SU598105A1 - Fire-warning device for centralized supervision systems - Google Patents

Description

The invention relates to the technique of fire alarm and fire alarm systems and can be used as an objective device in centralized monitoring systems using subscriber telephone communication lines.

A fire alarm device (Signal-31) containing a blocking control node, an indication unit, an information transfer unit and a subscriber telephone line 1 is known. It monitors the blocking loop, activates local signaling if the loop is damaged and transmits to the central monitoring system the alarm is triggered by the relay contacts, however, it does not automate the process of removing and taking an object under the protection of trusted persons and issuing to the central monitoring system shake news.

The closest to the technical essence of this invention is a device containing a signal circuit connected to the first input of the signal conditioner, the output of which is connected to a switch, a subscriber telephone line with an amplifier and a control unit, an encoder, a fire signal circuit 2. Such a device provides sensor monitoring security and fire alarms: automatic fixation of the operation of any sensor included in the signal circuit; galvanic isolation of the signal circuit and telephone line; automatic control of the process of taking off the guard and taking under the protection of the object; generation of signals “Taking an object under protection to the central monitoring station only when the signal circuit is intact.

However, this device has the following disadvantages. The fire signal is generated by a short circuit of the subscriber telephone line and when conducting preventive maintenance at the PBX, on the central monitoring unit there are false signals about the fire as a result of accidental closure of the subscriber telephone line; the device does not allow to protect objects that are paired or connected in parallel telephone sets; does not provide round-the-clock security of the facility with constant monitoring of the subscriber line, provided that the telephone connection is maintained; The ground signal is used as a third wire to form the signal “Arming of the object under protection”, which reduces the noise immunity of the centralized monitoring system. 1 and introduces additional interference to the equipment. LTA.

The aim of the invention is to increase the reliability of the device by monitoring the state of the protected object and expanding the functionality of the device by using the "ground" when generating the signal "Arming the object under protection.

This is achieved by introducing a display unit and a generator of sinusoidal oscillations into the proposed device, and a signal driver is made in a multivibrator, a diode, an OR element and transistor switches, the output of the first transistor switch is connected to the first input of the multivibrator and the input of the second transistor switch, the output of which is connected to the second input of the multivibrator, the output of the multivibrator is connected to the anode of the diode, the cathode of which is connected to the first input of the OR element, the output of the OR element is connected to the input of the third trans a source key whose output is connected to a switch, the fire signal circuit is connected to the input of the first transistor key of the driver, the encoder is connected to the input of the second transistor key of the driver, the inputs of the generator and the display unit are connected to the switch, and the output of the sinusoidal oscillator is connected to the amplifier of the subscriber telephone line .

The drawing shows a functional diagram of the device.

The device includes a signal conditioner 1, a sinusoidal oscillator 2, a control unit 3, a fire signal circuit 4, a switch 5, a circuit 6, a circuit 7, an encoder 8, a display unit 9, an amplifier 10, a subscriber telephone line 11.

When the object is not armed, to the input of the third transistor switch 12 through the diode 13 of the OR element and the switch 5 is connected the first security signal 6, designed to protect the object during the daytime. The ignition signal circuit 4 is connected to the input of transistor switch 14 permanently. The transistor 14 and second 15 keys are then closed, the multivibrator 16 is turned off, and the signal for the diode 17 from the multivibrator is "O, which passed through the diode 17 and is applied to the cathode of the diode 18 of the OR element. Negative bias does not enter the input of the transistor KEY. E and through the diode 13, because a zero potential is applied to its cathode through the signal circuit 6. Transistor switch 12 is closed and does not affect the operation of the sinusoidal oscillation generator 2. The frequency signal from the generator through the amplifier 10 and the control unit 3 are supplied to the subscriber telephone line 11, and from the communication line to the centralized monitoring system, where it is decoded as the signal "Worm." Thus, continuous monitoring of the operability of the subscriber line operability device and signal circuits at the facility is performed. The control unit 3 provides separation of information signals from telephone and conversational signals.

For night security organizations, a specific code is set on the encoder 8 as well.

switch 5 is switched to the position of the night guard, as a result of which a signal is connected to the input of the transistor switch 12, a circuit 7 intended to guard objects at night. The output of the transistor switch 12 is connected via a switch 5 to the input of the amplifier 19 of the display unit 9. If the signal circuit is intact, the transistor switch 12 is closed, a negative signal from this switch is fed through the amplifiers 19 and 20

.JQ to the input of the transistor switch 21. The transistor switch 21 opens and turns on the signal lamp 22, which signals to the responsible person that the signal circuit 7 is operational. The frequency signal from oscillator 2 through amplifier 10 and control unit 3 continues to flow into the subscriber line. When a guarded object is penetrated, the signal circuit 7 is broken, as a result of which a negative transistor is supplied to the input of transistor switch 12 through diode 13 and resistor 23

0, key 12 opens and turns off the generator of sinusoidal oscillations 2. The frequency signal in the subscriber telephone line AND disappears, and therefore the flow of the frequency signal to the central monitoring system, which also produces an "Alarm." In the event of a fire on the object, one of the fire sensors triggered is included in the fire signal circuit 4, the transistor switch 14 opens, changes the resistance value included in the base

3Q of one of the transistors of the multivibrator 16 and causes the opening of the transistor switch 15, which supplies " On the power source 24 to the first transistor of the multivibrator. The multivibrator is turned on, and negative and .5 pulses with a period of time t begin to flow to the anode of diode 17. In response to this pulse. A negative bias coming through the resistor 25 and the diode 18 opens the transistor switch 12, which turns on the generator 2. In the subscriber's telephone line 11, in the event of a fire, the object will have frequency bursts with the following period t. These parcels from the communication line arrive at the central monitoring system, which decodes them as a “Fire. When entering the object, the responsible person sets the necessary ko on the encoder 8, and a signal arrives from the encoder to the input of the transistor switch, transistor switch 15 opens and switches on the multivibrator 16. With the multivibrator, negative impulses with a period of 2t will start to arrive at the anode of the diode.

Transistor switch 12 will open when these pulses are present and turn off generator 2. In subscriber line 11, the TC sends frequency packets with a 2t following period, which are fed from the link to the central monitoring system, where it is decoded as a signal. If the set code is not correctly dialed from encoder B, the output of transistor switch 12 will be sent to "About the power source 24, 0, generator-mountains 2, turn off and