RU65235U1 - GAS ALARM - Google Patents

Abstract

The utility model relates to atmospheric control means, namely to devices informing about the concentration of combustible gases, in particular methane, and signaling that they have reached the maximum permissible values in the atmosphere of residential and industrial premises. The gas detector contains a measuring circuit with a gas sensor, an autonomous power supply unit and an actuator, and the voltage from the autonomous power supply unit and the voltage measured at the gas sensor from the measuring circuit are fed through an analog switch to an analog-to-digital converter, and then to an arithmetic logical device. To control the supply of voltage from an external power source to an autonomous power supply unit and from an autonomous power supply unit to the measuring circuit with a gas sensor, analog keys are introduced, for this the switched input of one key is connected to an external power source, and its output is connected to an autonomous power unit, switched the input of another key is connected to an autonomous power supply unit, and its output is connected to a measuring circuit. When the voltage measured at the gas sensor from the measuring circuit corresponds to the value signaling the presence of gas, the arithmetic-logic device generates a corresponding signal to the actuator. This technical solution allows to ensure the stability of the parameters of the supplied voltage from the autonomous power supply to the measuring circuit with a gas sensor and significantly reduce the level of energy consumption. 1 ill.

Description

The utility model relates to atmospheric control means, namely to devices informing about the concentration of combustible gases, in particular methane, and signaling that it has reached its maximum permissible values in the atmosphere of residential and industrial premises, using thermocatalytic gas sensors in its design.

It is known "Device for the automatic control of methane and other combustible gases" (RF patent No. 20133565, published on 05.30.94), which contains a thermocatalytic bridge sensor connected to the output of the power supply unit, supplying power to the circuit of the entire device, a unit for calculating the instantaneous gas concentration , a memory unit, a digital display unit, a digital data processing unit for frequency sensors, connected via a common bus to a computing unit, an executive unit and an audible alarm unit.

The disadvantage of this device is the complexity of its manufacture, since it is assembled from a large number of elements of low integration, in addition, the thermocatalytic sensor operates in a continuous mode, which leads to significant energy consumption.

The well-known "Methane signaling device" (RF patent No. 2131601, published June 10, 1999). This device contains a bridge measuring circuit with a methane sensor connected through an analog switch, an analog-to-digital converter with an arithmetic-logic device connected to a storage device and digital-to-analog

converter, battery and threshold level indicator.

However, in the specified device, the sensor operates in continuous mode and consumes significant energy.

The closest analogue (prototype) in terms of essential features is the device described in RF patent No. 2253108, published May 27, 2005. The device contains a measuring circuit including a methane sensor, and an electronic measuring information processing circuit including an analog switch, an analog-to-digital converter , a microcomputer connected to a control unit, a storage device and an interface device with a personal computer, a clock, a power supply unit including a battery and a charger GUSTs. The device contains an alarm block, the operation of which occurs in case of exceeding the maximum permissible gas value in a controlled room.

In this device, as in the devices indicated above, the gas sensor operates in a continuous mode, which leads to significant energy consumption. The autonomy of the device when powered by a battery does not exceed 10 days.

The technical result, to which the claimed technical solution is directed, is to ensure the stability of the supply voltage parameters, which are supplied from the autonomous power supply unit to the measuring circuit with a gas sensor, and to significantly reduce the level of energy consumption by the gas detector.

This is achieved by the fact that in the gas detector, which contains a measuring circuit with a gas sensor, an autonomous power supply and an actuator, and the supply voltage from the autonomous power supply and the voltage measured at the gas sensor, from the measuring circuit,

fed through an analog switch to an analog-to-digital converter, and then to an arithmetic-logic device, analog keys are introduced with control from an arithmetic-logic device to control the supply of voltage from an external power source to an autonomous power supply unit and from an autonomous power supply unit to a measuring circuit, for this, the switched input of one key is connected to an external power source, and its output is connected to an autonomous power supply unit, the switched input of another key is connected to an autonomous power unit Ethan, and its output - to the measuring circuit.

The introduction of an analog key controlled by an arithmetic-logic device into the gas detector, the switched input of which is connected to an external power source, and its output to an autonomous power supply unit, ensures the stability of the voltage parameters supplied from the autonomous power supply to the measuring circuit with a gas sensor by maintaining a given voltage on the autonomous power supply unit.

The introduction of an analog key controlled by an arithmetic-logic device into the gas detector, whose switched input is connected to an autonomous power supply unit and its output to a measuring circuit with a gas sensor, provides a cyclic supply of voltage from an autonomous power supply unit to the measuring circuit, which allows significantly reduce energy consumption by a gas detector.

The utility model is illustrated by the drawing, which shows the structural diagram of the gas detector.

The gas detector contains 1 - measuring circuit with a gas sensor; 2 - analog switch; 3 - analog-to-digital Converter (ADC); 4 - arithmetic logic unit (ALU);

5, 6 - analog keys; 7 - power supply unit; 8 - external power source; 9 - actuator.

The gas contaminant operates as follows. The full cycle of the detector consists of three modes.

Before starting the cycle, the analog keys 5 and 6 are closed. The supply voltage from the independent power supply unit 7 to the measuring circuit with the gas sensor 1 through the key 6 is not supplied.

1. Voltage monitoring mode on the autonomous power supply unit.

The voltage from the power supply unit 7 through an analog switch 2 is supplied to the ADC 3, and then to the ALU 4.

If the supply voltage at the autonomous power supply unit 7 corresponds to a predetermined value, then the ALU 4 does not supply a control signal to the key 5, and the key 5 remains closed.

If the supply voltage on the autonomous power supply unit 7 is lower than the set value, then the ALU 4 supplies a control signal to the key 5.

The control signal corresponding to the measured voltage at the power supply unit, opens the key 5 for supplying voltage from an external power source 8 to the power supply unit 7, and closes it when the power supply voltage at the power supply unit reaches a predetermined value.

2. The mode of supplying voltage to the gas sensor.

When the voltage from the power supply unit 7 is supplied to the ALU 4, the ALU sends a control signal to the key 6.

The control signal corresponding to the measured voltage at the autonomous power supply unit opens the key 6 for supplying power from the autonomous power supply unit 7 to the measuring circuit with gas sensor 1, and then, after a while, closes it.

When the switch 6 is open, the voltage measured at the gas sensor from the measuring circuit 1 is supplied through an analog switch 2 to the ADC 3, and then to the ALU 4.

3. The absence of voltage on the gas sensor.

After closing the key 6, the voltage from the autonomous power supply unit 7 is not supplied to the measuring circuit with the sensor 1, there is no voltage at the gas sensor, and the voltage from the measuring circuit through the analog switch to the ADC and then to the ALU is no longer supplied.

Thus, cyclic voltage is supplied to the measuring circuit with a sensor from an autonomous power supply unit.

When the voltage measured at the gas sensor from the measuring circuit is supplied to the ALU 4 and corresponds to the value signaling the presence of gas, the ALU gives a corresponding signal to the actuator.

The alarm ends the cycle.

Claims (2)

1. A gas detector containing a measuring circuit with a gas sensor, an autonomous power supply, an actuator, the voltage from the autonomous power supply and the voltage measured at the gas sensor from the measuring circuit are fed through an analog switch to an analog-to-digital converter, and then on an arithmetic-logic device, characterized in that analog keys with control from an arithmetic-logic device for controlling the supply of voltage to the pit are introduced into the gas detector from an external power source to an autonomous power supply unit and from an autonomous power supply unit to a measuring circuit with a gas sensor, for this the switched input of one key is connected to an external power source, and its output to an autonomous power supply, the switched input of another key is connected to an autonomous power supply , and its output is with a measuring circuit. 2. The gas detector according to claim 1, characterized in that the actuator is connected to an arithmetic-logic device.