Intelligent variable air volume laboratory exhaust system

Abstract

The present application relates to the technical field of laboratory ventilation, and particularly relates to an intelligent variable air volume laboratory exhaust system, which comprises a collection module, a determination module, an exhaust adjustment module, a determination module, a make-up air adjustment module and a correction module. The present application adjusts the exhaust volume according to the risk index calculated based on the target position and the pollutant concentration in real time, determines the air flow channel according to the adjusted exhaust volume and the pollution point position, optimizes the air flow distribution, adjusts the make-up air volume according to the pollution point position, ensures the synergistic effect of the make-up air and the exhaust air, corrects the exhaust volume according to the change of the pollutant concentration, and ensures the long-term stable operation of the system. The present application effectively solves the problems that the fixed air volume and the single signal lead to the difficulty in adapting to the complex and changeable experimental scene, the slow response to the sudden situation, the exhaust lag and the accumulation of laboratory pollutants.

Description

Technical Field

[0001] This invention relates to the field of laboratory ventilation technology, and in particular to an intelligent variable air volume laboratory exhaust system. Background Technology

[0002] As laboratories expand in size and become increasingly complex, their ventilation and exhaust requirements are also diversifying. Traditional fixed-volume exhaust systems often struggle to meet the precise ventilation demands of different experimental scenarios, leading to issues such as pollutant accumulation or energy waste. Especially in the event of sudden pollutant outbreaks or leaks, traditional systems are ill-equipped to effectively control pollutant spread, respond promptly, and quickly adjust the exhaust system. Therefore, intelligent systems capable of dynamically adjusting exhaust and makeup air volumes based on pollutant concentrations to achieve variable-volume exhaust are of paramount importance.

[0003] Chinese Patent Application Publication No. CN119063117A discloses a laboratory ventilation and exhaust variable air volume control system, including a control module, a signal module, and a coordination and correspondence module. The coordination and correspondence module is connected to the signal module and the control module. The signal module inputs a differential pressure preset signal and a static working voltage reference signal to the coordination and correspondence module, and also inputs a fixed exhaust volume or fixed supply volume signal Prot_1. At the same time, it outputs a selection assistance signal corresponding to the fixed volume signal. The coordination and correspondence module detects and converts the input differential pressure preset signal and fixed volume assistance signal, and outputs an exhaust volume adjustment signal Prot_3, which is opposite to the assistance signal and corresponds to the differential pressure preset signal, to the control module. The control module controls the opening degree of the exhaust or supply ventilation facilities.

[0004] Therefore, the aforementioned laboratory ventilation and exhaust variable air volume control system has the following problems: it relies on preset signals, the signal input is fixed, and it cannot adjust the signal input in real time and flexibly according to the dynamic changes in experimental operations, resulting in poor adaptability to different experimental scenarios and difficulty in meeting the diverse and complex ventilation and exhaust needs of the laboratory; it relies on a single signal processing logic, lacks comprehensive consideration of multiple factors inside the laboratory, and cannot achieve precise exhaust and make-up air control, which easily leads to insufficient or excessive exhaust, affecting the ventilation effect and energy utilization efficiency of the laboratory. Summary of the Invention

[0005] To address this, the present invention provides an intelligent variable air volume laboratory exhaust system, which overcomes the problems of existing technologies, such as difficulty in adapting to complex and ever-changing experimental scenarios and slow response to emergencies due to fixed air volume and reliance on a single signal, resulting in delayed exhaust and accumulation of laboratory pollutants, through multi-dimensional data analysis and dynamic adjustment mechanisms.

[0006] To achieve the above objectives, the present invention provides an intelligent variable air volume laboratory exhaust system, comprising:

[0007] The data acquisition module is used to collect in real time the target location and the pollutant concentration of each test point in each monitoring area based on the location of the exhaust vents during the operation of each exhaust vent with a preset exhaust volume and each make-up vent with a preset make-up volume.

[0008] A determination module, which is connected to the acquisition module, is used to determine several risk areas based on the pollutant concentration in each of the monitoring areas;

[0009] An exhaust adjustment module, which is connected to the acquisition module and the determination module respectively, is used to determine several risk indices based on the target location and pollutant concentration of each pollution point in each risk area, and adjust the preset exhaust volume of all exhaust outlets based on all risk indices to obtain several adjusted exhaust volumes.

[0010] The determination module is connected to the exhaust adjustment module and the acquisition module respectively, and is used to determine a number of test channels based on the adjusted exhaust volume and the location of each pollution point, and to determine a number of airflow channels based on the target location of each test channel.

[0011] The make-up air adjustment module is connected to the determination module and the acquisition module respectively. It is used to determine a number of risk make-up air ports according to the location of each pollution point and each airflow channel, and adjust the preset make-up air volume of all the make-up air ports in combination with the location of each risk exhaust port to obtain a number of adjusted make-up air volumes.

[0012] A correction module, which is connected to the exhaust adjustment module and the make-up air adjustment module respectively, is used to correct each of the adjusted exhaust volumes based on all the adjusted exhaust volumes and all the adjusted make-up air volumes, according to the concentration of all the pollutants within a preset correction time, to obtain a number of corrected exhaust volumes.

[0013] Furthermore, the determining module includes:

[0014] An adjacent distance calculation unit is used to calculate several adjacent distances based on the positions of all adjacent pollution points within the risk area;

[0015] The first endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is greater than the maximum value of the preset distance range, it selects a selected point arc with a preset length, which has the distance from the pollution point to the risk outlet as the radius, the risk outlet as the center, and the pollution point position as the midpoint of the arc. It also determines several endpoints to be measured based on all points on the selected point arc with an adjacent preset first width.

[0016] The second endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is less than the minimum value of the preset distance range, the adjacent pollution points are merged and recorded as merged pollution points. The selected point arc is selected with the distance from the merged pollution point to the risk outlet as the radius, the risk outlet as the center, and the position of the merged pollution point as the midpoint of the arc. A number of endpoints to be measured are determined based on all points on the selected point arc that are adjacent to the preset first width.

[0017] The third endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is within the preset distance range, it connects the adjacent pollution points to obtain the selected point segment, and determines a number of the endpoints to be measured based on all points adjacent to the preset first width on the selected point segment.

[0018] The test channel determination unit is connected to the first endpoint determination unit, the second endpoint determination unit and the third endpoint determination unit respectively, to connect the test endpoint and the risk outlet, determine the channel direction, and determine a number of test channels based on a preset channel width;

[0019] An airflow channel determination unit, connected to the test channel determination unit, is used to determine a plurality of airflow channels based on the target position of each test channel and the position coordinates of the test endpoint.

[0020] Furthermore, the airflow channel determining unit includes:

[0021] The target quantity fluctuation calculation unit is used to count the target quantity of the channel based on all the target positions in the channel to be measured within the preset channel width, and to calculate the standard deviation of the target quantity of the channel within a preset time period to obtain the target quantity fluctuation value.

[0022] A temporary channel determination subunit is used to determine several temporary channels based on the comparison result between the target quantity fluctuation value and the preset target quantity fluctuation threshold.

[0023] An adjacent length calculation subunit, which is connected to the temporary channel determination subunit, is used to calculate several adjacent lengths based on the position coordinates of the temporary endpoints of each temporary channel and the position coordinates of each contamination point.

[0024] An airflow channel determination subunit is connected to the adjacent length calculation subunit to compare each of the adjacent lengths and determine the temporary channel corresponding to the smallest adjacent length among all adjacent lengths as the airflow channel, thereby determining several airflow channels;

[0025] The exclusion subunit, which is connected to the airflow channel determining subunit, is used to sort the airflow channels in descending order of length when all the airflow channels have the same direction and overlap, retaining only the longest airflow channel and excluding all other airflow channels.

[0026] Furthermore, the make-up air adjustment module includes:

[0027] The risk filler is determined by a filler unit, which determines a number of risk fillers based on the location coordinates of the channel endpoints and the location coordinates of the contaminated points, wherein the risk fillers include a number of first fillers and a number of second fillers;

[0028] The distance calculation unit is adjusted to calculate several risk distances based on the location coordinates of the channel endpoint and the location coordinates of the risk outlet, and to calculate several pollution distances based on the location coordinates of the channel endpoint and the location coordinates of the pollution point;

[0029] The first make-up air volume adjustment unit is connected to the make-up port determination unit and the adjustment distance calculation unit respectively, and is used to adjust the preset make-up air volume of the first make-up port according to the risk distance and the preset make-up air adjustment coefficient to obtain a number of the adjusted make-up air volumes;

[0030] The second make-up air volume adjustment unit is connected to the make-up port determination unit and the adjustment distance calculation unit respectively, and is used to adjust the preset make-up air volume of the second make-up port with the pollution distance and the preset make-up air adjustment coefficient to obtain a number of the adjusted make-up air volumes;

[0031] A general air supply adjustment unit is connected to the first air supply adjustment unit and the second air supply adjustment unit respectively. It is used to calculate the change in air supply volume based on the preset air supply volume and the adjusted air supply volume of each of the first and second air supply ports, and adjust the preset air supply volume of each general air supply port according to the change in air supply volume to obtain several adjusted air supply volumes.

[0032] Wherein, the channel endpoint is the endpoint of the airflow channel other than the risk outlet, and the general replenishment port is the replenishment port other than the first replenishment port and the second replenishment port among all the replenishment ports.

[0033] Furthermore, the patching determination unit includes:

[0034] The first replenishment port determination subunit is used to connect the risk outlet and the channel end point. Extending from the risk outlet as the origin to the channel end point, a reverse airflow ray is obtained. The replenishment port that the reverse airflow ray first meets after passing the channel end point is determined as the first replenishment port, so as to determine a number of first replenishment ports.

[0035] The second replenishment port determination subunit is used to connect the pollution point and the channel endpoint. Extending from the channel endpoint as the origin towards the pollution point, an intermediate ray is obtained. The replenishment port that the intermediate ray first encounters after passing the pollution point is determined as the second replenishment port, thereby determining a number of second replenishment ports.

[0036] Furthermore, the exhaust adjustment module includes:

[0037] The risk index determination unit is used to determine the risk index based on the target location, the pollutant concentration, the preset target weight, and the preset concentration weight within a preset risk determination time period.

[0038] An exhaust adjustment unit, connected to the risk index determination unit, is used to adjust the preset exhaust volume of the exhaust port according to the risk index to obtain several adjusted exhaust volumes.

[0039] Furthermore, the risk index determination unit includes:

[0040] The rate of change calculation subunit is used to count the target quantity in the area based on all the target locations in the risk area, calculate the target rate of change based on the target quantity in the area within the preset risk determination time period, and calculate the concentration rate of change based on the concentration of all the pollutants within the preset risk determination time period.

[0041] The risk index determination subunit is connected to the change rate calculation subunit and is used to determine the risk index based on the target change rate, the concentration change rate, the preset target weight, and the preset concentration weight.

[0042] Furthermore, the exhaust adjustment unit includes:

[0043] The risk exhaust adjustment subunit is used to adjust the preset exhaust volume of each risk exhaust outlet according to each risk index and the preset exhaust adjustment coefficient to obtain a number of adjusted exhaust volumes;

[0044] An exhaust volume change calculation subunit, which is connected to the risk exhaust volume adjustment subunit, is used to calculate the exhaust volume change based on the preset exhaust volume and the adjusted exhaust volume of each risk exhaust outlet.

[0045] The general exhaust adjustment subunit is connected to the exhaust change calculation subunit to adjust the preset exhaust volume of each general exhaust outlet according to the exhaust volume change, so as to obtain several adjusted exhaust volumes.

[0046] Wherein, the risk outlet is the exhaust outlet corresponding to the risk area, and the general outlet is the exhaust outlet other than the risk outlet among all exhaust outlets.

[0047] Furthermore, the determination module includes:

[0048] A pollution point determination unit is used to determine several pollution points based on the comparison result between the pollutant concentration and a preset concentration threshold.

[0049] A risk determination unit, connected to the pollution point determination unit, is used to determine several risk areas based on the comparison result between the number of pollution points in each monitoring area and a preset number threshold.

[0050] Furthermore, the correction module includes:

[0051] A concentration reduction rate calculation unit is used to determine the concentration reduction rate based on the concentrations of all pollutants within the preset correction time period;

[0052] A correction unit, connected to the concentration decrease rate calculation unit, is used to correct each of the adjusted exhaust volumes based on the comparison result between the concentration decrease rate and the preset decrease rate threshold, thereby obtaining several corrected exhaust volumes.

[0053] Compared with existing technologies, the beneficial effects of this invention are as follows: By real-time monitoring of target locations and pollutant concentrations within each monitoring area, risk areas are determined based on pollutant concentrations. A risk index is calculated based on the target locations and pollutant concentrations within the risk areas, and the exhaust volume is adjusted accordingly. The test channel and airflow channel are determined based on the adjusted exhaust volume and the location of the pollution point, optimizing airflow distribution. The make-up air volume is adjusted in conjunction with the airflow channel and pollution point location to ensure the synergistic effect of make-up and exhaust air, maintaining airflow balance within the laboratory. The exhaust volume is corrected based on changes in pollutant concentration to ensure long-term stable operation of the system. Through multi-dimensional data acquisition and dynamic adjustment, refined management and optimized control of the laboratory ventilation environment are achieved, thereby improving energy efficiency, protecting the health of laboratory personnel, and ensuring the safety and comfort of the experimental environment. This effectively solves the problems of slow exhaust and pollutant accumulation in the laboratory caused by fixed airflow and reliance on a single signal, which makes it difficult to adapt to complex and changing experimental scenarios and slows down the response to emergencies.

[0054] Furthermore, through stratified screening, specific contamination points are first accurately identified by comparing pollutant concentrations with preset concentration thresholds. This ensures that only when pollutant concentrations reach levels that may pose a threat to human health or experimental safety are they marked as contamination points. Subsequently, by comparing the number of contamination points in each monitoring area with preset threshold numbers, risk areas are further determined. This process, moving from points to regions, not only accurately locates the source of pollution but also effectively assesses the pollution risk level of the entire monitoring area.

[0055] Furthermore, by comprehensively considering the target location, pollutant concentration, and corresponding preset weights within a predetermined risk period, a risk index is calculated to fully reflect the impact of various factors on ventilation demand, ensuring the scientific and rational nature of exhaust adjustment. Subsequently, the preset exhaust volume of the exhaust vents is adjusted based on the risk index to achieve precise exhaust control. Through weighted analysis of multi-dimensional data, the exhaust volume is dynamically adjusted to adapt to real-time changes within the laboratory, thereby optimizing ventilation, improving energy efficiency, and ensuring the safety and comfort of the laboratory environment.

[0056] Furthermore, by calculating the rate of change of regional target quantities and pollutant concentrations within a preset risk determination period, the system can dynamically reflect the real-time changing trends of the laboratory environment, rather than merely providing static numerical levels. Subsequently, the target change rate and concentration change rate are weighted and summed with preset weights to obtain a risk index. This fully considers the importance of different factors to the risk, ensuring the scientific rigor and flexibility of the risk assessment. Through dynamic monitoring and weighted evaluation, the system can more accurately identify and quantify the risk level within the laboratory, thereby providing a more accurate basis for subsequent exhaust adjustments. This enables intelligent and refined management of the ventilation system, effectively ensuring the safety and comfort of the laboratory environment.

[0057] Furthermore, by increasing the exhaust volume of risk vents based on the risk index and preset exhaust adjustment coefficient, it is ensured that pollutants in the risk area can be quickly discharged, thereby effectively reducing the pollutant concentration in the risk area. Subsequently, the change in exhaust volume is calculated, providing a quantitative basis for the overall exhaust adjustment of the system. The change in exhaust volume is evenly distributed to general vents, and their preset exhaust volumes are reduced accordingly to balance the ventilation system of the entire laboratory. This avoids insufficient ventilation or energy waste in other areas due to the increase in local exhaust volume. By dynamically adjusting the exhaust volume of risk areas and rationally allocating the exhaust volume of general vents, the system can achieve refined management of laboratory ventilation, optimize energy utilization efficiency, and ensure that the air quality in the laboratory is always within a safe range.

[0058] Furthermore, by classifying the distances between pollution points, different methods are used to determine the endpoints to be measured based on different distance conditions. When the adjacent distances are too large, the endpoints to be measured are determined by selecting point arcs to ensure effective monitoring of isolated pollution points; when the adjacent distances are too small, pollution points are merged before determining the endpoints to be measured to avoid duplicate monitoring caused by excessively dense pollution points; when the adjacent distances are in the middle range, the endpoints to be measured are determined by selecting point line segments, balancing the comprehensiveness and efficiency of monitoring. Based on the endpoints to be measured and the target location, the layout of the airflow channels is further optimized. The layered and classified determination can flexibly adjust the monitoring and ventilation strategies according to the actual distribution of pollution points, ensuring that the ventilation system can accurately and efficiently respond to the diffusion of pollutants in different scenarios.

[0059] Furthermore, by calculating the target volume fluctuation value and comparing it with a preset target volume fluctuation threshold, potential airflow channels are screened. Lower target volume fluctuation values ​​indicate relatively stable changes in the number of people within the channel, and these channels are considered temporary channels. Subsequently, the distance between the endpoint of the temporary channel and the contamination point is calculated to provide data support for subsequent channel optimization. By comparing these distances, the temporary endpoint corresponding to the optimal adjacent length is selected as the channel endpoint, thus determining the final airflow channel. Distance-based optimization ensures the effectiveness and rationality of the airflow channels. Finally, airflow channels with the same direction and coverage are compared and corrected in length, eliminating shorter channels and further optimizing the layout of the airflow channels to avoid resource waste and low ventilation efficiency.

[0060] Furthermore, by accurately identifying the location coordinates of the channel endpoints and contamination points, risk-prone air supply points, including the first and second supply points, are precisely identified to ensure that the supply air directly affects critical areas. Risk distance refers to the relative positional relationship between the channel endpoint and the risk exhaust outlet, while contamination distance refers to the relative positional relationship between the contamination point and the channel endpoint. Based on the risk and contamination distances, and combined with a preset supply air adjustment coefficient, the supply air volume at the corresponding supply air outlet is dynamically increased to achieve targeted supply air to risk and contaminated areas. By calculating the change in supply air volume and evenly distributing it to general supply outlets, the supply air distribution throughout the laboratory is optimized, avoiding excessive or insufficient supply air in certain areas. Through precise positioning, quantitative calculation, and dynamic adjustment, refined management of the laboratory ventilation environment is achieved, ensuring the synergistic effect of supply and exhaust air and maintaining airflow balance within the laboratory.

[0061] Furthermore, the location of the make-up air inlets is determined using reverse airflow rays and intermediate rays, starting from both the risk outlet and the pollution point. Precise positioning of the make-up air inlets ensures that the make-up air directly targets the risk area and pollution source. The use of reverse airflow rays and intermediate rays not only considers the directionality of airflow but also optimizes the make-up air path by identifying the first point of contact, avoiding inefficient ventilation due to excessively long make-up air paths. Dynamic adjustment of the make-up air strategy ensures synergy between make-up and exhaust air, improving the efficiency and reliability of the ventilation system.

[0062] Furthermore, by monitoring the rate of change in pollutant concentration within a preset correction period in real time, the actual effectiveness of the ventilation system can be accurately assessed. When the concentration reduction rate is lower than the preset reduction rate threshold, it indicates that the current exhaust volume is insufficient to effectively reduce the pollutant concentration. Therefore, based on the deviation between the concentration reduction rate and the threshold, as well as the preset correction coefficient, the exhaust volume is dynamically increased and adjusted. This dynamic correction based on real-time data feedback ensures that the ventilation system is always in optimal operating condition, and the exhaust volume is adjusted in a timely manner to meet the actual needs of the laboratory. Attached Figure Description

[0063] Figure 1This is a schematic diagram of the intelligent variable air volume laboratory exhaust system described in this embodiment;

[0064] Figure 2 This is a logic diagram for determining risk areas in the determination module of this embodiment;

[0065] Figure 3 This is a logic diagram for determining the temporary channel in the airflow channel determination unit of this embodiment;

[0066] Figure 4 The logic diagram for determining the adjustment of exhaust volume in the correction module of this embodiment is shown below. Detailed Implementation

[0067] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0068] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0069] Please see Figure 1 As shown, this is a schematic diagram of the intelligent variable air volume (VAV) laboratory exhaust system described in this embodiment. This embodiment provides an intelligent VAV laboratory exhaust system, including:

[0070] The data acquisition module is used to collect in real time the target location and the pollutant concentration of each test point in each monitoring area based on the location of the exhaust vents during the operation of each exhaust vent with a preset exhaust volume and each make-up vent with a preset make-up volume.

[0071] A determination module, which is connected to the acquisition module, is used to determine several risk areas based on the pollutant concentration in each of the monitoring areas;

[0072] An exhaust adjustment module, which is connected to the acquisition module and the determination module respectively, is used to determine several risk indices based on the target location and pollutant concentration of each pollution point in each risk area, and adjust the preset exhaust volume of all exhaust outlets based on all risk indices to obtain several adjusted exhaust volumes.

[0073] The determination module is connected to the exhaust adjustment module and the acquisition module respectively, and is used to determine a number of test channels based on the adjusted exhaust volume and the location of each pollution point, and to determine a number of airflow channels based on the target location of each test channel.

[0074] The make-up air adjustment module is connected to the determination module and the acquisition module respectively. It is used to determine a number of risk make-up air ports according to the location of each pollution point and each airflow channel, and adjust the preset make-up air volume of all the make-up air ports in combination with the location of each risk exhaust port to obtain a number of adjusted make-up air volumes.

[0075] A correction module, which is connected to the exhaust adjustment module and the make-up air adjustment module respectively, is used to correct each of the adjusted exhaust volumes based on all the adjusted exhaust volumes and all the adjusted make-up air volumes, according to the concentration of all the pollutants within a preset correction time, to obtain a number of corrected exhaust volumes.

[0076] In this embodiment, sudden contaminant leaks are a common risk in laboratory environments. For example, during chemical experiments, improper operation or equipment malfunction may lead to leaks of harmful gases or liquids. In such cases, the laboratory's ventilation system needs to be able to respond quickly to prevent the spread of contaminants and protect the health and safety of laboratory personnel.

[0077] In this embodiment, the laboratory exhaust system divides the entire laboratory into multiple monitoring areas based on the location of the exhaust vents. Each monitoring area corresponds to one exhaust vent, and the exhaust vent is located at the center of the monitoring area. Several make-up air vents are evenly distributed throughout the laboratory, and each monitoring area has several make-up air vents. Initially, each exhaust vent of the exhaust system operates at a preset exhaust volume, and each make-up air vent operates at a preset make-up air volume. The total exhaust volume and total make-up air volume maintain the initial internal and external pressure difference. During the intelligent variable air volume exhaust process, the total exhaust volume, total make-up air volume, and internal and external pressure difference remain unchanged. The test point refers to the location within the monitoring area where the experiment will be conducted. During the experiment, pollutants may be released, threatening the life safety of the experimenters.

[0078] In this embodiment, the volume of the monitoring area is 60m³. 3 The preset exhaust volume refers to the low-power exhaust flow rate of the laboratory exhaust system under safe conditions. It depends on the laboratory's area, height, type of experiment, equipment layout, and safety standards, and is usually set at 360m. 3 / h to 720m 3 Between / h. In this embodiment, it is set to 600m. 3 / h can effectively maintain air quality in the laboratory with minimal power, while avoiding energy waste caused by excessive exhaust ventilation.

[0079] In this embodiment, eight make-up air inlets are evenly distributed in each monitoring area. The preset make-up air volume refers to the low-power make-up air flow rate of the laboratory exhaust system under safe conditions, which depends on the laboratory's exhaust volume, room pressure balance requirements, and the design of the ventilation system, and is usually set at 60m. 3 / h to 75m 3 Between / h. In this embodiment, it is set to 67m.3 / h, to effectively maintain a negative pressure state in the laboratory, prevent pollutants from overflowing, and ensure indoor air circulation.

[0080] In this embodiment, the target location refers to the location of the experimenter. A camera captures real-time images of the laboratory, and computer vision technology (such as deep learning algorithms) is used to identify the experimenter's location. The pollutant concentration refers to the amount of pollutants at each experimental point in the laboratory, which is related to whether the air quality in the laboratory meets safety standards. This concentration is collected by gas sensors installed at each experimental point.

[0081] The preset correction time refers to the length of time used to assess changes in pollutant concentration. It depends on the response speed of the laboratory's ventilation system, the complexity of the experimental operation, and the expected ventilation effect, and is typically set between 30 seconds and 5 minutes. In this embodiment, it is set to 2 minutes to ensure the system has sufficient time to assess changes in pollutant concentration while avoiding excessively long waiting times, thus ensuring the ventilation system's rapid response and efficient operation.

[0082] By monitoring the target locations and pollutant concentrations within each monitoring area in real time, risk areas are identified based on pollutant concentrations. A risk index is calculated based on the target locations and pollutant concentrations within the risk areas, and the exhaust volume is adjusted accordingly. The measured channels and airflow channels are determined based on the adjusted exhaust volume and the location of the pollution point, optimizing airflow distribution. The makeup air volume is adjusted in conjunction with the airflow channels and pollution point locations to ensure the synergistic effect of makeup air and exhaust air, maintaining airflow balance within the laboratory. The exhaust volume is corrected based on changes in pollutant concentration to ensure long-term stable operation of the system. Through multi-dimensional data acquisition and dynamic adjustment, refined management and optimized control of the laboratory ventilation environment are achieved, thereby improving energy efficiency, protecting the health of laboratory personnel, and ensuring the safety and comfort of the experimental environment. This effectively solves the problems of slow exhaust and pollutant accumulation in the laboratory caused by fixed airflow and reliance on a single signal, which makes it difficult to adapt to complex and changing experimental scenarios and slows down the response to emergencies.

[0083] Please see Figure 2 As shown, this is a logic diagram for determining risk areas by the determination module in this embodiment. In this embodiment, the determination module includes:

[0084] A contamination point determination unit is used to determine the test point as the contamination point when the contaminant concentration is greater than a preset concentration threshold, thereby determining a number of contamination points;

[0085] A risk determination unit, connected to the pollution point determination unit, is used to determine that a monitoring area is a risk area when the number of pollution points in each monitoring area is greater than a preset number threshold, thereby determining several risk areas.

[0086] The preset concentration threshold is the upper limit of pollutant concentration used to determine whether a test point is a contamination point. It depends on the type of pollutants that may be generated in the laboratory, the safety standards of the experimental operation, and the requirements for protecting personnel health, and is typically set between 10 ppm and 50 ppm. In this embodiment, it is set to 30 ppm, which can effectively identify potential contamination risks while ensuring the health of laboratory personnel and ensuring a safe laboratory environment.

[0087] The preset threshold number is the upper limit of the number of contaminated points used to determine whether an area is a risk area. It depends on the laboratory layout, the complexity of the experimental operation, and the requirements for ventilation safety, and is typically set between 1 and 5 contaminated points. In this embodiment, it is set to 2 contaminated points to accurately identify risk areas and optimize system operating efficiency.

[0088] Through stratified screening, specific contamination points are first accurately identified by comparing pollutant concentrations with preset concentration thresholds. This ensures that only when pollutant concentrations reach levels that may pose a threat to human health or experimental safety are they marked as contamination points. Subsequently, by comparing the number of contamination points in each monitoring area with preset threshold numbers, risk areas are further determined. This process, moving from points to regions, not only accurately locates the source of pollution but also effectively assesses the pollution risk level of the entire monitoring area.

[0089] Specifically, the exhaust adjustment module includes:

[0090] The risk index determination unit is used to determine the risk index based on the target location, the pollutant concentration, the preset target weight, and the preset concentration weight within a preset risk determination time period.

[0091] An exhaust adjustment unit, connected to the risk index determination unit, is used to adjust the preset exhaust volume of the exhaust port according to the risk index to obtain several adjusted exhaust volumes.

[0092] By comprehensively considering the target location, pollutant concentration, and corresponding preset weights within a predetermined risk period, a risk index is calculated. This index fully reflects the impact of various factors on ventilation requirements, ensuring the scientific and rational nature of exhaust adjustments. Subsequently, the preset exhaust volume of the exhaust vents is adjusted based on the risk index to achieve precise exhaust control. Through weighted analysis of multi-dimensional data, the exhaust volume is dynamically adjusted to adapt to real-time changes within the laboratory, thereby optimizing ventilation, improving energy efficiency, and ensuring the safety and comfort of the laboratory environment.

[0093] Specifically, the risk index determination unit includes:

[0094] The rate of change calculation subunit is used to count the target quantity in the area based on all the target locations in the risk area, and to calculate the rate of change of all the target quantities in the area within the preset risk determination time to obtain the target rate of change, and to calculate the rate of change of all the pollutant concentrations within the preset risk determination time to obtain the concentration rate of change.

[0095] The risk index determination subunit is connected to the change rate calculation subunit and is used to perform a weighted summation of the target change rate, the concentration change rate, the preset target weight, and the preset concentration weight to obtain the risk index.

[0096] The preset target weight is a standard value used to measure the impact of changes in the target quantity on risk. It depends on the importance of the target quantity in the laboratory ventilation system and its impact on experimental safety and personnel health, and is usually set between 0.3 and 0.7. In this embodiment, it is set to 0.5, which can balance the contribution of changes in the target quantity and changes in pollutant concentration to the risk, ensuring a more comprehensive and accurate risk assessment.

[0097] The preset concentration weight is a standard value used to measure the impact of changes in pollutant concentration on risk. It depends on the importance of the pollutant concentration in the laboratory ventilation system and its impact on experimental safety and personnel health, and is usually set between 0.3 and 0.7. In this embodiment, it is set to 0.5, which can balance the contribution of concentration changes and target quantity changes to risk, ensuring a more comprehensive and accurate risk assessment.

[0098] By calculating the rate of change of regional target quantities and pollutant concentrations within a preset risk determination period, the system can dynamically reflect the real-time changing trends of the laboratory environment, rather than just static numerical levels. Subsequently, the target change rate and concentration change rate are weighted and summed with preset weights to obtain a risk index. This fully considers the importance of different factors to the risk, ensuring the scientific rigor and flexibility of the risk assessment. Through dynamic monitoring and weighted evaluation, the system can more accurately identify and quantify the risk level within the laboratory, providing a more accurate basis for subsequent ventilation adjustments. This enables intelligent and refined management of the ventilation system, effectively ensuring the safety and comfort of the laboratory environment.

[0099] Specifically, the exhaust adjustment unit includes:

[0100] The risk exhaust adjustment subunit is used to increase the preset exhaust volume of each risk exhaust outlet according to each risk index and the preset exhaust adjustment coefficient to obtain a number of adjusted exhaust volumes, where L1=L×(1+a×M), L1 is the adjusted exhaust volume, L is the preset exhaust volume, a is the preset exhaust adjustment coefficient, and M is the risk index (0≤M≤1).

[0101] The exhaust volume change calculation subunit is connected to the risk exhaust volume adjustment subunit. It is used to calculate the difference between the adjusted exhaust volume and the preset exhaust volume of each risk exhaust outlet to obtain several exhaust volume increases, and to calculate the sum of all exhaust volume increases to obtain the exhaust volume change.

[0102] The general exhaust adjustment subunit is connected to the exhaust change calculation subunit to evenly distribute the exhaust volume change to all general exhaust outlets to obtain the general exhaust volume. Based on the general exhaust volume, the preset exhaust volume of each general exhaust outlet is reduced to obtain several adjusted exhaust volumes, where L2=L-L', L2 is the adjusted exhaust volume, L is the preset exhaust volume, and L' is the general exhaust volume.

[0103] Wherein, the risk outlet is the exhaust outlet corresponding to the risk area, and the general outlet is the exhaust outlet other than the risk outlet among all exhaust outlets.

[0104] The preset exhaust adjustment coefficient is a factor used to dynamically increase the exhaust volume based on the risk index. It depends on the laboratory's ventilation system design, the complexity of the experimental operation, and the requirements for pollutant control, and is typically set between 1.2 and 2.0. In this embodiment, it is set to 1.5, which ensures that the exhaust volume in the risk area is sufficient to quickly reduce pollutant concentration while avoiding energy waste caused by excessive exhaust.

[0105] By increasing the exhaust volume of high-risk vents based on the risk index and preset exhaust adjustment coefficient, the system ensures that pollutants in high-risk areas are quickly discharged, effectively reducing pollutant concentrations within these areas. Subsequently, the change in exhaust volume is calculated, providing a quantitative basis for overall system exhaust adjustment. This change in exhaust volume is then evenly distributed to general vents, with their preset exhaust volumes reduced accordingly. This balances the entire laboratory's ventilation system, preventing insufficient ventilation or energy waste in other areas due to increased local exhaust volumes. By dynamically adjusting the exhaust volume in high-risk areas and rationally allocating exhaust volumes to general vents, the system achieves refined management of laboratory ventilation, optimizes energy efficiency, and ensures that air quality within the laboratory remains within safe limits.

[0106] Specifically, the determining module includes:

[0107] The adjacent distance calculation unit is used to calculate the Euclidean distance between adjacent pollution points within the risk area to obtain several adjacent distances;

[0108] The first endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is greater than the maximum value of the preset distance range, it selects a selected point arc with a preset length, which has the distance from the pollution point to the risk outlet as the radius, the risk outlet as the center, and the pollution point position as the midpoint of the arc. It also determines several endpoints to be measured based on all points on the selected point arc with an adjacent preset first width.

[0109] The second endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is less than the minimum value of the preset distance range, the adjacent pollution points are merged and recorded as merged pollution points. The selected point arc is selected with the distance from the merged pollution point to the risk outlet as the radius, the risk outlet as the center, and the position of the merged pollution point as the midpoint of the arc. A number of endpoints to be measured are determined based on all points on the selected point arc that are adjacent to the preset first width.

[0110] The third endpoint determination unit is connected to the adjacent distance calculation unit. When the adjacent distance is greater than the minimum value of the preset distance range and the adjacent distance is less than the maximum value of the preset distance range, it connects the adjacent pollution points to obtain the selected point segment, and determines a number of the endpoints to be measured based on all points adjacent to the preset first width on the selected point segment.

[0111] The test channel determination unit is connected to the first endpoint determination unit, the second endpoint determination unit and the third endpoint determination unit respectively, to connect the test endpoint and the risk outlet, determine the channel direction, and determine a number of test channels based on a preset channel width;

[0112] An airflow channel determination unit, connected to the test channel determination unit, is used to determine a plurality of airflow channels based on the target position of each test channel and the position coordinates of the test endpoint.

[0113] The preset distance range is an interval used to determine the relationship between contamination points. It depends on the layout of the laboratory, the distribution density of contamination points, and the exhaust capacity of the ventilation system, and is usually set between [0.5 meters, 2 meters]. In this embodiment, it is set to [0.8 meters, 1.5 meters], which can effectively distinguish the relationship between contamination points, avoiding excessive merging of contamination points while ensuring the correlation between them.

[0114] The preset length refers to the length of the arc used to determine the location of the endpoint to be measured. It depends on the laboratory's ventilation system design and the distribution range of contamination points, and is typically set between 1 and 3 meters. In this embodiment, it is set to 2 meters to ensure that the arc covers a sufficient area, thereby more comprehensively determining the endpoint to be measured.

[0115] The preset first width refers to the distance between adjacent points on the selected arc of the endpoints to be measured, which determines the density of the endpoints to be measured. It depends on the accuracy of the laboratory's ventilation system and the distribution density of contamination points, and is usually set between 0.1 meters and 0.5 meters. In this embodiment, it is set to 0.3 meters to ensure that the distribution of the endpoints to be measured is neither too sparse nor too dense, thereby improving the efficiency of the ventilation system.

[0116] The preset channel width refers to the channel width used to determine the channel range. It depends on the laboratory's ventilation system design and airflow distribution requirements, and is usually set between 0.3 meters and 1 meter. In this embodiment, it is set to 0.5 meters to ensure that the airflow channel has sufficient space, thereby improving the efficiency of the ventilation system and the uniformity of airflow distribution.

[0117] By classifying the distances between pollution points, different methods are used to determine the endpoints to be monitored based on different distance conditions. When the adjacent distances are too large, the endpoints to be monitored are determined by selecting point arcs to ensure effective monitoring of isolated pollution points. When the adjacent distances are too small, pollution points are merged before determining the endpoints to be monitored to avoid duplicate monitoring caused by excessively dense pollution points. When the adjacent distances are in the middle range, the endpoints to be monitored are determined by selecting point line segments, balancing the comprehensiveness and efficiency of monitoring. Based on the endpoints to be monitored and the target location, the layout of the airflow channels is further optimized. The layered and classified determination can flexibly adjust the monitoring and ventilation strategies according to the actual distribution of pollution points, ensuring that the ventilation system can accurately and efficiently respond to the diffusion of pollutants in different scenarios.

[0118] Please see Figure 3 As shown, this is a logic diagram for determining a temporary channel by the airflow channel determination unit in this embodiment. In this embodiment, the airflow channel determination unit includes:

[0119] The target quantity fluctuation calculation unit is used to count the target quantity of the channel based on all the target positions in the channel to be measured within the preset channel width, and to calculate the standard deviation of the target quantity of the channel within a preset time period to obtain the target quantity fluctuation value.

[0120] A temporary channel determination subunit is used to determine the channel under test as a temporary channel when the target quantity fluctuation value is less than a preset target quantity fluctuation threshold, and to determine several temporary channels.

[0121] An adjacent length calculation subunit, which is connected to the temporary channel determination subunit, is used to calculate the Euclidean distance between the position coordinates of the temporary endpoints of each temporary channel and the position coordinates of each contamination point to obtain several adjacent lengths;

[0122] An airflow channel determination subunit is connected to the adjacent length calculation subunit to compare each adjacent length, determine the smallest adjacent length among all adjacent lengths as the optimal adjacent length, determine the temporary endpoint corresponding to the optimal adjacent length as the channel endpoint, thereby determining several channel endpoints, and determining the corresponding temporary channel as the airflow channel based on the channel endpoints, thereby determining several airflow channels.

[0123] The exclusion subunit, which is connected to the airflow channel determining subunit, is used to sort the airflow channels in descending order of length when all the airflow channels have the same direction and overlap, retaining only the longest airflow channel and excluding all other airflow channels.

[0124] The preset duration is the length of time used for statistical analysis of changes in the target quantity. It depends on the dynamic characteristics of pollutant concentration changes during the experiment, the type of experiment, and the system's real-time requirements, and is typically set between 30 seconds and 2 minutes. In this embodiment, it is set to 2 minutes to ensure sufficient data statistics while quickly responding to fluctuations in the target quantity.

[0125] The preset target quantity fluctuation threshold is a benchmark value used to determine whether the target quantity fluctuation is safe. It depends on the layout of the laboratory, the complexity of the experimental operation, and the requirements for personnel safety and ventilation. In this embodiment, it is set between 10% and 30%. In this embodiment, it is set to 20%, which can effectively filter out channels with smaller target quantity fluctuations, while avoiding misjudgments caused by excessively high thresholds, thus ensuring the safety of experimental personnel.

[0126] By calculating the target volume fluctuation value and comparing it with a preset target volume fluctuation threshold, potential airflow channels are screened. When the target volume fluctuation value is low, it indicates that the number of people in the channel changes relatively little and is relatively stable; these are considered temporary channels. Subsequently, the distance between the endpoint of the temporary channel and the contamination point is calculated to provide data support for subsequent channel optimization. By comparing these distances, the temporary endpoint corresponding to the optimal adjacent length is selected as the channel endpoint, thus determining the final airflow channel. Distance-based optimization ensures the effectiveness and rationality of the airflow channels. Finally, airflow channels with the same direction and coverage are compared and corrected in length, eliminating shorter channels and further optimizing the layout of the airflow channels to avoid resource waste and low ventilation efficiency.

[0127] Specifically, the air supply adjustment module includes:

[0128] The risk filler is determined by a filler unit, which determines a plurality of risk fillers based on the position coordinates of the channel endpoints and the position coordinates of the contamination points, wherein the risk fillers include a plurality of first fillers and a plurality of second fillers;

[0129] The distance calculation unit is adjusted to calculate the Euclidean distance between the position coordinates of the channel endpoint and the position coordinates of the risk outlet, thereby obtaining several risk distances; and the Euclidean distance between the position coordinates of the channel endpoint and the position coordinates of the contaminated point is calculated, thereby obtaining several contamination distances.

[0130] The first make-up air volume adjustment unit is connected to the make-up port determination unit and the adjustment distance calculation unit respectively, and is used to increase the preset make-up air volume of the first make-up port according to the risk distance and the preset make-up air adjustment coefficient to obtain a number of the adjusted make-up air volumes, wherein H1=H×[1+b×(S / S0)], H1 is the adjusted make-up air volume, H is the preset make-up air volume, b is the preset make-up air adjustment coefficient, S is the risk distance, and S0 is the reference distance;

[0131] The second make-up air volume adjustment unit is connected to the make-up port determination unit and the adjustment distance calculation unit respectively. It is used to increase the preset make-up air volume of the second make-up port by the pollution distance and the preset make-up air adjustment coefficient to obtain a number of the adjusted make-up air volumes, where H2=H×[1+b×(N / S0)], H2 is the adjusted make-up air volume, H is the preset make-up air volume, b is the preset make-up air adjustment coefficient, N is the pollution distance, and S0 is the reference distance;

[0132] A general air supply adjustment unit is connected to the first air supply adjustment unit and the second air supply adjustment unit respectively. It is used to calculate the sum of the differences between the adjusted air supply volume and the preset air supply volume of each of the first and second air supply ports to obtain the air supply volume change. The air supply volume change is then evenly distributed to all general air supply ports to obtain the general air supply volume. The preset air supply volume of each general air supply port is reduced according to the general air supply volume to obtain several adjusted air supply volumes. Here, H3 = H - H', H3 is the adjusted air supply volume, H is the preset air supply volume, and H' is the general air supply volume.

[0133] Wherein, the channel endpoint is the endpoint of the airflow channel other than the risk outlet, and the general replenishment port is the replenishment port other than the first replenishment port and the second replenishment port among all the replenishment ports.

[0134] The S0 reference distance (S0) is a baseline value used to normalize the risk distance S. It depends on the maximum risk distance in the specific application scenario, design specifications, or experimental data, and is usually set between 1 meter and 5 meters. In this embodiment, it is set to 2 meters, which can effectively normalize the risk distance, making the adjusted make-up air volume calculation more reasonable, while avoiding excessive increase in make-up air volume due to an excessively large risk distance.

[0135] The preset make-up air adjustment coefficient is a coefficient used to adjust the make-up air volume based on the risk distance or contamination distance. It reflects the relationship between distance and make-up air volume and depends on the laboratory's ventilation system design, the complexity of the experimental operation, and the requirements for ventilation effect and energy utilization efficiency. It is usually set between 0.1 and 0.5. In this embodiment, it is set to 0.3 to ensure that when the risk distance or contamination distance is far, the make-up air volume can be appropriately increased to effectively dilute and remove pollutants, while avoiding energy waste caused by excessive make-up air.

[0136] By accurately identifying the location coordinates of the channel endpoints and contamination points, risk-prone air supply points, including primary and secondary supply points, are precisely identified to ensure that supply air directly targets critical areas. Risk distance refers to the relative positional relationship between the channel endpoint and the risk exhaust outlet, while contamination distance refers to the relative positional relationship between the contamination point and the channel endpoint. Based on the risk and contamination distances, and combined with a preset supply air adjustment coefficient, the supply air volume at the corresponding supply air outlet is dynamically increased to achieve targeted supply air to risk and contaminated areas. By calculating the change in supply air volume and evenly distributing it to general supply outlets, the supply air distribution throughout the laboratory is optimized, avoiding localized over- or under-supply of supply air. Through precise positioning, quantitative calculation, and dynamic adjustment, refined management of the laboratory ventilation environment is achieved, ensuring the synergistic effect of supply and exhaust air and maintaining airflow balance within the laboratory.

[0137] Specifically, the patch determination unit includes:

[0138] The first replenishment port determination subunit is used to connect the risk outlet and the channel end point. Extending from the risk outlet as the origin to the channel end point, a reverse airflow ray is obtained. The replenishment port that the reverse airflow ray first meets after passing the channel end point is determined as the first replenishment port, so as to determine a number of first replenishment ports.

[0139] The second replenishment port determination subunit is used to connect the pollution point and the channel endpoint. Extending from the channel endpoint as the origin towards the pollution point, an intermediate ray is obtained. The replenishment port that the intermediate ray first encounters after passing the pollution point is determined as the second replenishment port, thereby determining a number of second replenishment ports.

[0140] By starting from both the risk outlet and the pollution point, the location of the make-up air inlet is determined using reverse airflow rays and intermediate rays. Precise positioning of the make-up air inlet ensures that the make-up air directly impacts the risk area and pollution source. The use of reverse airflow rays and intermediate rays not only considers the directionality of airflow but also optimizes the make-up air path by identifying the first point of contact, avoiding inefficient ventilation due to excessively long make-up air paths. Dynamic adjustment of the make-up air strategy ensures synergy between make-up and exhaust air, improving the efficiency and reliability of the ventilation system.

[0141] Please see Figure 4As shown, this is a logic diagram for determining the adjustment of the exhaust volume by the correction module in this embodiment. In this embodiment, the correction module includes:

[0142] The concentration reduction rate calculation unit is used to calculate the rate of change of the concentration of all pollutants within the preset correction time to obtain the concentration reduction rate;

[0143] A correction unit, connected to the concentration decrease rate calculation unit, is used to increase each of the adjusted exhaust volumes according to the relative deviation between the concentration decrease rate and the preset decrease rate threshold and a preset correction coefficient when the concentration decrease rate is less than a preset decrease rate threshold, to obtain a number of corrected exhaust volumes, where Q'=Q×[1+c×(R-R0) / R0], Q' is the corrected exhaust volume, Q is the adjusted exhaust volume, c is the preset correction coefficient, R is the concentration decrease rate, and R0 is the preset decrease rate threshold.

[0144] The preset decline rate threshold is the minimum rate at which pollutant concentration decreases to determine whether the ventilation effect meets the standard. It depends on the laboratory's safety standards, the type of pollutant, and the complexity of the experimental operation, and is typically set between 0.1 ppm / min and 0.5 ppm / min. In this embodiment, it is set to 0.3 ppm / min, which ensures ventilation effect while optimizing energy utilization and improving system operating efficiency.

[0145] The preset correction factor is a coefficient used to adjust the exhaust volume. It depends on the laboratory's ventilation system design, the type of pollutants, and the complexity of the experimental operation, and is usually set between 1.2 and 2.0. In this embodiment, the preset correction factor is set to 1.5, which ensures that when the concentration decrease rate is below the threshold, the exhaust volume can be appropriately increased, effectively improving the ventilation effect.

[0146] By monitoring the rate of change in pollutant concentration within a preset correction period in real time, the actual effectiveness of the ventilation system can be accurately assessed. When the concentration reduction rate is lower than the preset reduction rate threshold, it indicates that the current exhaust volume is insufficient to effectively reduce the pollutant concentration. Therefore, based on the deviation between the concentration reduction rate and the threshold, as well as the preset correction coefficient, the exhaust volume is dynamically increased and adjusted. This dynamic correction based on real-time data feedback ensures that the ventilation system is always in optimal operating condition, and the exhaust volume is adjusted in a timely manner to meet the actual needs of the laboratory.

[0147] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An intelligent variable air volume laboratory exhaust system, characterized by, The method comprises the following steps: a collection module is used to collect the target position in each monitoring area divided based on the position of the exhaust outlet and the pollutant concentration of each test point in each monitoring area in real time during the operation of each exhaust outlet at a preset exhaust volume and each air inlet at a preset air volume; a determination module connected with the collection module is used to determine several risk areas according to the pollutant concentration in each monitoring area; an exhaust adjustment module connected with the collection module and the determination module is used to determine several risk indexes according to the target position in each risk area and the pollutant concentration of each pollution point, and adjust the preset exhaust volume of all the exhaust outlets according to all the risk indexes to obtain several adjusted exhaust volumes; a determination module connected with the exhaust adjustment module and the collection module is used to determine several test channels according to the position of each pollution point based on each adjusted exhaust volume, and determine several airflow channels according to the target position of each test channel; an air inlet adjustment module connected with the determination module and the collection module is used to determine several risk air inlets according to the position of each pollution point and each airflow channel, and adjust the preset air volume of all the air inlets according to the position of each risk air inlet to obtain several adjusted air volumes; a correction module connected with the exhaust adjustment module and the air inlet adjustment module is used to correct each adjusted exhaust volume according to all the pollutant concentrations within a preset correction period based on all the adjusted exhaust volumes and all the adjusted air volumes to obtain several corrected exhaust volumes; the air inlet adjustment module comprises: an air inlet determination unit used to determine several risk air inlets according to the position coordinates of the channel end points and the position coordinates of the pollution points, wherein the risk air inlets comprise several first air inlets and several second air inlets; an adjustment distance calculation unit used to calculate several risk distances according to the position coordinates of the channel end points and the position coordinates of the risk air inlets, and calculate several pollution distances according to the position coordinates of the channel end points and the position coordinates of the pollution points; a first air volume adjustment unit connected with the air inlet determination unit and the adjustment distance calculation unit is used to adjust the preset air volume of the first air inlets according to the risk distances and a preset air volume adjustment coefficient to obtain several adjusted air volumes; a second air volume adjustment unit connected with the air inlet determination unit and the adjustment distance calculation unit is used to adjust the preset air volume of the second air inlets according to the pollution distances and the preset air volume adjustment coefficient to obtain several adjusted air volumes; a general air volume adjustment unit connected with the first air volume adjustment unit and the second air volume adjustment unit is used to calculate the air volume change according to the preset air volume and the adjusted air volume of each first air inlet and each second air inlet, and adjust the preset air volume of each general air inlet according to the air volume change to obtain several adjusted air volumes. The channel endpoint is an endpoint of the airflow channel other than the risk exhaust port, and the general makeup port is a makeup air port other than the first makeup port and the second makeup port among all the makeup air ports. The risk exhaust port is a corresponding exhaust port in the risk area. The preset correction time length refers to a time length for evaluating a change in a pollutant concentration.

2. The intelligent variable air volume laboratory exhaust system of claim 1, wherein, The determination module comprises: An adjacent distance calculation unit configured to calculate a plurality of adjacent distances according to positions of all adjacent pollution points in the risk area; A first endpoint determination unit connected with the adjacent distance calculation unit and configured to, when the adjacent distance is greater than a maximum value of a preset distance range, select a preset length of a point selection arc with the pollution point as a midpoint of the arc, with the risk exhaust port as a center, and with a distance from the pollution point to the risk exhaust port as a radius, and determine a plurality of to-be-measured endpoints according to all point positions adjacent to a preset first width on the point selection arc; A second endpoint determination unit connected with the adjacent distance calculation unit and configured to, when the adjacent distance is less than a minimum value of the preset distance range, combine the adjacent pollution points into a combined pollution point, select the preset length of the point selection arc with the combined pollution point as the midpoint of the arc, with the risk exhaust port as the center, and with a distance from the combined pollution point to the risk exhaust port as the radius, and determine a plurality of to-be-measured endpoints according to all point positions adjacent to the preset first width on the point selection arc; A third endpoint determination unit connected with the adjacent distance calculation unit and configured to, when the adjacent distance is within the preset distance range, connect the adjacent pollution points to obtain a point selection line segment, and determine a plurality of to-be-measured endpoints according to all point positions adjacent to the preset first width on the point selection line segment; A to-be-measured channel determination unit connected with the first endpoint determination unit, the second endpoint determination unit, and the third endpoint determination unit respectively, and configured to connect the to-be-measured endpoints and the risk exhaust port, determine a channel direction, and determine a plurality of to-be-measured channels based on a preset channel width; An airflow channel determination unit connected with the to-be-measured channel determination unit and configured to determine a plurality of airflow channels according to position coordinates of the to-be-measured endpoints and the target positions of the to-be-measured channels.

3. The intelligent variable air volume laboratory exhaust system of claim 2, wherein, The airflow channel determination unit comprises: A target quantity fluctuation calculation unit configured to count a channel target quantity in the to-be-measured channel of the preset channel width, calculate a standard deviation of the channel target quantity in a preset determination time length, and obtain a target quantity fluctuation value; A temporary channel determination subunit configured to determine a plurality of temporary channels according to a comparison result of the target quantity fluctuation value and a preset target quantity fluctuation threshold; An adjacent length calculation subunit connected with the temporary channel determination subunit and configured to calculate a plurality of adjacent lengths according to position coordinates of temporary endpoints of the temporary channels and position coordinates of the pollution points. An air flow channel determining subunit connected with the adjacent length calculating subunit, configured to compare the adjacent lengths, determine that the temporary channel corresponding to the minimum adjacent length among all the adjacent lengths is the air flow channel, and determine a plurality of air flow channels; An excluding subunit connected with the air flow channel determining subunit, configured to sort the air flow channels in descending order of length when the air flow channels are in the same direction and there is overlap, and keep only the longest air flow channel and exclude all the other air flow channels.

4. The intelligent variable air volume laboratory exhaust system of claim 3, wherein, The patch determining unit comprises: A first patch determining subunit connected with the risk exhaust port and the channel endpoint, configured to extend from the risk exhaust port to the channel endpoint to obtain an anti-air flow ray, and determine that the first patch is the first air supply port first met by the anti-air flow ray after passing through the channel endpoint, so as to determine a plurality of first patches; A second patch determining subunit connected with the pollution point and the channel endpoint, configured to extend from the channel endpoint to the pollution point to obtain an intermediate ray, and determine that the second patch is the air supply port first met by the intermediate ray after passing through the pollution point, so as to determine a plurality of second patches.

5. The intelligent variable air volume laboratory exhaust system of claim 4, wherein, The exhaust adjustment module comprises: A risk index determining unit configured to determine the risk index according to the target position, the pollutant concentration, a preset target weight, and a preset concentration weight within a preset risk determination time length; An exhaust adjusting unit connected with the risk index determining unit, configured to adjust the preset exhaust amount of the exhaust port according to the risk index to obtain a plurality of adjusted exhaust amounts.

6. The intelligent variable air volume laboratory exhaust system of claim 5, wherein, The risk index determining unit comprises: A change rate calculating subunit configured to calculate a target change rate according to the region target amount within the risk area, and calculate a concentration change rate according to the pollutant concentration within the preset risk determination time length; A risk index determining subunit connected with the change rate calculating subunit, configured to determine the risk index according to the target change rate, the concentration change rate, a preset target weight, and a preset concentration weight.

7. The intelligent variable air volume laboratory exhaust system of claim 6, wherein, The exhaust adjusting unit comprises: A risk exhaust adjusting subunit configured to adjust the preset exhaust amount of each risk exhaust port according to each risk index and a preset exhaust adjusting coefficient to obtain a plurality of adjusted exhaust amounts; An exhaust change amount calculating subunit connected with the risk exhaust adjusting subunit, configured to calculate an exhaust change amount according to the preset exhaust amount and the adjusted exhaust amount of each risk exhaust port; A general exhaust adjusting subunit connected with the exhaust change amount calculating subunit, configured to adjust the preset exhaust amount of each general exhaust port according to the exhaust change amount to obtain a plurality of adjusted exhaust amounts; The general exhaust port is an exhaust port other than the risk exhaust port among all the exhaust ports.

8. The intelligent variable air volume laboratory exhaust system of claim 7, wherein, The determination module comprises: A pollution point determining unit configured to determine a plurality of pollution points according to a comparison result of the pollutant concentration and a preset concentration threshold. A risk determining unit is connected with the pollution point determining unit, and is configured to determine a plurality of risk areas according to a comparison result of the number of the pollution points in each of the monitoring areas and a preset number threshold.

9. The intelligent variable air volume laboratory exhaust system of claim 8, wherein, The correction module comprises: A concentration drop rate calculating unit is configured to determine a concentration drop rate according to all the pollution concentrations in the preset correction time length; A correction unit is connected with the concentration drop rate calculating unit, and is configured to correct each of the adjusted exhaust air volumes according to a comparison result of the concentration drop rate and a preset drop rate threshold, so as to obtain a plurality of corrected exhaust air volumes.

Images