SU1642490A1 - Device for controlling fire-fighting means - Google Patents

Abstract

The invention relates to fire fighting equipment, namely, automatic start devices, fire extinguishing installations, fire door control, and can be used in gas or dust hazardous mines. The purpose of the invention is to increase the reliability of the device. When a fire breaks out, the contacts of the fire detector close, the comparator turns over and opens the power transistor switch through the inverter. If the battery is discharged, the device operates from the energy stored in a storage capacitor connected in parallel to the battery, after which the comparator overturns and blocks the inverter and the power transistor switch. When the switch button is pressed, if the battery is charged, the LED is lit continuously, if it is discharged - for a short time, as the voltage on the battery terminals drops and the comparator is tilted. 1 il.

Description

The invention relates to fire fighting equipment, namely, devices with automatic activation, for example, the length of switching on fire extinguishing installations, and can be used in mines that are dangerous for gas or dust.

The aim of the invention is to increase the functional reliability of the device.

The drawing shows the electrical circuit of the device for controlling the extinguishing agents.

The device contains closing contacts 1 of fire detectors, power supply unit 2 (battery), current-setting resistors 3-9, key 10, made on transistor 11c by resistor 12, inverter, made on transistor 13, current-setting resistors 14 and 15, decoupling diode 16, a zener diode 17, a comparator 18, a switch 19 with a closing contact 20 and a switching group 21, an LED 22 and a storage capacitor 23.

Position 24 marked the starting element of the fire extinguishing unit, for example, a squib.

The device works as follows.

If a fire occurs, the fireman from the broadcaster is activated and contact 1 is closed (dry contact or contact of the output relay of the detector).

If battery 2 is charged, the non-inverting input of comparator 16, eg O

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The voltage will be higher than at the inverting voltage, and at the output of the comparator - a voltage equal to logic 1. When this happens, transistors 13 and 11 open, the starting element 24 is connected to the battery 1. The fire extinguishing installation turns on; During operation, the battery voltage is not allowed to decrease 2 under load below the minimum value, KoYopafl is set by selecting current-supply resistors 4-6 and zener diode 17. If battery 2 appears to be discharged below the set voltage, but a signal comes to turn on from the fire detector ( contact 1 was connected, then after a short current pulse through element 24, when capacitor 23 is sufficient to turn on the fire extinguishing unit, battery 2 is automatically disconnected from element 24 (because the voltage at the non-inverting input of the comparator 18 is lower than at the inverting , and at the output of the comparator 18, the voltage is equal to logical O, the transistors 11 and 13 are closed, the element 24 is disconnected from the battery 2).

When performing a visual check, the operator manually closes the contact 20 of the switch 19 in the current-setting resistor circuit 10 and through the diode 16 and resistor 7 applies a voltage to the non-inverting input of the comparator 18. The base circuit of transistor 11 is opened and the resistor 9 and LED 10 are closed.

If the battery 2 is also charged at the non-inverting input of the comparator 18, the voltage is higher than that at the inverting voltage, then at the output of the comparator 18 the voltage is equal to logical 1, which ensures the opening of the transistors 13, and LED 22 lights up. If the battery 2 is discharged, then after discharging the capacitor 23, the voltage at the inverting input of the comparator 18 is lower than that at the inverting, at the output of the comparator 18, the voltage becomes equal to logical O. Transistor 13 closes and the LED 22 goes out after a short light.

The ratings of the current-setting resistors 5 and 7 are selected so that the resistor 5 has a resistance slightly lower than the current-setting resistor 7, which allows for checking and detecting the need to charge the battery 2 to have additional voltage reserves for the operation of the fire extinguishing installation.

Claims (1)

Invention Formula Means control device fire extinguishing device containing the closing contacts of fire detectors, power supply unit, the first, second and third current setting resistors, the key whose output is an output of the device, an inverter, that is, in order to increase the functional reliability of the device, a storage capacitor, a comparator, a zener diode, a decoupling diode, a LED, a switch, six current-supply resistors, a power supply unit are introduced into it torus, a series-connected zener diode and the first current-supplying resistor, a serially connected closing contact of the switch, and a second current-setting resistor are connected to the first and second terminals of the battery, the junction point a first audio zener voltage driving resistor connected to one input of a comparator, the other input of which is connected to the one you Waters third th, fourth, fifth voltage driving resistor, and via the sixth resistor connected to the voltage driving one terminal of the battery, the second output of the third current-setting resistor through the closing contacts of fire detectors is connected to another terminal of the battery, the other output of the fourth current-setting A resistor is connected via an isolating diode to the connection point of the second current-supplying resistor with the switching contact of the switch, the second output of the fifth current-carrying resistor and the first output the seventh current-setting resistor is connected to the comparator output, the second output of the seventh current-setting resistor is connected to the input of the inverter, the output of which is through the eighth current-setting resistor connected to the switching contact of the switching group of the switch, the closing contact of which through the series-connected ninth resistor and LED is connected to the other and the battery terminal, and the disconnecting contact of the switching group of the switch is connected to the other terminal of the battery .