JP2868232B2 - 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, under the name of “optical wireless fire alarm system”, Japanese Patent Application No. 1-163670 filed on June 29, 2001 by the applicant of the present invention and July 11, 2001 Japanese Patent Application No. 1-177098 filed on Jan. 1 discloses a fire detector for detecting a fire, and a receiver such as a controller for receiving signals from the fire detector and performing various judgments. Is performed by spatial transmission of light or the like. In these patent applications, in the case of performing such a spatial transmission, when testing a fire detector, a test signal is transmitted by a spatial transmission from a remote controller (a portable tester or the like) or a receiving unit. In this figure, a fire sensor is provided to a fire detector to perform a test, and a test result signal is returned from the fire detector by space transmission.

[Problems to be solved by the invention] The present invention is not intended to be limited to this,
In particular, it is an object of the present invention to provide a fire detector with a test device suitable for performing such a test operation as in the above-mentioned patent application.

[Means for Solving the Problems] According to the present invention, an inspection signal that has been subjected to a predetermined modulation from an inspection signal transmitting unit provided in a receiving unit such as a tester or a fire receiver carried by the inspector generates a fire. It is radiated by spatial transmission toward the detector, which allows the operation test to be performed remotely without removing the fire detector from the ceiling surface.

Specifically, according to the present invention, receiving means for receiving and discriminating an inspection signal spatially transmitted by receiving predetermined modulation from an inspection signal transmitting unit, and when the receiving means receives the inspection signal, Timer means that is energized and operates for a predetermined time; test means for performing an operation test while the timer means is operating; an in-test indicator light that lights up while the timer means is operating; Transmitting means for transmitting a signal indicating the state of the test result by the means as a spatial transmission signal; and a fire detector with a test device, comprising:

[Operation] The spatial transmission signal such as the optical signal radiated from the inspection signal transmitting unit is subjected to a predetermined modulation, and the fire detector side determines that the received signal is the inspection signal only when the receiving unit determines that the received signal is the inspection signal. An operation test is performed by urging the timer means for a predetermined time. Thus, a malfunction does not occur due to the influence of noise light of lighting or the like, and a remote operation test of the fire detector can be stably performed.

In addition, since the in-test indicator such as a light emitting diode is turned on during the operation of the timer, the inspector can visually check that the operation test of the sensor is being performed.

[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. When testing the photoelectric smoke detector DET installed on the ceiling, the portable tester TD carried by the inspector is directed to the smoke detector DET, and a test signal is sent from the tester TD to the smoke detector DET. Transmitted as an optical signal to DET.
When the light-receiving element PD ₂ of the smoke detector DET is received test signal, informs the inspector that the light emitting diode L ₂ is duly received test signal by a lit smoke detector DET side.

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, the light emitting diode L _1, light receiving element PD ₁ for receiving light scattered by smoke, the amplifier circuit AM for amplifying the output of the light receiving element PD ₁ is pulsed light by the oscillation circuit OSC
_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, a selective amplifier AM ₂ for selectively amplifying a component near the frequency f ₁ , a detection / smoothing circuit including a diode D ₁ , a capacitor C ₄ and a resistor R ₄ , a comparator CM ₁ and a resistor R ₇ , it includes a diode D ₂ and the capacitor C ₅ and the comparator CM ₂ consisting Metropolitan storage circuit, and the output of the comparator CM ₂ for a predetermined time set by the timer TM RS flip-flop FF.

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 component N by the noise light, therefore, the output of the amplifier circuit AM ₁ exceeds the fire level V _f is rather, does not operate 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.

When the inspector depresses the switch SW of FIG. 3 of the tester TD, power of the battery B is provided to the multivibrator MB is oscillated this, the light emitting diode L transistor predetermined connected in series to the _third frequency f since on and off at _1, light modulated by the predetermined frequency f ₁ is emitted from the light emitting diode L _3. This light is shown in FIG. 1 and FIG. Light receiving element P provided on the outer surface of smoke detector DET
It is received by the D _2.

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 C ₁ is gradually charged,
Voltage across the capacitor down C ₅ rises based on a time constant determined by the resistance value and the capacitance value of the capacitor C ₅ of the resistor R _7. Voltage across the capacitor C ₅ is, the comparator CM ₂ -
When the reference voltage V ₂ or more set in the terminal, the output of the comparator CM ₂ is inverted to the high potential from the low potential, the high potential output is supplied to the S terminal or set input terminal of the RS flip-flop FF Can be This allows RS flip flops
The FF outputs a high potential from its Q terminal and holds the state for a predetermined time set by the timer TM as a time sufficient for performing the operation test. After a lapse of a predetermined time set as a time sufficient for performing the operation test, the timer TM outputs a high potential and supplies it to the R terminal of the RS flip-flop FF, thereby resetting the RS flip-flop FF. 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 light emitting diode L ₁ by the next pulse output of the oscillation circuit OSC 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, the potential as shown in FIG. 4 V is added to _t becomes a value that exceeds the fire level V _t, thereby the transistor Q ₂ is being operated, the switching circuit
The SC operates and outputs an operation signal to the input terminal _Iac of the transmitting means TX. 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.

That high potential output from the Q terminal of the RS flip-flop FF is, during the test so also given to the base of the transistor Q ₂ simultaneously emitting diode L ₂ is illuminated, thereby smoke sensor is in a test state The inspector can know. Once the RS flip-flop FF outputs a high potential from the Q terminal, it keeps that state for a predetermined time.
Longer switch checker if the light emitting diode L ₂ lights
There is no need to press SW, so the inspector does not have to waste holding down the switch of the tester until the test is completed.

Note that, in the above embodiment, the test result good signal from the transmission unit 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 displayed by a test result good signal. Further alternatively, the in and test indicator L ₂ which lights up during the test, it may be changed to flashing from the lighting in the test results good signal. The operator can know that the test result is good by turning on the indicator light for test result determination or by turning on and off the indicator light during test.

Further, 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, it receives the scattered light and the equivalent amount Smoke element PD
Another light source irradiating toward 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.

Furthermore, 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 And when applied to thermal sensors,
For example, the potential at the connection point between the thermistor and the resistor is set to RS
The same can be implemented by changing the output by the 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, the test indicator such as a light emitting diode is turned on during the test, so that the inspector can visually confirm that the operation test of the detector is being performed.

[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, DET ₂ is a test circuit, PD ₂ is a light receiving element, and FF is RS
Flip-flop, TM is a timer, SC switching circuit, TX transmission unit, L ₂ is a light emitting diode (Showing lamp test), it is.

Continuation of the front page (56) References JP-A-63-1332 (JP, A) JP-A-51-129187 (JP, A) JP-A-48-40399 (JP, A) JP-A-2-161600 (JP) , A) Microfilm (JP, U) photographing the contents of the specification and drawings attached to the application for Japanese Utility Model Application No. Sho 53-177751 (Japanese Utility Model Application No. Sho 55-93089)

Claims (1)

(57) [Claims] 1. A receiving means for receiving and discriminating an inspection signal spatially transmitted by receiving a predetermined modulation from an inspection signal transmitting unit, and being activated when the receiving means receives the inspection signal, for a predetermined time. Timer means that operates during the operation of the timer means, a test means for performing an operation test while the timer means is operating, an in-test indicator that lights up while the timer means is operating, and a state of a test result by the test means. And a transmitting means for transmitting a signal indicating the following as a spatial transmission signal.