Control method and equipment for variable air volume of fuming cupboard and medium

Abstract

The invention discloses a control method and device for variable air volume of a fuming cupboard and a medium, and relates to the technical field of general cleaning. The method comprises the following steps: collecting the current pollutant concentration generated in the fuming cupboard; according to the current pollutant concentration, an air volume control mode corresponding to the fuming cupboard is determined; obtaining experimental information of the fuming cupboard, and determining an experimental process where the fuming cupboard is located according to the experimental information and experimental operation performed in the fuming cupboard; according to the current pollutant concentration, the required air volume corresponding to the fuming cupboard is determined, according to the experimental process and the current pollutant concentration, the discharge speed corresponding to pollutants in the fuming cupboard is determined, and according to the discharge speed, the discharge duration corresponding to the required air volume is determined; based on the air volume control mode, a fan is controlled to discharge fresh air corresponding to the required air volume to the fuming cupboard within the discharge duration; and after the fresh air is discharged, the pollutant concentration in the fuming cupboard is detected again, and the needed air volume of the fuming cupboard is adjusted based on the pollutant concentration.

Description

Technical Field

[0001] The present application relates to the general field of cleaning technology, and in particular to a method, device and medium for controlling the variable air volume of a fume hood. Background Art

[0002] As a core piece of laboratory environmental control equipment, fume hoods' core function is to efficiently remove toxic and harmful gases, dust, and other pollutants generated during experiments by dynamically adjusting exhaust volume while ensuring operator safety. Traditional methods typically rely on manual termination, lacking real-time awareness of actual pollutant concentrations, potentially leading to residual pollution accumulation and unnecessary energy consumption. Summary of the Invention

[0003] In order to solve the above problems, the present application proposes a method for controlling the variable air volume of a fume hood, comprising:

[0004] A sensor disposed inside the fume hood identifies the opening height corresponding to the operating port of the fume hood and collects the current pollutant concentration generated in the fume hood when the opening height is within a preset range;

[0005] Determining an air volume control mode corresponding to the fume hood according to the current pollutant concentration;

[0006] Acquiring experimental information of the fume hood, and determining the experimental process in which the fume hood is located based on the experimental information and the experimental operation performed in the fume hood;

[0007] Determining the required air volume of the fume hood according to the current pollutant concentration, and determining the corresponding emission rate of the pollutants in the fume hood according to the experimental process and the current pollutant concentration, so as to determine the emission duration corresponding to the required air volume according to the emission rate;

[0008] Based on the air volume control mode, controlling the fan to discharge fresh air corresponding to the required air volume into the fume hood within the discharge duration;

[0009] After the fresh air is discharged, the pollutant concentration in the fume hood is re-detected, and the required air volume of the fume hood is adjusted based on the pollutant concentration.

[0010] In one implementation of the present application, determining the air volume control mode corresponding to the fume hood according to the current pollutant concentration specifically includes:

[0011] When the current pollutant concentration is greater than a preset concentration threshold, determining that the air volume control mode corresponding to the fume hood is a linkage control mode;

[0012] Otherwise, it is determined that the air volume control mode corresponding to the fume hood is the standard control mode.

[0013] In one implementation of the present application, after determining the required air volume corresponding to the fume hood according to the current pollutant concentration, the method further includes:

[0014] When the air volume control mode is the linkage control mode, the target fume hood corresponding to the branch pipe in the ventilation state is selected from the branch pipes connected to the main ventilation duct, and the wind speeds corresponding to the fume hood and the target fume hood are obtained respectively;

[0015] determining a cross-flow ratio between the fume hood and the target fume hood based on a ratio relationship between the wind speeds when the wind speed of the target fume hood is less than the wind speed of the fume hood;

[0016] Based on the cross-flow ratio and the flow distance between the target fume hood and the fume hood, a target required air volume corresponding to the target fume hood is linked and adjusted.

[0017] In one implementation of the present application, determining the cross-flow ratio between the fume hood and the target fume hood according to the ratio relationship between the wind speeds specifically includes:

[0018] The cross-flow ratio between the fume hood and the target fume hood is determined by the following formula:

[0019]

[0020] Wherein, C represents the cross-flow ratio in the flow direction from the fume hood to the target fume hood, v1 represents the wind speed of the fume hood, and v2 represents the wind speed of the target fume hood.

[0021] In one implementation of the present application, based on the cross-flow ratio and the flow distance between the target fume hood and the fume hood, the target required air volume corresponding to the target fume hood is adjusted in a linked manner, specifically including:

[0022] calculating the flow rate of pollutants from the target fume hood to the fume hood according to the cross-flow ratio;

[0023] calculating an attenuation factor of the pollutant flowing from the target fume hood to the fume hood according to the flow distance, and determining a flow contamination concentration of the pollutant flowing to the fume hood according to the attenuation factor and the flow amount;

[0024] The compensation air volume required corresponding to the flow pollution concentration is determined, and the target air volume required corresponding to the target fume hood is adjusted in a linked manner according to the compensation air volume required.

[0025] In one implementation of the present application, determining the corresponding emission rate of pollutants in the fume hood according to the experimental process and the current pollutant concentration specifically includes:

[0026] According to the experimental procedure, determining the gas release rate corresponding to each pollutant;

[0027] determining an emission adjustment factor corresponding to the fume hood based on a ratio between the gas release rate and the volume of the fume hood;

[0028] Calculating an emission change rate of the current pollutant concentration based on the required air volume, the volume, and the current pollutant concentration;

[0029] An emission rate corresponding to pollutants in the fume hood is determined based on the sum of the emission adjustment factor and the emission change rate.

[0030] In one implementation of the present application, determining the discharge duration corresponding to the required air volume according to the discharge speed specifically includes:

[0031] Acquiring working condition information corresponding to the experimental process; wherein the working condition information reflects the operation type corresponding to the current experimental process, and the operation type includes a self-reaction type and a manual operation type;

[0032] Determining a concentration reference value corresponding to the pollutant according to the operation type; wherein the concentration reference value corresponding to the human operation type is less than the concentration reference value corresponding to the self-reaction type;

[0033] The emission duration required for the pollutant to be reduced from the current pollution concentration to the concentration reference value is calculated according to the emission speed.

[0034] In one implementation of the present application, collecting the current pollutant concentration generated in the fume hood specifically includes:

[0035] Performing component analysis on the pollutants collected by each sensor to determine the concentration of each pollutant component generated in the fume hood;

[0036] Determining a pollution index factor corresponding to each pollutant component, and determining a current pollutant concentration generated in the fume hood based on the pollution index factor and the concentration of the pollutant component;

[0037] Determining the required air volume of the fume hood according to the current pollutant concentration specifically includes:

[0038] The required air volume for the corresponding pollutant component is calculated according to the concentration of the pollutant component, and the required air volume for the fume hood is calculated based on the required air volume corresponding to each pollutant component and the pollution index factor.

[0039] The present invention provides a variable air volume control device for a fume hood, comprising:

[0040] at least one processor; and,

[0041] at least one processor communicatively connected to a memory; wherein,

[0042] The memory stores instructions that can be executed by at least one processor. The instructions are executed by the at least one processor so that the at least one processor can execute the variable air volume control method of the fume hood as described in any one of the above items.

[0043] An embodiment of the present application provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as follows:

[0044] A method for controlling variable air volume of a fume hood as described in any one of the above items.

[0045] The variable air volume control method for a fume hood proposed in this application can bring the following beneficial effects:

[0046] The air volume control mode and required air volume are determined dynamically based on real-time concentration. The pollutant emission rate is analyzed and the duration of emission is calculated in combination with the experimental process. This can accurately match the ventilation needs in different experimental scenarios. It not only avoids the risk of residual pollution accumulation due to insufficient exhaust volume during high-concentration pollution, but also automatically reduces the required air volume after the pollutant concentration drops, avoiding unnecessary energy consumption caused by long-term high air volume operation under the traditional manual mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0048] Figure 1 A flow chart of a method for controlling variable air volume of a fume hood provided in an embodiment of the present application;

[0049] Figure 2 A schematic structural diagram of a variable air volume control device for a fume hood provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0052] like Figure 1 As shown, an embodiment of the present application provides a method for controlling the variable air volume of a fume hood, comprising:

[0053] S101: Identify the opening height corresponding to the operating port of the fume hood through a sensor provided inside the fume hood, and collect the current pollutant concentration generated in the fume hood when the opening height is within a preset range.

[0054] A displacement sensor is provided on the side of the fume hood operating port to detect the vertical opening height of the operating port, i.e., the glass window. When the vertical opening height is 0, that is, the operating port is in a closed state, the fume hood may be in a standby state or an isolated state. When the operating port is in an open state, the arm is allowed to go deep into the experiment. The pollutants generated during the experiment will be quickly extracted due to the stable negative pressure formed inside the fume hood. When the opening height of the operating port is within the preset range, it means that the current fume hood is in an effective operation scenario. At this time, the pollutant concentration collection process will be triggered. The electrochemical sensor, ultraviolet absorption sensor, etc. set in the fume hood for detecting pollutant concentration will be used to detect the pollutant concentration in real time. Taking the photoionization sensor for detecting volatile organic compounds (VOCs) as an example, the built-in ultraviolet lamp ionizes the VOC molecules in the air into positive and negative ions. The ions move toward the electrodes under the action of the electric field, forming a weak current. The current signal is amplified and converted to obtain the pollutant concentration value.

[0055] It should be noted that there may be multiple different types of pollutants in the fume hood at the same time, and the degree of harm and concentration of each pollutant are different. In order to accurately assess the pollution status in the fume hood, it is necessary to analyze each pollution component and determine the comprehensive current pollutant concentration.

[0056] Conduct component analysis on the pollutants collected by each sensor to determine the different sensor types and the corresponding pollutant concentrations of each pollutant generated in the fume hood. Different pollutants have different degrees of pollution due to their different properties, toxicity, volatility, etc. Therefore, for different pollutants, each pollutant has its corresponding pollution index factor. The pollution index factor is a coefficient used to measure the degree of harm of each pollutant to the environment and human health. The specific value can be set according to the actual experimental data, and this application does not limit its value. Multiply the pollutant concentration of each pollutant by its corresponding pollution index factor, and then add all the results to obtain the current pollutant concentration generated in the fume hood. The current pollutant concentration is a comprehensive concentration calculated by combining the concentrations of various types of pollutants and the corresponding impact levels, reflecting the overall pollution level in the fume hood.

[0057] S102: Determine the air volume control mode corresponding to the fume hood according to the current pollutant concentration.

[0058] With different current pollutant concentrations, the fume hood controller will trigger the fume hood to start different air volume control modes. In different air volume control modes, the ventilation control operations performed by the controller are also different.

[0059] Specifically, when the current pollutant concentration is greater than the preset concentration threshold, the pollutant concentration inside the fume hood is in an excessive state. On the one hand, it is necessary to increase the exhaust volume of the current fume hood to safely discharge all the pollutants. On the other hand, while increasing the exhaust volume, the fan frequency and speed increase, and the wind pressure decreases. The branch pipes corresponding to each fume hood in the laboratory are responsible for introducing the polluted gas in the fume hood into the main ventilation duct. The main ventilation duct is connected to each branch pipe. If there are other fume hoods in working state inside the laboratory, due to the pressure difference between the internal ventilation ducts, the pollutants generated by other fume hoods may be diffused to the current fume hood, which will undoubtedly increase the exhaust pressure of the fume hood. Therefore, when the current fume hood has a large exhaust pressure, in order to minimize the possibility of other fume hoods increasing the pollutant concentration, it is necessary to adjust the air volume control mode to the linkage control mode. In the linkage control mode, when adjusting the air volume of the fume hoods, it is necessary to consider the mutual influence of the airflow between each other to avoid cross contamination or airflow turbulence. At this time, in addition to the fume hood currently being tested, the variable air volume of other fume hoods connected to the same main ventilation duct in the laboratory needs to be adjusted in a linkage manner. When the current pollutant concentration is greater than the preset concentration threshold, the exhaust pressure of the fume hood fan is relatively stable, and the air volume control mode corresponding to the fume hood can be set to the standard control mode. In the standard control mode, there is no need to make linkage adjustments to other connected fume hoods, and only the variable air volume of the fume hood currently being tested needs to be controlled.

[0060] In one embodiment, when the fume hood is in the linkage control mode, it is necessary to screen out the target fume hood corresponding to the branch pipe in the ventilation state from the various branches connected to the main ventilation duct. Whether it is in the ventilation state can be judged by whether the branch pipe valve is open, whether the fan power supply is normal, etc. After clarifying which target fume hoods the fume hood may be affected by, it is necessary to further analyze the intensity of the airflow interaction between them, and the wind speed is the key factor in judging the flow direction and degree of pollutants. When the wind speed of the current fume hood is different from that of the target fume hood, the wind speed difference will cause the airflow in the main duct to tilt toward the branch pipe with higher wind speed, forming a cross flow. The cross flow ratio is calculated by the wind speed ratio to quantify the airflow distribution relationship between the two fume hoods.

[0061] When the wind speed of the target fume hood is lower than that of the target fume hood, the pollutants extracted from the target fume hood will be sucked back into the target fume hood due to the pressure difference, thereby increasing the pollutant concentration in the fume hood. At this time, the ratio of the wind speeds between the fume hood and the target fume hood is required to determine the cross-flow ratio between the fume hood and the target fume hood. The cross-flow ratio indicates the relative strength of the airflow interaction between the two fume hoods. The higher the cross-flow ratio, the greater the possibility of pollutant flow. The cross-flow ratio can be calculated using the following formula:

[0062]

[0063] Where C represents the crossflow ratio from the fume hood to the target fume hood, v1 represents the air velocity in the fume hood, and v2 represents the air velocity in the target fume hood. The fixed parameters in the above formula are calculated by simulating the variable air volume of the fume hood under different operating conditions.

[0064] The intensity of airflow interaction between fume hoods is also related to their flow distance on the main duct, which is calculated as the distance between the nodes where the branch ducts connect to the main duct. The closer the flow distance, the stronger the airflow interaction. Correspondingly, the fume hood is more likely to be cross-affected by pollutants, and the required air volume adjustment will be larger. Therefore, after determining the cross-flow ratio between the fume hood and the target fume hood, it is necessary to adjust the target air volume corresponding to the target fume hood in a coordinated manner based on the flow distance between the two.

[0065] In one embodiment, when multiple fume hoods are operated in conjunction with each other through the main ventilation duct, the difference in wind speed of each fume hood may cause pollutants to cross-flow between the branch pipes. In order to maintain the safe threshold of pollutant concentration of each fume hood, the required air volume needs to be dynamically adjusted according to the flow relationship of the pollutants. After the required air volume and pollutant concentration of the target fume hood are known, the total amount of pollutants generated by it can be calculated, that is, the product of the pollutant concentration and the required air volume. Then, based on the cross-flow ratio, the flow rate of pollutants from the target fume hood to the fume hood is calculated, that is, the product of the total pollution amount and the cross-flow ratio. Since pollutants will attenuate due to distance when flowing in the pipeline, only knowing the flow rate cannot determine the actual amount of pollutants that can reach the fume hood. It is necessary to further evaluate the flow pollution concentration in combination with the flow distance.

[0066] When pollutants flow through ventilation ducts, they gradually attenuate due to factors such as friction on the duct walls and air diffusion. The longer the distance, the more pronounced the attenuation. The degree of attenuation can be characterized by the attenuation factor, which is negatively correlated with the flow distance. The flow distance between the target fume hood and the current fume hood is measured, and the attenuation factor of the pollutants when they reach the fume hood is calculated based on the flow distance. The attenuation factor can be calculated using the following formula:

[0067]

[0068] Among them, v i ,v j They represent fume hood i and target fume hood j respectively, α represents the attenuation coefficient, which is determined by empirical formula or experimental data and is usually taken as 0.15 / m, L ij Indicates the flow distance.

[0069] After determining the attenuation factor, the pollutant attenuation level, i.e., the attenuated pollutant flow rate, is calculated by multiplying the attenuation factor by the flow rate. This attenuated pollutant flow rate is then converted to the corresponding flow contamination concentration by calculating the ratio of the flow rate to the current fume hood's required air volume. The flow contamination concentration represents the actual impact of the target fume hood's pollutants on the current fume hood. To eliminate this impact, the required additional air volume is calculated. By adjusting the target fume hood's required air volume, its extraction capacity is enhanced, thereby reducing the impact on other fume hoods.

[0070] Based on the flow pollution concentration and the safety concentration threshold, the target fume hood needs to calculate the additional compensation air volume required for exhaust. For example, if the flow pollution concentration causes the current concentration in the fume hood to exceed the standard by 10%, the target fume hood needs to adjust the additional compensation air volume required based on the ratio between the product of the excess concentration and the current fume hood volume and the emission rate of the target fume hood. The compensation air volume is fed back to the air volume requirement of the target fume hood. Since the target fume hood is the source of pollutant outflow, its air volume requirement is increased to reduce pollutant spillage. Through the above-mentioned linkage adjustment, it can not only ensure that the pollutants in the current fume hood are effectively controlled, but also reduce the risk of cross-contamination between multiple fume hoods, and achieve coordinated exhaust of the fume hood as a whole.

[0071] S103: Acquire experimental information of the fume hood, and determine the experimental process in which the fume hood is located based on the experimental information and the experimental operations performed in the fume hood.

[0072] The core function of a fume hood is to exhaust pollutants by controlling the airflow to ensure the safety of experimental personnel. However, the performance requirements of fume hoods for different experimental processes vary greatly, and the gas release rates corresponding to pollutants are also different. For example, no chemical reaction is carried out in the reagent preparation process. At this time, the amount of pollutants volatilized is small, and medium-speed exhaust can be used to filter out the volatile gases. The synthesis process requires the use of highly toxic gas raw materials, and the temperature will rise during the chemical reaction, which will accelerate the release rate of gas. At this time, the fume hood needs to be exhausted at high speed to ensure the safety of experimental personnel. Therefore, it is necessary to match the required experimental process according to the experimental information and experimental operation, so that the operating parameters of the fume hood can dynamically adapt to changes in the experimental process.

[0073] Before beginning an experiment, the experimenter enters experimental information such as the experiment name, reagents, main equipment, and operation type through the system interface. The controller then directly accesses this experimental information. The experimental operations involved are analyzed through characteristic parameter combinations collected by sensors installed inside the fume hood. Once the characteristic parameter combinations are extracted, they are matched with the operation feature library corresponding to the current experiment to obtain the currently executed experimental operation.

[0074] S104: Determine the required air volume of the fume hood according to the current pollutant concentration, and determine the emission rate of the pollutants in the fume hood according to the experimental process and the current pollutant concentration, so as to determine the emission duration corresponding to the required air volume according to the emission rate.

[0075] The core function of a fume hood is to control the spread of pollutants through ventilation. Therefore, it is necessary to calculate the required air volume to safely discharge pollutants based on the current pollutant concentration and industry exhaust standards. When calculating the required air volume, similar to the process of obtaining the current pollutant concentration of the fume hood, it is also necessary to add the product between the required air volume corresponding to the concentration of each pollutant component and the pollution index factor. This required air volume is set based on the real-time current pollutant concentration. During the emission process, since the pollutant release rate under different experimental procedures is also different, the emission rate of pollutants will also be different under different concentrations and experimental procedures. The emission rate will directly affect the duration of the air volume emission in each stage of the fume hood.

[0076] In one embodiment, when calculating the emission rate, the gas release rate corresponding to each pollutant is determined according to the experimental process. The gas release rate is related to the reaction process and the temperature change in the current process. The specific value can be obtained by referring to the relevant experimental records and taking the average value.

[0077] Once the gas release rates for different pollutants are determined, the corresponding emission adjustment factor for the fume hood is determined based on the ratio between the gas release rate and the volume of the fume hood. The emission adjustment factor is a coefficient used to adjust the fume hood's emissions. It comprehensively considers the relationship between the pollutant's gas release rate and the fume hood's volume, reflecting the impact of the fume hood's internal space on pollutant emissions.

[0078] The required air volume reflects the ventilation system's capacity, the fume hood volume determines the volume that can hold pollutants, and the current pollutant concentration represents the initial state. These three factors together determine the degree to which a ventilation system can alter pollutant concentration over a given period of time, known as the emission change rate. By calculating the emission change rate, we can understand the ventilation system's effectiveness in controlling pollutant concentration. Therefore, the emission change rate for the current pollutant concentration can be calculated by multiplying the product of the required air volume and the current pollutant concentration by the ratio of the volume.

[0079] The emission adjustment factor accounts for the effects of pollutant generation and fume hood volume, while the emission rate of change reflects how quickly the ventilation system changes the current pollutant concentration. Combining these two factors provides a more comprehensive estimate of the actual rate at which pollutants are discharged from the fume hood, enabling better control of pollutant concentrations within the fume hood and ensuring a safe laboratory environment. The emission rate represents the actual rate of change in pollutant concentration within the fume hood over time.

[0080] After determining the emission rate of pollutants, it is necessary to determine the duration of the fume hood's emissions at this required air volume. During this emission duration, the pollutant concentration needs to be reduced from the current concentration to the concentration baseline value.

[0081] Specifically, the working condition information corresponding to the experimental process is obtained. The working condition information reflects the operation type corresponding to the current experimental process. The operation type includes self-reaction type and manual operation type. Under different operation types, the personnel exposure risk and pollutant controllability are different. During manual operation, the experimental personnel are in a high exposure risk state and require stricter concentration control. During self-reaction operation, the experimental personnel may leave temporarily, and the set concentration baseline value can be slightly relaxed. It should be noted that the concentration baseline value is not a safety threshold, but a value used to characterize that the pollutant baseline value has been effectively discharged. When setting the concentration baseline value, it can be set according to the emission ratio of the current pollutant concentration. Under normal circumstances, the concentration baseline value in the first emission stage needs to ensure that the pollutants have been effectively discharged but have not yet been completely discharged. Under normal circumstances, the concentration baseline value is generally 50% for manual operation and 80% for self-reaction operation.

[0082] After the concentration baseline value is determined, the continuous emission time required for the pollutant concentration to be reduced from the current pollutant concentration to the concentration baseline value can be calculated based on the emission rate.

[0083] S105: Based on the air volume control mode, the fan is controlled to discharge fresh air corresponding to the required air volume to the fume hood within the discharge duration.

[0084] After calculating the continuous emission duration of the current emission stage, the controller will control the fan to emit fresh air corresponding to the required air volume of the fume hood within the continuous emission duration based on the air volume control mode. If it is in the linkage control mode, the required air volume of other connected fume hoods also needs to be adjusted at the same time.

[0085] S106: After the fresh air is discharged, the pollutant concentration in the fume hood is re-detected, and the required air volume of the fume hood is adjusted based on the pollutant concentration.

[0086] After the fresh air discharge is completed, the current pollutant concentration inside the fume hood has reached the concentration baseline value. At this time, the pollutant concentration has dropped significantly, but exhaust dilution still needs to continue. In the next stage of exhaust circulation, it is necessary to re-detect the pollutant concentration in the fume hood, and based on the diluted pollutant concentration, set the required air volume that matches the pollutant concentration to discharge the pollutants. It can be understood that as the pollutant concentration decreases, the required air volume in the next stage will also decrease, and the operating frequency of the fan will also be adjusted accordingly. Similarly, the concentration baseline value corresponding to the pollutant concentration in the next stage also needs to be recalculated based on the current diluted pollutant concentration. In this way, the required air volume is dynamically adjusted according to the real-time changes in the pollutant concentration, which can avoid energy waste of the fan due to excessive air volume demand when the pollutant concentration drops significantly.

[0087] The above are embodiments of the method proposed in this application. Based on the same idea, some embodiments of this application also provide devices and non-volatile computer storage media corresponding to the above methods.

[0088] Figure 2 This is a schematic diagram of a variable air volume control device for a fume hood provided in an embodiment of the present application. Figure 2 As shown, including:

[0089] at least one processor; and,

[0090] at least one processor communicatively connected to a memory; wherein,

[0091] The memory stores instructions that can be executed by at least one processor. The instructions are executed by the at least one processor so that the at least one processor can execute the variable air volume control method of the fume hood as described in any one of the above items.

[0092] An embodiment of the present application provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as follows:

[0093] A method for controlling variable air volume of a fume hood as described in any one of the above items.

[0094] The various embodiments in this application are described in a progressive manner. Similar portions between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the device and medium embodiments are generally similar to the method embodiments, so their descriptions are relatively simple. For relevant portions, refer to the descriptions of the method embodiments.

[0095] The devices and media provided in the embodiments of the present application correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects to their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0096] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0097] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0098] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0100] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0101] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0102] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0103] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0104] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for controlling variable air volume of a fume hood, characterized in that: The method comprises: A sensor disposed inside the fume hood identifies the opening height corresponding to the operating port of the fume hood and collects the current pollutant concentration generated in the fume hood when the opening height is within a preset range; Determining an air volume control mode corresponding to the fume hood according to the current pollutant concentration; Acquiring experimental information of the fume hood, and determining the experimental process in which the fume hood is located based on the experimental information and the experimental operation performed in the fume hood; Determining the required air volume of the fume hood according to the current pollutant concentration, and determining the corresponding emission rate of the pollutants in the fume hood according to the experimental process and the current pollutant concentration, so as to determine the emission duration corresponding to the required air volume according to the emission rate; Based on the air volume control mode, controlling the fan to discharge fresh air corresponding to the required air volume into the fume hood within the discharge duration; After the fresh air is discharged, the pollutant concentration in the fume hood is re-detected, and the required air volume of the fume hood is adjusted based on the pollutant concentration.

2. A method for controlling variable air volume of a fume hood according to claim 1, characterized in that: Determining the air volume control mode corresponding to the fume hood according to the current pollutant concentration includes: When the current pollutant concentration is greater than a preset concentration threshold, determining that the air volume control mode corresponding to the fume hood is a linkage control mode; Otherwise, it is determined that the air volume control mode corresponding to the fume hood is the standard control mode.

3. A method for controlling variable air volume of a fume hood according to claim 2, characterized in that: After determining the required air volume of the fume hood according to the current pollutant concentration, the method further includes: When the air volume control mode is the linkage control mode, the target fume hood corresponding to the branch pipe in the ventilation state is selected from the branch pipes connected to the main ventilation duct, and the wind speeds corresponding to the fume hood and the target fume hood are obtained respectively; determining a cross-flow ratio between the fume hood and the target fume hood based on a ratio relationship between the wind speeds when the wind speed of the target fume hood is less than the wind speed of the fume hood; Based on the cross-flow ratio and the flow distance between the target fume hood and the fume hood, a target required air volume corresponding to the target fume hood is linked and adjusted.

4. A method for controlling variable air volume of a fume hood according to claim 3, characterized in that: Determining a cross-flow ratio between the fume hood and the target fume hood based on the ratio relationship between the wind speeds specifically includes: The cross-flow ratio between the fume hood and the target fume hood is determined by the following formula: Wherein, C represents the cross-flow ratio in the flow direction from the fume hood to the target fume hood, v1 represents the wind speed of the fume hood, and v2 represents the wind speed of the target fume hood.

5. A method for controlling variable air volume of a fume hood according to claim 4, characterized in that: Based on the cross-flow ratio and the flow distance between the target fume hood and the fume hood, a target required air volume corresponding to the target fume hood is adjusted in a linked manner, specifically comprising: calculating the flow rate of pollutants from the target fume hood to the fume hood according to the cross-flow ratio; calculating an attenuation factor of the pollutant flowing from the target fume hood to the fume hood according to the flow distance, and determining a flow contamination concentration of the pollutant flowing to the fume hood according to the attenuation factor and the flow amount; The compensation air volume required corresponding to the flow pollution concentration is determined, and the target air volume required corresponding to the target fume hood is adjusted in a linked manner according to the compensation air volume required.

6. A method for controlling variable air volume of a fume hood according to claim 1, characterized in that: Determining the corresponding emission rate of pollutants in the fume hood according to the experimental process and the current pollutant concentration, specifically including: According to the experimental procedure, determining the gas release rate corresponding to each pollutant; determining an emission adjustment factor corresponding to the fume hood based on a ratio between the gas release rate and the volume of the fume hood; Calculating an emission change rate of the current pollutant concentration based on the required air volume, the volume, and the current pollutant concentration; An emission rate corresponding to pollutants in the fume hood is determined based on the sum of the emission adjustment factor and the emission change rate.

7. A method for controlling variable air volume of a fume hood according to claim 1, characterized in that: Determining the discharge duration corresponding to the required air volume according to the discharge speed specifically includes: Acquiring working condition information corresponding to the experimental process; wherein the working condition information reflects the operation type corresponding to the current experimental process, and the operation type includes a self-reaction type and a manual operation type; Determining a concentration reference value corresponding to the pollutant according to the operation type; wherein the concentration reference value corresponding to the human operation type is less than the concentration reference value corresponding to the self-reaction type; The emission duration required for the pollutant to be reduced from the current pollution concentration to the concentration reference value is calculated according to the emission speed.

8. The method for controlling variable air volume of a fume hood according to claim 1, characterized in that: Collect the current pollutant concentration generated in the fume hood, specifically including: Performing component analysis on the pollutants collected by each sensor to determine the concentration of each pollutant component generated in the fume hood; Determining a pollution index factor corresponding to each pollutant component, and determining a current pollutant concentration generated in the fume hood based on the pollution index factor and the concentration of the pollutant component; Determining the required air volume of the fume hood according to the current pollutant concentration specifically includes: The required air volume for the corresponding pollutant component is calculated according to the concentration of the pollutant component, and the required air volume for the fume hood is calculated based on the required air volume corresponding to each pollutant component and the pollution index factor.

9. A variable air volume control device for a fume hood, characterized in that: The device comprises: at least one processor; and, a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for controlling the variable air volume of a fume hood as described in any one of claims 1 to 8.

10. A non-volatile computer storage medium storing computer executable instructions, characterized in that: The computer executable instructions are configured to: A method for controlling the variable air volume of a fume hood according to any one of claims 1 to 8.

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