JP3343689B2 - fire alarm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm capable of remotely testing 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. In addition, since a test in which heat or smoke is applied directly takes time and pollutes the detector, 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, when there is a manager of a dwelling unit, it is possible to enter the dwelling unit by requesting attendance, but it is troublesome.

[0004] In general, even a fire alarm checker cannot easily perform inspection work because it is not preferable to put another person in the dwelling unit.

[0005]

In view of the above, in the present invention, a fire receiver and a plurality of fire detectors connected to the fire receiver via a pair of signal lines are provided in the dwelling unit. In a fire alarm, a plurality of fire detectors have a switching circuit for transmitting a fire signal to a fire receiver, and further, a test circuit is provided, and a test device is provided outside the dwelling unit and connected to a signal line. Performs a test input to specify one of the plurality of fire detectors via a signal line to operate a test circuit, and based on the test input, the test circuit operates a switching circuit to generate a fire signal on the signal line. It is characterized by the following.

The test apparatus is an input terminal for connecting a signal transmission circuit for transmitting a signal for specifying the fire detector from outside the house via a signal line, or a device having a signal transmission circuit. Further, the signals specifying the fire detector are different frequency signals or code signals. Furthermore, the test apparatus outside the house has an outdoor indicator, an indicator light for displaying a fire signal generated based on the test input outside the house, or an alarm for alarming outside the house. Still further, the fire detector is self-healing.

[0007]

According to the present invention, a signal for specifying a fire detector is transmitted from a signal transmission circuit in a test device outside a dwelling unit to a signal line from a fire receiver, and a test circuit of the specified fire detector operates. The inspector can perform test input from outside the dwelling unit, and does not need to enter the dwelling unit every time.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a fire alarm system using the present invention. In dwelling unit H, fire detector RE
The heat detector DH and the smoke detector DS provided in each room are connected to the signal lines C and L, which are the detector electric paths, and the signal lines C and L are located outside the dwelling unit H, for example, on the entrance. It is connected to a line confirmation switch SW of the provided outdoor indicator LX. Each of the sensors DH and DS has an adapter AD that is connected to a sensor electric circuit similarly to the sensor, but is detachably attached to the sensor housing (not shown). In addition, a signal transmission circuit TR is provided in the outdoor display LX, and is connected to the signal lines C and L. In addition to the signal lines C and L, an electric circuit X for the indicator is wired from the fire receiver RE to the outdoor indicator LX, and the operation of the fire receiver RE causes the lighting of the fire indicator light DP and the sounding of the alarm BZ. Done. Therefore, the electric circuit X is composed of a plurality of conductors including a power supply line, an acoustic line, and a display line.

A signal transmission circuit TR in an outdoor display LX as a test device is connected to signal lines C and L as shown in FIGS. 2 and 3, and connects one of a plurality of sensors DH and DS. As a signal to be specified, a signal having a frequency corresponding to each adapter AD can be transmitted. That is, 8 is a relay connected to the transistor 9 and the standby switch 10. Reference numeral 11 denotes a rotary switch for selecting a frequency, the movable contact of which is via a switch 12 for transmitting. The fixed contacts are connected to the vibrating parts VB1 to VBn.

Each vibrating part VB is provided with a tuning fork 14 as a vibrator.
, An analog switch 15 connected to a fixed contact of the rotary switch 11, and a light emitting diode 16 for displaying a transmission frequency.

An oscillating circuit 18, a transistor 19, a capacitor 20 and the like constitute a common oscillating portion of the vibrating portion VB, and are connected to signal lines C and L via make contacts 81 and 82 of the relay 8.

A terminal of the timer 24 is connected to a base electrode of the transistor 9 via a resistor 25, and a reset input is performed by a break contact of the switch 12.

The photocoupler 26 is for detecting the operation of the sensor, and its output is connected to the base electrode of the transistor 29.

The transmission lamp 31 and the stop lamp 32 are connected to a power source by a switching contact 83 of the relay 8.

FIG. 4 shows an embodiment of a smoke detector DS as a fire detector having a test terminal. Smoke detector DS
Is controlled by the pulse generation circuit 34 and the light emitting element 33
Is a so-called scattered light type smoke detector in which light is pulsed by a light emission drive circuit 35 and scattered light generated by smoke is received by a light receiving element 36.

The output of the light receiving element 36 is amplified by an amplifier circuit 37, and a predetermined output is detected by a threshold value detection circuit 38.
The output of the threshold detection circuit 38 is input to the AND circuit 39 together with the output of the pulse generation circuit 34 in order to prevent malfunction, and the switching circuit 41 in the subsequent stage is operated only when the output synchronized by the redundant circuit 40 is repeated a plurality of times. I try to make it.

The test terminal T of the sensor is connected between the amplifier circuit 37 and the threshold value detection circuit 38, and is connected in parallel with the series circuit of the resistors 42 and 43 provided between the output of the amplifier circuit 37 and the terminal C and the resistor 43. A test circuit is configured with the capacitor 44 thus set, and when a predetermined voltage is applied to the terminal T, the threshold detection circuit 38 operates. Reference numeral 45 denotes a non-polarizing circuit using a diode bridge, and reference numeral 46 denotes a constant voltage circuit including a transistor and a Zener diode, and is connected to the signal lines C and L.

The adapter AD includes a tuning fork 47 for tuning to a specific frequency, a tuning circuit 48, a switching circuit 51 including transistors 49 and 50, and a test terminal T, as shown in FIG. The switching circuit 51 operates by the low output of the tuning circuit 48, and a constant voltage is applied to the test terminal T which is the output terminal. The adapter AD is also provided with a non-polarizing circuit 52 and a constant voltage circuit 53 similar to the detector.

Hereinafter, the test operation of the fire alarm according to the present invention will be described. In order to perform the remote inspection in the present embodiment, the adapter AD attached to each of the sensors DH and DS is required.
In this case, it is set so that a test voltage is generated when a signal having a different frequency is received.

In response to the outdoor indicator LX installed outside the dwelling unit H, the inspector inputs the switch 1 of the signal transmission circuit TR from outside.
When 0 is closed, the transistor 9 is turned on and the relay 8 is operated, and its contacts 81 and 82 are closed to enter the standby state. When the switch 12 is closed, the timer 24
Becomes high level, the timer 24 starts, and the analog switch 15 closes.

Then, the tuning fork 14 is connected to the oscillation circuit 18, and a signal having a specific frequency determined by the tuning fork 14 is applied to the contact 81,
The signal is transmitted between the signal lines C and L, which are the electric circuits of the sensor, via 82. Of the plurality of adapters connected in parallel, the adapter of the sensor having the tuning fork 47 that resonates with this signal operates.

That is, the tuning fork 47 resonates, the tuning circuit 48 operates, and further the switching circuit 51 operates, so that a test voltage is applied to the resistor 43 of the smoke detector DS via the test terminal T. At this time, if the sensor is normal, the threshold detection circuit 38 operates, and the AND circuit 39 and the redundant circuit 40
And the switching circuit 41 operates to send a fire signal to the fire receiver RE.

Although not shown in the fire receiver RE,
Turns on the fire bell and turns on the fire lamp, and the electric circuit X for the indicator
, The fire indicator DP is turned on and the alarm BZ is sounded, so that an outdoor inspector can confirm the operation of the detector.

As is clear from the above operation, the inspector
The results of tests that specify sensors from the outside can be checked outdoors, and there is no need to enter the dwelling unit.

On the other hand, in the signal transmission circuit TR, the operation of the fire detector DS is detected by the photocoupler 26 and turned off. This turns off the transistor 29, stops the timer 24, stops the operation of the transistor 9 and the relay 8, and turns on the stop lamp 32. When the switch 12 is opened, the timer 24 is reset.

When the output of the signal transmission circuit TR stops, the application of the test voltage to the smoke detector DS also stops, and the smoke detector DS self-recovers. Here, a general smoke detector uses a so-called self-holding type which has a self-holding circuit, continues switching when a fire occurs, and does not recover without a recovery operation of the receiver. However, in the present invention, a self-recovery type is suitable. Otherwise, an adapter may also be provided on the fire receiver RE side so that a recovery input from the outdoor indicator LX to the receiver or a self-holding type can be used.

When the operated smoke detector DS recovers, the transistor 29 of the signal transmission circuit TR is turned on, and again enters the standby state as described above. Rotary switch 1
Move one movable contact to the next fixed contact and test the next sensor. In the same manner, the test is sequentially performed for the number of connected sensors.

During the test, if there is a faulty sensor, even if a test voltage is applied to the test terminal T, the sensor will not operate.
Since the fire receiver RE and the outdoor indicator LX do not operate, it can be recognized that the sensor is out of order.

In the above embodiment, the adapter AD is detachably attached to the sensor housing. However, the adapter AD may be provided integrally with the circuit of the sensor. Other methods may be used. Also, various methods can be used for an ionization type smoke detector and a heat detector.

The outdoor indicator LX performs the operation of the alarm BZ and the indicator light DP by the signal from the fire receiver RE through the indicator circuit X, but the code signal is shared between the signal lines C and L. And the alarm BZ may be stopped at the time of the test. Regarding the method of specifying the sensor of the signal transmission circuit TR, the adapter AD may be operated by another method such as using a code signal.

The outdoor indicator LX may be provided with only a connection terminal, and an inspector may bring a tester having the same configuration as that of the signal transmission circuit TR to connect and test.

Further, the fire receiver RE does not necessarily need to be a receiver as in the case of a high-rise apartment building, and may be a relay for detecting the operation of a sensor connected to a sensor circuit. Therefore, a building general monitoring panel or the like may be connected to the primary side of the fire receiver RE.

[0033]

As described above, according to the present invention, in a dwelling unit,
In a fire alarm provided with a fire receiver and a plurality of fire detectors connected to the fire receiver via a pair of signal lines, a plurality of fire detectors are provided for transmitting a fire signal to the fire receiver. And a test circuit provided outside the dwelling unit, and a test device connected to a signal line operates the test circuit by identifying one of the plurality of fire detectors via the signal line. Test input,
The test circuit operates the switching circuit based on the test input to generate a fire signal on the signal line, and the inspector can perform the test input from outside the dwelling unit, and does not need to enter the dwelling unit each time.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a system utilizing the present invention.

FIG. 2 is an electric circuit diagram showing a signal transmission circuit utilizing the present invention, together with FIG.

FIG. 3 is an electric circuit diagram showing a signal transmission circuit using the present invention, together with FIG. 2;

FIG. 4 is an electrical circuit diagram illustrating a smoke detector utilizing the present invention.

FIG. 5 is an electric circuit diagram showing an adapter using the present invention.

[Explanation of symbols]

 AD Adapter DS Smoke Detector (Fire Detector) LX Outdoor Indicator TR Signal Transmission Circuit (Input Means) C, L Detector Circuit

Claims (5)

(57) [Claims] 1. A fire alarm provided in a dwelling unit with a fire receiver and a plurality of fire detectors connected to the fire receiver via a pair of signal lines, wherein the plurality of fire detectors include: With a switching circuit for sending a fire signal to the fire receiver,
Further, a test circuit is provided, and a test apparatus which faces outside the dwelling unit and is connected to the signal line specifies a one of the plurality of fire detectors via the signal line to operate the test circuit. A fire alarm, wherein the test circuit operates the switching circuit based on the test input to generate a fire signal on the signal line. 2. The test device according to claim 1, wherein the test device is a signal transmission circuit for transmitting a signal specifying the fire detector from outside the dwelling unit via a signal line, or an input terminal for connecting a device having the signal transmission circuit. Item 1. Fire alarm. 3. The fire alarm according to claim 2, wherein the signals specifying the fire detector are different frequency signals or code signals. 4. The test device outside the house is an outdoor indicator, and has an indicator light for displaying a fire signal generated based on a test input outside the house or an alarm for alarming outside the house. Any of the fire alarms. 5. The fire detector is self-healing.
The fire alarm according to any one of the above items 4 to 4.