UA89550C2 - Abushkevych's thermal fire alarm device - Google Patents

Abstract

The thermal fire alarm device of Abushkevych relates to the fire alarm system and can be sued to detect rise in temperature of environment above he established limit value. The annunciator comprises a LED indicator, two transistors, two diodes, two condensers, five resistors and two input terminals. In addition there is a current limiter, the third transistor and the third condenser in it and the thermal sensor is made as a thermoresistor. In the annunciator at the expense of interrelations of the specified elements and application of the thermoresistor in the form of the thermal sensor the there is an increase of temperature stability of the annunciator functioning in a wide of power supply voltage range and even in conditions of elevated vibration expanding area of its application.

Description

The disadvantage of such an indicator is also that the anode of the first diode 4. The cathode of the first diode 4. The operating temperature of such an indicator is connected to the first output of the first capacitor. It depends only on the operating temperature of the sator 5, and through the second resistor 6 - to the base of the contact heating element. Such a dependence of the transistor 7, the collector of which is connected to does not allow, in the conditions of mass production, the base of the first transistor 3. Between the base and the emirate to change the class of the thermal fire spotter of the first transistor, the second hanger is connected in accordance with market requirements. In addition, the capacitor 8 and the third resistor 9. The second diode 10 is a pulsating heating element, which is used in its anode is connected to the first input terminal of the thermal sensor, does not provide a stable we 11, and the cathode - to the emitter of the first transistor - the value of the operating temperature detector ra 3. The second input terminal 12 is connected to the second in conditions of increased vibration. output of the first capacitor 5, the cathode of the LED

The basis of the invention is the problem of idle indicator 1, in addition, due to thermal sensing as a thermal sensor of the thermistor, which sor 13 - to the first output of the fourth resistor allows due to connections with other elements 14, and through the fifth resistor 15 - to the emitters of the second circuit to set the operating temperature of the first and third transistors 7 and 16. The collector of the trap hanger is connected to the base of the second transistor 16 by a simple ratio of the resistances of the second transistor 16. In addition, this application of the thermistor of the transistor 7. The base of the third transistor 16 allows to exclude the influence of vibration on the temperature of the first terminal of the fourth resistor and the triggering of the detector. 14, the second output of which is connected to the anode of the light

The task is solved by the fact that the temperature of the diode indicator 1 and the output of the limiter 17 is the fire detector of Abushkevich, which current. The input of the current limiter 17 is connected contains an LED indicator, the anode of which is connected to the cathode of the second diode 10, and the first terminal of the first resistor is connected to the collector of the first third capacitor 18, the second terminal of which is connected to the transistor and the anode of the first diode, the cathode of which is connected with the second input terminal 12. The thermal sensor connected to the first output of the first capacitor 13 is made as a thermistor. sator, and through the second resistor - to the base of the second Abushkevich's thermal fire alarm transistor, the collector of which is connected to the base and works in this way. If the ambient temperature of the first transistor, the first terminals of the second medium is below the limit temperature of the capacitor and the third resistor, the second terminals of the trigger for the selected class of detector, which are connected to the emitter of the first transistor, the resistance value of the thermistor 13 will be large. After the cathode of the second diode, the anode of which is connected to the supply voltage to the input terminals 11 and 12, to the first input terminal, and the second input terminal is connected to the second terminal of the first capacitor, nsators 5, 8 due to the lack of charge on all three. and 18, the first and second transistors of the cathode of the LED indicator, in addition, through Z and 7 will be closed. The second diode 10 performs a thermal sensor - to the first terminal of the fourth protection of other elements of the circuit represented by the resistor, and through the fifth resistor - to the emitter in the figure, with the wrong polarity connection to the second transistor, which differs in that the power strips. In the normal state, through the second additionally contains a third transistor, the collector of the second diode 10, the charge of the third capacitor is carried out, which is connected to the base of the second transistor, the emitter 18, and a portion of the current of a stable value, which ter is connected to the emitter of the third transistor - passes through the current limiter 17, provides a torus, the base of which is connected to the first terminal, a stable voltage drop on the LED indicator of the fourth resistor, the second terminal of which is connected to connector 1. The value of the current passing through it with the anode of the LED indicator and the output LED indicator 1 does not exceed 50μKA, the house of the current limiter, the input of which is connected to the reason that LED indicator 1 acts as a circuit breaker to the cathode of the second diode, and the first output of the voltage limiter at the level of (1.5-2) V, practically the same capacitor, the second output of which is connected to emitting light. Due to the high resistance of the second input terminal, and the thermal sensor of the thermistor 13 is connected to the base of the third transistor 16 as a thermistor. a potential that opens this transistor is applied

In the proposed thermal fire 16. Part of the current passing through the detector circuit due to the use of a thermistor in the second and fifth resistors 2, 6 and 15, the quality of the thermal sensor is ensured by the stable first diode 4, and also through the collector - the emissivity of the trigger temperature of the detector of the third transistor 16 reliably closes the second branch in conditions of increased vibration. In addition, the use of transistor 7. The current consumption of the thermal fire of the thermistor as an analog sensor, on which the detector in the regular mode of operation is no different from a contact sensor, allows the installation to exceed the noise flowing through the bulging class of the thermal detector, respectively, the limiter 17 stum, because the reverse currents of per- to the requirements of regulatory documents such as DSTU of the second and second transistors Z and 7 are significantly less

EM54-5: 2003 and NPB 85-2000 by a simple correlation of the specified value in the entire range of the working resistance of the resistors. stripes up to 30 V. In this state, the voltage drop on

The figure shows the block - circuit of the thermal capacitor 5 is (1.2-1.5) V, and the fire detector. almost does not depend on the ambient temperature

Abushkevich's thermal fire detector of air, because the temperature coefficients of the voltage (see figure) contains which contains the LED and the first diode 4 indicator 1, the anode of which through the first resistor 2 are almost equal to each other. connected to the collector of the first transistor Z and

The thermistor 13 is located outside the body of the detector. After its switching, a significant part of the current of the detector, and other elements are in the body. In the case of a quasi-lector of the first transistor Z, all the changes in the temperature of the surrounding air will flow through the first resistor 2. The resistance value of the first elements has the temperature of the air. With a significant resistor 2, it is chosen sufficient for the normal rate of temperature rise due to the low operation of the LED indicator 1, which in the case of low mass, the thermistor 13 quickly gains temperature. In addition, the value of the resistance is more inertial, because the temperature in the housing of the first resistor 2 is ensured by the formation of the detector will increase with a significant presence of "BED" in the fire alarm loop, which is connected to the input terminals 11 and 12. On-

On the second and third transistors 7 and 16, the potential on the collector of the first transistor C is reproduced, the boundary element - the Schmitt trigger on the second input terminal 12 depends on the current, a typical circuit on transistors with coupled emitters, flowing between the input terminals 11 and 12 .Through the frames. The temperature instability of the voltage through the first diode 4 will flow a current that will ensure the activation of such a trigger significantly depends on the flow of charge on the first capacitor 5. The temperature coefficient of the base-emitter voltage of the base of the second transistor 7 relative to the second and third transistor 16. At the same time, the temperature of the input terminal 12 will increase so that the constant voltage coefficient of the LED indicator of the collector of this transistor 7 will be sufficient for 1 almost equal to the temperature coefficient of preservation of the state of "PLUG" even when the base-emitter voltage of the third transistor 16 is restored. of high resistance by the thermistor 13. In this way, the switching temperature of the trigger, the preservation of the state of the

Schmitt on the emitter-connected transistors 7 and ZHA" of the thermal fire detector, even with 16 . That is, the temperature inertia 15 is more than 2 V, the third transistor 16 will depend on the inertia of the thermistor closed. In addition, due to the accumulated 13, and almost does not depend on the inertia of the rest of the series on the first capacitor 5, the elements of the detector circuit provide storage of the state of the detector. " in the presence of impu-

If the electric power supply of the detector is carried out by the reverse voltage of the specified frequency and comes from the loop of the fire alarm from the signal duration. But the absence of constant voltage supply voltage, when the frequency of bypass polarity pulses for several seconds and the reverse voltage exceeds the value (4 - 5), and when the high resistance is restored by the thermistor 13, the duration of these pulses does not exceed 0.1 s, then it returns the thermal fire detector in the initial limiter 17 of the stum ensures the stability of the new state of the duty mode of operation. stripes on the LED indicator 1 during such Thermistor 13 has a fixed value of the resistance of supply voltage dips due to the accumulated charge on the third capacitor 18 at a normal value of the ambient temperature. air When the temperature increases, the thermal resistance

Thus, in the regular mode of operation, the ammeter 13 decreases with a given coefficient. even during the action of reverse voltage pulses, the third The thermistor of the company meets these requirements, the transistor 16 will remain open, and the per- RNISHRZ of the 640 series and others. The third and second transistors C and 7 will remain closed. correspond to the prototype. Temperature triggered

When the ambient temperature of the detector is reached, the limit value of the thermal sensor depends on the ratio of the environment of the fourth resistor 14 and the thermistor 13. For 13, it will reduce its resistance, thus, due to the use of the thermistor 13, the potential on the basis of the third transistor will be changed 16. catch sensor, as well as the Schmitt trigger on the trans-

As a result of which the trigger switching of transistors 7 and 16 will occur, the stability of the

Schmitt - the third transistor 16 will close, and the second transistor 7 will open even in conditions of increased operation. Emitter current of the second vibration. Due to the use of the third capacitor, the transistor 7 exceeds the emitter current of the third capacitor 18 and the current limiter 17 with their connections of the transistor 16, therefore the voltage drop increases. With other elements, the stability of the fifth resistor 15 is ensured, which in turn the tripping temperature of the annunciator in the wide-ranging process of closing the third transistor 16. in the supply voltage range, as well as when the

Through the third resistor 9, a current of a sufficiently slow detector with alternating voltage flows. values for opening the first transistor 3.

but, i and 4-3 8 p19 with MORE shchi 3 or i o u: shi! 4 th b 7 5-6 8V-- -5x

I 13 185 1st - "TU and 5 Pe

ZI

Computer layout L. Kupenko Signature Circulation 28 approx.

Ministry of Education and Science of Ukraine

State Department of Intellectual Property, str. Urytskogo, 45, Kyiv, MSP, 03680, Ukraine

SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, Kyiv - 42, 01601