SU451111A1 - Device for registering an emergency condition in fire protection systems - Google Patents

Description

one

The invention relates to automatic signaling and can be used to detect the ultraviolet radiation of a flame of a gas-vapor, dust-air mixture under conditions of high stock and industrial interference.

A device is known for registering an emergency condition in fire protection systems containing a photon counter, connected to the input of the first amplifier, one of whose outputs through the driver is connected to the input of a pulse counter, and another output of the first amplifier is connected to the input of a time relay, trigger, signal-start unit connected to one of the COOT corresponding pulse counter outputs, a transformer and a switch.

However, if there are two sensitive elements, individual connecting lines are required and, despite the use of two sensitive elements, the device does not provide sufficient reliability to prevent false alarms, because if the duration of the interference exceeds the switch-on time of the second sensitive element, the device gives a false signal.

The purpose of the invention is to increase reliability and eliminate false positives on the basis of selection for a certain time interval of the number of pulses exceeding the number

elementary counting cell pulse counter.

This is achieved by introducing a second amplifier, a single pulse generator and a pair divider, and one of the time relay outputs is connected to a common point of a voltage divider connected to the corresponding pulse counter output, the other time relay output is connected to one of the trigger inputs , the other input of which is connected through a second amplifier connected in series, a transformer and a switch to one of the cells of the pulse counter, and the trigger output is connected to the input of a single pulse generator, you whose course is connected to the common point of the voltage divider.

The drawing shows a block diagram of the proposed device.

The device contains a photon counter 1 connected to the input of the first reader 2, a driver 3 connected to the input of the pulse counter 4, a time relay 5 connected to trigger 6, a single-pulse generator 7 connected to a common point of the voltage divider made on resistors 8, 9 and 10, the second amplifier 11, connected via a transformer 12 and a switch 13 to a pulse counter, a signal start unit 14 connected to a pulse counter

4, a resistor 15 connected to a zero counting cell of a pulse counter with cathodes 16-25.

The principle of operation of the device is as follows.

When a flame is registered in the photon counter 1, an avalanche-like operation occurs, the current pulse goes to the controller 2. The first pulse from amplifier 2 arrives at time relay 5, providing a specified duration ;; c .; selection of the required number of imiuls, and pulse generator 3 to start pulse counter 4. From the intermediate counting cell of pulse counter 4, for example, cathode 20, a pulse is fed through switch 13 and transformer 12 to amplifier 11, the output signal from which triggers the trigger 6 triggers the single-pulse generator 7. The signal from the single-imulse generator 7 is released to the resistor 9 and the pulse is sent to the cathodes of the impeller 4 through the resistors 8 and 10, zeroing it.

When pulses along this circuit are received even five pulses, zeroing of the pulses 4 does not occur, since the trigger 6 is in the inverted state and does not generate the trigger pulses necessary to generate a single reset pulse for the generator of single pulses 7.

Upon receipt of new pulses, the subsequent elementary counting cells of pulse counter 4 are turned on. If thus in a given selection interval 5-15 seconds from the moment it arrives at pulse amplifier 2 from the photon counter 1 of the first pulse, the final counting cell, the cathode 24, is triggered, the signal the starting block, and the investigator, the device as a whole. In this case, the control pulse arrives at the actuators of the fire and explosion protection systems. If during the time interval the number of pulses is not enough to turn on the terminal elementary counting cell - cathode 24, then the relay times through the voltage divider on the resistors 8, 9 and 10, zeroes the pulse counter and returns the trigger to the initial

state - the device in this case will not work.

This electrical circuit significantly extends the life of the photon counter. In the initial period of operation, when the background frequency of imitation is small, it is advisable to record a small number of impulses in a given selection interval, and as the duration of work increases during the same time interval of selection, to register a larger number of pulses. The minimum number of emulsions that ensures the operation of the device during the accepted selection time is ten (when the switch 13 is connected to the elementary counting cell 16), and the maximum is seventeen (when the switch 13 is connected to the elementary counting cell 23).

Subject invention

A device for registering an emergency condition in fire protection systems containing a photon counter, connected to the first amplifier's 5 input, one of the outputs of which is connected to the immersion counter input through the driver, and the other amplifier of the first amplifier is connected to the time relay input, trigger, sino-starting block, connected to one of the corresponding outputs of the pulse counter, a trapsformer and a switch, which is ni, e, by the fact that, in order to increase the reliability of the device, a second amplifier was inserted into it, a single imiuls generator and voltage divider, one of the time relay outputs connected to a common point of a voltage divider connected to the corresponding pulse counter output, another time relay output connected to one of the trigger inputs, the other input of which is connected through successively connected second amplifier, a transformer and a switch to one of the cells of the pmiuls counter, and the trigger output is connected to the input of a single emulsion generator, the output of which is connected to the common point of the voltage divider .

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