JPS5936892A - Repeater for gas leak alarm equipment - 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] This invention J connects a repeater of order to a pair of signal lines drawn out from a receiver, and detects a gas leak detector provided for each repeater according to the medical condition. Gas leakage and relay output
Concerning repeaters for communication equipment.

In recent years, gas leak alarm equipment for apartment buildings has been developed by connecting a gas leak detector to a receiver via a repeater installed in each housing unit. Since it outputs different voltage signals depending on the detection state, such as 12 volts due to a JS leak and zero volts when the power is cut off, it is received by the repeater using a dedicated signal line corresponding to each detection state. It is conceivable to connect between machines.

However, when connecting lines according to the type of signal, at least four signal lines including the common line are required, which makes the installation work of the signal lines difficult and also increases the cost of equipment. be.

Furthermore, it is desirable to be able to relay and output the detection signal of the gas leak detector using a two-wire method, considering the possibility of sharing the fire alarm system with 1#, which sends signals by turning on and off the contacts. .

The present invention has been made in view of the above, and is a repeater for gas leak alarm equipment in which a plurality of repeaters are connected to a pair of signal lines drawn out from a receiver, and a gas leak detector is connected to each repeater. As a result, when the gas leak signal voltage of the gas leak sensor is detected, the impedance between the pair of signal lines from the receiver is made low, and when the normal signal voltage of the gas leak sensor is detected, one of the pair of signal lines The current monitored by the terminating element during normal operation can be maintained by connecting the conduction output from the previous stage to the other of the pair of signal lines through the terminating element in the final stage repeater. In addition, in the event of a gas leak, the line current due to low line impedance is reduced, and in the event of a failure, the monitoring current is cut off by disconnecting the terminal element, and different relay outputs are transmitted over a pair of signal lines depending on the detection state. The purpose of the present invention is to provide a repeater for bus leakage alarm equipment that can perform the following functions.

Hereinafter, the present invention will be explained based on the drawings.

The figure is a circuit diagram showing one embodiment of the present invention.

First, to explain the configuration, 1 is a receiver;
A pair of signal lines 2 and 8 are drawn out.

Each of 10a, 10b...10n is a repeater provided for each residential unit, and each of gas leak detectors 20a, 20b...20n is connected to the repeater 10a-1On. The sensors 20a to 20n are commercial AC100
V is the power supply, 6 volts during normal operation, 1 volt when gas leak is detected.
It outputs different signal voltages depending on the detection state, such as 2 volts and 0 volts in the event of a failure when the power is cut off.

Next, to explain the configuration of the receiver (1t), the signal line on the signal line 2 side of receiver 1 has a resistor R that detects the line current that flows when the signal lines 2 and 8 are made low impedance.
, , -I+, . . . A current detection circuit consisting of transistors Q4 is provided, and a receiving relay 5 is connected to the collector of the transistor Q4. Further, a continuity test circuit including a continuity test switch 6, an ammeter 7, a resistor it, and a diode D is connected in parallel with the power supply detection circuit including the transistor Q4.

Next, the configurations of the repeaters 108 to 10n will be explained using the repeater 10a as a representative.

First, the output line of the scum leakage sensor 20a is connected to a Zener diode ZD that is conductive at a normal signal voltage of 6 volts.
, a detection circuit with a normal signal voltage of 6 volts, consisting of resistors fL, , fL, and a transistor Q, and a gas leakage signal voltage 1
Zener diode ZD7 conducts at 2 volts, resistor 1 (
, 3, R, and a transistor Q2. Also, the collector of transistor Q, which detects a normal signal voltage of 6 volts, is connected to the base of transistor Q3 via resistor EL, and the emitter of transistor Q is connected to terminal IN, which is connected to signal line 2 from receiver l. is connected, and the collector of the transistor Q3 is drawn out to a terminal OTJ'I'' which is a connection terminal to the next stage repeater.

Further, the collector of the transistor Q, which detects the gas leakage signal voltage 12 volts, is connected to the base of the transistor Q, ry> through the resistor f(, 6), and the collector of the transistor Q, which detects the gas leakage signal voltage 12 volts
When detecting volts, the transistor Q is forcibly turned off.

Transistor Q! By turning on, the impedance between the signal lines 2 and 8 is made low.

This configuration of the repeater 10a is similar to that of the other repeaters 10b to I.
The same applies to on.

Next, to explain the interconnection of the repeaters 10a to 10n, the terminal OUT of the repeater 10a is connected to the terminal IN of the next stage repeater 10b by a signal line 4,
Similarly, for b, the terminal OUT is connected to the terminal INK of the next stage repeater (not shown) via the signal line 4.

Furthermore, the terminal IN of the final stage repeater 10n is connected to the terminal OUT of the previous stage repeater through the signal line 4, and furthermore, the terminal OUT and terminal C of the final stage repeater 10n are connected. A terminating resistor is connected between them.

Next, the action will be explained.

First, it is assumed that all of the gas leak detectors 20a to 20n are in a normal state and are outputting a normal signal voltage of 6 volts.

With this normal signal voltage of 6 volts, I'i' relay 10a
- the zener diode zD in Ion conducts;
Each of the transistors Q, ,Q, is connected to A, and when the transistor Q3 is turned on, the signal line 2 connected from the receiver 1 to the repeater 10a is connected to the next stage by the signal line 4 via the transistor Q of the repeater 10a. The terminating resistor FLo connected to the repeater Ion at the final stage is electrically connected to the repeater 10b, and is further electrically connected to the subsequent repeaters via the transistors Q, and as a result, the terminating resistor FLo connected to the final stage repeater Ion is connected to each repeater. The signal a2, from the receiver 1 to p is transmitted by valving the transistor Q,
It is inserted and connected between 8 and 8.

Therefore, in this normal state, the final stage repeater 10n
terminating resistor connected to. Monitoring room 6 determined by the resistance value of
A current flows between the No. Fi cotton wires 28, and the monitoring current can be checked, for example, by checking the indication on the ammeter 7 when the continuity test switch 6 in the receiver 1 is closed.
It can be confirmed that -1On is relaying and outputting a normal signal voltage.

Next, one of the repeaters, for example, the gas leak sensor 10a of the repeater 10a detects the waste leakage and the waste leakage signal voltage 1 is detected.
Assuming that 2 volts is output, the zener diode ZDt of the repeater 10a becomes conductive, turning on the transistor Q.

When the transistor Q is turned on, the impedance between the signal lines 2 and 8 of the receiver lJl:t) becomes low, and the line current flowing due to the decrease in line impedance is transferred to the resistor R of the receiver 1.
1 degree, transistor Q4 is turned on, and reception relay 5 is activated to issue a gas leak reception alarm.

Furthermore, when the transistor Q2 in the repeater 10a is turned on, the transistor Q3, which is normally on, is turned off and the terminating resistor 11° is disconnected from between the signal lines 2 and 3 in order to cut off the conductive connection to the next stage repeater. It will be in a closed state.

Next, if the power to one of the repeaters, for example the gas leak detector 20b of the repeater 10b, is cut off and a fault signal voltage of 0 volts is generated, the transistors Q and Q3, which are on in the normal state in the repeater 10b, is off 9
To cut off the continuity connection to the primary stage repeater, the terminating resistor Ro connected to the final stage repeater 10n is disconnected from the receiver 1 (FJ line 2.8) and the terminating resistance ratio. The monitoring current no longer flows.

Therefore, when disconnecting the terminating resistor Ro when such a fault is detected, for example, even if the continuity test switch 6 of the receiver l is closed, the ammeter 7 does not indicate the line current; As a result, the repeater can receive that the relay output corresponding to the fault signal voltage is being performed.

In the above embodiment, reception is determined to be normal or faulty by operating the continuity test switch 6, but the termination resistor I
A current detection circuit is provided to detect the current monitored by the current detection circuit, and the detection output of the current detection circuit indicates that the current is in a normal state. As described above, according to the present invention, the reception display of the relay output corresponding to the relay output may be automatically performed. Connect multiple repeaters to a pair of signal lines (
-1 Connect a gas leak detector to each repeater 1 - It is used as a repeater of gas leak alarm equipment, and when the gas leak signal voltage of the gas leak detector is detected, connect the pair of signal lines from the receiver with low impedance. When the normal signal voltage of the gas leak detector is detected, one of the pair of signal lines is connected to the next stage repeater in order, and the last stage repeater connects the continuity output of the previous stage to the pair of signal lines through the termination element. Since the signal line is connected to the other side of the signal line, the connection of the repeater to the pair of signal lines pulled out from the receiver causes the gas leak detector to be detected differently depending on the detection status of normal, gas leak, and failure. A fire detector that can transmit the relay output to the receiver, reduces the number of lines between the receiver and the repeater, reduces equipment construction and equipment costs, and outputs an on/off signal. The effect is that the signal line in the fire alarm equipment connected to the trench can be used as the signal line for the trenched gas leak alarm equipment.

1...Receiver 2,8.4...Signal line 5...
Receiving relay 6...Continuity test switch 7...Ammeter 10a, 10b, 10n...Relayer 20a, 20b, 20n -...Cass leakage sensor Q,~Q3...Transistor ZD, , ZD! ...Zena diode Ro...
Terminal resistor patent applicant Houteki Co., Ltd. Agent Patent attorney Susumu Takeuchi

Claims (1)

[Claims] A gas leak signal voltage of a gas leak detector is detected in a repeater of a gas leak alarm equipment in which a gas leak detector is connected to a pair of signal lines drawn out from a receiver via a repeater. A gas leak signal detection circuit that lowers the impedance between the pair of signal lines from the receiver, and detects a normal signal voltage of the gas leak sensor and connects one of the pair of signal lines to the next stage repeater. A gas gas characterized by comprising: a normal signal detection circuit that is electrically connected; and a termination circuit that is connected to the other of the pair of signal lines via an output termination element of the normal signal detection circuit in a final stage repeater. Repeater for leak alarm equipment.