CO2 leak detection device

Abstract

The utility model relates to a CO2 leak detection device, which comprises an air pump, a first three-way valve, a second three-way valve, a CO2 filter, a CO2 sensor, a temperature and humidity sensor, a control module, a wireless communication module and a power supply module, a first outlet of the first three-way valve is connected with a first inlet of the second three-way valve, a second outlet of the first three-way valve is connected with an inlet of the CO2 filter, an outlet of the CO2 filter is connected with a second inlet of the second three-way valve, an outlet of the second three-way valve is connected with an inlet of the CO2 sensor, and an outlet of the CO2 sensor is connected with an inlet of the temperature and humidity sensor. An outlet of the temperature and humidity sensor is connected with the device air outlet; the control module is electrically connected with the air pump, the first three-way valve, the second three-way valve, the CO2 sensor, the temperature and humidity sensor and the wireless communication module. And the power supply module supplies power to the device. The device can improve the CO2 gas leakage detection precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to a CO2 leak detection device. BACKGROUND

[0002] SF6 usage reduction in the power industry is a main goal of gas insulated substation equipment design for more than ten years, and the industry has put into trial CO2, clean air and other environmental protection gases to replace SF6 gas. Due to the restriction of various conditions such as production process, on-site installation, and poor sealing ring of the gas-filled equipment, gas leakage may be caused, which causes internal pressure drop and leads to equipment tripping, locking and other problems, and even causes operation and maintenance safety accidents of the substation charging equipment. In order to ensure the safety of power production, the leakage detection of the above environmental protection gases is extremely important.

[0003] At present, the environmental protection gas adopts pure CO2 gas or clean air (79% nitrogen and 21% oxygen). The leakage detection of the power department is based on the leakage detection method of SF6 gas. The traditional wrapping method is adopted, and after the gas is filled and wrapped and left for a certain period of time (such as 24 hours), the CO2 gas concentration in the film is measured, and after a certain period of time, the concentration in the film is measured again. According to the difference before and after wrapping, the leaked concentration is determined.

[0004] In the prior art, an external portable CO2 leak detector is generally used, and the measured gas is extracted from the inside for detection when the wrapping film is pierced, but because the air contains about 0.04% (about 400ppm under ventilation, and the concentration will be higher if there are people present) CO2 gas, the sealing requirement of the wrapping film is extremely high, and once the air is mixed, the value of the measured clean air or CO2 gas in the film will change greatly, which seriously affects the detection accuracy, which causes great difficulty in delivery acceptance and subsequent user operation and maintenance. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a CO2 leak detection device, which can improve the precision of CO2 gas leakage detection.

[0006] In order to achieve the above object, the utility model adopts the technical scheme: a CO2 leak detection device, including air pump, first three -way valve, second three -way valve, CO2 filter, CO2 sensor, temperature and humidity sensor, control module, wireless communication module and power module, device air inlet connects air pump import, the air pump export connects the first three -way valve import, the first three -way valve first export connects the second three -way valve first import, the first three -way valve second export connects the CO2 filter import, the CO2 filter export connects the second three -way valve second import, the second three -way valve export connects the CO2 sensor import, the CO2 sensor export connects the temperature and humidity sensor import, the temperature and humidity sensor export connects device air outlet, the control module is connected with air pump, first three -way valve, second three -way valve, CO2 sensor, temperature and humidity sensor and wireless communication module electricity respectively, the power module is the power supply for device.

[0007] Further, the device air inlet is connected with a sampling air guide pipe to collect the gas to be detected.

[0008] Further, the first three -way valve and the second three -way valve are both three -way electromagnetic valves, and the control module is electrically connected with the control signal input ends of the two three -way electromagnetic valves to control the opening and closing and switching path of the two three -way electromagnetic valves respectively.

[0009] Further, the control module includes an MCU controller, a data storage module, a display module and a power supply management module, the MCU controller is electrically connected with the data storage module and the display module to store and display relevant data, the MCU controller is electrically connected with the power supply management module and the power module to convert the power supply voltage of the power module and supply power to the corresponding modules, and the MCU controller is electrically connected with the air pump, the first three -way valve, the second three -way valve, the CO2 sensor, the temperature and humidity sensor and the wireless communication module.

[0010] Further, the CO2 sensor is a CO2 infrared sensor, the control module further includes a preamplifier circuit and an analog-digital conversion circuit, the CO2 sensor is electrically connected with the MCU controller through the preamplifier circuit and the analog-digital conversion circuit in sequence to amplify the NDIR infrared detection signal, and then input the MCU controller through analog-digital conversion.

[0011] Further, the display module is an OLED liquid crystal screen.

[0012] Further, the wireless communication module is a LORA 2.4G wireless module.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a CO2 leak detection device, the device is provided with CO2 filter and humidity transducer, can realize humidity compensation and zero point calibration in the CO2 gas detection process, to improve the accuracy of CO2 gas detection, simultaneously, the device is provided with wireless communication module still, can detect CO2 gas in the built -in of device inside the wrapping film, and the detection data is sent outward through wireless communication, so as to realize built -in type measurement of CO2 gas concentration, further exclude the interference of outside air to detection accuracy, further improve the detection accuracy of CO2 gas. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of CO2 leak detection device of the utility model;

[0015] Figure 2 It is the circuit schematic diagram of CO2 leak detection device of the utility model;

[0016] Figure 3 It is the circuit diagram of preamplifier circuit in the utility model;

[0017] Figure 4 It is the circuit diagram of humidity transducer in the utility model;

[0018] Figure 5 It is the circuit diagram of LORA 2.4G wireless module in the utility model. DETAILED DESCRIPTION

[0019] The utility model will be further explained below combining with the drawings and examples.

[0020] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains.

[0021] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0022] As Figure 1As shown, this embodiment provides a CO2 leak detection device, including an air pump 1, a first three-way valve 2, a second three-way valve 3, a CO2 filter 4, a CO2 sensor 5, a temperature and humidity sensor 6, a control module 7, a wireless communication module 8, and a power module 9. The device's air inlet 10 is connected to the inlet of the air pump 1; the outlet of the air pump 1 is connected to the inlet of the first three-way valve 2; the first outlet of the first three-way valve 2 is connected to the first inlet of the second three-way valve 3; the second outlet of the first three-way valve 2 is connected to the inlet of the CO2 filter 4; the outlet of the CO2 filter 4 is connected to the second inlet of the second three-way valve 3; the outlet of the second three-way valve 3 is connected to the inlet of the CO2 sensor 5; the outlet of the CO2 sensor 5 is connected to the inlet of the temperature and humidity sensor 6; and the outlet of the temperature and humidity sensor 6 is connected to the device's air outlet 11. The device's air inlet 10 is connected to a sampling guide tube 12 to collect the gas to be detected within the membrane. The control module 7 is electrically connected to the air pump 1, the first three-way valve 2, the second three-way valve 3, the CO2 sensor 5, the temperature and humidity sensor 6, and the wireless communication module 8. The power module 9 supplies power to the device.

[0023] In this embodiment, the first three-way valve 2 and the second three-way valve 3 are both three-way solenoid valves. The control module 7 is electrically connected to the control signal input terminals of the two three-way solenoid valves respectively, so as to control the opening and closing of the two three-way solenoid valves and the switching of the passage.

[0024] like Figure 2 As shown, the control module 7 includes an MCU controller 701, a data storage module 702, a display module 703, and a power management module 704. The MCU controller 701 is electrically connected to the data storage module 702 and the display module 703 to store and display relevant data. The MCU controller 701 is also electrically connected to the power supply module 9 via the power management module 704 to convert the power supply voltage of the power supply module 9 and supply power to the corresponding modules. The MCU controller 701 is electrically connected to the air pump 1, the first three-way valve 2, the second three-way valve 3, the CO2 sensor 5, the temperature and humidity sensor 6, and the wireless communication module 8.

[0025] In this embodiment, the CO2 sensor 5 is a CO2 infrared sensor. The control module 7 also includes a pre-amplifier circuit and an analog-to-digital converter circuit. The CO2 sensor 5 is electrically connected to the MCU controller 701 via the pre-amplifier circuit and the analog-to-digital converter circuit in sequence to amplify the NDIR infrared detection signal, and then input it to the MCU controller 701 through analog-to-digital conversion. Figure 3 This is a circuit diagram of the pre-amplifier circuit in this embodiment. The NDIR infrared detector signal is filtered by RC and then amplified by the precision instrumentation amplifier INA826 before being sent to the back-end circuit. The instrumentation amplifier has excellent anti-interference capabilities and can output a stable signal for further amplification by the back-end operational amplifier. After analog-to-digital conversion, the signal is then input to the MCU controller for processing to obtain the detected CO2 gas concentration.

[0026] Figure 4 is the circuit diagram of the temperature and humidity sensor in this embodiment. In this embodiment, the temperature and humidity sensor 6 adopts a high-precision temperature and humidity sensor SHT35, the humidity accuracy of which can reach ±1.5% RH, and the temperature accuracy of which can reach ±0.1°C. By connecting the temperature and humidity sensor 6 in series in the device, the detection result of the CO2 sensor 5 is compensated for temperature and humidity, so as to improve the accuracy of CO2 gas concentration detection.

[0027] During the operation of the device, the gas circuit is switched periodically through the three-way electromagnetic valve 2, 3, so that the device is connected in series with the CO2 filter 4. When the CO2 gas passes through the CO2 filter 4, the CO2 gas is removed after reacting with the CO2 adsorption material in the CO2 filter 4, and the zero point calibration circuit in the control module 7 is used to realize zero point calibration, so as to overcome the influence of zero point drift of the sensor during long-term operation.

[0028] Through the above measures, temperature and humidity compensation and zero point calibration can be realized, so as to reduce the detection error of the device and improve the detection accuracy of the device.

[0029] In this embodiment, the wireless communication module 8 adopts a LORA 2.4G wireless module. Figure 5 is the circuit diagram of the LORA 2.4G wireless module in this embodiment. By adopting the LORA 2.4G wireless module, the device can realize real-time uploading of data. The module is of micro-power and low-power consumption type, and after uploading data, the module enters sleep state, and is awakened again next time. This intermittent operation can effectively reduce the power consumption of the whole machine, and can realize long-term monitoring of leakage value in a period of time.

[0030] In this embodiment, the display module is an OLED liquid crystal screen.

[0031] This embodiment realizes a wireless high-precision CO2 leak detection device which can realize temperature and humidity compensation and zero point calibration. The device is built into the wrapping film, and can accurately measure and upload the internal CO2 gas concentration value periodically to determine whether there is leakage. During operation, the device extracts CO2 gas into the high-precision CO2 sensor 5 by the built-in air pump 1, the control module 7 compensates for the CO2 gas concentration value detected by the CO2 sensor 5 in combination with the temperature and humidity parameters detected by the temperature and humidity sensor 6, to calculate the actual CO2 concentration value, and then uploads it to the control center or APP platform through the LORA 2.4G wireless module 8. The user can analyze the uploaded detection data to determine whether the gas chamber has leakage. In addition, the control module 7 periodically controls the three-way electromagnetic valve 2, 3 to switch the gas circuit, so that the CO2 filter 4 is connected to the working gas circuit, thereby realizing periodic zero point calibration and reducing detection error.

[0032] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application and according to the technical essence of the present application still falls within the protection scope of the technical solution of the present application.

Claims

1. A CO2 leak detection device, characterized by, The device includes a gas pump, a first three-way valve, a second three-way valve, a CO2 filter, a CO2 sensor, a temperature and humidity sensor, a control module, a wireless communication module and a power module, the device air inlet is connected with the gas pump inlet, the gas pump outlet is connected with the first three-way valve inlet, the first three-way valve first outlet is connected with the second three-way valve first inlet, the first three-way valve second outlet is connected with the CO2 filter inlet, the CO2 filter outlet is connected with the second three-way valve second inlet, the second three-way valve outlet is connected with the CO2 sensor inlet, the CO2 sensor outlet is connected with the temperature and humidity sensor inlet, and the temperature and humidity sensor outlet is connected with the device air outlet; the control module is electrically connected with the gas pump, the first three-way valve, the second three-way valve, the CO2 sensor, the temperature and humidity sensor and the wireless communication module respectively; and the power module supplies power for the device.

2. The CO2 leak detection device of claim 1, wherein, The device air inlet is connected with a sampling air guide pipe to collect the gas to be detected.

3. The CO2 leak detection device of claim 1, wherein, The first three-way valve and the second three-way valve are both three-way electromagnetic valves, and the control module is electrically connected with the control signal input ends of the two three-way electromagnetic valves to control the opening and closing and switching of the two three-way electromagnetic valves respectively.

4. The CO2 leak detection device of claim 1, wherein, The control module includes an MCU controller, a data storage module, a display module and a power supply management module; the MCU controller is electrically connected with the data storage module and the display module to store and display relevant data; the MCU controller is electrically connected with the power module through the power supply management module to convert the power supply voltage of the power module and supply power for the corresponding modules; and the MCU controller is electrically connected with the gas pump, the first three-way valve, the second three-way valve, the CO2 sensor, the temperature and humidity sensor and the wireless communication module.

5. A CO2 leak detection device according to claim 4, wherein, The CO2 sensor is a CO2 infrared sensor, the control module further includes a pre-amplifier circuit and an analog-to-digital conversion circuit, and the CO2 sensor is electrically connected with the MCU controller through the pre-amplifier circuit and the analog-to-digital conversion circuit in sequence to amplify the NDIR infrared detection signal and then input the MCU controller through analog-to-digital conversion.

6. The CO2 leak detection device of claim 4, wherein, The display module is an OLED liquid crystal screen.

7. The CO2 leak detection device of claim 4, wherein, The wireless communication module is a LORA 2.4G wireless module.

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