JPS6339829Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a display device for fire alarm equipment that has a function of detecting changes in physical phenomena such as heat and smoke caused by a fire by setting a plurality of sensitivity levels.

In conventional fire alarm equipment, the detection sensitivity of fire detectors that detect temperature rise and smoke density due to fire was one, but in recent years, in order to be able to detect fire conditions in more detail, multiple levels have been developed. Fire alarm equipment using a fire detector that sets detection sensitivity and sends out a detection signal at each sensitivity level is also being considered.

By the way, in conventional fire alarm equipment, an alarm indicator light is installed on the fire detector to indicate that the fire detector has detected a fire and issued an alarm. Similarly, an alarm indicator light is provided, so that no matter which detection sensitivity the alarm is triggered, the same alarm indicator light is lit so that the activated sensor can be easily identified from the outside.

However, because the fire detector had only one alarm indicator light, it was difficult to tell which sensitivity the alarm was triggered in, even though it had a multi-sensitivity detection function, and it was difficult to determine whether the alarm was triggered by a false alarm or not. This was inconvenient when checking.

The present invention was developed in view of these conventional problems, and includes a fire sensor unit that detects changes in surrounding physical phenomena caused by a fire at multiple levels of detection sensitivity and outputs a detection signal. In the alarm equipment, the number of indicator lights corresponding to the sensitivity level of the sensor part is provided, and the number of indicator lights lit increases as the change in the physical phenomenon in the sensor part increases, thereby improving the state of fire detection due to multi-sensitivity. It is an object of the present invention to provide a display device for fire alarm equipment having a multi-sensitivity detection function that allows easy identification.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a circuit block diagram showing an embodiment of a fire detector having a multi-sensitivity detection function and equipped with a display device according to the present invention. I'm taking it.

First, to explain the configuration, 1 is an oscillation circuit, and the oscillation output of the oscillation circuit 1 is connected to a light emitting diode 2 via a resistor _R7 , and the light emitting diode 2 is driven by a light emitting pulse to intermittently emit pulsed light. I am trying to output it.

A light emitting diode 3 is connected to the light emitting diode 2 via a smoke detection section that uses a scattered light method, and a light emitting diode 3 is connected to the light emitting diode 2 through a smoke detection section that uses a scattered light method. is made to be incident.

The light reception signal of the light emitting diode 3 is amplified by an operational amplifier 4, differentiated by a differentiating circuit consisting of a capacitor C ₁ and a resistor R ₂ , and then sent to a comparator 5, via a resistor R ₁ .
It is input as a detection voltage to positive input terminals 6 and 7.

Here, since the detection voltage from the operational amplifier 4 is a voltage proportional to the increase in smoke concentration, the detection voltage is set at each of the positive input terminals so that when the detection voltage exceeds the reference voltage, the comparators 5, 6, and 7 produce an H level output. Input the detection voltage to the negative input terminal, and input the reference voltage Vr 1 to Vr ₁ determined by the divided voltage of resistors R ₃ to R ₆ to the negative input terminal.
Vr ₃ (Vr ₁ < Vr ₂ < Vr ₃ ) is input.

That is, the comparator 5 to which the smallest reference voltage Vr ₁ is input performs the first stage of smoke concentration detection (1
The comparator 6, which is set to the next highest reference voltage Vr ₂ , performs the second stage smoke concentration detection (2
The comparator 7 to which the highest reference voltage Vr ₃ is set performs the third stage of smoke concentration detection (3
seeds).

In addition, power is supplied to the comparators 5 to 7 intermittently using oscillation pulses from the oscillation circuit 1.
7 compares and determines the detected voltage every time an oscillation pulse is applied.

Each output of the comparators 5, 6, and 7 is connected to a delay flip-flop (hereinafter referred to as "D-FF") 10,
Input to data terminal D of 11 and 12, D-FF
An oscillation pulse from an oscillation circuit 1 is inputted to each of clock terminals CL 10, 11, and 12 via a delay circuit 8.

The operation of these D-FFs 10, 11, and 12 is performed in synchronization with the oscillation pulse, and if the oscillation pulse is input when the data terminal D has an H level input, the D-FF10, 11, and 12 operate in synchronization with the oscillation pulse.
FF10, 11, 12 are set and Q output is set to H.
level, and after this setting, if an oscillation pulse is input with the data terminal D at L level, D-
FFs 10, 11, and 12 are reset to bring their Q outputs to L level.

Also, the clock terminals of D-FF10, 11, 12
A delay circuit 8 that delays the oscillation pulse supplied to CL for a predetermined period of time is configured to delay the time delay until the comparators 5, 6, and 7 are pulse-driven by the power supply by the oscillation pulse and generate a comparative discrimination output of the detected voltage.
It is provided to synchronize the oscillation pulses, and consists of a time constant circuit consisting of inverters N ₁ and N ₂ , resistors R ₈ and R ₉ , and capacitor C ₂ .

Each output Q of the D-FFs 10, 11, and 12 is connected to one end of resistors _R10 , _R11 , and _R12 via diodes _D1 , _D2 , and _D3 for backflow prevention, respectively, and these resistors _R10 , The other ends of R ₁₁ and R ₁₂ are commonly connected and further connected in series with a resistor R ₁₃ .

The circuit section consisting of these resistors R ₁₀ , R ₁₁ , R ₁₂ , and R ₁₃ is a voltage generation circuit for generating a detection voltage that changes step by step according to the smoke concentration detection outputs of the comparators 5, 6, and 7 in three steps. It makes up the department.

In other words, the voltage generated by the voltage generation circuit section is
It is taken out from the connection point P between R ₁₀ to R ₁₂ and the resistor R ₁₃ and is input to the base of the transistor 13 that operates as an impedance conversion means, and the input voltage at the P point is impedance converted and sent to the receiver as a signal voltage Vs. Send to.

In addition, power supply to each circuit section is provided by constant voltage circuit 1.
A constant voltage +Vcc is supplied from 4.

Here, as the voltage Vs generated by the voltage generation circuit section consisting of resistors _R10 to _R13 , first, the comparator 5
In the first stage smoke concentration detection state that generates a level output, the Q=H level output of D-FF10 supplies the power supply voltage +Vcc to the series circuit of resistors _R10 and _R13 via diode _D1 , and therefore The voltage Vs ₁ at point P outputted via the transistor 13 is given by Vs ₁ =Vcc×R ₁₃ /R ₁₀ +R ₁₃ (1).

Next, in the second stage smoke concentration detection state in which the comparators 5 and 6 produce H level outputs, D-
The Q=H level output of FFs 10 and 11 supplies the power supply voltage +Vcc to the resistor _R13 via the diodes _D1 and _D2 and the resistors _R10 and _R11 , respectively, and the voltage at point P at this time + _Vs2 is Vs ₂ = Vcc×R ₁₃ /R ₁₃ +R ₁₀ R ₁₁ /R ₁₀ +R ₁₁ …(2).

Furthermore, in the third stage smoke concentration detection state in which each of the comparators 5, 6, and 7 produces an H level output, the resistors R ₁₀ , R ₁₁ , and R ₁₂ , the power supply voltage +Vcc is supplied to the resistor _R13 , and the voltage _Vs3 at point P at this time _is : _Vs3 = Vcc × _R13 / _R13 + _R10 R11 _R12 / _{R10 R11} + _R11 R ₁₂ +R ₁₂ R ₁₀
…(3) becomes.

That is, as is clear from the above equations (1) to (3), since Vs ₁ <Vs ₂ <Vs ₃ , the signal voltages Vs ₁ and Vs increase stepwise as the smoke density increases. ₂ and Vs ₃ are sequentially transmitted from the transistor 13 to the receiver side.

On the other hand, the detection voltage of the transistor 13 determined by the voltage at point P is applied to the display control circuit 20 for controlling the lighting of indicator lights L ₁ , L ₂ , and L ₃ provided corresponding to the three detection stages in the sensor section. .

This display control circuit 30 includes a comparator 21,
22, 23, 24, and comparators 21 to 2
The detected voltage generated in the resistor Re by the output from the transistor 13 is connected to the positive input terminal of the comparator 2 through each of the resistors _R25 to _R28 .
Resistors R ₂₀ to R 24 are connected to the negative input terminals 1 to ₂₄ .
The reference voltage obtained from the voltage divider circuit is connected to the input.

Here, the comparator 21 produces an H level output at the first stage detection voltage Vs ₁ , the comparator 22 produces an H level output at the second stage detection voltage Vs ₂ , and the comparator 23 produces an H level output at the second stage detection voltage Vs 2. The reference voltage is determined so that an H level output is generated at the detection voltage Vs ₃ of the comparator 24.
Since the detected voltage never exceeds this reference voltage, the output is always fixed at the L level.

The output of the comparator 21, which produces an H level output at the first stage detection voltage Vs ₁ , is connected via a resistor R ₃₀ to an indicator light L ₁ that displays an alarm based on the first stage detection sensitivity. 22-2
Diodes D ₄ to D ₆ are connected in opposite directions to the output of comparator 22, and the output of comparator 22 is connected to diode D ₄
The output of the comparator 23 is also connected between the indicator lights L ₂ and L ₃ via the diode _D5 , and the output of the comparator 24 is connected between the indicator lights L ₁ and L ₂ . One end of light _L3 is a diode
Connected in-lead via D ₆ .

Indicator lights L ₁ to _{L 3} provided in this display control circuit 20
The sensor part 2 of the fire detector shown in Fig. 2 is
5 is attached to the base 26, and the lighting color of the indicator lights L ₁ to _{L 3} is milky white like the conventional alarm indicator lights, or for each stage, for example, the indicator light L ₁ is Green, indicator light L ₂ is yellow, indicator light L ₃
It is also possible to use a color such as red.

FIG. 3 is an explanatory diagram showing an example of a receiver that receives a fire signal from a fire detector having a multi-sensitivity detection function shown in FIG. A representative indicator light 32 corresponding to the line drawn out for each warning area, a line display section 34 that displays the number of lines connected to the detector that sent out the fire signal, and an operation switch for bell stop, recovery test, etc. An operating section 36 is provided, and an indicator light 38 is further provided to indicate which of the multi-sensitivity detection stages of the fire detector a fire signal has been received.

This indicator light 38 is similar to the indicator lights L1 to _L1 shown in FIG.
As with L ₃ , there are three indicator lights that correspond to three levels of detection sensitivity.

Note that the representative fire light 32 is used not only to indicate a fire but also to indicate a disconnection.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, in the steady monitoring state, the light emitting diode 2
emits light intermittently due to the oscillation pulse from the receiver circuit 1, and when there is no inflow of smoke, no scattered light enters the light receiving diode 3, and the operational amplifier 4
The detected voltage becomes 0 volts, the outputs of comparators 5 to 7 become L level, and transistor 1
3 is in the off state, and the indicator light of the display control circuit 20
_L1 to _L3 are off.

When smoke from a fire flows in in this state, the amount of scattered light received by the light receiving diode 3 increases, and the detection voltage from the operational amplifier 4 also increases in accordance with the increase in smoke concentration.

Therefore, the detection voltage from the operational amplifier 4 gradually exceeds the reference voltages Vr ₁ to Vr 3 of the comparators 5, 6, and ₇ as time passes, and at a timing synchronized with the oscillation pulse from the oscillation circuit 1. Comparators 5, 6, and 7 sequentially produce H level outputs.

Therefore, when the detected voltage first exceeds the reference voltage Vr ₁ of the comparator 5 and generates an H level output,
D-FF in synchronization with the oscillation pulse from oscillation circuit 1
10 is set, and the output Q=H causes a current to flow through the diode D ₁ to the series circuit of resistors R ₁₀ and R ₁₃ , and the detection voltage at point P is the detection voltage Vs ₁ given by the above equation (1). becomes.

This detection voltage Vs ₁ turns on the transistor 13, producing a detection voltage Vs ₁ across the resistor Re of the display control circuit 20, and the detection voltage Vs ₁ is applied to the comparator 2.
Since the voltage exceeds the reference voltage of 1, the comparator 21
produces an H level output, and at this time the comparator 22
Since the output of is at the L level, current flows through the resistor R ₃₀ , the indicator lamp L ₁ , the diode D ₄ and the output of the comparator 22, and the indicator lamp L ₁ lights up due to the first stage detection voltage.

Next, if the detected voltage from the operational amplifier 4 exceeds the reference voltage Vr ₂ of the comparator 6, the outputs of the comparators 5 and 6 become H level in synchronization with the oscillation pulse from the oscillation circuit 1, and the D-FFs 10 and 1
1 is set, and by setting Q=H, the diode
A current flows to the resistor R ₁₃ via D ₁ , D ₂ and resistors R ₁₀ , R ₁₁ , respectively, and the voltage at point P becomes the detection voltage Vs ₂ given by the above equation (2), which turns the transistor 13 on. As a result, a detection voltage Vs ₂ is generated across the resistor Re of the display control circuit 20.

Since this detection voltage Vs ₂ exceeds the reference voltage of the comparator 22, each of the comparators 21 and 22 produces an H level output. Comparator 2
The H level output of 2 will reverse bias the diode D ₄ , and since the output of the comparator 23 is at the L level at this time, the output of the comparator 21 will cause the resistor R ₃₀ , indicator light L ₁ , indicator light L ₂ and diode to be A current flows to the output of the comparator 23 via _D5 , and the indicator light is activated by the second stage detection voltage _Vs2 .
L ₁ and L ₂ light up.

Furthermore, the detection voltage of operational amplifier 4 is detected by comparator 7.
If it exceeds the reference voltage Vr ₃ of the oscillation circuit 1
The outputs of comparators 5 _{to 7} become H level in synchronization with the oscillation pulse _of
Current flows through the resistor _R13 through the parallel circuit of _R12 ,
The voltage at point P is the detection voltage given by equation (3) above.
Vs ₃ , and by turning on the transistor 13, a detection voltage Vs ₃ is generated across the resistor Re of the display control circuit 20.

Since this detection voltage Vs ₃ exceeds the reference voltage of the comparator 23, each output of the comparators 21 to 23 is at the H level, and only the output of the comparator 24 is at the L level.

Therefore, the H level outputs of the comparators 22 and 23 reverse bias the diodes D ₄ and D ₅ , and the output of the comparator 21 connects the resistor R ₃₀ , the indicator light L ₁ ,
A current flows to the output of the comparator 24 via L ₂ , L ₃ and the diode D ₆ , and the third stage detection voltage
Vs ₃ turns on indicator lights L ₁ , L ₂ and L ₃ .

Of course, each of the detection voltages Vs ₁ to Vs ₃ generated at point P is sequentially sent to the receiver 30 shown in FIG. 3 via the signal line by turning on the transistor 13.
The receiver 30 lights up the representative indicator light 32 corresponding to the line of the fire detector that triggered the alarm, displays the line number on the line display section 34, and furthermore, corresponds to the detection voltages Vs ₁ to _{Vs 3} of the fire detector. By determining the signal voltage, the three indicator lights 38 provided near the line display unit 34 are displayed in accordance with the increase in smoke concentration, similar to the indicator lights L ₁ to L ₃ of the display control circuit 20 in FIG. 1. Lighting is displayed so that the number of lights 38 lit is increased.

In fire detectors and receivers of fire alarm equipment with such multi-sensitivity detection functions, the number of indicator lights lit increases as the fire detection stage increases. From the number of lit indicator lights, it can be easily determined which detection stage the fire signal is being received at, for example, the indicator lights L ₁ to L provided on the base 26 of the fire detector shown in FIG. 2. By looking at the lighting status of ₃ , you can know which of the detection sensitivities corresponding to types 1 to 3 the fire detector is triggering a fire detection, for example, the first stage indicator light
When L ₁ is lit, it can be inferred that there is an initial fire; on the other hand, when indicator lights L ₁ and L ₂
When the light is on, it is possible to confirm that an alarm has been issued due to the smoke caused by the fire.

In addition, although the above-mentioned example took as an example the case where the detection sensitivity was set in three stages, the present invention is not limited to this, and can also be applied when the detection sensitivity is set in multiple stages as appropriate. A similar effect can be obtained by increasing the number of indicator lights.

Further, in the above embodiment, a scattered light type smoke detection unit is used as an example of the sensor unit, but the sensor unit may also include an ionization type smoke detection unit, a temperature detection unit, etc. Means for detecting a change in can be used.

Furthermore, in the above embodiment, the stage of detection sensitivity is determined by the signal voltage corresponding to the detection sensitivity of the fire detector, but this detection voltage is converted into a pulse code and sent to the receiver, and the receiver The detection sensitivity may be determined under program control of a microcomputer provided in the sensor, and the display of the detection sensitivity may be controlled using an indicator light.

As explained above, according to the present invention, in a fire alarm system equipped with a sensor section that detects changes in surrounding physical phenomena caused by a fire at multiple levels of detection sensitivity and sends out a fire detection signal, the sensor section The number of indicator lights corresponding to the sensitivity level of the fire detector and/or receiver is installed, and the number of indicator lights lit increases as the change in physical phenomena in the sensor increases. It is easy to tell from the number of lit indicator lights which sensitivity the alarm and fire reception at the receiver are based on, and it is appropriate to judge whether the alarm is caused by a false alarm or a fire when it comes to the alarm display on the fire detector. Regarding the sensitivity display on the receiver, for example, the first stage sensitivity display can be used as a pre-alarm, the second stage sensitivity display can be used to issue fire alarms and evacuation guidance, and the third stage sensitivity display can be used to issue commands for fire alarms and evacuation guidance. It is possible to perform accurate operations such as starting fire extinguishing equipment, and furthermore, the progress of the fire can be accurately grasped by displaying the sensitivity levels on the receiver.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a fire detector equipped with an indicator light according to the invention, and Fig. 3 is a receiver equipped with an indicator light according to the invention. FIG. 1...Oscillation circuit, 2...Light emitting diode, 3...
...Photodetector diode, 4...Operational amplifier, 5, 6,
7, 21, 22, 23, 24... comparator,
8...Delay circuit, 10, 11, 12...D-FF,
13...transistor, 14...constant voltage circuit, 2
0...Display control circuit, 25...Sensor section, 26...
...Base, 30...Receiver, 32...Representative light, 3
4...Line display unit, 36...Operation unit, 38...Indicator light, _L1 , _L2 , _L3 ...Indicator light.

Claims (1)

[Scope of claim for utility model registration] A sensor unit that detects changes in surrounding physical phenomena due to fire at multiple levels of sensitivity and outputs detection signals, and a number corresponding to the sensitivity levels set for the sensor unit. A multi-sensitivity detection function characterized by comprising: an indicator light; and a lighting control circuit that increases the number of lighting indicators of the indicator light based on a detection signal sequentially output by the sensor unit as a change in the physical phenomenon increases. Display device for fire alarm equipment with