Indoor gas rapid sampling detection device

Abstract

The utility model relates to air quality monitoring technical field, and disclose a kind of indoor gas rapid sampling detection device, including detection main part and built-in gas collection, detection, data processing, communication and operation control module;Gas collection module is connected by gas path in series by air pump, flowmeter, three-stage filter and ≤10mL injection module, can sequentially remove and quantitatively sample indoor gas particulate matter, organic pollutant and interfering component;Gas detection module measures CO2 using constant-temperature NDIR technology, and reserves hot plug interface to expand H2O, CH4 and five-element weather sensor;Data is stored locally after mainboard filtering and calibration, and is transmitted by 4G;Touch screen and physical button realize seamless switching of local and remote mode.The utility model is small, responds fast, and is convenient to maintain, applicable to laboratory, field and online grid multiple scene rapid screening.

Description

Technical Field

[0001] This utility model relates to the field of air quality monitoring technology, specifically to an indoor gas rapid sampling and detection device. Background Technology

[0002] Currently, whether in environmental monitoring, industrial process control, factory production, hospital diagnosis, or agricultural greenhouse management, there is often a need for rapid and accurate detection of gases in indoor or specific areas. This rapid and accurate detection of gases in indoor or specific areas is necessary to meet the practical needs of timely understanding gas status, avoiding risks, and ensuring target effects in different scenarios.

[0003] Currently, traditional gas detection devices have several limitations, making it difficult to meet the monitoring requirements of diverse scenarios: 1. Existing devices are mostly designed for single detection scenarios. For short-term, multi-point rapid monitoring, large sample volumes are often required, and each detection process is time-consuming, hindering efficient sampling. Furthermore, the lack of high-precision detection capabilities for small sample volumes leads to low data acquisition efficiency. 2. Most devices can only monitor CO2 concentration, failing to simultaneously acquire H2O concentration, meteorological parameters, and other characteristic gas data. This makes it difficult to support intelligent, grid-based gas source tracing analysis and provide complete data support for environmental management decisions. 3. Core sensors are susceptible to environmental temperature fluctuations, leading to unstable temperature in the measuring chamber, causing data drift and decreased accuracy. 4. Existing devices largely rely on local operation and data reading, lacking effective remote monitoring modes. This hinders centralized management of dispersed monitoring points and impedes the construction of large-scale grid-based monitoring networks. To address these issues, we propose an indoor rapid gas sampling and detection device to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this invention is to provide an indoor gas rapid sampling and detection device to solve the problems mentioned in the background art, such as poor adaptability, need for large samples, long time consumption, lack of high-precision detection capability for small samples, inefficient data acquisition, inability to simultaneously acquire other characteristic gas data, difficulty in supporting source tracing analysis and decision-making, weak environmental adaptability, low accuracy, reliance on local operation, lack of remote mode, and difficulty in building large-scale gridded networks.

[0005] This utility model provides the following technical solution:

[0006] An indoor gas rapid sampling and detection device includes a detection body and a gas acquisition module, a gas detection module, a data processing and storage module, a communication module, and an operation control module built into the detection body. The gas acquisition module consists of an air pump, a flow meter, a filter assembly, and an injection module, which are connected in series via a gas connection connector. The filter assembly includes a dust filter, a PTFE filter, and an absorbent filter connected in series along the airflow direction to sequentially remove particulate matter, organic pollutants, and interfering gases. The injection module is a small gas sampling chamber with a quantitative cavity, a nominal volume ≤10mL, and is equipped with an openable and closable solenoid valve for quantitative interception and rapid release of purified gas, enabling short-term, multi-point rapid monitoring. The indoor gas extracted by the air pump is purified through three stages by the filter assembly and then proportionally divided by the flow meter. One part enters the injection module for local small-sample quantitative detection, while the other part directly enters the gas detection module for continuous parameter analysis.

[0007] Preferably, the gas detection module integrates a CO2 detection unit, an H2O detection unit, a five-element meteorological sensor, and a CH4 sensor; the CO2 detection unit and the H2O detection unit are connected to the flow meter output of the gas acquisition module through a gas diversion pipeline, and the five-element meteorological sensor and the CH4 sensor are connected to the power supply and signal circuit board inside the detection body through wires; the CO2 detection unit (31) adopts constant temperature NDIR technology, and its measuring gas chamber is fitted with a PTC constant temperature heating element to maintain a constant temperature in the gas chamber and reduce drift.

[0008] Preferably, the data processing and storage module includes a monitoring motherboard and a local storage unit. The monitoring motherboard has a built-in MCU, which is used to filter, temperature compensate and perform two-point calibration on the raw signal output by the gas detection module, and then write the results to the local storage unit and upload them through the communication module. The local storage unit uses a non-volatile FRAM chip, which supports long-term data storage after power failure.

[0009] Preferably, the communication module includes a 4G module, which is encapsulated and soldered onto the monitoring motherboard and communicates bidirectionally with the remote master station to realize the uploading of detection data, remote calibration, and reception of control commands.

[0010] Preferably, the operation control module includes a touch screen and a control motherboard. The touch screen is embedded in the front surface of the detection body and is electrically connected to the control motherboard through wires. The control motherboard is used to switch between local operation mode and remote monitoring mode, set detection parameters, and trigger the export operation of data in the local storage unit.

[0011] Preferably, the outer shell of the detection body is made of waterproof and flame-retardant ABS material, and the side wall of the outer shell is provided with a gas inlet and an exhaust outlet respectively. The inlet is connected to the gas pump input end of the gas collection module, and the exhaust outlet is connected to the exhaust outlet of the gas detection module through a pipeline to form a closed gas path.

[0012] This utility model has the following beneficial effects:

[0013] 1. The indoor gas detection device of this application has high detection efficiency, with a nominal volume of injection module ≤10mL. Combined with a three-stage filtration and diversion design, it can achieve rapid sampling of small samples, meet the needs of short-term, multi-point monitoring, and solve the problems of large sample size and slow detection in traditional devices.

[0014] 2. The constant temperature design of the CO2 detection unit, the multi-step data calibration of the monitoring motherboard, and the leak-proof structure of the closed gas path ensure data accuracy throughout the entire process from acquisition to detection to processing, avoiding interference from impurities and the effects of temperature drift.

[0015] 3. It simultaneously collects gas composition and meteorological parameters, providing complete data dimensions that can support intelligent traceability analysis and overcome the limitations of traditional devices with single parameters.

[0016] The 4.4G module enables remote data upload and calibration, while the touchscreen supports local operation, catering to both distributed monitoring and field use needs. The module is easily connected via gas connectors and wires, making disassembly and maintenance convenient.

[0017] 5. The waterproof and flame-retardant ABS shell and closed air passage can adapt to complex indoor environments such as humid and dusty conditions, and the equipment is highly durable. Attached Figure Description

[0018] Figure 1 This is an isometric view of the detection body of this utility model.

[0019] Figure 2 This is a block diagram of the overall testing device connection module of this utility model.

[0020] Figure 3 This is a block diagram of the gas acquisition module of this utility model.

[0021] Figure 4 This is a block diagram of the gas detection module of this utility model.

[0022] Figure 5 This is a block diagram of the data processing and storage module of this utility model.

[0023] Figure 6 This is a block diagram of the communication module of this utility model.

[0024] Figure 7 This is a block diagram of the operation control module of this utility model.

[0025] In the diagram: 1. Detection body; 11. Air inlet; 12. Exhaust outlet; 2. Gas acquisition module; 21. Air pump; 22. Flow meter; 23. Filter assembly; 231. Dust filter; 232. PTFE filter; 233. Absorbent filter; 24. Injection module; 3. Gas detection module; 31. CO2 detection unit; 32. H2O detection unit; 33. Five-element meteorological sensor; 34. CH4 sensor; 4. Data processing and storage module; 41. Monitoring motherboard; 42. Local storage unit; 5. Communication module; 51. 4G module; 52. Antenna; 6. Operation control module; 61. Touch screen; 62. Control motherboard. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1 and Figure 2 As shown, an indoor rapid gas sampling and detection device includes a detection body 1 and a gas acquisition module 2, a gas detection module 3, a data processing and storage module 4, a communication module 5, and an operation control module 6 built into the detection body 1. The outer shell of the detection body 1 is made of waterproof and flame-retardant ABS material with an IP54 protection rating. The waterproof and flame-retardant material can adapt to complex indoor environments such as humidity and dust, preventing the equipment from being damaged by moisture or fire. The side walls of the outer shell are respectively provided with a gas inlet 11 and an exhaust outlet 12. The inlet 11 has a built-in dustproof screen and is connected to the input end of the air pump 21 of the gas acquisition module 2. The exhaust outlet 12 is connected to the exhaust outlet of the gas detection module 3 through a pipeline, forming a closed gas path for gas circulation. The closed gas path design can prevent gas leakage during the detection process, ensuring accurate detection data and avoiding indoor air pollution. The detection body 1 is provided with a removable maintenance cover, through which internal components can be replaced (see reference). Figure 1 ).

[0028] The operation control module 6 includes a touch screen display 61 and a control motherboard 62. The touch screen display 61 is embedded in the front surface of the detection body 1 and is electrically connected to the control motherboard 62 via wires. The control motherboard 62 is used to switch between local operation mode and remote monitoring mode, set detection parameters, and trigger the export operation of data from the local storage unit 42. The embedded design of the touch screen display 61 makes operation intuitive and convenient, allowing real-time viewing of detection data and equipment status. The mode switching and parameter setting functions are flexible, meeting both rapid on-site detection and long-term remote monitoring needs, making it suitable for a wide range of scenarios. The touch screen display 61 is connected via a snap-fit ​​structure. The touch screen 61 is embedded in a pre-reserved mounting slot on the front of the outer shell of the detection body 1; the signal end of the touch screen 61 is connected to the control motherboard 62 via an LVDS data cable, and the power supply end is connected to the power output end of the control motherboard 62 via a power cable to realize data transmission and power supply; the control motherboard 62 is an embedded control board, which integrates mode switching buttons, parameter setting buttons and data export buttons. Each button is a waterproof tactile button, embedded in the button hole on the front of the outer shell of the detection body 1, below the touch screen 61; the touch screen 61 is used to display detection data and equipment operating status parameters in real time in local operation mode and remote monitoring mode.

[0029] Please see Figure 2 - Figure 7As shown, the gas acquisition module 2 consists of an air pump 21, a flow meter 22, a filter assembly 23, and an injection module 24. The air pump 21, flow meter 22, filter assembly 23, and injection module 24 are connected in series via a gas connection connector. The filter assembly 23 is used to remove particulate matter, organic pollutants, and interfering gases. The filter assembly 23 includes a dust filter 231, a PTFE filter 232, and an absorbent filter 233 connected in series along the airflow direction. These components sequentially remove particulate matter, organic pollutants, and interfering gases. The dust filter 231 has a built-in glass fiber membrane to remove particulate impurities from the gas. The PTFE filter 232 filters out organic pollutants. The absorbent filter 233 has a built-in alkaline absorbent to adsorb acidic interfering gases, thus achieving gas purification. This three-stage filtration thoroughly removes impurities and interfering components from the gas, preventing any impact on subsequent detection accuracy. The injection module... Module 24 is a small gas sampling chamber with a quantitative cavity, its nominal volume ≤10mL, and is equipped with an openable and closable solenoid valve for quantitative interception and rapid release of purified gas, enabling short-term, multi-point rapid monitoring. The gas pump 21 is used to extract indoor gas. The extracted indoor gas is purified by dust filter 231, PTFE filter 232 and absorbent filter 233, and the flow rate is regulated and controlled by flow meter 22. Then it is delivered through a one-to-two pipe. One pipe enters injection module 24 for local small sample detection, and the other pipe enters gas detection module 3 for gas parameter analysis. The injection module 24 has a nominal volume ≤10mL, which is suitable for small sample detection needs. With the solenoid valve, it can quickly complete multi-point sampling, solving the problem of large sample demand and slow detection in traditional devices. The gas path connector is designed in series, which is convenient for disassembly and assembly. During later maintenance, individual components can be replaced, reducing maintenance costs.

[0030] The gas detection module 3 integrates a CO2 detection unit 31, an H2O detection unit 32, a five-element meteorological sensor 33, and a CH4 sensor 34. The CO2 detection unit 31 and H2O detection unit 32 are connected to the output of the flow meter 22 of the gas acquisition module 2 via a gas diversion pipeline. The five-element meteorological sensor 33 and CH4 sensor 34 are connected to the power supply and signal circuit board inside the detection body 1 via wires. The CO2 detection unit 31 employs constant-temperature NDIR technology, with a PTC constant-temperature heating element attached to the outside of its measuring chamber. A PID temperature control circuit maintains a constant temperature in the chamber, ensuring accuracy. To ensure detection accuracy, the H2O detection unit 32 is a capacitive humidity sensor used to monitor the H2O concentration in the gas in real time; the five-element meteorological sensor 33 is an integrated sensor used to collect temperature, humidity, wind speed, wind direction, and air pressure parameters; the CH4 sensor 34 is a catalytic combustion sensor used to detect the CH4 concentration in the gas; the signal output terminals of the CO2 detection unit 31, H2O detection unit 32, five-element meteorological sensor 33, and CH4 sensor 34 are all electrically connected to the monitoring motherboard 41 of the data processing and storage module 4 through shielded wires to achieve stable transmission of detection data.

[0031] The data processing and storage module 4 includes a monitoring motherboard 41 and a local storage unit 42. The monitoring motherboard 41 is an embedded microcontroller motherboard, and its signal input terminal is connected to the output terminals of each detection unit and sensor of the gas detection module 3 through shielded wires to receive detection data. The monitoring motherboard 41 has a built-in data processing algorithm to filter and temperature compensate and calibrate the received detection data, and then outputs it in two ways. One way is transmitted to the local storage unit 42 through the SPI interface, and the other way is transmitted to the communication module 5 through the UART interface, which forwards it to the remote master station. The local storage unit 42 uses a non-volatile FRAM chip to support long-term data retention after power failure. The control motherboard 62 is electrically connected to the monitoring motherboard 41 of the data processing and storage module 4 through the I2C interface to realize the switching between local operation mode and remote monitoring mode, the setting of detection parameters, and the triggering of data export operation in the local storage unit 42.

[0032] The communication module 5 includes a 4G module 51 and an antenna 52. The 4G module 51 is packaged and soldered onto the monitoring motherboard 41 and communicates bidirectionally with the remote master station to realize the uploading of detection data, remote calibration, and the reception of control commands. The communication module 5 uses the HJ212 protocol, which is common in the environmental protection industry, to interact with the remote master station. The signal end of the 4G module 51 is connected to the antenna 52 via an RF cable. The antenna 52 is embedded inside the outer shell of the detection body 1 to ensure signal stability. The 4G module 51 is used to realize bidirectional real-time data transmission between the device and the remote master station. On the one hand, it uploads the detection data output by the data processing and storage module 4 to the master station. On the other hand, it receives control commands such as parameter configuration and mode switching issued by the master station and transmits them to the data processing and storage module 4.

[0033] Workflow: Place the detection unit 1 in the indoor area to be tested, ensuring that the air inlet 11 is unobstructed. After powering on, select the local operation mode or the remote monitoring mode through the touch display screen 61. If it is a small sample test in the laboratory, select the local operation mode; if it is a long-term monitoring in the greenhouse, select the remote monitoring mode and complete the communication pairing with the remote master station through the 4G module 51.

[0034] When the air pump 21 is started, the indoor air enters the filter assembly 23 through the air inlet 11. It passes through the dust filter 231 to remove dust, the PTFE filter 232 to remove organic pollutants, and the absorbent filter 233 to adsorb acidic interfering gases. The purified gas is then split by the flow meter 22. One part enters the injection module 24, where the solenoid valve is closed to achieve quantitative retention within 10 mL, completing the local small sample detection. The other part enters the gas detection module 3, where the CO2 detection unit 31 (PTC heating element keeps the gas chamber at a constant temperature), the H2O detection unit 32, and the CH4 sensor 34 simultaneously collect gas parameters. The five-element meteorological sensor 33 collects data such as ambient temperature, humidity, and wind speed.

[0035] The MCU of the monitoring motherboard 41 receives signals from each detection unit. After filtering, temperature compensation, and two-point calibration, the data is written to the local storage unit 42 (the FRAM chip ensures that the data is not lost when power is off). At the same time, the 4G module 51 uploads the data to the remote master station. The master station can issue remote calibration commands and adjust the detection parameters through the monitoring motherboard 41. During local operation, real-time data can be viewed through the touch screen 61, or the stored data can be extracted through the data export function of the control motherboard 62.

[0036] If the filter assembly 23 or injection module 24 needs to be replaced, the gas line connector can be directly removed for individual replacement; if the internal module needs to be inspected, the maintenance cover of the detection body 1 can be opened, and the module can be disassembled and assembled through the connection terminals of the wires and the circuit board, which is convenient to operate.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An indoor gas rapid sampling and detection device, comprising a detection body (1) and a gas acquisition module (2), a gas detection module (3), a data processing and storage module (4), a communication module (5), and an operation control module (6) built into the detection body (1), characterized in that: The gas collection module (2) consists of an air pump (21), a flow meter (22), a filter assembly (23), and an injection module (24). The air pump (21), flow meter (22), filter assembly (23), and injection module (24) are connected in series via an air connector. The filter assembly (23) includes a dust filter (231), a PTFE filter (232), and an absorbent filter (233) connected in series along the airflow direction to sequentially remove particulate matter, organic pollutants, and interfering gases. The injection module (24) is a small gas sampling chamber with a quantitative cavity, the nominal volume of which is ≤10mL. It is equipped with an openable and closable solenoid valve for quantitative interception and rapid release of purified gas, so as to realize short-term, multi-point rapid monitoring. The indoor gas extracted by the air pump (21) is purified in three stages by the filter assembly (23), and then the flow meter (22) divides it proportionally. One part enters the injection module (24) to complete the local small sample quantitative detection, and the other part directly enters the gas detection module (3) for continuous parameter analysis.

2. The indoor gas rapid sampling and detection device according to claim 1, characterized in that: The gas detection module (3) integrates a CO2 detection unit (31), an H2O detection unit (32), a five-element meteorological sensor (33), and a CH4 sensor (34). The CO2 detection unit (31) and the H2O detection unit (32) are connected to the output end of the flow meter (22) of the gas acquisition module (2) through a gas diversion pipeline. The five-element meteorological sensor (33) and the CH4 sensor (34) are connected to the power supply and signal circuit board inside the detection body (1) through wires. The CO2 detection unit (31) adopts constant temperature NDIR technology, and its measuring gas chamber is attached with a PTC constant temperature heating element to maintain the constant temperature of the gas chamber and reduce drift.

3. The indoor gas rapid sampling and detection device according to claim 1, characterized in that: The data processing and storage module (4) includes a monitoring motherboard (41) and a local storage unit (42). The monitoring motherboard (41) has a built-in MCU, which filters, compensates for temperature and performs two-point calibration on the raw signal output by the gas detection module (3), and writes the results into the local storage unit (42) and uploads them through the communication module (5). The local storage unit (42) uses a non-volatile FRAM chip, which supports long-term data storage after power failure.

4. The indoor gas rapid sampling and detection device according to claim 1, characterized in that: The communication module (5) includes a 4G module (51), which is encapsulated and soldered onto the monitoring motherboard (41) and communicates bidirectionally with the remote master station to realize the uploading of detection data, remote calibration and the reception of control commands.

5. The indoor gas rapid sampling and detection device according to claim 1, characterized in that: The operation control module (6) includes a touch screen (61) and a control motherboard (62). The touch screen (61) is embedded in the front surface of the detection body (1) and is electrically connected to the control motherboard (62) through wires. The control motherboard (62) is used to switch between local operation mode and remote monitoring mode, set detection parameters, and trigger the export operation of data in the local storage unit (42).

6. The indoor gas rapid sampling and detection device according to claim 1, characterized in that: The outer shell of the detection body (1) is made of waterproof and flame-retardant ABS material. The side wall of the outer shell is provided with a gas inlet (11) and an exhaust port (12). The inlet (11) is connected to the input end of the air pump (21) of the gas collection module (2). The exhaust port (12) is connected to the exhaust outlet of the gas detection module (3) through a pipeline to form a closed gas path.

Images