Constant pressure variable air volume control method for barrier level laboratory animal rooms and related devices

Abstract

The application relates to a constant pressure variable air volume control method and related device for a barrier level laboratory animal room, which comprises the following steps: obtaining a current time and an indoor ammonia concentration, and selecting a mode based on the current time and the indoor ammonia concentration; wherein the selectable modes include a daytime mode and a nighttime mode; adjusting and setting a theoretical pressure difference of each functional area based on the nighttime mode, and adjusting a ventilation rate of each functional area, wherein the theoretical pressure difference of each functional area is set according to a preset pressure control gradient; calculating a theoretical air supply rate and a theoretical exhaust rate of each functional area based on the theoretical pressure difference and a functional area use condition; and adjusting a stroke time of each air supply damper based on the theoretical air supply rate and the theoretical exhaust rate. The application can adjust the working power of the system according to the day-night change and the activity level of animals, greatly saves energy while ensuring the ventilation quality, and has the advantages of green environmental protection.

Description

Technical Field

[0001] This application relates to the field of cleanrooms, and in particular to a constant pressure variable air volume control method and related apparatus for barrier-level laboratory animal rooms. Background Technology

[0002] With the development of scientific research, laboratory animals are playing an increasingly important role in various biomedical studies. Among these, SPF (Specific Pathogen Free) barrier-level laboratory animal facilities are a key component, providing a sterile environment for specific pathogens, enabling researchers to raise and study laboratory animals in a safe and controlled environment.

[0003] Environmental control in SPF barrier-level laboratory animal facilities is extremely stringent, with the design and operation of the air conditioning and ventilation system being particularly crucial. The air conditioning system must ensure stable parameters such as temperature, humidity, and air quality within the room, and must perform regular ventilation to guarantee the cleanliness and safety of the experimental environment.

[0004] However, the usage of laboratory animal facilities differs significantly at night from during the day. Due to reduced staff movement and lower animal activity levels, resulting in less metabolic waste, the air quality in the facilities is relatively better, reducing the need for ventilation. However, current air conditioning and ventilation systems generally still operate at daytime frequencies, leading to energy waste. Therefore, finding an air conditioning and ventilation system operation mode that can meet the environmental requirements of laboratory animal facilities while effectively saving energy has become an important research topic. Summary of the Invention

[0005] In order to save energy while ensuring ventilation quality, this application provides a constant pressure variable air volume control method and related device for barrier-level laboratory animal rooms.

[0006] Firstly, this application provides a constant pressure variable air volume control method for barrier-level laboratory animal rooms, which adopts the following technical solution:

[0007] A constant pressure variable air volume control method for barrier-level laboratory animal facilities includes the following steps:

[0008] S1. Obtain the current time and indoor ammonia concentration, and select a mode based on the current time and indoor ammonia concentration; the selectable modes include daytime mode and nighttime mode;

[0009] S2. Based on the night mode, adjust and set the theoretical pressure difference of each functional area and adjust the ventilation rate of each functional area. The theoretical pressure difference of each functional area is set according to the preset pressure control gradient. The functional areas include a clean corridor, a feeding room and a waste corridor.

[0010] S3. Calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas;

[0011] S4. Based on the theoretical air supply rate and theoretical air exhaust rate, adjust the stroke of each air supply valve on the time axis.

[0012] By adopting the above technical solution, the activity level of animals in the rearing room can be effectively differentiated based on time period and indoor ammonia concentration, thus establishing two operating modes: daytime and nighttime. Reducing the number of air exchanges in nighttime mode effectively lowers the energy consumption of the air conditioning system and improves energy efficiency. By setting the theoretical pressure difference and adjusting the travel time of the air supply valves, the pressure difference in each room can be stabilized, ensuring air quality. This is extremely important for experimental animal rooms, as environmental stability directly affects the effectiveness and reliability of experiments. This method selects the mode based on the current time and automatically calculates and adjusts the airflow according to the theoretical pressure difference and room usage, achieving automation of the control process. This not only reduces the workload of operators but also avoids errors that may occur during human operation, improving the accuracy and reliability of control. Furthermore, this method can be adjusted according to the actual usage of the rooms, exhibiting excellent adaptability. Changes in room usage frequency, usage time, and other factors can be effectively considered and handled by this method, ensuring the stability and reliability of the control effect.

[0013] Optionally, S1 includes the following sub-steps:

[0014] S11. Obtain the current time using the built-in clock or a network clock;

[0015] S12. Based on a preset time period, compare the current time with the preset time, wherein the preset time period includes daytime time period and nighttime time period;

[0016] S13. If the current time is during the daytime period, select the daytime mode; if the current time is during the nighttime period, determine whether the indoor ammonia concentration exceeds the preset value. If so, select the daytime mode; otherwise, select the nighttime mode.

[0017] By adopting the above technical solution, and by acquiring the current time in real time and selecting the mode based on the current time, the ventilation mode can be automatically adjusted, reducing manual intervention and improving operational efficiency. In nighttime mode, due to less human movement and dust emission, animal activity decreases, and metabolic products are reduced, allowing for a suitable reduction in the number of air exchanges and the supply and exhaust air volume, thereby saving energy. The system can automatically switch modes according to the current time, better adapting to different operating conditions and improving the system's flexibility and adaptability. Through reasonable mode selection, an appropriate pressure differential can be maintained under various conditions, avoiding safety issues caused by excessively large or small pressure differentials.

[0018] Optionally, step S2 includes the following sub-steps:

[0019] S21. When the current mode is detected as night mode, the preset pressure control gradient setting program is activated;

[0020] S22. Calculate the theoretical pressure difference for each functional zone based on the arrangement of functional zones and the preset pressure gradient;

[0021] S23. Set the calculated theoretical pressure difference as the target pressure difference for each functional zone. This target pressure difference will be used to calculate the theoretical supply air rate and the theoretical exhaust air rate.

[0022] S24. Monitor the actual pressure difference of each functional area and compare it with the theoretical pressure difference. If there is a deviation, adjust the air supply rate and exhaust rate to make the actual pressure difference close to the theoretical pressure difference.

[0023] By adopting the above technical solution, and comparing the preset pressure control gradient with the actual pressure difference, the pressure difference of each functional zone can be precisely controlled, thereby improving the safety of barrier-level laboratory animal facilities. This step allows the system to flexibly adjust the pressure gradient setting according to the current mode (day or night) to meet the needs of different modes, improving the system's flexibility and practicality. In night mode, while maintaining the pressure gradient, the overall supply and exhaust air rates are reduced, keeping the supply fan operating at a lower power level, thus saving energy. Furthermore, the implementation of step S2 is automatic, reducing the need for manual intervention and improving efficiency.

[0024] Optionally, step S3 includes the following sub-steps:

[0025] S31. Calculate the theoretical air supply rate based on the set theoretical pressure difference, where the theoretical air supply rate = volume of the feeding room × number of air changes × safety factor. The safety factor is used to consider the uncertainty and possible error of the system, and the number of air changes is set based on national standard requirements and the usage of the feeding room.

[0026] S32. Calculate the additional air supply rate based on the usage of the feeding area;

[0027] S33. Add the theoretical air supply rate and the additional air supply rate to obtain the total air supply rate;

[0028] S34. Based on the set theoretical pressure difference and the usage of the feeding room, calculate the theoretical exhaust rate and the additional exhaust rate, and add them together to obtain the total exhaust rate.

[0029] By adopting the above technical solution, the pressure differential and air quality in the animal housing can be effectively controlled under all conditions. This method considers the usage conditions of the housing and system uncertainties when calculating the theoretical supply and exhaust air rates, making the control process more precise and reliable. Furthermore, this method can dynamically adjust the supply and exhaust air rates according to actual needs, improving the system's adaptability and flexibility. In environments such as laboratory animal facilities, this method can effectively maintain a stable pressure differential and high-quality air, improving the effectiveness and reliability of experiments.

[0030] Optionally, S4 includes the following steps:

[0031] The adjustment process between the daytime mode and the nighttime mode of each air supply valve is considered as a switching task. The switching sequence includes the start time point and the stabilization time point. The difference between the air supply rate corresponding to the stabilization time point and the start time point is the difference between the theoretical air supply rate of the air supply valve in the daytime mode and the theoretical air supply rate in the nighttime mode.

[0032] Based on the mode transition time and the obtained work task sequence, the start time and stable time of the switching task are set; during the switching process from daytime mode to nighttime mode, the air supply level gradually decreases from the start time to the stable time until it reaches zero; during the switching process from nighttime mode to daytime mode, the air supply level gradually increases from zero to the stable time until it stabilizes; wherein, the air supply level is positively correlated with the air supply rate.

[0033] The working tasks of the same air supply valve during the same time period are superimposed, and the superposition results are adjusted so that the air supply level of the superposition results increases, decreases or remains unchanged in adjacent time periods, and the total air supply level of the air supply valve is lower than the preset maximum level.

[0034] Optionally, step S4 further includes the following sub-steps:

[0035] The process of adjusting the air supply rate of each feeding room's air supply valve from start to finish is considered as one work task. The work sequence of each work task is preset based on the night mode. The preset work sequence includes the start time, peak time, and end time.

[0036] Analyze the relationship between the total air supply rate and the preset maximum air supply rate in all breeding rooms at different time points. If the total air supply rate is greater than the preset maximum air supply rate, adjust the peak time point and the termination time point.

[0037] By adopting the above technical solution, the frequent switching of the air supply fan between high and low power operating states can be effectively avoided. This solution, through preset operating sequences and adjusting peak and termination times according to actual conditions, effectively prevents the total air supply rate from exceeding the preset maximum air supply rate and maintains a relatively stable air supply rate, allowing the fan to operate at a relatively low power level. When it is predicted that the air supply rate may exceed the maximum value, this method maintains stable pressure in the feeding room by extending the working time (i.e., stroke time) of the air supply valve, rather than increasing the air supply rate of the air supply valve. In this way, even when the total air supply rate is close to the maximum air supply rate, a constant airflow and pressure balance can be maintained. This design, by fine-tuning the stroke time of the air supply valve rather than the air supply rate, can further improve the energy efficiency of the air conditioning system and reduce operating costs.

[0038] Optionally, the process of adjusting the air supply rate of each feeding room's air valve from start to finish is considered as one work task. The steps of pre-setting the work sequence of each work task based on the night mode include the following steps:

[0039] S411. Divide the timeline into time periods and assign tasks to different time periods according to their work sequence;

[0040] S412. Classify the air supply level of the theoretical air supply rate corresponding to the local work tasks in each time period on the time axis. The air supply level of adjacent time periods increases, decreases or remains unchanged, and the air supply level of a work task first increases and then decreases on the time axis.

[0041] By adopting the above technical solution, and dividing the time axis into time periods, and assigning work tasks to each time period according to their work sequence, more precise and personalized airflow control can be achieved based on the usage and environmental requirements of different animal housing units at different times, improving the efficiency and accuracy of airflow control. The theoretical airflow rate corresponding to each local work task on the time axis is classified into airflow levels, allowing the system to more clearly understand and control the airflow requirements of each time period. The airflow rate is positively correlated with the airflow level; the airflow level continuously increases, decreases, or remains constant between adjacent time periods. This allows the system to smoothly adjust the airflow rate, avoiding sudden airflow changes, thereby ensuring stable pressure within the animal housing units, reducing pressure fluctuations, and lowering the possibility of contaminant transmission from the laboratory animal housing.

[0042] Optionally, the step of analyzing the relationship between the total air supply rate and the preset maximum air supply rate in all rearing rooms at different time points, and adjusting the peak time point and the termination time point if the total air supply rate is greater than the preset maximum air supply rate, includes the following steps:

[0043] S421. Monitor the opening and closing status of doors and windows in each feeding room, and add the corresponding feeding room air supply valve's working task based on the detected opening and closing actions.

[0044] S422. Superimpose the working tasks of the same air supply valve in the same time period, and adjust the superposition result so that the air supply level of the superposition result continuously increases, decreases or remains unchanged in adjacent time periods.

[0045] S423. Calculate the total air supply rate of all breeding rooms at different time periods. If the total air supply rate of all breeding rooms is greater than the preset maximum air supply rate in a certain time period, then according to the order of opening and closing of the doors and windows of the breeding rooms, postpone the peak time point and the work termination time point of the corresponding air supply valve of each breeding room, and reduce the air supply level corresponding to the peak time point until the total air supply rate is less than or equal to the preset maximum air supply rate.

[0046] S424. Based on the air supply level of the air supply valve in each breeding room, adjust the exhaust rate of the air outlet valve in each breeding room. The exhaust rate is positively correlated with the exhaust level, and the air supply level in adjacent time periods increases, decreases, or remains unchanged.

[0047] By adopting the above technical solution, and monitoring the opening and closing of doors and windows in each animal enclosure, the corresponding air supply valves in each enclosure are assigned additional tasks based on the detected opening and closing actions. This allows for rapid response to real-time environmental changes in the animal enclosures, ensuring stable pressure differentials. The tasks of the same air supply valve during the same time period are superimposed, and the superposition results are adjusted so that the air supply level continuously increases, decreases, or remains constant in adjacent time periods. This achieves a smooth transition in airflow control, avoiding pressure differential fluctuations caused by sudden changes in airflow. By calculating the total air supply rate for each time period, if the total air supply rate exceeds the preset maximum air supply rate, the peak time and termination time of the corresponding air supply valve are delayed sequentially from the enclosure with the smallest pressure differential to the enclosure with the largest pressure differential, according to the pressure gradient. The air supply level corresponding to the peak time point is also reduced, achieving dynamic optimization of airflow control and ensuring the fan operates at a relatively low power level. By adjusting the exhaust level of the air outlet valves in each rearing room based on the air supply level of the air supply valves in each rearing room, coordinated control between air supply and exhaust was achieved. This ensured both stable pressure differential in the rearing rooms and guaranteed air quality within the rearing rooms, thereby improving the safety and reliability of the experiment.

[0048] Secondly, the constant pressure variable air volume control system for barrier-level laboratory animal rooms provided in this application adopts the following technical solution:

[0049] A constant pressure variable air volume control system for a barrier-level laboratory animal facility includes:

[0050] The mode selection module is used to obtain the current time and indoor ammonia concentration, and select the mode based on the current time; the selectable modes include daytime mode and nighttime mode.

[0051] The parameter adjustment module is used to adjust and set the theoretical pressure difference of each functional area and adjust the air exchange rate of each functional area based on the night mode. The theoretical pressure difference of each functional area is set according to the preset pressure control gradient. The functional areas include a clean corridor, a feeding room and a waste corridor.

[0052] The calculation module is used to calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas;

[0053] The adjustment module is used to adjust the stroke time of each air supply valve based on the theoretical air supply rate and theoretical air exhaust rate.

[0054] By adopting the above technical solution, and by distinguishing between daytime and nighttime modes, and reducing the number of air exchanges in nighttime mode, this method can effectively reduce the energy consumption of the air conditioning system and improve energy efficiency. By setting the theoretical pressure difference and adjusting the travel time of the air supply valves, this method can ensure stable pressure differences in each room and guarantee air quality. This is extremely important for experimental animal facilities, as environmental stability directly affects the effectiveness and reliability of experiments. This method selects the mode based on the current time and automatically calculates and adjusts the airflow according to the theoretical pressure difference and room usage, thus automating the control process. This not only reduces the workload of operators but also avoids errors that may occur during human operation, improving the accuracy and reliability of control. Furthermore, this method can be adjusted according to the actual usage of the rooms, exhibiting excellent adaptability. Whether it's the frequency of room use, usage time, or changes in other factors, this method can effectively consider and handle them, ensuring the stability and reliability of the control effect.

[0055] Thirdly, the computer device provided in this application adopts the following technical solution:

[0056] A computer device comprising:

[0057] One or more processors;

[0058] Memory;

[0059] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications being configured to: perform the above-described constant pressure variable air volume control method for barrier-level laboratory animal rooms.

[0060] Fourthly, the computer-readable storage medium provided in this application adopts the following technical solution:

[0061] A computer-readable storage medium storing a computer program that can be loaded by a processor and executed as described above.

[0062] The storage medium stores at least one instruction, at least one program, code set, or instruction set, which is loaded and executed by the processor to implement the constant pressure variable air volume control method for barrier-level experimental animal rooms as described above. Attached Figure Description

[0063] Figure 1 A flowchart illustrating a constant pressure variable air volume control method for a barrier-level laboratory animal facility according to an embodiment of the present invention is shown.

[0064] Figure 2 A flowchart illustrating sub-step S1 in one embodiment of the present invention is shown.

[0065] Figure 3 A schematic diagram of the structure of a barrier-level experimental animal room is shown in one embodiment of the present invention.

[0066] Figure 4 A flowchart illustrating sub-step S2 in one embodiment of the present invention is shown.

[0067] Figure 5 A flowchart illustrating sub-step S3 in one embodiment of the present invention is shown.

[0068] Figure 6 A flowchart illustrating sub-step S4 in one embodiment of the present invention is shown.

[0069] Figure 7 A flowchart illustrating sub-step S41 in one embodiment of the present invention is shown.

[0070] Figure 8 A flowchart illustrating sub-step S42 in one embodiment of the present invention is shown. Detailed Implementation

[0071] The present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application.

[0072] In the following description, numerous specific details are set forth for purposes of explanation in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described. Furthermore, the language used in this disclosure has been primarily chosen for readability and instructional purposes and may not have been chosen to define or limit the subject matter of the invention, thus requiring the necessary claims to determine such inventive subject matter. References to “an embodiment” or “an embodiment” in this disclosure mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment, and multiple references to “an embodiment” or “an embodiment” should not be construed as necessarily referring to the same embodiment.

[0073] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category whose specific examples can be used for illustration. Therefore, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.” The term “or” means any of the options and any combination of the options, including all options unless explicitly indicated that the options are mutually exclusive. The phrase “at least one of” when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all items listed unless explicitly defined as such.

[0074] This application discloses a constant pressure variable air volume control method for barrier-level laboratory animal facilities. The constant pressure variable air volume control method provided in this embodiment is applied in a constant pressure variable air volume control system for barrier-level laboratory animal facilities. This control system includes a client and a server, wherein the client communicates with the server via a network. The client, also known as a user terminal, refers to a program that provides local services to the client in relation to the server. Further, the client can be a computer program, a smart device APP program, or a third-party app embedded in other APPs. The client can be installed on various personal computers, laptops, smartphones, tablets, and portable wearable devices. The server can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0075] Laboratory animal facilities typically require strict environmental control, including temperature, humidity, lighting, noise, and air quality. Air quality control is primarily achieved through the ventilation function of the air conditioning system. During the day, due to frequent human activity, laboratory animal facilities need to maintain high-frequency ventilation to ensure air quality. However, at night, with reduced human activity, the rate of pollutant formation in the animal housing decreases, and high-frequency ventilation is not necessary.

[0076] In traditional air conditioning control methods, the air conditioning system sets the air exchange rate based on the highest demand (i.e., daytime demand). This results in a high air exchange rate at night, leading to energy waste. Furthermore, due to varying usage patterns in different functional areas, a fixed air exchange rate cannot meet the needs of all areas. This may cause air quality in some areas to fall below standards, or an overall reduction in airflow may cause pressure variations and disturbances between functional areas. Therefore, in current engineering practices, nighttime airflow reduction operations are rarely implemented. It should be noted that the "air exchange rate" in this application embodiment uses standard terminology from the cleanroom industry, equivalent to air exchange frequency, i.e., the number of air exchanges per unit time, expressed in units such as times per hour.

[0077] To address this issue, we propose a constant pressure variable air volume control method for barrier-level laboratory animal facilities. This method selects a mode based on the current time, including daytime and nighttime modes, and adjusts the theoretical pressure difference of each functional zone and the travel time of the air supply valves according to the selected mode.

[0078] For example, in daytime mode, due to frequent human activity, a high air exchange rate and a large theoretical pressure difference can be set to ensure air quality. However, in nighttime mode, with reduced human activity and lower animal activity levels, resulting in less metabolic waste, the air exchange rate can be reduced and a smaller theoretical pressure difference can be set to save energy.

[0079] This method not only allows for dynamic adjustment of ventilation strategies based on the actual usage of the experimental animal facility, thus improving air quality, but also saves energy and improves the operating efficiency of the air conditioning system while meeting environmental requirements.

[0080] Specifically, refer to Figure 1 The constant pressure variable air volume control method used in this barrier-level experimental animal facility includes S1-S4.

[0081] S1. Obtain the current time and indoor ammonia concentration, and select a mode based on the current time and indoor ammonia concentration; the selectable modes include daytime mode and nighttime mode.

[0082] By using time periods and indoor ammonia concentrations, the activity levels of animals in the enclosure can be effectively differentiated, allowing for the creation of daytime and nighttime operating modes. Reducing air exchange rates during nighttime mode effectively lowers the energy consumption of the air conditioning system and improves energy efficiency.

[0083] Specifically, refer to Figure 2 S1 may include sub-steps S11-S13.

[0084] S11. Use the built-in clock or network clock to get the current time.

[0085] The current time can be obtained using either the built-in hardware clock or a network clock via a network connection. For example, if the system is running on an embedded device, we can read the hardware clock using the API provided by the embedded operating system to obtain the current system time. If the system is running on a device connected to the internet, we can obtain the time from a network time server via a network protocol (such as NTP) as the current time.

[0086] S12. Based on a preset time period, compare the current time with the preset time, where the preset time period includes daytime and nighttime periods.

[0087] For example, the system can preset daytime and nighttime periods. For instance, the daytime period can be set to 6 AM to 8 PM, and the nighttime period to 8 PM to 6 AM the next day. Once the current time is obtained, it can be compared with the preset time periods.

[0088] S13. If the current time is during the daytime period, select the daytime mode; if the current time is during the nighttime period, determine whether the indoor ammonia concentration exceeds the preset value. If so, select the daytime mode; otherwise, select the nighttime mode.

[0089] Indoor ammonia concentration is used to characterize the activity level of animals in the enclosure; the higher the animal activity, the higher the indoor ammonia concentration will generally be. For example, if the current time is 7:30 AM, which falls within the preset daytime period, then daytime mode is selected. If the current time is 9:30 PM, which falls within the preset nighttime period, then it is necessary to determine whether the indoor ammonia concentration exceeds the preset value. If it is below the preset threshold, then nighttime mode is selected. In this way, different operating modes can be dynamically selected based on the current time.

[0090] By acquiring the current time in real time and selecting the mode accordingly, the ventilation mode can be automatically adjusted, reducing manual intervention and improving operational efficiency. In nighttime mode, due to reduced human movement and dust emission, and lower animal activity, the supply and exhaust air rates can be appropriately reduced, thus saving energy. The system can automatically switch modes, better adapting to different operating conditions and improving its flexibility and adaptability. Through reasonable mode selection, an appropriate pressure differential can be maintained under various conditions, avoiding safety issues caused by excessively large or small pressure differentials.

[0091] S2. Based on the night mode, adjust and set the theoretical pressure difference of each functional area and increase the ventilation rate of the animal room. The theoretical pressure difference of each functional area is set according to the preset pressure control gradient.

[0092] A pressure gradient refers to the rate of change of pressure in a space. In this application, the pressure gradient refers to the pressure difference between functional zones, that is, the pressure change from one functional zone to another. This is a control strategy aimed at ensuring that the pressure in each functional zone is maintained at an appropriate level, thereby controlling airflow, ensuring environmental quality, and saving energy.

[0093] For example, refer to Figure 3 Suppose there are three functional areas, referred to as the clean corridor, the feeding room, and the waste corridor, arranged as shown in the diagram. In the diagram, VAV is a variable air volume valve, FL is an airflow sensor, HPA is a differential pressure transmitter, and AC is an ammonia concentration sensor. To prevent airborne pollutants from flowing from the feeding room and waste corridor into the clean corridor, the supply air pressure in the clean corridor needs to be higher than that in the feeding room. To achieve this, the pressure in each room can be adjusted by controlling the opening degree of the supply and exhaust air valves, creating a decreasing pressure gradient from the clean corridor to the feeding room and then to the waste corridor. This is known as "room-by-room air supply according to pressure gradient." It's important to note that air supply according to pressure gradient can be applied to each functional area simultaneously or separately at different times.

[0094] This method selects the mode based on the current time and automatically calculates and adjusts the air volume according to the theoretical pressure difference and the usage of the functional area, thus automating the control process.

[0095] Specifically, refer to Figure 4 S2 may include sub-steps S21-S24.

[0096] S21. When the current mode is detected as night mode, the preset pressure control gradient setting program is activated;

[0097] S22. Calculate the theoretical pressure difference for each functional zone based on the arrangement of functional zones and the preset pressure gradient;

[0098] S23. Set the calculated theoretical pressure difference as the target pressure difference for each functional zone. This target pressure difference will be used to calculate the theoretical supply air rate and the theoretical exhaust air rate.

[0099] S24. Monitor the actual pressure difference in each room and compare it with the theoretical pressure difference. If there is a deviation, adjust the supply air rate and exhaust air rate to make the actual pressure difference closer to the theoretical pressure difference.

[0100] By comparing the preset pressure control gradient with the actual pressure difference, the pressure difference in each room can be precisely controlled, thereby improving the safety of barrier-level laboratory animal facilities. This step allows the system to flexibly adjust the pressure gradient setting according to the current mode (day or night) to meet the needs of different modes. This improves the system's flexibility and practicality. In night mode, adjusting the pressure gradient setting reduces the overall supply and exhaust air rates, thus saving energy. Furthermore, the implementation of step S2 is automated, reducing the need for manual intervention and improving efficiency.

[0101] Additionally, when switching between daytime and nighttime modes, the pressure difference between different functional areas needs to be adjusted according to the pressure gradient. The pressure difference values ​​follow the order: clean corridor > feeding area > waste corridor.

[0102] Switching to night mode: First, reduce the airflow in the waste corridor; then, according to a preset algorithm, sequentially reduce the airflow in each feeding room; finally, reduce the airflow in the clean corridor. During this period, the exhaust volume is adjusted in real time based on feedback from the differential pressure transmitter to maintain the pressure difference in each room. The overall system pressure gradient remains constant throughout the entire process.

[0103] Switching to daytime mode: First, increase the airflow in the cleaning corridor; then, according to a preset algorithm, sequentially increase the airflow in each animal husbandry room; finally, increase the airflow in the cleaning corridor. During this period, the exhaust volume is adjusted in real time based on feedback from the differential pressure transmitter to maintain the pressure difference in each room. The overall system pressure gradient remains constant throughout the entire process.

[0104] The preset algorithm here is determined based on parameters such as the distribution location of the feeding rooms in the piping system, the total air exchange caused by the pressure difference changes required by the feeding rooms based on their own volume, and the pressure difference values ​​of the functional zones. For example, the distance of different feeding rooms from the blower and their relative positions on the piping branches can all affect the air volume, air rate, and timing of air supply. Regarding the pressure difference value, when reducing the air volume, the adjustment starts from the functional zone with the lowest pressure difference and gradually moves to the functional zone with the highest pressure difference to ensure the maintenance of the pressure gradient; the opposite is true when increasing the air volume. Due to these factors, irregular and drastic fluctuations can easily occur during the air supply process due to different requirements of different feeding rooms, different requirements of different functional zones, irregular movements of personnel and animals within the feeding rooms, and switching of air supply modes. This can easily lead to rapid switching of the blower between high-power and low-power operation, which is detrimental to energy conservation and environmental protection. At the same time, excessively frequent pressure difference changes can also easily lead to the accidental spread of pollution. Therefore, air supply levels are introduced in steps S3 and S4 to address this issue. S3. Calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas.

[0105] Specifically, refer to Figure 5 S3 may include sub-steps S31-S34.

[0106] S31. Calculate the theoretical air supply rate based on the set theoretical pressure difference, where the theoretical air supply rate = volume of the feeding room × number of air changes × safety factor. The safety factor is used to consider the uncertainty and possible error of the system, and the number of air changes is set based on the theoretical pressure difference.

[0107] S32. Calculate the additional air supply rate based on the usage of the feeding area;

[0108] S33. Add the theoretical air supply rate and the additional air supply rate to obtain the total air supply rate;

[0109] S34. Based on the set theoretical pressure difference and the usage of the feeding room, calculate the theoretical exhaust rate and the additional exhaust rate, and add them together to obtain the total exhaust rate.

[0110] This process ensures effective control of pressure differential and air quality within the animal housing under all conditions. When calculating theoretical supply and exhaust air rates, this method considers the usage of the housing and system uncertainties, resulting in more precise and reliable control. Furthermore, this method allows for dynamic adjustment of supply and exhaust air rates according to actual needs, improving the system's adaptability and flexibility. In environments such as laboratory animal facilities, this method effectively maintains stable pressure differentials and high-quality air, enhancing the effectiveness and reliability of experiments.

[0111] S4. Based on the theoretical air supply rate and theoretical air exhaust rate, adjust the stroke of each air supply valve on the time axis.

[0112] The travel of the air supply valve on the time axis includes its position on the time axis during the working period, as well as the degree of opening of the air supply valve at different points in time during the working period. In this step, by setting the theoretical pressure difference and adjusting the travel of the air supply valve on the time axis, this method can ensure the stability of the pressure difference in each room and ensure air quality.

[0113] Specifically, refer to Figure 6 S4 may include sub-steps S41-S42.

[0114] S41. The process from the start to the end of the air supply valve is considered as one work task. The work sequence of each work task is preset based on the night mode. The preset work sequence includes the start time, peak time and end time.

[0115] This method effectively avoids frequent switching between high and low power operation of the air supply fan. By pre-setting the operating sequence and adjusting the peak and termination times according to actual conditions, it effectively prevents the total air supply rate from exceeding the preset maximum air supply rate and maintains a relatively stable air supply rate, allowing the fan to operate at a relatively low power level. When it is predicted that the air supply rate may exceed the maximum value, this method maintains stable pressure in the feeding room by extending the working time (i.e., stroke time) of the air supply valve, rather than increasing the air supply rate of the air supply valve. In this way, even when the total air supply rate is close to the maximum air supply rate, a constant airflow and pressure balance can be maintained.

[0116] This design effectively prevents excessive pressure differences between rooms due to high air supply rates, reducing the possibility of contaminant transmission and improving the safety of barrier-level laboratory animal facilities. Furthermore, by fine-tuning the travel time of the air supply valves instead of the air supply rate, the energy efficiency of the air conditioning system can be further improved, reducing operating costs.

[0117] Specifically, refer to Figure 7 S41 may include sub-steps S411-S412.

[0118] S411. Divide the timeline into time periods and assign tasks to different time periods according to their work sequence.

[0119] Take night mode as an example. The night mode time period can be preset to 22:00 to 6:00 the next day. Within this time period, the working task of the air supply valve can be further divided into multiple time periods. For example, if each minute is a time period, then night mode will be divided into 480 time periods. It should be noted that the more time periods are divided, the more precise the air supply control, but the heavier the computational load on the system.

[0120] S412. Classify the air supply level according to the theoretical air supply rate corresponding to the local work tasks in each time period on the time axis. The air supply level is positively correlated with the air supply rate. The air supply level of adjacent time periods increases, decreases or remains unchanged. The air supply level of a work task first increases and then decreases on the time axis.

[0121] For example, the theoretical air supply rate of the air supply valve's working task in each time period can be further divided into multiple air supply levels. Taking a specific breeding room as an example, the air inlet valve of this breeding room opens at 22:00. The period from 22:00 to 22:01 corresponds to the start-up time, and the theoretical air supply rate can be set to 5 m³ / h, corresponding to air supply level 1. The theoretical air supply rate from 22:01 to 22:02 can be set to 10 m³ / h, corresponding to air supply level 2; and so on, until 22:10 to 22:11, corresponding to the peak time, when the air supply level reaches its maximum. After that, the theoretical air supply rate gradually decreases, and the air supply level also decreases accordingly. This completes the classification of air supply levels based on the theoretical air supply rate. In this example, the air supply level shows a trend of first increasing and then decreasing on the time axis. It should be noted that in different embodiments, the rate corresponding to a recent level can be a fixed value or an average value, while the overall rate can be adjusted to smoothly increase or decrease based on the levels of the preceding and following time periods. For example, if the level is 2 in the previous period, 3 in the current period, and 4 in the later period, then the air supply rate in the current period will increase smoothly.

[0122] In summary, by dividing the time axis into time periods and assigning tasks to these periods according to their sequence, more precise and personalized airflow control can be implemented based on the usage and environmental requirements of the animal housing at different times, improving the efficiency and accuracy of airflow control. Classifying the theoretical airflow rate corresponding to local tasks within each time period on the time axis into airflow levels allows the system to more clearly understand and control the airflow requirements for each period. The airflow rate is positively correlated with the airflow level; the airflow level continuously increases, decreases, or remains constant between adjacent time periods. This allows the system to smoothly adjust the airflow rate, avoiding sudden airflow changes, thus ensuring stable pressure within the housing, reducing pressure fluctuations, and lowering the possibility of contaminant transmission within the animal housing.

[0123] It should be noted that in this application, the air intake rate of the air supply valve that maintains the stable conditions of the breeding room at night is the theoretical air supply rate, and the additional air intake rate corresponding to the workers is the extra air supply rate. The sum of the theoretical air intake rate and the extra air intake rate is called the total air supply rate.

[0124] S42. Analyze the relationship between the total air supply rate and the preset maximum air supply rate at each time point. If the total air supply rate is greater than the preset maximum air supply rate, adjust the peak time point and the termination time point.

[0125] Specifically, refer to Figure 8 S42 may include sub-steps S421-S424.

[0126] S421. Monitor the opening and closing status of doors and windows in each breeding room, and add the corresponding working tasks of the air supply valves in the breeding room based on the detected opening and closing actions.

[0127] For example, if the doors and windows of breeding room A are opened at 22:30, the control system will detect this action and then add a new task to the air supply valve of breeding room A. This task starts at 22:30, and the peak time air supply level is set to level 1. In addition, the theoretical air supply level of breeding room A is level 5.

[0128] S422. Superimpose the working tasks of the same air supply valve during the same time period, and adjust the superimposed result so that the air supply level of the superimposed result increases, decreases or remains unchanged in adjacent time periods, and the air supply level first increases and then decreases on the time axis.

[0129] For example, between 22:30 and 23:00, the air supply valves in both rearing rooms A and B maintain their theoretical air supply rates, corresponding to a theoretical air supply level of 5. If rearing rooms A and B have multiple additional tasks during this period, the control system will sum the theoretical air supply levels of these two rearing rooms at different times and the additional air supply levels of the tasks to obtain the total air supply level. If the total air supply level, after summing, exceeds the preset maximum air supply rate of the air supply fan at a certain point in time, the control system will adjust the operating tasks of the air supply valves in these two rearing rooms to ensure that the summed air supply level continuously increases, decreases, or remains unchanged in adjacent time periods.

[0130] In a further example, suppose that in breeding room A, an experiment requiring a large amount of ventilation is expected at 22:00. To meet the ventilation requirements of this operation, breeding room A will have an additional task, with the air supply valve scheduled to operate between 22:00 and 22:20, peaking at 22:10 when the air supply level gradually increases from level 0 to level 5 and then decreases back to level 0.

[0131] However, at 22:08, the monitoring system detected that the door and window of breeding room A were suddenly opened, which may have been due to personnel entering or leaving the breeding room or other reasons. Based on this window opening action, the control system decided to add a corresponding air supply valve operation task to maintain the air quality in the breeding room, with the start time point at 20:08, the peak time point at 20:10, and the end time point at 20:12.

[0132] In this way, the control system can flexibly adjust the working task of the air supply valve according to the actual situation, which can not only meet the air exchange needs in the breeding room, but also ensure the stability of the system operation.

[0133] S423. Calculate the total air supply rate of all breeding rooms at different time periods. If the total air supply rate of all breeding rooms is greater than the preset maximum air supply rate at a certain time period, then according to the order of opening and closing of the doors and windows of the breeding rooms, postpone the peak time point and the work termination time point of the corresponding air supply valve of each breeding room, and reduce the air supply level corresponding to the peak time point until the total air supply rate is less than or equal to the preset maximum air supply rate.

[0134] For a single room, assuming that the theoretical air supply level of breeding room A is 3, and the maximum air supply level that the air supply fan can support in low power mode is 10, then breeding room A has two tasks during the period of 22:00-22:10. One is the originally planned task, in which the air supply level gradually increases from 0 to 5; the other is the additional task due to the opening of the window, in which the air supply level decreases from 0 to 3 and then back to 0.

[0135] At this point, the control system needs to superimpose these two tasks. If directly superimposed, the air supply level at 20:10 reaches its maximum value, level 11. This air supply level exceeds the maximum capacity of the nighttime air supply fan in low-power mode. Therefore, the control system needs to adjust the superposition result to ensure the air supply level remains within a reasonable range.

[0136] Specifically, the control system may choose to slightly reduce the air supply level at peak times for both the originally planned tasks and newly added tasks so that the overall air supply level remains within a reasonable range.

[0137] For multiple rooms, the theoretical air supply levels are not the same, and the order in which the doors and windows of the rearing rooms open and close actually represents the order in which the pressure difference in the rearing rooms changes abnormally. For example, the control system will calculate the total air supply rate during the period from 22:30 to 23:00. If the total air supply rate is greater than the preset maximum air supply rate, the control system will follow the order in which the doors and windows of the rearing rooms open, from the rearing room with the first door to open (e.g., rearing room A) to the rearing room with the last door to open (e.g., rearing room B), delaying the peak time point and the working end time point of the corresponding air supply valve for each rearing room, and reducing the air supply level corresponding to the peak time point, until the total air supply rate at each time point is less than or equal to the preset maximum air supply rate.

[0138] Alternatively, the peak time and end time of the corresponding air supply valves can be arranged according to the pressure difference, from low to high. In a further example, suppose that during the period from 22:30 to 23:00, the air supply valves of three breeding rooms need to be operated: breeding room A, breeding room B, and breeding room C. The total air supply rates of each breeding room are 10 m³ / h, 15 m³ / h, and 20 m³ / h, respectively, so the total air supply rate of the three breeding rooms is 45 m³ / h. Assuming that the preset maximum air supply rate is 40 m³ / h, then at this time, the total air supply rate exceeds the preset maximum air supply rate.

[0139] To address this issue, the control system adjusts the pressure gradient from the room with the smallest pressure difference to the room with the largest. In this case, let's assume room A has the smallest pressure difference, room B has a moderate pressure difference, and room C has the largest pressure difference. The control system will first adjust the operation of the air supply valve in room A.

[0140] Specifically, the control system will delay the peak time and the end time of the air supply valve in breeding room A, and reduce the air supply level corresponding to the peak time. For example, if the peak time of breeding room A was originally 22:45, it may now be delayed to 22:47. At the same time, the air supply level at the peak time will also be reduced from the highest level to a lower level.

[0141] The control system then recalculates the total airflow rate. If the total airflow rate is still greater than the preset maximum airflow rate, the control system makes the same adjustment for housing B, and then for housing C. This process continues until the total airflow rate is less than or equal to the preset maximum airflow rate.

[0142] In this way, the control system can ensure that the air supply rate of the entire system is within an acceptable range, while maintaining the pressure difference between each feeding room as stable as possible, so as to ensure air quality and energy saving.

[0143] S424. Based on the air supply level of the air supply valve in each breeding room, adjust the exhaust level of the air outlet valve in each breeding room. The exhaust rate is positively correlated with the air supply level, and the air supply level in adjacent time periods increases, decreases, or remains unchanged.

[0144] After adjusting the air supply level of the air supply valves in each rearing room, the control system will adjust the exhaust level of the air outlet valves in each rearing room accordingly based on these new air supply levels. For example, if the air supply level of the air supply valve in rearing room A is reduced, the control system will also reduce the exhaust level of the air outlet valve in rearing room A to maintain a stable pressure differential in the rearing room.

[0145] By monitoring the opening and closing of doors and windows in each animal enclosure and adjusting the corresponding air supply valves based on the detected opening and closing actions, a rapid response to real-time environmental changes in the animal enclosures can be achieved, ensuring stable pressure differentials within the enclosures. By superimposing the operating tasks of the same air supply valve during the same time period and adjusting the superimposed results to ensure that the air supply level continuously increases, decreases, or remains constant in adjacent time periods, a smooth transition in airflow control is achieved, avoiding pressure differential fluctuations caused by sudden changes in airflow.

[0146] In addition, S4 also includes the following steps:

[0147] The adjustment process between the daytime mode and the nighttime mode of each air supply valve is considered as a switching task. The switching sequence includes the start time point and the stabilization time point. The difference between the air supply rate corresponding to the stabilization time point and the start time point is the difference between the theoretical air supply rate of the air supply valve in the daytime mode and the theoretical air supply rate in the nighttime mode.

[0148] Based on the mode change time point and the obtained work task sequence, the start time point and stable time point of the switching task are set; during the switching process from daytime mode to nighttime mode, the air supply level gradually decreases from the start time point to the stable time point until it reaches zero; during the switching process from nighttime mode to daytime mode, the air supply level gradually increases from zero to the stable time point until it stabilizes.

[0149] The working tasks of the same air supply valve during the same time period are superimposed, and the superposition results are adjusted so that the air supply level of the superposition results increases, decreases or remains unchanged in adjacent time periods, and the total air supply level of the air supply valve is lower than the preset maximum level.

[0150] For example, if the theoretical air supply level of a certain breeding room is level 5, then the switching task generated when changing from daytime mode to nighttime mode involves a change from an additional air supply level of level 3 to level 0. This level remains unchanged after reaching level 0 until the mode changes again; the peak time is when the additional air supply level reaches level 0. Similarly, the switching task generated when changing from nighttime mode to daytime mode involves a change from an additional air supply level of level 0 to level 3. This level remains unchanged after reaching level 3 until the mode changes again; the peak time is when the additional air supply level reaches level 3.

[0151] In summary, by calculating the total air supply rate for each time period, if the total air supply rate exceeds the preset maximum air supply rate, the peak time and end time of the corresponding air supply valves for each rearing room are delayed according to the pressure gradient, from the rearing room with the smallest pressure difference to the rearing room with the largest pressure difference. The air supply level corresponding to the peak time point is also reduced, achieving dynamic optimization of airflow control and avoiding fan overload. By adjusting the exhaust level of the outlet air valves in each rearing room based on the air supply level of the air supply valves, coordinated control between air supply and exhaust is achieved. This ensures stable pressure difference in the rearing rooms and guarantees air quality within the rearing rooms, improving the safety and reliability of the experiment.

[0152] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0153] In one embodiment, a constant pressure variable air volume control device for a barrier-level laboratory animal facility is provided. This device corresponds one-to-one with the constant pressure variable air volume control method for barrier-level laboratory animal facilities described in the previous embodiment. The device includes a mode selection module, a parameter adjustment module, a calculation module, and an adjustment module. Detailed descriptions of each functional module are as follows:

[0154] The mode selection module is used to obtain the current time and indoor ammonia concentration, and select the mode based on the current time; the selectable modes include daytime mode and nighttime mode.

[0155] The parameter adjustment module is used to adjust and set the theoretical pressure difference of each functional zone and adjust the ventilation rate of each functional zone based on the night mode. The theoretical pressure difference of each functional zone is set according to the preset pressure control gradient. The functional zones include a clean corridor, a feeding room and a waste corridor.

[0156] The calculation module is used to calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas;

[0157] The adjustment module is used to adjust the stroke time of each air supply valve based on the theoretical air supply rate and theoretical air exhaust rate.

[0158] Specific limitations regarding the constant pressure variable air volume control device for barrier-level laboratory animal facilities can be found in the above-mentioned limitations on the constant pressure variable air volume control method for barrier-level laboratory animal facilities, and will not be repeated here. Each module in the aforementioned constant pressure variable air volume control device for barrier-level laboratory animal facilities can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0159] In one embodiment, a computer device is provided, which may be a server. The computer device includes a processor, memory, a network interface, and a database connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database contains data related to a constant pressure variable air volume control method for barrier-level laboratory animal facilities. The network interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a constant pressure variable air volume control method for barrier-level laboratory animal facilities.

[0160] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the constant pressure variable air volume control method for barrier-level laboratory animal rooms described in the above embodiment, for example... Figure 1 Steps S1 to S4 are shown. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit of the constant pressure variable air volume control device for the barrier-level laboratory animal facility described in the above embodiments. To avoid repetition, these will not be elaborated further here.

[0161] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When executed by a processor, the computer program implements the constant pressure variable air volume control method for barrier-level experimental animal rooms described in the above embodiments, for example... Figure 1 Steps S1 to S4 are shown. Alternatively, when the computer program is executed by the processor, it implements the functions of each module / unit in the constant pressure variable air volume control device for the barrier-level laboratory animal room in the above-described device embodiments. To avoid repetition, it will not be described again here.

[0162] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments of this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0163] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0164] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A constant pressure variable air volume control method for barrier-level laboratory animal rooms, characterized in that, Includes the following steps: S1. Obtain the current time and indoor ammonia concentration, and select a mode based on the current time and indoor ammonia concentration; the selectable modes include daytime mode and nighttime mode; S2. Based on the night mode, adjust and set the theoretical pressure difference of each functional area and adjust the ventilation rate of each functional area. The theoretical pressure difference of each functional area is set according to the preset pressure control gradient. The functional areas include a clean corridor, a feeding room and a waste corridor. S3. Calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas; S4. Based on the theoretical supply air rate and theoretical exhaust air rate, adjust the stroke of each supply air valve on the time axis; S2 includes the following sub-steps: S21. When the current mode is detected as night mode, the preset pressure control gradient setting program is activated; S22. Calculate the theoretical pressure difference for each functional zone based on the arrangement of functional zones and the preset pressure gradient; S23. Set the calculated theoretical pressure difference as the target pressure difference for each functional zone. This target pressure difference will be used to calculate the theoretical supply air rate and the theoretical exhaust air rate. S24. Monitor the actual pressure difference in each room and compare it with the theoretical pressure difference. If there is a deviation, adjust the supply air rate and exhaust air rate to make the actual pressure difference closer to the theoretical pressure difference. S3 includes the following sub-steps: S31. Calculate the theoretical air supply rate based on the set theoretical pressure difference, where the theoretical air supply rate = volume of the feeding room × number of air changes × safety factor. The safety factor is used to consider the uncertainty and possible error of the system, and the number of air changes is set based on national standard requirements and the usage of the feeding room. S32. Calculate the additional air supply rate based on the usage of the feeding area; S33. Add the theoretical air supply rate and the additional air supply rate to obtain the total air supply rate; S34. Based on the set theoretical pressure difference and the usage of the feeding room, calculate the theoretical exhaust rate and the additional exhaust rate, and add them together to obtain the total exhaust rate; S4 includes the following steps: The adjustment process between the daytime mode and the nighttime mode of each air supply valve is considered as a switching task. The switching sequence includes the start time point and the stabilization time point. The difference between the air supply rate corresponding to the stabilization time point and the start time point is the difference between the theoretical air supply rate of the air supply valve in the daytime mode and the theoretical air supply rate in the nighttime mode. Based on the mode transition time and the obtained work task sequence, the start time and stable time of the switching task are set; during the switching process from daytime mode to nighttime mode, the air supply level gradually decreases from the start time to the stable time until it reaches zero; during the switching process from nighttime mode to daytime mode, the air supply level gradually increases from zero to the stable time until it stabilizes; wherein, the air supply level is positively correlated with the air supply rate. The working tasks of the same air supply valve during the same time period are superimposed, and the superposition results are adjusted so that the air supply level of the superposition results increases, decreases or remains unchanged in adjacent time periods, and the total air supply level of the air supply valve is lower than the preset maximum level.

2. The air volume control method according to claim 1, characterized in that, S4 further includes the following sub-steps: The process of adjusting the air supply rate of each feeding room's air supply valve from start to finish is considered as one work task. The work sequence of each work task is preset based on the night mode. The preset work sequence includes the start time, peak time, and end time. Analyze the relationship between the total air supply rate and the preset maximum air supply rate in all breeding rooms at different time points. If the total air supply rate is greater than the preset maximum air supply rate, adjust the peak time point and the termination time point.

3. The air volume control method according to claim 2, characterized in that, The process of adjusting the air supply rate of each feeding room's air valve from start to finish constitutes one work task. The steps, based on the night mode and pre-setting the work sequence of each task, include: Divide the timeline into time periods and assign tasks to different time periods according to their work sequence. The theoretical air supply rate corresponding to the local work tasks in each time period on the time axis is divided into air supply levels. The air supply levels of adjacent time periods increase, decrease or remain unchanged, and the air supply level of a work task first increases and then decreases on the time axis.

4. The air volume control method according to claim 3, characterized in that, The step of analyzing the relationship between the total air supply rate and the preset maximum air supply rate in all rearing rooms at different time points, and adjusting the peak time point and the termination time point if the total air supply rate is greater than the preset maximum air supply rate, includes: Monitor the opening and closing status of doors and windows in each feeding room, and increase the workload of the corresponding air supply valves in the feeding room based on the detected opening and closing actions. The working tasks of the same air supply valve during the same time period are superimposed, and the superposition results are adjusted so that the air supply level of the superposition results continuously increases, decreases or remains unchanged in adjacent time periods. Calculate the total air supply rate of all breeding rooms at different time periods. If the total air supply rate of all breeding rooms is greater than the preset maximum air supply rate at a certain time period, then according to the order of opening and closing of the doors and windows of the breeding rooms, postpone the peak time point and the work termination time point of the corresponding air supply valve of each breeding room, and reduce the air supply level corresponding to the peak time point until the total air supply rate is less than or equal to the preset maximum air supply rate. Based on the air supply level of the air supply valves in each breeding room, the exhaust rate of the air outlet valves in each breeding room is adjusted. The exhaust rate is positively correlated with the air supply level, and the air supply level in adjacent time periods increases, decreases, or remains unchanged.

5. A constant pressure variable air volume control system for a barrier-level laboratory animal facility, characterized in that, A constant pressure variable air volume control method for barrier-level laboratory animal rooms as described in any one of claims 1-4, comprising: The mode selection module is used to obtain the current time and indoor ammonia concentration, and select the mode based on the current time; the selectable modes include daytime mode and nighttime mode. The parameter adjustment module is used to adjust and set the theoretical pressure difference of each functional zone and adjust the ventilation rate of each functional zone based on the night mode. The theoretical pressure difference of each functional zone is set according to the preset pressure control gradient. The functional zones include a clean corridor, a feeding room and a waste corridor. The calculation module is used to calculate the theoretical supply air rate and theoretical exhaust air rate of each functional area based on the theoretical pressure difference and the usage of the functional areas; The adjustment module is used to adjust the stroke time of each air supply valve based on the theoretical air supply rate and theoretical air exhaust rate.

6. A computer device, characterized in that, It includes: One or more processors; Memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications being configured to: perform the constant pressure variable air volume control method for barrier-level laboratory animal rooms according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The storage medium stores at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement: the constant pressure variable air volume control method for barrier-level experimental animal rooms as described in any one of claims 1 to 4.

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