JP2864057B2 - Fire alarm test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device for a fire alarm device, and more particularly to a test device capable of performing an operation test and a non-operation test of a plurality of fire detectors.

[0002]

2. Description of the Related Art Some fire detectors used in fire alarm systems are of the on / off type. When a predetermined temperature and smoke density are detected, the ON / OFF type fire detector conducts at a low impedance between a pair of power supply / signal detector lines extending from the receiver. The receiver detects the operation of the sensor based on the current (voltage) of, and issues a fire alarm. Accordingly, the fire detector is tuned to operate at a predetermined sensitivity. This is a test voltage equivalent to a predetermined detection voltage (current). It has been confirmed that it does not operate at level 1 and that it always operates at level 2 which exceeds this level, thereby making this fire detector It is confirmed that the sensitivity is in the predetermined range. This is described in, for example, Japanese Utility Model Laid-Open Publication No. 59-147289, entitled "Testing Apparatus for Ionizing Smoke Detectors", which describes test methods as an operation test and a non-operation test. In addition, by the progressive device,
A fire alarm device that sequentially applies a test signal of a test device to a test terminal of a fire detector and sequentially performs an operation sensitivity test is proposed in, for example, Japanese Patent Application Laid-Open No. 52-42098, entitled "Fire Alarm Device". .

[0003] However, such a test device can be relatively easily tested at the stage of manufacturing a fire detector, but once installed on the site, it is necessary to remove the fire detector and perform the test. It takes time and effort. In the test method in which the test signal is sequentially applied by the sequential feeder, the voltage between the pair of detector lines drops, and the fire detector that has been activated must turn off the power supply at the fire receiver side and then recover. There was a drawback that it was not possible to proceed to the test of the fire detector.

[0004]

The problem to be solved is that the fire detector is not operated by applying a test signal sequentially by the progressive device while the on / off type fire detector installed at the site is connected. When a test and an operation test are performed, the test result of the next fire sensor cannot be detected by the fire receiver unless the test is restored each time one fire sensor is tested.

[0005]

SUMMARY OF THE INVENTION A test apparatus for a fire alarm system according to the present invention includes a fire receiver for monitoring and alarming a fire , a pair of sensor lines extending from the fire receiver, and a heat / heat detector.
A plurality of fire detectors that are activated when the detection level of a fire phenomenon such as smoke exceeds a predetermined value, conducts at a low impedance, and has a test terminal for testing operation sensitivity by a test voltage applied from the outside; A signal indicating the operating state of the fire detector performing a test is provided through the test track, and the signal is provided to be inserted into a test line extending from the fire receiver and corresponding to each of the plurality of fire detectors. A plurality of forward feeders for sending the signal to a fire receiver and connecting the upper test line to the lower test line when the test is completed, and supplying a predetermined voltage to the fire detectors to the fire receiver. Do
A test voltage generating means for generating a power supply, a non-operation test voltage which must not be operated if it is a normal fire detector, and an operation test voltage which must be operated, and a non-operation test from the test voltage generation means during the test Voltage, operation test voltage
Is applied to the test line in the order of the non-operation test voltage and the operation test voltage , and a predetermined voltage from the power supply is applied to the test line.
Test control device to apply to the above test line before applying test voltage
And an inoperative test failure detecting means for detecting an operating state during an inoperative test from a signal indicating an operating state of the fire detector detected from the test track; and An operation test failure detecting means for detecting a non-operation state during an operation test from a signal indicating an operation state is provided.

[0006]

[Function] In a fire alarm system in which a plurality of on / off fire detectors are connected in parallel to a detector line extending from the fire receiver, a test signal is output from the fire receiver, and the fire detector is sequentially turned on by a sequential feeder. Even if a non-operation test or an operation test is performed, the fire detector detects the test result of each fire detector without shutting off the power supply from the fire receiver and restoring the fire detector each time. You can know.

【Example】

An embodiment of the test apparatus for a fire alarm device according to the present invention will be described below in detail with reference to the drawings. FIG.
1 is an overall block diagram showing one embodiment of a test device for a fire alarm device of the present invention. The fire alarm device includes a fire receiver 1 for monitoring and alarming a fire, a pair of sensor lines L and C extending from the fire receiver 1 to a guard area, and a test line S; A plurality of fire detectors 2 connected between C through an interference prevention diode D1 are provided corresponding to the plurality of fire detectors 2, respectively, and are connected to a terminal P and a test terminal T of the fire detector 2. And a plurality of forward feeding devices 3.

[0008] The operation of the test apparatus of the fire alarm apparatus configured as described above will be described. The test voltage (signal) from the fire receiver 1 is supplied to the progressive device 3 via the test line S. Then, the test voltage is applied to the test terminal T of the fire detector 2 through the progressive device 3. The test voltage from the fire receiver 2 is applied in the order of the non-operation test voltage and the operation test voltage to perform the test. The progressive device 3 outputs to the test line S a signal indicating the operation state of the fire detector 2 under test. The fire receiver 1 detects an inoperative state by an inoperable test and an operating state by an operational test from the state of the test line S indicating the operating state from the fire detector 2, and detects the fire detector 2.
Is judged to be normal, and if not, it is displayed as poor sensitivity. First fire detector 2 closest to fire receiver 1
Normally terminates the test, the progressive device 3 stops outputting a signal indicating the operation state of the fire detector 2 to the test line S, and the test line S is connected to the next (lower) test line S. The fire detectors 2 are sequentially tested in this way.

As described above, the upper limit test voltage which cannot be activated by a normal fire detector by the non-operation test,
One fire detector 2 is provided by a lower limit test voltage which must be operated if the fire detector is a normal fire detector by an operation test.
In contrast, the sensitivity failure can be detected and displayed by applying the test voltage twice.

FIG. 2 is a block circuit diagram mainly showing one embodiment of a test control device of the fire receiver 1 of FIG. 1. This test control device comprises a pulse oscillator 11 for generating a pulse signal of a predetermined cycle. A monomultivibrator 12 triggered by the falling edge of the pulse of the pulse oscillator 11;
A relay 16 that is energized by the output of the monomultivibrator 12 and has a normally open contact 161, a counter 13 that counts the fall of the output pulse of the monomultivibrator 12, and an output from an output terminal A of the counter 13 A relay 17 having a biased switching contact 171;
A power supply E1 for supplying power to the fire detector 2 in a normal state, a relay 18 for detecting an operation state of the fire detector 2, a power supply E2 for a non-operation test, a power supply E3 for an operation test, and a power supply for backflow prevention The fire detector 2 via the test line S from the diodes D2 and D3, the resistors R1 to R3 and the transistor Q1.
, An AND circuit AN1 for ANDing the output terminal A of the counter 13 and the detection signal of the detection circuit, an output terminal B of the counter 13 (negation of A), and a detection signal of the detection circuit. AND circuit AND2
A malfunction detector 14 for detecting and displaying a malfunction of the fire detector 2 based on an output of the AND circuit AN1; and a malfunction detector for detecting and displaying a malfunction of the fire detector 2 based on an output of the AND circuit AN2. 15 is provided.

FIG. 3 is a block circuit diagram showing an embodiment of the progressive feeding device 3 and the fire detector 2 of FIG. 1. The fire detector 2 is an example of an ion type smoke detector which has been widely used. Is shown. This fire detector 2 has an internal ion chamber 2
1, an external ion chamber 22 into which outside air enters, a field effect transistor FT for performing impedance conversion of an intermediate electrode between the internal ion chamber 21 and the external ion chamber 22, and a resistor R4.
R5, a Zener diode ZD, and a thyristor SR. Further, the progressive device 3 includes a resistor R
6, R7, capacitors CA and CB, and diode D
4, D5, a flip-flop circuit FF for detecting operation of the fire detector 2, analog switches AW1 and AW2 for controlling connection between the fire detector 2 and the test line S, and a NOT circuit IN. I have.

The operation of the test control circuit of the fire receiver 1, the fire detector 2, and the progressive feeding device 3 configured as described above will be described with reference to the timing chart shown in FIG. Normally, the fire detector 2 is supplied with power of a predetermined voltage from the power supply E1 of the fire receiver 1 via the relay 18, the detector lines L and C and the diode D1. When smoke at the time of fire enters the external ion chamber 22, the field effect transistor FT
, The current flows between the source and drain, causing a voltage drop across the resistor R5. When this voltage exceeds the Zener voltage of Zener diode ZD, thyristor S
A current flows through the gate of R, and the thyristor SR is kept conductive and enters the operating state. The sensitivity is determined by the resistance value of the resistor R5 and the Zener voltage of the Zener diode ZD, and the operation is performed at a predetermined smoke density. When a test voltage is applied from the fire receiver 1 via the test line S to the connection point (test terminal T) between the external ion chamber 22 and the resistor R4, the potential of the intermediate electrode (gate electrode) increases. The state is the same as when smoke was detected. From the relationship between the smoke density measured in advance and the potential of the intermediate electrode, a sensitivity test can be performed using a test voltage.

When performing an operation test and a non-operation test of the fire detector 2, the test control circuit shown in FIG. 2 is driven.
The pulse oscillator 11 outputs a pulse W1 (FIG. 4) having a predetermined cycle. The falling of the pulse W1 triggers the monomultivibrator 12 to output a relatively short pulse W2. This output energizes the relay 16, closes its normally open contact 161 and applies the power E1 to the test line S via the resistor R1. At this time, the capacitor CB of the progressive feeding device 3 is charged via the diode D4 and the fire detector 2 is charged.
Used as a power supply for This is to prevent trouble even when another fire detector 2 has already operated and the detector lines L and C are short-circuited and power is not supplied. The counter 13 is triggered by the falling edge of the output pulse W2 of the monomultivibrator 12, and outputs the frequency-divided pulse W3 to the output terminal A. On the other hand, the output terminal B outputs an inverted pulse of the pulse W3. Counter 1
The relay 17 is driven by a pulse W3 from the third output terminal A. The switching contact 171 is connected first to the power source E2 and then to the power source E3 and repeats this. Therefore, the test line S
Outputs a voltage waveform W4.

When the voltage from the power supply E1 is supplied to the test line S via the resistor R1, the progressive feeding device 3
4, the capacitor CB is charged. On the other hand, the resistance R
Since the capacitor CA connected via 6 is supplied for a short time from the power source E1, the process ends without charging. Since the flip-flop circuit FF is reset when the power is turned on, the output terminal B is at a high level, the analog switch AW1 is in a conductive state, and the analog switch AW2 is in a cut-off state. Therefore, the power charged in the capacitor CB is supplied to the fire detector 2 via the resistor R7 and the diode D5, and even if power is not supplied between the detector lines L and C, the monitoring is enabled. When the power supply is completed, the non-operation test voltage of the power supply E2 is supplied to the test line S. Since this time is relatively long, the test terminal T of the fire detector 2 is not affected by the capacitor CA and is not affected by the capacitor CA. Supplied to
At this test voltage, the normal fire detector 2 does not operate. When the non-operation test is completed, the power supply E1
Power is supplied for a short time. Next, when an operation test voltage is supplied from the power supply E3, the fire detector 2 is activated if it is normal, and the terminals P and E are electrically connected. When this operation test is completed, power is again supplied from the power supply E1, but since the fire detector 2 is operating, a resistor R1, a test line S, a diode D4, an analog switch AW1, a resistor R7, a diode D5 are provided between the power supply E1. Fire detector 2, detector track C
And a current flows. When a current flows through the resistor R1, the transistor Q1 becomes conductive, and the resistor R3
A signal indicating that the fire detector 2 has been activated. This is a signal indicating the operation state of the fire detector 2 detected from the test line S. When the fire detector 2 is in the operating state, the input of the negation circuit IN is at the low level and the output is at the high level. Becomes conductive. The test line S is separated from the fire detector 2 and connected to the subsequent (lower) test line S. The voltage of the test line S is equal to the resistance R
Although the voltage is slightly reduced by the divided voltage by the resistor 1 and the resistor R7, it does not interfere with the power supply of the fire detector 2.

If the fire detector 2 operates due to poor sensitivity during the non-operation test, a signal is generated at the resistor R3, and the non-operation test failure pulse X1 is output to the output W5 of the AND circuit AN2. When the pulse X1 is output, the malfunction detector 15 detects the malfunction and notifies the fire detector 2 of the sensitivity defect. If the sensitivity of the fire detector 2 is not good due to the poor sensitivity during the operation test, the operation signal pulse X2 is not detected in the output W6 of the AND circuit AN2, and the absence of this operation signal pulse X2 is determined by the output pulse of the monomultivibrator 12. In synchronism with W2, the malfunction is detected by the malfunction detector 14, and the sensitivity of the fire detector 2 is notified.

[0016]

As described above, the fire alarm testing apparatus according to the present invention sequentially performs a non-operation test and an operation test of a plurality of fire detectors, shuts off the power of the fire detectors that have been operated, and individually operates the fire detectors. There is an effect that the fire receiver can detect and know the sensitivity defect of the fire detector without recovering.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a test device for a fire alarm device of the present invention.

FIG. 2 is a block circuit diagram showing one embodiment of the fire receiver of FIG. 1;

FIG. 3 is a block circuit diagram showing one embodiment of the fire detector and the progressive device of FIG. 1;

FIG. 4 is a timing chart for explaining the operation of the test apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire receiver 2 Fire detector 3 Progressive feeder 11 Pulse oscillator 12 Mono-multi vibrator 13 Counter 14 Malfunction detector 15 Malfunction detector 16 Relay 17 Relay 18 Relay 21 Internal ion chamber 22 External ion chamber E1 Power supply E2 Non-operation Test voltage power supply E3 Operation test voltage power supply D1 to D5 Diode R1 to R7 Resistance Q1 Transistor AW1 Analog switch AW2 Analog switch CA Capacitor CB Capacitor FF Flip-flop FT Field effect transistor ZD Zener diode SR Thyristor IN Negation circuit

Claims (1)

(57) [Claims] 1. A fire receiver for monitoring and alerting a fire , a pair of sensor lines extending from the fire receiver,
A plurality of fire detectors that are activated when the detection level of a fire phenomenon such as smoke exceeds a predetermined value, conducts at a low impedance, and has a test terminal for testing operation sensitivity by a test voltage applied from the outside; A signal indicating the operating state of the fire detector performing a test is provided through the test track, and the signal is provided to be inserted into a test line extending from the fire receiver and corresponding to each of the plurality of fire detectors. A plurality of forward feeders for sending the signal to a fire receiver and connecting the upper test line to the lower test line when the test is completed, and supplying a predetermined voltage to the fire detectors to the fire receiver. Do
A test voltage generating means for generating a power supply, a non-operation test voltage which must not be activated if it is a normal fire detector, and an operation test voltage which must be activated, and a non-operation from the test voltage generation means during the test. Test voltage, operation test voltage
Is applied to the test line in the order of the non-operation test voltage and the operation test voltage , and a predetermined voltage from the power supply is applied to the test line.
Test control device to apply to the above test line before applying test voltage
And an inoperative test failure detecting means for detecting an operating state during an inoperative test from a signal indicating an operating state of the fire detector detected from the test track; and A test device for a fire alarm device, comprising: an operation test failure detecting means for detecting a non-operation state during an operation test from a signal indicating an operation state .