the like, the above repeaters XIL to Xc are configured on a housing information board provided in each dwelling unit, and the block blocks 1 to 3 are used as detectors. K may be provided corresponding to the number of K, and a signal may be transmitted from the K to the housing information board that performs intensive monitoring. Further, instead of the gas leak detector, an intrusion detector or the like which generates the same type of monitoring signal, trouble signal and alarm signal may be connected. The alarm equipment of the present invention is constructed and operates as described above. Therefore, the load on the detection circuit of the receiver provided for each control area is the switching circuit S1 and 52 of the block provided corresponding to one detector even if a large number of Kochigi are connected.
and switching circuit 1 of one other detector block, so the impedance of the signal line does not change and the monitoring signal, trouble signal, and alarm signal are accurately transmitted to the receiver, etc. Gas leakage It would be effective if we could obtain information facilities such as these.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the connection relationship between a repeater, a gas leak detector, and a receiver (-S device) of an alarm equipment according to an embodiment of the present invention, and Fig. 2 is a circuit diagram of the repeater. C... Restricted area, Re... Receiver, 01~G3.
-Gas leak detector, X+Xa-Xa...relay, 1~
3...Block, Sl...First switching circuit, G2...Second switching circuit, R1-R4-one resistor, Q]~Q4...Transistor, DH1D2...
・Diode, zD...Zena diode.

Claims (1)

[Claims] It consists of a pair of switching elements that are connected to the same signal line when detecting a gas leak, etc., and which become conductive when a monitoring signal of a first predetermined voltage is received from the detector and become non-conductive when a trouble signal of zero voltage occurs. a second switching circuit that is turned on by an alarm signal of a second predetermined voltage higher than the first predetermined voltage, and a detector is provided in one switching element of the first switching circuit. The output of the first switching circuit of the other detector on the same line is connected to the other switching element, and the output of the second switching circuit is connected to the signal line. Alarm equipment.