An intelligent gas leakage monitoring device and its monitoring method

Abstract

The present invention relates to the technical field of gas leakage monitoring, and specifically discloses a smart gas leakage monitoring device and its monitoring method, including a monitoring housing. Inside the monitoring housing, a detection chamber and a calibration chamber are respectively arranged, and the inside of the calibration chamber is communicated with the inside of the detection chamber through a flow control valve. By comprehensively calculating and analyzing based on the detected gas concentration and the monitored environmental temperature, a two-dimensional coordinate system is constructed and different leakage regions are divided. The ranges of the gas concentration change amount and the environmental temperature change amount corresponding to each region are clarified, and then the gas leakage state coefficient and threshold are obtained. Based on this, the gas leakage state is accurately judged and corresponding signals are generated. On the one hand, the use of multi-parameter comprehensive analysis can effectively reduce misjudgment and improve the accuracy of gas leakage monitoring. On the other hand, the clear regional division and the clear setting of coefficient thresholds can make the monitoring results presented intuitively, facilitating the operator to quickly understand the degree of gas leakage and take corresponding measures in a timely manner.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leakage monitoring, and specifically refers to a smart gas leakage monitoring device and its monitoring method. Background Art

[0002] With the acceleration of the urbanization process, gas is increasingly widely used in people's daily lives and industrial production. However, gas leakage accidents occur frequently, posing a serious threat to life and property safety. Traditional gas leakage monitoring technologies mainly rely on simple gas sensors, which adopt a natural diffusion-based gas collection method and have many defects. In this way, the time for gas to reach the sensor is relatively long. In the initial stage of gas leakage, due to the low gas concentration and slow diffusion, it is often difficult to detect the leakage situation in a timely manner, resulting in delayed alarms and being unable to effectively prevent accidents from occurring.

[0003] Traditional monitoring devices lack an effective monitoring and calibration mechanism for sensor performance. During long-term use, affected by environmental factors, the accuracy of the sensors is prone to decline, resulting in monitoring errors, and false alarms or missed alarms occur frequently, making it difficult to meet the strict requirements of modern gas safety monitoring for accuracy and timeliness. In addition, most gas leakage monitoring devices cannot accurately classify the degree of gas leakage and cannot intuitively reflect the severity of the leakage. This makes it difficult for operators to quickly make accurate judgments and take appropriate countermeasures when faced with complex monitoring data.

[0004] Therefore, we have proposed a smart gas leakage monitoring device. Summary of the Invention

[0005] In view of the above situation, to overcome the defects of the prior art, the present invention provides a smart gas leakage monitoring device and its monitoring method to solve the above-mentioned technical defects.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A smart gas leakage monitoring device includes a monitoring housing. Inside the monitoring housing, a detection chamber and a calibration chamber are respectively arranged, and the inside of the calibration chamber is communicated with the inside of the detection chamber through a flow control valve;

[0007] On the right side inside the detection chamber, an air intake passage is arranged. On the left side inside the detection chamber, an exhaust passage is arranged. On the right side inside the monitoring housing, a micro diaphragm pump is also arranged, and the intake end of the micro diaphragm pump is communicated with the inside of the air intake passage. Inside the air intake passage, a filter rack is arranged, and inside the filter rack, a ceramic filter element is arranged. On the right side of the filter rack inside the air intake passage, an intake air filter screen is fixedly arranged, and a scraping rack is rotatably arranged on the surface of the intake air filter screen;

[0008] The top of the monitoring housing is also provided with an adsorption tank in a threaded manner, and the intake end of the adsorption tank is communicated with the inside of the detection chamber, and the outlet end of the adsorption tank is communicated with the inside of the exhaust passage;

[0009] The inside of the monitoring housing is also provided with a gas leakage monitoring and analysis system, and the gas leakage analysis system includes a gas leakage monitoring and analysis module and a monitoring sensor calibration module.

[0010] Further, an intake cover plate is rotatably provided on the right side of the monitoring housing, and the diameter of the intake cover plate is larger than the diameter of the right end of the intake passage.

[0011] Further, connecting sliding grooves are provided on both the left and right sides of the bottom of the monitoring housing, and connecting frames are slidably provided on the front and rear sides inside the two connecting sliding grooves. Connecting threaded holes are provided above and below the inside of the two connecting frames on the left and right sides, and arc-shaped clamping grooves are provided on the opposite sides of the front and rear two connecting frames. The two connecting frames on the left side and the two connecting frames on the right side are movably connected by connecting screws.

[0012] Further, piezoelectric power generation blocks are provided in the arc-shaped clamping grooves on one side of the four connecting frames, and both sides of the piezoelectric power generation blocks are in contact with the inner wall of the arc-shaped clamping groove and the surface of the gas transmission pipeline respectively.

[0013] Further, the gas leakage monitoring and analysis module, based on the comprehensive calculation and analysis of the gas detection concentration and the monitoring ambient temperature at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device, obtains the gas leakage judgment coefficient for each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device. The specific calculation and analysis method is as follows:

[0014] The gas detection concentration values at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device are obtained in real time through the gas concentration sensor provided in the detection chamber, and the monitoring ambient temperature values at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device are obtained in real time by using the temperature sensor provided in the monitoring housing;

[0015] By calculating the difference between the gas detection concentration values at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device and the normal gas concentration values at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device, the gas concentration change amount at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device is obtained, denoted as ;

[0016] By calculating the difference between the monitored ambient temperature values of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period and the normal monitored ambient temperature values of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period, the ambient temperature change amount of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period is obtained, denoted as 。

[0017] Furthermore, taking the gas concentration change amount of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period as the horizontal coordinate axis and the ambient temperature change amount of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period as the vertical coordinate axis, a two-dimensional coordinate system for analyzing and determining the gas leakage state is generated;

[0018] According to the formula Calculate the gas leakage state coefficient L of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period, Indicates the maximum gas concentration change amount that theoretically appears at each monitoring time point of the intelligent gas leakage monitoring device corresponding to each monitoring period, Indicates the maximum temperature change amount that theoretically appears at each monitoring time point of the intelligent gas leakage monitoring device corresponding to each monitoring period.

[0019] Furthermore, divide the normal area, slight leakage area, moderate leakage area and severe leakage area on the two-dimensional coordinate system for analyzing and determining the gas leakage state. Generate corresponding gas leakage state signals according to the positions of the gas leakage state coefficients of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period on the two-dimensional coordinate system for analyzing and determining the gas leakage state, and generate corresponding alarm signals according to the corresponding gas leakage state signals.

[0020] Furthermore, the monitoring sensor calibration module calculates and analyzes based on the gas detection concentrations of the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period to obtain the sensor calibration coefficients for judging the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period. The specific calculation and analysis method is as follows:

[0021] By calculating the ratio of the standard deviation of the gas detection concentration corresponding to each monitoring period of the intelligent gas leakage monitoring device to the average value of the gas detection concentration corresponding to each monitoring period of the intelligent gas leakage monitoring device, the gas monitoring data stability coefficient corresponding to each monitoring period of the intelligent gas leakage monitoring device is obtained. If the gas monitoring data stability coefficient corresponding to a certain monitoring period of the intelligent gas leakage monitoring device is greater than or equal to the set threshold of the gas concentration monitoring data stability coefficient, it indicates that the monitoring data of the gas concentration monitoring sensor of the intelligent gas leakage monitoring device corresponding to this monitoring period is poor in stability, and calibration processing of the gas concentration monitoring sensor is required to generate a gas concentration sensor calibration signal.

[0022] Further, after receiving the gas concentration sensor calibration signal, the intake passage is closed, and at the same time, the flow control valve connecting the calibration chamber and the detection chamber is opened. The methane standard gas filled inside the calibration chamber enters the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the interior of the detection chamber, wait for the sensor to output stable data. By calculating the ratio of the concentration value of the methane standard gas to the measured value of the standard gas by the sensor, the calibration coefficient of the gas concentration sensor is obtained, and the calibration coefficient is transmitted to the calibration setting module of the gas concentration sensor, so that the gas concentration sensor automatically adjusts its output according to the calibration coefficient to complete the automatic calibration operation of the gas concentration sensor.

[0023] Further, a monitoring method for an intelligent gas leakage monitoring device is applied to the intelligent gas leakage monitoring device, and includes the following steps:

[0024] Step 1: Place the monitoring housing on the pipeline on one side of the gas interface, and use the connecting screw to move the connecting frames on the left and right closer to the front and rear sides of the surface of the gas transmission pipeline until the connecting frames in the front and rear fit the front and rear sides of the gas transmission pipeline, and use the connecting frames in the front and rear to clamp and position the surface of the gas transmission pipeline to complete the fixed installation of the intelligent gas leakage device;

[0025] Step 2: When performing gas leakage monitoring work, open the intake cover plate on the right side of the monitoring housing, and use a micro diaphragm pump to forcibly suck the gas in the surrounding environment into the detection chamber of the monitoring device. The gas entering the detection chamber is first roughly filtered by the intake filter screen, and then finely filtered by the ceramic filter element inside the filter rack. At the same time, the scraping rack is used to scrape the impurities on the outside of the intake filter screen;

[0026] Step 3: The gas detection concentration values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time through the gas concentration sensor set in the detection chamber. At the same time, the monitoring ambient temperature values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time through the temperature sensor set in the monitoring housing. The gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period and the ambient temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are calculated by combining with the normal gas concentration value and the normal monitoring ambient temperature value respectively;

[0027] Step 4: Taking the gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the horizontal coordinate axis and the ambient temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the vertical coordinate axis, a two-dimensional coordinate system for analyzing and determining the gas leakage state is generated. Then, the gas leakage state coefficient L of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period is calculated through the calculation formula;

[0028] Step 5: Divide the normal area, slight leakage area, moderate leakage area and severe leakage area on the two-dimensional coordinate system for analyzing and determining the gas leakage state. According to the position of the gas leakage state coefficient of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period on the two-dimensional coordinate system for analyzing and determining the gas leakage state, the corresponding gas leakage state signal is generated, and the corresponding alarm signal is generated according to the corresponding gas leakage state signal;

[0029] Step 6: By calculating the ratio of the standard deviation value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period to the average value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period, the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to each monitoring period is obtained. If the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to a certain monitoring period is greater than or equal to the set gas concentration monitoring data stability coefficient threshold, it means that the monitoring data stability of the gas concentration sensor of the intelligent gas leakage monitoring device corresponding to this monitoring period is poor, and calibration processing of the gas concentration sensor needs to be carried out to generate a gas concentration sensor calibration signal;

[0030] Step 7: After receiving the calibration signal of the gas concentration sensor, close the intake passage. At the same time, open the flow control valve connecting the calibration chamber and the detection chamber, and let the methane standard gas filled inside the calibration chamber enter the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the interior of the detection chamber, wait for the sensor to output stable data. By calculating the ratio of the concentration value of the methane standard gas and the measured value of the standard gas by the sensor, obtain the calibration coefficient of the gas concentration sensor, and transmit the calibration coefficient to the calibration setting module of the gas concentration sensor, so that the gas concentration sensor automatically adjusts its output according to the calibration coefficient, completing the automated calibration operation of the gas concentration sensor.

[0031] The beneficial effects achieved by the present invention with the above structure are as follows:

[0032] 1. When installing the intelligent gas leakage device of the present invention, it is convenient to fix the monitoring housing on the gas transmission pipeline. The connecting frame can be adjusted according to the pipeline diameter and firmly clamped. At the same time, when the gas transmission pipeline vibrates, the vibration energy is transmitted to the connecting frame through the pipeline wall, causing the piezoelectric power generation block to receive periodic pressure changes, thereby converting the vibration energy into electrical energy. The rectifier and battery set inside the monitoring housing can convert and store the electrical energy for power supply to the low-power components in the intelligent gas leakage monitoring device, realizing the recycling of energy, reducing the dependence on external power sources, and improving the applicability and stability of the device, especially suitable for some monitoring scenarios where it is difficult to lay power lines.

[0033] 2. In the present invention, by setting a gas leakage monitoring and analysis system inside the monitoring housing, the gas leakage monitoring and analysis module performs comprehensive calculation and analysis based on the gas detection concentration and the monitoring environmental temperature, constructs a two-dimensional coordinate system and divides different leakage regions, clarifies the gas concentration change amount and the environmental temperature change amount range corresponding to each region, and then obtains the gas leakage state coefficient and threshold value, so as to accurately judge the gas leakage state and generate corresponding signals. On the one hand, the use of multi-parameter comprehensive analysis can effectively reduce misjudgment and improve the accuracy of gas leakage monitoring. On the other hand, the clear region division and the clear coefficient threshold setting can make the monitoring results presented intuitively, facilitating the operator to quickly understand the degree of gas leakage and take corresponding measures in a timely manner. Whether it is the confirmation of the normal operation state or the discrimination of slight, moderate, and severe leakage situations, it can provide strong and efficient technical support for gas safety guarantee, enhancing the reliability and practicality of the entire intelligent gas leakage monitoring device.

[0034] 3. By statistically analyzing the detected gas concentrations in each monitoring period, the present invention calculates the stability coefficient and compares it with the threshold value, enabling accurate judgment of the data stability of the gas concentration monitoring sensor, timely detection of situations requiring calibration and generation of signals, effectively ensuring the reliability of the sensor data, and reducing the monitoring errors caused by fluctuations in the sensor performance. During the calibration operation, the automated process design, from closing the intake channel, opening the flow control valve to introduce the standard gas, to calculating the calibration coefficient and automatically adjusting the sensor output, not only improves the accuracy and efficiency of calibration, but also reduces the cost and risk of human intervention errors, ensuring that during the long-term operation of the intelligent gas leakage monitoring device, the gas concentration monitoring data always maintains high accuracy and credibility, laying a solid foundation for the accurate monitoring and safety warning of gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0036] Figure 1 is a flowchart of a monitoring method for an intelligent gas leakage monitoring device according to an embodiment of the present invention;

[0037] Figure 2 is a schematic diagram of the structure of an intelligent gas leakage monitoring device according to an embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of the internal structure of the monitoring housing according to an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of the structure of the monitoring housing and the connecting frame according to an embodiment of the present invention;

[0040] Figure 5 is a principle block diagram of the gas leakage monitoring and analysis system in Embodiment 2 of the present invention.

[0041] In the drawings, 1, monitoring housing; 2, intake channel; 3, intake cover plate; 4, intake filter screen; 5, scraping rack; 6, filtering rack; 7, adsorption tank; 8, exhaust channel; 9, connecting chute; 10, connecting frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Embodiment 1

[0044] Please refer to Figures 2 to 4 As shown, a smart gas leakage monitoring device includes a monitoring housing 1. Inside the monitoring housing 1, a detection chamber and a calibration chamber are respectively arranged, and the inside of the calibration chamber is communicated with the inside of the detection chamber through a flow control valve. The inside of the calibration chamber is filled with high-purity methane standard gas, and the concentration of the methane standard gas is known; on the right side inside the detection chamber, an air inlet passage 2 is arranged, and on the left side inside the detection chamber, an exhaust passage 8 is arranged. On the right side inside the monitoring housing 1, a micro diaphragm pump is also arranged, and the air inlet end of the micro diaphragm pump is communicated with the inside of the air inlet passage 2, and the air outlet end of the micro diaphragm pump is communicated with the inside of the detection chamber. By using the micro diaphragm pump to forcibly suck the gas in the surrounding environment into the detection chamber of the monitoring device, compared with the traditional natural diffusion gas collection method, the active suction structure can greatly shorten the time for the gas to reach the sensor, so as to realize the rapid detection and alarm of gas leakage. Especially in the initial stage of leakage, when the gas concentration is low and the diffusion is slow, the advantage is more obvious; inside the air inlet passage 2, a filter rack 6 is arranged, and inside the filter rack 6, a ceramic filter element is arranged. Inside the air inlet passage 2 and on the right side of the filter rack 6, an air inlet filter screen 4 is fixedly arranged, and on the surface of the air inlet filter screen 4, a scraping rack 5 is rotatably arranged. The scraping rack 5 is rotationally driven by a micro motor arranged on the left side of the air inlet filter screen 4. The micro motor is periodically turned on to scrape the impurities outside the air inlet filter screen 4, ensuring the smooth air intake of the smart gas leakage monitoring device and reducing the detection lag or failure caused by poor air intake; on the right side of the monitoring housing 1, an air inlet cover plate 3 is also rotatably arranged, and the diameter of the air inlet cover plate 3 is larger than the diameter of the right end of the air inlet passage 2. The right end of the air inlet passage 2 is closed by the air inlet cover plate 3, so that the monitoring housing 1 can protect the structural components inside the air inlet passage 2 during transportation, preventing damage to the air intake components caused by collision, dust, etc. during transportation, and ensuring the integrity and performance of each component before the device is installed and used;

[0045] Furthermore, on the top of the monitoring housing 1, an adsorption tank 7 is also threadedly arranged. The air inlet end of the adsorption tank 7 is communicated with the inside of the detection chamber, and the air outlet end of the adsorption tank 7 is communicated with the inside of the exhaust passage 8;

[0046] It should be noted that by filling the adsorption tank 7 with adsorbent, when performing the accuracy calibration of the detection sensor, the methane standard gas filled in the calibration chamber enters the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the detection chamber, wait for the sensor to output stable data, and obtain the calibration coefficient of the sensor by comparing the concentration value of the methane standard gas and the measurement value of the standard gas by the sensor. Then, the valve of the methane standard gas is closed to allow the ambient gas to enter the detection chamber. At this time, the methane standard gas inside the detection chamber enters the adsorption tank 7 through the exhaust channel 8, and the methane standard gas is adsorbed by the adsorbent filled in the adsorption tank 7 to prevent the methane standard gas from being discharged into the ambient air and affecting the subsequent gas leakage monitoring results.

[0047] In a specific embodiment, when the present invention performs accuracy calibration of the detection sensor, the methane standard gas inside the detection chamber can enter the adsorption tank 7 through the exhaust channel 8, and the methane standard gas is adsorbed by the adsorbent to prevent the methane standard gas from being discharged into the ambient air and affecting the subsequent gas leakage monitoring results. At the same time, it also meets environmental protection requirements and prevents the leakage of standard gas from causing adverse effects on the surrounding environment.

[0048] Specifically, connecting grooves 9 are provided on the left and right sides of the bottom of the monitoring shell 1, and connecting frames 10 are slidably provided on the front and rear sides of the two connecting grooves 9, connecting threaded holes are provided on the upper and lower parts of the two connecting frames 10 on the left and right sides, and arc-shaped clamping grooves are provided on the opposite sides of the front and rear connecting frames 10, the two connecting frames 10 on the left and the two connecting frames 10 on the right are movably connected by connecting screws, piezoelectric power generation blocks are provided in the arc-shaped clamping grooves on one side of the four connecting frames 10, and the two sides of the piezoelectric power generation blocks are respectively in contact with the inner wall of the arc-shaped clamping groove and the surface of the gas transmission pipeline.

[0049] It should be noted that when installing the intelligent gas leakage device, the monitoring housing 1 is placed on the pipeline on one side of the gas interface. The connecting screw is used to move the connecting frames 10 on the left and right closer to the front and back sides of the surface of the gas transmission pipeline until the connecting frames 10 in the front and back fit the front and back sides of the gas transmission pipeline. The connecting frames 10 in the front and back are used to clamp and position the surface of the gas transmission pipeline, completing the fixed installation of the intelligent gas leakage device. Piezoelectric power generation blocks are arranged in the arc-shaped clamping grooves on one side of the four connecting frames 10. When the gas transmission pipeline vibrates, the vibration energy is transmitted to the connecting frames 10 through the pipeline wall. Since the connecting frames 10 are in close contact with the piezoelectric power generation blocks, this vibration will cause the piezoelectric material to be subjected to periodic pressure changes, thereby effectively converting the vibration energy into electrical energy. At the same time, a matching rectifier and battery are arranged inside the monitoring housing 1. The rectifier is used to convert the alternating current generated by the piezoelectric power generation blocks into direct current, and finally the battery stores the electrical energy for power supply to the low-power components in the intelligent gas leakage monitoring device.

[0050] In a specific embodiment, when installing the intelligent gas leakage device of the present invention, it is convenient to fix the monitoring housing 1 on the gas transmission pipeline. The connecting frames 10 can be adjusted according to the pipeline diameter and firmly clamped. At the same time, when the gas transmission pipeline vibrates, the vibration energy is transmitted to the connecting frames 10 through the pipeline wall, causing the piezoelectric power generation blocks to be subjected to periodic pressure changes, thereby converting the vibration energy into electrical energy. The rectifier and battery arranged inside the monitoring housing 1 can convert and store the electrical energy for power supply to the low-power components in the intelligent gas leakage monitoring device, realizing the recycling of energy, reducing the dependence on external power sources, and improving the applicability and stability of the device, especially suitable for some monitoring scenarios where it is difficult to lay power lines. Embodiment 2

[0051] Please refer to Figure 5 As shown, specifically, the difference between this embodiment and the above Embodiment 1 is that a gas leakage monitoring and analysis system is further arranged inside the monitoring housing 1. The gas leakage analysis system includes a gas leakage monitoring and analysis module and a monitoring sensor calibration module;

[0052] The gas leakage monitoring and analysis module comprehensively calculates and analyzes the gas detection concentration and monitoring environment temperature at each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device to obtain a gas leakage judgment coefficient for each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device. The specific calculation and analysis method is as follows:

[0053] The gas detection concentration values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time by detecting the gas concentration sensor arranged in the chamber. At the same time, the monitoring environment temperature values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time by using the temperature sensor arranged in the monitoring housing 1;

[0054] By calculating the difference between the gas detection concentration values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period and the normal gas concentration values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period, the gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period is obtained, denoted as ;

[0055] By calculating the difference between the monitoring environment temperature values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period and the normal monitoring environment temperature values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period, the environmental temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period is obtained, denoted as ;

[0056] Taking the gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the horizontal coordinate axis and the environmental temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the vertical coordinate axis, a two-dimensional coordinate system for analyzing and determining the gas leakage state is generated;

[0057] According to the formula Calculate the gas leakage state coefficient L of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period, which represents the maximum gas concentration change amount that theoretically appears at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device, and represents the maximum temperature change amount that theoretically appears at each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device;

[0058] The gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period on the two-dimensional coordinate system of the gas leakage state <500 ppm, and the absolute value of the environmental temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period <2 °C area is denoted as the normal area;

[0059] The gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period on the two-dimensional coordinate system of the gas leakage state is 500 ppm < < 5000 ppm, and for the intelligent gas leakage monitoring device, the environmental temperature change amount at each monitoring time point in each monitoring period is -5°C < < -2°C in the area, which is recorded as the minor leakage area;

[0060] On the two-dimensional coordinate system of the gas leakage state, for the intelligent gas leakage monitoring device, the gas concentration change amount at each monitoring time point in each monitoring period is 5000 ppm < < 25000 ppm, and for the intelligent gas leakage monitoring device, the environmental temperature change amount at each monitoring time point in each monitoring period is -10°C < < -5°C in the area, which is recorded as the moderate leakage area;

[0061] On the two-dimensional coordinate system of the gas leakage state, for the intelligent gas leakage monitoring device, the gas concentration change amount at each monitoring time point in each monitoring period > 25000 ppm, and for the intelligent gas leakage monitoring device, the environmental temperature change amount at each monitoring time point in each monitoring period < -10°C in the area, which is recorded as the severe leakage area;

[0062] By substituting the boundary values of the above normal area and minor leakage area into the formula for calculation, the gas leakage state coefficient threshold L1 corresponding to the intelligent gas leakage monitoring device is obtained. If L < L1, it means that there is no gas leakage at each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device, and a normal gas transmission state signal is generated;

[0063] Substitute the boundary values of the above minor leakage area and moderate leakage area into the formula for calculation to obtain the gas leakage state coefficient threshold L2 corresponding to the intelligent gas leakage monitoring device. If L1 ≤ L < L2, it means that there is a minor gas leakage at each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device, and a minor gas leakage state signal is generated;

[0064] Substitute the boundary values of the above moderate leakage area and severe leakage area into the formula for calculation to obtain the gas leakage state coefficient threshold L3 corresponding to the intelligent gas leakage monitoring device. If L2 ≤ L < L3, it means that there is a moderate gas leakage at each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device, and a moderate gas leakage state signal is generated;

[0065] If L ≥ L3, it means that there is a severe gas leakage at each monitoring time point in each monitoring period corresponding to the intelligent gas leakage monitoring device, and a severe gas leakage state signal is generated;

[0066] Among them, an alarm and a wireless communication transmission module are also arranged on the top of the monitoring housing 1. The alarm is controlled by the generated gas leakage status signal to emit a corresponding alarm signal, and at the same time, it is sent to the mobile Internet terminal through the wireless communication transmission module.

[0067] In a specific embodiment, in the present invention, a gas leakage monitoring and analysis system is arranged in the monitoring housing 1. Among them, the gas leakage monitoring and analysis module performs comprehensive calculation and analysis based on the gas detection concentration and the monitoring ambient temperature, constructs a two-dimensional coordinate system and divides different leakage regions, clarifies the gas concentration change amount and the ambient temperature change amount range corresponding to each region, and then obtains the gas leakage status coefficient and threshold value, so as to accurately judge the gas leakage status and generate a corresponding signal. On the one hand, the use of multi-parameter comprehensive analysis can effectively reduce misjudgment and improve the accuracy of gas leakage monitoring. On the other hand, the clear region division and the clear coefficient threshold setting can make the monitoring results presented intuitively, facilitating the operator to quickly understand the degree of gas leakage and take corresponding measures in a timely manner. Whether it is the confirmation of the normal operation state or the discrimination of slight, moderate, and severe leakage situations, it can provide strong and efficient technical support for gas safety guarantee, and improve the reliability and practicality of the entire intelligent gas leakage monitoring device.

[0068] The monitoring sensor calibration module calculates and analyzes based on the gas detection concentration of each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device, and obtains the sensor calibration coefficient for judging the intelligent gas leakage monitoring device corresponding to each monitoring time point in each monitoring period. The specific calculation and analysis method is as follows:

[0069] By performing statistical summation calculation on each monitoring time point in each monitoring period of the intelligent gas leakage monitoring device, the average value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period is obtained. At the same time, the standard deviation calculation formula is used to obtain the standard deviation value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period. By calculating the ratio of the standard deviation value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period to the average value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period, the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to each monitoring period is obtained. According to the type of the used gas concentration sensor, a threshold value for judging the gas concentration monitoring data stability coefficient is set. If the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to a certain monitoring period is greater than or equal to the set gas concentration monitoring data stability coefficient threshold value, it means that the monitoring data stability of the gas concentration monitoring sensor of the intelligent gas leakage monitoring device corresponding to this monitoring period is poor, and calibration processing of the gas concentration monitoring sensor needs to be carried out to generate a gas concentration sensor calibration signal;

[0070] After receiving the calibration signal of the gas concentration sensor, the intake passage 2 is closed, and at the same time, the flow control valve connecting the calibration chamber and the detection chamber is opened. The methane standard gas filled inside the calibration chamber enters the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the interior of the detection chamber, wait for the sensor to output stable data. By comparing and calculating the concentration value of the methane standard gas and the measured value of the standard gas by the sensor, the calibration coefficient of the gas concentration sensor is obtained. The calibration coefficient is transmitted to the calibration setting module of the gas concentration sensor, so that the gas concentration sensor automatically adjusts its output according to the calibration coefficient, completing the automated calibration operation of the gas concentration sensor.

[0071] In a specific embodiment, the present invention statistically analyzes the detected gas concentrations in each monitoring period, calculates the stability coefficient and compares it with the threshold value, can accurately judge the data stability of the gas concentration monitoring sensor, timely discovers the situation that needs to be calibrated and generates a signal, effectively ensuring the reliability of the sensor data and reducing the monitoring error caused by the performance fluctuation of the sensor; during the calibration operation, the automated process design, from closing the intake passage 2, opening the flow control valve to introduce the standard gas, to calculating the calibration coefficient and automatically adjusting the sensor output, not only improves the accuracy and efficiency of calibration, but also reduces the cost and risk of human intervention errors, ensuring that during the long-term operation of the intelligent gas leakage monitoring device, the gas concentration monitoring data always maintains high accuracy and credibility, laying a solid foundation for the accurate monitoring and safety warning of gas leakage. Embodiment 3

[0072] Please refer to Figures 1 to 5 As shown, specifically, a monitoring method for an intelligent gas leakage monitoring device is also proposed in this embodiment, which is applied to the intelligent gas leakage monitoring device in the above Embodiment 1 and 2, and includes the following steps:

[0073] Step 1: Place the monitoring housing 1 on the pipeline on one side of the gas interface, and use the connecting screw to move the connecting frames 10 on the left and right closer to the front and back sides of the surface of the gas transmission pipeline until the front and rear connecting frames 10 fit the front and back sides of the gas transmission pipeline, and use the front and rear connecting frames 10 to clamp and position the surface of the gas transmission pipeline, completing the fixed installation of the intelligent gas leakage device.

[0074] Step 2: When carrying out the gas leakage monitoring work, open the intake cover plate 3 on the right side of the monitoring housing 1, and use the micro diaphragm pump to forcibly suck the gas in the surrounding environment into the interior of the detection chamber of the monitoring device. The gas entering the interior of the detection chamber first undergoes coarse filtration treatment by the intake filter screen 4, and then undergoes fine filtration treatment by the ceramic filter element inside the filter rack 6, while cooperating with the scraping rack 5 to scrape the impurities on the outer side of the intake filter screen 4.

[0075] Step 3: The gas detection concentration values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time through the gas concentration sensor set in the detection chamber. At the same time, the monitoring ambient temperature values of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are obtained in real time through the temperature sensor set in the monitoring housing 1. The gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period and the ambient temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period are calculated by combining with the normal gas concentration value and the normal monitoring ambient temperature value respectively;

[0076] Step 4: Taking the gas concentration change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the horizontal coordinate axis and the ambient temperature change amount of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period as the vertical coordinate axis, a two-dimensional coordinate system for analyzing and determining the gas leakage state is generated. Then, the gas leakage state coefficient L of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period is calculated through the calculation formula;

[0077] Step 5: A normal area, a minor leakage area, a moderate leakage area, and a severe leakage area are divided on the two-dimensional coordinate system for analyzing and determining the gas leakage state. According to the position of the gas leakage state coefficient of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period on the two-dimensional coordinate system for analyzing and determining the gas leakage state, a corresponding gas leakage state signal is generated, and a corresponding alarm signal is generated according to the corresponding gas leakage state signal;

[0078] Step 6: By calculating the ratio of the standard deviation of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period to the average value of the gas detection concentration of the intelligent gas leakage monitoring device corresponding to each monitoring period, the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to each monitoring period is obtained. If the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device corresponding to a certain monitoring period is greater than or equal to the set gas concentration monitoring data stability coefficient threshold, it means that the monitoring data stability of the gas concentration sensor of the intelligent gas leakage monitoring device corresponding to this monitoring period is poor, and calibration processing of the gas concentration sensor needs to be carried out to generate a gas concentration sensor calibration signal;

[0079] Step 7: After receiving the calibration signal of the gas concentration sensor, close the intake passage 2. At the same time, open the flow control valve connecting the calibration chamber and the detection chamber, and allow the methane standard gas filled inside the calibration chamber to enter the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the inside of the detection chamber, wait for the sensor to output stable data. By calculating the ratio between the concentration value of the methane standard gas and the measured value of the standard gas by the sensor, obtain the calibration coefficient of the gas concentration sensor, and transmit the calibration coefficient to the calibration setting module of the gas concentration sensor, so that the gas concentration sensor automatically adjusts its output according to the calibration coefficient, and complete the automatic calibration operation of the gas concentration sensor.

[0080] Meanwhile, the content not described in detail in this specification belongs to the well-known prior art to those skilled in the art.

[0081] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0082] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0083] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An intelligent gas leakage monitoring device, characterized in that, It includes a monitoring housing (1), inside which there are respectively a detection chamber and a calibration chamber, and the inside of the calibration chamber is communicated with the inside of the detection chamber through a flow control valve; On the right side inside the detection chamber, there is an air inlet passage (2), and on the left side inside the detection chamber, there is an exhaust passage (8). On the right side inside the monitoring housing (1), there is also a micro diaphragm pump, and the air inlet end of the micro diaphragm pump is communicated with the inside of the air inlet passage (2). Inside the air inlet passage (2), there is a filter rack (6), and inside the filter rack (6), there is a ceramic filter element. On the right side of the filter rack (6) inside the air inlet passage (2), there is also fixedly arranged an air inlet filter screen (4), and on the surface of the air inlet filter screen (4), there is a scraping rack (5) rotatably arranged; On the top of the monitoring housing (1), there is also a suction tank (7) arranged in a threaded manner, and the air inlet end of the suction tank (7) is communicated with the inside of the detection chamber, and the air outlet end of the suction tank (7) is communicated with the inside of the exhaust passage (8); Inside the monitoring housing (1), there is also a gas leakage monitoring and analysis system, and the gas leakage analysis system includes a gas leakage monitoring and analysis module and a monitoring sensor calibration module; The monitoring sensor calibration module calculates and analyzes based on the gas detection concentrations of the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period, and obtains the sensor calibration coefficients for judging the intelligent gas leakage monitoring device at each monitoring time point in each monitoring period. The specific calculation and analysis method is as follows: By calculating the ratio of the standard deviation of the gas detection concentrations of the intelligent gas leakage monitoring device in each monitoring period to the average value of the gas detection concentrations of the intelligent gas leakage monitoring device in each monitoring period, the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device in each monitoring period is obtained. If the gas monitoring data stability coefficient of the intelligent gas leakage monitoring device in a certain monitoring period is greater than or equal to the set gas concentration monitoring data stability coefficient threshold, it means that the monitoring data stability of the gas concentration monitoring sensor of the intelligent gas leakage monitoring device in this monitoring period is poor, and calibration processing of the gas concentration monitoring sensor is required to generate a gas concentration sensor calibration signal; After receiving the gas concentration sensor calibration signal, close the air inlet passage (2), and at the same time open the flow control valve communicating the calibration chamber and the detection chamber. The methane standard gas filled inside the calibration chamber enters the detection chamber of the sensor at a stable flow rate. After the methane standard gas enters the inside of the detection chamber, wait for the sensor to output stable data. By calculating the ratio of the concentration value of the methane standard gas to the measured value of the standard gas by the sensor, the calibration coefficient of the gas concentration sensor is obtained, and the calibration coefficient is transmitted to the calibration setting module of the gas concentration sensor, so that the gas concentration sensor automatically adjusts its output according to the calibration coefficient to complete the automatic calibration operation of the gas concentration sensor.

2. The intelligent gas leakage monitoring device according to claim 1, wherein: On the right side of the monitoring housing (1), there is also an air inlet cover plate (3) rotatably arranged, and the diameter of the air inlet cover plate (3) is larger than the diameter of the right end of the air inlet passage (2).

3. The intelligent gas leakage monitoring device according to claim 1, characterized in that: The left and right sides of the bottom of the monitoring housing (1) are both provided with connecting grooves (9), and connecting frames (10) are slidably provided on the front and rear sides of the two connecting grooves (9), and connecting threaded holes are provided on the upper and lower sides of the two connecting frames (10) on the left and right sides, and arc-shaped clamping grooves are provided on the opposite sides of the two connecting frames (10), and the two connecting frames (10) on the left and the two connecting frames (10) on the right are movably connected via connecting screws.

4. The intelligent gas leakage monitoring device according to claim 3, characterized in that: A piezoelectric power generation block is arranged in each of the arc-shaped clamping grooves on one side of the four connecting frames (10), and two sides of the piezoelectric power generation block are in contact with the inner wall of the arc-shaped clamping groove and the surface of the gas transmission pipeline respectively.

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