RU2170951C2 - Self-contained fire warning-starting device - Google Patents

Abstract

FIELD: fire-fighting equipment; applicable in detection of high temperature and subsequent starting of automatic means of fire extinguishing, for instance, modules of powder fire extinguishing. SUBSTANCE: device has transducer, light indication unit, starting unit, power supply unit and audible warning device which is combined with light- indication unit, delay unit, control unit and actuating unit. Transducer is made in form of two-level transducer of limiting temperatures via series-connected normally closed and normally open contact pair whose circuit including delay unit-starting unit-actuating unit is connected with power-supply unit, and combined unit of light indication and audible warning device is connected to power-supply unit wit help of control unit in checking of serviceability of device, and by means of normally open pair of contacts of two-level transducer of limiting temperatures, in working regime. EFFECT: higher reliability and safety in use of device and prolonged service life. 2 dwg

Description

 The invention relates to fire fighting equipment and is intended for the detection of high temperature and the subsequent launch of automatic fire extinguishing means, for example, powder extinguishing modules.

 The prototype of the claimed technical solution was a fire alarm-starting device according to a. from. N 999078 (BI N 7, 1983).

 One of the disadvantages of the known device is the lack of a warning signal “attention” preceding the “start” command, by which automatic fire extinguishing means are triggered, which limits the scope of extinguishing means, since safe conditions for their use in rooms with people are not ensured.

 In addition, the known device, when operating as a stand-alone device, has a limited life, since it is power-consuming in standby mode and at the time of start-up, and the power consumption of the stand-alone power source is limited.

 Another disadvantage of the known device is the inability to control the operability of alarm and power units, as well as the integrity of the circuit of the executive body of the fire extinguishing means, which reduces the reliability of the device.

 The objective of the proposed technical solution is to increase the reliability and safety when using the device, while ensuring a longer life in standby mode.

 The problem is solved in that in the fire alarm and start-up device containing two sensors, a switch, a light indication unit, a start-up unit and a power supply unit, an additional siren is introduced, which is combined with a light indication unit, a delay unit, a control unit and an actuating unit, and one of the sensors is made in the form of a two-level limit temperature sensor, in which normally closed and normally open pairs of contacts are connected in series to the electric circuit: power supply unit, executor ny node trigger unit, a delay unit; moreover, when checking the operability of the device, the light indication unit and the sound siren are connected to the power supply unit using the control unit or in the operating mode using a normally open pair of contacts of a two-level sensor.

 Compared with the prototype, the proposed technical solution additionally has a sound annunciator, a delay unit, a control unit and an actuating unit, and one of the sensors is made in the form of a two-level limit temperature sensor, which allows you to give a warning signal prior to start-up. Otherwise, the proposed technical solution connects the blocks and, therefore, the passage and processing of signals; A new circuit diagram makes it possible to monitor operability and reduce power consumption in standby mode.

 All of the above allows us to conclude that the proposed technical solution meets the criterion of "novelty." To increase safety when using the device, an electric circuit was made that does not consume electricity in standby mode and provides warning signals with a guaranteed time delay for the start command, as well as manual control of the operability of the alarm unit, power supply unit, and executive unit. To reduce the consumption current to zero in standby mode and to generate a warning signal “attention” before the “start” command, a two-level temperature limit sensor has been introduced, in which normally-closed contacts are included in a serial electric circuit: its normally open contacts, power supply , executive unit, start block, delay mode switch and delay block. When the temperature of the protected object rises to the first level of limit temperatures, normally open contacts close, and when the temperature rises further, normally closed contacts open when the second level of limit temperatures is reached.

 In order to warn personnel working in the room where the fire extinguishing means is installed, of a fire hazard and to check the operability of the alarm unit, power supply and executive unit, the alarm unit is connected through the executive unit to the power unit, control unit and normally open contacts of the two-level sensor.

 In order to exclude false triggering of the launch block by a signal of normally closed contacts of a two-level sensor, a second sensor is connected in parallel with it, in which normally closed contacts operate at the same temperature.

 Thus, thanks to the described set of features characterizing the device, the reliability and safety of the device are increased, while ensuring a longer life in standby mode, i.e., the claimed technical result is achieved. Such a design of signal-triggering devices is not known in the art; it does not follow directly from the prior art and was not obvious to specialists.

In more detail, the invention is described using the drawings:
FIG. 1 is a block diagram of a device,
FIG. 2 is a circuit diagram of an embodiment of a device.

 The device comprises an autonomous power supply unit 1, a maximum thermal sensor 2, a two-level limit temperature sensor 3, a control unit 4, an actuation unit 5, a delay mode switch 6, a start unit 7, a delay unit 8, and an alarm unit 9.

 In standby mode, in the normal temperature range of the protected room, power is not supplied to the device from the power supply 1 through the normally open contacts of the two-level limit temperature sensor 3. This ensures zero power consumption of the device.

 If the temperature in the guarded room rises until the first level of temperature limits is reached, the normally open contacts of the two-level temperature sensor 3 close and connect the alarm unit 9 to the power supply unit 1, and through it the actuator unit 5. The alarm unit 9 generates warning light-sound signals "attention" , which allows personnel working in the guarded premises to leave the danger zone in advance or take measures to prevent fire.

 With a further increase in temperature, when it reaches the second level of limit temperatures, the normally closed contacts of the two-level limit temperature sensor 3 and the thermal maximum sensor 2, which previously blocked the operation of the start-up block 7, open and, through the delay mode switch 6 and the delay unit 8, provide the start-up unit 7. Delay unit 8 Designed to provide a guaranteed time interval between the attention signal and the start command.

 In rooms where there are no working personnel, using switch 6 you can turn off the delay unit 8. In this case, the “start” command is generated immediately when the second temperature level is reached.

 Control unit 4 operates in manual mode. Upon receipt of the command "control", he connects the alarm unit 9 through the actuating unit 5 to the power unit 1. In the case of a working condition of the power unit 1 and the actuating unit 5, a minimum current flows through the circuit, which ensures the operation of the light-sound alarm 9 and does not allow the actuation unit 5 to operate.

 A self-contained fire alarm-triggering device can be practically implemented, for example, according to the circuit shown in FIG. 2, from components available on the market.

 The power supply 1 consists of a battery GB1; thermal maximum sensor 2 - from a thermal fire detector SK2; two-level temperature limit sensor 3 - from a thermal fire detector SK1; control unit 4 - from the SBI switch; executive unit 5 - from an electric igniter ET1; delay mode switch 6 - from switch SB2; starting block 7 - from transistors VT1, VT2; delay unit 8 - from transistor VT3, resistor R5, capacitor C4; signaling unit 9 - from a DDI trigger, resistors Rl, R2, R3, R4, LED VD1, capacitors C1, C2, C3, acoustic unit BQ1.

 The device operates as follows. In standby mode, at an ambient temperature below the limit temperature of the first level, normally open contacts SK.1.1 of sensor SK1 do not conduct electric current, i.e. GB1 battery is disconnected. When the ambient temperature rises to the first level of limit temperatures, the normally open contacts SK1.2 of the sensor SK1 are closed, and the trigger DD1 is supplied with power from the battery GB1, which ensures the operation of this trigger. On the trigger element DD1.1, resistor R1, capacitor C1, a modulating frequency generator operating at a frequency of ~ 5 Hz is assembled, and through the resistor R1, the closed inputs 1, 2 of the DD1.1 element are connected to the output 3 of this element, and the capacitor C1 is connected to the inputs 1, 2 elements DD1.1 and a common trigger power bus. A 2.5 kHz audio frequency generator is assembled on the trigger element DD1.3, the resistor R3, the capacitor C2, and through the resistor R3 the closed inputs 8, 9 of the DD1.3 element are connected to the output 10 of this element, and the capacitor C2 is connected to the inputs 8, 9 element DD1.1 and a common trigger power bus, and using resistor R3 there is the possibility of changing the audio frequency. To the connected inputs 12,13 of the trigger element DD1.4, signals are output from the output 10 of the trigger element DD1.3, which the element DD1.4 inverts. The acoustic unit BQ1 is connected to the outputs 10, 11 of the trigger elements DD1.3, DD1.4, thereby applying pulses of twice the voltage of the sound frequency to it. Through the resistor R2, the pulses of the modulating frequency are supplied to the sound frequency generator, thereby changing the frequency of the sound. Modulating frequency pulses are fed from output 3 of DD1.1 element to connected inputs 5, 6 of DD1.2 element, inverted and from output 4 of DD1.2 element modulating frequency pulses are fed through resistor R4, which ensures safe current of electric igniter ET1, LED VD1 to electric igniter ET1 At the same time, light signaling and checking the integrity of the electric igniter circuit are carried out.

 The operability of the alarm units, power supply and the integrity of the electric igniter circuit can be checked by the “control” command, while the SB1 switch is manually closed, simulating the operation of the contacts of the first level, and the device operates according to the above scheme.

 With a further increase in the ambient temperature and reaching the second level of limit temperatures, normally closed contacts SK1.1 of the sensor SK1 and the contacts of the sensor SK2 open, that is, the electrical connections of the gate with the source of transistor VT3 and the emitter of transistor VT1 are disconnected with the base of transistor VT2.

 When the contacts of switch SB2 are open, positive voltage is not applied to capacitor C4, low voltage is present at the gate of transistor VT3, and the transistor is closed. When the contacts SK1.1 are opened, the positive voltage potential is applied to the base of the composite transistor VT1, VT2 through the power supply terminal 7 of the trigger DD1, the composite transistor VT1, VT2 opens and the electric igniter ET1 is connected to the battery GB1, thereby ensuring a guaranteed operation current through the electric ignitor ET1.

 When contact SB2 is closed and contact SK1.2 is closed, an electric current flows through the circuit of capacitor C4 and resistor R5. The transistor VT3 opens and blocks the opening of the composite transistor VT1, VT2. The capacitor C4 is charged to the voltage threshold of the transistor VT3 for a certain time interval t, thereby providing a delay signal "start". After the time t has elapsed, the gate of the transistor VT3 has a voltage below the threshold, the transistor VT3 closes and the control of the composite transistor VT1, VT2 is transferred to the 7th output of the trigger DD1. If during time t the temperature of the protected room reaches the limit temperature of the second level, then before time t expires, contact SK1.1 opens, however, the “start” command passes only after time t.

 The implementation of this invention will not cause difficulties, since the inventive device can be made from nodes and components that are commercially available. The proposed device provides reliable and safe operation of powder fire extinguishing modules placed in rooms with working personnel, which indicates its undoubted benefit and effectiveness.

Claims (1)

 An autonomous fire alarm and start-up device containing a sensor, a light indication unit, a start block, a power supply unit, characterized in that it further comprises an audible warning device that is combined with a light indication unit, a delay unit, a control unit and an actuating unit, the sensor is made in the form of a two-level limit temperature sensor, through a series-connected normally closed and normally open pairs of contacts of which the circuit - delay unit - start-up unit - actuating unit - is connected to power, and the combined light indication unit and sound siren are connected to the power supply unit using the control unit when checking the operability of the device and with the help of a normally open pair of contacts of a two-level limit temperature sensor - in operating mode.

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