Indoor air formaldehyde emission detection device

Abstract

The invention discloses an indoor air formaldehyde emission detection device, and belongs to the technical field of formaldehyde detection. The indoor air formaldehyde detection system comprises an intelligent control digital display touch platform used for man-machine interaction control of an indoor air formaldehyde detection device, and the intelligent control digital display touch platform is in communication connection with a split type gas collection module used for collecting indoor multi-point original data in real time; a gas parameter induction and preliminary screening module; according to the invention, limitation of single-point detection is overcome through split type multi-point acquisition, indoor formaldehyde space distribution can be truly reflected, and the gas parameter induction and preliminary screening module performs strict pretreatment, verification and statistical analysis; a reliable and structured data set abnormal parameter risk analysis module rich in preliminary environment information is provided for a subsequent module to accurately identify standard exceeding, abnormal points and current risks; and a closed loop of acquisition-processing-analysis-prediction-decision-feedback is constructed, so that the comprehensiveness, predictability and initiative of formaldehyde detection are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of formaldehyde detection, in particular to a device for detecting formaldehyde release in indoor air. Background Art

[0002] Formaldehyde is a colorless organic compound with a strong pungent odor. As one of the main pollutants in indoor environments, its hazards cannot be underestimated. Long-term exposure to an environment containing formaldehyde will pose a serious threat to human health. At the mildest, it may cause symptoms such as eye stinging, throat discomfort, and skin allergies. At the worst, it may cause respiratory diseases, gene mutations, and even induce cancer. Especially in newly renovated houses, office spaces and furniture-intensive areas, due to the widespread use of formaldehyde-containing adhesives in building materials, decoration materials and furniture panels, it has become a common phenomenon for indoor formaldehyde emissions to exceed the standard. Therefore, it is very important to accurately and timely detect the formaldehyde emission in indoor air.

[0003] Most existing indoor formaldehyde detection systems are single-point detection systems, which cannot fully reflect the distribution of formaldehyde concentrations in different areas of the room, and it is difficult to achieve long-term continuous monitoring and early warning of formaldehyde emissions. Therefore, the development of a detection system that can quickly, accurately, in real time and comprehensively detect indoor air formaldehyde emissions, and has the characteristics of high stability and easy operation, has become the key to solving the problem of indoor formaldehyde pollution.

[0004] In conjunction with the above content, it should be noted that: Chinese patent application number CN2020106262944 discloses a method for detecting the formaldehyde release in formaldehyde-free artificial boards. After the test pieces are balanced, two test pieces that meet the temperature requirements are placed in a 1m 3 In the climate chamber, 2 hours after the test piece is placed in the climate chamber, an air sampling system is used to take samples. The formaldehyde release in the formaldehyde-free wood-based panel is calculated based on the formaldehyde content in the sampled air. The mass method is used to prepare various reagents to further improve accuracy.

[0005] In fact, the above detection method has limited information on formaldehyde release in indoor environments constructed by processing and assembling artificial boards or other materials used for interior decoration. It can only make an inaccurate analysis of the amount released by the materials in a short period of time, and cannot make a comprehensive judgment based on the continuous release of several groups of formaldehyde releasers over time. It is also unable to make a comprehensive judgment on the attenuation degree of indoor formaldehyde releasers, the residual indoor formaldehyde content and the dilution through air ventilation, resulting in blind treatment of indoor air, which leads to negative effects such as incomplete formaldehyde release in indoor air or excessive ventilation resulting in prolonged occupancy time.

[0006] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a device for detecting the amount of formaldehyde released from indoor air to solve the problem raised.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a device for detecting formaldehyde emissions in indoor air, comprising an intelligent control digital display touch platform for human-computer interactive control of the device, the intelligent control digital display touch platform being communicatively connected to a split-type gas acquisition module for real-time collection of raw data from multiple points indoors;

[0009] Gas parameter summary and initial screening module: Receive the raw data of the split gas acquisition module, pre-process and verify the validity of the data, identify and mark abnormal acquisition points, analyze the mean formaldehyde concentration and environmental parameter mean of each indoor monitoring point, and convert the processed data set D proc Send to the abnormal parameter risk analysis module and timeline parameter trend analysis module;

[0010] Abnormal parameter risk analysis module: receives the data set D processed by the gas parameter summary and screening module proc , analyze the formaldehyde concentration and environmental parameters of each monitoring point at the current moment, identify the concentration points that are significantly higher than the average level, comprehensively determine the current indoor formaldehyde risk status, and generate the current formaldehyde abnormality signal S a and environmental abnormal signal S e and sends the signal to the timeline parameter trend analysis module and the intelligent control decision module;

[0011] Timeline parameter trend analysis module: receives the historical data processed by the gas parameter summary and screening module and the current data set D proc , and formaldehyde abnormal signal S a and environmental abnormal signal S e Based on the time series analysis of formaldehyde concentration trends, release rates and attenuation laws, combined with environmental parameters, formaldehyde concentration trends and key release characteristics within a set time period in the future are predicted to generate a formaldehyde release prediction signal S p And send it to the intelligent control decision module;

[0012] Intelligent control decision module: receiving formaldehyde abnormal signal S a and environmental abnormal signal S e and formaldehyde release prediction signal S p ,According to the type, intensity and combination of signals, the comprehensive risk level of indoor formaldehyde pollution is evaluated and corresponding control instructions are generated.

[0013] Furthermore, the operation process of the split gas collection module is as follows:

[0014] By deploying several groups of independent gas collection units at different locations in the room, the original data of the points are collected according to the preset period. The original data includes the formaldehyde mixed concentration C f raw, temperature mixed value Traw, humidity mixed value Hraw and air velocity mixed value V a Raw data is preprocessed, and the sliding window average filter algorithm is applied to smooth the instantaneous fluctuations and filter out high-frequency noise to obtain the real-time mean formaldehyde concentration C f , temperature T, humidity H and air velocity V a , invalidate data points that are clearly beyond the physically possible range, including C f raw<0 or C f raw is greater than the safety threshold pre-stored by the intelligent control digital display touch platform, Traw, Hraw and V a Raw Similarly, the raw data and real-time mean are combined with the collection point identifier loc ID After being integrated with the precise timestamp t, it is sent to the gas parameter summary and initial screening module. Several groups of collection units have built-in formaldehyde sensors, temperature and humidity sensors, and anemometers.

[0015] Furthermore, the operation and analysis process of the gas parameter summary primary screening module is as follows:

[0016] The historical data is retrieved from the intelligent control digital display touch platform to convert the stored variance threshold. At the same time, the original data is effectively verified and processed. The variance of several consecutive data of each collection point is calculated and compared with the variance threshold. If the variance exceeds the variance threshold, the point is marked as an unstable point Flag. unstable ; Obtain the industry-specified space standard limit value and the formaldehyde concentration C at different collection points at the same time from the digital display touch platform f , temperature T, humidity H and air velocity V a For comparison, if the formaldehyde concentration C f , temperature T, humidity H and air velocity V a If there is a value that exceeds the industry-specified spatial standard limit, it will be marked as a spatial outlier Flag. spatial The spatial standard limit values ​​include the formaldehyde upper threshold, temperature upper threshold, humidity upper threshold and air flow upper threshold. The formaldehyde concentration of the unlabeled current batch of valid data is calculated to obtain the mean, maximum and minimum formaldehyde concentration, the maximum formaldehyde concentration, the minimum formaldehyde concentration, and the statistical values ​​of the temperature mean, humidity mean and air flow rate mean of the environmental parameters. The valid data, calculated statistical values ​​and labeling information are integrated into a structured dataset D. proc , and attached with the processing timestamp and sent to the abnormal parameter risk analysis module.

[0017] Furthermore, the environmental impact preliminary analysis process of the gas parameter summary primary screening module is as follows:

[0018] When generating the dataset D proc Finally, the potential impact of environmental parameters on formaldehyde concentration is further analyzed. The preset high temperature promotion release threshold, high humidity promotion release threshold and high ventilation dilution threshold are retrieved from the intelligent control digital display touch platform. The high temperature promotion release threshold is compared with the current temperature mean. If the temperature mean is greater than the high temperature promotion release threshold, a high temperature promotion mark is generated; the high humidity promotion release threshold is compared with the humidity mean. If the humidity mean is greater than the high humidity promotion release threshold, a high humidity promotion mark is generated; the high ventilation dilution threshold is compared with the air flow rate mean. If the air flow rate mean is greater than the ventilation dilution threshold, a high ventilation dilution mark is generated. The high temperature promotion mark, high humidity promotion mark and high ventilation dilution mark are added to the data set D proc It provides preliminary environmental status indications for risk analysis and trend prediction.

[0019] Furthermore, the operation and analysis steps of the abnormal parameter risk analysis module are as follows:

[0020] S1: Receive the current data set D transmitted by the gas parameter summary and initial screening module proc , check the data set D one by one proc Formaldehyde concentration C at each effective collection point f If the formaldehyde concentration C f Exceeds national standard limit C cafe , then the point is determined to be out of standard and the position of the point exceeding standard loc is recorded ID and formaldehyde concentration exceeding the standard value C f , and trigger the formaldehyde exceeding standard signal S a over, constitutes a determination of concentration exceeding the standard;

[0021] S2: Check the mean temperature, mean humidity and mean air velocity of the environmental parameters. If the mean temperature exceeds the normal operating temperature range of the equipment or the mean humidity exceeds the normal operating humidity range of the equipment, the abnormal operating condition sub-signal S is triggered. e The device combines the high temperature promotion mark, high humidity promotion mark and high ventilation dilution mark to judge the impact of the environment on the release, which constitutes the judgment of environmental abnormality;

[0022] S3: Analyze the formaldehyde concentration C of all valid collection points f The formaldehyde concentration mean and variance threshold are used to screen out the formaldehyde concentration C f >The collection point of formaldehyde concentration mean + K × variance threshold is marked as a significant high concentration point loc high , record its position and concentration value, and trigger the local high release source sub-signal S a local;

[0023] The abnormal parameter risk analysis module triggers the formaldehyde exceeding standard sub-signal S at the same time a over and high release source signal S a When local, formaldehyde abnormal signal S is generated a , if the equipment operating condition abnormal sub-signal S is triggered again at this moment e device, then an environmental abnormality signal S is generated e .

[0024] Furthermore, the risk level initial judgment process of the abnormal parameter risk analysis module is as follows:

[0025] The abnormal parameter risk analysis module retrieves the pre-stored risk judgment range index R from the intelligent control digital display touch platform cur Generates formaldehyde abnormal signal S a and environmental abnormal signal S e Compare the signal: When the formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e The device is not triggered, and R cur =1, low risk; when formaldehyde exceeds the standard signal S a Over trigger, significant high concentration point loc high Trigger, C f <2<C cafe , equipment operating condition abnormal sub-signal S e device is triggered or a high temperature promotion flag / high humidity promotion flag is present, and the R cur =2, medium risk; when formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e device are triggered, and C f ≥(2×C cafe ), determine R cur =3, high risk.

[0026] Furthermore, the operation and analysis steps of the timeline parameter trend analysis module are as follows:

[0027] S4: Based on the precise time stamp t as the X-axis, the formaldehyde concentration C f Construct a rectangular coordinate system for the Y axis, plot the mean formaldehyde concentration in the rectangular coordinate system by drawing points and connecting lines, directly observe the trend of multiple points and construct a trend analysis chart;

[0028] S5: Identify the rising concentration portion in the trend analysis chart and mark it ↑. Combined with whether the high ventilation dilution mark is generated, the indoor space volume is retrieved from the intelligent control digital display touch platform. When ↑ and the high ventilation dilution mark appear, it is determined that the formaldehyde release rate continues to increase.

[0029] S6: Identify the concentration decrease part in the trend analysis chart and mark it↓. Combined with the current statistical value and whether the high temperature promotion mark and high humidity promotion mark are generated, predict the formaldehyde concentration forecast value at the set time point in the future.

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention deploys split gas collection modules at multiple points indoors to collect multi-dimensional raw data such as formaldehyde concentration, temperature and humidity in real time. After sliding window filtering preprocessing and variance threshold and spatial standard verification, abnormal points are marked and a structured data set containing environmental impact markers is generated. This breaks through the limitations of single-point detection, improves data comprehensiveness and reliability, lays a high-quality foundation for subsequent analysis, and builds multi-point collaborative collection and refined data processing.

[0032] 2. The present invention uses the abnormal parameter risk analysis module to combine national standards, equipment operating conditions, etc. to identify exceeding points and high concentration points, and divide them into low, medium and high risk levels to achieve real-time early warning; the timeline module uses timestamps to construct trend analysis charts, combines environmental parameters and spatial volume, analyzes release rate, attenuation law and predicts future concentration trends, giving the system full-cycle risk analysis and prediction capabilities, and building multi-dimensional risk assessment and time series prediction.

[0033] 3. The present invention generates differentiated instructions by integrating risk signals and predicted values ​​through an intelligent control and decision-making module. When the risk is high, the sampling frequency is increased, high-volume ventilation and alarms are started, and the sampling and ventilation strategies are dynamically adjusted for medium and low risks. It is linked with indoor ventilation equipment to form a "detection-decision-execution" closed loop to avoid blind governance and optimize governance efficiency. It provides comprehensive information through a visual interface to assist in accurate decision-making and build an intelligent linkage control and closed-loop feedback mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a system flow chart of the present invention;

[0036] Figure 2 It is a trend analysis schematic diagram of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1 - Figure 2 As shown, this embodiment is a device for detecting formaldehyde emissions in indoor air, including an intelligent control digital display touch platform for human-computer interactive control of the indoor air formaldehyde detection device. The intelligent control digital display touch platform is communicatively connected to a split gas acquisition module for real-time collection of raw data from multiple points indoors. The operation process of the split gas acquisition module is as follows:

[0039] By deploying several groups of independent gas collection units at different locations in the room, such as the center of the room, corners, near furniture, and near vents, several groups of collection units have built-in formaldehyde sensors, temperature and humidity sensors, and anemometers. The raw data at the points are collected according to the preset cycle. The raw data includes the formaldehyde mixed concentration C directly read by the sensor. f raw, temperature mixed value Traw, humidity mixed value Hraw and air velocity mixed value V a Raw data is preprocessed, and the sliding window average filter algorithm is applied to smooth the instantaneous fluctuations and filter out high-frequency noise to obtain the real-time mean formaldehyde concentration C f , temperature T, humidity H and air velocity V a , invalidate data points that are clearly beyond the physically possible range, including C f raw<0 or C f raw is greater than the safety threshold pre-stored by the intelligent control digital display touch platform, Traw, Hraw and V a Raw Similarly, the raw data and real-time mean are combined with the collection point identifier loc ID After integration with the precise timestamp t, it is sent to the gas parameter summary and initial screening module, loc ID A number or code that uniquely identifies the location where the gas collection unit is installed, and the precise time at which data collection occurs.

[0040] Gas parameter summary and initial screening module: Receive the raw data of the split gas acquisition module, pre-process and verify the validity of the data, identify and mark abnormal acquisition points, analyze the mean formaldehyde concentration and environmental parameter mean of each indoor monitoring point, and convert the processed data set D procThe data is sent to the abnormal parameter risk analysis module and the timeline parameter trend analysis module. The operation and analysis process of the gas parameter summary and initial screening module is as follows:

[0041] The historical data is retrieved from the intelligent control digital display touch platform to convert the stored variance threshold. At the same time, the original data is effectively verified and processed. The variance of several consecutive data of each collection point is calculated and compared with the variance threshold. If the variance exceeds the variance threshold, the point is marked as an unstable point Flag. unstable ;

[0042] Obtain the industry-specified space standard limit value and formaldehyde concentration C at different collection points at the same time from the digital display touch platform f , temperature T, humidity H and air velocity V a For comparison, if the formaldehyde concentration C f , temperature T, humidity H and air velocity V a If there is a value that exceeds the industry-specified spatial standard limit, it will be marked as a spatial outlier Flag. spatial ,The space standard limit values ​​include formaldehyde upper threshold, temperature upper threshold, humidity upper threshold and air flow upper threshold, Flag unstable and Flag spatial is a Boolean flag;

[0043] Calculate the mean, maximum, and minimum values ​​of the unlabeled formaldehyde concentration of the current batch of valid data to obtain the mean formaldehyde concentration C avg , maximum formaldehyde concentration C max , minimum formaldehyde concentration C min , and the mean temperature T of the environmental parameters avg , average humidity H avg and the mean air velocity V a avg statistical value, integrating valid data, calculated statistical values ​​and label information into a structured data set D proc , and attached with the processing timestamp and sent to the abnormal parameter risk analysis module.

[0044] The preliminary analysis process of the environmental impact of the gas parameter summary screening module is as follows:

[0045] When generating the dataset D proc After that, the potential impact of environmental parameters on formaldehyde concentration was further analyzed, and the preset high temperature release threshold T was retrieved from the intelligent control digital display touch platform. high , high humidity promoted release threshold H high and high ventilation dilution threshold V a high, compare the high temperature release threshold with the current temperature average, if the temperature average is greater than the high temperature release threshold, a high temperature release flag is generated

[0046] The high humidity promoted release threshold H high and humidity mean H avg Compare and if the humidity mean value is greater than the high humidity promotion release threshold, a high humidity promotion mark is generated.

[0047] Set the high ventilation dilution threshold V a high and the mean air velocity V a avg, if the air velocity average is greater than the ventilation dilution threshold, a high ventilation dilution flag is generated.

[0048] High temperature promotes marking High humidity promotion mark and high ventilation dilution markers Add to dataset D proc It provides preliminary environmental status indication for risk analysis and trend forecast. It should be noted that: high It is expressed as the high temperature release threshold. If the temperature exceeds this value, it is considered that the temperature will significantly promote the release of formaldehyde; H high Expressed as the high humidity release threshold, above which humidity is considered to significantly promote formaldehyde release; V a High indicates a high ventilation dilution threshold. If the value exceeds this threshold, it is considered that ventilation has a significant dilution effect on formaldehyde.

[0049] Abnormal parameter risk analysis module: receives the data set D processed by the gas parameter summary and screening module proc , analyze the formaldehyde concentration and environmental parameters of each monitoring point at the current moment, identify the concentration points that are significantly higher than the average level, comprehensively determine the current indoor formaldehyde risk status, and generate the current formaldehyde abnormality signal S a and environmental abnormal signal S e The signal is sent to the timeline parameter trend analysis module and the intelligent control decision module. The operation and analysis steps of the abnormal parameter risk analysis module are as follows:

[0050] S1: Receive the current data set D transmitted by the gas parameter summary and initial screening module proc , check the data set D one by one proc Formaldehyde concentration C at each effective collection point f If the formaldehyde concentration C f Exceeds national standard limit C cafe , C cafe For example, 0.08 mg / m 3 (GB / T18883-20221 hourly average), then the point is determined to be out of standard and the location of the point exceeding the standard is recorded. ID and formaldehyde concentration exceeding the standard value C f If there is a point exceeding the standard, the formaldehyde exceeding standard sub-signal S is triggered aover, constitutes a determination of concentration exceeding the standard;

[0051] S2: Check the mean temperature T of the mean environmental parameter avg , average humidity H avg and the mean air velocity V a avg, if the average temperature T avg Exceeds the normal operating temperature range of the equipment or the average humidity H avg If the normal operating humidity range of the equipment is exceeded, the normal operating temperature range and normal operating humidity range of the equipment are retrieved from the intelligent control digital display touch platform, which represent the lower and upper limits of the temperature range for the normal operation of the detection device, and the abnormal operating condition sub-signal S of the equipment is triggered. e device, combined with high temperature to promote labeling High humidity promotion mark and high ventilation dilution markers Determine the impact of the environment on the release and determine if the environment is abnormal;

[0052] S3: Analyze the formaldehyde concentration C of all valid collection points f The mean formaldehyde concentration C avg , variance threshold, filter out formaldehyde concentration C f >The collection point of formaldehyde concentration mean + K × variance threshold is marked as a significant high concentration point loc high , record its position and concentration value, and trigger the local high release source sub-signal S a local, K represents the standard deviation multiplier coefficient used to identify significantly high concentration points, which is retrieved from the pre-stored storage in the intelligent control digital display touch platform;

[0053] The abnormal parameter risk analysis module triggers the formaldehyde exceeding standard sub-signal S at the same time a over and high release source signal S a When local, formaldehyde abnormal signal S is generated a , if the equipment operating condition abnormal sub-signal S is triggered again at this moment e device, then an environmental abnormality signal S is generated e .

[0054] Example 2: This example is a device for detecting formaldehyde emission in indoor air, including a timeline parameter trend analysis module: receiving the historical data processed by the gas parameter summary and screening module and the current data set D proc , and formaldehyde abnormal signal S a and environmental abnormal signal S e Based on the time series analysis of formaldehyde concentration trends, release rates and attenuation laws, combined with environmental parameters, formaldehyde concentration trends and key release characteristics within a set time period in the future are predicted to generate a formaldehyde release prediction signal S pAnd sent to the intelligent control decision module, the risk level initial judgment process of the abnormal parameter risk analysis module is as follows:

[0055] The abnormal parameter risk analysis module retrieves the pre-stored risk judgment range index R from the intelligent control digital display touch platform cur Generates formaldehyde abnormal signal S a and environmental abnormal signal S e Compare the signals:

[0056] When formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e The device is not triggered, and R cur =1, which is low risk. The intelligent control decision module gives a solution to maintain the basic sampling frequency, such as 10 minutes / time. cur The judgment levels are 1, 2 and 3;

[0057] When formaldehyde exceeds the standard signal S a Over trigger, significant high concentration point loc high Trigger, C f <2<C cafe , equipment operating condition abnormal sub-signal S e device is triggered or a high temperature promotion flag / high humidity promotion flag is present, and the R cur =2, indicating medium risk. The intelligent control and decision-making module proposes a plan to increase the sampling frequency to 5 minutes per time, and initiates intensive sampling of 1 minute per time at high concentration points.

[0058] When formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e device are triggered, and C f ≥(2×C cafe ), determine R cur =3, which is a high risk. The intelligent control decision-making module provides the highest frequency sampling plan, 30 seconds / time, and simultaneously monitors the temperature and humidity at the points exceeding the standard to identify the cause of release.

[0059] The operation and analysis steps of the timeline parameter trend analysis module are as follows:

[0060] S4: Based on the precise time stamp t as the X-axis, the formaldehyde concentration C f Construct a rectangular coordinate system for the Y axis and set the mean formaldehyde concentration C avg Draw in a rectangular coordinate system by drawing points and connecting lines, and directly observe the trend of multiple points and the slope of the change in the last hour. shortand the slope of change in the last 24 hours mid , construct a trend analysis chart;

[0061] S5: Identify the rising concentration in the trend analysis chart and mark it ↑, combined with the high ventilation dilution mark Is it generated? And the indoor space volume is retrieved from the intelligent control digital display touch platform. It is converted from the indoor area. When ↑ and high ventilation dilution mark appear When the formaldehyde release rate continues to increase, for example: the formaldehyde release rate R f ≈Slope shope ×Indoor space volume, in one hour observation period, Slope shope >0 and Indicates no severe ventilation situation;

[0062] S6: Identify the slope of the concentration drop in the trend analysis chart shope <0, and marked ↓, combined with the current statistical value and high temperature promotion mark and high humidity promotion mark Generate and predict the formaldehyde concentration value P at a set time point in the future f The set time point can be 1 hour, 6 hours or 12 hours, and the formaldehyde concentration prediction value P f =C avg (t 室内空间体积 )×exp(-G×(tt 室内空间体积 ), where G is the decay rate constant, which is obtained by fitting the recent downward trend data on the intelligent control digital display touch platform. It varies according to the actual data and is affected by the mean air velocity V. a avg influence, average air velocity V a The larger the avg value, the greater the indoor ventilation volume, and the better the diffusion treatment effect on the formaldehyde released and retained indoors. t represents the future time point that needs to be predicted, and exp represents the exponential decay law describing the formaldehyde concentration over time, which is obtained from the intelligent control digital display touch platform based on historical data.

[0063] Intelligent control decision module: receiving formaldehyde abnormal signal S a and environmental abnormal signal S e and formaldehyde release prediction signal S p , according to the type, intensity and combination of signals, evaluate the comprehensive risk level of indoor formaldehyde pollution and generate corresponding control instructions; combined with the current risk level R cur , formaldehyde concentration predicted value P f Whether it exceeds the standard, whether the predicted trend is continuously rising or falling, and the final comprehensive risk level R of the release characteristic assessment final , the final risk level determined by combining the current status and future predictions, for example, Rcur =2, but the predicted P f If the six-hour moving average falls below the safety line and the trend is good, the comprehensive risk level is R final When the concentration drops to 1, the intelligent control digital display touch platform communicates with the indoor intelligent ventilation system and the controller operates → air volume is controlled in stages, reducing the air volume to maintain the concentration. When the concentration decreases steadily, the ventilation is turned off in time, and natural ventilation from open windows is used to treat indoor formaldehyde.

[0064] On the contrary, R cur =2, but the predicted P f If the risk continues to rise or stabilize at a high level within six hours, the comprehensive risk level R final Maintain at 2 or increase to 3, the intelligent control digital display touch platform communicates with the indoor intelligent ventilation system and the controller operates → air volume graded control:

[0065] According to R final Maintain a slow upward trend at 2, low air volume, and at the same time, the yellow indicator light on the intelligent control digital display touch platform flashes slowly;

[0066] According to R final Rising to 3, a rapid upward trend, high air volume, and at the same time, the red indicator light on the intelligent control digital display touch platform flashes quickly, the buzzer alarm sounds, and an emergency notification is pushed to the mobile phone APP;

[0067] Sampling control: According to R final and predict trends, dynamically adjusting the sampling frequency of the split gas collection modules, such as increasing the frequency when the risk is high, or commanding independent gas collection units near specific high-concentration points to perform more intensive sampling;

[0068] Ventilation control: If R final ≥2, and the predicted formaldehyde concentration value P f Still exceeding the limit or with unfavorable trend, Then generate a ventilation start instruction or a ventilation increase instruction and send it to the indoor intelligent ventilation system linked with the indoor air formaldehyde detection device;

[0069] If R final =1, a ventilation reduction instruction or a ventilation shut-off instruction can be generated to save energy.

[0070] Combining the first and second embodiments, the limitations of single-point detection are overcome by split multi-point collection, which can truly reflect the spatial distribution of indoor formaldehyde. The gas parameter summary and initial screening module provides a reliable, structured, and preliminary environmental information-rich data set for subsequent modules through strict preprocessing, verification, and statistical analysis. proc The abnormal parameter risk analysis module accurately identifies the exceeding of the standard, abnormal points and current risks; the core value of the timeline parameter trend analysis module is to use historical data to predict the future and estimate the formaldehyde concentration prediction value P f, revealing the release pattern and enabling the system to have the ability to predict; the intelligent control decision module comprehensively analyzes the formaldehyde abnormal signal S a and environmental abnormal signal S e Conduct comprehensive risk level R final , and intelligently adjust the detection behavior itself (sampling frequency) and linked environmental equipment (ventilation) based on this, while providing users with intuitive, comprehensive (including prediction), and actionable interface information and suggestions; building a closed loop of "collection-processing-analysis-prediction-decision-making-feedback", which significantly improves the comprehensiveness, predictability and initiative of formaldehyde detection.

[0071] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

[0072] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Related accessories include couplings, screws, gears, gaskets and other commonly used mechanical connection components in this field, but are not limited to these. They are replaced and adapted according to actual use.

[0073] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for detecting formaldehyde emission in indoor air, characterized in that: It includes an intelligent control digital display touch platform for human-computer interactive control of the indoor air formaldehyde detection device, and the intelligent control digital display touch platform is communicatively connected to a split gas collection module for real-time collection of raw data from multiple points indoors; Gas parameter summary and initial screening module: Receive the raw data from the split gas acquisition module, pre-process and verify the validity of the data, identify and mark abnormal acquisition points, analyze the mean formaldehyde concentration and environmental parameter mean of each indoor monitoring point, and convert the processed data set D proc Send to the abnormal parameter risk analysis module and timeline parameter trend analysis module; Abnormal parameter risk analysis module: receives the data set D processed by the gas parameter summary and screening module proc , analyze the formaldehyde concentration and environmental parameters of each monitoring point at the current moment, identify the concentration points that are significantly higher than the average level, comprehensively determine the current indoor formaldehyde risk status, and generate the current formaldehyde abnormality signal S a and environmental abnormal signal S e and sends the signal to the timeline parameter trend analysis module and the intelligent control decision module; Timeline parameter trend analysis module: receives the historical data processed by the gas parameter summary and screening module and the current data set D proc , and formaldehyde abnormal signal S a and environmental abnormal signal S e Based on the precise timestamp t, the change trend, release rate and attenuation law of formaldehyde concentration are analyzed, and the formaldehyde concentration trend and key release characteristics within the future set time period are predicted in combination with environmental parameters to generate the formaldehyde concentration prediction value P f And send it to the intelligent control decision module; Intelligent control decision module: receiving formaldehyde abnormal signal S a and environmental abnormal signal S e And the predicted value of formaldehyde concentration P f , evaluate the comprehensive risk level of indoor formaldehyde pollution and generate corresponding control instructions.

2. The indoor air formaldehyde emission detection device according to claim 1, characterized in that: The operation process of the split gas collection module is as follows: By deploying several groups of independent gas collection units at different locations in the room, the original data of the points are collected according to the preset period. The original data includes the formaldehyde mixed concentration C f raw, temperature mixed value Traw, humidity mixed value Hraw and air velocity mixed value V a Raw data is preprocessed, and the sliding window average filter algorithm is applied to smooth the instantaneous fluctuations and filter out high-frequency noise to obtain the real-time mean formaldehyde concentration C f , temperature T, humidity H and air velocity V a , the original data and real-time mean together with the collection point mark loc ID After being integrated with the precise timestamp t, it is sent to the gas parameter summary and initial screening module.

3. The indoor air formaldehyde emission detection device according to claim 2, characterized in that: The operation and analysis process of the gas parameter summary primary screening module is as follows: The historical data is retrieved from the intelligent control digital display touch platform to convert the stored variance threshold. At the same time, the original data is effectively verified and processed. The variance of several consecutive data of each collection point is calculated and compared with the variance threshold. If the variance exceeds the variance threshold, the point is marked as an unstable point Flag. unstable ; Obtain the industry-specified space standard limit value and the formaldehyde concentration C at different collection points at the same time from the digital display touch platform f , temperature T, humidity H and air velocity V a For comparison, if the formaldehyde concentration C f , temperature T, humidity H and air velocity V a If there is a value that exceeds the industry-specified spatial standard limit, it will be marked as a spatial outlier Flag. spatial Calculate the mean, maximum, and minimum formaldehyde concentrations of the unlabeled current batch of valid data, and obtain the statistical values ​​of the mean, maximum, and minimum formaldehyde concentrations, as well as the mean temperature, mean humidity, and mean air velocity of the environmental parameters. Integrate the valid data, calculated statistical values, and labeling information into a structured dataset D proc , and attached with the processing timestamp and sent to the abnormal parameter risk analysis module.

4. The indoor air formaldehyde emission detection device according to claim 3, characterized in that: The preliminary analysis process of the environmental impact of the gas parameter summary screening module is as follows: When generating the dataset D proc Finally, the potential impact of environmental parameters on formaldehyde concentration is further analyzed. The preset high temperature promotion release threshold, high humidity promotion release threshold and high ventilation dilution threshold are retrieved from the intelligent control digital display touch platform. The high temperature promotion release threshold is compared with the current temperature mean. If the temperature mean is greater than the high temperature promotion release threshold, a high temperature promotion mark is generated; the high humidity promotion release threshold is compared with the humidity mean. If the humidity mean is greater than the high humidity promotion release threshold, a high humidity promotion mark is generated; the high ventilation dilution threshold is compared with the air flow rate mean. If the air flow rate mean is greater than the ventilation dilution threshold, a high ventilation dilution mark is generated. The high temperature promotion mark, high humidity promotion mark and high ventilation dilution mark are added to the data set D proc It provides preliminary environmental status indications for risk analysis and trend prediction.

5. The indoor air formaldehyde emission detection device according to claim 1, characterized in that: The operation and analysis steps of the abnormal parameter risk analysis module are as follows: S1: Receive the current data set D transmitted by the gas parameter summary and initial screening module proc , check the data set D one by one proc Formaldehyde concentration C at each effective collection point f If the formaldehyde concentration C f Exceeds national standard limit C cafe , then the point is determined to be out of standard and the position of the point exceeding standard loc is recorded ID and formaldehyde concentration exceeding the standard value C f , and trigger the formaldehyde exceeding standard signal S a over, constitutes a determination of excessive concentration; S2: Check the mean temperature, mean humidity and mean air velocity of the environmental parameters. If the mean temperature exceeds the normal operating temperature range of the equipment or the mean humidity exceeds the normal operating humidity range of the equipment, the abnormal operating condition sub-signal S is triggered. e The device combines the high temperature promotion mark, high humidity promotion mark and high ventilation dilution mark to judge the impact of the environment on the release, which constitutes the judgment of environmental abnormality; S3: Analyze the formaldehyde concentration C of all valid collection points f The formaldehyde concentration mean and variance threshold are used to screen out the formaldehyde concentration C f >The collection point of formaldehyde concentration mean + K × variance threshold is marked as a significant high concentration point loc high , record its position and concentration value, and trigger the local high release source sub-signal S a local; The abnormal parameter risk analysis module triggers the formaldehyde exceeding standard sub-signal S at the same time a over and high release source signal S a When local, formaldehyde abnormal signal S is generated a , if the equipment operating condition abnormal sub-signal S is triggered again at this moment e device, then an environmental abnormality signal S is generated e .

6. The indoor air formaldehyde emission detection device according to claim 5, characterized in that: The risk level initial judgment process of the abnormal parameter risk analysis module is as follows: The abnormal parameter risk analysis module retrieves the pre-stored risk judgment range index R from the intelligent control digital display touch platform cur Generates formaldehyde abnormal signal S a and environmental abnormal signal S e Compare the signal: When the formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e The device is not triggered, and R cur =1, low risk; when formaldehyde exceeds the standard signal S a Over trigger, significant high concentration point loc high Trigger, C f <2<C cafe , equipment operating condition abnormal sub-signal S e device is triggered or a high temperature promotion flag / high humidity promotion flag is present, and the R cur =2, medium risk; when formaldehyde exceeds the standard signal S a over, significantly high concentration point loc high and equipment operating condition abnormal sub-signal S e device are triggered, and C f ≥(2×C cafe ), determine R cur =3, high risk.

7. The indoor air formaldehyde emission detection device according to claim 6, characterized in that: The operation and analysis steps of the timeline parameter trend analysis module are as follows: S4: Based on the precise time stamp t as the X-axis, the formaldehyde concentration C f Construct a rectangular coordinate system for the Y axis, plot the mean formaldehyde concentration in the rectangular coordinate system by drawing points and connecting lines, directly observe the trend of multiple points and construct a trend analysis chart; S5: Identify the rising concentration portion in the trend analysis chart and mark it ↑. Combined with whether the high ventilation dilution mark is generated, the indoor space volume is retrieved from the intelligent control digital display touch platform. When ↑ and the high ventilation dilution mark appear, it is determined that the formaldehyde release rate continues to increase. S6: Identify the concentration decrease part in the trend analysis chart and mark it↓. Combined with the current statistical value and whether the high temperature promotion mark and high humidity promotion mark are generated, predict the formaldehyde concentration forecast value at the set time point in the future.

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