JPS5892099A - Fire detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to improvements in fire I6 intelligence.

Conventional fire detection 6 detects the occurrence of a fire by turning on a switching circuit when the output voltage of a sensor whose output voltage changes in response to changes in smoke concentration or temperature becomes above or below a certain value. It's nothing more than that. and,
The self-switching circuit generally uses an element having a self-holding capacity, such as a thyristor.

In the conventional fire detection device 6 described above, in order to check whether the sensor is operating normally or whether the operating setting voltage of the switching circuit is normal, it is necessary to actually let smoke enter the sensor. It is necessary to test by giving rise to , -. There is also a known method of testing operation by applying an isometric voltage without allowing smoke or the like to enter the area, but in either case, it is necessary to go to the location where the sensor is installed, and the test is difficult. The disadvantage is that it is complicated. Also,
Since the fire detection tiF is judged based on a fixed value of the output of the sensor, it is either on or off, and has the disadvantage that it is not possible to know the degree of smoke damage or temperature rise or the state of change. A method of converting the sensor output voltage into a digital value and transmitting it is also known, but the equipment is complicated and expensive.

The purpose of the present invention is to solve the above-mentioned conventional drawbacks, and to detect a fire in which it is possible to confirm the normal operation of a fire detector from a remote location, and to grasp the degree and change status of a concentration, temperature If, etc. The purpose is to provide a sensor.

The fire detection unit 6 of the present invention includes a sensor that outputs a voltage corresponding to smoke concentration, temperature, etc., and a switching circuit that turns on when the output voltage of the sensor is above or below a certain value. - a charging/discharging circuit operated by a power source supplied from - and reset by turning on the switching circuit; and a sensor is connected in series between the output of the photodischarge circuit and the surface thereof, and connected between the Time value.

Furthermore, it is advantageous for information transmission to be provided with a pulse oscillation surface and configured to count the number of pulses within the ON period of the switching circuit.

Next, the present invention will be explained in detail with reference to FIG.

FIG. 1 is a circuit diagram showing -*m tt'll of the present invention. In the same figure, Sen? l#1all [or a sensor that outputs a voltage corresponding to the temperature range, such as an ion type smoke detection sensor, a photodiode that receives scattered light, or a heat-sensitive element. When the output voltage of the sensor 1 exceeds a certain value, the Zener diode 2 becomes conductive and sets the gate terminal of the i-iristor 2 to a high level, turning on the thyristor 2. Call→←←−≠−111−5, the series connection circuit of capacitor C3 and resistor RX is l! In response to the first report, L was hit by a hair pillow and Condan? C, is gradually charged by the voltage applied from the e wire. Also, sensor 1#'11111
' is connected to the can mL and one end of the capacitor C9. That is, the sensor 1 and the capacitor C1 are connected in series, and the charging voltage of the capacitor CI is applied to the negative side of the sensor 1. In this embodiment, capacitor C3 and resistor R
3 constitutes a charge/discharge circuit, and the voltage of the capacitor C1 is the output voltage of the photodischarge circuit. The cand of the thyristor 2 is connected to the alarm -, and the anode is connected to the alarm mL+ via the normally closed contact SI and the relay 8. Also, a normally open contact S is connected in parallel to the capacitor C1. The normally open point S is a contact that closes when the relay 8 is activated. The normally closed contact 81 is a contact that opens when the relay 8 operates. A current detection circuit is provided in place of the relay 8, and the current detection circuit detects the normally closed contact S and the normally open contact S.
The on/off of s may be controlled. In this case, the above contact S
, l S, can be constructed of, for example, a transistor.

Next, the operation of this embodiment will be explained. Alarm #L'
The voltages applied from S and L* photovoltage capacitor C+ through resistor R4, and the terminal voltage of capacitor C1 gradually increases. When the sum of the charging voltage of the capacitor C3 and the output voltage of the sensor 1 exceeds a certain value of 1K, the Zener diode 2 exceeds 4, and the thyristor 2 is triggered. When the thyristor 2 is turned on, the relay 8 is operated and the normally open contact S is turned on and off, so that the photoelectric voltage of the capacitor CI varies in several ranges.

In other words, the photodischarge circuit is set. Then, Zener diode 2 is turned off. - The thyristor 2 is turned off by turning off the 10,000'g closing contact SI, and the relay 8 is also restored. When the relay 8 is restored, the closing contact S1 is turned on, but since the Zener diode 2 is already turned off,
Thyristor 2 remains off - 0 while relay 8
When the normally open contact S is restored, the capacitor C turns off.
At 1, photoelectric current is again started through the resistor R+-, and the above-described operation is repeated. That is, the thyristor 2 is turned on at regular intervals. This cycle changes depending on the output voltage of cell 1 during normal times. For example, sensor 1
9. When the output range pressure is large, the cycle is fast. When the output voltage of sensor 1 is small, the period becomes slow. In severe cases, the sensor 1 may fail and there will be no output, and the Zener diode will no longer conduct, causing the thyristor 2 to no longer turn on. Therefore, the cycle of thyristor 20 on is set to alarm #Lt.
, L* from the other end, it is possible to check for an abnormality in the sensor 1.

Next, when a fire occurs and the output voltage of the sensor 1 changes due to the generation of smoke, for example, the turn-on period of the thyristor 2 changes depending on the extent of the change. If the change in the output voltage of sensor l due to smoke is added to the photoelectric voltage of capacitor C3, the period will be shortened, and if the polarity is subtracted, the period will be lengthened, so for any type of smoke detection visit. can also be applied. The same applies even if the sensor l is a temperature detector.

As understood from the above operation, the relay 8 has some i
! ! It is desirable to have a deferred recovery characteristic. Capacitor C1
This is to ensure the light discharge and turn-off of the thyristor 2. Also, one end of the sensor 1 is connected to the alarm LI
The connection may be made through the normally closed contact S1 instead of being directly connected to the contact point S1. Furthermore, in order to prevent the voltage applied to the sensor l from changing suddenly when the thyristor 2 is turned on, it is desirable to connect a diode D and a capacitor C1 for backflow prevention as shown by the dotted line in the figure. These are appropriately designed depending on the characteristics of the sensor 1 and other conditions.

FIG. 2 shows an example of a specific circuit when the sensor 1 is an ionization type smoke detection device. Since the ionization type smoke sensor has a high impedance output, the intermediate electrode is input to the gate of a field effect transistor FET to convert the impedance, and the ground electrode of the field effect transistor is connected to the Zener diode Z. The drain electrode of the transistor FET is connected to an alarm via a normally closed contact S1 and a relay 8. Also, there is an alarm.

The voltage applied from the capacitor C8 charges the capacitor C8 through the diode D, and the photoelectric voltage of the capacitor C3 is applied to the inner electrode of the sensor 1 and the outer S electrode (via the resistor R1). The other end of the Zener diode 2 is the thyristor 2
The anode of firistor 2 is connected to the alarm gate through the normally closed contact, and the cathode is connected to the alarm gate through the normally closed contact.
and connect to. Therefore, even when the thyristor 2 is turned on, the photovoltage of the capacitor C1 causes the sensor 1 to
Power for operation is supplied. On the other hand, the photoelectric current is transmitted from the normally closed contact SI to the capacitor C,' through the resistor R,'t-, and the voltage of the light from the capacitor C3 is applied to the external electrode of the sensor 1. In other words, the gate voltage of the field effect transistor FET is the sum of the charging voltage of the capacitor C1 and the voltage between the intermediate voltage and the external electrode of the sensor I (sensor output voltage). Further, a normally open contact S is connected in parallel to the capacitor C8.

Note that a series circuit of a resistor R3 and a capacitor C1 is connected in parallel to the relay 8, so that the relay 8 has delay recovery characteristics.

In this case, the capacitor C8 is charged by the voltage applied from the signal wires t and Lt via the backflow prevention diode D, and the intermediate voltage of the sensor l is connected to the intermediate voltage of the sensor l, for example, when there is no smoke. The voltage corresponding to the single pole impedance (
detection voltage) appears.

The impedance of this voltage is converted by the '-field effect transistors F and ET and input to the Zener diode Z, but the Zener diode 2 is in an off state at the above voltage when there is no smoke. On the other hand, the capacitor C3 is gradually photovoltaic across the resistor R2, and as the photoelectric voltage of the capacitor C3 rises, the voltage at the external electrode of the sensor 1 rises, and the gate voltage of the field effect transistor FET increases. This is the sum of the photoelectric voltage of C3 and the detection voltage of sensor 1. Since this voltage is impedance-converted and applied to the Zener diode 2, when the capacitor C1 reaches a constant voltage, the Zener diode becomes conductive and the thyristor 2 is turned on. When the relay 8 is operated by turning on the thyristor 2, the normally open contact S is closed, the potential of the outer S electrode of the sensor 1 is reduced, and the Zener diode Z is turned off. On the other hand, normally closed contact SI
is off, the thyristor 2 is turned off. When the relay 8 is restored after a slight delay time, the normally closed contact S1 is closed, the normally open contact St is opened, and the above-described operation is repeated. That is, the thyristor 2 is turned on at regular intervals. The constant period remains constant as long as the output range pressure of the sensor 1 during smokeless conditions is one foot, but the period changes when the smokeless output changes due to, for example, poor insulation of the sensor f1. Therefore, in normal times.

By monitoring the turn-on period of the thyristor 2, it can be determined whether the sensor 1 is normal or not.

Furthermore, when smoke occurs due to a fire, the output of the sensor 1 increases depending on the smoke concentration, so the thyristor 2 is turned on when the photoelectric voltage of the capacitor C3 is low. That is, the period in which the thyristor 2 is turned on becomes shorter. This shortening of the period corresponds to smoke density. That is, by creating the above cycle, Smoke II! It is possible to know If. W of the inner and outer electrodes of cent t1! If the continuation is reversed from the above, the cycle becomes longer in response to the smoke 111f, so it is possible to similarly know whether it is a secret or not.

FIG. 8 is a circuit diagram showing another embodiment of the present invention. That is, the sensor l and the capacitor C1 are connected in series between the warning signal L, , L, and the warning signal is connected.

A photoelectric current is passed through the resistor & to the capacitor C0.

That is, the resistor R1 and the capacitor CI connect the photodischarge circuit to mFyL, am (the output of the charging/discharging circuit,
1 is connected in series to sensor 1. Then, the output of sensor l is passed through Zener diode Z to thyristor 2.
to the gate terminal of. The switching circuit, which is turned on at a constant voltage, has been redesigned using the Zener diode 2 and the thyristor 2. The anode of the thyristor 2 is connected to the connection point of the front 8 pico/capacitor C1 and the resistor 4iR+, and the cathode is connected to the V rod wire. Therefore, when the thyristor 2 is turned on, the charge of the capacitor C3 is released and the Mf charge/discharge circuit is reset. After capacitor C1 completes discharging, it is held in thyristor 2*a
Since no current flows, the capacitor C1 is turned off and a photoelectric current begins to flow to the capacitor C1. In this case, the relay 8 and normally closed contact SI of the embodiment shown in Figure 5g1 above are omitted.

The thyristor 2 is used as a normally open contact Sat switching circuit. The circuit has a very low yield rate, and the same operation as described above can produce the same young fruit.

FIG. 94 is a circuit diagram showing an embodiment that is a refreshing improvement on the above invention. That is, the sensor L, the capacitor CI, and the gold wire are connected in series between , L, and the charging resistor R, is connected to one end of the capacitor C1. is a normally open contact S.

are connected in parallel. The output of sensor l is input to the gate of thyristor 2 via Zener diode 2. Anode 1 of thyristor 2; connected to III signal wire through normally open contact S and relay 8;
Connect to @ line Lm (common line). Then, the anode of the thyristor 2 is connected to the bottom input of the AND gate 4, and a pulse train of a constant period is inputted from the pulse oscillator 6 to the other input of the AND gate 4. Therefore, the AND gate 4 is opened while the thyristor 2 is off, and the output pulse of the pulse oscillator 6 is input to the counter 6. The counter 6 counts the human caballus. On the other hand, the anode of the thyristor 2 is connected to the strobe terminal of the latch circuit 8 and the reset terminal of the counter 6 via the inverter 7 (i!
to string. The counter 6ri is detected when the thyristor 2 is turned on, and then counts the output pulses of the pulse oscillation d5. When the next thyristor 2 is turned on, the color/return 6
The count value is latched in the latch circuit 8. The count 1 corresponds to the ON period of the thyristor 2. In other words, it corresponds to the sensor output. The counter 6ri is reset and starts counting the next pulse in #I41A again.

The count value held by the latch circuit 8 is set for the 1# signal line,
If you send it between L and Iwao, you can receive the above count value at the other end of Iwao (Uke 100 Tai) and know the sensor output. In this case, since information transmission is possible within a short time, it is possible to transmit signals from a plurality of sensors in a time-division manner, and a plurality of sensors can be connected to one pair of sensors.

As described above, in the present invention, a charging/discharging circuit that is reset by turning on a switching circuit that is turned on at a constant voltage is provided, and the output of the charging/discharging circuit and a sensor are connected in series to fil@fM, Since the on-period of the switching circuit is configured to change in accordance with the output voltage of the sensor output, it is possible to monitor abnormalities in the sensor based on changes in the on-period of the switching circuit.

That is, remote monitoring is easily possible. Further, since the period changes in accordance with the degree of smoke, etc., it is possible to know the degree of smoke by measuring the period or counting the number of pulses within the period. In other words, it becomes possible to understand the extent of the fire and its changes over time, and has the effect of making it possible to make a comprehensive judgment and take appropriate measures.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a specific circuit when the present invention is applied to an ionization smoke sensor, and FIG. A circuit diagram showing another embodiment. FIG. 4 is a circuit diagram showing a further improved embodiment of the invention. In the figure, 1...sensor, 2...thyristor, 8
...Relay, 4...AND circuit, 5...Pulse oscillator. 6... Counter, 7... Inverter, 8... Latch circuit, R1-R3... Resistor IC, ~Cs... Capacitor, S1...? l Closed contact, S...normally open contact, Z...zener diode, D...diode*
Ljl'Ljt...#@-1 Applicant Niratan Taishiki 9R Agent Masuoshi Shizurubo (and 2 others) Figure 1 Figure 2 11311 Figure 4 Flute

Claims (1)

[Scope of Claims] (Li) A fire detection device 6 that includes a sensor that outputs a voltage corresponding to temperature, etc., and a switching circuit that turns on when the output voltage of the sensor is above or below a certain value, It is characterized by comprising a charging/discharging circuit operated by power supplied from the alarm and reset by turning on the switching circuit, and connecting the output of the charging/discharging circuit and the sensor in series to the ! signal line. (2) A fire detector equipped with a sensor that outputs a voltage corresponding to smoke 1111m, temperature, etc., and a switching circuit that turns on when the output range pressure of the α sensor is above or below a certain value. , a photodischarge circuit operated by the power supplied from the switching circuit 11m1 and reset by the switching circuit 11m1, a pulse oscillator that outputs pulses of a constant period, and the pulse oscillator that is opened during the off period of the switching circuit. and a counter that counts the output pulses of the AND gate, and the output of the @distribution/discharge circuit and the sensor are connected in series between the -@ line. Fire detector as a physical image.