JPS5913077B2 - Fire alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system for detecting fires, etc., which makes it possible to individually identify the detectors for fires, etc. that have been detected, and to inspect abnormalities in the lines to which the individual detectors are connected on the receiving side. This relates to a notification system.

Conventional methods for identifying detectors include equipping two common lines with filters each having a unique frequency, and installing an oscillator on the receiving side that covers the filter frequencies of all detectors. There is a method (Japanese Patent Publication No. 45-26844) in which the receiving side identifies when a detector issues an alarm.

However, the filters attached to each detector are complicated and the oscillator must be installed on the receiving side, which poses difficulties in terms of equipment and security.

Another method is to insert a Zener diode with a control voltage value unique to each detector between the two lines in series with the sensitive contact of each detector, detect the operating voltage, and distinguish between these. There is a system (Japanese Patent Publication No. 43-1963), but it has the drawback that when a plurality of detectors emit alarms at the same time, it is not possible to separate and identify the alarming detectors.

Therefore, there is a risk that appropriate measures such as evacuation guidance may be delayed due to the troublesome task of confirming the fire scene.

The present invention eliminates these drawbacks, simplifies equipment, inspection, and maintenance, and even when multiple detectors operate at the same time, each can be separated and identified, making it possible to quickly confirm the fire scene and take subsequent measures. It provides a detection system for fires, etc.

Hereinafter, one embodiment of the present invention will be described in detail.

The drawing shows an example in which the number of detectors is n=3.

R indicates the receiving side, E indicates a power supply during normal operation, SWl indicates a switch that can be connected to each detection line 21 and 12 separately, Pl,
R2°R3, R4 are relay drive coils connected to each detection line, C1, C2, and the operating current value of each relay drive coil is set to the following relationship.

A is an ammeter. R2 is a variable power supply that can vary the output voltage, and SW2 is each detection line t1. This is a switch that can be connected independently to t2.

Pl, R2, R3, R4 are relay drive coils P1°R2
, R3, and R4, which are connected in parallel.

Ds is a display device, R5 is a relay drive coil of an alarm relay, R5 is an alarm circuit switch operated by drive coil P5, and SP is an alarm device.

So, N2. N3 is each detector, tl, t2 are detection lines,
t3 is a common line, t1 to t5 are connection points with each detector, a
l, a2. a3 is the sensitive switch of each detector, Dl, R2
, R3 are Zener diodes with different control voltage values, Ql,
Q2゜Q3 is a Zener diode D1. D2. A sensitive switch a1. connected in series to D3. a2. Relay drive coils, ql, q2. connected in parallel with a3. q3.

q3'' is a relay contact operated by relay drive coils Qt, Q2.Qa, Ml, M2. , each relay contact q1
．． q2. It is connected in series to q3' and q3''.

R1, R2, R3, and R4 are resistors connected in series with the sensitive switch of each detector, and their magnitude is Ra''= R4
>> Set so that Rt = R2.

N1 is relay drive coil 1. nl is its relay contact.

Next, the operation of this fire alarm system will be explained.

Now, when a fire is detected in the sensor of the detector S1 and the sensitive switch a1 becomes conductive, the detection line t2 and the common line t3
A current flows through the switch SW1 and its value is determined by the resistor R1.

If this current is IR, it is set as IR4<IR4, so relay drive coil P3. P4 operates, and its relay contact p3. p4 conducts.

This lights up the lamp etc. corresponding to the detector S1 on the display device Ds, at the same time the relay drive coil P5 operates, and the alarm circuit switch p becomes conductive to issue an alarm.

When the detector S2 issues an alarm, the entire operation is complete (the relay drive coils P□, P2 operate as in the case of the detector S1, and the relay contact pI t l) 2 becomes conductive.

When the detector S3 generates an alarm, the sensitive switch a3 becomes conductive, and the relay contact n1 becomes conductive due to the relay 1 drive coil N1, and the resistances R3 and R4 are connected to the detection line t1, the common line t3, and the detection line t2, respectively. A current flows that determines

Now, ■R12IR2〉■P2-IP4) IR3-IR4
〉■P1=IP, so relay drive coil P1. P3 operates and its relay contact pI p Pa
conducts.

As a result, the lamp corresponding to 83 lights up on the display device Ds, and at the same time, the alarm circuit switch p5 becomes conductive and issues an alarm.

Next, a case where a plurality of detectors operate will be described.

(a) Detector S1. When N3 operates at the same time, sensitive switches a1. a3 is conductive, and the detection line t2 has resistors R1,
A current whose magnitude is determined by R3 flows, and the detection line t,
A current whose magnitude is determined by resistor R4 flows through.

Therefore, relay drive coil P7. P3. P4 operates, and relay contact p1. p3°R4 becomes conductive, indicating on the display Ds that detectors S1 and N3 are activated.

(b) Detector S2. When N3 operates at the same time, sensitive switches a2. a3 becomes conductive, a current whose magnitude is determined by the resistor R3 flows through the detection line t2, a current whose magnitude is determined by the resistors R2 and R4 flows through the detection line t1, and the relay drive coils P1. P2. P3 operates and its relay contact p
1. p2. p3 becomes conductive, and the detector S2.p3 becomes conductive on the display device Ds. Notify that S has operated.

(c) Detector S1. When N2 operates simultaneously, sensitive switches a1. a2 is conductive, and the detection line t0 has a resistor R2.
, currents whose magnitudes are determined by resistors R2 flow through the detection lines P1, t2, and relay drive coils P1. P2. P3
．． P4 operates and its relay contact p1t p2 t p
3 t p4 conducts and on the display device Ds, Sl,
Notify that S2 has operated.

) Sl, S2. S3 operates at the same time, sensitive switch a
1. a2. When all a3 become conductive, relay drive coil P1. P2. P3. P4 operates and relay contact p
1. p2. p3. p4 becomes conductive, and on the display device Ds, the detectors S1. It only informs that S2 has operated.

This is the detector S1. Simultaneous operation of S2 and detector S1. S
2. The distinction between the operations of S3 is that the current flowing during each operating state is connected to the detector S1. S2 operation two ■R1+■R2〈Sl, S2
゜S3 operation: Since there is a difference in magnitude between ■R1+IR2+■R3+■R4, this can be achieved by monitoring the ammeter A.

Table 1 shows the number of motion detectors and the operating status of the relays.

Therefore, when there are three lines, each detector that can be connected to the line can be identified one by one no matter how the alarm is issued.

The case where there are three lines and three detectors has been described above, but in the case of the present invention, this connection is a basic connection, and the case where the number of lines is three or more can be considered to be completely equivalent.

Table 2 shows the number of lines and the maximum number of connectable detectors.

When the fire alarm system according to the present invention is used, regardless of the number of lines, if a signal arrives on one or two lines at the same time excluding the common line, the detector that issued the signal will It is also possible to identify all lines and all detectors individually.

Next, we will describe the operation when each detector is remotely inspected individually in this detection system.

All detectors S1. S2. When S3 is in the OFF state, SW2 is connected to the line to be inspected, for example t2, among the detection lines t, , i2 in the drawing, and the applied voltage value of the variable power source E2 is made equal to the voltage of the power source E1.

Next, SWl connecting El and t2 is disconnected.

The value of E2 is gradually increased from El.

The control voltage of the Zener diode inside the detector is Dle<D
If 2e<D3e, Dl becomes conductive at E2>Dle, current flows through relay drive coil Q1, relay contact q1 becomes conductive, and is held by holding coil M1.

The condition of the line up to relay contact q1 can be inspected simply by making relay contact q1 conductive, but this operation can also be used to, for example, adjust the ionic current balance of a smoke detector (by operating the 81 Create a state equivalent to that at the time of a fire outbreak.

In this state, it is checked whether 81 operates or not, but if Dl and ql remain conductive, this state is already equivalent to an alarm, so it is impossible to identify the alarm by the sensitive switch a1.

Therefore, after a certain period of time has elapsed, the voltage E2 is lowered to cut off the relay contact q1 again, and the signal from only the sensitive switch a1 is detected.

In the case of this inspection, as can be seen from the drawing, it is possible to inspect each of the detectors connected to the line by inspecting one line.

As explained above, according to the present invention, the position of the detector can be identified on the receiving side when the detector fires an alarm, and furthermore, the position of the detector can be identified even when a plurality of detectors fire the alarm at the same time.

Therefore, confirming whether or not it is a non-fire alarm after the detector has triggered an alarm,
This has the effect that processes such as evacuation guidance can be performed accurately and quickly.

Further, since each detection line and the common line can be inspected from a separate location such as a disaster prevention center, maintenance can be easily performed and the cost can be reduced.

[Brief explanation of drawings]

The drawing is a block diagram of a fire alarm system in one embodiment of the present invention. Sl, S2. S3...detector, al, a2. a3...
・Sensitive switch, tl, t2...detection line, t3...
・Common line, Pl, P2. P3. P4. P5. Ql,Q
2. Q3゜N, -°° relay drive coil, Pt, P2
t p3t p4 ynl...Relay contact, p5・
・・Alarm circuit switch, Ch t (12t q3'
, qa"" relay contact, D s ... display device, sp
...Alarm device.

Claims (1)

[Claims] 11 common lines and (n-1) detection lines (n≧3), each having one end connected to the common line, and each having a different other end via a resistor. A plurality of sensitive switches that operate in the event of a fire, etc. connected to the detection line; and at least one switch that operates in the event of a fire, etc., one end of which is connected to the common line and the other end connected to the two detection lines via a resistor. a plurality of relay drive coils with different operating current values connected to each of the detection lines, a plurality of relay contacts driven by each of the relay drive coils, and closing of the plurality of relay contacts. a display device that displays an operation-sensitive switch according to the operation, and a power supply that supplies a current between each of the detection lines and a common line, the current value flowing through the resistor when the one or more sensitive switches is operated. An alarm system for fire, etc., characterized in that a predetermined relay contact among the plurality of relay contacts is closed in accordance with the above. A fire with 21 common lines and (n-1) detection lines (n≧3), one end of each connected to the common line and the other end connected to a different detection line via a resistor. a plurality of sensitive switches that operate in the event of a fire, etc.; and at least one sensitive switch that operates in the event of a fire, etc., one end of which is connected to the common line and the other end of which is connected to the two detection lines via a resistor; A first series circuit consisting of a Zener diode and a relay coil with different voltage values and connected in parallel to each of the sensitive switches, a relay contact driven by the relay coil, and a holding circuit for keeping the relay contact closed. a second series circuit consisting of a coil and connected in parallel to each of the sensitive switches, and a variable power supply that supplies a voltage between each of the detection lines and a common line, the output voltage of the variable power supply being varied. A fire alarm system characterized by closing a predetermined relay contact.