Control method and device for safety cabinet, and safety cabinet

Abstract

The application relates to the technical field of laboratory safety detection, and discloses a control method for a safety cabinet, the safety cabinet comprising: a cabinet body, an inlet being formed in the side wall of the cabinet body; a fan being arranged in the cabinet body and located above the inlet; an operation table being arranged in the cabinet body and located below the inlet, the operation table being provided with an air inlet; a filtering module being arranged below the operation table; a driving module being arranged on one side of the filtering module close to the inlet; the filtering module being configured to be controllable; the control method comprising: determining the use state of the filtering module; in the case that the use state of the filtering module is a partial failure state, controlling the driving module to move the filtering module, so that an air flow passage is formed between the filtering module and the inner wall of the cabinet body. The normal operation of the air flow air curtain can be temporarily ensured. The application further discloses a control device for the safety cabinet and the safety cabinet.

Description

Technical Field

[0001] This application relates to the field of laboratory safety testing technology, such as a control method and device for a safety cabinet, and a safety cabinet. Background Technology

[0002] A biosafety cabinet is a common laboratory device that draws air outwards, maintaining a negative pressure environment inside the cabinet. It is designed to protect the operator, the laboratory environment, and the experimental materials from infectious aerosols and splashes that may be generated during the handling of primary cultures, bacterial and viral strains, and diagnostic specimens. Inside a biosafety cabinet, personnel are typically protected by vertical airflow from the work surface, and the air within the device is filtered and circulated through a combination of fans and ductwork.

[0003] In related technologies, a method for measuring and monitoring the wind speed of a biosafety cabinet is provided. By detecting the wind speed of the vertical airflow that plays a protective role inside the biosafety cabinet, an alarm signal is promptly issued when the wind speed is abnormal, notifying the user that there is a safety risk in the system.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] While the technology can alert users to safety risks when vertical airflow is abnormal, the malfunctioning vertical airflow can affect the safety of staff and biological samples because the experiment needs to be stopped and the biological samples need to be processed. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a control method and device for a biosafety cabinet, and a biosafety cabinet, thereby improving the safety protection of personnel and biological samples when the airflow curtain of the biosafety cabinet fails.

[0008] This disclosure provides a control method for a safety cabinet, the safety cabinet comprising: a cabinet body with an entrance on a side wall; a fan disposed within the cabinet body and above the entrance; an operating platform disposed within the cabinet body and below the entrance, the operating platform having an air inlet; a filter module disposed below the operating platform; a drive module disposed on the side of the filter module near the entrance; and the filter module configured to controllably move; under the action of the fan, airflow enters the cabinet body through the air inlet, passes through the filter module, forms a return air channel within the cabinet body, and forms an airflow curtain at the entrance;

[0009] The control method includes: determining the usage status of the filter module; and, when the usage status of the filter module is partially ineffective, controlling the drive module to move the filter module so that an airflow path is formed between the filter module and the inner wall of the cabinet.

[0010] Optionally, controlling the drive module to move the filter module includes:

[0011] The drive module is controlled to move the filter module to the side closest to the air outlet, causing the filter module to tilt upwards or downwards.

[0012] Optionally, controlling the drive module to move the filter module to the side closest to the air outlet includes:

[0013] Based on the airflow velocity of the air curtain, the drive module controls the height of the filter module to move closer to the air outlet.

[0014] Optionally, the flow rate of the airflow curtain is positively correlated with the height at which the drive module moves the filter module closer to the air outlet.

[0015] Optionally, determining the flow velocity of the airflow curtain includes:

[0016] The flow rate of the airflow curtain is determined based on the air supply velocity of the fan.

[0017] The air velocity of the fan is positively correlated with the airflow velocity of the air curtain.

[0018] Optionally, determining the usage status of the filtering module includes:

[0019] The operating status of the filter module is determined based on the air resistance as the air curtain passes through it.

[0020] Optionally, determining the usage status of the filter module based on the air resistance of the airflow curtain passing through the filter module includes:

[0021] The air resistance of the air curtain passing through the filter module is detected, and the air resistance value is obtained.

[0022] If all wind resistance detection values ​​are less than the resistance threshold, determine the minimum value among the wind resistance detection values;

[0023] If any of the wind resistance deviations between each wind resistance detection value and the minimum value is greater than the deviation threshold, then the filter module is determined to be partially ineffective.

[0024] In some embodiments, the control device for the safety cabinet includes a processor and a memory storing program instructions, the processor being configured to execute the control method for the safety cabinet as described above when the program instructions are executed.

[0025] In some embodiments, the safety cabinet includes: a cabinet body with an entrance on a side wall; a fan disposed inside the cabinet body and above the entrance; an operating platform disposed inside the cabinet body and below the entrance, with an air inlet on the operating platform; a filter module disposed below the operating platform; a wind resistance detection module configured to detect the wind resistance of the airflow curtain passing through the filter module to determine the usage status of the filter module; and a drive module disposed on the side of the filter module near the entrance, configured to controllably move the filter module to form an airflow path between the filter module and the inner wall of the cabinet body; under the action of the fan, airflow enters the cabinet body through the air inlet, passes through the filter module, forms a return air channel inside the cabinet body, and forms an airflow curtain at the entrance.

[0026] Optionally, the safety cabinet may also include a control device for the safety cabinet as described above.

[0027] The control method and device for a safety cabinet, and the safety cabinet itself, provided in this disclosure, can achieve the following technical effects:

[0028] The operational status of the filter module is determined by acquiring its air resistance value after the air curtain passes through it. If the filter module is partially malfunctioning, the drive module moves it, allowing the air curtain to circulate directly into the return air channel through a temporary airflow path between the filter module and the cabinet's inner wall. This temporarily ensures the normal operation of the air curtain, providing safety protection for laboratory personnel and biological samples inside the cabinet.

[0029] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0030] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0031] Figure 1 This is a schematic diagram of the structure of a safety cabinet provided in an embodiment of this disclosure;

[0032] Figure 2 This is a schematic diagram of the filter module structure of the safety cabinet provided in this embodiment;

[0033] Figure 3a This is a schematic diagram of the cooperation state between a driving module and a filtering module provided in an embodiment of this disclosure;

[0034] Figure 3b This is a schematic diagram of another cooperative state between the driving module and the filtering module provided in an embodiment of this disclosure;

[0035] Figure 4 This is a schematic flowchart of a control method for a safety cabinet provided in an embodiment of this disclosure;

[0036] Figure 5 This is a flowchart illustrating another control method for a safety cabinet provided in an embodiment of this disclosure;

[0037] Figure 6 This is a flowchart illustrating another control method for a safety cabinet provided in an embodiment of this disclosure;

[0038] Figure 7 This is a flowchart illustrating another control method for a safety cabinet provided in an embodiment of this disclosure;

[0039] Figure 8 This is a schematic diagram of a control device for a safety cabinet provided in an embodiment of this disclosure. Detailed Implementation

[0040] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] Unless otherwise stated, the term "multiple" means two or more.

[0043] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0044] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0045] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0046] Figure 1 This is a schematic diagram of the structure of a safety cabinet provided in an embodiment of this disclosure. The safety cabinet includes: a cabinet body 100, a fan 101, an operating table 102, a filter module 103, and a drive module 106. The cabinet 100 has an inlet 1001 on its side wall; a fan 101 is located inside the cabinet 100 and above the inlet 1001; an operating table 102 is located inside the cabinet 100 and below the inlet 1001, and an air inlet 1021 is provided on the operating table 102; a filter module 103 is located below the operating table 102; a drive module 106 is located on the side of the filter module 103 near the inlet 1001; the filter module 103 is configured as a controllable movable filter module; so that an airflow passage is formed between the filter module 103 and the inner wall of the cabinet 100; under the action of the fan 101, the airflow enters the cabinet 100 through the air inlet 1021, passes through the filter module 103 and forms a return air channel 104 inside the cabinet 100, and forms an airflow curtain at the inlet 1001.

[0047] In this way, the airflow entering the cabinet 100 forms a downward airflow curtain at the inlet 1001 of the cabinet 100 under the strong convection of the fan 101. After passing through the bottom filter module 103, the airflow returns to the top fan 101 through the return air channel 104 at the back of the cabinet and enters the next cycle.

[0048] The aforementioned airflow curtain is formed by the negative pressure created at the inlet 1001 by the air supplied by the fan 101. This airflow curtain prevents air from escaping from the biosafety cabinet. Simultaneously, by installing a filter module below the operating table, it prevents external air from entering the biosafety cabinet and contaminating the biological samples placed on the operating table, and avoids contaminants in the airflow entering the cabinet from the air inlet from remaining in the cabinet's return air duct.

[0049] Optionally, to better detect the protective status of the safety cabinet, the safety cabinet provided in this embodiment of the disclosure further includes:

[0050] The wind resistance detection module 105 is located on the leeward side of the filter module 103 to obtain the wind resistance value after the airflow curtain passes through the filter module 103.

[0051] Furthermore, to detect the usage status of each area of ​​the filter module 103 and thus determine the effectiveness of the airflow curtain, this embodiment includes multiple air resistance detection modules 105; these modules are arranged along the width of the airflow curtain on the leeward side of the filter module 103. This allows for the detection of the air resistance value of the airflow curtain after passing through each area of ​​the filter module 103. Consequently, in cases where some areas of the filter module 103 become blocked or covered by foreign objects, the user is promptly alerted to replace or adjust the module.

[0052] Figure 2 A schematic diagram of the filter module in an embodiment of this disclosure is shown. Exemplarily, the filter module includes four filter elements 1031 arranged along the width of the airflow curtain; each filter element 1031 has a wind speed sensing module 1051 disposed on its leeward side. In other embodiments of this application, the number of filter elements 1031 can be set according to the size of the designed safety cabinet and the needs of experimental safety.

[0053] In this embodiment, the four filter elements 1031 are arranged at equal widths along the width direction of the airflow curtain to enable detection of the airflow curtain in each area.

[0054] Furthermore, the drive module 106 controllably moves the filter module 103, thereby forming an airflow path between the filter module 103 and the inner wall of the cabinet 100. Thus, when the filter module 103 is in a partially failed state, the airflow curtain provides poor protection for the user. Temporary protection can be achieved by controlling the drive module 106 to move the filter module 103. This movement of the filter module 103 can include rotation, translation, tilting, or lifting, so that at least one side of the filter module 103 is removed from the inner wall of the cabinet, thereby forming a temporary airflow path. For example, controlling the drive module 106 to move the side of the filter module 103 near the air outlet causes the filter module to tilt upwards. At this time, the drive module 106 lifts the filter module, causing it to rise from the bottom of the cabinet's operating platform. A temporary airflow path is then formed between the side of the filter module 103 near the air inlet 1021 and the inner wall of the cabinet, allowing the airflow curtain to enter the return air channel 104 through this temporary airflow path, completing the circulation. This temporarily ensures the operation of the equipment.

[0055] Conversely, when the filter module 103 is lifted, the airflow curtain flows directly into the return air duct 104, which may allow debris and contaminants from outside the cabinet to enter the return air duct 104. To prevent contamination of the samples inside the cabinet during the next air supply cycle from the return air duct 104, an air supply filter module is also installed in the air supply direction of the fan 101. This protects the samples inside the cabinet.

[0056] Here, the drive module 106 may include an electric locking tongue structure composed of a locking tongue and a fixing part to move and lift the filter module. For example, the fixing part of the drive module 106 is sleeved on the outside of the locking tongue, and one end of the locking tongue is connected to the bottom of the filter module 103; when the locking tongue is energized, it extends out of the fixing part to lift the filter module 103, thereby lifting the filter module 103 and tilting it upward. In this way, when it is detected that the filter module 103 is in a partially failed state and the airflow curtain has poor protective function, controlling the drive module 106 to be energized will lift the filter module 103 through the locking tongue, causing the filter module 103 to tilt upward and form an airflow passage between it and the inner wall of the cabinet 100. The airflow curtain flows directly into the return air channel 104 through this airflow passage.

[0057] The drive module 106 may also include a magnetically controlled lifting assembly, comprising a first magnetic attractor located at the bottom of the filter module and a second magnetic attractor located on the cabinet. During normal operation, the first and second magnetic attractors attract each other magnetically, achieving the purpose of adsorbing the filter module 106. When the filter module 106 experiences blockage or other abnormalities and enters a partially failed state, the first and second magnetic attractors generate a repulsive force to lift the filter module 103, achieving a raised state and causing the filter module 103 to tilt upwards, forming an airflow passage between it and the inner wall of the cabinet 100. The airflow curtain flows directly into the return air channel 104 through this airflow passage.

[0058] Furthermore, when the second magnetic component is installed inside the cabinet and located below the filter module 103 near the air outlet, the attraction between the first and second magnetic components can move the filter module 103 to the side near the air outlet, causing it to tilt downwards and form an airflow passage between it and the inner wall of the cabinet 100. The airflow curtain flows directly into the return air channel 104 through this airflow passage.

[0059] Figure 3a and Figure 3b A schematic diagram illustrating the cooperation relationship between the driving module and the filtering module in an embodiment of this disclosure is shown. Figure 3a This indicates that the filter module is in normal working order; Figure 3b This shows the state where the drive module moves the filter module, causing it to tilt upwards.

[0060] Figure 4This disclosure provides a control method for a safety cabinet, applicable to... Figure 1 In the safety cabinet shown in Figure 3, it is determined whether it is necessary to control the drive module to move the filter module to provide temporary protection.

[0061] like Figure 4 As shown, the control method for the safety cabinet includes:

[0062] Step S401: The processor determines the usage status of the filtering module.

[0063] The usage states of the filter module correspond to different protection states of the airflow curtain. In this embodiment, the usage states include effective state, partially ineffective state, and completely ineffective state, corresponding to the effective protection state, partially ineffective protection state, and completely ineffective state of the airflow curtain.

[0064] Optionally, the operating status of the filter module can be determined based on the air resistance of the airflow curtain passing through the filter module.

[0065] Here, the operating status of the filter module can be determined by detecting the air resistance as the air curtain passes through it. The air resistance value refers to the filter module's ability to block airflow when the air curtain passes through it. The filter module's ability to block airflow is weaker when clean compared to its ability to block airflow when blocked by foreign objects. The air resistance value after the air curtain passes through the filter module when it is effective is weaker than the air resistance value after the air curtain fails or partially fails. The air resistance value can be determined by detecting the wind speed. Specifically, the wind speed is detected by a wind speed sensor located on the leeward side of the filter module, thus determining the aforementioned air resistance value.

[0066] In step S402, when the filter module is in a partially failed state, the processor controls the drive module to move the filter module so that an airflow path is formed between the filter module and the inner wall of the cabinet.

[0067] In the event of a partial failure of the filter module, the control drive module moves the filter module, allowing the airflow curtain to circulate directly into the return air duct through a temporary airflow path between the filter module and the inner wall of the cabinet. This temporarily ensures the normal operation of the airflow curtain and provides safety protection for experimental personnel and biological samples inside the cabinet.

[0068] Here, the drive module moves the filter module, causing it to rise from the bottom of the cabinet's control panel. At this point, a temporary airflow path is formed between the side of the filter module near the air inlet and the inner wall of the cabinet. An air curtain can then enter the return air duct through this temporary airflow path, completing the circulation. This temporarily ensures the equipment's operation.

[0069] Optionally, the drive module can reset the filter module when it is replaced or when the experiment ends.

[0070] Optionally, the control drive module moves the filter module, including:

[0071] The control drive module moves the filter module to the side closest to the air outlet, causing the filter module to tilt upwards or downwards.

[0072] Moving the filter module can include rotating, translating, tilting, or lifting it, so that at least one side of the filter module is away from the inner wall of the cabinet, thereby forming a temporary airflow path. Here, by controlling the drive module to move the side of the filter module near the air outlet, the filter module is tilted upwards or downwards. At this time, the filter module moves from the bottom of the cabinet operating panel, and a temporary airflow path is formed between its side near the air inlet and the inner wall of the cabinet. The airflow curtain can enter the return air channel from the temporary airflow path to complete the circulation. In this way, the equipment can be temporarily kept running.

[0073] When detecting the air resistance value after the air curtain passes through the leeward side of the filter module, if multiple air resistance detection modules are installed on the leeward side of the filter module, the air resistance values ​​of multiple areas of the filter module can be detected. At this time, the usage status of each area of ​​the filter module can be determined based on the detected wind speed values.

[0074] Figure 5 This disclosure provides a control method for a safety cabinet, which is used to describe the control method of the safety cabinet based on the air resistance detection results when multiple wind resistance detection modules are arranged along the width direction of the airflow curtain on the leeward side of the filter module.

[0075] Step S501: The processor detects the air resistance of the airflow curtain passing through the filter module and obtains the air resistance detection value; the air resistance detection value includes the air resistance detection value of the airflow curtain passing through multiple areas of the filter module; wherein, each area has a corresponding air resistance detection value.

[0076] The wind resistance values ​​of some or all areas of the filter module at the same time are obtained by multiple wind resistance detection modules set on the leeward side of the filter module.

[0077] In step S502, if some or all of the wind resistance detection values ​​are greater than the resistance threshold, the processor determines that the filter module has failed.

[0078] Here, the current wind resistance detection value is greater than the resistance threshold, indicating that the current filter module's ability to block the airflow curtain has exceeded the blocking capacity corresponding to the filter module's filtration performance.

[0079] The resistance threshold is related to the filtration performance of the filter module. The higher the filtration performance of the filter module, the higher the resistance threshold and the stronger its ability to block airflow; the lower the filtration performance, the lower the resistance threshold and the weaker its ability to block airflow.

[0080] Since the resistance threshold is determined by the filtration performance of the filter module, a detection of wind speed exceeding the resistance threshold indicates that the filtration area corresponding to that resistance value has failed. This prevents the airflow curtain from providing protection, necessitating the replacement of the filter module.

[0081] Optionally, when the filtering module is in a completely unusable state, the first failure message is executed.

[0082] The first message indicates that the filter module corresponding to the current test result is in a failed state. That is, it informs the operator that the filter module is currently ineffective, possibly due to blockage by foreign objects, obstruction, or other abnormalities. The airflow curtain protection is currently ineffective, unable to prevent airflow from leaking out of the cabinet, and there is a possibility of contamination of the biological samples on the worktable. The safety of the biological samples inside the biosafety cabinet has been compromised. Therefore, the filter module needs to be replaced.

[0083] Since the resistance threshold is determined by the filtration performance of the filter module, when a wind speed reading exceeds the resistance threshold, it indicates that the filtration area corresponding to that wind resistance reading has failed. This prevents the airflow curtain from providing protection, necessitating the execution of the first failure warning message.

[0084] Step S503: If all current wind resistance detection values ​​are less than the resistance threshold, the processor determines the minimum value among the wind resistance detection values.

[0085] In step S504, if the processor finds a wind resistance deviation value greater than the deviation threshold among the wind resistance deviation values ​​between each wind resistance detection value and the minimum value, it determines that the filter module is in a partially failed state.

[0086] Wind resistance deviation refers to the difference in wind resistance between the two sides when airflow is directed to the side with lower wind resistance due to higher wind resistance on one side.

[0087] Deviation threshold refers to the reasonable deviation range of wind resistance values ​​between different areas of the filter module under all effective conditions.

[0088] When all current wind resistance detection values ​​are less than the resistance threshold, it indicates that the filter module is not completely ineffective. At this time, the current minimum wind resistance detection value, as well as the wind resistance deviation value between the other current wind resistance detection values ​​and the current minimum value, are used to determine the usage status of the filter module.

[0089] In a non-completely failed state, the filter module's operational status also includes a partially failed state and a fully effective state. A partially failed state means that an abnormality occurs in a portion of the filter module, causing the airflow curtain at that location to fail. A fully effective state means that the entire filter module is functioning normally, and the airflow curtain can perform its protective function correctly.

[0090] When the deviation between each wind resistance detection value and the minimum value exceeds the deviation threshold, it indicates that the filtration area of ​​the filter module corresponding to the current wind speed detection value is blocked by foreign objects. When the airflow curtain passes through the filter module, the airflow that should flow through this area will flow to the filtration area with the lowest wind resistance value and enter the return air channel. The airflow curtain above this area is ineffective.

[0091] In step S505, if the filter module is in a partially failed state, the processor controls the drive module to move the filter module so that an airflow path is formed between the filter module and the inner wall of the cabinet.

[0092] In this way, when the filter module is partially inoperable, the drive module moves the filter module, causing the side of the filter module near the air inlet to tilt upwards or downwards. At this time, a temporary airflow path is formed between the side of the filter module near the air inlet and the inner wall of the cabinet. The airflow curtain can then enter the return air duct through the temporary airflow path, completing the circulation. This temporarily ensures the operation of the equipment.

[0093] Furthermore, if the filtering module is in a partially failed state, a second failure message is also provided to indicate that the filtering module is partially failed.

[0094] The second failure message indicates that the filter module corresponding to the current test result is in a partially failed state. Specifically, it informs the operator that the filter module is currently partially failed, and there may be abnormalities such as blockage or obstruction in certain areas. The airflow curtain protection is currently ineffective. Although a temporary airflow curtain can be established by moving the filter module, it is recommended to stop the experiment as soon as possible. The second failure message is less impactful than the first. The impact can be reflected by the frequency of the message within a set timeframe.

[0095] Thus, when the deviation between the current wind resistance detection value and the current minimum wind resistance value exceeds the deviation threshold, it indicates that the filtration area of ​​the filter module corresponding to the current wind speed detection value is blocked by foreign objects. When the airflow curtain passes through the filter module, the airflow that should flow through this area will flow to the filtration area with the lowest wind resistance value and enter the return air channel. The airflow curtain above this area fails. At this time, on the one hand, the drive module is controlled to move the filter module so that the airflow curtain can directly enter the return air channel for circulation through the temporary airflow path between the filter module and the inner wall of the cabinet. This temporarily ensures the normal operation of the airflow curtain. On the other hand, by executing the second failure prompt message, the experimental operator is prompted to replace the filter module as soon as possible or stop the experiment as soon as possible.

[0096] When the control drive module moves the filter module, the airflow path no longer passes through the filter module, thus reducing air resistance and increasing air velocity. This increases the volume of air drawn in by negative pressure from the air inlet, which can affect the normal operation of the biosafety cabinet. At this time, the height at which the filter module is moved can be adjusted to regulate the airflow path.

[0097] Figure 6 This disclosure provides a control method for a safety cabinet, which describes a method for adjusting the height of a drive module moving a filter module near the air outlet.

[0098] like Figure 6 As shown, the control method for the safety cabinet includes:

[0099] Step S601: The processor determines the usage status of the filtering module.

[0100] Step S602: If the filter module is in a partially failed state, the processor obtains the flow rate of the airflow curtain.

[0101] In step S603, the processor controls the drive module to move the filter module closer to the air outlet according to the airflow rate of the air curtain, so that an airflow passage is formed between the filter module and the inner wall of the cabinet.

[0102] Different experimental operations and different experimental nodes require different flow rates for the airflow curtain.

[0103] The height of the filter module near the air outlet can include the height between the highest and lowest points of the filter module when the side of the filter module near the air outlet is tilted upward or downward; it can also include the distance between the side of the filter module near the air outlet and the air outlet when the side of the filter module near the air outlet is tilted upward or downward.

[0104] Here, the height of the drive module moving the filter module near the air outlet can be determined based on the flow rate of the airflow curtain, so that the airflow path formed between the filter module and the inner wall of the cabinet matches the wind speed of the airflow curtain.

[0105] Optionally, the flow rate of the airflow curtain is positively correlated with the height of the filter module near the air outlet as the drive module moves it.

[0106] Specifically, the airflow velocity of the aforementioned air curtain is positively correlated with the height at which the filter module is moved near the air outlet by the drive module. The lower the airflow velocity, the smaller the height the filter module is moved near the air outlet, and the smaller the flow rate in the airflow path formed between the filter module and the inner wall of the cabinet. Conversely, the higher the airflow velocity, the higher the filter module is moved near the air outlet, the greater the flow rate in the airflow path formed between the filter module and the inner wall of the cabinet, and the more airflow enters the return air duct.

[0107] Optionally, determining the flow velocity of the aforementioned airflow curtain includes:

[0108] The airflow velocity of the air curtain is determined based on the fan's supply air velocity; the fan's supply air velocity and the airflow velocity of the air curtain are positively correlated.

[0109] Since the airflow curtain is formed by the combined airflow entering from the inlet and the airflow delivered by the fan, and the airflow entering from the inlet is drawn in by the negative pressure generated by the fan at the inlet, the fan's delivery air velocity and the airflow curtain velocity are correlated; the higher the fan's delivery air velocity, the higher the airflow curtain velocity. The delivery air velocity can be obtained using a wind speed sensor installed on the fan's delivery side.

[0110] In this embodiment, since the air delivered by the fan needs to pass through the air supply filter module to form an airflow curtain inside the cabinet, the leeward side wind speed of the air supply filter module is obtained as the aforementioned fan delivery wind speed, thereby determining the flow rate of the airflow curtain.

[0111] The control method for biosafety cabinets provided in this disclosure determines the operational status of the filter module by acquiring the air resistance value after the air curtain passes through it. When the filter module is partially in a faulty state, the control drive module moves the filter module according to the airflow velocity of the air curtain, allowing the air curtain to circulate directly into the return air channel through a temporary airflow path between the filter module and the inner wall of the cabinet. This temporarily ensures the normal operation of the air curtain, providing safety protection for experimental personnel and biological samples inside the cabinet.

[0112] Optionally, when the driving module is a magnetically controlled spring-loaded assembly, the moving height of the filter module can be adjusted by regulating the magnitude of the repulsive / attractive force between the first and second magnetic components. Specifically, the greater the current intensity applied to the first and / or second magnetic components, the higher the moving height of the filter module.

[0113] Optionally, the drive module can reset the filter module when it is replaced or when the experiment ends.

[0114] After the control drive module moves the filter module, the airflow no longer passes through the filter module, and the flow velocity entering the fan through the return air duct increases, affecting the normal protective function of the airflow curtain. At this point, the fan can be adjusted to regulate the flow velocity of the airflow curtain accordingly.

[0115] Figure 7 This disclosure provides a control method for a safety cabinet, which describes the method for adjusting the fan after the drive module moves the filter module.

[0116] like Figure 7 As shown, the control method for the safety cabinet includes:

[0117] In step S701, the processor determines the usage status of the filtering module.

[0118] Step S702: If the filter module is in a partially failed state, the processor obtains the flow rate of the airflow curtain.

[0119] In step S703, the processor controls the drive module to move the filter module closer to the air outlet according to the airflow velocity of the air curtain, thus moving the filter module. At this time, an airflow path is formed between the filter module and the inner wall of the cabinet.

[0120] In step S704, after a set time, the processor reduces the fan speed by moving the filter module closer to the air outlet according to the height of the drive module.

[0121] The set duration is used to indicate the time required for the airflow curtain to operate stably after the drive module moves the filter module to a height closer to the air outlet.

[0122] After the filter module is moved, the airflow resistance in the return air duct decreases and the airflow speed increases. At this time, by reducing the fan speed, the airflow curtain speed is corrected to achieve the protection function.

[0123] Optionally, the reduced fan speed can be determined based on the correspondence between the height of the filter module near the air outlet and the reduction in fan speed.

[0124] The correspondence between the height of the moving filter module near the air outlet and the reduction in fan speed can be represented by a one-to-one data table. This correspondence can be established experimentally. After obtaining the current height of the moving filter module near the air outlet, the corresponding reduction in fan speed can be obtained by querying the database. Reducing the current fan speed by this reduction value yields the reduced fan speed.

[0125] Optionally, the height of the drive module moving the filter module near the air outlet is positively correlated with the reduction in fan speed. The higher the height of the drive module moving the filter module near the air outlet, the greater the reduction in fan speed, and the lower the fan speed after the reduction.

[0126] Figure 8 This is a schematic diagram of a control device for a safety cabinet provided in an embodiment of this disclosure. (In conjunction with...) Figure 8 As shown, the control device for the safety cabinet includes:

[0127] The device includes a processor 80 and a memory 81. Optionally, it may further include a communication interface 82 and a bus 83. The processor 80, communication interface 82, and memory 81 can communicate with each other via the bus 83. The communication interface 82 can be used for information transmission. The processor 80 can call logical instructions in the memory 81 to execute the control method for the safety cabinet described in the above embodiment.

[0128] Furthermore, the logic instructions in the aforementioned memory 81 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0129] The memory 81, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 80 executes functional applications and data processing by running the program instructions / modules stored in the memory 81, thereby implementing the control method for the safety cabinet in the above embodiments.

[0130] The memory 81 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 81 may include high-speed random access memory and may also include non-volatile memory.

[0131] This disclosure provides a safety cabinet, comprising a cabinet body with an entrance on its side wall; a fan disposed within the cabinet body and above the entrance; an operating platform disposed within the cabinet body and below the entrance, with an air inlet on the operating platform; a filter module disposed below the operating platform; a drive module disposed on the side of the filter module near the entrance; the filter module is configured to be controllable and movable; to form an airflow path between the filter module and the inner wall of the cabinet body; under the action of the fan, airflow enters the cabinet body through the air inlet, passes through the filter module, forms a return air channel within the cabinet body, and forms an airflow curtain at the entrance; and a wind resistance detection module is configured to detect the wind resistance of the airflow curtain passing through the filter module to determine the usage status of the filter module.

[0132] Optionally, the aforementioned safety cabinet may also include the aforementioned control device for the safety cabinet.

[0133] This disclosure provides a storage medium storing computer-executable instructions configured to execute the control method described above for a security cabinet.

[0134] The aforementioned storage medium can be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0135] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0136] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0137] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0138] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0139] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a security cabinet, characterized by, The safety cabinet comprises: a cabinet body, a side wall of the cabinet body being provided with an entrance; a fan arranged in the cabinet body and located above the entrance; an operation table arranged in the cabinet body and located below the entrance, the operation table being provided with an air inlet; a filter module arranged below the operation table; a driving module arranged on one side of the filter module close to the entrance; configured to controllably move the filter module; under the action of the fan, air enters the cabinet body through the air inlet, forms a return air passage in the cabinet body after passing through the filter module, and forms an air flow curtain at the entrance; The control method comprises: determining the use state of the filter module; in the case that the use state of the filter module is a partial failure state, controlling the driving module to move the filter module, so that a temporary air flow passage is formed between the filter module and the inner wall of the cabinet, and the air flow curtain enters the return air passage through the temporary air flow passage for circulation.

2. The control method according to claim 1, characterized by, The control of the driving module moving the filter module comprises: controlling the driving module to move the side of the filter module close to the air outlet, so that the filter module is inclined upward or downward.

3. The control method according to claim 2, characterized by, controlling the driving module to move the side of the filter module close to the air outlet comprises: controlling the height of the side of the filter module close to the air outlet moved by the driving module according to the flow rate of the air flow curtain.

4. The control method according to claim 3, characterized by, The flow rate of the air flow curtain is positively correlated with the height of the side of the filter module close to the air outlet moved by the driving module.

5. The control method according to claim 3, characterized by, The determination of the flow rate of the air flow curtain comprises: determining the flow rate of the air flow curtain according to the air supply speed of the fan; The air supply speed of the fan is positively correlated with the flow rate of the air flow curtain.

6. The control method according to claim 1, characterized by The determination of the use state of the filter module comprises: determining the use state of the filter module according to the air resistance of the air flow curtain passing through the filter module.

7. The control method according to claim 6, characterized by The determination of the use state of the filter module according to the air resistance of the air flow curtain passing through the filter module comprises: detecting the air resistance of the air flow curtain passing through the filter module to obtain an air resistance detection value; determining the minimum value of the air resistance detection values in the case that all the air resistance detection values are less than a resistance threshold value; in the air resistance deviation values of the respective air resistance detection values and the minimum value, if there is an air resistance deviation value greater than a deviation threshold value, it is determined that the use state of the filter module is a partial failure.

8. A control device for a security cabinet, characterized in that A computer program product comprising a processor and a memory having stored therein program instructions, wherein the processor is configured to execute the program instructions to perform the control method for the safety cabinet according to any one of claims 1 to 7.

9. A safety cabinet characterized by comprises: a cabinet body, a side wall of the cabinet body being provided with an entrance; a fan arranged in the cabinet body and located above the entrance; an operation table arranged in the cabinet body and located below the entrance, the operation table being provided with an air inlet; a filter module arranged below the operation table; an air resistance detection module configured to detect the air resistance of the air flow curtain passing through the filter module to determine the use state of the filter module; a driving module arranged on one side of the filter module close to the entrance; configured to controllably move the filter module, so that an air flow passage is formed between the filter module and the inner wall of the cabinet. Under the action of the fan, the airflow enters the cabinet through the air inlet, passes through the filter module to form a return air passage in the cabinet, and forms an airflow air curtain at the inlet. The control device for the safety cabinet according to claim 8.

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