JPS5844468Y2 - fire alarm - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a fire alarm in which the detector side cannot be reset by operating only the receiver side, and in which a plurality of detectors can be connected.

A fire alarm system in which, when a detector fires an alarm, it is not possible to restore the detector or the alarm indicator light and other circuits on the detector side only by operation on the receiver side is disclosed in Japanese Patent Application Laid-open No. 1973- 8
Including Publication No. 899, Utility Model Application Publication No. 50-126190. Various types are known, as shown in Japanese Patent No. 50-136380 and Japanese Patent No. 50-136387.

However, in all of these conventional systems, the circuit cannot be restored unless the power supply voltage is directly applied to the self-holding relay to restore the self-holding relay by operating the restoration switch on the sensor side, and therefore the circuit cannot be restored. If there are multiple alarm detectors on the line, it may become impossible to secure the voltage necessary to restore the relay, making it virtually impossible to restore the circuit.

Furthermore, in these conventional systems, the alarm indicator light is lit by the contacts of the relay, so if the relay is out of order, the indicator light will not be lit even if the sensor issues an alarm.

This invention was made to eliminate these conventional drawbacks.In a fire alarm system in which the circuit cannot be restored only by operation on the receiver side, the indicator lamp lights up immediately when the detector is activated, and this can be done using a relay contact. When a fire alarm is triggered by a fire detector, the alarm indicator light can be turned on even if the relay is out of order, and even if other detectors are triggered, It is an object of the present invention to provide a fire alarm system in which a holding relay can be restored to prevent a situation in which the circuit cannot be restored.

In other words, in the fire alarm system of this invention, when the sensor is activated and the circuit is activated, the recovery operation cannot be performed only on the receiver side, so that the recovery operation must be performed on the sensor side. In a device that requires a two-winding self-holding relay disposed on the sensor side, one end of one winding of the relay is connected to the positive terminal side of the power supply together with one end of the sensor via a capacitor, and the one winding of the relay The other end is connected to one fixed contact of the switching contacts of the relay through a diode of opposite polarity to the power source, and contacts the one fixed contact of the relay until the one winding is energized. Once the wire is energized, until the other winding is energized, the movable contact of the switching contact, which contacts the other fixed contact connected to the positive side of the power source, is connected to the other end of the sensor as shown above. The other winding is connected to both ends of the capacitor via a normally open switch for recovery so as to constitute a discharge circuit for the capacitor.
The connection point between the capacitor and the one winding is connected to the negative pole side of the power source together with the indicator light via a high resistance.

As mentioned above, the alarm indicator light is connected in series to the sensor, so the alarm indicator light will light up immediately when the sensor is activated.
Thereafter, the alarm indicator light is kept energized by contact between the other fixed contact and the movable contact of the relay.

Furthermore, since the relay is reset by discharging the charge in the capacitor, it is independent of the power supply and is not limited by alarms from other sensors.

To explain this invention in detail together with the drawings, the drawing is a circuit diagram showing one embodiment of the invention, 1 is a receiver, and a pair of lines 2 and 2' are drawn out from the receiver and connected therebetween. A transmitting unit 3 on the monitoring end side is connected to.

Inside the receiver 1, a DC power supply 4, a main switch 5, and a current detection relay 6 for alarm detection are connected in series, while on the sensor side, the relay is closed when a temperature sensor, smoke detector, etc. is activated. The sensor I, the current limiting resistor 8, and the alarm indicator light 9 are connected in series, and these constitute a series closed circuit via the line 2.2'.

In the receiver 1, 5a and 5b are normally open contacts of a current detection relay 6, and the contact 6a is for self-holding of the relay 6;
b is a contact point for making the buzzer 10 sound when the relay 6 is activated.

A two-winding self-holding relay 11 is provided on the sensor side, and the relay 11 consists of one winding 11a, the other winding 11b, and a switching contact 12.

The switching contact 12 includes one movable contact 12a and the movable contact 12
Two fixed contacts 12b, 12c that a contacts with either
It consists of.

The movable contact 12a comes into contact with the fixed contact 12c when the winding 11a is excited, and thereafter remains in contact with the fixed contact 12cK until the other winding 11b is excited.

Further, the movable contact 12a contacts the fixed contact 12b when the winding 11b is excited, and is held in contact with the fixed contact 12bK until the winding 11a is thereafter excited.

One end of the winding 11a is connected to the line 2 together with one end of the sensor I via a large capacity capacitor 13, and is connected to the positive terminal of the power source 4 via the current detection relay 6 and the main switch 5.

The other end of the winding 11a is connected to the fixed contact 12b via a diode 14 of opposite polarity to the power source 4, and the movable contact 12a is connected to the connection point between the sensor 7 and the current limiting resistor 8. Power source 4 via the resistor 8 and alarm indicator light 9
leads to the negative electrode.

A resistor 15 connected in parallel to the alarm indicator light 9 is used to prevent the operating current of the sensor 7 from stopping flowing when the indicator light is disconnected.

Another fixed contact 12c of the switching contacts 12 is connected to the line 2 and then to the positive pole of the power source 4 via the relay 6 and the main switch 5.

There is a high resistance 1 from the connection point between the capacitor 13 and the winding 11a.
6 is connected to the negative terminal of the power supply 4 via the line 2, thereby forming a series charging circuit of the capacitor 13 and the high resistance 16.
The sensor 7 is connected in parallel to a series circuit of a resistor 8 and an alarm indicator light 9.

Another winding 11b of the self-holding relay 11 is connected to both ends of the capacitor 130 via a normally open recovery switch 17 such as a self-resetting pushbutton switch.
It is designed to be excited by the discharge current of No. 3.

In the fire alarm of this invention having the above-described circuit configuration, when the detector 7 is not generating an alarm, the monitoring voltage of the power supply 4 is applied across the detector 70, and the current detection relay 6
A charging current flows to the capacitor 13 via the high resistance 16, and the capacitor 13 is charged to almost the power supply voltage.

This charging current is limited by the high resistance 16 to a small current value that does not cause the current detection relay 6 to operate, thereby reducing current consumption during normal monitoring.

When the sensor 7 generates an alarm and closes, an operating current flows through the current detection relay 6, the sensor 7, the resistor 8, and the alarm indicator light 9, which immediately lights up the alarm indicator 9 and closes the current detection relay. 6 is activated and the relay contacts 6a and 6b are closed, or the current detection relay 6 is self-held by the closing of the contact 6a, and the buzzer 10 sounds by the closing of the contact 6b and receives the alarm from the sensor 70. We will inform you on machine 1.

Also, when the sensor 7 is activated, the sensor 7 and the movable contact 12a
A discharge circuit of the capacitor 13 is formed via the fixed contact 12b, the diode 14, and one winding 11a of the self-holding relay 11.The movable contact 1
2a is separated from the fixed contact 12b and comes into contact with the fixed contact 12c.

As a result, the discharge of the capacitor 13 is stopped and the sensor 7 is also damaged, and even if the sensor 7 is restored after that, the power to the alarm indicator lamp 9 is maintained and the indicator lamp 9 continues to light up. The receiver side also maintains the same state as the alerting state.

For example, even if the main switch 5 of the receiver 1 is operated to cut off the power supply, the current detection relay 6 will return to normal state and the buzzer will be activated only while the main switch 5 is open. 10 stops ringing and the alarm indicator light 90 also goes out, but when the main switch 5 is removed and the power is turned on again, the switching contact 12 of the self-holding relay 11 switches to its movable contact 1.
2a is kept in contact with the fixed contact 12c, the operating current flows again and the alarm indicator light 9 lights up, the current detection V-6 also operates again and the buzzer 10 sounds again. However, in the end, the circuit cannot be restored.

When the alarm is notified by the sound of the buzzer 10,
A circuit recovery switch 17 is provided on the sensor side so that the circuit cannot be recovered without going to the scene where the alarm occurred. By operating this recovery switch 17 and temporarily closing it, the self-holding relay 11 is closed. The discharge current of the other winding 11bK capacitor 13 flows as an exciting current.

The capacitor 13 has a resistor 16 even when the sensor 7 is alarming or even when the movable contact 12a is in contact with the fixed contact 12c.
Since a voltage is applied through the coil and the voltage is still being charged to that voltage, even if a large amount of charging charge is used to excite one of the windings 11a, the charging potential will be reduced until the recovery switch 17 is operated. He is recovering.

For this reason, the above-mentioned resistor 16 ensures that the Q signal is generated when another sensor is connected in parallel, and also ensures that the self-holding relay 1 is activated even if the other sensor generates the signal.
1 can be reset by excitation of its winding 1 lb.

When the winding 11b is excited, the movable contact 12a becomes the fixed contact 1.
2 and comes into contact with the fixed contact 12b. Therefore, if the sensor 7 has already recovered due to a temporary false alarm, the circuit on the sensor side will recover without forming a discharge circuit for the capacitor 13. do.

Thereafter, by temporarily opening the main switch 5 in the receiver 1, the current detection relay 6 is also restored, and the entire circuit is thereby restored to the monitoring state.

It is also possible to provide all the circuits other than the recovery switch 17 and the sensor including the alarm indicator light outdoors, and it is also possible to provide only the recovery switch 17 outdoors.

As mentioned above, in this design, the self-maintenance of the sensor side is achieved in a fire alarm system that ensures that the circuit cannot be restored without manual operation on the sensor side when the sensor fires. Even if the relay fails, the alarm display function due to fire is ensured, and the alarm indicator lamp lights up directly when the sensor alarms, and even when an alarm is occurring, it does not prevent other parallel detectors on the same line from issuing alarms. In addition, various practical effects can be achieved, such as the self-holding relay can be reliably reset even when the other sensors mentioned above are alarming, regardless of the power supply.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of this invention. 1: Receiver, 2.2': Line, 3: Transmitter, 4: DC power supply, 5: Main switch, 6: Current detection relay 7: Sensor,
8: Resistor, 9: Alarm indicator, 10: Buzzer 11: 2-winding self-holding relay 11a. 11b: Winding wire, 12: Switching contact, 12a: Movable contact, 1
2b, 12c: Fixed contact, 13: Condenser: Su, 14:
Diode, 16: High resistance, 17: Recovery switch.

Claims (1)

[Scope of utility model registration request] A series circuit of a sensor and an alarm indicator connected in series to the receiving current detection means, a charging circuit of a capacitor and a high resistance connected in parallel to the series circuit, and a charging circuit of a capacitor and a high resistance connected in parallel to the series circuit; Two windings comprising a first winding that is excited by the discharge current of the capacitor and a second winding that is excited by the discharge current of the capacitor when a recovery switch provided on the sensor side is operated. A self-holding relay, until the first winding is energized, the first winding, the capacitor, and the sensor form a closed circuit, and when the first winding is energized, the second winding then closes. A switching contact of the relay that bypasses the sensor and maintains energization to the indicator light until the wire is energized.