阅读说明：本技术 一种基于不同海拔高度的气体分析装置 (Gas analysis device based on different altitudes ) 是由 曹立峰 王素卫 于 2020-08-17 设计创作，主要内容包括：本发明公开了一种基于不同海拔高度的气体分析装置,包括主控板、氧气传感器、运算放大电路、压力传感器、六氟化硫传感器。本发明通过设置一个压力传感器,可以自适应不同海拔高度下工作环境,无需要再进行其他方式的校准；本发明根据不同海拔高度下的气压情况,结合气泵在不同气压下的工作流量,调节气泵的工作时长,从而精准的抽取定量的气体,提高了整个系统的精度以及智能性和稳定性；由于在抽气的过程中气压传感器的数值变化相比于不抽气时的数值变化更大,也可以将数值作为辅助工具判断系统是否在正常工作状态。(The invention discloses a gas analysis device based on different altitudes, which comprises a main control board, an oxygen sensor, an operational amplification circuit, a pressure sensor and a sulfur hexafluoride sensor. The invention can be self-adapted to working environments at different altitudes by arranging the pressure sensor without calibrating in other modes; according to the air pressure conditions at different altitudes, the working time of the air pump is adjusted by combining the working flow of the air pump at different air pressures, so that quantitative air is accurately extracted, and the precision, intelligence and stability of the whole system are improved; because the numerical value change of the air pressure sensor is larger in the air extraction process compared with the numerical value change in the air extraction process, the numerical value can also be used as an auxiliary tool to judge whether the system is in a normal working state.)

1. A gas analysis device based on different altitudes is characterized in that: the device comprises a main control board, an oxygen sensor, an operational amplifier circuit, a pressure sensor and a sulfur hexafluoride sensor; the output end of the oxygen sensor is connected to the operational amplifier circuit, the output end of the operational amplifier circuit is connected to the input end of the main control board, the output end of the pressure sensor is connected to the input end of the main control board, and the sulfur hexafluoride sensor is electrically connected to the main control board;

one path of an SCL pin of the pressure sensor is connected to a power supply through a resistor R15, and the other path of the SCL pin of the pressure sensor is connected to the SCL pin of the main control board; one path of the SDA pin of the pressure sensor is connected to a power supply through a resistor R14, and the other path of the SDA pin of the pressure sensor is connected to the SDA pin of the main control board.

2. The different altitude based gas analysis apparatus according to claim 1, wherein: the pressure sensor is BMP 180.

3. A gas analysis apparatus according to claim 2, wherein: the 2 pin and the 3 pin of the pressure sensor are both connected with a power supply, the 7 pin is grounded, and a capacitor C12 is connected between the 2 pin and the 7 pin in series.

4. A gas analysis apparatus according to claim 3, wherein: the operational amplification circuit comprises a connector JP1, and the connector JP1 is connected to the oxygen sensor; the pin 3 of the connector JP1 is connected to the equidirectional input end of the first operational amplifier U1A through an inductor L1, wherein one end of the inductor L1 is connected to the power supply through a resistor R2, and the other end is connected to the power supply through a capacitor C3; the 8 pins of the first operational amplifier U1A are connected with a power supply, one circuit is connected with the power supply through a capacitor C1, and the other circuit is connected with the power supply through a capacitor C2; the reverse input end of the first operational amplifier U1A is connected with a power supply through a resistor R5, one path of the 4 pins is connected with the reverse input end, one path of the 4 pins is connected with the power supply through a capacitor C5, and the other path of the 4 pins is connected with the 1 pin through a resistor R4; the pin 1 of the first operational amplifier U1A is connected to the equidirectional input end of a second operational amplifier U1B, the inverting input end of the second operational amplifier U1B is connected with a power supply through a resistor R6, the pins 7 are connected to the inverting input end through a resistor R3 in one way, and the pins 7 are connected with the power supply through a resistor R3 and a capacitor C6 in one way; and a pin 7 of the second operational amplifier U1B is connected with a resistor R1, one path of the resistor R1 is connected with a power supply through a capacitor C4, and the other path is connected with an OxAdc pin of the main control board.

5. The different altitude based gas analysis apparatus according to claim 4, wherein: the first operational amplifier U1A and the second operational amplifier U1B both use model TLC 4502C.

6. The different altitude based gas analysis apparatus according to claim 5, wherein: still include the air pump, the air pump is connected with the solenoid valve, the solenoid valve electricity extremely the main control board, the exit linkage of air pump has the air chamber, the main control board is located in the air chamber.

7. The different altitude based gas analysis apparatus according to claim 6, wherein: the main control board adopts an STM32L011 chip.

8. The different altitude based gas analysis device according to claim 7, wherein the main control board performs the following steps:

(1) reading the atmospheric pressure a under the current environment through the pressure sensor, and obtaining the working flow Q of the air pump under the atmospheric pressure by combining the flow curve of the air pump under different atmospheric pressures a;

(2) calculating a gas volume V, which is the volume of the gas chamber;

(3) calculating the working time t of the air pump, wherein the working time t of the air pump is the sum of the air pumping time of the air pump and the reaction time of the sulfur hexafluoride sensor, namely,in the formula, V is the volume of the air chamber, Q is the working flow of the air pump under the current air pressure, and T is the maximum reaction time of the sulfur hexafluoride sensor;

(4) and controlling the working time of the electromagnetic valve to be t according to the working time t of the air pump calculated in the previous step, and collecting the air with the volume V in the time t.

Technical Field

The invention relates to gas collection and analysis, in particular to a gas analysis device based on different altitudes.

Background

With the use of a large amount of power equipment, sulfur hexafluoride gas is relatively commonly used in the power equipment; the sulfur hexafluoride gas has no toxicity, but the gas in the equipment and the high-voltage arc act to generate toxic substances, and simultaneously, the sulfur hexafluoride gas in the tank body leaks into the air along with the operation and the aging of the equipment, so that the sulfur hexafluoride gas is harmful to the environment and human bodies.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the gas analysis device based on different altitudes, the gas analysis device can accurately measure and analyze the sulfur hexafluoride at each monitoring point under different altitudes, and has the advantages of stable performance, high precision and low cost.

In order to achieve the technical purpose, the invention adopts the following technical scheme: a gas analysis device based on different altitudes comprises a main control panel, an oxygen sensor, an operational amplification circuit, a pressure sensor and a sulfur hexafluoride sensor; the output end of the oxygen sensor is connected to the operational amplifier circuit, the output end of the operational amplifier circuit is connected to the input end of the main control board, the output end of the pressure sensor is connected to the input end of the main control board, and the sulfur hexafluoride sensor is electrically connected to the main control board;

one path of an SCL pin of the pressure sensor is connected to a power supply through a resistor R15, and the other path of the SCL pin of the pressure sensor is connected to the SCL pin of the main control board; one path of the SDA pin of the pressure sensor is connected to a power supply through a resistor R14, and the other path of the SDA pin of the pressure sensor is connected to the SDA pin of the main control board.

Further, the pressure sensor is BMP 180.

Furthermore, the 2 pin and the 3 pin of the pressure sensor are both connected with a power supply, the 7 pin is grounded, and a capacitor C12 is connected between the 2 pin and the 7 pin in series.

Further, the operational amplification circuit includes a connector JP1, the connector JP1 is connected to the oxygen sensor; the pin 3 of the connector JP1 is connected to the equidirectional input end of the first operational amplifier U1A through an inductor L1, wherein one end of the inductor L1 is connected to the power supply through a resistor R2, and the other end is connected to the power supply through a capacitor C3; the 8 pins of the first operational amplifier U1A are connected with a power supply, one circuit is connected with the power supply through a capacitor C1, and the other circuit is connected with the power supply through a capacitor C2; the reverse input end of the first operational amplifier U1A is connected with a power supply through a resistor R5, one path of the 4 pins is connected with the reverse input end, one path of the 4 pins is connected with the power supply through a capacitor C5, and the other path of the 4 pins is connected with the 1 pin through a resistor R4; the pin 1 of the first operational amplifier U1A is connected to the equidirectional input end of a second operational amplifier U1B, the inverting input end of the second operational amplifier U1B is connected with a power supply through a resistor R6, the pins 7 are connected to the inverting input end through a resistor R3 in one way, and the pins 7 are connected with the power supply through a resistor R3 and a capacitor C6 in one way; and a pin 7 of the second operational amplifier U1B is connected with a resistor R1, one path of the resistor R1 is connected with a power supply through a capacitor C4, and the other path is connected with an OxAdc pin of the main control board.

Further, the first operational amplifier U1A and the second operational amplifier U1B both employ model No. TLC 4502C.

Further, still include the air pump, the air pump is connected with the solenoid valve, the solenoid valve electricity even extremely the main control board, the exit linkage of air pump has the air chamber, the main control board is located in the air chamber.

Further, the main control board adopts an STM32L011 chip.

Further, the main control board executes the following steps:

(1) reading the atmospheric pressure a under the current environment through the pressure sensor, and obtaining the working flow Q of the air pump under the atmospheric pressure by combining the flow curve of the air pump under different atmospheric pressures a;

(2) calculating a gas volume V, which is the volume of the gas chamber;

(3) calculating the working time length T of the air pump, wherein the working time length T of the air pump is the sum of the air pumping time of the air pump and the reaction time of the sulfur hexafluoride sensor, namely T is QV + T, in the formula, V is the volume of an air chamber, Q is the working flow rate of the air pump at the current air pressure, and T is the maximum reaction time of the sulfur hexafluoride sensor;

(4) and controlling the working time of the electromagnetic valve to be t according to the working time t of the air pump calculated in the previous step, and collecting the air with the volume V in the time t.

In conclusion, the invention achieves the following technical effects:

1. the invention can be self-adapted to working environments at different altitudes by arranging the pressure sensor without calibrating in other modes;

2. according to the invention, the gas extraction amount is adjusted according to different altitudes, so that the precision, intelligence and stability of the whole system are improved;

3. the air pressure of the air chamber in the extraction process of the gas has corresponding change, and the difference value of the sensor can be read as the judgment basis for judging whether the system works abnormally.

Drawings

FIG. 1 is a schematic diagram of a hardware implementation provided by an embodiment of the invention;

FIG. 2 is a schematic diagram;

FIG. 3 is a circuit diagram of the operation of the pressure sensor;

FIG. 4 is an operational amplifier circuit diagram;

fig. 5 is a graph showing the flow rate of the air pump at different air pressures.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Example (b):

as shown in fig. 1-2, a gas analysis device based on different altitudes includes a main control board, an oxygen sensor, an operational amplifier circuit, a pressure sensor, and a sulfur hexafluoride sensor. The air pump is connected with an electromagnetic valve, and the electromagnetic valve is used for controlling the air pumping amount of the air pump; the electromagnetic valve is electrically connected to the main control board, the main control board controls the opening and closing of the electromagnetic valve, so that the working time t of the air pump is controlled, the air pumping amount is controlled, the outlet of the air pump is connected with the air chamber, and the main control board is arranged in the air chamber.

In this embodiment, as shown in fig. 2, an output end of the oxygen sensor is connected to the operational amplifier circuit, an output end of the operational amplifier circuit is connected to an input end of the main control board, an output end of the pressure sensor is connected to an input end of the main control board, the sulfur hexafluoride sensor is electrically connected to the main control board, and a communication interface is further disposed on the main control board and used for connecting a signal transmission device (not shown). In the embodiment, the sulfur hexafluoride sensor is of an HTS-SF6 model, and the main control board is an STM32L011 chip.

Further, as shown in fig. 3, in the present embodiment, the pressure sensor is a BMP 180. One path of a 5-pin (SCL pin) of the pressure sensor is connected to a power supply through a resistor R15, and the other path is connected to the SCL pin of the main control board; the 6 pins (SDA pins) of the pressure sensor are connected to a power supply through a resistor R14 on one path, and are connected to the SDA pins of the main control board on the other path. Furthermore, the 2 pin and the 3 pin of the pressure sensor are both connected with a power supply, the 7 pin is grounded, and a capacitor C12 is connected between the 2 pin and the 7 pin in series. In this embodiment, the pressure signal is transmitted to the main control board by using the SCL foot and the SDA foot.

Further, as shown in fig. 4, the operational amplification circuit includes a connector JP1, a connector JP1 is connected to the oxygen sensor 00A-101; the pin 3 of the connector JP1 is connected to the equidirectional input end of the first operational amplifier U1A through an inductor L1, wherein one end of the inductor L1 is connected to the power supply through a resistor R2, and the other end is connected to the power supply through a capacitor C3; the 8-pin of the first operational amplifier U1A is connected with a power supply, one circuit is connected with the power supply through a capacitor C1, and the other circuit is connected with the power supply through a capacitor C2; the inverting input end of the first operational amplifier U1A is connected with a power supply through a resistor R5, one path of the 4 pins is connected with the inverting input end, one path of the 4 pins is connected with the power supply through a capacitor C5, and the other path of the 4 pins is connected with the 1 pin through a resistor R4; the 1 pin of the first operational amplifier U1A is connected to the equidirectional input end of the second operational amplifier U1B, the inverting input end of the second operational amplifier U1B is connected with a power supply through a resistor R6, the 7 pins are connected to the inverting input end through a resistor R3 in one way, and the 7 pins are connected with the power supply through a resistor R3 and a capacitor C6 in one way; the pin 7 of the second operational amplifier U1B is connected with a resistor R1, one path of the resistor R1 is connected with a power supply through a capacitor C4, and the other path is connected with an OxAdc pin of the main control board.

In this embodiment, the model TLC4502C is adopted for both the first operational amplifier U1A and the second operational amplifier U1B.

When analyzing the content of sulfur hexafluoride gas, a pump-suction scheme is usually adopted, and the gas at each monitoring point is pumped into a gas analysis chamber through the composition of an electromagnetic valve and a gas pump, so as to analyze the content of oxygen contained therein and the content of sulfur hexafluoride gas. However, the flow rates of the air pumps at different altitudes are greatly different, so that the volumes of the gases extracted at different altitudes are greatly different, and finally, the oxygen concentration data calculated after passing through the gas analysis chamber generates a large error, thereby affecting the accuracy of the whole system in analyzing the contents of oxygen and sulfur hexafluoride.

According to the invention, the pressure sensor is added on the gas analysis board, namely the main control board, so that the atmospheric pressure in the current environment can be read in real time, then the working flow Q of the gas pump in the current environment is obtained by combining the flow curves of the gas pump under different atmospheric pressures according to the current atmospheric pressure condition, and the reaction time length T of the sulfur hexafluoride sensor and the volume of the gas chamber (the gas is flushed into the gas chamber, namely the volume of the gas) are combined, so that the time length T required by the gas pump to work is calculated, and further the information of each monitoring point can be more accurately read.

The method comprises the following specific steps:

(1) reading the atmospheric pressure a under the current environment, and obtaining the flow Q under the atmospheric pressure by combining the flow curve of the air pump under different atmospheric pressures a, wherein the flow curve is shown in FIG. 5;

(2) calculating the volume V of the gas, namely the volume of the gas chamber;

(3) calculating the working time t of the air outlet pump, wherein the working time t of the air pump is the sum of the air pumping time of the air pump and the reaction time of the sulfur hexafluoride sensor, namely,in the formula, V is the volume of the air chamber, Q is the working flow of the air pump under the current air pressure, and T is the maximum reaction time of the sulfur hexafluoride sensor;

(4) the working time t of the air pump obtained by calculation in the previous step and the working time of the electromagnetic valve are controlled to be t, so that the gas with the volume V can be collected within the time t, the accuracy of the gas volume is ensured, the accuracy of the oxygen concentration is further ensured, and the accurate analysis of the gas content of the sulfur hexafluoride is realized.

In the step (2), the volume V of the air chamber is a fixed parameter, and can be known from the parameters of the used air chamber.

In the step (3), the maximum reaction time T of the sulfur hexafluoride sensor can be known from the specification of the used sensor.

The invention can be self-adapted to working environments at different altitudes by arranging the pressure sensor without calibrating in other modes; according to the air pressure conditions at different altitudes, the working time of the air pump is adjusted by combining the working flow of the air pump at different air pressures, so that quantitative air is accurately extracted, and the precision, intelligence and stability of the whole system are improved; because the numerical value change of the air pressure sensor is larger in the air extraction process compared with the numerical value change in the air extraction process, the numerical value can also be used as an auxiliary tool to judge whether the system is in a normal working state.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.