SU877591A1 - Alarm signalling device - Google Patents

Description

(54) DEVICE. ALARM ALARM

I

The invention relates to a fire alarm technique and can be applied to guard objects equipped with interlocking loops with electrical contact sensors and fire detectors.

A device containing a power source, a measuring bridge, in one of the arms of which the interlock loop with electrocontact sensors and a load in the form of a resistor is known, is included in one of the diagonals of the bridge the control device D3

The closest in technical essence to the present invention is a fire alarm device containing a sensor in the form of a bridge, in one arm of which there is a blocking cable with electrical contact sensors and a load in the form of a resistor, a DC amplifier, a sound alarm, a power amplifier, a multivibrator, connected to the output

a DC amplifier; the output of the multivibrator is connected to the input of a power amplifier connected to an audible alarm 2.

A common drawback of the devices described above is the low reliability of the control of the interlocking loop, equipped with electrocontact sensors. In conditions of high humidity, leakage resistance between

10 wires of the locking loop may decrease, while the series resistance of the locking loop increases, resulting in a slight change in the total

15 current in the loop and the absence of the issuance of an alarm signal in the event of a break or short circuit of the external terminating resistor. In addition, the use of electrocontact sensors in the locking loop, whose contact groups have strongly pronounced fritting, can lead to false alarms in the case of serial 38 or no triggering when sensors are connected in parallel. In the locking loop, in this case, to restore the minimum contact resistance of the sensors through they require currents of several tens of milliamperes and above, which for these devices would lead to a sharp increase in the consumption of m implications and deterioration of the maximum permissible parameters of the blocking loop. The purpose of the invention is to improve the reliability of the alarm device. The goal is achieved by the fact that a known device of a fire alarm containing a multivibrator, a locking loop with electrical contact sensors, a load included at the end of the locking loop, an alarm device, a delay block, charge blocks and recharges, electronic charge keys and recharge, switch-on unit, blocking node, control signal generating unit, pulse analyzer, with the outputs of the multivibrator connected to the inputs of the electronic charge and recharge keys, the first outputs of the electronic the recharge key and charge unit are connected respectively to the first and second inputs of the delay unit, the second outputs are connected to the first shoulder of the locking loop, the second shoulder of the lock loop is connected to the output of the transfer unit, to the first output of the electronic charge key and to the input of the blocking node , the second output of the electronic key of the charge is connected to the input of the charging unit, the output of the blocking node is connected to the input of the block forming the control signal, the output of which is connected to the first input of the pulse analyzer, the second input of the pulse analysis Ator connected to the output of the delay unit, the third input pulse analyzer - to the third output e, ics key overcharge, the first output pulse analyzer connected to an input unit incorporating whose output is connected to block overcharge, the second output pulse analyzer connected to an alarm input. The drawing shows a block diagram of an alarm device. The DEVICE for alarm consists of a block 1 delay, a block 2 charge, an electronic key 3 recharge, a multivibrator 4, an interlock 5 with electric contact sensors, a block 6 recharge, an electronic key 7 charge, a load 8 made in the form of a block capacitor 9 switchings, blocking unit 10, block 1I of forming a control signal, a pulse analyzer 12 and a signaling device 13. The outputs of the multivibrator are connected to the inputs of the charge electronic switches 7 and 3 recharges, the second output of the electronic switch 3 is recharged and connected chen to the first shoulder of lock 5, the first output to the first input of the 1dad block, the second input of the 1 delay block 1 is connected to the first output of the 2 charge block, the second output of the 2zar block is connected to the first shoulder of the 5 locking loop, the input of the 2 charge block is connected to the second output of the electronic key 7 charge, the first output of which is connected to the second shoulder of the locking loop 5, at the end of the loop between its shoulders a load 8 in the form of a capacitor is connected, the second shoulder of the locking loop 5 is connected to the input of the locking unit 10, the output of which is connected On the input of the pilot signal generation unit 11, the output of the pilot signal generation unit 11 is connected to the first input of the pulse analyzer 12, the second input of the pulse analyzer 12 is connected to the delay unit 1, the third input of the pulse analyzer 12 is connected to the third output of the electronic reset switch 3, the first output of the pulse analyzer 12 is connected to the input of the switching-on unit 9, the output of which is connected to the input of the re-charge unit 6, the output of the re-charging unit 6 and connected to the second arm of lock 5, the second output and The pulse analyzer 12 is connected to the input of the detector 13. After switching on the device with a good locking cable 5, the multivibrator 4 starts working, from the outputs of which - the emitters of the transistors 14 and 15 - the control signals in the remote phase arrive at the inputs of the electronic switches 7 of charge and 3 overcharging Yes, performed on transistors, alternately opening them. If in this half-period of operation of the multivibrator the transistor of the charging electronic key 7 is open, then from the collector of this transistor through the diode 16 a control signal goes to the input-block 2 of the charge and opens the transistor 17 of this unit. The current from the power source starts to flow through the open transistor 17 of the charge unit 2, the limiting resistor 18, the first shoulder of the locking cable 5, the load 8, the second shoulder of the locking cable 5, the diode 19, the electronic transistor of the charging 7 key. The load capacitor 8 is charged. A signal is received from the open transistor 17 collector of the charge unit 2 to the second delay unit 1, which prepares this unit for the next stage of operation. The magnitude of the voltage to which the load capacitor 8 is charged during this period of time is uniquely determined by the parameters of the blocking circuit. The greater the series resistance of the blocking loop, the longer the charge capacitor 8 charge time, the lower the voltage it will charge in half the operation time of the multivibrator. If a leak occurs between the shoulders of the blocking loop, the leakage resistance shunts the load 8 and takes a portion of the charge current of the load capacitor 8, and it is charged to a lower voltage. Thus, both an increase in the series resistance and a decrease in the resistance of the blocking loop leak lead to a decrease in the voltage on the load capacitor 8, to which it is charged during the charging time, the combined effect of these factors even more reduces the value of the maximum load on the capacitor 8. In the next half-period of the multivibrator operation, transistor 14 opens, and transistor 15 closes. This leads to the fact that the transistor of the electric switch 7 of the charge is closed, and the transistor of the electronic switch 3 is recharged. The control signal at the input of charge unit 2 disappears, and the currents from its first and second outputs stop. At the same time, the recharge current of the load capacitor 8 through the open transistor of the electronic switch 3, recharge, diode 20, the first shoulder 1 of the locking loop 5 begins to flow, so that the voltage of the load capacitor 8 through the second shoulder of the locking loop is applied negatively to the input of the locking node 10, it is reduced there by the magnitude of the voltage drop across the Zener diode 21 and the offset diode 22, and is applied to the input of the block 1I of the pilot signal. Further, the recharge current flows through the resistor 23 of the control signal forming unit 11 to the positive power supply bus + Ufi. The negative voltage applied to the input of the pilot signal generation unit 11 causes the transistor of this unit that is open during the previous half period to close, and high positive potential from its collector is transmitted to the first input of the pulse analyzer 12 - capacitor 24. For all data the parameters of the circuit elements, the duration of the pulse imparted by the unit 11 of forming a control signal to the input of the pulse generator of the analyzer 12 is proportional to the voltage on the load capacitor 8 at the time of the start and its perezg row, i.e. determined parameters lock loop 5. After opening the electronic key 3 for recharging from its first output, diode 25, a control signal is applied to the first input of block 1 of the delay. The delay unit 1 generates a negative pulse of a certain duration, which is fed from its output to the second input of the pulse analyzer 12 — the base of the transistor 26. The pulse analyzer 12 compares the durations of the pulses to its first and second inputs. If the locking loop 5 is normal, the voltage on the load sensor 8 is almost equal to the device supply voltage, the duration of the positive impulse arriving at the first input of the pulse analyzer 12.bolt1pe than the duration of the negative impulse arriving at the second input of this unit, transistor 26 opens and opens the transistor 27. From the collector of the transistor 27, the signal is fed through the separator iodine 28 and the limiting resistor 9 to the base of the transistor 26 and podderivaet it in the open state. A diode 30 and resistor 31 are fed to the signal input of the signaling device 13. The presence of a signal at the input of the signaling device 13 indicates the normal state of the blocking loop. The signal congestion 13 in this case indicates the normal state of the locking loop 5. From the open collector of the transistor 26, a current pulse passes through the resistor 32 to the switching-on unit 9, which generates a control signal, which enters the base of the transistor of the recharge unit and opens it. The recharge block 6 is a controlled current generator. After it is turned on, forced recharging of the load capacitor 8 through the circuit begins: minus the power source - transistor of the electronic key 3 recharge and diode 20 - the first shoulder of the locking loop 5 - the load capacitor 8 of the locking 8 - the second shoulder of the locking loop 5 - the transistor of unit 6 reload yes - resistor 33 - plus power supply. In this case, the diode 22 of the blocking unit 10 prevents the flow of direct current into the control signal generating unit 11. The amplitude value of the recharge current pulse can be selected large enough to form the contacts of the electrocontact sensors included in the interlocking loop 5 in order to reduce their transient resistance to a minimum value. At the same time, the average current flowing through the loop for a period is much less than the amplitude current, which ensures high efficiency of the device for the control of the blocking loop. In the next half-period of operation of the multi-vibrator 4, the transistor of the charging electric key 7 opens again, the overload transistor of the electronic switch 3 closes and the load capacitor 8 charges. The charging process proceeds as described above. The closed transistor of the electronic overload switch 3 breaks the power supply circuit of the pulse analyzer 12, the closed transistors 26, 27, and prepares the pulse analyzer 12 for the next half-period of the device operation. This leads to the termination of the output of signals from both outputs of the pulse analyzer, and, consequently, from the output of block 9 on and the output of block 6 of recharge. However, the signal to the input of the detector 13 continues to arrive until the next half-period of operation 18, supported by the charged capacitor 24, therefore, during this half-period, there is no indication of a violation of the Locking loop. If a violation of locking cable 5 occurs, regardless of the nature of the violation: an increase in the series resistance (or loss), a decrease in leakage resistance in the locking cable 5 (short circuit) or a complex degradation of the parameters of locking cable 5, the amount of negative voltage applied through the locking node 10 to the input of the pilot signal generation unit 11, is sharply reduced. The duration of the pulse coming from the output of the pilot signal forming unit I1 to the first input of the pulse analyzer 12 becomes less than the pulse arriving to the second input of the pulse analyzer 12 from the output of the delay unit 1, therefore, transistors 26 and 27 remain closed. In this case, the signals from the pulse analyzer do not receive signals to the alarm device 13 and the switching on unit 9, there is no forced overcharging of the load capacitor 8. This eliminates the flow of high current pulses in the event of failure of the locking loop 5 in the form of a short circuit of the load capacitor 8, which increases reliability device operation. The absence of a signal at the input of the detector 13 leads to an indication by the warning device 13 of the alarm. The proposed device for alarming has higher technical characteristics compared with the known devices and has the advantages that in the course of work it produces the molding of contacts of security electrocontact sensors, which reduces the contact resistance of these contacts, which prevents false triggering of the device during aging of contact surfaces, sensors, the device allows to reduce the requirement for leakage resistance of the blocking loop, and also allows to ensure the role loop while varying the resistance and the leakage resistance of successive loops and stores the control loop under all combinations of their values. Tests have shown the effectiveness and reliability of the proposed device. The expected economic effect from its implementation will be about 5 thousand rubles. in year. Formula inventions-. An alarm device containing a multivibrator, a blocking loop with electrocontact sensors, a load in the form of a capacitor included at the end of the blocking loop is a signaling device, characterized in that, in order to increase the reliability of the device, beyond the delay block, charge block, block recharge, switch-on unit,: blocking unit, control signal generating unit, pulse analyzer, charge electronic key, electronic key. Perezar, multivibrator outputs are connected to the inputs of the electronic charge keys and Reshere, the first outputs of the electronic key recharge, and the charge unit are connected respectively to the first and second inputs of the delay unit, the second outputs are connected to the first shoulder of the locking cable. About the second shoulder of the locking cable is connected to the output of the rechargeable battery, and the input of the blocking node, the second output of the electronic key of charge is connected to the input of the charging unit, the output of the blocking node is connected to the input of the block forming a control signal, the output of which is connected to the first input of the pulse channel the second input of the pulse analyzer is connected to the output of the delay unit, the third input of the pulse analyzer is connected to the third output of the recharge electronic key, the first output of the pulse analyzer is connected to the input of the switch, the output of which is connected to the unit, restarted, the second output of the pulse analyzer is connected to alarm input. Sources of information taken into account in the examination 1.Patent of Switzerland No. 345569, cl. 74 a 21/01, pub. 1960. 2. USSR author's certificate number 375662, cl. G 08 L 17/00, 1971 (prototype).

Claims (1)

A device for alarming ¹ containing a multivibrator, a lock cable with electrical sensors, a capacitor load included at the end of the lock cable, · a signaling device, characterized in that, in order to increase the reliability of the device, a delay unit, a charge unit, a unit are introduced recharge unit, switch-on unit: blocking unit, control signal generation unit, pulse analyzer, electronic charge key, electronic recharge key, multivibrator outputs are connected to the inputs of electronic charge keys and erezaryada, first outputs of the electronic key overcharging and charging unit respectively connected to first and second inputs of the delay block, the second output - to the first arm lock loop, a second arm lock loop is connected to the output of recharge unit, the first output of the electron-charge key and the entry node blog ₅ kiroki, the second output of the electronic key of the charge is connected to the input of the charge unit, the output of the blocking unit is connected to the input of the control signal generation unit, the output of which is 0 connected to the first input of the pulse analysis jam, the second input of the pulse analyzer is connected to the output of the delay unit, the third input of the pulse analyzer is connected to the third ₁₅ output of the electronic recharge key, the first output of the pulse analyzer is connected to the input of the switching unit, the output of which is connected to the recharge unit, the second output of the pulse analyzer _{20 is} connected to the input signaling device.