Intelligent variable air volume laboratory exhaust system

Abstract

The invention relates to the technical field of laboratory ventilation, in particular to an intelligent variable air volume laboratory exhaust system which comprises a collection module, a judgment module, an exhaust adjustment module, a determination module, an air supplement adjustment module and a correction module. The target position and the pollutant concentration are monitored in real time, the risk area is judged based on the pollutant concentration, the risk index is calculated in combination with the target position in the risk area, the exhaust air rate is adjusted accordingly, the airflow channel is determined according to the adjusted exhaust air rate and the pollution point position, airflow distribution is optimized, and the air supplement amount is adjusted in combination with the pollution point position. The exhaust air rate is corrected according to the change of the pollutant concentration, so that the long-term stable operation of the system is ensured; the problems that due to the fixed air volume and dependence on a single signal, complex and changeable experiment scenes are difficult to adapt, the response speed to emergencies is low, and consequently air exhaust lags behind, and laboratory pollutants are accumulated are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory ventilation, and in particular to an intelligent variable air volume laboratory exhaust system. Background Art

[0002] As laboratories continue to expand and experiments become more complex, ventilation and exhaust requirements within them are also becoming increasingly diverse. Traditional fixed-volume exhaust systems often struggle to meet the precise ventilation requirements for different experimental scenarios, easily leading to problems such as pollutant accumulation and energy waste within the laboratory. Especially in the face of sudden pollutant outbreaks or leaks, traditional systems struggle to effectively control the spread of pollutants, respond promptly, and quickly adjust the exhaust system. Therefore, intelligent systems that can dynamically adjust exhaust and makeup air volumes based on pollutant concentrations to achieve variable air volume exhaust are particularly important.

[0003] Chinese patent application publication number: CN119063117A, discloses a laboratory ventilation and exhaust variable air volume control system, including a control module, a signal module, and a coordination and corresponding module. The coordination and corresponding module is connected to the signal module and the control module. The signal module quickly inputs a pressure difference preset signal and a static working voltage reference signal to the coordination and corresponding module, and also inputs an exhaust fixed amount or supply fixed amount signal Prot_1, and at the same time outputs a selection assistance signal corresponding to the fixed amount signal. The coordination and corresponding module detects and converts based on the input pressure difference preset signal and the fixed amount assistance signal, and outputs an exhaust adjustment amount or supply air adjustment amount signal Prot_3 that is opposite to the assistance signal and corresponds to the pressure difference preset signal to the control module. The control module controls the opening of the exhaust or supply facilities.

[0004] It can be seen that the 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 is unable to adjust the signal input in real time and flexibly according to the dynamic changes of experimental operations, resulting in its 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 and lacks comprehensive consideration of various factors within the laboratory, and cannot achieve accurate exhaust and air supply control, which is prone to insufficient or excessive exhaust, affecting the laboratory's ventilation effect and energy utilization efficiency. Summary of the Invention

[0005] To this end, the present invention provides an intelligent variable air volume laboratory exhaust system, which is used to overcome the problems in the prior art caused by fixed air volume and reliance on a single signal, such as difficulty in adapting to complex and changeable experimental scenarios and slow response to emergencies, resulting in exhaust lag and accumulation of laboratory pollutants, through multi-dimensional data analysis and dynamic adjustment mechanism.

[0006] To achieve the above objectives, the present invention provides an intelligent variable air volume laboratory exhaust system, comprising: The collection module is used to collect the pollutant concentrations of the target location in each monitoring area divided based on the location of the exhaust outlet and each test point in each monitoring area in real time when each exhaust outlet is operating at a preset exhaust volume and each supply air outlet is operating at a preset supply air volume; a determination module connected to the acquisition module, configured to determine a number of risk areas based on the pollutant concentrations in each of the monitoring areas; an exhaust adjustment module, connected to the acquisition module and the determination module, respectively, for determining a plurality of risk indices based on the target location and the pollutant concentration of each pollution point in each risk area, and adjusting the preset exhaust volumes of all the exhaust ports according to all the risk indices to obtain a plurality of adjusted exhaust volumes; a determination module, connected to the exhaust adjustment module and the acquisition module, respectively, for determining a plurality of channels to be measured according to the positions of the pollution points based on the adjusted exhaust volumes, and determining a plurality of airflow channels according to the target positions of the channels to be measured; a supply air adjustment module, connected to the determination module and the collection module, respectively, for determining a number of risk supply outlets according to the location of each of the pollution points and each of the air flow channels, and adjusting the preset supply air volumes of all of the supply air outlets in combination with the location of each of the risk outlets to obtain a number of adjusted supply air volumes; A correction module is connected to the exhaust adjustment module and the supply air adjustment module respectively, and is used to correct each adjusted exhaust volume based on all the adjusted exhaust volumes and all the adjusted supply air volumes according to all the pollutant concentrations within a preset correction time period to obtain a number of corrected exhaust volumes.

[0007] Furthermore, the determining module includes: an adjacent distance calculation unit, configured to calculate a plurality of adjacent distances according to the positions of all adjacent pollution points in the risk area; a first endpoint determination unit connected to the adjacent distance calculation unit, configured to select, when the adjacent distance is greater than a maximum value of a preset distance range, a point selection arc of a preset length with the distance from the contamination point to the risk outlet as a radius, the risk outlet as a center, and the position of the contamination point as a midpoint of the arc, and determine a plurality of endpoints to be measured based on all adjacent points of a preset first width on the point selection arc; A second endpoint determination unit, connected to the adjacent distance calculation unit, is configured to merge the adjacent contamination points when the adjacent distance is less than a minimum value of the preset distance range, record the merged contamination points as merged contamination points, select a point selection arc of the preset length with the distance from the merged contamination point to the risk outlet as the radius, the risk outlet as the center, and the position of the merged contamination point as the midpoint of the arc, and determine a plurality of endpoints to be measured based on all points on the point selection arc adjacent to the preset first width; a third endpoint determination unit connected to the adjacent distance calculation unit, configured to connect the adjacent contaminated points when the adjacent distance is within the preset distance range to obtain a selected point segment, and determine a plurality of endpoints to be measured based on all points on the selected point segment adjacent to the preset first width; a channel determination unit to be measured, connected to the first endpoint determination unit, the second endpoint determination unit, and the third endpoint determination unit, respectively, for connecting the endpoint to be measured and the risk outlet, determining a channel direction, and determining a number of channels to be measured based on a preset channel width; The airflow channel determination unit is connected to the channel determination unit to be measured, and is used to determine a plurality of the airflow channels according to the target position of each channel to be measured and the position coordinates of the end point to be measured.

[0008] Furthermore, the airflow channel determination unit includes: a target quantity fluctuation calculation unit, configured to calculate channel target quantities based on all target positions within the channel to be measured of the preset channel width, and calculate a standard deviation of the channel target quantities within a preset determined time period to obtain a target quantity fluctuation value; a temporary channel determination subunit, configured to determine a number of temporary channels based on a comparison result between the target quantity fluctuation value and a preset target quantity fluctuation threshold; an adjacent length calculation subunit, connected to the temporary channel determination subunit, for calculating a plurality of adjacent lengths based on the position coordinates of the temporary endpoints of each temporary channel and the position coordinates of each contamination point; an airflow channel determination subunit, connected to the adjacent length calculation subunit, for comparing the adjacent lengths and determining that the temporary channel corresponding to the smallest adjacent length among all adjacent lengths is the airflow channel, so as to determine a plurality of airflow channels; The exclusion subunit is connected to the airflow channel determination subunit and is used to sort the airflow channels by length from large to small when the directions of the airflow channels are the same and there is overlap, retaining only the longest airflow channel and excluding all other airflow channels.

[0009] Furthermore, the air supply adjustment module includes: a patching determining unit, configured to determine a plurality of risky patchings according to the position coordinates of the channel endpoint and the position coordinates of the contamination point, wherein the risky patchings include a plurality of first patchings and a plurality of second patchings; An adjustment distance calculation unit is used to calculate a plurality of risk distances according to the position coordinates of the channel endpoint and the position coordinates of the risk outlet, and to calculate a plurality of pollution distances according to the position coordinates of the channel endpoint and the position coordinates of the pollution point; a first supply air volume adjustment unit, connected to the patching opening determination unit and the adjustment distance calculation unit, respectively, for adjusting the preset supply air volume of the first patching opening according to the risk distance and a preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes; a second supply air volume adjustment unit, which is connected to the supply port determination unit and the adjustment distance calculation unit, respectively, and is used to adjust the preset supply air volume of the second supply port according to the contamination distance and the preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes; a general supply air adjustment unit, connected to the first supply air volume adjustment unit and the second supply air volume adjustment unit, respectively, for calculating a supply air volume change based on the preset supply air volumes and the adjusted supply air volumes of each of the first supply openings and the second supply openings, and adjusting the preset supply air volumes of each general supply opening based on the supply air volume change to obtain a plurality of adjusted supply air volumes; The channel endpoints are endpoints of the air flow channel excluding the risk outlets, and the general air supply outlets are all the air supply outlets excluding the first air supply outlet and the second air supply outlet.

[0010] Furthermore, the patching determination unit includes: a first patching port determining subunit, configured to connect the risk outlet and the channel endpoint, extend a reverse airflow ray from the risk outlet as an origin toward the channel endpoint, and determine that the first air supply port encountered by the reverse airflow ray after passing through the channel endpoint is the first patching port, thereby determining a plurality of first patching ports; The second patching port determination subunit is used to connect the contamination point and the channel endpoint, extend in the direction of the contamination point with the channel endpoint as the origin, obtain the intermediate ray, and determine that the first air supply port encountered by the intermediate ray after passing through the contamination point is the second patching port, so as to determine a plurality of second patching ports.

[0011] Furthermore, the exhaust adjustment module includes: a risk index determination unit, configured to determine the risk index according to the target location, the pollutant concentration, a preset target weight, and a preset concentration weight within a preset risk determination time period; An exhaust adjustment unit is connected to the risk index determination unit and is used to adjust the preset exhaust volume of the exhaust port according to the risk index to obtain a plurality of adjusted exhaust volumes.

[0012] Furthermore, the risk index determination unit includes: a change rate calculation subunit, configured to calculate a target change rate based on the target quantity of the area according to all target locations in the risk area, and to calculate a concentration change rate based on the target quantity of the area within the preset risk determination time period, and to calculate a concentration change rate based on all pollutant concentrations within the preset risk determination time period; A risk index determination subunit is connected to the change rate calculation subunit and is used to determine the risk index according to the target change rate, the concentration change rate, a preset target weight and a preset concentration weight.

[0013] Furthermore, the exhaust adjustment unit includes: a risk exhaust adjustment subunit, configured to adjust the preset exhaust volume of each risk exhaust port according to each risk index and a preset exhaust adjustment coefficient to obtain a plurality of adjusted exhaust volumes; an exhaust change calculation subunit, connected to the risk exhaust adjustment subunit, for calculating the exhaust volume change according to the preset exhaust volume and the adjusted exhaust volume of each risk exhaust port; a general exhaust adjustment subunit, connected to the exhaust variation calculation subunit, for adjusting the preset exhaust volume of each general exhaust port according to the exhaust volume variation to obtain a plurality of adjusted exhaust volumes; The risk exhaust outlet is the exhaust outlet corresponding to the risk area, and the general exhaust outlet is the exhaust outlet among all the exhaust outlets except the risk exhaust outlet.

[0014] Furthermore, the determination module includes: A pollution point determination unit, configured to determine a plurality of pollution points according to a comparison result between the pollutant concentration and a preset concentration threshold; The risk determination unit is connected to the pollution point determination unit and is used to determine a number of risk areas according to a comparison result between the number of pollution points in each monitoring area and a preset number threshold.

[0015] Furthermore, the correction module includes: a concentration reduction rate calculation unit, configured to determine a concentration reduction rate based on all the pollutant concentrations within the preset correction time period; The correction unit is connected to the concentration reduction rate calculation unit and is used to correct each of the adjusted exhaust volumes according to a comparison result between the concentration reduction rate and a preset reduction rate threshold to obtain a plurality of corrected exhaust volumes.

[0016] Compared with the prior art, the beneficial effect of the present invention is that, by real-time monitoring of the target position and pollutant concentration in each monitoring area, the risk area is determined based on the pollutant concentration, the risk index is calculated according to the target position and pollutant concentration in the risk area, and the exhaust volume is adjusted accordingly, and the channel to be tested and the airflow channel are determined according to the adjusted exhaust volume and the location of the pollution point, so as to optimize the airflow distribution. The supply air volume is adjusted in combination with the airflow channel and the location of the pollution point to ensure the synergistic effect of supply air and exhaust air, maintain the airflow balance in the laboratory, correct the exhaust volume according to the change of pollutant concentration, ensure the long-term stable operation of the system, and realize the refined management and optimized control of the laboratory ventilation environment through multi-dimensional data collection and dynamic adjustment, thereby improving energy utilization efficiency, protecting the health of experimental personnel, and ensuring the safety and comfort of the experimental environment. It effectively solves the problem of difficulty in adapting to complex and changing experimental scenes and slow response to emergencies due to fixed air volume and reliance on a single signal, resulting in exhaust lag and accumulation of laboratory pollutants.

[0017] Furthermore, through tiered screening, specific contamination points are precisely identified based on a comparison of pollutant concentrations against preset concentration thresholds. This ensures that only those pollutant concentrations that pose a threat to human health or laboratory safety are marked as contaminated. Subsequently, by comparing the number of contamination points within each monitoring area against a preset threshold, risk areas are further determined. From point to area, this approach not only accurately locates the source of pollution but also effectively assesses the degree of pollution risk across the entire monitoring area.

[0018] Furthermore, by comprehensively considering the target location, pollutant concentration, and corresponding preset weights within the preset risk determination timeframe, a risk index is calculated, fully reflecting the impact of various factors on ventilation demand and ensuring the scientific and rationality of exhaust adjustments. Subsequently, the preset exhaust volume of the exhaust vent 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 effects, improving energy efficiency, and ensuring a safe and comfortable laboratory environment.

[0019] 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 just static numerical levels. Subsequently, the target change rate and concentration change rate are weighted and summed with the preset weights to obtain a risk index. This fully considers the importance of different factors to the risk, ensuring the scientific nature and flexibility of risk assessment. Through dynamic monitoring and weighted assessment, the system can more accurately identify and quantify the risk level within the laboratory, thereby providing a more accurate basis for subsequent exhaust adjustments, realizing intelligent and refined management of the ventilation system, and effectively ensuring the safety and comfort of the laboratory environment.

[0020] Furthermore, by increasing the exhaust volume of the risk outlet according to the risk index and the preset exhaust adjustment coefficient, it is ensured that the pollutants in the risk area can be quickly discharged, thereby effectively reducing the concentration of pollutants in the risk area. Subsequently, the change in exhaust volume is calculated, providing the system with a quantitative basis for overall exhaust adjustment. The change in exhaust volume is evenly distributed to the general outlets, and the preset exhaust volume is reduced accordingly to balance the ventilation system of the entire laboratory, avoiding insufficient ventilation or energy waste in other areas due to the increase in local exhaust volume. By dynamically adjusting the exhaust volume in the risk area and reasonably allocating the exhaust volume of the general outlets, 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.

[0021] Furthermore, by classifying the distances between pollution points, different methods are used to determine the endpoints to be measured according to different distance conditions. When the adjacent distance is too large, the endpoints to be measured are determined by selecting circular arcs to ensure effective monitoring of isolated pollution points. When the adjacent distance is too small, the pollution points are merged before determining the endpoints to be measured to avoid repeated monitoring due to overly dense pollution points. When the adjacent distance is in the intermediate range, the endpoints to be measured are determined by selecting line segments, taking into account the comprehensiveness and efficiency of monitoring. The layout of the airflow channel is further optimized based on the endpoints to be measured and the target location. 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 spread of pollutants in different scenarios.

[0022] Furthermore, by calculating the target quantity fluctuation value and comparing it with the preset target quantity fluctuation threshold, potential airflow channels are screened out. When the target quantity fluctuation value is low, it means that the change in the number of people in the channel is small and relatively stable, and it is regarded as a temporary channel. Subsequently, the distance between the temporary channel endpoint and the pollution point is calculated to provide data support for subsequent channel optimization. By comparing these distances, the temporary endpoint corresponding to the best adjacent length is selected as the channel endpoint to determine the final airflow channel. Distance-based optimization can ensure the effectiveness and rationality of the airflow channel. Finally, the lengths of airflow channels with the same direction and overlap are compared and corrected to exclude shorter channels, further optimize the layout of the airflow channel, and avoid waste of resources and low ventilation efficiency.

[0023] Furthermore, the position coordinates of the channel endpoints and the contamination points are used to accurately identify risky outlets, including the first outlet and the second outlet, to ensure that the supply air can directly act on key areas. The risk distance refers to the relative positional relationship between the channel endpoint and the risk outlet, and the contamination distance refers to the relative positional relationship between the contamination point and the channel endpoint. According to the risk distance and the contamination distance, combined with the preset supply air adjustment coefficient, the supply air volume of the corresponding supply air outlet is dynamically increased to achieve targeted supply air to risk areas and contaminated areas. By calculating the change in supply air volume and evenly distributing it to general outlets, the supply air distribution of the entire laboratory is optimized to avoid excessive or insufficient local supply air. Through precise positioning, quantitative calculation and dynamic adjustment, the laboratory ventilation environment is managed in a refined manner, ensuring the synergistic effect of supply air and exhaust air, and maintaining the airflow balance in the laboratory.

[0024] Furthermore, by using counterflow rays and intermediate rays, starting from the risk outlets and contamination points, respectively, the location of the supply air outlets is determined. This allows for precise positioning of the supply air outlets, ensuring that the supply air reaches the risk areas and pollution sources directly. The use of counterflow rays and intermediate rays not only considers the directionality of the airflow but also optimizes the supply air path by first encountering the supply air outlet, avoiding inefficient ventilation caused by excessively long supply air paths. Dynamically adjusting the supply air strategy ensures synergistic effects between supply and exhaust air, improving the efficiency and reliability of the ventilation system.

[0025] Furthermore, by real-time monitoring of the rate of change in pollutant concentration over a preset correction period, the ventilation system's actual effectiveness can be accurately assessed. When the concentration drop rate falls below a preset threshold, it indicates that the current exhaust volume is insufficient to effectively reduce pollutant concentration. Based on the deviation between the concentration drop rate and the threshold and a preset correction factor, the exhaust volume is dynamically increased and adjusted. This dynamic correction based on real-time data feedback ensures the ventilation system is always operating optimally, allowing for timely adjustments to the exhaust volume to meet the laboratory's actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the intelligent variable air volume laboratory exhaust system described in this embodiment; Figure 2 This is a logic diagram for determining risk areas by the determination module in this embodiment; Figure 3 This is a decision logic diagram for determining a temporary channel by the airflow channel determination unit of this embodiment; Figure 4 This is the decision logic diagram for the correction module to adjust the exhaust volume in this embodiment. DETAILED DESCRIPTION

[0027] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] See also Figure 1 As shown, it is a schematic diagram of the intelligent variable air volume laboratory exhaust system according to this embodiment. This embodiment provides an intelligent variable air volume laboratory exhaust system, including: The collection module is used to collect the pollutant concentrations of the target location in each monitoring area divided based on the location of the exhaust outlet and each test point in each monitoring area in real time when each exhaust outlet is operating at a preset exhaust volume and each supply air outlet is operating at a preset supply air volume; a determination module connected to the acquisition module, configured to determine a number of risk areas based on the pollutant concentrations in each of the monitoring areas; an exhaust adjustment module, connected to the acquisition module and the determination module, respectively, for determining a plurality of risk indices based on the target location and the pollutant concentration of each pollution point in each risk area, and adjusting the preset exhaust volumes of all the exhaust ports according to all the risk indices to obtain a plurality of adjusted exhaust volumes; a determination module, connected to the exhaust adjustment module and the acquisition module, respectively, for determining a plurality of channels to be measured according to the positions of the pollution points based on the adjusted exhaust volumes, and determining a plurality of airflow channels according to the target positions of the channels to be measured; a supply air adjustment module, connected to the determination module and the collection module, respectively, for determining a number of risk supply outlets according to the location of each of the pollution points and each of the air flow channels, and adjusting the preset supply air volumes of all of the supply air outlets in combination with the location of each of the risk outlets to obtain a number of adjusted supply air volumes; A correction module is connected to the exhaust adjustment module and the supply air adjustment module respectively, and is used to correct each adjusted exhaust volume based on all the adjusted exhaust volumes and all the adjusted supply air volumes according to all the pollutant concentrations within a preset correction time period to obtain a number of corrected exhaust volumes.

[0030] In this example, sudden contaminant leaks are a common risk in laboratory environments. For example, during a chemical experiment, improper operation or equipment failure may lead to the leakage of hazardous 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.

[0031] In this embodiment, the exhaust system in the laboratory divides the entire laboratory into multiple monitoring areas according to the location of the exhaust outlet. Each monitoring area corresponds to an exhaust outlet, and the exhaust outlet is located in the center of the monitoring area. Several supply air outlets are evenly distributed in the laboratory, and each monitoring area has several supply air outlets. Initially, each exhaust outlet of the exhaust system operates at a preset exhaust volume and each supply air outlet operates at a preset supply air volume. The total exhaust volume and the total supply air volume maintain the initial internal and external pressure difference. During the intelligent variable air volume exhaust process, the total exhaust volume, the total supply air volume and the internal and external pressure difference remain unchanged. The experimental point to be tested refers to the location where the experiment will be carried out in the monitoring area. Pollutants may erupt during the experiment, threatening the life safety of the experimenter.

[0032] In this embodiment, the volume of the monitoring area is 60m 3 The preset exhaust volume refers to the low-power exhaust flow rate of the laboratory exhaust system in a safe environment. It depends on the laboratory area, height, experiment type, equipment layout and safety standards. It is usually set at 360m 3 / h to 720m 3 / h. In this embodiment, it is set to 600m 3 / h, which can effectively maintain the air quality in the laboratory with the lowest power while avoiding energy waste caused by excessive exhaust.

[0033] In this embodiment, 8 air supply ports are evenly distributed in each monitoring area. The preset air supply volume refers to the low-power air supply flow rate of the laboratory exhaust system in a safe environment. It depends on the laboratory's exhaust volume, room pressure balance requirements, and ventilation system design. It is usually set at 60m 3 / h to 75m 3 / h. In this embodiment, it is set to 67m 3 / h to effectively maintain the negative pressure in the laboratory, prevent pollutants from spilling out, and ensure indoor air circulation.

[0034] In this example, the target location refers to the location of the experimenter. A camera captures real-time images of the laboratory, and computer vision techniques (such as deep learning algorithms) are used to identify the experimenter's location. Pollutant concentration refers to the pollutant content at the laboratory's experimental points. This information is related to whether the air quality in the laboratory meets safety standards. It is collected by gas sensors installed at each experimental point.

[0035] The preset correction time is the length of time used to evaluate changes in pollutant concentrations. It depends on the laboratory's ventilation system response speed, the complexity of the experimental operations, and the expected ventilation effect. It is typically set between 30 seconds and 5 minutes. In this example, it is set to 2 minutes to ensure that the system has sufficient time to evaluate changes in pollutant concentrations while avoiding excessive waiting times, ensuring rapid response and efficient operation of the ventilation system.

[0036] By real-time monitoring of the target location and pollutant concentration in each monitoring area, the risk area is determined based on the pollutant concentration, and the risk index is calculated based on the target location and pollutant concentration in the risk area. The exhaust volume is adjusted accordingly, and the channel to be tested and the airflow channel are determined based on the adjusted exhaust volume and the location of the pollution point to optimize the airflow distribution. The makeup air volume is adjusted in combination with the airflow channel and the location of the pollution point to ensure the synergy between makeup air and exhaust air, maintain the airflow balance in the laboratory, and correct the exhaust volume according to the changes in pollutant concentration to ensure the long-term stable operation of the system. Through multi-dimensional data collection and dynamic adjustment, the laboratory ventilation environment is managed and optimized, thereby improving energy efficiency, protecting the health of experimental personnel, and ensuring the safety and comfort of the experimental environment. It effectively solves the problems of difficulty in adapting to complex and changing experimental scenarios and slow response to emergencies due to fixed air volume and reliance on a single signal, resulting in exhaust lag and accumulation of laboratory pollutants.

[0037] See also Figure 2 As shown, it is a determination logic diagram of the determination module of this embodiment for determining the risk area. In this embodiment, the determination module includes: a pollution point determination unit, configured to determine that the test point to be tested is the pollution point when the pollutant concentration is greater than a preset concentration threshold, so as to determine a plurality of pollution points; The risk determination unit is connected to the pollution point determination unit and 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, so as to determine a plurality of risk areas.

[0038] The preset concentration threshold is the upper limit of pollutant concentration used to determine whether the experimental point under test is a contaminated point. It depends on the types of pollutants that may be generated in the laboratory, the safety standards of experimental operations, and the requirements for protecting personnel health. It is usually set between 10ppm and 50ppm. In this embodiment, it is set to 30ppm, which can effectively identify potential contamination risks while ensuring the health of experimental personnel and ensuring a safe laboratory environment.

[0039] The preset number threshold is the upper limit of the number of contamination points used to determine whether an area is a risk zone. It depends on the laboratory layout, the complexity of the experimental operation, and the requirements for ventilation safety. It is usually set between 1 and 5 contamination points. In this embodiment, it is set to 2 contamination points to accurately identify risk areas and optimize system operation efficiency.

[0040] Through tiered screening, specific contamination points are first accurately identified based on a comparison of pollutant concentrations against preset concentration thresholds. This ensures that only those pollutant concentrations that reach levels that could pose a threat to human health or laboratory safety are marked as contaminated. Subsequently, by comparing the number of contamination points within each monitoring area against a preset threshold, risk areas are further determined. From point to area, this approach not only accurately locates the source of pollution but also effectively assesses the degree of pollution risk across the entire monitoring area.

[0041] Specifically, the exhaust adjustment module includes: a risk index determination unit, configured to determine the risk index according to the target location, the pollutant concentration, a preset target weight, and a preset concentration weight within a preset risk determination time period; An exhaust adjustment unit is connected to the risk index determination unit and is used to adjust the preset exhaust volume of the exhaust port according to the risk index to obtain a plurality of adjusted exhaust volumes.

[0042] By comprehensively considering the target location, pollutant concentration, and corresponding preset weights within the preset risk determination timeframe, a risk index is calculated, fully reflecting the impact of each factor on ventilation demand and ensuring the scientific and rationality of exhaust adjustments. Subsequently, the preset exhaust volume of the exhaust vent 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 effects, improving energy efficiency, and ensuring a safe and comfortable laboratory environment.

[0043] Specifically, the risk index determination unit includes: a change rate calculation subunit, configured to calculate the regional target quantity based on all the target locations in the risk area, and calculate the change rate of all the regional target quantities within the preset risk determination time to obtain a target change rate, and calculate the change rate of all the pollutant concentrations within the preset risk determination time to obtain a concentration change rate; The risk index determination subunit is connected to the change rate calculation subunit and is used to perform weighted summation on the target change rate, the concentration change rate, the preset target weight and the preset concentration weight to obtain the risk index.

[0044] 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 laboratory safety and personnel health. It is usually set between 0.3 and 0.7. In this example, it is set to 0.5 to balance the contribution of changes in the target quantity and changes in pollutant concentration to risk, ensuring a more comprehensive and accurate risk assessment.

[0045] 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 laboratory safety and personnel health. It is usually set between 0.3 and 0.7. In this example, it is set to 0.5 to balance the contribution of concentration changes and target quantity changes to risk, ensuring a more comprehensive and accurate risk assessment.

[0046] 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 the preset weights to obtain a risk index. This fully considers the importance of different factors to the risk, ensuring the scientific nature and flexibility of risk assessment. Through dynamic monitoring and weighted assessment, the system can more accurately identify and quantify the risk level within the laboratory, thereby providing a more accurate basis for subsequent exhaust adjustments, realizing intelligent and refined management of the ventilation system, and effectively ensuring the safety and comfort of the laboratory environment.

[0047] Specifically, the exhaust adjustment unit includes: a risk exhaust adjustment subunit, configured to increase the preset exhaust volume of each risk exhaust port according to each risk index and a preset exhaust adjustment coefficient to obtain a plurality of adjusted exhaust volumes, wherein 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); an exhaust change calculation subunit, connected to the risk exhaust adjustment subunit, for calculating the difference between the adjusted exhaust volume and the preset exhaust volume of each risk exhaust port to obtain a plurality of exhaust increases, and calculating the sum of all exhaust increases to obtain an exhaust volume change; a general exhaust adjustment subunit, connected to the exhaust variation calculation subunit, for evenly distributing the exhaust variation to all general exhaust ports to obtain a general exhaust volume, and reducing the preset exhaust volume of each general exhaust port according to the general exhaust volume to obtain a plurality of 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; The risk exhaust outlet is the exhaust outlet corresponding to the risk area, and the general exhaust outlet is the exhaust outlet among all the exhaust outlets except the risk exhaust outlet.

[0048] The preset exhaust adjustment factor is a factor used to dynamically increase exhaust volume based on the risk index. It depends on the laboratory's ventilation system design, the complexity of the experimental operations, and the requirements for pollutant control, and is typically set between 1.2 and 2.0. In this example, it is set to 1.5, which ensures that the exhaust volume within the risk area is sufficient to quickly reduce pollutant concentrations while avoiding energy waste caused by excessive exhaust.

[0049] By increasing the exhaust volume of the risk outlets according to the risk index and the preset exhaust adjustment coefficient, it is ensured that pollutants in the risk area can be quickly discharged, thereby effectively reducing the concentration of pollutants in the risk area. Subsequently, the change in exhaust volume is calculated, providing the system with a quantitative basis for overall exhaust adjustment. The change in exhaust volume is evenly distributed to the general outlets, and their preset exhaust volume is reduced accordingly to balance the ventilation system of the entire laboratory, avoiding insufficient ventilation or energy waste in other areas due to increased local exhaust volume. By dynamically adjusting the exhaust volume in the risk area and reasonably allocating the exhaust volume of the general outlets, 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.

[0050] Specifically, the determination module includes: an adjacent distance calculation unit, configured to calculate the Euclidean distances of adjacent pollution points in the risk area to obtain a plurality of adjacent distances; a first endpoint determination unit connected to the adjacent distance calculation unit, configured to select, when the adjacent distance is greater than a maximum value of a preset distance range, a point selection arc of a preset length with the distance from the contamination point to the risk outlet as a radius, the risk outlet as a center, and the position of the contamination point as a midpoint of the arc, and determine a plurality of endpoints to be measured based on all adjacent points of a preset first width on the point selection arc; A second endpoint determination unit, connected to the adjacent distance calculation unit, is configured to merge the adjacent contamination points when the adjacent distance is less than a minimum value of the preset distance range, record the merged contamination points as merged contamination points, select a point selection arc of the preset length with the distance from the merged contamination point to the risk outlet as the radius, the risk outlet as the center, and the position of the merged contamination point as the midpoint of the arc, and determine a plurality of endpoints to be measured based on all points on the point selection arc adjacent to the preset first width; a third endpoint determination unit connected to the adjacent distance calculation unit, configured to connect the adjacent contaminated points to obtain a selected point segment when the adjacent distance is greater than a minimum value of the preset distance range and less than a maximum value of the preset distance range, and determine a plurality of endpoints to be measured based on all points on the selected point segment adjacent to the preset first width; a channel determination unit to be measured, connected to the first endpoint determination unit, the second endpoint determination unit, and the third endpoint determination unit, respectively, for connecting the endpoint to be measured and the risk outlet, determining a channel direction, and determining a number of channels to be measured based on a preset channel width; The airflow channel determination unit is connected to the channel determination unit to be measured, and is used to determine a plurality of the airflow channels according to the target position of each channel to be measured and the position coordinates of the end point to be measured.

[0051] The preset distance range is used to determine the relationship between contamination points. It depends on the laboratory layout, the distribution density of contamination points, and the exhaust capacity of the ventilation system. It is usually set between [0.5m, 2m]. In this embodiment, it is set to [0.8m, 1.5m]. This can effectively distinguish the relationship between contamination points, avoid excessive merging of contamination points, and ensure the correlation between contamination points.

[0052] 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 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.

[0053] The preset first width is the distance between adjacent endpoints on the selected arc, 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 typically set between 0.1 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.

[0054] The preset channel width is the channel width used to determine the channel range. It depends on the laboratory ventilation system design and airflow distribution requirements and is typically set between 0.3 meters and 1 meter. In this embodiment, it is set to 0.5 meters to ensure sufficient space in the airflow channel, thereby improving the efficiency of the ventilation system and the uniformity of airflow distribution.

[0055] By classifying the distances between pollution points, different methods are used to determine the endpoints to be measured according to different distance conditions. When the adjacent distance is too large, the endpoints to be measured are determined by selecting circular arcs to ensure effective monitoring of isolated pollution points. When the adjacent distance is too small, the pollution points are merged before determining the endpoints to be measured to avoid repeated monitoring due to overly dense pollution points. When the adjacent distance is in the intermediate range, the endpoints to be measured are determined by selecting line segments, taking into account the comprehensiveness and efficiency of monitoring. The layout of the airflow channel is further optimized based on the endpoints to be measured and the target location. 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 spread of pollutants in different scenarios.

[0056] See also Figure 3 As shown in FIG. , it is a decision logic diagram of the airflow channel determination unit in this embodiment for determining a temporary channel. In this embodiment, the airflow channel determination unit includes: a target quantity fluctuation calculation unit, configured to calculate channel target quantities based on all target positions within the channel to be measured of the preset channel width, and calculate a standard deviation of the channel target quantities within a preset determined time period to obtain a target quantity fluctuation value; a temporary channel determination subunit, configured to determine that the channel to be measured is a temporary channel when the target quantity fluctuation value is less than a preset target quantity fluctuation threshold, and determine a number of temporary channels; an adjacent length calculation subunit, connected to the temporary channel determination subunit, for calculating the Euclidean distance between the position coordinates of the temporary endpoints of each temporary channel and the position coordinates of each pollution point to obtain a plurality of adjacent lengths; an airflow channel determination subunit, connected to the adjacent length calculation subunit, for comparing the adjacent lengths, determining the smallest adjacent length among all adjacent lengths as the optimal adjacent length, determining the temporary endpoint corresponding to the optimal adjacent length as the channel endpoint, thereby determining a plurality of channel endpoints, and determining the corresponding temporary channel as the airflow channel according to the channel endpoint, thereby determining a plurality of airflow channels; The exclusion subunit is connected to the airflow channel determination subunit and is used to sort the airflow channels by length from large to small when the directions of the airflow channels are the same and there is overlap, retaining only the longest airflow channel and excluding all other airflow channels.

[0057] The preset duration is the length of time used to collect and analyze changes in the target quantity. It depends on the dynamic characteristics of pollutant concentration changes during the experiment, the experiment type, and the system's real-time requirements. It 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.

[0058] The preset target volume fluctuation threshold is a benchmark used to determine whether target volume fluctuations are safe. It depends on the laboratory layout, the complexity of the experimental operations, 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 effectively screens out channels with small target volume fluctuations while avoiding misjudgments caused by excessively high thresholds, ensuring the safety of experimenters.

[0059] By calculating the target quantity fluctuation value and comparing it with the preset target quantity fluctuation threshold, potential airflow channels are screened out. When the target quantity fluctuation value is low, it means that the change in the number of people in the channel is small and relatively stable, and it is regarded as a temporary channel. Subsequently, the distance between the temporary channel endpoint and the pollution point is calculated to provide data support for subsequent channel optimization. By comparing these distances, the temporary endpoint corresponding to the best adjacent length is selected as the channel endpoint to determine the final airflow channel. Distance-based optimization can ensure the effectiveness and rationality of the airflow channel. Finally, the lengths of airflow channels with the same direction and overlap are compared and corrected to exclude shorter channels, further optimize the layout of the airflow channel, and avoid waste of resources and low ventilation efficiency.

[0060] Specifically, the air supply adjustment module includes: a patching determining unit, configured to determine a plurality of risky patchings according to the position coordinates of the channel endpoint and the position coordinates of the contamination point, wherein the risky patchings include a plurality of first patchings and a plurality of second patchings; Adjusting the distance calculation unit to calculate the Euclidean distance between the position coordinates of the channel endpoint and the position coordinates of the risk outlet to obtain a plurality of risk distances, and to calculate the Euclidean distance between the position coordinates of the channel endpoint and the position coordinates of the contamination point to obtain a plurality of contamination distances; a first supply air volume adjustment unit, connected to the patch determining unit and the adjustment distance calculating unit, respectively, for increasing the preset supply air volume of the first patch according to the risk distance and a preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes, wherein H1=H×[1+b×(S / S0)], H1 is the adjusted supply air volume, H is the preset supply air volume, b is the preset supply air adjustment coefficient, S is the risk distance, and S0 is the reference distance; a second supply air volume adjustment unit, connected to the supply port determination unit and the adjustment distance calculation unit, respectively, for increasing the preset supply air volume of the second supply port by the contaminated distance and the preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes, wherein H2=H×[1+b×(N / S0)], H2 is the adjusted supply air volume, H is the preset supply air volume, b is the preset supply air adjustment coefficient, N is the contaminated distance, and S0 is the reference distance; a general supply air adjustment unit, which is connected to the first supply air volume adjustment unit and the second supply air volume adjustment unit, respectively, and is used to calculate the sum of the differences between the adjusted supply air volume and the preset supply air volume of each of the first and second supply ports to obtain a supply air volume change, and evenly distribute the supply air volume change to all general supply ports to obtain a general supply air volume, and reduce the preset supply air volume of each general supply port according to the general supply air volume to obtain a number of adjusted supply air volumes, wherein H3=H-H', H3 is the adjusted supply air volume, H is the preset supply air volume, and H' is the general supply air volume; The channel endpoints are endpoints of the air flow channel excluding the risk outlets, and the general air supply outlets are all the air supply outlets excluding the first air supply outlet and the second air supply outlet.

[0061] 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 typically set between 1 and 5 meters. In this embodiment, it is set to 2 meters to effectively normalize the risk distance, making the adjusted supply air volume calculation more reasonable while avoiding excessive increases in supply air volume due to excessive risk distances.

[0062] The preset supply air adjustment factor is used to adjust the supply air volume based on the risk distance or contamination distance. It reflects the relationship between distance and supply air volume and depends on the laboratory's ventilation system design, the complexity of experimental operations, and the requirements for ventilation effectiveness and energy efficiency. It is typically set between 0.1 and 0.5. In this embodiment, it is set to 0.3 to ensure that the supply air volume can be appropriately increased when the risk distance or contamination distance is long, effectively diluting and discharging pollutants while avoiding energy waste caused by excessive supply air.

[0063] Through the position coordinates of the channel endpoints and the contamination points, the risk ports, including the first and second ports, are accurately identified to ensure that the supply air can directly act on the key areas. The risk distance refers to the relative position relationship between the channel endpoint and the risk outlet, and the contamination distance refers to the relative position relationship between the contamination point and the channel endpoint. According to the risk distance and the contamination distance, combined with the preset supply air adjustment coefficient, the supply air volume of the corresponding supply air port is dynamically increased to achieve targeted supply air to the risk area and the contaminated area. By calculating the change in the supply air volume and evenly distributing it to the general ports, the supply air distribution of the entire laboratory is optimized to avoid excessive or insufficient local supply air. Through precise positioning, quantitative calculation and dynamic adjustment, the laboratory ventilation environment is managed in a refined manner, ensuring the synergistic effect of supply air and exhaust air, and maintaining the airflow balance in the laboratory.

[0064] Specifically, the patching determination unit includes: a first patching port determining subunit, configured to connect the risk outlet and the channel endpoint, extend a reverse airflow ray from the risk outlet as an origin toward the channel endpoint, and determine that the first air supply port encountered by the reverse airflow ray after passing through the channel endpoint is the first patching port, thereby determining a plurality of first patching ports; The second patching port determination subunit is used to connect the contamination point and the channel endpoint, extend in the direction of the contamination point with the channel endpoint as the origin, obtain the intermediate ray, and determine that the first air supply port encountered by the intermediate ray after passing through the contamination point is the second patching port, so as to determine a plurality of second patching ports.

[0065] Starting from the risk outlets and contamination points, respectively, the supply air outlets are located using counterflow rays and intermediate rays. This allows for precise positioning of the supply air outlets, ensuring that the supply air reaches the risk areas and pollution sources directly. The use of counterflow rays and intermediate rays not only considers the directionality of airflow but also optimizes the supply air path by first encountering the supply air outlet. This avoids inefficient ventilation caused by excessively long supply air paths, dynamically adjusts the supply air strategy, ensures synergy between supply and exhaust air, and improves the efficiency and reliability of the ventilation system.

[0066] See also Figure 4 As shown, it is a decision logic diagram of the correction module of this embodiment to correct and adjust the exhaust volume. In this embodiment, the correction module includes: a concentration decrease rate calculation unit, configured to calculate the change rate of all the pollutant concentrations within the preset correction time period to obtain a concentration decrease rate; A correction unit is connected to the concentration decrease rate calculation unit and 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 the preset decrease rate threshold, so as to obtain a plurality of corrected exhaust volumes, wherein 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.

[0067] The preset drop rate threshold is the minimum rate of decrease in pollutant concentration used to determine whether ventilation effectiveness meets standards. It depends on the laboratory's safety standards, the type of pollutant, and the complexity of the experimental operation, and is typically set between 0.1ppm / min and 0.5ppm / min. In this embodiment, it is set to 0.3ppm / min, which ensures ventilation effectiveness while optimizing energy utilization and improving system operating efficiency.

[0068] The preset correction factor is used to adjust the exhaust volume. It depends on the laboratory's ventilation system design, the type of pollutant, and the complexity of the experimental operation, and is typically set between 1.2 and 2.0. In this embodiment, the preset correction factor is set to 1.5, which ensures that the exhaust volume can be appropriately increased when the concentration drop rate falls below the threshold, effectively improving ventilation efficiency.

[0069] By monitoring the rate of change of pollutant concentrations over a preset correction period in real time, the ventilation system's effectiveness can be accurately assessed. When the concentration drop rate falls below a preset threshold, it indicates that the current exhaust volume is insufficient to effectively reduce pollutant concentrations. Based on the deviation between the concentration drop rate and the threshold and the preset correction factor, the exhaust volume is dynamically increased and adjusted. Dynamic corrections based on real-time data feedback ensure the ventilation system is always operating optimally, allowing timely adjustments to meet the laboratory's actual needs.

[0070] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An intelligent variable air volume laboratory exhaust system, characterized in that: include: The collection module is used to collect the pollutant concentrations of the target location in each monitoring area divided based on the location of the exhaust outlet and each test point in each monitoring area in real time when each exhaust outlet is operating at a preset exhaust volume and each supply air outlet is operating at a preset supply air volume; a determination module connected to the acquisition module, configured to determine a number of risk areas based on the pollutant concentrations in each of the monitoring areas; an exhaust adjustment module, connected to the acquisition module and the determination module, respectively, for determining a plurality of risk indices based on the pollutant concentrations at the target locations and pollution points within each risk area, and adjusting the preset exhaust volumes of all the exhaust ports based on all the risk indices to obtain a plurality of adjusted exhaust volumes; a determination module, connected to the exhaust adjustment module and the acquisition module, respectively, for determining a plurality of channels to be measured according to the positions of the pollution points based on the adjusted exhaust volumes, and determining a plurality of airflow channels according to the target positions of the channels to be measured; a supply air adjustment module, connected to the determination module and the collection module, respectively, for determining a number of risk supply outlets according to the location of each of the pollution points and each of the air flow channels, and adjusting the preset supply air volumes of all of the supply air outlets in combination with the location of each of the risk outlets to obtain a number of adjusted supply air volumes; A correction module is connected to the exhaust adjustment module and the supply air adjustment module respectively, and is used to correct each adjusted exhaust volume based on all the adjusted exhaust volumes and all the adjusted supply air volumes according to all the pollutant concentrations within a preset correction time period to obtain a number of corrected exhaust volumes.

2. The intelligent variable air volume laboratory exhaust system according to claim 1 is characterized in that: The determination module includes: an adjacent distance calculation unit, configured to calculate a plurality of adjacent distances according to the positions of all adjacent pollution points in the risk area; a first endpoint determination unit connected to the adjacent distance calculation unit, configured to select, when the adjacent distance is greater than a maximum value of a preset distance range, a point selection arc of a preset length with the distance from the contamination point to the risk outlet as a radius, the risk outlet as a center, and the position of the contamination point as a midpoint of the arc, and determine a plurality of endpoints to be measured based on all adjacent points of a preset first width on the point selection arc; A second endpoint determination unit, connected to the adjacent distance calculation unit, is configured to merge the adjacent contamination points when the adjacent distance is less than a minimum value of the preset distance range, record the merged contamination points as merged contamination points, select a point selection arc of the preset length with the distance from the merged contamination point to the risk outlet as the radius, the risk outlet as the center, and the position of the merged contamination point as the midpoint of the arc, and determine a plurality of endpoints to be measured based on all points on the point selection arc adjacent to the preset first width; a third endpoint determination unit connected to the adjacent distance calculation unit, configured to connect the adjacent contaminated points when the adjacent distance is within the preset distance range to obtain a selected point segment, and determine a plurality of endpoints to be measured based on all points on the selected point segment adjacent to the preset first width; a channel determination unit to be measured, connected to the first endpoint determination unit, the second endpoint determination unit, and the third endpoint determination unit, respectively, for connecting the endpoint to be measured and the risk outlet, determining a channel direction, and determining a number of channels to be measured based on a preset channel width; The airflow channel determination unit is connected to the channel determination unit to be measured, and is used to determine a plurality of the airflow channels according to the target position of each channel to be measured and the position coordinates of the end point to be measured.

3. The intelligent variable air volume laboratory exhaust system according to claim 2 is characterized in that: The airflow channel determining unit includes: a target quantity fluctuation calculation unit, configured to calculate channel target quantities based on all target positions within the channel to be measured of the preset channel width, and calculate a standard deviation of the channel target quantities within a preset determined time period to obtain a target quantity fluctuation value; a temporary channel determination subunit, configured to determine a number of temporary channels based on a comparison result between the target quantity fluctuation value and a preset target quantity fluctuation threshold; an adjacent length calculation subunit, connected to the temporary channel determination subunit, for calculating a plurality of adjacent lengths based on the position coordinates of the temporary endpoints of each temporary channel and the position coordinates of each contamination point; an airflow channel determination subunit, connected to the adjacent length calculation subunit, for comparing the adjacent lengths and determining that the temporary channel corresponding to the smallest adjacent length among all adjacent lengths is the airflow channel, so as to determine a plurality of airflow channels; The exclusion subunit is connected to the airflow channel determination subunit and is used to sort the airflow channels by length from large to small when the directions of the airflow channels are the same and there is overlap, retaining only the longest airflow channel and excluding all other airflow channels.

4. The intelligent variable air volume laboratory exhaust system according to claim 3 is characterized in that: The air supply adjustment module includes: a patching determining unit, configured to determine a plurality of risky patchings according to the position coordinates of the channel endpoint and the position coordinates of the contamination point, wherein the risky patchings include a plurality of first patchings and a plurality of second patchings; An adjustment distance calculation unit is used to calculate a plurality of risk distances according to the position coordinates of the channel endpoint and the position coordinates of the risk outlet, and to calculate a plurality of pollution distances according to the position coordinates of the channel endpoint and the position coordinates of the pollution point; a first supply air volume adjustment unit, connected to the patching opening determination unit and the adjustment distance calculation unit, respectively, for adjusting the preset supply air volume of the first patching opening according to the risk distance and a preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes; a second supply air volume adjustment unit, which is connected to the supply port determination unit and the adjustment distance calculation unit, respectively, and is used to adjust the preset supply air volume of the second supply port according to the contamination distance and the preset supply air adjustment coefficient to obtain a plurality of adjusted supply air volumes; a general supply air adjustment unit, connected to the first supply air volume adjustment unit and the second supply air volume adjustment unit, respectively, for calculating a supply air volume change based on the preset supply air volumes and the adjusted supply air volumes of each of the first supply openings and the second supply openings, and adjusting the preset supply air volumes of each general supply opening based on the supply air volume change to obtain a plurality of adjusted supply air volumes; The channel endpoints are endpoints of the air flow channel excluding the risk outlets, and the general air supply outlets are all the air supply outlets excluding the first air supply outlet and the second air supply outlet.

5. The intelligent variable air volume laboratory exhaust system according to claim 4 is characterized in that: The patching determination unit includes: a first patching port determining subunit, configured to connect the risk outlet and the channel endpoint, extend a reverse airflow ray from the risk outlet as an origin toward the channel endpoint, and determine that the first air supply port encountered by the reverse airflow ray after passing through the channel endpoint is the first patching port, thereby determining a plurality of first patching ports; The second patching port determination subunit is used to connect the contamination point and the channel endpoint, extend in the direction of the contamination point with the channel endpoint as the origin, obtain the intermediate ray, and determine that the first air supply port encountered by the intermediate ray after passing through the contamination point is the second patching port, so as to determine a plurality of second patching ports.

6. The intelligent variable air volume laboratory exhaust system according to claim 5 is characterized in that: The exhaust adjustment module includes: a risk index determination unit, configured to determine the risk index according to the target location, the pollutant concentration, a preset target weight, and a preset concentration weight within a preset risk determination time period; An exhaust adjustment unit is connected to the risk index determination unit and is used to adjust the preset exhaust volume of the exhaust port according to the risk index to obtain a plurality of adjusted exhaust volumes.

7. The intelligent variable air volume laboratory exhaust system according to claim 6 is characterized in that: The risk index determination unit includes: a change rate calculation subunit, configured to calculate a target change rate based on the target quantity of the area according to all target locations in the risk area, and to calculate a concentration change rate based on the target quantity of the area within the preset risk determination time period, and to calculate a concentration change rate based on all pollutant concentrations within the preset risk determination time period; A risk index determination subunit is connected to the change rate calculation subunit and is used to determine the risk index according to the target change rate, the concentration change rate, a preset target weight and a preset concentration weight.

8. The intelligent variable air volume laboratory exhaust system according to claim 7 is characterized in that: The exhaust adjustment unit includes: a risk exhaust adjustment subunit, configured to adjust the preset exhaust volume of each risk exhaust port according to each risk index and a preset exhaust adjustment coefficient to obtain a plurality of adjusted exhaust volumes; an exhaust change calculation subunit, connected to the risk exhaust adjustment subunit, for calculating the exhaust volume change according to the preset exhaust volume and the adjusted exhaust volume of each risk exhaust port; a general exhaust adjustment subunit, connected to the exhaust variation calculation subunit, for adjusting the preset exhaust volume of each general exhaust port according to the exhaust volume variation to obtain a plurality of adjusted exhaust volumes; The risk exhaust outlet is the exhaust outlet corresponding to the risk area, and the general exhaust outlet is the exhaust outlet among all the exhaust outlets except the risk exhaust outlet.

9. The intelligent variable air volume laboratory exhaust system according to claim 8, characterized in that: The determination module includes: A pollution point determination unit, configured to determine a plurality of pollution points according to a comparison result between the pollutant concentration and a preset concentration threshold; The risk determination unit is connected to the pollution point determination unit and is used to determine a number of risk areas according to a comparison result between the number of pollution points in each monitoring area and a preset number threshold.

10. The intelligent variable air volume laboratory exhaust system according to claim 9, characterized in that: The correction module includes: a concentration reduction rate calculation unit, configured to determine a concentration reduction rate based on all the pollutant concentrations within the preset correction time period; The correction unit is connected to the concentration reduction rate calculation unit and is used to correct each of the adjusted exhaust volumes according to a comparison result between the concentration reduction rate and a preset reduction rate threshold to obtain a plurality of corrected exhaust volumes.

Images