RU2666324C2 - Gas leakage automatic detection and control system - Google Patents

Abstract

FIELD: alarm system.SUBSTANCE: invention relates to alarm systems that can produce sound or light signals. In the method, the automatic gas leakage detection and control system, including a detection unit, comprising a microcontroller with sensors of monitored parameters and a transmitter, an audible alarm device and an emergency valve associated with the microcontroller, as well as a detection unit, is provided with a sensor for monitoring the presence of odorant concentration, and a differential pressure sensor that is installed in the exhaust ventilation zone and is connected to the microcontroller, designed to calculate the concentration of controlled gases and odorant and compare it with the level of admissible concentrations of controlled gases for the output of the signal in the event of deviation from the permissible values.EFFECT: technical result consists in increasing the reliability of information about the emergency situation.6 cl, 2 dwg

Description

The invention relates to alarm systems with the supply of sound or light signals in the presence of smoke or gases, and in particular to systems that produce continuous automatic control of the level of gas contamination of a room and blocking the gas supply pipeline in the event of an emergency.

A known gas contamination control system comprising two gas contamination signaling devices, an electromagnetic gas shut-off valve, an alarm and control unit and a dispatching control unit, the dispatching control panel and all gas-contamination signaling devices are connected to the signaling and control unit via a radio channel, and a gas shut-off valve is connected to the unit signaling and control using a wired communication line. The system contains additional gas shut-off valves connected via a wired communication line with gas detectors. The gas detector contains a power supply and a microcontroller connected to the power supply, a gas detector, a light and sound alarm module, a radio channel information exchange module, a valve control module, a module for selecting a network address for a gas detector, while the microcontroller is connected to a gas detector, a light and sound indication, the module for the exchange of information on the radio channel, the valve control module for the shut-off valve and the module for selecting the network address of the signaling device Hovhan (See. Patent № RU 85718, IPC G08B17 / 10, publ. 10.08.2009.).

A device for controlling the concentration of hazardous gases containing methane, carbon monoxide and oxygen sensors, a signal amplifier, an analog switch, an analog-to-digital converter, a microcomputer, a storage device, an information board, an alarm device, an interface device with a personal computer, a control device, a watch and a power supply, wherein each sensor is made in the form of a semiconductor gas sensor and through a series-connected signal amplifier, an analog switch a torus and an analog-to-digital converter is connected to a microcomputer, the outputs of which are connected respectively to the inputs of a storage device, an information board, an alarm device, an interface device with a personal computer and a control device, the outputs of the control device are connected respectively to the inputs of an analog switch and an analog-to-digital converter, and the output of the clock is connected to the input of the microcomputer, the device is equipped with three relays, a multivibrator, a transmitter and a remote control point moreover, the relay windings are connected to the corresponding outputs of the microcomputer, the transmitter is made in the form of serially connected master oscillator, phase manipulator, the second input of which is connected to the output of the modulating code generator, telegraph key, power amplifier and transmitting antenna, the transmitter and multivibrator are connected through the make contact of the first relay to the power supply, the make contact of the second relay is connected in series with the resistor to one of the arms of the multivibrator, the make contacts of the third relay and relay m the vibrator are connected in parallel with the telegraph key of the transmitter, the remote control point is made in the form of a receiving antenna, a high-frequency amplifier, a mixer, the second input of which is connected through the local oscillator to the output of the tuning block, intermediate-frequency amplifier, phase doubler, second spectrum analyzer, comparison unit, second the input of which is connected through the first spectrum analyzer to the output of the intermediate frequency amplifier, a threshold block, the second input of which is through the delay line inen with its output, a key, the second input of which is connected to the output of the intermediate frequency amplifier, phase detector and registration unit, a phase divider into two and a narrow-band filter, the output of which is connected to the second input of the phase detector, is connected to the output of the threshold block to the output of the phase doubler the buzzer and tuning block are connected (see Patent No. RU 2411511, IPC G01N27 / 12, publ. 02/10/2011).

A disadvantage of the known device is a large number of control elements in logic circuits, which reduces the reliability of the device as a whole.

The closest set of essential features is a gas emergency device, including a detection unit with a temperature sensor, the detection unit additionally contains a single-crystal microprocessor connected to a temperature sensor, smoke sensor, sound speaker and radio transmitter circuit, made in such a way that when the gas supply is not blocked and causes incessant burning, temperature increase or smoke, the radio transmitter circuit generates a radio signal; wherein the emergency gas device further includes a control unit comprising a radio receiver circuit and an electromagnetic valve connected to the radio receiver circuit, wherein the electromagnetic valve comprises a gas inlet connected to the gas hose and a gas outlet connected to the gas supply hose to the gas stove, the radio circuit is configured to receive a radio signal from the radio transmitter circuit of the detection unit and activate the electromagnetic valve to shut off the gas supply (patent No. RU131887, IPC G08B19 / 00, о publ. August 27, 2013).

All known technical solutions do not take into account the rate of air exchange, which has a critical effect on the level of gas concentration.

The task is to create a system for automatic detection and control of gas leakage providing reliable information about the emergency.

The technical result is achieved due to the fact that the system of automatic detection and control of gas leakage, including a detection unit containing a microcontroller with sensors of controlled parameters and a transmitting device, an audible alarm device and an emergency valve associated with the microcontroller, is additionally equipped with a differential pressure sensor associated with a microcontroller and installed in the exhaust ventilation zone, and the detection unit is equipped with a sensor for monitoring the presence of an odorant concentration.

The detection unit can be placed autonomously in a separate housing, or it can be placed as part of a consumption device or gas meter. The detection unit contains sensors for monitoring gas, carbon monoxide and smoke. The emergency valve is protected against unauthorized activation. The transmitting device is configured to alert the emergency service and SMS alerts to the owner of the object.

The supply of the system with a differential pressure sensor installed in the exhaust ventilation zone made it possible to calculate the air exchange rate in the room, thereby correcting the readings of all sensors, as well as the presence of a sensor for monitoring the presence of odorant concentration, made it possible to provide timely and reliable notification of gas leakage.

All the features of the formula in conjunction with the dependent paragraphs are aimed at solving the problem.

Of the scientific and technical literature and patent documentation, the claimed system of automatic detection and control of gas leak is not known. Thus, the claimed technical solution meets the criteria of "inventive step" and "novelty."

The claimed invention is illustrated by drawings:

FIG. 1 - installation diagram of a system for automatic detection and control of gas leakage;

FIG. 2 is a diagram of a detection unit.

A system for automatically detecting and monitoring a gas leak, including a detection unit 1, an audible alarm device 2, an emergency valve 3, and a differential pressure sensor 4.

The detection unit 1 contains a microcontroller 5 connected to a gas sensor 6, a carbon monoxide sensor 7, a smoke sensor 8, a sensor 9 for monitoring the presence and concentration of an odorant and a transmitting device 10. The detection unit 1 is independently located in a separate housing. The detection unit 1 can be placed as part of a consumption device or a gas flow meter. The microcontroller 5 can be performed with a function of counting time or connected with a time calculation unit (not shown) located in the detection unit 1 .

The sound alarm device 2 and the emergency valve 3 are connected to the microcontroller 5.

An emergency valve 3 is mounted in a gas pipe in front of the gas filters. The emergency valve 3 is electromagnetic, capable of automatically closing. In this case, information about this should be accumulated in the memory of microcontroller 5. Emergency valve 3 is protected from unauthorized switching on. Resumption of gas supply is carried out in manual mode.

The differential pressure sensor 4 is installed in the exhaust ventilation zone of the room and is connected to the microcontroller 5.

The system for automatic detection and control of gas leakage is as follows.

The microcontroller 5 receives information from the differential pressure sensor 4 and calculates the level of permissible concentrations of monitored gases and odorant at each time point, taking into account the rate of air exchange per cubic meter of the room and compares it with the data received from sensors 6, 7, 8, 9 of the monitored parameters, including by metering the gas flow rate (gas meter) and calculates the allowable concentration level controlled gas and the odorant at each time given ventilation rate, and outputs Sig L is output. At the output, you can get a light indication, where green means - within normal limits, yellow - there is emission, you must contact the technical service, and red - emission is critical.

Depending on the volume of gas consumed per unit time, the microcontroller 5 compares the actual amount of odorant in the room received from the sensor 9 for monitoring the presence and concentration of the odorant with the information received from the gas sensor 6 and the calculated rate of air exchange of the room received from the differential pressure sensor 4.

When the concentration of odorant and gas in the room is higher than the permissible value fixed for more than 20 seconds continuously, a control signal is supplied to the emergency valve 3 to shut off the gas and the emergency service is alerted.

When the concentration of the odorant in the room is less than the permissible value, and the gas concentration is higher than the permissible value recorded for more than 20 seconds continuously, a control signal is sent to the emergency valve 3 to shut off the gas and a signal is sent to the service organization (gas service) with information about the deviation of the quality of gas odorization from the required GOST parameters.

When the concentration of the odorant in the room is higher than the permissible value, and the gas concentration is lower than the permissible value recorded for more than 30 minutes continuously, the control signal to the emergency valve 3 is not supplied, due to the absence of danger, but a signal is sent to the service organization (gas service) with information about the deviation of odorization quality gas from the parameters required by GOST.

If the concentrations of odorant and gas in the room are normal - the system is inactive.

When a gas leak occurs, the gas sensor 6 is set to zero gas concentration in the room, captures the actual gas concentration value and transmits it to the microcontroller 5. The microcontroller 5 compares the obtained gas pollution value with the maximum permissible value. If the gas concentration exceeds the maximum allowable in accordance with GOST 12.1.005, the microcontroller 5 records the event in the system memory.

When the ventilation is less than 100%, the system adds 10% in each cycle and checks if the gas concentration has decreased. This is done so as not to announce a false emergency in case of an accidental temporary increase in gas concentration in the room.

When the ventilation is at 100%, the system fulfills the "Alarm" event, that is, the emergency valve 3 is closed and the gas supply to the consumption devices is stopped, the sound alarm device 2 is turned on and the transmitting device 10 notifies the emergency service (AC). If necessary, the transmitting device 10 notifies the owner of the object (for example, SMS notification).

After eliminating the emergency, gas supply is resumed by maintenance personnel using the manual drive of the emergency valve 3.

In the event of an emergency when the concentration of carbon monoxide or smoke is exceeded, the system works similarly to the above.

The inventive system of automatic detection and control of gas leaks is industrially applicable and can be manufactured on standard equipment using modern materials and technologies.

Claims (6)

1. A system for automatically detecting and monitoring a gas leak, including a detection unit comprising a microcontroller with sensors of controlled parameters and a transmitting device, an audible alarm device and an emergency valve associated with the microcontroller, characterized in that the detection unit is equipped with a sensor for monitoring the presence of an odorant concentration, and also installed in the exhaust ventilation zone of the differential pressure sensor connected to the microcontroller, configured to calculate the concentration of controlled gases and odorant at each moment of time, taking into account the frequency of air exchange per cubic meter of the room and comparison with the level of permissible concentrations of controlled gases to give a signal when the tolerance is deviated. 2. The system according to claim 1, characterized in that the detection unit is located as part of a consumption device or gas meter. 3. The system according to claim 1, characterized in that the detection unit contains sensors of controlled parameters, namely: gas, carbon monoxide, smoke. 4. The system according to p. 1, characterized in that the emergency valve is made with a manual actuator, protected from unauthorized switching on and ensuring the resumption of gas supply. 5. The system according to claim 1, characterized in that the transmitting device is configured to alert the emergency service. 6. The system according to p. 1, characterized in that the transmitting device is configured to CMC-alert the owner of the object.

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