JPH10208166A - Fire warning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire warning machine which can easily conduct the test of a fire sensor from outside a house. SOLUTION: The plural fire sensors 4 are connected to signal lines 2 and 3 from a reception part-side. The reception part-side usually supplies power voltage, and supplies test voltage with potential different from that of power voltage to the signal lines when the test starts. The respective fire sensors 4 are provided with suppression means for supplying power voltage to the low-order fire sensors, they execute test operation at the time of detecting test voltage, release the suppression means later and output test voltage to the low-order fire sensors. The respective fire sensors 4 can execute the test operation in order one by one from the high-order fire sensor and can individually conduct the test while the other fire sensors execute the fire detection operation without using a transmission signal and a different inspection line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm which can remotely test fire detectors scattered in a dwelling unit from outside the dwelling unit.

[0002]

2. Description of the Related Art Conventionally, an operation test of a fire detector has been performed by actually applying heat or smoke using a heating tester or a smoke tester depending on the type of the detector. Also, a test in which heat or smoke is directly applied takes human time and contaminates the detector, so apply a test voltage to the circuit inside the fire detector and operate the detector to perform a simulated test. There are various test methods.

[0003]

When a fire alarm provided in a dwelling unit is inspected, the resident may not be present. For example, if there is a manager of a dwelling unit, you can request to be present and enter the dwelling unit.
It takes time. In general, even a fire alarm checker does not like to put another person in the dwelling unit, and the inspection work is often troublesome.

Japanese Patent Application Laid-Open No. Hei 5-34695 discloses that an adapter specified by a frequency has a test voltage applied to the fire detector for the purpose of individually performing an inspection input to the fire detector from outside the dwelling unit from the outdoor display. There is disclosed a fire alarm which generates and generates an operation test. However, in the fire alarm disclosed in this publication, it is necessary to individually adjust the frequency of the signal transmission circuit of the adapter and the outdoor indicator, and the test result is an outdoor buzzer that is sounded based on the operation of the fire receiver. Has been confirmed.

[0005] It is an object of the present invention to provide a fire alarm which can easily perform a test of a fire detector from the outside of a dwelling unit.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention relates to a fire alarm in which a plurality of fire detectors are connected to a signal line from a receiving unit such as a fire receiver. The receiving unit always supplies the power supply voltage via the signal line, and the fire detector that detects the fire generates a fire signal by switching the signal line to a substantially short-circuited state, etc. The unit detects the switching operation and performs a fire alarming operation, and the receiving unit supplies a test voltage having a potential different from the power supply voltage to the signal line at the start of the test, and each fire detector includes: In addition to the suppression means for supplying the power supply voltage to the lower fire detector when the test voltage is input from the upper level, the test operation is performed when the test voltage is detected, and then the suppression means is released to release the lower fire detector. Output test voltage to sensor And it is characterized in Rukoto.

Therefore, each fire detector supplies the power supply voltage to the lower level even after detecting the test voltage, and supplies the test voltage to the lower level after the test operation. The test operation can be performed, and the test can be individually performed without using a transmission signal or a separate inspection line while performing the fire detection operation by another fire detector.

A line switch is arranged between the signal line receiving section and each fire detector, and a checker is connected to the line switch at the time of inspection, and the line switch is connected to each fire detector. The signal line is disconnected from the receiving unit and connected to an inspection device. The inspection device can supply a power supply voltage to the signal line and output a test voltage.

Thus, even if the fire receiver as a receiving unit does not have an inspection function, it is possible to cause each fire detector to perform a test operation by using the inspector, and to connect the connector of the line switcher to the outside. The fire alarm can be inspected from outside even if the fire alarm itself is in the house.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a configuration diagram schematically showing an embodiment of the system.

For example, a plurality of fire detectors 4 provided in each room or the like are sequentially fed to a power / signal line including a common line 2 and a line line 3 drawn from a fire receiver 1 provided in a living room in a dwelling unit. Connected and their signal lines 2, 3
A terminating resistor 5 is connected to the rear end.

In addition, between the fire detectors 1 of the signal lines 2 and 3 and each fire detector 4, a line switcher which normally connects and connects the common line 2 and the line line 3 to the fire receiver 1 is provided. 6 are arranged. An inspection output line 9 is provided from the line switch 6 to the fire receiver 1 side.

Normally, each fire detector 4 is connected to the signal lines 2 and 3
The fire monitoring operation is performed by the power supply supplied from the fire receiver 1 through the switch, and when a fire is detected, the switching operation is performed to bring the signal lines 2 and 3 into a low-impedance substantially short-circuit state. The fire receiver 1 detects a substantially short-circuit state based on the switching operation and performs a fire notification operation. At this time, for example, the fire receiver 1 is not provided with a dwelling unit receiver, which is not provided with a dwelling unit receiver (not shown) for performing a fire display on an outdoor display 10 provided and connected to the entrance and connected thereto. , A necessary fire signal is output to the living room receiver.

At the time of inspection, a connector 11 pulled out from the track changer 6 to the outside, for example, to the outdoor display 10 side,
The checker 12 is connected to the connector. On the basis of the inspection operation from the inspection device 12, the line switch 6 outputs an inspection start output to the fire receiver 1 via the inspection output line 9, displays the inspection being performed on the fire receiver 1, and detects each fire. Disconnect the signal lines 2 and 3 to the fire detector 1 from the fire receiver 1
Connect to 2. In this state, the fire receiver 1 performs an inspection display based on the inspection start output of the track changer 6, and the outdoor inspection from the inspector 12 is enabled. At this time, each fire detector 4 operates with the power supply voltage (12 V in this case) supplied from the checker 12 through the signal lines 2 and 3.

There are three modes from the inspection device 12, an outdoor inspection mode for performing a test from outside without entering the room and judging the quality of the entire system, and an outdoor inspection mode when there is an abnormality in the inspection mode. And a sensor specifying mode for specifying the location of the abnormal fire detector and a sensor specifying mode for specifying only the specific sensor.

FIG. 2 shows the output between the terminals C and L of the detector 12 to the signal lines 3 and 4 and the terminal CI of each fire detector 4 in the outdoor inspection mode when n fire detectors 4 are connected. , LI
It is a waveform input between the terminals C and L detected by the checker 12 during the input. The checker 12 connects the terminal C to the signal lines 3 and 4.
A test voltage (24 V in this case) is applied as an inspection input from L and the width is, for example, 5 m at the timing shown in FIG.
At S, pulses A, B, and C from the test voltage to the power supply voltage are output.

As will be described later, the voltage between the terminals LI and LO of each fire detector 4 is controlled so as not to be higher than the power supply voltage. The first detector in the waveform of FIG. When a test voltage is applied, a control circuit such as a built-in microcomputer rises, and an inspection operation starts when the pulse A1 falls. In this inspection operation, if the sensor is a photoelectric smoke detector, it usually emits light at intervals of about 3 seconds and a fire is detected by two consecutive detections. Check once by detecting. In the case of a thermistor-type heat sensor, inspection is performed by connecting a fixed resistor in parallel to the thermistor. Furthermore, even in a heat sensor using a bimetal or an air chamber, the contact mechanism performs a closing operation, and inspection is performed by a pseudo input method. Here, the interval TW1 between the pulse A and the pulse B in FIG. 3 is a time sufficient for each fire detector 4 to perform an inspection operation, for example, 0.
5 seconds.

If the first sensor is normal based on the inspection result, the voltage between the terminals CI and LI is reduced to the power supply voltage for a predetermined time from the fall of the pulse B1 (alternative to the switching operation). The waveform of the signal appears in the waveform between terminals C and L of the inspection device 12 in FIG. The corresponding interval TW2 between the pulse B and the pulse C in FIG. 3 may be a time that can be detected by the inspector 12 as an inspection signal for confirming operation.
0 ms, and the predetermined time is set to 20 ms or less. Then, when detecting the falling edge of the pulse C1 in FIG.
The voltage suppression between I and LO is released, and as a result, the pulse C1 is released.
Is completed, a test voltage is applied to the terminal LI of the second sensor as a check input, and the built-in microcomputer starts up. The corresponding interval TW between pulse C and the next pulse A in FIG.
Reference numeral 3 denotes a time sufficient for preparation for an inspection operation such as start-up of a microcomputer for a control circuit, for example, 30 mS.

Then, the falling of the pulse A2 in FIG. 2 causes the second sensor to start an inspection operation. At this time, the first sensor simultaneously transmits the test voltage from the terminal LI to the LO. The monitoring operation is performed as usual, and the inspection operation is not performed. After the inspection of the last n-th sensor is completed, the inspection device 12 completes the inspection of all the sensors after the elapse of the inspection time obtained by adding the maximum number of connectable timings, and starts supplying the power supply voltage. . Each sensor 4 detects the continuous supply of the power supply voltage, makes the voltage between the terminals LI and LO effective, and returns to the normal monitoring state.

Here, the end of the inspection may be determined by an increase in current based on the number of connected sensors, and a change amount of, for example, 2.4 mA to 1.2 mA when 10 sensors are connected.

As described above, in the outdoor inspection mode, a signal having a test voltage higher than the power supply voltage is transmitted to the terminal LI of each sensor 4 using the signal lines 3 and 4 and the terminal LO is output after the inspection operation.
The test voltage is output from, so that the individual fire detectors are made to perform the inspection operation in order, and the inspection signal based on the inspection result is sent to the nth detector except for the pulse output between the terminals C and L of the inspector 12. , It is possible to grasp the number of sensors whose inspection operation has been completed normally and the number of abnormal sensors. The fire detectors connected to the same signal lines 2 and 3 except for the inspection are supplied with the power supply voltage via the power supply / signal lines 2 and 3, so the fire monitoring is continued and a fire is detected. The detector can emit a normal fire signal. The inspection device 12 determines that a fire has occurred by detecting a substantially short-circuit state due to the switching operation (in the case of not replacing the switching operation, the switching operation is not synchronized with the interval TW2 between the pulses B and C in FIG. 3).

Next, a description will be given of a sensor specifying mode for specifying the location of the abnormal fire detector when there is an abnormality in the outdoor inspection mode. FIG. 4 shows a waveform representing the interval at this time.

Voltage suppression is effective between the terminals GI and GO of each of the fire detectors 4 after the end of the outdoor inspection mode, for example.
The checker 12 outputs pulses A1 to Cn having a pulse width of 5 mS as in FIG.

In the first sensor, the built-in microcomputer rises when a voltage is applied to the terminal GI, and starts an inspection operation when the pulse A1 falls. Then, as shown in FIG. 4, the interval TW4 between the pulse A and the pulse B in the sensor specific mode is different from the above-described outdoor inspection mode, and the pulse B is immediately transmitted, for example, 20 mS. When the pulse B is detected by the short timing, the sensor stops the inspection operation, and based on the inspection result in the immediately preceding outdoor inspection mode stored in the microcomputer, if the abnormality is not abnormal, the confirmation light is provided for a predetermined time from the fall of the pulse B. Lights up. The operation interval TW5 is a time during which the confirmation light can be visually confirmed sufficiently to identify the sensor indoors, for example, 0.5 seconds, and the predetermined time is 0.5 seconds or less. In this predetermined time, a waiting time is set at the beginning of the pulse B so that a difference from a later-described designated mode can be detected. Then, as in the outdoor inspection mode, when the falling of the pulse C1 is detected, the first sensor sends out the power supply voltage from the terminal LO, and the test voltage is applied to the terminal LI of the next sensor as an inspection input. Similarly, the built-in microcomputer starts up. The interval TW3 between the pulse C and the next pulse A is the same as described above.

As described above, in the sensor identification mode, the fire detector 4 is caused to turn on the confirmation lamp based on the inspection result up to the n-th sensor using the result of the immediately preceding outdoor inspection mode. is there. That is, even if the presence or number of an abnormal sensor is known in the outdoor inspection mode, the position cannot be specified specifically, and the actual wiring may be different even with detailed equipment data. Therefore, in the sensor identification mode, it can be visually confirmed that a normal sensor is turned on and an abnormal sensor is not turned on, and is an effective means for confirming a normal sensor at a specific position. Also, as in the outdoor inspection mode, it goes without saying that the detectors other than the one being inspected continue to monitor the fire.

Next, a sensor designation mode for confirming the location of the specified abnormal fire detector will be described.
The waveform at this time is shown in FIG. 5, as in FIGS. In this mode, the number of the sensor to be checked by the checker 12 is specified (for example, the second), and the checker 12 outputs a pulse only at the specified sensor at the same timing as in FIG. For the sensor, as shown in FIG.
And the interval between the pulses C are shortened, for example, to 20 mS.

Voltage suppression is always applied between the terminals LI and LO of each fire detector 4 as in the above-described modes. Pulses A1 to Cn having a pulse width of 5 mS are output as in the above. The built-in microcomputer of the sensor rises when a test voltage is applied to the terminal LI, and the inspection operation starts when the pulse A falls. Then, the pulse B is transmitted immediately, the inspection operation is interrupted, and the pulse C falls within the waiting time from the fall of the pulse B based on the inspection result of the immediately preceding outdoor inspection mode, and the confirmation lamp is not turned on. Regarding this operation time, the interval between the pulses B2 and C2 for the second sensor is a time during which the confirming light can be visually confirmed sufficiently to specify the sensor indoors. Sensors other than the second (first or n
With regard to the third), the inspection device 12 is operated at the timing shown in FIG.
, A pulse output is performed, and forward feeding is performed at an early timing.

As described above, in the sensor designation mode, similarly to the sensor identification mode, each fire sensor uses the result of the outdoor inspection mode to turn on the confirmation lamp based on the inspection result up to the nth sensor. 4, but only the designated sensors are turned on for a sufficient time, and the other sensors are shortened. Therefore, the sensor designation mode is an effective means for confirming that the sensor is abnormal. Also, as in the other modes, it goes without saying that the detectors other than those under inspection are continuing the fire monitoring.

FIG. 6 is a schematic circuit diagram of the fire detector 4 used in the system of FIG.

The fire detector 4 is provided with a constant voltage circuit B2 for supplying a stable voltage and current using the terminals CI and LI to which the power / signal lines 2 and 3 are connected, respectively, and for charging the resistor and the capacitor. When a fire is determined by the control circuit B3, a control circuit B3 such as an oscillating circuit (not shown) or a microcomputer that performs interrupt input to the microcomputer based on a constant, a sensor circuit B4 for detecting heat due to a fire based on the temperature characteristics of the thermistor, and the like. And a fire output circuit B1 for switching between the terminals CI and LI into a low-impedance substantially short-circuit state and for turning on a not-shown confirmation lamp. Further, the input side of the signal line 3 is connected to perform an inspection operation. A test signal receiving circuit B6 for detecting the input of a test voltage from a terminal LI to be connected, and a terminal LI to a terminal LO to which the output side of the signal line 3 is connected. A voltage suppression circuit B7 for constantly suppressing the output of the test voltage and outputting the test voltage after the end of the self-check, and a sensor circuit B4 performs a test operation based on the control of the control circuit B3 during the check operation. Test circuit B
And 5.

Next, in the inspection operation by the control circuit B3 when using a thermistor, in order to form a pseudo high temperature state, for example, by connecting a resistor in parallel to the thermistor in the sensor circuit B4, the inspection operation is pseudo high. A temperature condition can be detected. Then, based on the result, the control circuit B3 determines that a fire has occurred, turns on the fire output circuit B1, performs a switching operation between the terminals CI and LI, and simultaneously turns on a confirmation light using a light emitting diode. This switching operation is performed at a predetermined timing in accordance with the above-described inspection operation of the system, and a normal power supply voltage is output during the inspection. As described above, it is possible to artificially detect a high temperature based on the inspection input, and the inspection operation can be easily performed. At this time, the inspection result is stored in a built-in storage means not shown in detail such as a microcomputer.

After this check output, the control circuit B3 performs a forward operation in which a test voltage can be input from the receiving section to the next sensor. At this time, the voltage is suppressed by the voltage suppression circuit B7. Output to stop the operation. As a result, the test voltage of the check input input to the terminal LI flows to the next sensor via the terminal LO, and the next sensor performs the check operation in the same manner as described above. After this operation, the control circuit B3 performs the normal operation of monitoring the fire while monitoring the voltage at the terminal LI and the output of the test signal receiving circuit B6. When the voltage suppression is always effective, when the voltage input to the terminal LI becomes the power supply voltage after the completion of all the inspection operations, the control circuit B3
Stops the output to the voltage suppression circuit B7 to make the voltage suppression effective. It is sufficient that the voltage suppression is effective during the self-check.

FIGS. 7 and 8 show actual circuit examples of the test signal receiving circuit B6 and the voltage suppressing circuit B7.

In the test signal receiving circuit B6 of FIG. 7, a Zener diode Z1 having a Zener voltage of, for example, 18 V between the power supply voltage and the test voltage is provided, and a potential obtained by adding about 0.6 V to the Zener voltage is input. Then, the normally-off transistors Q4 and Q5 are turned on, and a signal is input to the control circuit B3 via a voltage conversion buffer (not shown). The control circuit B3 starts its own inspection operation in response to the input of this signal.

In the voltage suppression circuit B7 of FIG. 8, the transistor Q2 is always on, and the terminal LI is supplied with almost the same voltage (power supply voltage) from the terminal LI. The control circuit B3 which has detected the input from the test signal receiving circuit B6 turns off the transistor Q3, which always maintains the base voltage of the transistor Q2, because the test voltage is also input to the next sensor as it is. To turn off the transistor Q2. Thereby, the transistor Q1
And the Zener diode Z2 perform voltage suppression, and a Zener voltage of the Zener diode Z2, for example, a constant voltage about 0.6V lower than 13V is output to the terminal LO, and the power supply voltage is almost supplied to the next sensor. . Of course, by selecting the Zener voltage of the Zener diodes Z1 and Z2, the test signal receiving circuit of the next sensor from the terminal LO is not operated. Then, at the end of the inspection, the control circuit B3 turns on the transistor Q2 again, releases the voltage suppression circuit B7, and inputs the test voltage from the terminal LO to the terminal LI of the next sensor. The transistor Q2 of this voltage suppression circuit B7
Is about 0.2 V, but if the maximum number of connections is set to about 10, a sufficient power supply voltage can be maintained for the sensor at the farthest end.

Although the thermistor-type heat sensor as a specific example of the fire detector 4 used in the system of FIG. 1 has been described above, other types, such as a photoelectric smoke sensor and a flame sensor, are used. At that time, it is necessary to provide necessary circuits for this system.

FIG. 9 is a simplified block circuit diagram of the checker 12 used in the system of FIG. 1 and the line switch 6 to which the checker 12 is connected.

The entire inspection device 12 is controlled by a control circuit B16 using a microcomputer or the like, and a power supply voltage or a test voltage is applied to each sensor 4 from the line line 3 via a terminal L connected to a voltage limiting circuit B17. An oscillating circuit B18 that is supplied and performs pulse transmission under the control of the control circuit B16 is provided. Further, a switch circuit B21 such as a transistor for giving a pseudo-terminating resistance potential to the signal lines 2 and 3 of the fire receiver 1 via the terminal LP by the resistor Rp via the terminal LP, and a line switching operation to the line switch 6 via the terminal ST. And a switch circuit B22 including a transistor or the like for giving an inspection start input to the fire receiver 1;
A display operation unit B23 including various switches and indicator lights connected to the control circuit B16, and a storage battery serving as a power supply for each of the detectors 4 and the checker 12 connected to the signal lines 2 and 3 via the voltage limiting circuit B17. Power supply B24
Is provided.

The line switch 6 is a checker 12 which is input to the fire receiver 1 via the terminal STt and the terminal ST.
The terminal LO to each sensor 4 which is composed of a relay unit B25 which detects the inspection start input from the terminal and switches the contacts r1 and r2 from b to a, respectively, and is always connected to the terminal LI to the fire receiver 1, By switching the contact r1 from b to a, the contact r1 is connected to the terminal Lt to the inspection device 12, and at the same time, the terminal LI to the fire receiver 1 is connected from the contact r2 b to a
Is switched to the terminal LPt to the inspection device 12. In addition, the terminal CI to the terminal CO connected to the common line 2 and the terminal Ct from the inspection device 12 are also always in a connected state.

Regarding the operation of the inspection device 12, an outdoor inspection mode of the whole system will be described with reference to an image diagram of the display operation unit B23 in FIG. As shown in FIG. 1, after connecting the inspection device 12 to the connector 11 from outside,
The power switch S1 of the display operation unit B23 is operated. Then, the control circuit B16 of the checker 12 outputs an operation output to the switch circuits B21 and B22 to operate the relay unit B25 of the line switching device 6 via the terminal ST by the power supply of the fire receiver 1 and the fire. Receiver 1
To the inspection start input. By the operation of the relay unit B25, the signal lines 2 and 3 from each sensor 4 are switched from the fire receiver 1 to the inspection device 12, and the signal lines 2 and 3 of the fire receiver 1 are connected to the resistance of the inspection device 12. The impedance due to the terminating resistance is given by Rp, and the fire receiver 1 is not displayed as a broken wire.

In this state, when the inspection start switch S2 of the display operation section B23 is operated, the inspection operation in the outdoor inspection mode is started. However, the mode can be sequentially selected by operating the selection switch S4. is there. The mode is displayed by the mode indicators L17 to L19. Then, the inspection start switch S is set in the outdoor inspection mode.
When the user operates No. 2, the inspection lamp L14 is turned on, and the inspection operation in the outdoor inspection mode is started under the control of the control circuit B16.

First, the number n is set to 1, and the voltage limiting circuit B17 for supplying the power supply voltage is operated to start supplying a test voltage to the terminal L as a check input. After confirming the state of the terminal L, the output of the pulse A and the interval TW after the standby of the time 1 which is the timing of the interval TW3 shown in FIG.
After waiting at time 2 which is the timing 1, the pulse B is output, and the presence or absence of the inspection result is detected by AD-converting the voltage between the terminals L and C into the control circuit B 16. If there is an inspection result based on the presence or absence of the inspection result signal, it is determined that the n-th sensor is normal, the indicator lights L1 to L10 corresponding to the number n are turned on, and the inspection result is not shown in the control circuit B16. And outputs the pulse C while waiting for a time 3 which is the timing of the interval TW2. Then, the number n is incremented by 1, and it is confirmed that the number n does not exceed 10, and the above operation is repeated.

By repeating the above operation, each sensor 4 connected to the signal lines 2 and 3 can be made to perform an inspection operation sequentially. In this embodiment, until the operation of the rear-end sensor is completed. It is sufficient to set an inspection time for ten pieces, and by setting a timer, the inspection operation is terminated and a normal termination operation is performed. This normal end operation is performed by blinking the corresponding one of the indicator lights L1 to L10 and lighting the abnormal end light L12 when there is a number for which no inspection signal is obtained from the stored inspection results, and normal when there is no abnormality. The end light L11 is turned on. Then, the output to the voltage limiting circuit B17 is stopped to stop the supply of the test voltage to the terminal L, the inspection operation is completed, and the inspection lamp L14 is turned off. As a result, the indicator lamps L1 to L10 of the display operation unit B18
Thus, it can be recognized that the lit number is normal and the blinking number is abnormal. When performing an inspection, when the control circuit B16 detects that the voltage between the terminals L and C is not normal, the abnormal interruption light L1 is output.
3 is turned on, and the process ends. Similarly, when the result of incrementing the number n by 1 becomes 10 or more, the process is also abnormally terminated. Since the upper limit of the number of sensors that can be inspected is 10, when the eleventh sensor is present, it is regarded as abnormal. The number that can be checked is
Optional. Further, when the detector that has not performed the inspection operation detects a fire, the voltage between the terminals L and C is substantially short-circuited, and the potential of the terminal L continuously decreases. In that case, the checker 12 determines that the fire has ended and the switch circuit B21,
B22 is turned off, and as a result, the fire signal can be detected in the fire receiver 1.

The inspection operation in the outdoor inspection mode is performed by the above operation, but the mode can be sequentially selected by operating the selection switch S4. The operation steps in each mode are the same as those in the outdoor inspection mode. The only difference between the modes is the length of time. Time 1 is the interval TW3 (FIG. 3) common to each mode, and time 2 is the interval TW3 in the outdoor inspection mode.
1 (FIG. 3), the interval TW4 (FIG. 4) in the sensor identification mode and the sensor designation mode, and the time 3 is designated as the interval TW2 (FIG. 3) in the outdoor inspection mode, the sensor identification mode and the sensor designation mode. In the case of a sensor, the interval TW5 (FIG. 4),
In the case of a sensor not specified in the sensor specification mode, the interval T
W6 (FIG. 5).

In the above embodiment, the inspection operation of each sensor 4 is performed in accordance with the pulse of the inspection device 12 and the inspection signal is transmitted. The same operation may be performed at a certain timing. In that case, the inspection device 12 only needs to sequentially receive the inspection signal. However, the inspection signal of the inspection device 12 can be surely detected by making each sensor 4 respond to the pulse. Further, the inspection device 12 may be formed integrally with the fire receiver 1, and the connector 11 may be pulled out from the fire receiver 1 or through the outdoor indicator 10.

Next, a second embodiment of the present invention will be described. In the second embodiment, a configuration diagram schematically showing a system is the same as that of the first embodiment, and a description thereof will be omitted.

FIG. 11 shows an output between the terminals C and L of the checker 12 to the signal lines 3 and 4 in the outdoor check mode when n fire detectors 4 are connected according to the second embodiment, and each fire. Input between terminal CI and LI of sensor 4 and checker 12
Is a waveform detected between the terminals C and L. Inspection device 12
From the power supply voltage (here 24 V) as a check input from the terminals C and L to the signal lines 3 and 4 and the test voltage (here 12
V), pulses A, B, and C from the test voltage to the power supply voltage are output at the same timing as in FIG. 3 of the first embodiment, for example, with a width of 5 ms.

A voltage is maintained between the terminals LI and LO of each fire detector 4 so as not to drop from the power supply voltage, as described later. The first sensor in the waveform of FIG. When a voltage is applied, a control circuit such as a built-in microcomputer rises, and an inspection operation starts when the pulse A1 falls. In this inspection operation, when the detector is a photoelectric smoke detector, the light emission usually occurs at intervals of about 3 seconds.
Although fire is detected by two consecutive detections, quick charge is performed, and inspection is performed by one detection based on light emission of the inspection light emitting diode. In the case of a thermistor type heat sensor, inspection is performed by connecting, for example, a fixed resistor to the thermistor in parallel. Furthermore, even in a heat sensor using a bimetal or an air chamber, the contact mechanism performs a closing operation, and inspection is performed by a pseudo input method. Here, the interval TW1 between the pulse A and the pulse B is a time sufficient for each fire detector 4 to perform an inspection operation, for example, 0.5 seconds, as in FIG.

If the first sensor is normal based on the inspection result, it switches between the terminals CI and LI for a predetermined time from the fall of the pulse B1. The waveform of the signal appears as a fire detection voltage at the time of switching in the input waveform between the terminals CO and LO of the inspection device 12 in FIG. The interval TW2 between the pulse B and the pulse C is the same as in FIG.
Any time can be used as long as it can be detected as a check signal for checking the operation of the checker 12, for example, 20 mS. And
When the rising edge of the pulse C1 in FIG.
The voltage maintenance between the LOs is released, and as a result, after the transmission of the pulse C1, the test voltage is applied to the terminal LI of the second sensor as a check input, and the built-in microcomputer starts up.
The interval TW3 between the pulse C and the next pulse A is, for example, 30 mS, as in FIG.

The inspection operation in the outdoor inspection mode as described above is performed. However, as in the first embodiment, the modes can be sequentially selected.
Only the length of time.

As described above, in the second embodiment, the potentials of the power supply voltage and the test voltage in the first embodiment are used in reverse, and the power supply voltage and the test voltage are the input / output waveforms. Either may be higher as long as the operation of the fire detector is possible and the two can be distinguished. In addition, in the normal switching operation, the signal lines are often substantially short-circuited, but may be the same as the power supply voltage as in the first embodiment. May be applied. That is, if a voltage other than the voltage output from the receiving unit can be detected, the inspection result can be identified as the receiving unit, and in the first and second embodiments, the pulse output from the receiving unit can be identified. The inspection result can be detected even at a potential other than the timing.

FIG. 12 is a schematic circuit diagram of a fire detector 41 used in the system of the second embodiment.

The fire detector 41 uses the terminals CI and LI to which the power / signal lines 2 and 3 are connected as power sources, respectively, and supplies a constant voltage circuit B2, a control circuit B3, a sensor circuit B4, and a fire output circuit B1. , And a test circuit B5 are the same as in the first embodiment, and include a test signal reception power supply switching circuit B9 instead of the test signal reception circuit B6 and the voltage suppression circuit B7.

Next, when a test voltage is supplied to the terminal LI, the test signal receiving power supply switching circuit B9 detects the potential, performs an inspection input to the control circuit B3, and outputs the test signal receiving power supply switching circuit B9. Output from the terminal LO to suppress the voltage (maintain)
I do. As a result, to the terminal LI of the lower fire detector,
The power supply voltage is continued, and only the fire detector that has received the test voltage can perform the test operation. As this capacitor, a capacitor which is sufficient as a power source for the lower signal line 3 is selected, but its capacity is not so required, and it is sufficient as long as it can cover its own inspection operation.

After the check output, the control circuit B3
A forward operation is performed in which a test voltage can be input to the next sensor from the receiving unit side. At this time, an output for stopping the voltage suppression operation is performed to the test voltage reception power supply switching circuit B9. As a result, the test voltage of the check input input to the terminal LI flows to the next sensor via the terminal LO, and the next sensor performs the check operation in the same manner as described above. After this operation, the control circuit B3 performs the normal operation of monitoring the fire while monitoring the voltage at the terminal LI and the output of the test signal receiving circuit B6.

As described above, according to the present invention, in a fire alarm in which a plurality of fire detectors are connected to a signal line from a receiver such as a fire receiver, the receiver is provided for each fire detector. Normally, the power supply voltage is supplied via the signal line, and the fire detector that detects a fire generates a fire signal by switching the signal line to a substantially short-circuit state, etc., and the receiving unit detects the switching operation At the start of the test, the receiving section supplies a test voltage having a potential different from the power supply voltage to the signal line, and each fire detector receives the test voltage from the upper level. In addition to the suppression means that supplies the power supply voltage to the lower fire sensor when the test voltage is detected, the test operation is performed when the test voltage is detected, and then the suppression means is released and the test voltage is output to the lower fire sensor. Characterized by It is intended.

Therefore, even if the fire detector detects the test voltage, it supplies the power supply voltage to the lower order and supplies the test voltage to the lower order after the test operation, so that the fire detectors in order from the upper fire detector one by one. The test operation can be performed, and the test can be individually performed without causing the other fire detectors to perform the fire detection operation without using a transmission signal or a separate inspection line.

Further, a line switch is disposed between the signal line receiving section and each fire detector, and a checker is connected to the line switch at the time of inspection, and the line switch is connected to each fire detector. The signal line is disconnected from the receiving unit and connected to an inspection device. The inspection device can supply a power supply voltage to the signal line and output a test voltage.

Thus, even if the fire receiver as a receiving unit does not have an inspection function, it is possible to cause each fire detector to perform a test operation by using an inspector, and to connect the connector of the line switcher to the outside. The fire alarm can be inspected from outside even if the fire alarm itself is in the house.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a system according to a first embodiment.

FIG. 2 is a signal waveform diagram in an outdoor inspection mode according to the first embodiment.

FIG. 3 is a signal waveform diagram showing the timing of the pulse shown in FIG. 2;

FIG. 4 is a signal waveform diagram showing the timing of a pulse in a sensor specific mode.

FIG. 5 is a signal waveform diagram showing pulse timings in a sensor designation mode.

FIG. 6 is a block circuit diagram schematically illustrating the fire detector of FIG. 1;

FIG. 7 is a specific circuit diagram of the test signal receiving circuit of FIG. 6;

FIG. 8 is a specific circuit diagram of the voltage suppression circuit of FIG. 6;

FIG. 9 is a block circuit diagram schematically showing the inspection device and the line switch of FIG. 1;

FIG. 10 is an image diagram schematically showing the display operation unit of FIG. 9;

FIG. 11 is a signal waveform diagram in an outdoor inspection mode according to the second embodiment.

FIG. 12 is a block circuit diagram schematically illustrating a fire detector according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire receiver 2, 3 Signal line 4 Fire detector 12 Inspection device B6 Test signal receiving circuit B7 Voltage suppression circuit B9 Test signal receiving power supply switching circuit

Claims (2)

[Claims] 1. A fire alarm in which a plurality of fire detectors are connected to a signal line from a reception unit such as a fire receiver, wherein the reception unit is always connected to the signal line for each of the fire detectors. The fire detector that detects a fire by supplying a power supply voltage through the switch generates a fire signal by performing a switching operation on the signal line, and the receiving unit detects the switching operation and performs a fire notification operation. The receiving unit supplies a test voltage having a potential different from the power supply voltage to the signal line at the start of a test, and the fire detector receives the test voltage from a higher order. And a suppression unit for supplying a power supply voltage to a lower-level fire detector, and each of the fire detectors performs a test operation when detecting the test voltage, and releases the suppression unit after the test operation. Above fire A fire alarm which outputs a test voltage to a detector. 2. A line switch is disposed between a signal line receiving section and each of the fire detectors. An inspection device is connected to the line switch at the time of inspection, and the line switch is connected to each of the fire detectors. 2. The fire according to claim 1, wherein the signal line to the tester is disconnected from the receiver and connected to the checker, and the checker can supply a power supply voltage to the signal line and output a test voltage. Alarm.