JPH053638B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a fire receiver in automatic fire alarm equipment, and relates to identification of operational quality through smoke tests and district relay operation tests (fire tests). .

[Background technology]

The conventional fire receiver, as shown in Figure 2,
Connect one end of the series circuit of the recovery relay Rr and transistor Tr ₂ for sensor recovery to the positive power supply line P connected to the positive pole of the 24V DC power supply, and use the other end of this series circuit to switch the switch SW ₁ . Connect to terminal (automatic recovery side) a, and turn this switch
The common terminal of SW ₁ is connected to a negative power supply line N connected to the negative pole of a 24V DC power supply. One end of the normally closed contact (recovery contact) rr of the recovery relay Rr is connected to the positive power line P, and the other end of the normally closed contact rr is connected to the positive power line P'.

One end of each district relay Ry ₁ to Ry _o is connected to the positive power supply line P′, and this district relay Ry ₁ to Ry _o
Sensor connection terminals L ₁ to _{L o} are provided at the other ends, and a common connection terminal C is provided to the negative power supply line N, and the sensor connection terminals L ₁ to _{L o} and the common connection terminal C are provided. In between, self-holding smoke detectors S ₁ to _{S o} installed in each warning area are connected via signal lines.

Furthermore, series circuits of normally closed contacts ry ₁₁ to ry _o1 of district relays Ry ₁ to _{Ry o} and fire lights LT ₁ to LT _o are connected between the positive power supply line P' and the negative power supply line N, respectively. The normally open contacts RY ₁₂ to RY _O2 for self-holding of relays Ry ₁ to Ry _o are connected to the other end of each district relay Ry ₁ to _{Ry o} and the switching terminal of changeover switch SW ₁ (self-holding side)
b, respectively.

Furthermore, one end of a series circuit of resistors R ₆ and R ₇ is connected to the positive power supply line P′, and diodes D ₁₁ to D _o1 are connected between the other end of this series circuit and district relays Ry ₁ to Ry _o , respectively. and the other end of district relays Ry ₁ to Ry _o and the line selection switch (rotary switch)
Diodes D ₁₂ to D _o2 are connected between each selection terminal of SR, and a wiring pseudo resistance is connected between the common terminal of this line selection switch SR and the negative power supply line N.
A series circuit of R ₀ and test switch SW ₂ is connected.

In addition, a series circuit of resistors R ₂ and R ₃ is connected between the positive power supply line P' and the emitter of transistor Tr ₂ , and a series circuit of transistor Tr ₁ , resistor R ₁ , programmable union transistor PUT, and resistors R ₄ and R ₅ . The gate of the programmable union transistor PUT is connected to the connection point of resistors R ₂ and R ₃ , and the anode is also connected to the capacitor.
Connected to the connection point of resistors R ₂ and R ₃ through C ₂ and a programmable union transistor
Connect capacitor C ₁ in parallel to the series circuit of PUT, resistors R ₄ and R ₅ , and connect the base of transistor Tr ₁ to the resistor.
It is connected to the connection point of R ₆ and R ₇ , and the base of transistor Tr ₂ is connected to the connection point of resistors R ₄ and R ₅ .

This fire receiver is equipped with a toggle switch when a fire alarm occurs.
Switch SW ₁ to side b and turn off test switch SW ₂ . In this state, for example, if sensor S ₁ detects smoke and becomes conductive, it becomes self-holding state.
District relay Ry ₁ is energized. As a result, the normally open contact r ₁₁ closes and the fire light LT ₁ lights up, and the normally open contact r ₁₂ closes and the district relay Ry ₁ enters the self-holding state, and a contact not shown in the figure issues an alarm, etc. The same operation is performed when the other sensors S ₂ to _{S o} detect a fire.

For example, when sensor _S1 senses smoke and becomes conductive, current flows through the circuit of resistors _R6 , _R7 , and diode _D11 , and a voltage drop occurs across resistor _R6 , causing a transistor
Tr ₁ is turned on, and the timer circuit TM operates to turn on the transistor Tr ₂ after, for example, 5 seconds have elapsed, but since the changeover switch SW ₁ has been switched to the b side, the recovery relay Rr does not operate.

Next, during the smoking test, set the changeover switch SW ₁ to a
switch to the side, and leave test switch SW ₂ off. In this state, for example, if smoke is applied to the sensor S ₁ , if all the parts are normal, the sensor S ₁ will sense the smoke and become conductive, entering a self-holding state and energizing the district relay Ry ₁ . As a result, the normally open contact r ₁₁ closes and the fire light LT ₁ lights up, while the normally open contact r ₁₂
closes and district relay Ry ₁ enters the self-holding state.

Also, due to the conduction of the sensor S ₁ , the resistance
When R ₆ and R ₇ are energized, a voltage drop occurs across resistor R ₆ .
Transistor Tr ₁ turns on. transistor
When Tr ₁ is turned on, the capacitor is connected through resistor R ₁ .
After C ₁ is charged and the charging voltage exceeds the divided voltage of resistors R ₂ and R ₃ for 5 seconds, for example, the programmable union transistor PUT becomes conductive and turns on the transistor Tr ₂ . As a result,
Recovery relay Rr operates and its normally closed contact rr opens, the power supply to the positive power supply line P′ is temporarily cut off, the power supply to district relay Ry ₁ is stopped, and its normally open contact rr opens.
ry ₁₁ opens and fire light LT ₁ goes out, normally open contact ry ₁₂
is opened and the power supply to the positive power supply line P′ is cut off, transistor Tr ₁ is turned off and the operation of the timer circuit TM is also stopped, and therefore transistor Tr ₂ is turned off and the recovery relay is activated. Power to Rr is stopped, normally closed contact rr is closed, and power is again supplied to the positive power supply line P'. If smoke is still applied to sensor S ₁ at this time, the above operation will be repeated, and if smoke is stopped, sensor S ₁ will be in a non-conducting state (alert state). Operation stops.

If something is wrong, you will know that something is wrong because the fire light LT ₁ will not light up. The same applies to the smoke test for the other sensors S ₂ to _{S o} .

Next, when testing the operation of district relays Ry ₁ to _{Ry o} ,
The changeover switch SW ₁ may be set in either direction, and the changeover switch SW ₂ is turned on. Then, when the line selection switch RS is sequentially switched, the diodes D ₁₂ to D _o2 and the resistor R ₀ are connected to the district relays Ry ₁ to _{Ry o.}
and test switch SW ₂ are energized sequentially,
The fire lights LT ₁ to LT _o will turn on in sequence, and by checking the lighting of the fire lights LT ₁ to _{LT o} , it is possible to determine whether the district relays Ry ₁ to Ry _o are good or bad.

However, in the above fire receiver, when performing an operation test of the district relays Ry ₁ to _{Ry o} , if the changeover switch SW ₁ is switched to the a side, the timer circuit TM will operate, so the restoration will occur at each set time. District relay Rr operates, normally closed contact rr opens, and positive power supply line P′ is disconnected, so district relays Ry ₁ to Ry _o
During the operation test, the fire lights LT ₁ to LT _o suddenly went out, and there was a risk that the district relays Ry ₁ to Ry _o could be mistakenly judged to be abnormal.

On the other hand, if the changeover switch SW ₁ is switched to the b side, the recovery relay Rr will not operate and _the above- _mentioned problem will not occur. Once the relays Ry ₁ to Ry _o operate, their status is self-maintained, and each time the line selection switch RS is switched, the current consumption increases, which poses a problem in terms of current capacity. It was necessary to restore the district relays Ry ₁ to Ry _o each time, and the operation test of the district relays Ry ₁ to _{Ry o} could not be performed smoothly.

[Purpose of the invention]

This invention is capable of automatically shutting off the power supply to restore the sensor during a smoke test of the sensor, and restoring the district relay to operate without shutting off the power supply during a district relay operation test. It is an object of the present invention to provide a fire receiver that can prevent erroneous determination of pass/fail.

[Disclosure of the invention]

The fire receiver of the present invention includes a recovery contact inserted into one power line, a recovery relay whose one end is connected to the one power line and which drives the recovery contact to open, and a first switching element. a series circuit of the recovery relay and the first switching element, a changeover switch having one switching terminal connected to the other end of the series circuit of the recovery relay and the first switching element, and a common terminal connected to the other power supply line; A district relay with one end connected on the non-power side of the restoration contact, and a pair of sensor connection terminals to which the other end of the district relay and the sensor connected to the other power line are connected when a fire is detected. , a self-holding contact of the district relay connected between the other end of the district relay and the other switching terminal of the changeover switch, and the other end of the district relay having one end connected to the one power supply line. and a second switching element that is turned on when conduction occurs between the first and second power supply lines; a timer circuit that is supplied with power through the second switching element and turns on the first switching element after a predetermined time delay; a test switch having one end connected to the other end via a reverse current blocking diode and the other end connected to the other power supply line; The present invention includes a power supply cutoff circuit that forcibly cuts off the power supply to the timer circuit when the test switch is turned on.

In this way, the test switch and the power input terminal of the timer circuit are connected by a power supply cutoff circuit, and when the test switch is turned on, the power supply to the timer circuit is forcibly cut off to perform a recovery operation. During an operation test, the district relay can be restored without shutting off the power, and erroneous judgments in operation confirmation can be prevented. In addition, the smoke test for the sensor can be performed by cutting off the power and automatically restoring the sensor.

Embodiment An embodiment of the present invention will be described based on FIG. 1. This fire receiver has a resistance R ₁ in Fig. 2
A diode D ₁ is inserted between the programmable union transistor PUT and the programmable union transistor PUT to prevent current from flowing in, and the connection point between the resistor R ₁ and the diode D ₁ is wired via the diode D ₂ to the pseudo resistance R ₀ and the test switch SW. The other configuration is the same as in Figure ₂ .

This fire receiver is equipped with a toggle switch when a fire alarm occurs.
Switch SW ₁ to side b and turn off test switch SW ₂ . In this state, for example, if sensor S ₁ detects smoke and becomes conductive, it becomes self-holding state.
District relay Ry ₁ is energized. As a result, the normally open contact r ₁₁ closes and the fire light LT ₁ lights up, and the normally open contact r ₁₂ closes and the district relay Ry ₁ enters the self-holding state, and a contact not shown in the figure issues an alarm, etc. The same operation is performed when the other sensors S ₂ to _{S o} detect a fire.

For example, when the sensor S ₁ detects smoke and becomes conductive, current flows through the circuit through the resistors R ₆ , R ₇ and the diode D ₁₁ , and a voltage drop occurs across the resistor R ₆ , causing a transistor (second switching element). Tr ₁ turns on,
The timer circuit TM operates and turns on the transistor Tr ₂ after, for example, 5 seconds, but the changeover switch
Since SW ₁ has been switched to the b side, the recovery relay
Rr doesn't work.

Next, during the smoking test, set the changeover switch SW ₁ to a
switch to the side, and leave test switch SW ₂ off. In this state, for example, if smoke is applied to the sensor S ₁ , if all the parts are normal, the sensor S ₁ will sense the smoke and become conductive, entering a self-holding state and energizing the district relay Ry ₁ . As a result, the normally open contact r ₁₁ closes and the fire light LT ₁ lights up, while the normally open contact r ₁₂
closes and district relay Ry ₁ enters the self-holding state.

Also, due to the conduction of the sensor S ₁ , the resistance
When R ₆ and R ₇ are energized, a voltage drop occurs across resistor R ₆ .
Transistor Tr ₁ turns on. transistor
When Tr ₁ is turned on, the capacitor is connected through resistor R ₁ .
After C ₁ is charged and the charging voltage exceeds the divided voltage of resistors R ₂ and R ₃ , for example after 5 seconds, the programmable union transistor PUT becomes conductive and the transistor (first switching element)
Turn on Tr ₂ . As a result, recovery relay Rr operates and its normally closed contact (recovery contact) rr opens,
The power supply to the positive power line P′ is temporarily cut off, the district relay Ry ₁ is de-energized, the normally open contact ry ₁₁ is opened, the fire light LT ₁ is extinguished, the normally open contact ry ₁₂ is opened, Furthermore, when the power supply to the positive power supply line P′ is cut off, transistor Tr ₁ is turned off and the timer circuit is turned off.
The TM also stops working and therefore the transistor
Tr ₂ is turned off, power to the recovery relay Rr is stopped, the normally closed contact rr is closed, and power is supplied to the positive power supply line P' again. If smoke is still applied to sensor S ₁ at this time, the above operation will be repeated, and if smoke is stopped, sensor S ₁ will be in a non-conducting state (alert state). Operation stops.

If something is wrong, you will know that something is wrong because the fire light LT ₁ will not light up. The same applies to the smoke test for the other sensors S ₂ to _{S o} .

Next, when testing the operation of district relays Ry ₁ to _{Ry o} ,
The changeover switch SW ₁ may be switched to either direction, and the test switch SW ₂ is turned on. Then, when the line selection switch RS is sequentially switched, the diodes D ₁₂ to D _o2 and the resistor R ₀ are connected to the district relays Ry ₁ to _{Ry o.}
and test switch SW ₂ are energized sequentially,
The lights LT ₁ to LT _o will be lit in sequence,
By checking that the fire lights LT ₁ to _{LT o} are lit, it is possible to determine whether the district relays Ry ₁ to _{Ry o} are good or bad.

Note that when test switch SW ₁ is turned on, the positive side of capacitor C ₁ connects to the negative power supply line N as a diode.
D ₂ and test switch SW ₂ will be connected, and capacitor C ₁ will not be charged;
Therefore, the programmable union transistor PUT does not conduct, and the recovery relay Rr does not operate.If the changeover switch SW ₁ had been switched to the a side, the operation of the district relays Ry ₁ to _{Ry o} would not have been activated during the operation test. The fire lights LT ₁ to LT _o will not suddenly turn off, and the fire lights LT ₁ to LT _o will be turned on selectively in sequence according to the switching of the line selection switch RS, and the district relays Ry ₁ to Ry It is possible to prevent erroneous judgments regarding the operation quality of _o . Diode _D1 is provided to prevent current from flowing around.

〔Effect of the invention〕

In the fire receiver of this invention, the test switch and the timer circuit are connected by a power supply cutoff circuit, and when the test switch is turned on, the power supply to the timer circuit is forcibly cut off to prevent a recovery operation. During testing, the district relay can be restored without shutting off the power, and erroneous judgments in operation confirmation can be prevented. In addition, the smoke test for the sensor can be performed by cutting off the power and automatically restoring the sensor.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional fire receiver. P, P'...Positive power line (one side), N...Negative power line, Rr...Recovery relay, rr...Normally closed contact (recovery contact), Tr ₂ ...Transistor (second switching element), Tr ₁ ... Transistor (first switching element), SW ₁ ... changeover switch, SW ₂ ... test switch, Ry ₁ - Ry _o ... district relay, S ₁ - _{S o} ... sensor, D ₁₂ - D _o2 ... diode, D ₂ ... Diode (power supply cutoff circuit), TM...timer circuit, _L1 to L _o ...sensor connection terminal, C...common connection terminal, SR...line selection switch, ry ₁₂ to ry _o2 ...normally open contact (self-holding contact) .

Claims (1)

[Claims] 1 A recovery contact inserted into one power line,
a series circuit of a recovery relay and a first switching element for opening and driving the recovery contact, one end of which is connected to the one power supply line; and the other end of the series circuit of the recovery relay and the first switching element. A changeover switch with one switching terminal connected to the power line and a common terminal connected to the other power line, a district relay with one end connected to the non-power side of the recovery contact to the one power line, and another of the district relays. A pair of sensor connection terminals are provided at the end and the other power line, respectively, and to which a sensor that conducts when a fire is detected are connected, and a connection is made between the other end of the district relay and the other switching terminal of the changeover switch. a second switching element having one end connected to the one power line and turned on when conduction occurs between the other end of the district relay and the other power line; a timer circuit that is supplied with power through the second switching element and turns on the first switching element after a predetermined time delay; one end is connected to the other end of the district relay via a backflow blocking diode, and the other end is connected to the other power supply line. and a power supply cutoff circuit that is provided between a power input terminal of the timer circuit and one end of the test switch and forcibly cuts off the power supply to the timer circuit when the test switch is turned on. fire receiver.