SU24841A1 - Fire Alarm Device - Google Patents

Description

The present invention relates to devices for a fire alarm system with a two-wire loop, in which several detectors are connected in series, giving a certain number of breaks and short-circuits of the loop at the same time as its grounding. In the above-mentioned device, according to the invention, which can operate normally even with a damaged line, in order to receive certain signals at the receiving station, special switches are used, replacing relays with switching devices, which switches are equipped with several ring shapes with rows of contacts and moving along the last brushes that are controlled by two electromagnets.

The drawing shows a diagram of the electrical connections of the device.

A device for a fire alarm system with a two-wire loop consists of a receiving station with several detectors connected in series in the loop. At the receiving station, there are two switches Kj, K, equipped with several ring rows of contacts I, II ... X, XI, along which the brushes move, controlled by the electromagnets M / CI of the MLG RH earthing switch and switch IIi. When current passes through the windings of the electromagnet, the switches move in such a way that: a) when the cable breaks, the brushes move them one step; B) when grounding in two steps with the help of a relay for earthing the relay, connected by means of a circuit of one of the linear wires, whereby both linear wires in this position of the switches are switched to the same battery terminal, c) with an alarm - three or more steps. Morse AM and LM; in this device, depending on the linear relays, they are fitted with auxiliary contacts a, b, c, which are connected to the double-RDS relay so that this circuit closes when one detector closes the circuit and the other opens. In addition, the receiving station is equipped with a system of signaling devices (light bulbs, calls, etc.). The present device can work normally even with a damaged line and does not require manual switches. The operation of the device in certain cases of chain mode is as follows. In the normal position, the linear circuit / has the following current carrying capacity: AB, Winding of electromagnet MK, loop i - Lo, winding of electric motor MKi, contacts C - N, relay RZ, winding of relay PP - LB, 2 (local circuit):

-L MB AM mk.a-b, Mb, AM ,,,

PP a-b, AM, -MB.

The remaining local chains are open.

An interruption of the current in the loop causes the switch / Ci brushes to move to the 2nd position, since circuit I opens and circuit 3 is set: -} - MB, AM, K 1 - 2, / Cj II -2, K 111 - 2 , AM, MB, In the 2nd position of the switchboard is hot (break lamp) AO, the call of damage to the RFP rings. By switching the switch // 1 to the left, the damage indicators are no longer valid and when the loop is restored, circuit 4 closes: -AB, MK, L-L, MK, RZ, K, S. IV-2, - LB; switches move to 5th position; the call of the RFP rings again, after which the switch P is transferred to the right and sets the switches L and Sz to the normal position, which restores circuit I.

When the loop is grounded, in addition to circuit I, circuit 5 is also set: - | - AB, L // c, La earth in the loop, earth in the device, P, KI XI - I contact AB of the RZ, winding of the earthing relay and RZ - AB. If the ground is sufficiently strong, the relay earthing relay operates and the switches are set to the 2nd position. The left part of the loop will be powered by 6:, KI, IV-2, RZ train, MJKi, Ai, earth, P, KI XI - 2-OAB (middle point). The right part of the loop has a chain:, MK, A, land and further, as well as on the left side. The switches are set to the 5th position at which the damage indicators are turned on. As in the case of interruption of the current in the loop by switching the switch / left, the pointers are stopped, and after the grounding is removed, the current through circuit 6 is stopped, and the switches are moved to 4-Q position at which the local circuit of the bell closes, indicating good line status . Restoration of circuit I is made by moving the / 7i switches to the right and setting the switches to the normal position.

When a fire signal is issued, the detector button is pressed, which produces a number of breaks and closures of the loop determined depending on the detector number, and during the last loop it is connected to ground. At the first interruption of the current in the loop, the switches K, K are moved to the 2nd position, with the subsequent closure of the circuit with simultaneous grounding, circuit 7 is performed: -} - АБ, МК, AZ, and the right beam of the loop to the source

the signal of the detector, earth, Uj, KI XI - 2 SAR (middle point) and in the left beam: - AB, K, IV -2, RH iz, MK, L, earth D, K XI-2, SAR. Switches go to the 5th position. At the second interruption of the current, the switches are installed in the 4th position and upon further closing the circuit 7 repeats, causing the switches to switch to the 5th position and closing, circuit 5: AM, MKi AB, K II-5 L :, P -5, MBP and on the other hand - MB, AM, KI III - 5, MKz a-b, K II-5, / Ci II-5, OMB.

At the third interruption of the current, the switches go into position b, in which circuit 5 opens. At the third circuit, the current path in the Morse circuit and in the linear circuit is the same. Switches go to the 7th position. The signals then transmitted from the detector are received by Morse devices, and the springs of the switch electromagnets serve as the pulse contacts in their circuit. The alarm bell is ringing.

When two simultaneous fire signals are sent, except for the circuits described, the first current circuit 9 closes when the first mismatch of the closures and openings is made by the two transmitting signals of the detectors: - {- AB, RDS (double signal relay), К X, АМ б- in, AMi a - b, SAR or + AB ,. RDS, K X, AM b-a, AM c-b, CAB. A double signal relay tripped will receive power from its own contact a-b, in addition, a signal lamp will come on from spring contacts c-d.

A short circuit in the loop does not prevent the correct receipt of a fire alarm, as it is in this case through the ground.

For the revision of the detectors, there is a special „relay of the revision of the RR, which, when the current is lowered. the line releases measles (the switches do not react to such a decrease in the current) and opens the Morse AMi and AM circuit

The subject of the patent. 1. A device for fire alarms that can work normally even with a damaged line using a two-wire loop, in which several detectors are connected in series, giving a specific number upon alarm. disconnections of the loop and its closures with simultaneous grounding, characterized by the application at the receiving station