A method and system for low temperature warehouse air treatment

Abstract

The application relates to the field of air conditioning and ventilation technology, and discloses a low-temperature warehouse air treatment method and system. Current operation information of a low-temperature warehouse is acquired, and a current air treatment mode and a target air treatment mode are determined according to the current operation information. A preset mode sending and discharging corresponding table is used to identify a current sending branch, a current discharging path, a target sending branch and a target discharging path. A path switching sequence is formed according to the branch relationship, the current air exchange path is sequentially cut off, the multiple discharging paths enter a common closed intermediate air path stage, the target discharging path and the target sending branch are connected, and the target air exchange path is established. The target air treatment mode is executed along the path, and the target mode and the sending and discharging branches are updated to the current state. The application can reduce the short-time mismatch of the sending and discharging air caused by the response difference of different equipment and pipelines, and reduce the branch flow and the warehouse pressure fluctuation during switching.

Description

Technical Field

[0001] This application relates to the field of air conditioning and ventilation technology, and more specifically, to a method and system for air treatment in a low-temperature warehouse. Background Technology

[0002] Air handling in cryogenic warehouses refers to regulating the temperature, humidity, and air conditions inside the warehouse through air handling equipment, supply ducts, and exhaust ducts. Cryogenic materials such as plasma and biological products are highly sensitive to environmental conditions during storage. In addition to maintaining normal temperature and humidity, the air handling conditions may need to be adjusted based on equipment operating status, environmental changes, or emergency requirements. To adapt to different operating conditions, existing cryogenic warehouses typically have multiple sets of fans, valves, and air ducts, and the airflow pattern within the warehouse is altered by adjusting the operating status of related equipment.

[0003] Existing air handling systems typically send start / stop or open / close commands to fans and valves based on temperature, humidity, or external operating signals. Each device operates according to preset interlocking relationships, and some systems also determine whether a change in operating condition is complete through valve position signals or delay times. However, different air ducts have varying lengths, flow cross-sections, and resistances. The time required for the airflow within the duct to reach a stable state after the fan stops or starts also varies, and changes in valve position cannot directly reflect changes in the actual air supply and exhaust conditions inside the warehouse.

[0004] When existing systems need to switch between different air handling conditions, the transition process is typically improved by increasing delays, adjusting the action time of individual devices, or adding status feedback. However, these measures primarily target individual fans or valves and are insufficient to reflect the overall air condition of the warehouse under the combined action of multiple air ducts. Furthermore, when operating conditions change, existing settings may cause a temporary mismatch between air supply and exhaust volumes during the transition. Therefore, existing low-temperature warehouse air handling systems suffer from a technical problem where short-term mismatches in the supply and exhaust relationship can easily occur during condition transitions. Summary of the Invention

[0005] The main purpose of this application is to solve the technical problem that the supply and exhaust relationship of the existing low-temperature warehouse air handling system is prone to short-term mismatch during the transition between different operating conditions.

[0006] To address the aforementioned problems, this application proposes a method for air handling in a low-temperature warehouse, applicable to an air handling system for a low-temperature warehouse with multiple exhaust paths and multiple inlet branches. Each air handling mode is associated with at least one exhaust path and at least one inlet branch, comprising: Step S1: Obtain the current operating information of the low-temperature warehouse, determine the current air handling mode and the target air handling mode based on the current operating information, and determine the current inlet branch, the current outlet path, the target inlet branch and the target outlet path based on the pre-established mode supply and discharge correspondence table. Step S2: Form a path switching sequence based on the current feed branch, the current discharge path, the target feed branch, and the target discharge path; Step S3: Cut off the current air exchange path according to the path switching sequence to form an intermediate air path stage in which multiple exhaust paths are closed, and connect the target exhaust path and the target inlet branch through the intermediate air path stage to form the target air exchange path. Step S4: Execute the target air handling mode along the target air exchange path, and update the target air handling mode, target inlet branch, and target exhaust path to the current air handling mode, current inlet branch, and current exhaust path.

[0007] This application also discloses a low-temperature warehouse air handling system, comprising: A low-temperature warehouse is provided with an air terminal unit, a high-level air exhaust end is provided at the top of the low-temperature warehouse, and a first feed branch and a second feed branch are provided at the bottom of the low-temperature warehouse. A conversion box is connected to the high-level air exhaust end and is also connected to the first exhaust manifold, the second exhaust manifold, and the third exhaust manifold, respectively. A movable gate is installed inside a conversion box and has a flow window. A first outlet, a second outlet, and a third outlet are sequentially arranged on the conversion box along the moving direction of the movable gate. There is a solid plate surface without openings between two adjacent outlets. When the flow window is opposite to any outlet, the outlet is connected to the high-level air exhaust end. When the flow window is located between two adjacent outlets, the solid part of the movable gate blocks the first outlet, the second outlet, and the third outlet.

[0008] Beneficial effects: This application determines the current air handling mode and the target air handling mode based on the real-time operating status of the low-temperature warehouse, and identifies the current supply branch, the current exhaust path, the target supply branch, and the target exhaust path by combining the mode branch correspondence. This ensures that the air handling condition switching is based on the actual supply and exhaust paths connected to the warehouse, reducing branch switching errors that occur when the equipment status is inconsistent with the preset conditions. By organizing the current supply branch closure, the current exhaust path closure, the joint closure of all exhaust paths, the opening of the target exhaust path, and the opening of the target supply branch into a continuous path switching sequence, the originally dispersed fan and branch actions have a unified airflow conversion process, reducing the impact of different equipment response times and different pipeline airflow decay times on condition switching. In the intermediate air path stage, where all exhaust paths are closed between the current air exchange path and the target air exchange path, residual airflow in the original exhaust path is blocked from flowing into the target exhaust path, preventing cross-connection between the two air handling conditions during the transition. After the intermediate air path stage, the target exhaust path is established, and the target supply branch is connected when the target exhaust path has been established. This allows the air entering the low-temperature warehouse to flow along the established exhaust direction, reducing warehouse pressure changes and short-term imbalances in supply and exhaust volume caused by continuous air supply when the exhaust capacity has not yet been established. After the target air handling mode is completed, the current mode and the current supply and exhaust branch are updated so that subsequent condition transitions are based on the actual air exchange state that has been completed.

[0009] In summary, this application can improve the problem of short-term mismatch between air supply and exhaust caused by differences in the response of fans, valves and pipelines during the switching of different air handling conditions in existing low-temperature warehouses. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall steps of a low-temperature warehouse air treatment method according to this application; Figure 2 This is a schematic diagram of the overall structure of a low-temperature warehouse air handling system according to this application; Figure 3 This is a cross-sectional structural schematic diagram of a conversion box in a low-temperature warehouse air handling system according to this application; Figure 4 yes Figure 3 A schematic diagram showing the partial states of the movable gate in the conversion box when it is in different positions; Figure 5 This is an example curve showing the change of internal pressure in a low-temperature warehouse over time during the air treatment mode switching process of the air treatment method of this application.

[0011] The attached diagram is labeled as follows: 1. Low-temperature warehouse; 2. Public corridor; 3. Air terminal unit; 4. Equipment branch pipe; 5. Branch pipe section; 6. Branch pipe end; 7. Branch pipe connector; 8. Conversion box; 9. High-level air exhaust end; 10. First exhaust main pipe; 11. Second exhaust main pipe; 12. Third exhaust main pipe; 13. First feed branch; 14. Second feed branch; 15. Box body; 16. Movable gate; 17. Flow window; 18. First outlet; 19. Second outlet; 20. Third outlet; 21. Sealing seat; 22. Drive mechanism; 23. Fixed outlet plate; 24. Workstation detection piece.

[0012] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0014] Those skilled in the art will understand that, unless explicitly stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of this application means the presence of features, integers, steps, operations, elements, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and / or groups thereof. It should be understood that when an element is referred to as “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein may include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any modules and all combinations thereof of one or more associated listed items.

[0015] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0016] Reference Figure 1-4 This application provides a method for air treatment in a low-temperature warehouse, comprising the following steps: S1: Obtain the current operating information of the low-temperature warehouse, determine the current air handling mode and the target air handling mode based on the current operating information, and determine the current inlet branch, the current outlet path, the target inlet branch and the target outlet path based on the pre-established mode supply and discharge correspondence table; In step S1, the low-temperature warehouse air handling system pre-establishes an operational information collection range for each air handling area and obtains the internal status of the warehouse, the status of the air handling equipment, and the current on / off status of each branch according to a fixed collection cycle. The collection cycle can be set from 5 to 60 seconds, for example, 10 seconds, depending on the warehouse volume and the rate of change of air status. For continuously changing information such as temperature, humidity, pressure, or air volume, three to five cycles can be collected continuously, and multiple collected values ​​can be averaged to reduce the impact of fluctuations caused by equipment start-up and shutdown or warehouse door opening on mode judgment.

[0017] The current operational information is not limited to a single environmental parameter, but includes information reflecting the current air handling status of the cryogenic warehouse. This includes information such as currently operating air handling equipment, connected inlet branches, connected outlet paths, whether the temperature and humidity within the warehouse are within their respective operating ranges, whether external condition change signals have been received, and whether the previous air handling process has ended. After obtaining this information, the currently connected inlet branches and outlet paths are combined into a current branch combination, and this combination is compared with a pre-established mode-based inlet / outlet correspondence table. This mode-based inlet / outlet correspondence table can be established during the system commissioning phase. The table records the corresponding inlet branch number, outlet path number, operable air handling equipment, and the basic conditions required to enter that mode for each air handling mode. For example, mode A can be associated with inlet branch A1 and outlet path A2, mode B with inlet branch B1 and outlet path B2, and mode C with inlet branch C1 and outlet path C2. The mode dispatch correspondence table does not need to contain a complex calculation model. It can be stored in the form of a parameter table, a device correspondence table, or a preset logical relationship, as long as the corresponding mode can be found according to the currently connected branch combination.

[0018] When both an inlet branch and an outlet path are detected to be connected simultaneously, and the corresponding air handling unit is in operation, the mode corresponding to that branch combination is determined as the current air handling mode. When multiple branches have inconsistent states, such as an inlet branch being closed but the outlet path remaining connected, the previous stable operating mode can continue to be used as the current air handling mode. Simultaneously, the current state is marked as a transitional state during mode switching to avoid misjudging incomplete branch actions as a new stable mode. The target air handling mode is determined based on the correspondence between current operating information and preset operating conditions. Preset operating conditions may include upper temperature limits, upper humidity limits, air replacement requests, equipment malfunctions, external operating commands, and mode hold time. To avoid frequent mode switching caused by repeated changes in a parameter near a threshold, entry and exit thresholds can be set for parameters such as temperature and humidity. For example, entering the target mode is allowed when humidity reaches a preset upper limit, while exiting the target mode is only allowed after humidity drops below that upper limit by a certain range. A minimum mode hold time can also be set, such as maintaining a mode for at least three to ten minutes after activation, and not responding to non-urgent mode switching requests before the minimum hold time has elapsed.

[0019] When multiple target conditions exist simultaneously, mode priorities can be pre-set. For example, abnormal handling modes take precedence over environmental recovery modes, and environmental recovery modes take precedence over routine maintenance modes. A unique target air handling mode is then selected according to this priority. After the current air handling mode and the target air handling mode are determined, the system retrieves the corresponding feed branches and discharge paths from the mode feed-discharge correspondence table for the current mode and the target mode, respectively, thus obtaining the current feed branch, the current discharge path, the target feed branch, and the target discharge path. If the target mode is the same as the current mode, the current branch combination remains unchanged, and branch switching is not initiated. If the target mode is different from the current mode, the above four branch information items are used as the basic data for this mode conversion. Through this process, a set of mode information and branch information corresponding to the actual operating status of the low-temperature warehouse is formed, so that the objects processed by subsequent path switching are consistent with the air exchange paths currently actually connected to the warehouse.

[0020] S2: A path switching sequence is formed based on the current feed branch, the current discharge path, the target feed branch, and the target discharge path; In step S2, the current feed branch, current discharge path, target feed branch, and target discharge path determined in step S1 are received, and a set of path switching actions arranged in chronological order are formed based on the existing on / off relationships between these branches. When forming the path switching sequence, it is first confirmed whether the current feed branch and the target feed branch are the same branch, and whether the current discharge path and the target discharge path are the same branch. For the same branch, its current state can be retained or its flow state can be adjusted according to the operating requirements of the target mode. For different branches, the old branch closing action and the new branch opening action are included in the switching sequence.

[0021] In one specific setup, the path switching sequence includes at least five action nodes: current inlet branch closed, current outlet path closed, intermediate air path stage maintained, target outlet path opened, and target inlet branch opened. Each action node includes an action object, a target state, permissible execution conditions, and action completion conditions. For example, the action object of the current inlet branch closed node is the current inlet branch, the target state is closed, and the action completion conditions could be that the valve position of the branch reaches the closed position, the air volume through the branch drops below a set value, or the duration of its closed action reaches the rated closed time of the branch; the current outlet path closed node uses corresponding closed completion conditions; the intermediate air path stage maintained node requires that multiple outlet paths connected to the high-level air outlet of the low-temperature storage are all in a closed state; the target outlet path opened node requires that the intermediate air path stage has been established; and the target inlet branch opened node requires that the target outlet path has been connected.

[0022] The completion conditions for each action can be selected from one or more of the following, based on the system's equipment conditions: valve position signal, pressure difference, air volume value, equipment operation signal, or preset action time. It is not necessary to limit it to a specific detection device. For branches with valve position feedback, the fully closed and fully open positions can be used as the action completion conditions. For branches without valve position feedback, the action waiting time can be set based on the valve's rated action time, for example, by adding a 10% to 30% margin to the rated action time as the completion time for the corresponding action node. For systems with long ducts or large fan inertia, an airflow attenuation holding time can be set after the current discharge path is closed, allowing the residual airflow in the duct to decrease before executing the opening action of the target discharge path. This holding time can be determined through debugging, for example, by measuring the wind speed change at the high-level air discharge end after the current discharge equipment stops, and using the time required for the wind speed to decrease to a stable low value as the base holding time.

[0023] During the path switching sequence formation process, action conflict rules can also be set. When the target inlet branch is the same as the current inlet branch but the outlet path is different, the inlet branch can be temporarily closed and then reopened to avoid continuous air supply to the storage room during the outlet path transition. When the target outlet path is the same as the current outlet path but the inlet branch is different, the outlet path can be kept connected, and only the inlet branch can be switched. However, if the system requires a unified isolation process for each mode switch, the outlet path can also be included in the closure and reopening actions. To ensure that the actions between different storage room areas do not interfere with each other, a region identifier can be set for each air handling area in the mode supply and exhaust correspondence table. Step S2 only calls the branch associated with the target area to form a path switching sequence, while the other areas maintain their original operating status. When multiple low-temperature storage rooms simultaneously submit mode switching requests, independent path switching sequences can be formed according to region priority or time order, and it can be determined whether multiple sequences share the same main pipe or air handling equipment. If shared equipment exists, actions that may conflict will be staggered, or uniformly arranged within the capacity of the shared equipment. The path switching sequence output in step S2 organizes the execution order and execution conditions of each branch from the current state to the target state into a continuous process. The closing action of the current input branch is before the closing action of the current output path, the opening action of the target output path is before the opening action of the target input branch, and multiple action phases in which all output paths are closed are reserved between the closing of the current output path and the opening of the target output path.

[0024] S3: Cut off the current air exchange path according to the path switching sequence to form an intermediate air path stage in which multiple exhaust paths are closed, and connect the target exhaust path and the target inlet branch through the intermediate air path stage to form the target air exchange path. In step S3, the on / off states of each inlet branch and outlet path are sequentially changed according to the path switching sequence formed in step S2, and the original air exchange path of the low-temperature warehouse is converted into the target air exchange path. When the switching begins, the current air exchange path consists of the current inlet branch, the interior of the low-temperature warehouse, and the current outlet path. Air enters the warehouse from the current inlet branch, passes through the interior of the warehouse, and exits through the current outlet path. A closing action is issued to the current inlet branch according to the path switching sequence, stopping new air from entering the low-temperature warehouse. The closing of the current inlet branch is confirmed according to the corresponding action completion condition. When valve position is used as the completion condition, the next action begins after the valve reaches the fully closed position. When airflow is used as the completion condition, the next action begins after the airflow of the branch drops below the set airflow. When time is used as the completion condition, the next action begins after the closing action reaches the preset duration.

[0025] After the current feed branch is closed, the current discharge path is closed. The current discharge equipment can be synchronously stopped or maintained until the set time before the branch is closed, depending on the system settings. The specific timing can be determined by the connection method between the discharge equipment and the branch valves. When the current discharge path reaches the closed state, the current air exchange path is cut off. At this time, the system keeps other discharge paths closed, ensuring that the high-level air discharge end of the low-temperature warehouse is not connected to any discharge path, thus forming an intermediate air path stage. The intermediate air path stage is a short-term transition state between different stable air exchange paths, and its duration can be determined based on the branch action time, the residual airflow decay time, and the allowable pressure variation range of the warehouse.

[0026] In one implementation, the intermediate gas path stage remains stable at least until the current discharge path is closed, and the target discharge path remains closed. For systems with pressure detection, restoring the internal pressure of the storage room to a preset transition range can also be used as the end condition for the intermediate gas path stage. For systems without pressure detection, this can be determined by valve closure feedback and a preset holding time. After the intermediate gas path stage is formed, the system performs an opening action on the target discharge path and confirms that it has been connected according to the action completion conditions of the target discharge path.

[0027] Once the target discharge path is connected, the air exhaust equipment connected to the discharge path can be activated or the upstream passage of the discharge path can be opened, enabling the high-level air exhaust end of the low-temperature warehouse to have continuous air exhaust capability through the target discharge path. In one embodiment, after the target discharge path is connected, a discharge establishment time can be maintained, for example, 5 to 30 seconds, to allow a stable negative pressure or exhaust airflow to form within the target discharge path; alternatively, the establishment of the target discharge path can be determined by detecting the air volume, pressure difference, or operating status of the exhaust equipment within the discharge path.

[0028] After the target discharge path is established, the target inlet branch is opened to connect the target air source with the inlet of the cryogenic storage room. Air enters the storage room from the target inlet branch, passes through the interior of the cryogenic storage room, and is discharged through the already connected target discharge path, thus forming the target air exchange path. The opening amount of the target inlet branch can be set to an initial opening degree adapted to the target discharge capacity during system commissioning. For example, a smaller inlet amount can be used at the beginning of the target mode, and the inlet amount can be adjusted to the operating range corresponding to the target mode after the target discharge path is running stably. If the branch uses an on / off valve, the inlet amount can be determined by selecting a branch of the appropriate specification or adjusting the operating status of the inlet equipment. During step S3, if an action fails to meet the completion condition within a preset time, subsequent opening actions are stopped, keeping the unopened target branch closed and maintaining the system in the currently confirmed safe state. If the current inlet branch is closed but the current outlet path cannot be closed, the target outlet path is not activated. If all outlet paths are closed but the target outlet path cannot be opened, the target inlet branch is not activated, thus preventing continuous air input to the storage room before outlet capacity is established. After the above process, step S3 converts the path switching sequence in step S2 into actual branch actions, causing the original air exchange path to disappear, the intermediate air path stage to objectively exist, and after this stage, a target air exchange path composed of the target outlet path and the target inlet branch is formed.

[0029] S4: Execute the target air handling mode along the target air exchange path, and update the target air handling mode, target inlet branch and target outlet path to the current air handling mode, current inlet branch and current outlet path. In step S4, after the target air exchange path has been formed in step S3, the target air treatment mode is executed, and the current system state is updated after the mode reaches a stable operating state or completes the corresponding treatment task. The operating parameters of the target air treatment mode can be preset in a mode supply and exhaust correspondence table or an independent mode parameter table. Each mode corresponds to at least several items from the following: target supply equipment, target exhaust equipment, target supply volume range, target exhaust volume range, allowable temperature range, allowable humidity range, minimum operating time, maximum operating time, and termination conditions. For example, for a mode aimed at maintaining the warehouse environment, continuous or intermittent operation can be set, and the warehouse temperature and humidity can be maintained within the corresponding range as operating conditions; for a mode aimed at air replacement, the target operating time can be set according to the effective volume of the warehouse and the designed air exchange rate, and the target operating time can be obtained by dividing the effective volume by the actual exhaust air volume and multiplying by the preset replacement rate; for a mode aimed at reducing the moisture content of the warehouse air, the dew point range of the supply air, the target humidity range of the warehouse, and the termination condition of the exhaust air dew point can be set.

[0030] After the target air exchange path is established, the air handling equipment associated with the target inlet branch and the target outlet path is activated, and the inlet and outlet air volumes are gradually brought into the operating range specified by the target mode. To reduce airflow fluctuations at the moment of mode activation, a startup slope or graded operation state can be set for the inlet and outlet equipment. For example, the target outlet equipment can initially operate at 40% to 60% of its rated capacity, and after the target inlet branch is connected, the outlet and inlet capacities are gradually increased until the supply and exhaust state required by the target mode is reached. For systems using constant-speed equipment, the startup process can be adjusted by preset startup intervals, branch openings, or bypass methods.

[0031] During the target mode operation, the system continuously acquires the status of the low-temperature storage room and the branch circuit operation status, and determines whether the target air exchange path remains normal according to the preset monitoring cycle. If the target inlet branch circuit or the target outlet circuit is closed, the corresponding equipment stops, or the storage room status exceeds the allowable range of the target mode, the mode is marked as incomplete, and the actions associated with the abnormal path are stopped; if all branches and equipment remain in the target operating state, the target mode continues to be executed. The mode termination condition is determined according to the task of the target mode, which may be receiving an external termination command, reaching the preset running time, the storage room environmental parameters reaching the target range, the exhaust air status reaching the target value, or the related abnormal status being resolved.

[0032] When the target air handling mode reaches its termination condition, the system generates completion information for that mode and updates the target air handling mode determined in step S1 to the current air handling mode. Simultaneously, the target inlet branch is updated to the current inlet branch, and the target outlet path is updated to the current outlet path. This update process indicates that the system acknowledges the target mode as the current actual operating state of the cryogenic warehouse, rather than merely recording that the target mode was previously executed. In one specific implementation, the status update can be performed after the target air exchange path has been running stably for a preset confirmation time, such as maintaining stability for 30 to 180 seconds. This avoids updating the current state immediately after the target branch has just completed its opening action but before a stable airflow has been formed. For shorter-duration replacement modes, the update can be performed after the mode task is completed and the target branch state is stable. The updated current air handling mode, current inlet branch, and current outlet path are saved in the operating status record and used as reference information for the next acquisition of current operating information. When there are no new mode switching requests, the system continues to operate according to the updated current air handling mode or stops according to the termination rules of that mode; when a new target mode appears, the updated current mode and the current branch are used as the starting point for the next path switching.

[0033] In summary, the low-temperature warehouse has three sets of air input paths and three sets of air exhaust paths, with each air handling mode corresponding to one set of air input and exhaust paths. During system operation, the current air handling mode and the target air handling mode are determined based on the warehouse temperature and humidity, emergency operation status, and the on / off status of existing branches. The branches that need to be closed and opened are retrieved from the mode supply / exhaust correspondence table. When switching modes, the current supply branch and the current exhaust path are closed, disconnecting all exhaust paths from the high-level air exhaust end of the warehouse. After maintaining this intermediate air path state, the target exhaust path is connected, the corresponding air exhaust equipment is operated, and then the target supply branch is connected, allowing air to enter from the lower part of the warehouse, pass through the interior of the warehouse, and exit from the upper part. After the target mode operation ends, this mode and its supply / exhaust branches are set as the new current state. When switching to other modes, the same process is repeated to close existing paths, establish intermediate air path states, and connect new supply / exhaust paths, thus completing the continuous switching between multiple air handling modes in the low-temperature warehouse.

[0034] It is worth noting that the path switching in this application is not merely an independent start-stop sequence for multiple air supply and exhaust devices, but rather establishes a linkage between the opening and closing of the inlet branch and the specific position changes of the moving gate within the switching box. After the current inlet branch is closed, the moving gate moves from the current outlet position to the target outlet position. The flow window, after leaving the current outlet, passes through the solid plate area between adjacent outlets until it aligns with the target outlet. Only after the moving gate reaches the target position and confirms that the target discharge path has been established is the target inlet branch allowed to open. The switching of the discharge path is completed by the continuous displacement of the same moving gate, and the opening of the target inlet branch is constrained by the establishment status of the target discharge path. The above linkage can be confirmed using position signals, air volume signals, differential pressure signals, or equipment operation signals.

[0035] In another embodiment, reference Figure 5The horizontal axis represents time, and the vertical axis represents the internal pressure of the cryogenic storage room. t0 to t1 represents the stable operation phase of the current air handling mode; t1 to t2 represents the current air exchange path closure phase; t2 to t3 represents the intermediate air path phase where multiple exhaust paths are closed; t3 to t4 represents the target air exchange path establishment phase; and t4 onwards represents the stable operation phase of the target air handling mode. During t0 to t1, the current inlet branch and the current exhaust path remain connected, and the inlet and outlet air volumes inside the cryogenic storage room are relatively stable, thus maintaining the storage room pressure within the first stable pressure range. Upon reaching t1, the system closes the current inlet branch according to the path switching sequence, and the storage room no longer receives air corresponding to the current mode, while the current exhaust path remains closed. Because the original airflow within the branch still undergoes a decay process, the storage room pressure gradually changes from the first stable pressure to a transitional pressure during t1 to t2. Upon reaching t2, the current discharge path is closed, while the target discharge path and target inlet branch remain closed. All discharge paths are disconnected from the high-level air discharge end, and the system enters the intermediate gas path stage. The warehouse pressure remains in a relatively smooth transition range between t2 and t3. Upon reaching t3, the target discharge path is connected, and the target air discharge path begins to be established. Air from the warehouse enters the target discharge path via the high-level air discharge end. After the target inlet branch is connected, the target air enters from the lower part of the warehouse, gradually bringing the warehouse inlet and outlet volumes to a balance corresponding to the target air handling mode. Therefore, the warehouse pressure gradually recovers between t3 and t4. Upon reaching t4, the target inlet branch and target discharge path remain stably connected, and the warehouse pressure enters the second stable pressure range. Figure 5 The pressure change curve in the figure is an example. The specific pressure values ​​and the duration of each stage can be set according to the warehouse volume, branch resistance, air supply and exhaust volume and equipment response time, and do not constitute a limitation on the scope of protection of this application.

[0036] In one embodiment, before the low-temperature warehouse is put into operation, a mode supply and exhaust correspondence table is established based on the existing supply, return, and exhaust ducts of the warehouse. The supply air interface of the air handling unit is used as the input path for treated air and associated with the first exhaust path to establish a first air handling mode; the output interface of the outdoor makeup air device is used as the input path for external air and associated with the second exhaust path to establish a second air handling mode; the output interface of the dehumidifier is used as the input path for low dew point air and associated with the third exhaust path to establish a third air handling mode. The commissioning personnel record the corresponding supply branch number, exhaust path number, and the order of closing and opening for each mode, and write these records into the mode supply and exhaust correspondence table according to the warehouse number. For example, the first area is associated with branches A1, A2, and A3, and the second area is associated with branches B1, B2, and B3, allowing different areas to call their respective branch combinations, avoiding mode confusion when adjacent warehouses share branches. It should be noted that the first, second, and third exhaust paths in this embodiment are selective air exhaust paths formed for a single low-temperature warehouse 1. Specifically, when the switching box connects the high-level air exhaust end to the first exhaust manifold via the first outlet, a first exhaust path is formed; when the switching box connects the high-level air exhaust end to the second exhaust manifold via the second outlet, a second exhaust path is formed; and when the switching box connects the high-level air exhaust end to the third exhaust manifold via the third outlet, a third exhaust path is formed. The first, second, and third exhaust manifolds are maintained as common exhaust pipelines arranged along a common corridor. Each low-temperature warehouse changes the connection relationship between its high-level air exhaust end and different exhaust manifolds through the corresponding switching box, thereby realizing the switching between the first, second, and third exhaust paths.

[0037] In one embodiment, the temperature, humidity, emergency operation signal, air replacement request, valve position status of each inlet branch and each outlet path, and completion status of the previous mode in the low-temperature storage room are acquired according to a preset acquisition cycle. The acquisition cycle can be set to 5 seconds to 30 seconds. Inlet branches and outlet paths with open valves are combined into a current branch combination, and compared with each mode combination in the mode supply / discharge correspondence table to determine the current air handling mode. The temperature and humidity information, emergency operation signal, and air replacement request are compared with preset operating conditions. For example, a second air handling mode is determined when an emergency operation signal is present; a third air handling mode is determined when the air humidity exceeds the replacement condition and the emergency process ends; and a first air handling mode is determined for other normal storage conditions. The current branch and target branch involved in this switch are obtained by querying the mode supply / discharge correspondence table based on the current mode and target mode.

[0038] In one embodiment, the branch action sequence is arranged according to the current feed branch, current discharge path, target feed branch, and target discharge path obtained in step S1. The system sets the closing action of the current feed branch as the first action, the closing action of the current discharge path as the second action, keeping all discharge paths closed as the third action, the opening action of the target discharge path as the fourth action, and the opening action of the target feed branch as the fifth action, thereby forming a path switching sequence. Each action is set with corresponding completion conditions. When the damper has position feedback, a fully open or fully closed signal is used as the completion condition; when there is no position feedback, the rated action time plus a reserved time is used as the completion condition. The intermediate closing action can be maintained for 5 to 30 seconds, and the specific time is determined according to the discharge pipe length, fan inertia, and airflow attenuation time. The next action is executed after the previous action meets the completion condition; the subsequent opening action is stopped if the completion condition is not met.

[0039] In one embodiment, the first air handling mode serves as the daily operating mode for the low-temperature warehouse. The system closes the second exhaust path, the third exhaust path, the external air input path, and the low dew point air input path, and connects the first exhaust path, connecting the high-level air exhaust end to the return air interface of the air handling unit. The air input path of the air handling unit is opened, and cooled and dehumidified air is delivered into the low-temperature warehouse through the warehouse's air outlet. Simultaneously, the return air device of the air handling unit operates, drawing air from the warehouse through the high-level air exhaust end and returning it to the air handling unit via the first exhaust path. The air handling unit reprocesses the returned air before re-delivering it into the warehouse. During the operation of the first air handling mode, the operating level of the air handling unit can be adjusted according to the warehouse temperature and humidity. Unless a mode switching request is received, the processed air input path and the first exhaust path remain connected.

[0040] In one embodiment, when the low-temperature warehouse switches from a first air handling mode to a second air handling mode, the air input path processed by the air handling equipment is closed according to the path switching sequence, causing the air handling equipment to stop supplying air to the warehouse. After confirming that the input path is closed, the first exhaust path is closed, while the second and third exhaust paths remain closed, so that the high-level air exhaust end is temporarily not connected to any exhaust path, forming a first intermediate air path stage. The first intermediate air path stage can be maintained until the first exhaust path reaches the fully closed position, or for a preset airflow attenuation time. After the intermediate air path stage is completed, the second exhaust path is connected, so that the high-level air exhaust end is connected to the second exhaust path, and the corresponding exhaust equipment is operated. When the second exhaust path reaches the set ventilation state, the external air input path is opened, and external air is supplied from the lower part of the warehouse, establishing a second air exchange path.

[0041] In one embodiment, the second air handling mode can be executed when the low-temperature warehouse receives an emergency operation signal. The system operates the air exhaust device connected to the second exhaust path, drawing air from the upper part of the warehouse through the high-level air exhaust end and sending it into the second exhaust path, while the valve of the second exhaust path remains open. After confirming that air has been discharged through the second exhaust path, the external air input path is opened, and outdoor air is introduced through the make-up air vent located at the bottom of the warehouse; the air input path after being processed by the air handling equipment and the low dew point air input path remain closed. The outside air enters from the bottom of the warehouse, flows upward inside the warehouse, and is discharged through the high-level air exhaust end. After the system receives the emergency operation end signal or reaches the preset operating time, it closes the external air input path, stops the corresponding air exhaust device, and closes the second exhaust path, while recording the completion status of the second air handling mode.

[0042] In one embodiment, when the second air handling mode is completed and the warehouse still requires air replacement, the second air handling mode is switched to the third air handling mode. The system closes the external air input path, stops external air from entering the low-temperature warehouse, and disconnects the connection between the second exhaust path and the high-level air exhaust end; the first and third exhaust paths remain closed during this process, so that all three exhaust paths are disconnected from the high-level air exhaust end, forming a second intermediate air path stage. The second intermediate air path stage is maintained until the second exhaust path reaches the closed position and its internal airflow decays. The third exhaust path is connected and its corresponding air exhaust device is operated, so that the high-level air exhaust end is connected to the third exhaust path; after confirming that the third exhaust path is established, the low dew point air input path is opened, and the dehumidified low dew point air is sent into the lower part of the warehouse, forming a third air exchange path.

[0043] In one embodiment, the third air handling mode is used to replace and dehumidify the air in the low-temperature warehouse. An air exhaust device connected to the third exhaust path is operated, drawing air from the upper part of the warehouse through the high-level air exhaust end; a low dew point air input path is opened, supplying air with a dew point lower than that of the air inside the warehouse from the lower part of the warehouse. The low dew point air flows from low to high level, carrying the air with higher moisture content in the warehouse to the high-level air exhaust end. The system continuously records the air replacement time and obtains the warehouse humidity and the air dew point in the third exhaust path. The preset replacement time can be determined based on the effective volume of the warehouse and the designed air exchange rate, while the humidity and dew point conditions can be set according to the requirements of the stored materials. When any one of the following conditions is met: the operating time reaches the preset replacement time, the warehouse humidity reaches the preset range, or the exhaust air dew point reaches the set conditions, the low dew point air input path and the third exhaust path are closed, and the exhaust device is stopped.

[0044] In one embodiment, a collection surface inclined towards the collection tank is provided at the bottom of the branch junction area. Condensate generated during the switching of each discharge path enters the collection tank along the collection surface and is discharged through the drain pipe. The system can determine whether water has accumulated in the collection tank through a conventional level switch, or whether the switching is obstructed based on the action time of the branch switching component, the drive current, or the valve position status. When the switching time exceeds the preset time, the branch has not reached the closed position, or the liquid level in the collection tank exceeds the set position, the current feeding and discharging equipment is stopped, and each discharge path is kept in the closed state. Maintenance personnel fix the branch switching component with positioning pins, open the maintenance door, and clean the sealing parts, guide parts, and collection tank. After cleaning, the positioning is released, and the branch switching is restored according to the current mode, target mode, and incomplete action position saved before the abnormality occurred.

[0045] In one embodiment, such as Figure 2-4 As shown, this application also discloses a low-temperature warehouse air handling system applied to the aforementioned low-temperature warehouse air handling method. The system includes a low-temperature warehouse 1, an air terminal unit 3, an elevated air exhaust terminal 9, a first inlet branch 13, a second inlet branch 14, and a conversion box 8 located outside the low-temperature warehouse 1. The low-temperature warehouse 1 can be a storage space for plasma, biological products, or other low-temperature materials. The air terminal unit 3 is located in the upper part of the low-temperature warehouse 1 and communicates with the interior of the warehouse, thereby cooling, dehumidifying, or circulating the air inside the warehouse. The elevated air exhaust terminal 9 is located in the upper part of the low-temperature warehouse 1. It can be installed on the side wall of the warehouse near the top plate or below the top plate, thereby collecting air from the upper part of the warehouse. The first inlet branch 13 and the second inlet branch 14 are respectively located in the lower part of the low-temperature warehouse 1. The two inlet branches adopt independent pipeline structures, allowing air from different sources to enter the warehouse from the lower level. The conversion box 8 is located between the low-temperature storage room 1 and the external pipeline area. Its air inlet side is connected to the high-level air exhaust end 9, and its exhaust side is connected to the first exhaust manifold 10, the second exhaust manifold 11 and the third exhaust manifold 12 respectively. The three exhaust manifolds can be arranged in parallel along the public corridor 2 and connected to the corresponding air handling equipment, air exhaust equipment or other downstream pipelines respectively.

[0046] The conversion box 8 is equipped with a movable gate 16, which is a plate-shaped component with a continuous solid plate surface and a flow window 17 is opened on the plate surface. A first outlet 18, a second outlet 19 and a third outlet 20 are arranged sequentially on one side of the conversion box 8 along the moving direction of the movable gate 16. The centers of the three outlets can be located on the same straight line and are respectively connected to three discharge main pipes. When the movable gate 16 moves to the first station, the flow window 17 is opposite to the first outlet 18. The air from the high-level air exhaust end 9 enters the conversion box 8 through the flow window 17 and the first outlet 18 and enters the first exhaust manifold 10. At the same time, the second outlet 19 and the third outlet 20 are blocked by the solid part of the movable gate 16. When the movable gate 16 moves to the second station, the flow window 17 is opposite to the second outlet 19, and the air enters the second exhaust manifold 11. The first outlet 18 and the third outlet 20 are blocked. When the movable gate 16 moves to the third station, the flow window 17 is opposite to the third outlet 20, and the air enters the third exhaust manifold 12. The first outlet 18 and the second outlet 19 are blocked.

[0047] Solid plate areas without openings are reserved between the first outlet 18 and the second outlet 19, and between the second outlet 19 and the third outlet 20. The size of the solid plate areas along the moving direction can be no less than the size of the flow window 17 along the same direction. Therefore, when the moving gate 16 moves from one outlet to an adjacent outlet, the flow window 17 can completely enter the area between the adjacent outlets without coinciding with any of the three outlets. At this time, the solid part of the moving gate 16 simultaneously blocks the first outlet 18, the second outlet 19, and the third outlet 20. The conversion box 8 forms two transition positions with all outlets closed between the three stable connected stations, allowing the same high-level air exhaust end 9 to selectively connect to the three exhaust manifolds, and preventing the flow window 17 from simultaneously bridging two adjacent outlets during branch conversion.

[0048] like Figure 4 As shown, the conversion box 8 includes a box body 15 and a fixed outlet plate 23. The box body 15 can be formed by enclosing a metal sheet or a low-temperature resistant composite sheet. The fixed outlet plate 23 is installed on the side of the box body 15 near the first discharge main pipe 10, the second discharge main pipe 11, and the third discharge main pipe 12. The first outlet 18, the second outlet 19, and the third outlet 20 are sequentially opened on the fixed outlet plate 23 along the moving direction of the moving gate 16. A sealing seat 21 is provided around the periphery of each outlet. The sealing seat 21 can be made of a closed-cell elastic material, a low-temperature resistant rubber strip, or other sealing material with elastic recovery capability, and protrudes from the side of the fixed outlet plate 23 toward the moving gate 16, so that when the moving gate 16 reaches the corresponding work position, the solid surface of the moving gate 16 can contact the sealing seat 21 around the periphery of the unselected outlet.

[0049] The movable gate 16 is positioned close to the fixed outlet plate 23, with a clearance between the movable gate 16 and the fixed outlet plate 23 allowing for reciprocating movement. This clearance is smaller than the allowable clearance that would affect the outlet isolation effect. The drive mechanism 22 is located on the upper part or outer side of the housing 15. The output end of the drive mechanism 22 is connected to the movable gate 16, driving it to reciprocate along the arrangement direction of the three outlets. The drive mechanism 22 can be an existing electric actuator, linear actuator, pneumatic actuator, or other drive device capable of providing linear displacement; its internal transmission form is not limited. The stroke of the movable gate 16 is determined based on the center distance between the first outlet 18, the second outlet 19, and the third outlet 20, allowing the flow window 17 to stop at the corresponding positions of the three outlets and at the closed position between two adjacent outlets.

[0050] At least two station detection elements 24 are provided on the housing 15. These detection elements 24 can be limit switches, proximity switches, or magnetic switches, and are respectively located at both ends of the travel distance of the moving gate 16. When the moving gate 16 moves to the end position corresponding to the first outlet 18 or the end position corresponding to the third outlet 20, the corresponding station detection element 24 outputs positioning information. In a preferred embodiment, an additional station detection element 24 can be added at the position corresponding to the second outlet 19, thereby detecting three stable stations respectively. The station detection elements 24 can be connected to a conventional relay circuit or PLC input terminal. The drive mechanism 22 stops operating according to the positioning information, and the fan or corresponding branch equipment starts and stops according to the station information. Therefore, this structure can be implemented through ordinary position detection and sequential control, without requiring image recognition, machine learning models, or complex computational algorithms.

[0051] like Figure 2 As shown, multiple low-temperature storage rooms 1 are arranged along one side of a public corridor 2. The first discharge main pipe 10, the second discharge main pipe 11, and the third discharge main pipe 12 are arranged parallel to each other along the length of the public corridor 2. The conversion box 8 corresponding to each low-temperature storage room 1 is installed between the low-temperature storage room 1 and the public corridor 2, so that one side of the conversion box 8 is connected to the high-level air exhaust end 9 at the top of the low-temperature storage room 1, and the other side is connected to the three discharge main pipes respectively. The air terminal unit 3 in the low-temperature storage room 1 is connected to the high-level air exhaust end 9 through the equipment branch pipe 4. The equipment branch pipe 4 can be set vertically, and branch pipe connectors 7 are set at different heights. The branch pipe connectors 7 can be tee joints, four-way joints, or box-type connection nodes. The branch pipe section 5 is connected to the equipment branch pipe 4 through the branch pipe connectors 7. The branch pipe section 5 extends horizontally along the interior of the storage room, and its end forms a branch pipe end 6. The branch pipe end 6 can be connected to the air collection port, the air outlet connector, or the closed end.

[0052] Multiple branch pipe sections 5 can be distributed on both sides of the air terminal unit 3, thereby converging air from different areas into the equipment branch pipe 4 and delivering it to the high-level air exhaust end 9 via the equipment branch pipe 4. The first supply branch 13 is connected to an external air source, which can be an outdoor make-up fan, a filtered outdoor air duct, or other external air supply device; the second supply branch 14 is connected to a low dew point air source, which can be a rotary dehumidifier, a refrigeration dehumidifier, or other air handling equipment capable of outputting air with low moisture content. The first supply branch 13 and the second supply branch 14 are laid along the public corridor 2 and extend from the public corridor 2 to the lower part of the low-temperature warehouse 1, respectively. The two branches are separated from each other and each is equipped with an independent on / off component. When the first feed branch 13 is opened, outside air enters from the lower part of the low-temperature warehouse 1 and flows along the inside of the warehouse to the high-level air discharge end 9; when the second feed branch 14 is opened, low dew point air enters the warehouse from the lower level and carries the air with higher moisture content in the warehouse to the high-level air discharge end 9.

[0053] The conversion box 8 selects the first discharge main duct 10, the second discharge main duct 11, or the third discharge main duct 12 according to the current air handling mode, so that the selected feed branch and the corresponding discharge main duct together form an air exchange path; other low-temperature warehouses 1 can continue to maintain their original operating status, and each conversion box 8 completes the selection of the discharge path of its own warehouse, thus making it suitable for engineering scenarios where multiple low-temperature warehouses are centrally arranged along a public corridor.

[0054] In one specific embodiment, such as Figure 2 As shown in the figure, this embodiment uses four adjacent low-temperature warehouses 1 as an example. Each low-temperature warehouse 1 is equipped with an air terminal unit 3, and is also equipped with equipment branch pipes 4, high-level air exhaust terminals 9, and conversion boxes 8. Therefore, the figure shows four air terminal units 3, four sets of equipment branch pipes 4, four high-level air exhaust terminals 9, and four conversion boxes 8. The above quantities mainly correspond to the four independent air handling areas in the original engineering drawing, which are used to illustrate that multiple low-temperature warehouses can perform air handling and branch switching separately. This does not mean that this application must set up four low-temperature warehouses or four air terminal units 3. In actual implementation, one or more sets of air terminal units 3 can be set up according to the number of warehouses, warehouse volume, and design air volume. One low-temperature warehouse 1 can be equipped with one air terminal unit 3, or two or more air terminal units 3. Multiple air terminal units 3 can also be connected to the high-level air exhaust terminal 9 corresponding to the low-temperature warehouse 1.

[0055] Each air terminal unit 3 is connected to a branch pipe 4 because each low-temperature warehouse 1 is a relatively independent air handling area. The branch pipe 4 collects the air from its corresponding area and delivers the collected air to the corresponding high-level air exhaust end 9. One or more branch pipe sections 5 can be connected to the branch pipe 4. The branch pipe sections 5 are connected to the branch pipe 4 through branch pipe connectors 7, and the ends of the branch pipe sections 5 form branch pipe ends 6. The branch pipe sections 5, branch pipe ends 6, and branch pipe connectors 7 mainly represent the distribution of air branches inside the warehouse in the original engineering drawing. The branch pipe connectors 7 can be tees, crosses, or junction boxes, and the branch pipe ends 6 can be air collection ports, air vent connections, or closed ends. The number and position of the branch pipe sections 5 in the figure are schematic representations and can be increased, decreased, or adjusted according to the shape of the warehouse, the installation position of the air terminal units 3, and air organization requirements. This does not constitute a limitation on the scope of protection of this application.

[0056] The high-level air exhaust end 9 is located at the upper part of the low-temperature warehouse 1 because the warehouse air collected by the air terminal unit 3 and equipment branch pipe 4 needs to enter the conversion box 8 through a relatively centralized interface. The first inlet branch 13 and the second inlet branch 14 are located at the lower part of the low-temperature warehouse 1. After the air enters the warehouse from the lower level, it passes through the interior of the warehouse and is then discharged from the high-level air exhaust end 9, thus allowing the supplied air to pass through the main storage area of ​​the warehouse. The first inlet branch 13 and the second inlet branch 14 are connected to different air sources. The first inlet branch 13 can be connected to an external air source, and the second inlet branch 14 can be connected to a low dew point air source. Only two additional inlet branches are shown in the figure because the air supply path of the first air handling mode is constituted by the air terminal unit 3, while the second and third air handling modes are constituted by the first inlet branch 13 and the second inlet branch 14, respectively. Therefore, the three air handling modes correspond to three air supply paths, but one of them is provided by the existing air terminal unit 3, so there is no need to draw a third inlet branch.

[0057] The first discharge main duct 10, the second discharge main duct 11, and the third discharge main duct 12 are arranged along the common corridor 2 and connected to the corresponding conversion boxes 8 of each cryogenic storage room 1. The common corridor 2 is a common pipeline space outside multiple cryogenic storage rooms 1. By centrally setting up the three discharge main ducts in the common corridor 2, multiple cryogenic storage rooms 1 can be connected to the same type of common main duct, while retaining the ability of each cryogenic storage room 1 to independently choose its discharge path. In the figure, each cryogenic storage room 1 is equipped with a corresponding conversion box 8. Therefore, when a cryogenic storage room 1 switches to the second discharge main duct 11, other cryogenic storage rooms 1 can still maintain communication with the first discharge main duct 10 or the third discharge main duct 12. The number of the three discharge main ducts corresponds to the three air handling modes, but the number of cryogenic storage rooms 1 and conversion boxes 8 can vary according to the scale of the project.

[0058] Figure 3 The internal structure of the conversion box 8 is shown. The conversion box 8 includes a box body 15, a movable gate 16, a flow window 17, a first outlet 18, a second outlet 19, a third outlet 20, a sealing seat 21, a drive mechanism 22, a fixed outlet plate 23, and a station detection component 24. The first outlet 18, second outlet 19, and third outlet 20 are respectively connected to the first discharge main pipe 10, the second discharge main pipe 11, and the third discharge main pipe 12. A flow window 17 is provided on the movable gate 16. The drive mechanism 22 moves the movable gate 16 so that the flow window 17 is opposite to one of the three outlets. The sealing seat 21 is located on the side of the fixed outlet plate 23 facing the movable gate 16 and is arranged around the periphery of the opening of each outlet. The solid surface of the movable gate 16 contacts the sealing seat 21 around the periphery of the unselected outlet, thereby closing the unselected outlet. The sealing seat 21 adopts the same structure around the three outlets; one or two typical positions are indicated in the attached drawing.

[0059] like Figure 4 As shown, in Figure 3 Based on the structure of the conversion box 8 shown, the relative positional relationship between the flow window 17 and the first outlet 18, the second outlet 19, and the third outlet 20 when the moving gate 16 is in different stable positions is further illustrated. When the moving gate 16 is in the first position, the flow window 17 is opposite to the first outlet 18, and the high-level air exhaust end 9 is connected to the first exhaust manifold 10; when the moving gate 16 is in the second position, the flow window 17 is opposite to the second outlet 19, and the high-level air exhaust end 9 is connected to the second exhaust manifold 11; when the moving gate 16 is in the third position, the flow window 17 is opposite to the third outlet 20, and the high-level air exhaust end 9 is connected to the third exhaust manifold 12. There are solid plate areas without openings between the first outlet 18 and the second outlet 19, and between the second outlet 19 and the third outlet 20. When the moving gate 16 moves from one stable position to another, the flow window 17 passes through the solid plate areas, at which time all three outlets are blocked by the moving gate 16. It should be noted that this application... Figure 4 Is Figure 3 Based on the structure of the conversion box 8 shown, the partial structures related to the switching of the moving gate 16 are schematically represented. To facilitate explanation of the relative positional relationships between the moving gate 16, the flow window 17, and the first outlet 18, the second outlet 19, and the third outlet 20 at different positions, Figure 4 Omitted Figure 3 The structural components not directly related to the workstation switching status are shown; only the moving gate 16, the flow window 17, and the relative positions of each outlet are illustrated. Therefore, Figure 4 It does not mean that it is related to Figure 3 The different conversion box structures are used for further explanation. Figure 3The conversion box 8 is shown in the local working state at different workstations.

[0060] The station detection element 24 mainly detects whether the moving gate 16 has reached the corresponding station. In the figure, one station detection element 24 can be set at each of the two ends of the travel stroke, corresponding to the end stations of the first exit 18 and the third exit 20 respectively. The intermediate second station can be determined according to the set travel stroke of the drive mechanism 22; alternatively, another station detection element 24 can be added at the corresponding position of the second exit 19. This application does not limit the specific number of station detection elements 24, as long as it can confirm that the moving gate 16 is in the required stable station position.

[0061] like Figure 3 and Figure 4 As shown, the first, second, and third stations are three stable positions formed when the movable gate 16 moves along the fixed outlet plate 23. When the movable gate 16 is in the first station, the flow window 17 is opposite to the first outlet 18, and the high-level air exhaust end 9 is connected to the first exhaust manifold 10. This station corresponds to the first air handling mode consisting of the air input path and the first exhaust path after being processed by the air handling equipment. When the movable gate 16 is in the second station, the flow window 17 is opposite to the second outlet 19, and the high-level air exhaust end 9 is connected to the second exhaust manifold 11. This station corresponds to the second air handling mode consisting of the first feed branch 13 and the second exhaust path. When the movable gate 16 is in the third station, the flow window 17 is opposite to the third outlet 20, and the high-level air exhaust end 9 is connected to the third exhaust manifold 12. This station corresponds to the third air handling mode consisting of the second feed branch 14 and the third exhaust path. The drive mechanism 22 drives the movable gate 16 to move in a straight line along the arrangement direction of the three outlets. The flow window 17 passes through the three outlets in sequence with the movable gate 16. There is a solid plate area without holes between adjacent outlets. When the flow window 17 is located in the solid plate area, it does not coincide with any outlet. The solid part of the movable gate 16 blocks the three outlets, thereby forming a transition state in which all discharge paths are closed between two adjacent stable stations.

[0062] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for air handling in a low-temperature warehouse, applied to a low-temperature warehouse air handling system having multiple exhaust paths and multiple inlet branches, wherein each air handling mode is associated with at least one exhaust path and at least one inlet branch, characterized in that, The multiple discharge paths are selectively connected to the high-level air discharge end of the low-temperature storage room through the same conversion box. The conversion box is equipped with a movable gate with a flow window, and multiple outlets are sequentially arranged along the moving direction of the movable gate. The method includes: S1: Obtain the current operating information of the low-temperature warehouse, determine the current air handling mode and the target air handling mode based on the current operating information, and determine the current inlet branch, the current outlet path, the target inlet branch and the target outlet path based on the pre-established mode supply and discharge correspondence table; S2: A path switching sequence is formed based on the current feed branch, the current discharge path, the target feed branch, and the target discharge path; S3: Cut off the current air exchange path according to the path switching sequence to form an intermediate air path stage in which multiple exhaust paths are closed, and connect the target exhaust path and the target inlet branch through the intermediate air path stage to form the target air exchange path. S4: Execute the target air processing mode along the target air exchange path, and update the target air processing mode, target inlet branch and target exhaust path to the current air processing mode, current inlet branch and current exhaust path.

2. The air treatment method for a low-temperature warehouse according to claim 1, characterized in that, Before obtaining the current running information, the process also includes: The air input path after being processed by the air handling equipment is combined with the first exhaust path to establish a first air handling mode; The external air input path is combined with the second exhaust path to establish a second air handling mode; The low dew point air input path is combined with the third exhaust path to establish a third air handling mode; Determine the corresponding supply branch, discharge path and branch opening and closing sequence for the first air handling mode, the second air handling mode and the third air handling mode, and form a mode supply and discharge correspondence table. Based on the inlet and outlet ports of each air handling area in the low-temperature warehouse, each air handling area is associated with the inlet branch, outlet path, and branch opening and closing sequence in the mode supply and exhaust correspondence table.

3. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, The steps of determining the current air handling mode and the target air handling mode include: Acquire temperature information, humidity information, emergency operation information, air replacement requests, on / off information of each inlet branch and each outlet path of the low-temperature warehouse, as well as completion information of the previous air handling mode, to form the current operation information set; The on / off information of each feed branch and each discharge path in the current operation information set is matched with the mode feed and discharge correspondence table, and the current air handling mode is determined according to the feed branch and discharge path that are in the on state. The current operating information set is matched with the operating conditions corresponding to each air handling mode to determine the target air handling mode; Based on the current air handling mode and the target air handling mode, the corresponding mode supply and exhaust table is queried to form target branch information, which includes the current supply branch, the current exhaust path, the target supply branch, and the target exhaust path.

4. The air treatment method for a low-temperature warehouse according to claim 3, characterized in that, The step of forming the path switching sequence includes: Arrange the closing action of the currently fed branch before the moving gate leaves the corresponding outlet of the current discharge path; The movement of the movable gate from the outlet corresponding to the current discharge path to the outlet corresponding to the target discharge path is regarded as the discharge path switching action; The action of sending the target into the branch is scheduled after the target discharge path is established and confirmed; The establishment and confirmation of the target discharge path is achieved by using at least one of the following: the station signal of the moving gate reaching the corresponding station of the target outlet, the air volume signal or the differential pressure signal within the target discharge path.

5. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, The upper part of the low-temperature warehouse is equipped with a high-level air exhaust end. When the target air handling mode is the first air handling mode, step S4 includes: Keep the second discharge path, the third discharge path, and their corresponding feed branches closed; Connect the first discharge path to connect the high-level air discharge end of the low-temperature warehouse to the air handling equipment; Open the air input path after it has been treated by the air handling equipment and send the treated air into the low-temperature storage room; The air handling equipment is operated to draw air from the low-temperature warehouse through the high-level air exhaust end and deliver the drawn air to the air handling equipment through the first exhaust path. In the absence of a mode switching request, the processed air input path and the first exhaust path remain connected, and the first air handling mode is maintained as the current air handling mode.

6. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, When the current air handling mode is the first air handling mode and the target air handling mode is the second air handling mode, step S3 includes: Close the air input path after it has been processed by the air handling equipment, close the first discharge path, and keep the second and third discharge paths closed, so that each discharge path is disconnected from the high-level air discharge end of the low-temperature warehouse, forming the first intermediate air path stage. Connect the second discharge path and establish a second discharge path from the high-level air discharge end to the second discharge path; With the second exhaust path still connected, the external air input path is opened to connect the lower part of the low-temperature warehouse to the external air source, forming a second air exchange path consisting of the external air input path, the interior of the low-temperature warehouse, and the second exhaust path.

7. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, When the target air handling mode is the second air handling mode, step S4 includes: The air exhaust device connected to the second exhaust path is operated to extract air from the upper part of the low-temperature warehouse through the high-level air exhaust end and deliver the extracted air to the second exhaust path. While maintaining the exhaust airflow in the second exhaust path, the external air input path is opened to send external air in from the bottom of the low-temperature storage room; Close the air inlet path after air handling equipment treatment and the low dew point air inlet path, and keep the external air inlet path and the second exhaust path connected; When the second air handling mode reaches the corresponding termination condition, the external air input path is closed, the air discharge from the second discharge path is stopped and the second discharge path is closed, thus generating completion information for the second air handling mode.

8. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, When the current air handling mode is the second air handling mode and the target air handling mode is the third air handling mode, step S3 includes: Close the external air input path, disconnect the connection between the second exhaust path and the high-level air exhaust end, and keep the first and third exhaust paths closed, so that each exhaust path is disconnected from the high-level air exhaust end, forming the second intermediate air path stage. Connect the third discharge path and establish a third discharge path from the high-level air discharge end to the third discharge path; With the third discharge path connected, the low dew point air input path is opened to connect the lower part of the low-temperature warehouse to the low dew point air source, forming a third air exchange path consisting of the low dew point air input path, the interior of the low-temperature warehouse, and the third discharge path.

9. The air treatment method for a low-temperature warehouse according to claim 2, characterized in that, When the target air handling mode is the third air handling mode, step S4 includes: The air exhaust equipment connected to the third exhaust path delivers low dew point air into the lower part of the low-temperature warehouse via the low dew point air input path, and extracts air from the upper part of the low-temperature warehouse via the high-level air exhaust end. Keep the low dew point air input path and the third exhaust path connected, and monitor the air replacement time, the humidity of the low-temperature warehouse and the air dew point in the third exhaust path. When at least one of the following conditions is met—air replacement time, low-temperature warehouse humidity, or air dew point in the third discharge path—the low dew point air input path is closed, air discharge from the third discharge path is stopped, and the third discharge path is shut down, thus generating completion information for the third air handling mode.

10. A low-temperature warehouse air handling system, characterized in that, include: Low temperature warehouse (1), an air terminal unit (3) is installed in the low temperature warehouse (1), a high-level air exhaust end (9) is installed at the upper part of the low temperature warehouse (1), and a first feed branch (13) and a second feed branch (14) are installed at the lower part of the low temperature warehouse (1). The conversion box (8) is connected to the high-level air exhaust end (9) and is connected to the first exhaust manifold (10), the second exhaust manifold (11) and the third exhaust manifold (12) respectively. A movable gate (16) is installed inside a conversion box (8) and has a flow window (17). A first outlet (18), a second outlet (19), and a third outlet (20) are sequentially arranged on the conversion box (8) along the moving direction of the movable gate (16). There is a solid plate surface without openings between two adjacent outlets. When the flow window (17) is opposite to any outlet, the outlet is connected to the high-level air exhaust end (9). When the flow window (17) is located between two adjacent outlets, the solid part of the movable gate (16) blocks the first outlet (18), the second outlet (19), and the third outlet (20).

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