JPH021666Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a signal repeater for a gas leak warning system. In particular, the present invention relates to a signal repeater for a system in which the signal from a gas leak alarm to a central monitoring panel is a non-voltage contact signal.

In a gas leak alarm system consisting of multiple gas leak alarms and a central monitoring panel, if multiple gas leak alarms are used in one room,
Alternatively, if a large number of gas leak alarms are required, such as in a large housing complex, an enormous amount of wiring will be required from each gas leak alarm to the central monitoring panel.
In such cases, you can reduce the number of wires by installing a repeater in each room or on each floor, processing the output signals of the multiple gas leak alarms into a batch signal, and then sending it to the central monitoring panel. can be significantly reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a repeater that processes a plurality of signals into a batch signal.

Among these, the present invention is aimed at a signal repeater that is applied to a gas leak alarm system using a non-voltage contact signal method.Before explaining the repeater according to the present invention, we will briefly explain the non-voltage contact signal method. do. This method has three signal forms as external output signals of the gas leak alarm. One is a contact close signal when the gas leak alarm is monitoring, the second is a contact open signal when the gas leak alarm is cut off, has a failure, or has a disconnection of the signal line, and the rest are gas leak signals. This is the contact opening/closing signal when the alarm detects a gas leak and issues an alarm. The repeater according to the present invention receives several sets of these three types of signals, processes them, and outputs the same types of signals as a batch signal.

Hereinafter, preferred embodiments of the present invention will be described in detail as illustrated in the accompanying drawings.

The drawing shows a signal discrimination circuit A and an output signal circuit B.
is shown. The same number of signal discrimination circuits A are required as the number of gas leak alarms to be relayed, but since the circuits are the same, only one of them is shown.

In the signal discrimination circuit A, terminals 1 and 2 are power supply terminals that receive the same power as the power supply to the associated gas leak alarm, and terminals 3 and 4 are input terminals that receive the contact signal of the associated gas leak alarm. Equivalently, an alarm output relay contact is connected between the terminals. Therefore, if a contact closing signal is input during monitoring, input terminals 3 and 4
It is equivalent to a short circuit between the two terminals, and the contact opens when a fault occurs.

The signal discrimination circuit A includes a transistor 5 that receives a contact signal which is an output signal of the related gas leak alarm.
and alarm signal (contact opening/closing signal) at the time of gas leak alarm.
A capacitor 6 for passing through the battery, a capacitor 7 connected in parallel with a high discharge resistor to maintain a charged state while an alarm signal is input, and comparators 8 and 9, each of which has an output terminal 10. , 11 is the output signal circuit B
It is connected to the input of the gas leak warning lamp 12 and the transistors 15 that drive the gas leak warning lamp 12 and the failure indicator lamp 14, respectively.

The output signal circuit B includes the same number of diodes 16 or 18 and transistors 17 as the number of signal discrimination circuits A.
or 19, and a relay 20 driven by transistors 17 and 19.
, an astable multivibrator 21 and a relay 22 that generate a contact opening/closing signal of a collective signal, and a transistor 23 that controls the operation of the astable multivibrator 21. Output terminals 24 and 25 of output signal circuit B, which are also output terminals of the repeater
Contacts 20' and 22' of relays 20 and 22 are connected in series.

During gas leak monitoring, the signal discrimination circuit A receives a contact close signal from the gas leak alarm. Therefore, transistor 5 is in an ON state. In the comparator 8, since the signal from the transistor 5 is blocked by the capacitor 6, no signal is transmitted to its (+) input, so the (-) input has a higher level than the (+) input. Since the voltage is applied, the output becomes a low level state. On the other hand, since the comparator 9 receives a signal from the transistor 5 at its (+) input, its output is at a high level. Therefore, the signal discrimination circuit A outputs a low level signal to its output terminal 10 and a high level signal to its terminal 11 during gas leak monitoring.

These signals at output terminals 10 and 11 turn off transistors 13 and 15, respectively, so that gas leak warning lamp 12 and failure indicator lamp 14 do not light up.

In the output signal circuit B, the diode 16 is in a cutoff state because it is receiving a low level signal.
Therefore, transistor 17 is also OFF. In addition, the diode 18 is also in a cutoff state because it is receiving a high level signal, so the transistor 1
9 is turned ON because power is supplied to the base via the resistor and the Zener diode. As a result,
Relay 20 is energized and its contacts 20' are closed.

Since the transistor 17 is in the OFF state, the diodes 26 and 27 are also in the OFF state, so the transistor 23 is in the ON state. In this case the astable multivibrator is reset and its output is held low. Relay 22 is therefore energized and its contacts 22' are closed.

Therefore, the output signal circuit B outputs a contact closing signal as its output signal. This becomes the repeater output signal when monitoring gas leaks.

Next, the operation at the time of gas leak alarm will be explained. At this time, the signal discrimination circuit A receives a contact opening/closing signal that periodically opens and closes from the gas leak alarm. Therefore, the transistor 5 alternately repeats the ON state and the OFF state. Charge is gradually accumulated in the capacitor 7, and when the terminal voltage thereof exceeds the reference voltage of the (-) input of the comparator 8, the comparator 8 outputs a high level signal.

Since the capacitor connected to the (+) input of the comparator 9 is sufficiently charged during gas leak monitoring, the input/output status of the comparator 9 remains unchanged even if the power supply from the transistor 5 is cut off for a short time. does not change. That is, the comparator 9 outputs a high level signal.

Therefore, since the output terminals 10 and 11 of the signal discrimination circuit A are both high-level signals, the transistor 13 is turned on and the gas leak warning lamp 12 is lit, and the transistor 15 is turned off and the failure indicator lamp 14 is turned off. It remains as it is.

In output signal circuit B, transistor 19 is ON
Although there is no change in the state in which the relay 20 is excited, the transistor 17 is now turned on, the transistor 23 is turned off, and the astable multivibrator 21 oscillates at, for example, 1 to 2 Hz. Therefore the relay 22 connected to its output
is also intermittently excited, and its contact 22' periodically opens and closes.

For this reason, the repeater is connected to terminal 2 when a gas leak alarm occurs.
A contact opening/closing signal is output to terminals 4 and 25.

Finally, a case will be described in which the signal discrimination circuit A receives a contact open signal or a signal equivalent thereto due to a failure of the gas leak alarm, a power outage, or a break in the signal line to the repeater.

In signal discrimination circuit A, transistor 5 is OFF
state. Therefore, the signal from the transistor 5 disappears, but since the comparator 8 is DC-blocked by the capacitor 6, a low level signal is output to the terminal 10 as in the case of gas leak monitoring. On the other hand, in the comparator 9, since power is no longer supplied from the transistor 5 to its (+) input, the electric charge of the capacitor connected to the (+) input is gradually discharged, and after a predetermined time, a low level is applied to the terminal 11. It will give a signal.

As a result, the gas leak warning lamp 12 remains off, but the failure indicator lamp 14 is turned on as the transistor 15 turns on.

In output signal circuit B, transistors 17 and 19
is OFF, transistor 23 is ON, and relay 20
is demagnetized, and relay 22 is energized. As a result, the contacts 20' are open and the contacts 22' are closed, so that the output terminals 24, 25 output a contact open signal indicating a failure.

In addition, in output signal circuit B, its input is
Since it has a NOR configuration, if there is a gas leak alarm or a failure in any one of the signal discrimination circuits A, the repeater outputs the corresponding contact open/close signal or contact open signal as a collective signal.

Furthermore, if a gas leak alarm and a failure occur simultaneously in different signal discrimination circuits A, the gas leak alarm is transmitted with priority. For this purpose, in output signal circuit B, diode 2
7, and when a gas leak alarm occurs, the transistor 17 energizes the relay 20, which is demagnetized in the event of a failure, through its diode 27 to close the contact 20'.

As described above, according to the present invention, in a gas alarm system using a gas leak alarm that outputs contact close, contact open/close, and contact open signals as output signals, the output signals of a plurality of gas leak alarms are It is possible to process all signals at once, convert them into a single signal, and send this to a central monitoring board, which allows for significant savings in signal lines and wiring.

[Brief explanation of drawings]

The drawing is a wiring diagram showing a preferred embodiment of the signal repeater according to the present invention. A...Signal discrimination circuit, B...Output signal circuit,
8, 9... Comparator, 12... Gas leak warning lamp, 14... Failure indicator lamp, 20, 22... Buzzer, 21... Unstable multivibrator.

Claims (1)

[Scope of utility model registration request] Includes multiple gas leak alarms that output three types of signals to be transmitted to the central monitoring panel: a contact close signal for gas leak monitoring, a contact open/close signal for gas leak alarm, and a contact open signal for failure. This system is applied to a gas leak alarm system, and includes a plurality of signal discrimination circuits that are connected to each gas leak alarm and discriminates the three types of signals, and a plurality of signal discrimination circuits that are connected to each gas leak alarm and discriminate the three types of signals. and one output signal circuit that receives each discriminated output signal and converts it into a collective signal of the same type as the three types of signals, and the signal discrimination circuit receives the input of the contact close signal and the contact open/close signal. A first comparison that outputs a first level signal when receiving a contact close signal and a contact open/close signal via a capacitor that maintains the state, and outputs a second level signal when receiving the contact open signal. and a second comparator that outputs a first level signal only when receiving a contact opening/closing signal via a capacitor for passing the contact opening/closing signal and a capacitor for holding the passed signal, The output signal circuit includes first and second relays in which each relay contact is connected in series to form the collective signal, a multivibrator that drives the second relay with intermittent excitation, and each input connected to the first relay. a first OR circuit connected to each output of the comparator; a transistor that drives the first relay when the first OR circuit receives only a first level signal;
a second OR circuit, each input of which is connected to the output of the two comparators, and when one or more inputs of the second OR circuit receive a first level signal, the first relay; and a transistor for driving the multivibrator.