SU977000A1 - Automatic fire fighting system - Google Patents

Description

OR, the device for monitoring the presence of people is connected to the input of the first element AND, the first channel of the warning unit is connected to the input of the second element AND, and the outputs of the first and second elements AND are connected to the input of the third element AND, the second channel of the warning unit is connected to the input of the fourth element And, and the outputs of the third and fourth elements And connected to the input element OR, the output of which is connected to the input of the evaluation unit alerts.

The drawing shows a block diagram of an automatic fire extinguishing system.

The system includes two smoke or heat (or smoke and heat) detector 1, two light 2 flame, device 3 controls the presence of people at the object of protection, logic unit 4, consisting of the first 5, second 6, fourth 7, third 8 elements And And element OR 9, alert unit 10, control and regulation device 11, start valve 12, tank 13 with a fire extinguishing agent, sprayer 14 for discharging portions of a fire extinguishing agent, alarm block 15 with a start device 16 and a stop device 17.

Block 10 alerts in various systems. Automatic fire extinguishing can be performed in various ways depending on the specifics of the purpose of the system. This can be a control tower station with indication and control panels and an operator included in the control loop. In this case, the unit must have information and control inputs. The first ones are designed to receive current information from the object and to indicate it on the placards to assess the situation by the operator and make decisions on issuing control influences to the actuators. Using the second information in critical situations, it directly generates, controls the effects on the controls and regulators that activate the automatic fire extinguishing agents. It is possible to perform such a unit with the help of a specialized computer included in the circuit of the ACS for fire safety.

The device 3 for controlling the presence of people can have various designs and is performed on any quick-response sensors and elements that produce stable unified signals and have high reliability indicators, for example, in the form of a device consisting of photoelectric sensors, pulse formers, scaling units, and

also a reversible counter, from the outputs of which constant information about the presence of people at the object of protection is removed.

A logical block consists of four AND elements and an OR element,

The system works in the following way.

Under the conditions of the normal operation of the object, information about the presence of people from the outputs of the control device 3 and about the fire condition of the object. From the outputs of the detectors 1 and 2, it constantly goes to the information inputs of the notification block 10.

When one of the smoke or heat detectors is triggered, the signal from it goes to one of the inputs of the second element I 6 and to one of the information inputs of the alert unit 10, where the corresponding signal should light up on the display. If the alarm is not false, then the second detector 1 should be triggered, the signal from which goes to the second input of the second element, And b, caused it to work. The signal from its output is fed to the first input of the third element And 8, and the device 16

start unit 15 alarm. In addition, the signal from the second detector 1 is fed to the corresponding information input unit 10 confirming the alarm. Through the device 16 start block 15 alarm. On its basis, personnel leave the object, which is constantly monitored by device 3. The zeroes of all bits of the reversible counter standing at the output of device 3 are assembled on the first element 5 of the logic block 4. In the case of complete release of the monitored room at the outputs of all bits of the counter zeros appear, which triggers the first element AND 5, the signal from the output of which goes to the stop device 17 of the alarm block 15, which is turned off by this signal, as well as to the second input of the third element AND 8, otorrhea triggered, since the first input is already present a signal output from the two detectors triggered

 1 of the second element AND 6. Thus, the element 5 and, together with the device 3, blocks the starting signals on the fire extinguishing device until the object is completely free of personnel. The signal from the output of the actuated element AND 8 through the element OR 9 enters the control input of the unit 10, from which the control and regulation device 11 activates the starting valve 12, which opens the pipeline and allows a portion of the extinguishing agent from the tank 13 to be directed through the sprayer 14 to the zone of arising fire

If after a predetermined predetermined time, for example 10 seconds, the second of the pair of detectors 1 does not work, then the signal of the first detector is perceived by block 10 as false and measures are taken to bring the triggered detector to its initial state.

For rational use of the fire extinguishing agent and to avoid losses as a result of treating wealth with fire extinguishing substances, a control device (11) in the control and regulation device 11 has a timer (on the diagram, not shown), which is automatically activated simultaneously with the device 11 by a signal from block 10. after a specified time, for example 10 seconds, gives a signal to turn off the supply of fire extinguishing agent. If the fire is non-extinguished and the signal from the detectors 1 continues to flow, the next portion of the extinguishing agent is supplied. And so it goes on until the fire is completely eliminated to remove the signal from the detectors 1.

The alarm block 15 is triggered only by the presence of people at the protection object, since otherwise it is blocked by a stop device, to which the signal from the first AND 5 element is given, indicating that there are no people at the object. The removal of the signal from the alarm block 15 duplicates the fact that there are no people on the object, attacks on the information inputs of block 10, and indicates that a signal has been sent to the control input from block 10 to turn on the fire extinguishing installations.

The 2 tribe fire detectors are not connected to the 3 people presence control device, since the evacuation must be completed at an early stage of the fire. In order to eliminate the possibility of false triggering, the flame detectors 2 are also duplicated and their outputs are connected in the same way as the detectors 1 to the inputs of the fourth element And 7. In the case of both detectors 2, the signals from them go to the information inputs of block 10, ignition On the board there is an alarm signal, and the element 7 is triggered. The signal from the output of which enters the start device 16 of the alarm block 15 causes it to

action, as well as through the element OR 9 - to the control input of the block 10.

In block 10, a programmed, pause is made for the time it takes to forward if

he is still at the facility, on signal from the alarm unit left the room in which the fire occurred. This time is set in advance depending on the parameters of the object.

and is usually 10–20 s, after which a signal is sent from unit 10 through control and adjustment device 11 to start fire extinguishing installations. Further system operation

proceeds as described above.

The proposed system allows to take into account such factors as the presence of people in the room, the reliability of information from fire detectors

and the degree of fire development.

The logic block allows to exclude the possibility of false alarms of the fire extinguishing installation and false alarms.

Claims (1)

Invention Formula An automatic fire extinguishing system containing a tank for an extinguishing agent, connected through a trigger valve to the sprayers, a control device whose input is connected to the alarm unit and an output to the starting valve, the first channel of the warning unit with smoke and heat fire detectors and the second channel an alert unit with at least two light sensors, characterized in that, in order to expand its functionality, it has a device for controlling the presence of people and a logical unit consisting of cops And and the OR element, wherein the device for controlling the presence of people is connected to the input of the first element AND, the first channel of the warning unit is connected to the input of the second element AND, and the outputs of the first and second elements AND are connected to the input of the third element AND the second channel of the notification block is connected to the input of the fourth AND element, and the outputs of the third and fourth AND elements are connected to the input of the OR element, the output of which is connected to the input of the alert evaluation unit. Sources of information taken into account in the examination D. Patent 4005754, cl. A 62 C 37/04, 1977.