SU1282178A1 - Device for automatic energizing fire suppression equipment - Google Patents

Abstract

The device relates to the field of automation and can be used to signal a change in mode (the appearance of smoke, infrared radiation, temperature rises, etc.) in a protected room in the event of a fire. The device is designed to automatically turn on high-speed fire extinguishing agents. The aim of the invention is to improve the noise immunity and simplify the device. This goal is achieved by normalizing the input signal in amplitude and duration, reducing the likelihood of interference, the magnitude and amplitude of which are simultaneously located at specified intervals. 3 il.

Description

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I The invention relates to automation and can be used to signal a change in mode (appearance of a center, infrared radiation, temperature, etc.) in a protected room in the event of a fire.

The purpose of the invention is to improve the noise immunity and simplify the device. FIG. 1 is a block diagram of the device; in fig. 2 and 3 are timing diagrams for the operation of the device.

The device contains sensors 1 /, J 1l installed on the protected object, elements OR 2 and 3, time relay 4, threshold unit 5, time relay 6, differentiating element 7, 85 single-element 85 element AND 9, HE 10 element, output contactor 11, elements And 12, ..., 12 ", switching elements 13 ,, ..., 13, power source 14, central device

Each sensor consists of a sensing element and an amplifier-converter unit.

The input of the relay 4 time is connected through the elements OR 2 and 3 to the outputs of the sensors 1.

Switching elements 13, ..., 13 „

sensors 1 | In connected to the code of the corresponding element And 12, ..., 12y, one input of each of which is connected to the output of the relay 4 time, and the other input is connected to the output of the corresponding sensor

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The output of the first element OR 2 is connected via a threshold unit 5 to time 6, the output of which is connected to the differentiating element 7, as well as to the one-oscillator 8, the output of which is included in the control circuit of the threshold of all sensors 1, J .., If ,.

The contactor 11 is connected through the element AND 9 to the codes of the differentiating element 7, the one-shot 8 and the element NOT 10. 1

The inputs of the threshold unit 5, the time relay 6 and the one-shot 8 are connected via the second element OR 3 to the input of the time relay 4, the output of which is connected to the element NOT 10, to the malfunction alarm circuit, to one of the inputs of the elements 12 and 12 (, .., 12fj .

In the initial state, when the value of the monitored parameter is below the established level, the output signals are

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all sensors and other elements of the device are absent (except for the output signal of the element NOT 10), and sensors 1 (, ..., 1 f, are continuously powered via normally closed switching elements 13, ..., 13, from the power source 14.

Time relay 4 generates an output signal at a time interval after the input signal arrives at it. Time relay 6 generates an output signal at a time interval G after the input signal arrives at it. The threshold unit 5 generates an output signal only in the presence of an input signal, the amplitude of which lies between two predetermined levels. The differentiating element 7 generates an output signal only when the input signal disappears (the falling edge). The one-vibration 8 when the input signal arrives at it produces an output pulse of duration.

The HE 10 element generates an output signal in the absence of an input signal and does not produce an output signal in the presence of an input signal.

The device for the automatic activation of the fire extinguishing means operates as follows.

If the control parameter (t) is higher than the set limit (Fig. 2a) at times t, one of the sensors triggers — for example, sensor 1 ,, with a threshold setting Y, 5, and at the output that IL 2, a signal appears (( Fig.2Y, which passes through the threshold block 5, configured to pass the output signal of the sensor, the amplitude of which lies between the two preset signals, and iddax. The output signal of the threshold block 5 (Fig. 26) starts the relay 6, producing the output signal after time t . (fig.2g) The output signal of the relay 6 time zatapus: a There is a one-shot 8, producing a pulse with a duration Jj (Fig. 2a) j which at time t enters the sensor threshold control circuit 1,1

and increases the threshold settings of all to the value of Y (Fig. 2aO of the value of the controlled parameter that is significantly higher than that at tj, which causes the output signal to disappear at the time t

312

.sensors 1j with a modified threshold setting Y, as well as the disappearance of the output signal of the OR 2 element (FIG. 2 &), the disappearance of the output signal of the threshold unit 5 (Fig. 2) and the disappearance of the output signal of the time relay 6 (Fig. 22), A pulse appears at the output of the differentiating element 7 (Fig. 2e), and as a result of filling all the inputs of the element 9 at its output, the signal to the contactor 11 is picked up, which is activated, self-blocked and turns on the extinguishing circuit of the fire extinguishing means (Fig. 2g ).

Simultaneously with the triggering of sensor 1 (time t,) the output signal of the element OR 2 through the element OR 3 is fed to the input of relay 4 time, the time delay of which is o, it selects from condition 7, (Cj + D,). Since the signal at the input of time relay 4 is measured through time + 6, i.e. before time t, then the output signal of time relay 4 is absent (Fig. 2i), and the output signal of the element HE 10 is constantly fed to the input of the element AND 9.

The duration of the output pulse of the one-shot 8 constitutes a fraction of a second and is chosen based on the time required for the tuning of the threshold of the sensor and the removal of its output signal.

Adjustment of the pickup threshold can be accomplished by various methods, for example, by turning off the output signal of the sensing element / thermocouple, photocell / from the amplifying device of the sensor or decreasing the sensitivity of the sensor amplifier by changing the reference voltage or bypassing one of the arms of the measuring bridge circuit, etc.

When any sensor fails, accompanied by the formation of an output signal, for example, sensor 1 at the output of the element OR 2 at time t, a signal appears (Fig. 3f), which passes through the threshold unit 5 and starts the time relay 6, producing the output signal through time (fig. 3 b). The output signal of time relay 6 triggers a one-shot 8, producing a pulse of duration o (Fig. 3l), which at time t enters the circuit.

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control thresholds for sensors 1 ,, ...,% and increases the threshold settings of all sensors to Y (Fig. 3A), however, failed sensor 1 (does not respond to re-setting the threshold and-after a time interval about the output signal of the failed sensor l disappears (Fig. 3 &). At the end of the time C j, the output signal of the one-shot 8 disappears, prohibits the passage of any signals through the And 9 element and returns the threshold settings of all sensors to the initial state Y, (Fig. 3a).

Simultaneously with the appearance of the output signal from the faulty sensor (moment t) the output signal of the element OR 2 through the element OR 3 starts the time relay 4, which generates the output signal through time C, (fig.Za). When the output signal appears, the relay 4 times from the element code And 12, due to the filling of both its inputs, a signal is inputted to the prohibitive input of the switching element 13, which opens the power supply circuit of the faulty sensor 1 (Fig. Ze), thereby removing signals from the outputs of the OR 2 and 3 terminals of the threshold unit .5, returningJust 4 times and the relay 6 are reset to the initial state, its output signal disappears and at the output of differentiating element 7 a pulse appears (Fig. 3) tf), which does not pass through And 9, because there is no output signal of the one-shot 8 (Fig. .).

Thus, in the device, any faulty sensor 1., ..., 1 is automatically disconnected when it is falsely triggered, while the device remains operable from the remaining healthy sensors.

When a failure occurs, which is accompanied by a false triggering of any of the elements of the central device 15, for example, the threshold block 5 of the time relay 6, the one-shot 8. Or the time relay 4, the fault signal 6 is automatically turned on, and the output of the HE 10 element disappears. , prohibit the passage of any signals through the element And 9 to the output device.

Thus, the device provides automatic disconnection of the output circuit in the event of a malfunction of the central device elements.

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When a conductor is closed, the cable connecting the sensor and the central device, for example, when a voltage is applied

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the output circuit of the output signal of the element OR 2 will not pass through the threshold unit 5 due to the difference in the level of the supply voltage from the output signal of the sensor, while the relay 4 time through time C disconnects the supply circuit of the faulty sensor (cable).

As can be seen, the proposed device provides selectivity in amplitude and duration of the input signal. The input signal passed by the device must be normalized on both sides both in amplitude and in duration and must simultaneously satisfy two conditions:

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where and 9 is the amplitude of the input signal — the duration of the input sig

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UMOX lower and upper thresholds for threshold unit 5;

. l shutter speed relay 6 time; - the duration of the output signal

This provides a good noise immunity of the device due to the low probability of occurrence of noise, the amplitude and duration of which simultaneously lie at specified intervals.

Claims (1)

Invention Formula A device for automatically switching on fire extinguishing agents, comprising sensors, the outputs of which are connected to the corresponding inputs of the first element.e.nta OR, the output of which. 0 five five five 78.6 .connected to the first input of the second, OR element, the output of which is connected to the input of the first time relay, the output of which is connected to the first, inputs of the AND elements of the group and is and ;; device formation output, the output of each AND element of the group is connected to the inverse input the corresponding switching element, the output of each of which is connected to the first input of the corresponding sensor, the power source, the output of which is connected to the direct input of each switching element, an output contactor, the output of which is Equal output of the device, characterized in that, in order to increase the noise immunity and simplify the device, a second time relay, AND element, threshold unit, differentiating element, one-shot and NOT element are entered into it, the output of each sensor is connected to the second input of the corresponding AND group element , the output of the first element OR is connected to the input of the threshold unit, the output of which is connected to the second input of the second element OR and to the input of the second time relay, the output of which is connected to the third input of the second element OR, to the input I will give a differentiating element and a one-shot, the output of a differentiating element is connected to the first input of the element AND, the output of the one-shot is connected to the second input of the element AND, to the second input of each sensor and to the fourth input of the second element OR, the output of the first time relay is connected to the input of the element NOT and to the third the input element And, the output of which is connected to the input of the output contactor, the output of which is the controlling output of the device. FIG. one fy. I .3