JPH035989Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a storage type repeater for a fire alarm system.

[Background technology]

FIG. 4 shows a block diagram of a storage type repeater for a conventional fire alarm system, and in the figure, X is the main body of the storage type repeater. Reference numeral 6 denotes a constant voltage circuit section, and this constant voltage circuit section 6 is connected between the existing power output terminal _I0 , which is provided for supplying DC power from the receiver A to the sub-receiver, etc., and the common connection terminal C. This stabilizes the DC output to a DC output of a predetermined voltage and supplies it as a power source to each circuit described below. 2 is a line voltage detection circuit section, and this line voltage detection circuit section 2 is connected between the common line LC connected to the common connection terminal C and the sensor connection line LC connected to the sensor connection line connection terminal L. When the voltage is constantly monitored and the smoke detector 1a, the heat sensor 1b, or the transmitter 3 operates and detects that the voltage has fallen below a certain voltage, a detection output is generated. Reference numeral 4 denotes a switching circuit section that turns on when a detection output is input to drive the high-sensitivity relay 5. The high-sensitivity relay 5 is a high-sensitivity type that operates faster than the time it takes for the reception relay Ry of the receiver A to operate, and when the reception relay Ry is excited, its self-holding circuit is activated. Receive relay Ry
The relay contact r ₀ can be reversed from a normally closed contact b to a normally open contact a before forming the relay contact. Relay contact _r0 is inserted in series at the starting end of the common line lc that connects the normally closed contact b side to the common line connecting terminal C, and when the normally closed contact b is opened, the common line lc and the common line connecting terminal Cut off between C,
The power supply from the receiver A to the smoke detector 1a connected between the common line LC and the sensor connection line _L1 is stopped, and the excitation circuit of the receiving relay Ry in the receiver A is cut off. ing. 7 is a first timer circuit section, and when the line voltage detection circuit section 2 generates the first detection output and the switching circuit section 4 starts the ON operation, the first timer circuit section 7 starts the time-limited operation from this start time. When a predetermined period of time has elapsed, a time-up output is output to the second timer circuit section 8, and the time limit operation time of the first timer circuit section 7 is set to 10 to 20 seconds. The second timer circuit section 8 starts a time-limited operation when the first timer circuit section 7 times up, and forcibly sets the operation of the switching circuit section 4 to an OFF state during the operation period. Therefore, the constant voltage circuit section 1, the line voltage detection circuit section 2,
Switching circuit section 4 and first timer circuit section 7
, the second timer circuit section 8, and the high-sensitivity relay 5 constitute a storage type repeater main body X having a function of preventing temporary malfunction of the sensor attached to the existing receiver A. It is something. In such a conventional example, an additional terminal for connecting to a plurality of sensor connection lines _l1 is provided in the line voltage detection circuit section 2 of the repeater main body X. However, there is a limit to the number of sensor connection lines l ₁ (connection lines) that can be connected to the repeater main body for multiple lines, and it is conceivable that a plurality of sensor connection lines l 1 (connection lines) must be used. In that case, it is necessary to consider, for example, one common line LC for each seven warning zones.

[Purpose of invention]

The present invention has been proposed in view of the above points, and it is possible to increase the number of lines by connecting an additional terminal block equipped with a diode OR to the additional terminal provided in the line voltage detection circuit section of the main body of the repeater. The present invention provides a storage type repeater for a fire alarm system that aims to increase the number of fire alarms.

[Disclosure of invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The basic block diagram is the same as the conventional one shown in FIG. 4, and FIG. 1 shows a specific circuit diagram. In FIG. 1, if we are currently in a normal state, the voltage between each sensor connection line l ₁ ... and the common line lc is the voltage output from receiver A via reception relay Ry.
Since no base current flows through the base of the transistor Q ₁ of the line voltage detection circuit section 2 via the diode D ₁ , the transistor Q ₁ is in an off state.
Here, the diodes _D1 ... have their anodes commonly connected to the base of the transistor _Q1 , and their cathodes individually connected to the corresponding sensor connection lines _l1 .... Now, in the second timer circuit section 8, since the input of inverter IN ₁ is "L", inverter IN ₂ whose "H" output is connected to the input terminal generates "L" output, and The output is connected to the input terminal of the NOR gate NOR ₁ of the first timer circuit section 7. Furthermore, since the input of the inverter _IN3 is at the "H" level, the output is "L" and is connected to the other input terminal of the NOR gate _NOR1 . The NOR gate NOR ₁ of the first timer circuit section 7 further connects the other input terminal to another NOR gate.
Connected to NOR ₂ . Since the NOR gate NOR ₂ receives an "H" input when the transistor Q ₂ of the switching circuit section 4 is off, the output is "L". Therefore, the NOR gate NOR ₁ outputs "H" and is connected to the output terminal. This prevents capacitor C of the CR time constant circuit from charging.

Now, for example, when the smoke detector 1a connected to the sensor connection line _l1 detects smoke and turns on, a connection between the sensor connection line _l1 and the common line lc is created via the impedance of the smoke detector 1a. As a result, the voltage between both wires l ₁ and lc drops. Due to this drop, a base current immediately flows to the base of the transistor Q ₁ of the line voltage detection circuit section 2 via the diode D ₁ , turning on the transistor Q ₁ . As a result of this turning on, a charging current flows through the transistor _Q1 to the capacitor _C2 , and the capacitor _C2 is charged. Therefore, the voltage across the capacitor _C2 increases, causing a base current to flow through the base of the transistor _Q2 of the switching circuit section 4. Transistor Q ₂ is turned on when a base current flows therethrough, and drives high-sensitivity relay 5 which is connected between the output terminals of constant voltage circuit section 6 via transistor Q ₂ . The high-sensitivity relay 5 turns off the normally closed contact b of the relay contact r ₀ and opens the common line lc.

By this opening, the receiving relay Ry in the receiver A,
The energizing path for the excitation current of the reception relay Ry, which is formed by the sensor connection line l ₁ , the sensor, and the common line lc, is cut off. In other words, if the high-sensitivity relay 5 operates earlier (for example, 1 msec) than the time required for the operation of the receiving relay Ry (for example, 10 msec),
Receiving relay Ry does not operate and receiver A does not issue an alarm. Now, when the transistor Q ₂ of the switching circuit section 4 mentioned above turns on, the NOR gate NOR ₂
The output of the NOR gate NOR 1 of the first timer circuit section 7 becomes "H", and the output of the NOR gate NOR ₁ of the first timer circuit section 7 becomes "L". Therefore, the charging current of the capacitor _C1 flows through the circuit including the resistor _R1 , the capacitor _C1 , and the NOR gate _NOR1 , and starts charging the capacitor _C1 . At the same time, the output of the inverter IN ₃ of the second timer circuit section 8 is inverted from "L" to "H", and the output of the NOR gate NOR ₁ is changed to "L".
Even if the output of the NOR gate NOR ₂ returns to “L”, the capacitor C ₁ of the first timer circuit section 7
Charging will continue until the charging voltage becomes "H". Now, when the starting end of one common line lc is opened by turning off the normally closed contact b of the relay contact _r0 , the smoke detector 1a, which was operating due to the power supply from the receiver A, starts operating. When it stops working, it will come back. Also, the sensor connection line connection terminal L
Since the voltage between and the common connection terminal C is also restored,
In response to this recovery, the transistor _Q1 of the line voltage detection circuit section 2 is activated with a slight delay (for example, 0.5 seconds) due to the discharge of the charge in the capacitor _C2 .
Turn off the transistor of switching circuit section 4
Cuts off the base current of Q ₂ and turns off transistor Q ₂ . By turning off, the high-sensitivity relay Ry returns to its original state, and the normally closed contact b of the relay contact r ₀
Turn on. By turning on, the starting end of the common line lc is connected to the common line connection terminal C of the receiver A, and a DC voltage from the receiver A is applied between both lines l ₁ and lc. Power is also supplied to the smoke detector 1a, but whether the smoke detector 1a is a photoelectric type or an ion type, it takes several seconds to 10 seconds from the time the power is turned on until the smoke detection operation starts.
Since it takes about seconds, the sensor turns on again after a slight delay from the application of the DC voltage.
This on action causes the sensor connection line L ₁ and the common line LC to
The voltage between the This voltage drop is detected by the line voltage detection circuit section 2, and the switching circuit section 4 is turned on again to drive the high sensitivity relay 5. In this way, the high-sensitivity relay 5 is driven every time the smoke detector 1a operates, thereby preventing the receiving relay Ry of the receiver A from operating and self-holding. The operable period of this high-sensitivity relay 5 is defined by the time limit operation time of the first timer circuit section 7, and as the capacitor _C1 described above is charged, the charging voltage of this capacitor _C1 becomes "H". At the point when the voltage is low, the inverter _IN3 inverts the output from "H" to "L". This reversal causes the capacitor to
Charging of _C3 will start, and at the same time as this starts, the output of inverter _IN2 becomes "H". At the same time as this becomes "H", the transistor _Q3 turns on, and this turns on the base of the transistor _Q2 of the switching circuit section 4 to ground. Therefore, even if the line voltage detection circuit section 2 performs a detection operation thereafter, the switching circuit section 4 will not be turned on.
Therefore, when the smoke detector 1a operates while the transistor _Q2 is on, the receiving relay of the receiver A
Ry has a sensor connection line _l1 and the smoke detector 1a,
An exciting current flows through the common line lc and the normally closed contact b of the relay contact _r0 , operating the receiving relay Ry, forming its self-holding circuit, and causing the receiver A to issue an alarm. . Now, in the second timer circuit 8, when the charging of the capacitor _C3 progresses and the charging voltage becomes "H", that is, when time-up occurs, the output of the inverter _IN2 changes from "H" to "L".
As a result, the transistor _Q3 is turned off, and the switching circuit section 4 returns to the operable state. By the way, during the time limit operation period of the second timer circuit section 8 mentioned above, if the smoke detector 1a does not operate, the receiving relay Ry of the receiver A will not operate. This indicates that the operation of the smoke detector 1a during the time-limited operation period of No. 7 was a temporary malfunction, and false alarms due to malfunction could be prevented. If there is no sensing operation of the smoke detector 1a during the time limit operation period of the second timer circuit section 8, and if the smoke detector 1a operates after the time limit operation ends, the line voltage detection circuit section 2 and the switching circuit section 4 ,
The line opening operation by working with the high-sensitivity relay 5 is performed in the same manner as described above. In the figure, Q ₄ is a transistor that is turned on when the output of the inverter IN ₃ of the second timer circuit section 8 is "H", that is, during the time-limiting operation of the first timer circuit section ₇ ; For example, a current is passed through the red light emitting diode LED _R to cause it to emit light, indicating that the first timer circuit section 7 is in time-limited operation. LED _G is a green light emitting diode, for example, which causes a current to flow through the transistor Q ₃ when the transistor Q ₃ is turned on and emits light to indicate that the second timer circuit section 8 is in a time-limited _operation . is, for example, a yellow light emitting diode that emits light when the relay contact _r0 is switched from the normally closed contact b to the normally open contact a to indicate that the high sensitivity relay 5 is in operation. Figure 2 shows a time chart of the above-mentioned operation, in which figure a shows the sensing operation of the smoke detector 1a, and figure b
shows the operation of the high-sensitivity relay 5, c shows the time-limiting operation of the first timer circuit 7, and d shows the operation of the second timer circuit 7.
Fig. 3e shows the operation of the receiving relay Ry of the receiver A. Note that the time limit operation period of the second timer circuit section 8 is set to 30 to 40 seconds.

Next, the main points of the present invention will be described. 1st
As shown in the figure, the connection line lk is connected in parallel to the expansion terminal block 10 from the connection portion where the anodes of the diodes D ₁ to _{D 3} of the expansion terminal 9 of the line voltage detection circuit section 2 are commonly connected. That is, as shown in FIG. 3, this expansion terminal block 10 has a diode OR composed of a plurality of diodes D ₁₁ , D ₁₂ . . . D ₁ k connected to the expansion terminal 9, and a common connection terminal C. It consists of a grounding terminal section 11 connected to the common line lc, and a terminal section 12 connected to the common line lc. In addition, 13
is a terminal section for expanding the number of lines used. here,
When adding a sensor connection line ln, connect the sensor connection line ln... with the cathode of each diode _D11 ..., and connect one end of the sensor connected to the sensor connection line ln... to the common line lc. Connect to. Then, when the sensors connected to each of the added sensor connection lines ln... operate, the expansion terminal block 10 is configured with a diode OR, so it operates in the same way as described above.
This is to prevent malfunctions and provide fire alarms.

[Effect of idea]

As mentioned above, the present invention is used in fire alarm systems.
An expansion terminal block consisting of a diode OR is connected in parallel to the expansion terminals connected to multiple sensor connection lines provided in the line voltage detection circuit section of the repeater body, so the sensor connection lines can be connected in parallel. When expanding the sensor, by connecting the sensor connection line to the expansion terminal block consisting of a diode OR, it has the advantage of being able to be expanded without affecting other sensor connection lines.
Furthermore, since the expansion terminal block is constructed with diode-OR elements, it has the advantage that it can be formed at low cost and in a small space. Furthermore, the connection can be made without considering the correspondence between the common line and the sensor connection line, which uses one terminal for, for example, seven warning areas, as in the past.

[Brief explanation of drawings]

Fig. 1 is a specific circuit diagram of the main body of the repeater according to the embodiment of the present invention, Fig. 2 is a time chart for explaining the operation of the same, Fig. 3 is a circuit diagram of the expansion terminal block of the above, and Fig. 4 is
The figure is a block diagram of a conventional example. 1a is a smoke detector, 1b is a heat sensor, 2 is a line voltage detection circuit, 3 is a transmitter, 4 is a switching circuit, 5 is a high sensitivity relay, ^r0 is a relay contact, 7 is a first timer circuit part, 8 is a second timer circuit part,
9 is an expansion terminal, 10 is an expansion terminal block, _l1 is a sensor connection line, lc is a common line, and X is a repeater body.

Claims (1)

[Scope of utility model registration request] A DC voltage is applied between the sensor connection line and the common line through the reception relay in the receiver, and a transmitter, heat sensor, or smoke detector is connected in parallel between the sensor connection line and the common line. In a fire alarm system that connects a heat sensor or smoke sensor and sends an exciting current to the receiving relay through the sensor when the sensor is turned on, the applied voltage between the sensor connection line and the common line is set to a specified value. a line voltage detection circuit section that generates an output when the voltage drops to the level;
A switching circuit section that uses the detection output of the line voltage detection circuit section to drive a switching means that has a shorter operation time than the reception relay and that opens the starting end of either the sensor connection line or the common line by a switching operation. a first timer circuit section that starts a time-limited operation from the start of operation of the switching circuit section and sets the switching circuit section in an on-operable state until time-out;
a second timer circuit section that starts a time-limited operation from the time-up of the timer circuit section and sets the switching circuit section in an OFF state until a preset time elapses; A storage type repeater for a fire alarm system, characterized in that an extension terminal block consisting of a diode OR is connected in parallel to an extension terminal provided in a circuit section and connected to a plurality of sensor connection lines.