Biosafety facility ventilation control system and method

Abstract

The invention discloses a ventilation control system and method for a biological safety facility, and relates to the technical field of ventilation control. Pressure sensors are deployed indoors and outdoors, and indoor and outdoor air pressure is monitored to judge whether the current indoor negative pressure environment is qualified or not; if the current indoor negative pressure environment is qualified, indoor air quality is obtained, and an air quality abnormal value is calculated; calculating an abnormal rising value of the indoor temperature; obtaining the number of indoor personnel and calculating a personnel fluctuation value; according to the air quality abnormal value, the temperature rising abnormal value and the personnel fluctuation value, whether the ventilation air volume of the current biological safety facility needs to be controlled and adjusted or not is determined; therefore, whether the negative pressure environment goes wrong or not can be detected in time, ventilation of biological safety facilities is controlled in time according to actual conditions, the indoor negative pressure environment is adjusted, it is ensured that pollutants cannot be accumulated or diffused in a laboratory, the risk that workers are exposed is reduced, and the pollutants cannot be leaked into the environment; and the safety of external personnel and the surrounding environment cannot be endangered.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation control, and particularly to a ventilation control system and method for biosafety facilities. Background Art

[0002] The ventilation control system of biosafety facilities is mainly used to prevent the spread of pathogens, aerosols or other harmful pollutants in the indoor environment of biosafety laboratories, and to ensure the safety of laboratory personnel, medical staff and the external environment. Usually, such facilities adopt negative pressure control. By precisely adjusting the air volume of intake and exhaust air, it is ensured that the indoor pressure is always lower than the external environment to prevent the leakage of pollutants. At the same time, the ventilation system also combines measures such as high-efficiency particulate air (HEPA) filters and ultraviolet disinfection to purify the exhausted air and reduce the impact on the external environment. Currently, most ventilation control methods rely on fixed air volume or differential pressure-based adjustment strategies to maintain a predefined negative pressure environment.

[0003] However, if there are problems with the negative pressure environment and the ventilation of biosafety facilities cannot be controlled in a timely manner according to the actual situation to adjust the indoor negative pressure environment, pollutants may accumulate or spread in the laboratory, increasing the risk of exposure of staff, and even may leak into the environment, endangering the safety of external personnel and the surrounding environment. Summary of the Invention

[0004] The object of the present invention is to solve the above-mentioned problems, and to provide a ventilation control system and method for biosafety facilities.

[0005] In the first aspect of the implementation of the present invention, a ventilation control method for biosafety facilities is first proposed. The method is applied to a server, and the server is used to control the ventilation of the indoor environment of biosafety facilities. The method includes:

[0006] Deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors, and analyze and judge whether the current indoor negative pressure environment is qualified according to the air pressure indoors and outdoors;

[0007] If the indoor negative pressure environment is unqualified, increase the exhaust air volume and decrease the intake air volume of the ventilation of the biosafety facilities;

[0008] If the current indoor negative pressure environment is qualified, obtain the air quality of the indoor environment through various types of air quality sensors deployed indoors, calculate the air quality anomaly value, and analyze whether the indoor air quality is abnormal;

[0009] If the current indoor negative pressure environment is qualified, obtain the abnormal increase value of the indoor temperature through the temperature sensor deployed indoors, and analyze whether the indoor temperature is too high;

[0010] If the negative pressure environment in the current room is qualified, obtain the number of people in the room, calculate the personnel fluctuation value, and analyze whether the number of people in the room is excessive;

[0011] Determine whether it is necessary to control and adjust the air volume of the ventilation of the current biosafety facility according to the air quality anomaly value, the abnormal increase value of the temperature, and the personnel fluctuation value, and adjust the negative pressure environment in the room.

[0012] Optionally, pressure sensors are deployed indoors and outdoors to monitor the air pressure indoors and outdoors. The steps to analyze and judge whether the negative pressure environment in the current room is qualified according to the air pressure indoors and outdoors are as follows:

[0013] Obtain the air pressure indoors and outdoors at multiple consecutive moments, and calculate the air pressure difference indoors and outdoors at each moment to obtain a sequence of air pressure differences in chronological order;

[0014] If any one of the air pressure differences in the sequence of air pressure differences is greater than -5 Pa, it means that the negative pressure environment in the current room is unqualified. At this time, increase the exhaust air volume of the biosafety facility ventilation and decrease the intake air volume;

[0015] If each of the air pressure differences in the sequence of air pressure differences is not greater than -5 Pa, it means that the negative pressure environment in the current room is qualified. At this time, the ventilation of the biosafety facility remains unchanged and no adjustment is made temporarily.

[0016] Optionally, the steps to obtain the air quality anomaly value by calculating the air quality in the room through various types of air quality sensors deployed in the room are as follows:

[0017] The air quality sensors include a carbon dioxide sensor, a formaldehyde sensor, a particulate matter sensor, and a volatile organic compound (VOC) sensor; the air parameters in the room collected by the air quality sensors are CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration respectively;

[0018] Obtain the CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration in the room at multiple consecutive moments, and calculate the maximum CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration respectively with the corresponding highest concentration thresholds. Calculate the difference between the concentration of each air parameter and the corresponding highest concentration threshold as the anomaly value of the corresponding air parameter, and divide the anomaly value of each air parameter by the corresponding highest concentration threshold to obtain the anomaly ratio of the corresponding air parameter;

[0019] Add up the anomaly ratios of all air parameters to obtain the air quality anomaly value.

[0020] Optionally, the steps to obtain the abnormal increase value of the temperature in the room by using the temperature sensors deployed in the room are as follows:

[0021] Obtain the indoor temperature at multiple consecutive moments to get a temperature signal, and perform a fast Fourier transform on the temperature signal to convert the temperature signal from the time domain to the frequency domain, obtaining a spectrogram;

[0022] Calculate the amplitude of each frequency component in the spectrogram, set an amplitude threshold, calculate the average amplitude greater than the amplitude threshold, and calculate the difference between the calculated average and the amplitude threshold, and divide the difference by the amplitude threshold to obtain the abnormal value of temperature increase.

[0023] Optionally, the steps to obtain the number of people in the room and calculate the personnel fluctuation value are as follows:

[0024] Obtain the number of people in the room, obtain the volume of the movable space in the room, divide the number of people by the volume of the movable space to get the average activity density value, and divide the average activity density value by the preset standard average activity density value to obtain the activity density index;

[0025] Continuously obtain the activity density index over a period of time, plot it as a time-activity density index curve, divide the curve into several sub-segments, and perform clustering according to the slope of each sub-segment to obtain several clustering clusters;

[0026] Calculate the average slope of each clustering cluster, calculate the standard deviation of the average slopes of all clustering clusters, and divide the standard deviation by the preset standard deviation to obtain the personnel fluctuation value.

[0027] Optionally, the steps to determine whether to control and adjust the air volume of the ventilation of the current biosafety facility according to the air quality abnormal value, the abnormal value of temperature increase, and the personnel fluctuation value to adjust the negative pressure environment in the room are as follows:

[0028] Add the air quality abnormal value, the abnormal value of temperature increase, and the personnel fluctuation value to obtain a ventilation adjustment value, and compare the ventilation adjustment value with the preset ventilation adjustment value threshold. If the ventilation adjustment value is less than the preset ventilation adjustment value threshold, there is no need to adjust the air volume of the ventilation of the current biosafety facility;

[0029] If the ventilation adjustment value is not less than the preset ventilation adjustment value threshold, it is necessary to adjust the air volume of the ventilation of the current biosafety facility; and control the exhaust air volume of the biosafety facility ventilation to increase and the intake air volume to decrease.

[0030] In the second aspect of the implementation of the present invention, a biosafety facility ventilation control system is proposed. The system is applied to a server, and the server is used to control the ventilation of the biosafety facility for the indoor environment. The system includes:

[0031] Judgment module: Deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors, and analyze and judge whether the current indoor negative pressure environment is qualified according to the air pressure indoors and outdoors;

[0032] Environment unqualified module: If the negative pressure environment in the front chamber is unqualified, increase the exhaust air volume and decrease the intake air volume of the biosafety facility ventilation control.

[0033] Air quality anomaly module: If the negative pressure environment in the current chamber is qualified, obtain the air quality in the chamber through various types of air quality sensors deployed in the chamber, calculate the air quality anomaly value, and analyze whether the air quality in the chamber is abnormal.

[0034] Temperature increase module: If the negative pressure environment in the current chamber is qualified, obtain the abnormal temperature increase value in the chamber through the temperature sensors deployed in the chamber, and analyze whether the temperature in the chamber is too high.

[0035] Personnel fluctuation module: If the negative pressure environment in the current chamber is qualified, obtain the number of people in the chamber, calculate the personnel fluctuation value, and analyze whether the number of people in the chamber is too large.

[0036] Control and regulation module: Determine whether it is necessary to control and regulate the air volume of the current biosafety facility ventilation according to the air quality anomaly value, the abnormal temperature increase value, and the personnel fluctuation value, and regulate the negative pressure environment in the chamber.

[0037] Advantages of the present invention:

[0038] The present invention provides a biosafety facility ventilation control system and method. By deploying pressure sensors inside and outside the chamber, monitoring the air pressure inside and outside the chamber, and analyzing and judging whether the negative pressure environment in the current chamber is qualified according to the air pressure inside and outside the chamber; if the negative pressure environment in the current chamber is qualified, obtain the air quality in the chamber through various types of air quality sensors deployed in the chamber, calculate the air quality anomaly value; obtain the abnormal temperature increase value in the chamber through the temperature sensors deployed in the chamber; obtain the number of people in the chamber and calculate the personnel fluctuation value; determine whether it is necessary to control and regulate the air volume of the current biosafety facility ventilation according to the air quality anomaly value, the abnormal temperature increase value, and the personnel fluctuation value, and regulate the negative pressure environment in the chamber. In this way, it can timely detect whether there is a problem with the negative pressure environment, and timely control the ventilation of the biosafety facility according to the actual situation, adjust the negative pressure environment in the chamber, ensure that pollutants will not accumulate or spread in the laboratory, reduce the risk of exposure of the staff, will not leak to the environment, and will not endanger the safety of external personnel and the surrounding environment. Brief description of the drawings

[0039] The following further describes the present invention with reference to the drawings.

[0040] Figure 1 It is a flowchart of a biosafety facility ventilation control method;

[0041] Figure 2 It is a framework diagram of a biosafety facility ventilation control system. Detailed implementation manners

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

[0043] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] The embodiments of the present invention provide a method for controlling the ventilation of a biosafety facility. Refer to Figure 1 , Figure 1 which is a flowchart of a method for controlling the ventilation of a biosafety facility provided by the embodiments of the present invention. This method is applied to a server, and the server is used to control the indoor ventilation of the biosafety facility. The method includes:

[0045] Deploy pressure sensors indoors and outdoors to monitor the air pressures indoors and outdoors, and analyze and judge whether the current negative pressure environment indoors is qualified according to the air pressures indoors and outdoors;

[0046] If the negative pressure environment in the front room is unqualified, then control the exhaust air volume of the biosafety facility ventilation to increase and the intake air volume to decrease;

[0047] If the current negative pressure environment indoors is qualified, then obtain the air quality indoors through various types of air quality sensors deployed indoors, calculate the air quality anomaly value, and analyze whether the air quality indoors is abnormal;

[0048] If the current negative pressure environment indoors is qualified, then obtain the abnormal increase value of the indoor temperature through the temperature sensor deployed indoors, and analyze whether the indoor temperature is too high;

[0049] If the current negative pressure environment indoors is qualified, then obtain the number of people indoors, calculate the personnel fluctuation value, and analyze whether the number of people indoors is too large;

[0050] Determine whether it is necessary to control and adjust the air volume of the current biosafety facility ventilation according to the air quality anomaly value, the abnormal increase value of the temperature, and the personnel fluctuation value, and adjust the negative pressure environment indoors.

[0051] Based on a biosafety facility ventilation control method provided by an embodiment of the present invention, through the above method, it is possible to timely detect whether there is a problem with the negative pressure environment, and timely control the ventilation of the biosafety facility according to the actual situation, adjust the indoor negative pressure environment, ensure that pollutants will not accumulate or spread in the laboratory, reduce the risk of exposure of staff, will not leak to the environment, and will not endanger the safety of external personnel and the surrounding environment.

[0052] In one embodiment, the steps of deploying pressure sensors indoors and outdoors, monitoring the air pressures indoors and outdoors, and analyzing and judging whether the current indoor negative pressure environment is qualified according to the air pressures indoors and outdoors are as follows:

[0053] Obtain the air pressures indoors and outdoors at multiple consecutive moments, and calculate the air pressure difference between indoors and outdoors at each moment to obtain an air pressure difference sequence based on the time sequence;

[0054] If any air pressure difference in the air pressure difference sequence is greater than -5 Pa, it means that the current indoor negative pressure environment is unqualified. At this time, increase the exhaust air volume and decrease the intake air volume of the biosafety facility ventilation;

[0055] If each air pressure difference in the air pressure difference sequence is not greater than -5 Pa, it means that the current indoor negative pressure environment is qualified. At this time, the biosafety facility ventilation remains unchanged and no adjustment is made temporarily.

[0056] It should be noted that in a biosafety facility, the negative pressure environment is maintained by the air pressure difference between indoors and outdoors. Generally, it is required that the indoor air pressure is lower than the outdoor air pressure. A qualified negative pressure environment should ensure that the indoor air pressure difference is always not greater than -5 Pa, which means that the indoor air pressure is always lower than the outdoor air pressure and the difference is maintained within a reasonable range. If the air pressure difference is greater than -5 Pa, the indoor negative pressure environment may have got out of control, there is a risk of pollutant leakage or diffusion to the external environment, which may cause potential harm to experimental personnel and the external environment. Therefore, the qualified standard for the negative pressure environment generally requires that the air pressure difference between indoors and outdoors cannot exceed -5 Pa, which is an important threshold. Setting -5 Pa as the lowest qualified standard is actually to ensure that the air inside the laboratory is always in a relatively negative pressure state, that is, the air flow always flows from the inside of the laboratory to the outside, rather than the opposite. The core function of the negative pressure environment is to ensure the safety of external personnel by preventing the diffusion of indoor pollutants and to control harmful substances from leaking to the outside. If the air pressure difference is too large or close to 0 Pa, the air pressures indoors and outdoors are close to balance, which may lead to the diffusion of pollutants and pose a risk of external pollution in the laboratory. At this time, pollutants may leak through door and window gaps, ventilation ducts or other exhaust outlets, endangering the surrounding environment. Therefore, maintaining an air pressure difference of at least -5 Pa can effectively prevent such leakage phenomena from occurring.

[0057] For example, assume that a biosafety laboratory requires maintaining the air pressure difference between the inside and outside not to exceed -5 Pa. During an experiment, the system monitors that the air pressure difference between the inside and outside is -6 Pa, which indicates that the negative pressure environment inside is still qualified and the risk of pollutant diffusion is relatively low. At this time, the ventilation system in the laboratory remains unchanged and continues to operate without the need to adjust the air volume. On the contrary, if the air pressure difference rises to -3 Pa or closer to 0 Pa, it means that the negative pressure environment inside becomes unstable, and pollutants may diffuse into the external environment with the air flow, posing a potential danger. Therefore, in this case, the system will automatically adjust the exhaust air volume and increase the exhaust intensity to ensure that the air pressure difference returns to the qualified range and prevent any pollutant leakage.

[0058] In one implementation method, by setting the threshold of the air pressure difference value to -5 Pa and adjusting the operation of the ventilation system according to this standard, the safety of the laboratory can be maximally maintained while avoiding unnecessary energy waste. This method ensures the reliability of the negative pressure environment through precise air pressure control, thereby guaranteeing the safety of personnel and the hygiene and safety of the external environment.

[0059] It should be noted that if any air pressure difference value in the air pressure difference value sequence is not greater than -5 Pa, it indicates that the negative pressure environment inside is unqualified. At this time, the exhaust air volume of the biosafety facility ventilation is controlled to increase and the intake air volume is reduced; when any air pressure difference value in the air pressure difference value sequence is not greater than -5 Pa, it indicates that the air pressure difference between the inside and outside has become abnormal, which may lead to the failure of the negative pressure environment and further increase the risk of pollutant leakage. The core purpose of the negative pressure environment is to ensure that the indoor air pressure is lower than the external environment, prevent the leakage of harmful substances such as pathogens and aerosols, and protect the safety of experimental personnel and the external environment. When the air pressure difference value is close to or less than -5 Pa, it means that the indoor air pressure is close to the external air pressure, or the indoor air pressure may even be higher than the external air pressure. This situation will cause the harmful substances in the laboratory to be carried out by the air flow and diffuse into the surrounding environment, increasing the risk of pollution. Therefore, in this case, it is necessary to quickly restore the negative pressure state by increasing the exhaust air volume and reducing the intake air volume. Increasing the exhaust air volume helps to continuously exhaust the air inside the room and reduce the indoor air pressure; while reducing the intake air volume prevents the inflow of external air and ensures that the indoor air pressure remains lower than the outside. This adjustment measure can effectively contain the diffusion of pollutants, ensure the qualification of the negative pressure environment of the biosafety facility, and maximize the safety of the laboratory.

[0060] In one embodiment, the steps of obtaining the indoor air quality and calculating the air quality anomaly value through various types of air quality sensors deployed indoors are as follows:

[0061] The air quality sensor includes a carbon dioxide sensor, a formaldehyde sensor, a particulate matter sensor, and a volatile organic compound (VOC) sensor; the air parameters collected by the air quality sensor in the room are the CO2 concentration, the PM2.5 concentration, the TVOCs concentration, and the formaldehyde concentration respectively;

[0062] Obtain the CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration in the room at multiple consecutive moments, and calculate the maximum CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration respectively with the corresponding highest concentration thresholds, calculate the difference between the concentration of each air parameter and the corresponding highest concentration threshold as the anomaly value of the corresponding air parameter, and divide the anomaly value of each air parameter by the corresponding highest concentration threshold to obtain the anomaly ratio of the corresponding air parameter;

[0063] Add up the anomaly ratios of all air parameters to obtain the air quality anomaly value.

[0064] It should be noted that the air quality anomaly value refers to a comprehensive value obtained by detecting multiple pollutants (such as CO 2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration) in indoor air, calculating the anomaly ratio of each pollutant, and finally. This value reflects the deviation degree of the pollutant concentration in the air from the preset highest threshold. The larger the air quality anomaly value, the closer or exceeding the safety standard the pollutant concentration in the air is, and the worse the indoor air quality is. Even if the negative pressure environment in the room is qualified currently, if the air quality anomaly value is large, the ventilation system of the biosafety facility still needs to be adjusted. Increasing the exhaust air volume and reducing the intake air volume helps to quickly discharge the harmful substances in the room, prevent pollutants from accumulating in the room, and ensure the safety of the staff. If not adjusted, the indoor pollutant concentration may continue to rise, bringing potential health risks and even the risk of laboratory leakage. Therefore, controlling the ventilation system to ensure the qualified indoor air quality can effectively avoid the diffusion of pollutants and ensure the safety of the experimental environment and the health of the experimental personnel.

[0065] In one implementation method, different highest concentration thresholds are set by professionals according to the actual situation, and specific details are not limited and will not be elaborated.

[0066] In one embodiment, the steps to obtain the temperature anomaly value of the indoor temperature through the temperature sensor deployed in the room are as follows:

[0067] Obtain the indoor temperature at multiple consecutive moments to obtain a temperature signal, and perform a fast Fourier transform on the temperature signal to convert the temperature signal from the time domain to the frequency domain to obtain a spectrogram;

[0068] Calculate the amplitude of each frequency component in the spectrogram, set an amplitude threshold, calculate the average amplitude greater than the amplitude threshold, and calculate the difference between the calculated average and the amplitude threshold, and divide the difference by the amplitude threshold as the abnormal value of temperature increase.

[0069] In one implementation, the amplitude threshold is set by professionals according to the actual situation, and no specific limitation and elaboration are made.

[0070] It should be noted that the abnormal value of temperature increase refers to the numerical value of the abnormal degree of temperature calculated by analyzing the frequency-domain change of the indoor temperature signal. If the temperature shows abnormal fluctuations or increases within a certain period of time, and this kind of fluctuation exceeds the normal periodic change range, a relatively high abnormal value of temperature increase will be generated. Through the Fast Fourier Transform (FFT), the periodicity and sudden abnormal fluctuations of temperature changes can be effectively revealed. For example, when there is equipment or chemical reaction in the laboratory releasing a large amount of heat, it may cause a sharp rise in temperature, and this change is manifested as high-amplitude frequency components in the frequency domain, thus calculating a relatively large abnormal value of temperature increase. Even if the current negative pressure environment in the room is qualified, the abnormal value of temperature increase still needs attention. The abnormal increase in temperature may not only affect the chemical reactions and equipment performance in the experiment, but may even change the volatility of gases, resulting in an increase in the concentration of harmful substances or gases in the air, and even triggering dangerous reactions of experimental materials. In addition, too high temperature may affect the diffusion speed and mode of air pollutants, thus increasing the health risks of staff. Therefore, the larger the abnormal value of temperature increase, it means that the temperature in the laboratory is no longer within the safe normal fluctuation range, which may pose potential threats to the environment and personnel. At this time, even if there is no problem with the negative pressure environment, it is still necessary to control the ventilation system of the biosafety facility, increase the exhaust air volume in time, and reduce the intake air volume. This can effectively accelerate the discharge of hot air, avoid the continuous rise of temperature, and reduce the negative impact brought by the temperature increase. Through such adjustment, the stability of the indoor environment can be maintained, preventing the accumulation of pollutants or gas leakage in the room, and at the same time ensuring the safety of experimental personnel. The control of temperature can not only reduce the potential risks in the laboratory, but also ensure the smooth progress of the experiment and avoid affecting the experimental results due to abnormal temperature.

[0071] In one embodiment, the steps of obtaining the number of people in the room and calculating the personnel fluctuation value are as follows:

[0072] Obtain the number of people in the room, obtain the volume of the movable space in the room, divide the number of people by the volume of the movable space to get the average activity density value, and divide the average activity density value by the preset standard average activity density value to get the activity density index;

[0073] Continuously obtain the activity density index within a period of time, plot it as a time-activity density index curve, divide the curve into several sub-segments, and perform clustering according to the slope of each sub-segment to obtain several clustering clusters;

[0074] Calculate the mean slope of each clustering cluster, calculate the standard deviation of the mean slopes of all clustering clusters, and divide the standard deviation by a preset standard deviation to obtain the personnel fluctuation value.

[0075] In one implementation manner, during the calculation of the personnel fluctuation value, the data mainly involved includes the number of people in the room and the volume of the movable space. The number of people can be obtained by installing devices such as people counting sensors, infrared sensors, or video monitoring systems in the room to monitor the number of people entering and leaving the room in real time. The volume of the movable space is usually obtained through building floor plans or by means such as lidar to determine the actual size of the space available for activities in the room. Based on these data and combined with the real-time sensor monitoring results, the activity density value of the personnel can be calculated, and the fluctuation of the personnel density can be further analyzed. These sensor data can be integrated with the ventilation control system and the air quality monitoring system to be fed back in real time and used to calculate the personnel fluctuation value, thereby providing a basis for the adjustment of the ventilation system.

[0076] It should be noted that the personnel fluctuation value refers to the degree of fluctuation of the indoor personnel density change within a certain time range. Specifically, it is obtained by calculating the slope of the indoor activity density index curve and comparing the standard deviation of the slope with a preset standard deviation, so as to obtain a value reflecting the fluctuation range of the personnel density. If the personnel fluctuation value is large, it means that the density of personnel activities has changed greatly in a short period of time, which may mean that a large number of people enter and leave or concentrate in a specific area in a short period of time, resulting in deterioration of local air quality or accumulation of pollutants in a specific area, increasing the biosafety risk.

[0077] When the personnel fluctuation value is large, even if the current negative pressure environment in the room is qualified, it is necessary to control the ventilation system of the biosafety facilities to make corresponding adjustments. Specifically, the exhaust air volume should be increased and the intake air volume should be reduced to accelerate the replacement and dilution effect of the indoor air. The advantage of doing this is that by strengthening the exhaust air, it can effectively discharge the pollutants or harmful gases (such as carbon dioxide, volatile organic compounds, etc.) that may accumulate in the room in time, preventing these harmful substances from staying in the room for a long time. In addition, reducing the intake air volume can effectively prevent external air and pollutants from entering the experimental environment, maintain the negative pressure stability, and further enhance the safety of the laboratory. In short, adjusting the exhaust air volume and intake air volume in a timely manner can not only ensure the indoor air quality, but also reduce the risk of personnel exposure, avoid the spread of pollutants, and ensure that the biosafety facilities are in the best operating state.

[0078] In one embodiment, it is determined whether it is necessary to control and adjust the air volume of the current biosafety facility ventilation according to the air quality outlier, the temperature increase outlier, and the personnel fluctuation value. The steps for adjusting the negative pressure environment in the room are as follows:

[0079] Add the air quality outlier, the temperature increase outlier, and the personnel fluctuation value to obtain a ventilation adjustment value, and compare the ventilation adjustment value with a preset ventilation adjustment value threshold. If the ventilation adjustment value is less than the preset ventilation adjustment value threshold, it is not necessary to adjust the air volume of the current biosafety facility ventilation;

[0080] If the ventilation adjustment value is not less than the preset ventilation adjustment value threshold, it is necessary to adjust the air volume of the current biosafety facility ventilation; and control the exhaust air volume of the biosafety facility ventilation to increase and the intake air volume to decrease.

[0081] It should be noted that the preset ventilation adjustment value threshold is set by professionals according to the actual situation, and no specific limitation and elaboration are made.

[0082] In one implementation manner, by comprehensively considering the air quality outlier, the temperature increase outlier, and the personnel fluctuation value to determine whether it is necessary to adjust the ventilation system, it is possible to respond more precisely and efficiently to changes in the laboratory environment. Factors such as air quality, temperature, and personnel activities can all have a significant impact on the safety of the laboratory environment and the spread of pollutants. When the outliers of these indicators reach a certain threshold, it indicates that the pollutant concentration in the laboratory may be too high, or the temperature is too high, or the personnel activities are intensive, all of which may increase the biosafety risk. By weighting these factors and setting reasonable thresholds, the system can automatically determine whether it is necessary to increase the ventilation volume and reduce the intake air volume, thereby effectively controlling the air flow, reducing the risk of pollutant accumulation, and ensuring the stability of the negative pressure environment. In addition, adjusting the ratio of the exhaust air volume to the intake air volume so that the exhaust air volume increases and the intake air volume decreases helps to more quickly remove possible harmful substances in the room, such as volatile organic compounds (VOCs), carbon dioxide, bacteria, and viruses, while preventing external pollutants from entering the laboratory. This control mechanism can not only ensure the stable operation of the biosafety facility, but also make dynamic adjustments according to real-time environmental changes, improve the safety of laboratory operations and air quality, and protect the safety of staff and the external environment.

[0083] Based on the same inventive concept, the embodiment of the present invention also provides a biosafety facility ventilation control system. Refer to Figure 2 , Figure 2 which is a framework diagram of a biosafety facility ventilation control system provided by the embodiment of the present invention. The system is applied to a server, and the server is used to control the biosafety facility to ventilate the room. The system includes:

[0084] Judgment module: Deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors, and analyze and judge whether the current negative pressure environment indoors is qualified based on the air pressure indoors and outdoors;

[0085] Unqualified environment module: If the negative pressure environment indoors is unqualified, control the exhaust air volume of the biosafety facility ventilation to increase and the intake air volume to decrease;

[0086] Abnormal air quality module: If the current negative pressure environment indoors is qualified, obtain the indoor air quality through various types of air quality sensors deployed indoors, calculate the abnormal air quality value, and analyze whether the indoor air quality is abnormal;

[0087] Temperature increase module: If the current negative pressure environment indoors is qualified, obtain the abnormal temperature increase value of the indoor temperature through the temperature sensors deployed indoors, and analyze whether the indoor temperature is too high;

[0088] Personnel fluctuation module: If the current negative pressure environment indoors is qualified, obtain the number of personnel indoors, calculate the personnel fluctuation value, and analyze whether the number of personnel indoors is too large;

[0089] Control and adjustment module: Determine whether it is necessary to control and adjust the air volume of the current biosafety facility ventilation based on the abnormal air quality value, the abnormal temperature increase value, and the personnel fluctuation value, and adjust the negative pressure environment indoors.

[0090] Based on a biosafety facility ventilation control system provided by an embodiment of the present invention, through the above method, it can timely detect whether there is a problem with the negative pressure environment, and timely control the ventilation of the biosafety facility according to the actual situation, adjust the negative pressure environment indoors, ensure that pollutants will not accumulate or spread in the laboratory, reduce the risk of exposure of the staff, will not leak to the environment, and will not endanger the safety of external personnel and the surrounding environment.

[0091] The above has described an embodiment of the present invention in detail, but the content is only a preferred embodiment of the present invention and cannot be used to artificially limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A ventilation control method for a biosafety facility, characterized in that: The method is applied to a server, and the server is used to control indoor ventilation of a biosafety facility, and the method comprises: Deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors, and determine whether the current indoor negative pressure environment is qualified based on the indoor and outdoor air pressure analysis; If the negative pressure environment in the antechamber is not up to standard, the exhaust volume of the ventilation of the biosafety facility will be increased and the intake volume will be reduced; If the current indoor negative pressure environment is qualified, the indoor air quality is obtained through various types of air quality sensors deployed indoors to calculate the air quality abnormality value and analyze whether the indoor air quality is abnormal; If the current indoor negative pressure environment is qualified, the temperature sensor deployed indoors will be used to obtain the indoor temperature abnormality value to analyze whether the indoor temperature is too high; If the current indoor negative pressure environment is qualified, the number of people in the room is obtained to calculate the personnel fluctuation value and analyze whether the number of people in the room is too much; Based on the abnormal air quality values, abnormal temperature rise values ​​and personnel fluctuation values, determine whether it is necessary to control and adjust the ventilation air volume of the current biosafety facility and adjust the negative pressure environment in the room.

2. A ventilation control method for a biosafety facility according to claim 1, characterized in that: The steps to deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors and to determine whether the current indoor negative pressure environment is qualified based on the indoor and outdoor air pressure analysis are as follows: Obtain the indoor and outdoor air pressure at multiple times continuously, and calculate the indoor and outdoor air pressure difference at each time to obtain a time-series air pressure difference sequence; If any of the pressure difference values ​​in the pressure difference sequence is greater than -5Pa, it means that the current negative pressure environment in the room is unqualified. At this time, the exhaust volume of the ventilation of the biosafety facility is increased and the intake volume is reduced; If each pressure difference in the pressure difference sequence is no greater than -5Pa, it means that the current indoor negative pressure environment is qualified. At this time, the ventilation of the biosafety facility remains the same and no adjustment is made for the time being.

3. A biosafety facility ventilation control method according to claim 1, characterized in that: The steps to obtain the indoor air quality and calculate the air quality abnormal value through various types of air quality sensors deployed indoors are as follows: The air quality sensor includes a carbon dioxide sensor, a formaldehyde sensor, a particulate matter sensor, and a volatile organic compound (VOC) sensor; the indoor air parameters collected by the air quality sensors are CO2 concentration, PM2.5 concentration, TVOCs concentration, and formaldehyde concentration; Continuously obtain the indoor CO2 concentration, PM2.5 concentration, TVOCs concentration and formaldehyde concentration at multiple moments, and calculate the maximum CO2 concentration, PM2.5 concentration, TVOCs concentration and formaldehyde concentration with the corresponding maximum concentration thresholds, calculate the difference between the concentration of each air parameter and the corresponding maximum concentration threshold as the abnormal value of the corresponding air parameter, and divide the abnormal value of each air parameter by the corresponding maximum concentration threshold to obtain the abnormal ratio of the corresponding air parameter; The abnormal ratios of all air parameters are added together to obtain the air quality abnormal value.

4. A biosafety facility ventilation control method according to claim 1, characterized in that: The steps for obtaining the abnormal value of indoor temperature increase through the temperature sensor deployed indoors are as follows: The indoor temperature is obtained at multiple times continuously to obtain a temperature signal, and the temperature signal is subjected to a fast Fourier transform to convert the temperature signal from the time domain to the frequency domain to obtain a spectrum diagram; Calculate the amplitude of each frequency component in the spectrum diagram, set an amplitude threshold, calculate the mean amplitude greater than the amplitude threshold, and calculate the difference between the mean and the amplitude threshold, and divide the difference by the amplitude threshold as the temperature increase abnormal value.

5. A biosafety facility ventilation control method according to claim 1, characterized in that: The steps to obtain the number of people in the room and calculate the personnel fluctuation value are as follows: Obtain the number of people in the room and the volume of the movable space in the room, and divide the number of people by the volume of the movable space to obtain an average activity density value, and divide the average activity density value by a preset standard average activity density value to obtain an activity density index; The activity density index within a period of time is continuously obtained and plotted into a time-activity density index curve. The curve is divided into several sub-segments, and clustering is performed according to the slope of each sub-segment to obtain several clusters. Calculate the slope mean of each cluster, calculate the standard deviation of the slope means of all clusters, and divide the standard deviation by the preset standard deviation to obtain the personnel fluctuation value.

6. A biosafety facility ventilation control method according to claim 1, characterized in that: According to the abnormal values ​​of air quality, temperature rise and personnel fluctuation, it is determined whether the ventilation volume of the current biosafety facility needs to be controlled and adjusted. The steps for adjusting the negative pressure environment in the room are as follows: The abnormal value of air quality, the abnormal value of temperature rise and the value of personnel fluctuation are added to obtain the ventilation adjustment value, and the ventilation adjustment value is compared with the preset ventilation adjustment value threshold. If the ventilation adjustment value is less than the preset ventilation adjustment value threshold, there is no need to adjust the ventilation volume of the current biosafety facility; If the ventilation adjustment value is not less than the preset ventilation adjustment value threshold, the air volume of the current biosafety facility ventilation needs to be adjusted; and the exhaust volume of the biosafety facility ventilation is controlled to increase and the intake volume is reduced.

7. A ventilation control system for a biosafety facility, used to implement a ventilation control method for a biosafety facility according to any one of claims 1 to 6, characterized in that: The system is applied to a server, and the server is used to control indoor ventilation of a biosafety facility. The system includes: Judgment module: Deploy pressure sensors indoors and outdoors to monitor the air pressure indoors and outdoors, and determine whether the current indoor negative pressure environment is qualified based on the indoor and outdoor air pressure analysis; Environmental failure module: If the negative pressure environment in the antechamber is not up to standard, the exhaust volume of the ventilation of the biosafety facility will be increased and the intake volume will be reduced; Air quality abnormality module: If the current indoor negative pressure environment is qualified, the indoor air quality is obtained through various types of air quality sensors deployed indoors to calculate the air quality abnormality value and analyze whether the indoor air quality is abnormal; Temperature rise module: If the current indoor negative pressure environment is qualified, the temperature sensor deployed indoors will be used to obtain the indoor temperature rise abnormal value to analyze whether the indoor temperature is too high; People fluctuation module: If the current indoor negative pressure environment is qualified, the number of people in the room is obtained to calculate the people fluctuation value, and analyze whether the number of people in the room is too much; Control and adjustment module: Determine whether it is necessary to control and adjust the ventilation air volume of the current biosafety facility and adjust the negative pressure environment in the room based on abnormal air quality values, abnormal temperature rise values ​​and personnel fluctuation values.

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