JP2892389B2 - Fire detector with test equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fire detector with a test device.

[Background of the Invention] For example, Japanese Patent Application No. 1-163670 filed on June 29, 2001 by the applicant of the present invention under the name of "optical wireless fire alarm system", and July 2001 Japanese Patent Application No. 1-177098 filed on November 11 includes a fire detector unit for detecting a fire and a receiving unit such as a controller for receiving signals from the fire detector unit and performing various judgments. In the figure, a signal transmission from the receiving unit to the fire detector unit is omitted by spatial transmission of light or the like in order to omit the signal wiring. In this case, a built-in battery is often used as a power source for the fire detector.

In these patent applications, in the case of performing such a spatial transmission, when a test of a fire detector is performed, a receiver such as the above controller or a separately prepared remote controller (portable It is disclosed that a test signal is supplied to the fire detector unit by spatial transmission from a test device or the like) to perform a test of the fire detector unit. The test result signal is returned from the fire sensor unit to a remote controller (a portable tester or the like) or a controller (receiving unit) by the same spatial transmission.

[Problems to be solved by the invention] The present invention is not intended to be limited to this,
Particularly, in a fire alarm system in which signal transmission is performed by spatial transmission of light or the like as in the above-mentioned patent application, it is intended to provide a fire detector with a test device suitable for performing a test operation of each fire detector. Things.

Generally, when a spatial transmission signal of an optical signal is received, for example, an optical signal spatially transmitted by a light receiving element such as a photodiode that converts light into an electric signal or a receiving unit including an AC amplifier circuit that amplifies the electric signal. Is received, processing such as signal discrimination is performed. However, since it is not clear when the operation test is performed by the inspector, it is necessary that the optical signal receiving means is always operating. For this reason, the current is always consumed in the receiving means,
In particular, when a built-in battery is used as a power supply as in the above-mentioned patent application, there is a major problem in terms of battery life.
Due to the characteristics of the AC amplifier circuit, the higher the speed of the optical signal used, the higher the current consumption tends to be. Accordingly, the higher the accuracy of signal transmission, the more serious the problem of battery life becomes.

[Means for Solving the Problems] Therefore, according to the present invention, the first timer means intermittently determines whether to receive a check signal spatially transmitted by receiving predetermined modulation from the check signal transmitting unit. Receiving means which is operated for a first predetermined time; a receivable indicator which is lit while the receiving means is being operated by the first timer means; and when the receiving means has determined that the inspection signal has been received. Second timer means which is energized and operates for a second predetermined time; and test means for performing an operation test while the second timer means is operating, and outputting a signal indicating a state of a test result. And a fire detector with a test device comprising:

[Operation] For example, an inspection signal transmitting unit provided in a receiving unit such as a tester or a fire receiver carried by an inspector radiates an inspection signal that has undergone predetermined modulation by a spatial transmission signal such as an optical signal. Only when it is determined that the received signal is a check signal, the receiving means on the fire detector side activates the second timer means for a second predetermined time to perform an operation test on the testing means. Let Thereby, the remote operation test of the fire detector can be stably performed without removing the fire detector from the ceiling surface and without being affected by noise light such as lighting.

Also, the receiving means of the spatially transmitted inspection signal is not always in the operating state, and the first means such as a circuit for generating an intermittent pulse is not used.
The receiving means is intermittently set to the operating state only for the first predetermined time by the timer means, so that the power consumption is reduced. In addition, during the operation of the receiving means, the fact that reception is possible is indicated by an indicator light such as an LED, so that the inspector directs an inspection signal to the fire detector in accordance with the operation of the receiving means. Can be sent.

[Example] Hereinafter, a description will be given based on the drawings.

FIG. 1 shows an example of a photoelectric smoke detector as an embodiment of the present invention, and a fire detector with a test device in which a test signal is transmitted from the tester as an optical signal to the photoelectric smoke detector. The vessel is shown conceptually.

Photoelectric smoke sensor DET is installed, for example, a ceiling surface, a light emitting diode L ₂ as receivable indicator lamp, is shown and a light receiving element PD ₂ for receiving a test signal or inspection signal I have. Emitting diode L ₂ as receivable indicator lights, for example, lit at a rate of a few seconds to 1 minute, the inspector that the indicator lamp during lighting is receivable state of the optical signal can know.

In testing the installed photoelectric smoke detector DET to the ceiling surface, the inspection person, while the light emitting diode L ₂ is lit, smoke a tester TD portable that the inspector possessed Container DE
To T, a test signal is sent from the tester TD to the smoke detector DET as an optical signal. When the light-receiving element PD ₂ of the photoelectric smoke sensor DET to receive the test signal while the light emitting diode L ₂ is lit, operation test of該煙sensor is performed.

Fig. 2 shows the internal circuit of the smoke detector DET,
FIG. 3 shows the internal circuit of the tester TD.

In the internal circuit of the smoke detector DET shown in FIG.
ET is a smoke detection circuit part DET ₁ that monitors fire occurrence by smoke detection, and a test circuit part that is activated during testing or inspection
DET ₂

Smoke circuit DET ₁ includes an amplifier circuit AM for amplifying the output of the oscillation circuit OSC light emitting diode L ₁ which is pulsed light by _1, the light receiving element PD ₁ for receiving light scattered by smoke, the light receiving element PD _1
1, includes a switching circuit SC which operates by conduction of the amplifying transistor Q ₁ is connected via the capacitor C ₁ from the output of the circuit AM _1, and the transistor Q _1.

The test circuit section DET ₂ includes the light receiving element PD ₂ and the light receiving element PD ₂
Of the output, selecting the amplifier circuit AM ₂ to selectively amplify the component in the vicinity of frequency f _1, diode D ₁ and capacitor C ₄ and the resistor R ₄
Detection and smoothing circuit composed of a comparator CM ₁ and the resistor R ₇ and diode D ₂ and the storage circuit comprising a capacitor C ₅ and the comparator CM ₂ Prefecture, comparator output of CM ₂ timer TM (second timer means )
And in the RS flip-flop FF holds between set predetermined time, and the oscillation circuit OSC ₂ comprise the photocoupler PC supplies power to the selected amplifier AM ₂ through the light emitting diode L ₂ and intermittently conducting.

Switching means SC and RS flip-flop
The output side of the FF, the transmitting means TX and the light emitting diode L ₄ for transmitting a fire abnormality occurrence signal or test completion signal in the optical signal when the switching circuit SC is operated are shown connected.

The operation in the normal fire monitoring state, when also described with reference to FIG. 4, when the smoke smoke detector DET not entered, the light emitted by the light emitting diode L ₁ is reflected to the smoke detector in the wall since only the noise light caused by is incident on the light receiving element PD _1, the amplifier circuit AM ₁ outputs only the noise light due to component N (FIG. 4), thus the output Figure 4 of the amplifier circuit AM ₁ Never exceed the indicated fire level _Vf
Not operating the switching circuit SC transistor Q ₁ is turned on.

When smoke enters the smoke detector DET, the fourth output S of the amplifier circuit AM ₁ due to scattered light, as shown in FIG. Is added to the output N of noise light, the potential of the point P in FIG. 2 exceeds the fire level V _f, thereby the transistor Q ₁ is to operate the switching circuit SC conducting. Switching circuit SC
Operation signal is applied to the input terminal I _SC transmission means TX.
Transmitting means TX, when receiving the input terminal I _SC the operation signal from only the switching circuit SC, an optical signal representative of the fire abnormality, from the light emitting diode L ₄ to the receiver of the fire receiver or the like (not shown) Send out.

 Next, the operation at the time of inspection will be described.

The oscillation circuit OSC ₂ (first timer means) turns on the photocoupler PC at a rate of several seconds per minute (first predetermined time), and power is supplied to the selective amplification circuit AM ₂ through the light emitting diode L ₂ . Thus, sensor DET together with a receivable state of the optical signal, sensor light emitting diode L ₂ provided on the outer surface is lit, indicating that a receivable state inspector.

After the inspector confirms the lighting of the light emitting diode L _2, a third
When the switch SW of the tester TD shown in the figure is pressed, the power of the battery B is supplied to the multivibrator MB to oscillate it.
A transistor connected in series at a predetermined frequency f ₁ since turning on and off the light emitting diode L _3, light modulated by the predetermined frequency f ₁ is emitted from the light emitting diode L _3. This light is illustrated in FIGS. 1 and 2, is received by the light receiving element PD ₂ which is provided on the outer surface of the smoke detector DET.

Light smoke detector DE which is modulated at a frequency f ₁ from the tester TD
Selective amplifying circuit by being incident on PD ₂
When the input of the frequency f ₁ is applied to the AM _2, the selection amplifier circuit A
M ₂ and outputs selectively amplify input component in the vicinity of the frequency f _1. Selection output from the amplifier circuit AM ₂ is detected and smoothed by detection and smoothing circuit composed of the diode D ₁ and capacitor C ₄ and a resistor R ₄ Prefecture, DC voltage generated across the resistor R ₄ is, comparator
Of CM ₁ - when it comes to have been set reference voltages V ₁ or more terminals, the output of the comparator CM ₁ is inverted from the low potential to a high potential.
Capacitor C ₅ by the output of the comparator CM ₁ is gradually charged, the voltage across the capacitor C ₅ is increased based on the time constant determined by the resistance value and the capacitance value of the capacitor C ₅ of the resistor R ₇ I do. Voltage across the capacitor C ₅ is, the comparator CM ₂ - when it comes to have been set reference voltage V ₂ or more terminals, the output of the comparator CM ₂ is inverted from a low potential to a high potential, the high potential output Is supplied to the S terminal of the RS flip-flop FF, that is, the set input terminal. As a result, the RS flip-flop FF outputs a high potential from its Q terminal and holds that state for a second predetermined time set by the timer TM as a time sufficient for performing the operation test. After a lapse of a second predetermined time set as a time sufficient for performing the operation test, the timer TM outputs a high potential and the RS flip flop
To the R terminal of the FF, and the RS flip-flop FF
Is reset, and the output from the Q terminal returns to a low potential.

Since the resistor R ₇ diode D ₂ is connected in parallel, when the output of the comparator CM ₁ becomes the low potential charge charged in the capacitor C ₅ is will be rapidly discharged,
Therefore, the output of the comparator CM ₂ is a high potential to continue the output of the comparator CM ₁ is a predetermined time or more to reverse the high potential, that continue to the switch SW of the tester TD certain period of time It is necessary to press.

RS high potential output from the Q terminal of the flip-flop FF is divided by the resistors R ₃ and R _2, is raised to the potentials of both the resistance of the connection point t V _t (Figure 4). When the next light-emitting diodes L ₁ by the pulse output of the oscillation circuit OSC ₁ is lit, the noise component output N of the amplifier circuit AM ₁ due to the noise light generated by the reflection of the smoke detector in the wall surface, as shown in FIG. 4 potential is added to V _t becomes a value that exceeds the fire level V _f, thereby the transistor Q ₁ is actuated, the switching circuit
SC outputs an operation signal to the input terminal I _SC sending means TX work. The other input terminal I _FF transmitting means TX, RS flip-flop has a high potential output is supplied from the FF, the transmitting means TX is a signal on both of these input terminals I _SC and I _FF receiving the, from the light emitting diode L _4, and sends the test results good signal to the receiving unit and the tester and the like of the fire receiver or the like (not shown) in the optical signal. This allows the inspector to know that the operation test has been successfully performed.

Incidentally, in the above embodiment, also connected to the Q terminal of the RS flip-flop FF to the oscillation circuit OSC _2, intermittently on oscillator OSC ₂ is a photocoupler PC when subjected to high voltage output from the Q terminal it may be caused to blink the light emitting diode L ₂ by off. In this way, the inspector can
You can know that the smoke detector has entered the test state.
When the RS flip-flop FF is temporarily outputs the high potential from the Q terminal, so during the second predetermined time set by the timer TM maintains its state checker if Kaware flashing light emitting diode L ₂ from the lighting Does not need to press the switch SW of the tester TD anymore, so that the inspector does not waste the time of keeping pressing the switch of the tester TD until the test is completed.

Further, in the above embodiment, the test result good signal from the transmission means TX is transmitted as an optical signal to the receiving unit or the like, but an indicator light for test result determination is separately provided in the fire detector, This indicator light may be turned on by a test result good signal. The operator can know that the test result was good by turning on the indicator light for test result determination.

Furthermore, in the above embodiment, is carried out operating tests in a way that adds a DC voltage to the noise component output from the amplifier circuit AM _1, light receiving element scattered light equivalent amount Smoke
Another light source for irradiating the PD ₁ may be provided in the smoke detector, and at the time of inspection, the other light source may emit light at the output from the RS flip-flop FF.

In the above embodiment, the case where the present invention is applied to a photoelectric smoke detector has been described.However, when the present invention is applied to an ionization type smoke detector, for example, the potential of the connection point between the inner and outer ion chambers is When the present invention is applied to a thermal sensor, for example, the present invention can be similarly implemented by changing the potential at the connection point between the thermistor and the resistor at the output of the RS flip-flop FF.

[Effects of the Invention] As described above, according to the present invention, the spatial transmission signal such as the light radiated from the inspection signal transmitting unit is subjected to a predetermined modulation, and the fire detector detects that the received signal is the inspection signal. Only when it is determined that the timer is activated, the operation test is performed by energizing the timer means.Therefore, a malfunction does not occur due to the influence of noise light such as lighting, and the remote operation test of the fire detector can be performed. There is an effect that it can be performed stably.

In addition, since the receiving means of the fire detector is operated intermittently only for the first predetermined time, power consumption is reduced, which means that the fire detector has a built-in power supply such as a battery. This is very advantageous when is used.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram for schematically explaining a fire detector with a test device according to one embodiment of the present invention, and FIG. 2 is an internal circuit of the fire sensor with a test device according to one embodiment of the present invention. FIG. 3 is a circuit diagram showing an internal circuit of the tester TD, and FIG. 4 is a waveform diagram for explaining the operation of FIG. In the figure, DET is a fire detector, TD is a tester, DET ₁ is a sensing circuit section, DET ₂ is a test circuit section, OSC ₂ is an oscillation circuit (first timer means), PD ₂ is a light receiving element, and AM ₂ is Selective amplification circuit, FF
The RS flip-flop, TM timer (second timer means), SC switching circuit, TX transmission unit, L ₂ is a light emitting diode (receivable indicator), a.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G08B 29/00

Claims (1)

(57) [Claims] 1. A receiving means which is intermittently operated for a first predetermined time by a first timer means so as to determine whether or not to receive an inspection signal spatially transmitted by receiving predetermined modulation from an inspection signal transmitting unit. A receivable indicator light that is turned on while the receiving means is being operated by the first timer means, and is activated when the receiving means determines to receive the inspection signal and operates for a second predetermined time Second timer means for performing an operation test while the second timer means is operating;
A fire detector with a test device, comprising: a test means for outputting a signal indicating a state of a test result.