Uniform air outlet biosafety cabinet

Abstract

The application discloses a biosafety cabinet with uniform air outlet, and relates to the technical field of experimental equipment. The biosafety cabinet comprises a cabinet body, an air outlet flange, a hanging door and a front window glass. A static pressure box is arranged above the inside of the cabinet body. A working area inner container is arranged below the static pressure box. Compared with the current biosafety cabinet, the biosafety cabinet can realize multi-dimensional dynamic adjustment of air flow distribution by arranging a first baffle plate and a second baffle plate which can be independently horizontally moved in the static pressure box and combining with a gas guide groove opening degree adjusting assembly, so that the air flow is fully and uniformly distributed before entering the air supply filter. In addition, through cooperation of a monitoring element and an isolation assembly, polluted air caused by damage of a filter element can be prevented from entering the working area. Through cooperation of a cleaning assembly and a sterilization and disinfection module, the service life of the filter element can be prolonged, and the surface of the working area and the inside of the cabinet body can be sterilized and disinfected in all directions.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, specifically a biosafety cabinet with uniform airflow. Background Technology

[0002] Biosafety cabinets are negative pressure filtration protective devices widely used in medical and health, disease control, biopharmaceutical, food testing and scientific research fields. They use a fan to drive airflow to form a directional flow inside the cabinet, and use high-efficiency air filters (such as ULPA filters) to intercept and purify aerosols, microbial particles and dust inside the cabinet, while preventing contaminated air from leaking into the operating area or laboratory environment, thus providing effective safety protection for operators and the working environment.

[0003] Existing biosafety cabinets typically utilize plenum chambers to ensure uniform airflow. For example, the patent "CN220737602U Class II Biosafety Cabinet with Plasma Disinfection Function" discloses a biosafety cabinet that effectively disinfects gases. However, in actual operation, factors such as fan speed fluctuations, external air interference, and the opening and closing of doors and windows can affect the total amount and velocity distribution of airflow entering the plenum chamber. The superposition of these factors can easily lead to uneven spatial distribution of air velocity at the outlet of the plenum chamber, resulting in higher air velocity in some areas and lower air velocity in others within the working area, thereby disrupting the uniform vertical laminar flow state required for operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to improve the uniformity of airflow and anti-interference ability of biosafety cabinets, and to this end, a biosafety cabinet with uniform airflow is provided.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a biosafety cabinet with uniform airflow, comprising a cabinet body, an exhaust flange, a hanging door, and a front window glass. A static pressure box is arranged at the top of the cabinet body, and a working area liner is arranged below the static pressure box. A table panel is arranged at the bottom of the working area liner. A fan is arranged at the side air inlet of the static pressure box. An air supply filter is arranged at the end of the static pressure box near the working area liner, and an exhaust filter is arranged at the end of the static pressure box away from the working area liner. The exhaust flange is located at the top of the cabinet body, and the air outlet of the exhaust filter is connected to the exhaust flange. The fan drives the contaminated air inside the cabinet and the outside air to pass through the through holes arranged at both ends of the table panel and enter the static pressure box. After being purified by the exhaust filter and the air supply filter, part of the filtered clean air exits from the exhaust flange, and part of the filtered clean air enters the working area liner.

[0006] Furthermore, the static pressure chamber is equipped with a first baffle plate and a second baffle plate. The first and second baffle plates are connected to the side wall of the static pressure chamber via independent horizontal moving modules (e.g., a screw and nut mechanism). The first baffle plate is equipped with a first air guide groove and a first adjusting component, while the second baffle plate is equipped with a second air guide groove and a second adjusting component. The horizontal position of the first and second baffle plates can be independently adjusted via the horizontal moving modules, thereby changing the flow path length and resistance distribution of the airflow within the static pressure chamber. The opening size of the first and second air guide grooves can be adjusted via the first and second adjusting components, thereby adjusting the local airflow velocity. Through this technical solution, the airflow is fully homogenized before entering the air supply filter, effectively avoiding the problem of uneven airflow velocity distribution in the static pressure chamber caused by fan speed fluctuations or external air interference during actual use of existing biosafety cabinets, significantly improving the equipment's anti-interference capability.

[0007] Furthermore, the air supply filter is provided with several mounting cavities, each of which can be detachably installed with a filter element. The filter element is a ULPA filter. Several wind speed detection elements are installed on the side wall of the inner liner of the working area, with each wind speed detection element corresponding to a specific filter element. When the wind speed detected by a certain wind speed detection element deviates from the set value, the control system determines that the corresponding filter element may be blocked and issues an alarm signal. The operator can stop the machine and replace the corresponding filter element according to the actual situation. If the operator cannot immediately stop the machine due to ongoing experiments, uninterrupted sample collection, or lack of spare filter elements, etc. The machine replacement operation can be achieved by controlling the horizontal movement module to drive the first and second baffles to shift horizontally towards the filter element corresponding to the area with low air velocity. At the same time, the opening of the local air guide channel corresponding to this shift direction is increased by the first and second adjustment components, thereby guiding more airflow to the area where the filter element with increased resistance is located, compensating for the decrease in air volume caused by the blockage of the filter element at that location. By setting dynamically adjustable first and second baffles in the static pressure box, this invention can compensate for the airflow in a specific area of ​​the air supply filter without stopping the machine, thereby ensuring the uniformity and stability of the air supply of the biosafety cabinet during operation.

[0008] Furthermore, the horizontal movement module includes a first lead screw assembly and a second lead screw assembly. The first deflector plate is fixedly mounted on the nut of the first lead screw assembly, and the second deflector plate is fixedly mounted on the nut of the second lead screw assembly. The first lead screw assembly and the second lead screw assembly drive the first deflector plate and the second deflector plate to move independently horizontally within the static pressure box.

[0009] Furthermore, the first adjustment component includes a mounting frame, a first linear drive, and an adjustment plate. The adjustment plate is disposed within the first baffle plate, the mounting frame is disposed on the side of the first baffle plate, and the first linear drive is disposed within the mounting frame. The adjustment plate is connected to the working end of the first linear drive via a connecting component. When it is necessary to adjust the opening of the first air guide channel, the operator can activate the first linear drive through the control system. The first linear drive drives the adjustment plate to move up and down within the first baffle plate, thereby changing the effective ventilation cross-sectional area of ​​the first air guide channel. The structure and working principle of the second adjustment component are exactly the same, and will not be described in detail here.

[0010] Furthermore, the connecting assembly includes a fixing cover, an electromagnet, and a connecting block. The fixing cover is fixedly installed on the working end of the first linear drive component, the electromagnet is embedded in the fixing cover, and the connecting block is disposed on the side of the adjusting plate. The working end of the first linear drive component passes through the connecting block, and the end of the connecting block away from the first linear drive component is connected to the mounting bracket via a compression spring. During normal operation, the electromagnet is energized to attract the connecting block, at which point the connecting block is fixedly connected to the fixing cover. The operator can move the adjusting plate through the first linear drive component as needed, thereby changing the first air guide groove (or the second air guide groove). With an effective ventilation cross-sectional area, dynamic control of airflow distribution uniformity is achieved. When the first linear drive component experiences mechanical jamming or the control system detects abnormal conditions such as the adjustment plate moving beyond its travel range, the electromagnet instantly loses power and demagnetizes. At this time, under the pre-compression force of the compression spring, the connecting block quickly drives the adjustment plate to spring back to its initial position along the working end of the first linear drive component, restoring the first air guide groove to its maximum opening or preset safe opening state. Through the above-mentioned automatic reset mechanism, the occurrence of phenomena such as local airflow blockage in the static pressure box and sudden increase in local load on the air supply filter caused by the adjustment plate being jammed in an abnormal position can be effectively avoided.

[0011] Furthermore, a support frame is provided at one end of the air supply filter near the inner liner of the working area. Several monitoring elements (such as thermal imaging cameras or particle counters) are provided on the side wall of the support frame. Each monitoring element corresponds to a filter element. An isolation component is provided at the end of the air supply filter near the static pressure box. The monitoring elements are electrically connected to the isolation component. The monitoring elements monitor whether the air discharged from the filter elements is abnormal, thereby determining whether a filter element is damaged. When a filter element is determined to be damaged, the control system drives the isolation component to move above the damaged filter element, so that the damaged filter element is sealed and isolated, preventing unfiltered polluted air from directly entering the inner liner of the working area. This invention avoids the time cost of experimental interruption, sample loss, or re-establishing a clean environment after equipment restart caused by downtime.

[0012] Furthermore, the isolation assembly includes a first linear module and an isolation plate. The isolation plate is disposed inside the side end of the air supply filter and is connected to the working end of the first linear module. The isolation plate is larger than the size of several mounting cavities. When it is necessary to isolate a certain filter element, the first linear module drives the isolation plate to move horizontally to directly above the mounting cavity, so that the mounting cavity is completely covered by the isolation plate, thereby sealing and isolating the target filter element.

[0013] Furthermore, the isolation assembly includes a first linear module and a sealing frame. The sealing frame is disposed inside the side end of the air supply filter and is connected to the working end of the first linear module. Two telescopic plates are disposed within the sealing frame, and a second linear drive is disposed between the two telescopic plates. The two working ends of the second linear drive are respectively connected to the two telescopic plates. When the isolation assembly is not in operation, the two telescopic plates retract into the sealing frame. When a filter element needs to be sealed and isolated, the first linear module moves the sealing frame above the target filter element, and then the second linear drive pushes the two telescopic plates to move in opposite directions until they are tightly fitted against the side walls of the mounting cavity, forming a partial seal. Through the above technical solution, the isolation assembly in this embodiment is completely retracted in the non-operating state, without occupying additional airflow channel space, ensuring the maximum effective ventilation area of ​​the air supply filter during normal operation. In addition, the two telescopic plates can adapt to mounting cavities of different widths, possessing good versatility and sealing reliability, ensuring effective sealing and isolation of filter elements of different sizes, preventing cross-contamination of airflow due to filter element damage, and improving the reliable operation of the biosafety cabinet. Furthermore, the support frame is equipped with an air distribution mesh plate to further disperse and evenly distribute the filtered airflow. A cleaning component is located inside the air supply filter near the support frame, allowing for backflushing and cleaning of several filter elements during shutdown. The cleaning assembly includes an exhaust pipe, a second linear module, and an air pump. A nozzle is located at one end of the exhaust pipe near several filter elements. The air inlet of the exhaust pipe is connected to the air pump via a flexible hose. The side end of the exhaust pipe is connected to the working end of the second linear module. When the invention is not in operation and cleaning of several filter elements is required, the second linear module, air pump, and fan can be activated. The second linear module drives the exhaust pipe to reciprocate below the filter elements, while the air pump continuously supplies air. High-pressure gas is ejected from the nozzle, blowing off the dust adhering to the filter elements. The fan then draws away the air containing dust particles and discharges it to the outside.

[0014] Furthermore, ultraviolet lamps are installed on the side walls of the inner working area to sterilize the surface of the working area with ultraviolet light during working breaks. In addition, a sterilization module is installed at the connection between the air inlet of the fan and the static pressure box (the sterilization module can be selected as a plasma sterilizer or hydrogen peroxide sterilizer, etc., as needed). After the work is completed, the cabinet door can be closed, and then the sterilization module and the fan can be turned on, so that the gas inside the cabinet continuously passes through the sterilization module and then flows into every corner of the cabinet, thereby performing a comprehensive sterilization operation on the cabinet.

[0015] Compared with existing technologies, the advantages of this invention are as follows: Compared with current biosafety cabinets, this invention, by setting independently movable first and second baffles within the static pressure chamber and combining them with an air guide slot opening adjustment component, can achieve multi-dimensional dynamic adjustment of airflow distribution, ensuring that the airflow is fully homogenized before entering the air supply filter, significantly improving the equipment's anti-interference capability. Furthermore, when the filter element becomes clogged and cannot be replaced immediately by stopping the machine, the offset of the baffles and the increase in the air guide slot opening can compensate for the clogged area without stopping the machine, ensuring uniform and stable airflow. Simultaneously, the connecting component in this invention, composed of an electromagnet and a compression spring, has an automatic reset mechanism, which can automatically spring the adjusting plate back to its original position when the adjusting component experiences jamming or overtravel. This invention features a full-position design to avoid localized airflow blockage and sudden load increases. Finally, through the cooperation of monitoring elements and isolation components, it can automatically seal and isolate damaged filter elements when they break, preventing contaminated air from entering the work area and avoiding experimental interruptions and sample loss. The isolation component is adaptable to installation cavities of different widths, possessing excellent versatility and sealing reliability, ensuring effective sealing and isolation of filter elements of different sizes, preventing cross-contamination of airflow caused by filter element damage, and improving the reliable operation of the biosafety cabinet. After work, through the cooperation of cleaning components and sterilization modules, the filter elements can be backflushed and cleaned, extending their service life, and comprehensive sterilization and disinfection of the work area surface and cabinet interior can be achieved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cabinet of the present invention; Figure 3 This is a schematic diagram of gas flow inside the cabinet of the present invention; Figure 4 This is a schematic diagram of the internal structure of the static pressure chamber of the present invention; Figure 5 This is a schematic diagram of the structure of the first adjustment component of the present invention; Figure 6This is a schematic diagram of the connection component structure of the present invention; Figure 7 This is a schematic diagram of the air supply filter structure of the present invention; Figure 8 This is a schematic diagram showing the location of the monitoring element of the present invention; Figure 9 This is a schematic diagram showing the location of the isolation component of the present invention; Figure 10 This is a schematic diagram of the internal structure of the sealing frame of the present invention.

[0017] In the diagram: 1. Cabinet; 11. Fan; 2. Exhaust flange; 3. Hanging door; 4. Front window glass; 5. Countertop; 6. Inner working area; 61. Ultraviolet lamp; 7. Static pressure box; 71. First baffle; 72. Second baffle; 73. First lead screw assembly; 74. Second lead screw assembly; 75. Mounting bracket; 751. First linear drive; 752. Fixing cover; 753. Electromagnet; 76. Adjusting plate; 761. Connecting block; 8. Exhaust filter; 9. Supply air filter; 91. Filter element; 92. Support frame; 921. Monitoring element; 922. Air distribution mesh plate; 93. Mounting cavity; 94. Exhaust pipe; 95. First linear module; 96. Sealing frame; 961. Telescopic plate; 962. Second linear drive; 97. Second linear module; 98. Air pump. Detailed Implementation

[0018] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Figures 1-10 As shown, this invention provides a technical solution: a biosafety cabinet with uniform airflow, comprising a cabinet body 1, an exhaust flange 2, a hanging door 3, and a front window glass 4. A static pressure box 7 is installed at the top of the cabinet body 1, and a working area liner 6 is installed below the static pressure box 7. A work surface 5 is installed at the bottom of the working area liner 6. A fan 11 is installed at the side air inlet of the static pressure box 7. An air supply filter 9 is installed at the end of the static pressure box 7 near the working area liner 6, and an exhaust filter 8 is installed at the end of the static pressure box 7 away from the working area liner 6. The exhaust flange 2 is located at the top of the cabinet body 1, and the outlet of the exhaust filter 8 is connected to the exhaust flange 2. During operation, the fan 11 drives contaminated air from inside the cabinet body 1 and outside air through the through holes at both ends of the work surface 5 into the static pressure box 7. After purification by the exhaust filter 8 and the air supply filter 9, part of the filtered clean air exits through the exhaust flange 2, and part of the filtered clean air enters the working area liner 6 (the airflow paths of contaminated air and outside air inside the cabinet body 1 can be referenced). Figure 3Wherein: thin solid lines represent filtered clean air, dashed lines represent polluted air, and thick solid lines represent outside air. Finally, to facilitate operators in adjusting the airflow uniformity in real time as needed, this invention provides a first baffle 71 and a second baffle 72 inside the static pressure chamber 7. The first baffle 71 and the second baffle 72 are respectively connected to the side wall of the static pressure chamber 7 through independent horizontal moving modules (e.g., a screw and nut mechanism). Simultaneously, the first baffle 71 is provided with a first air guide groove and a first adjusting component, and the second baffle 72 is provided with a second air guide groove and a second adjusting component. Compared to current biosafety cabinets, this invention... The horizontal movement module can independently adjust the horizontal position of the first baffle plate 71 and the second baffle plate 72, thereby changing the flow path length and resistance distribution of the airflow in the static pressure box 7. The opening size of the first air guide groove and the second air guide groove can be adjusted by the first adjustment component and the second adjustment component respectively, thereby realizing the adjustment of the local airflow speed. Through the above technical solution, the airflow is fully homogenized before entering the air supply filter 9, effectively avoiding the problem of uneven airflow distribution in the static pressure box 7 caused by fan speed fluctuations or external air interference during actual use of existing biosafety cabinets, and significantly improving the equipment's anti-interference capability.

[0020] like Figures 1-9 As shown, the air supply filter 9 has several mounting cavities 93, each of which can be detachably installed with a filter element 91 (the filter element 91 is a ULPA filter). Several wind speed detection elements are installed on the side wall of the inner liner 6 of the working area, each corresponding to one of the filter elements 91. When the wind speed detected by a certain wind speed detection element deviates from the set value, the control system of this invention determines that the corresponding filter element 91 may be clogged and issues an alarm signal. At this time, the operator can stop the machine and replace the corresponding filter element 91 according to the actual situation. If the operator cannot immediately perform the stop and replacement operation due to ongoing experiments, uninterrupted sample collection, or lack of spare filter elements 91, the operator... Personnel can control the horizontal movement module to drive the first baffle 71 and the second baffle 72 to shift horizontally towards the filter element 91 corresponding to the area with low wind speed. At the same time, the first adjustment component and the second adjustment component increase the opening of the local air guide channel corresponding to the shift direction, thereby guiding more airflow to the area where the filter element 91 with increased resistance is located, compensating for the decrease in air volume caused by the blockage of the filter element 91. Compared with the current biosafety cabinets, the present invention, by setting the first baffle 71 and the second baffle 72 with dynamic adjustment in the static pressure box 7, can compensate for the airflow in a specific area of ​​the air supply filter 9 without stopping the machine, thereby ensuring the uniformity and stability of the air supply of the biosafety cabinet during operation.

[0021] like Figures 4-6As shown, the horizontal movement module includes a first lead screw assembly 73 and a second lead screw assembly 74. A first deflector plate 71 is fixedly mounted on the nut of the first lead screw assembly 73, and a second deflector plate 72 is fixedly mounted on the nut of the second lead screw assembly 74. The first lead screw assembly 73 and the second lead screw assembly 74 drive the first deflector plate 71 and the second deflector plate 72 to move independently horizontally within the static pressure chamber 7. The first adjustment assembly includes a mounting bracket 75, a first linear drive component 751, and an adjustment plate 76. The adjustment plate 76 is disposed within the first deflector plate 71. The first linear drive 751 is located on the side of the first baffle 71 and is installed inside the mounting bracket 75. The adjusting plate 76 is connected to the working end of the first linear drive 751 through a connecting assembly. When it is necessary to adjust the opening of the first air guide groove, the operator can open the first linear drive 751 through the control system. The first linear drive 751 drives the adjusting plate 76 to move up and down within the first baffle 71, thereby changing the effective air passage cross-sectional area of ​​the first air guide groove. Finally, the structure and working principle of the second adjusting assembly are exactly the same, and will not be described in detail here.

[0022] like Figures 5-6 As shown, the connecting assembly includes a fixed cover 752, an electromagnet 753, and a connecting block 761. The fixed cover 752 is fixedly installed on the working end of the first linear drive 751. The electromagnet 753 is embedded in the fixed cover 752. The connecting block 761 is located on the side of the adjusting plate 76. The working end of the first linear drive 751 passes through the connecting block 761. The end of the connecting block 761 away from the first linear drive 751 is connected to the mounting bracket 75 via a compression spring. During normal operation, the electromagnet 753 is energized and attracts the connecting block 761. At this time, the connecting block 761 is fixedly connected to the fixed cover 752. The operator can move the adjusting plate 76 as needed through the first linear drive 751, thereby changing the first linear drive 751. The effective ventilation cross-sectional area of ​​the air groove (or the second air guide groove) enables dynamic control of the uniformity of airflow distribution. When the first linear drive 751 experiences mechanical jamming or the control system detects abnormal conditions such as the overtravel of the adjustment plate 76, the electromagnet 753 instantly loses power and demagnetizes. At this time, under the pre-compression force of the compression spring, the connecting block 761 quickly drives the adjustment plate 76 to spring back to the initial position along the working end of the first linear drive 751, so that the first air guide groove is restored to the maximum opening or the preset safe opening state. Through the above-mentioned automatic reset mechanism, the occurrence of phenomena such as local airflow blockage in the static pressure box 7 and sudden increase in local load of the air supply filter 9 due to the adjustment plate 76 being jammed in an abnormal position can be effectively avoided.

[0023] like Figures 7-9As shown, a support frame 92 is provided at one end of the air supply filter 9 near the inner liner 6 of the working area. Several monitoring elements 921 (existing devices such as thermal imaging cameras or particle counters can be selected) are provided on the side wall of the support frame 92. The monitoring elements 921 correspond one-to-one with several filter elements 91. An isolation component is provided at one end of the air supply filter 9 near the static pressure box 7. The monitoring elements 921 are electrically connected to the isolation component. The monitoring elements 921 monitor whether the air discharged from the filter elements 91 is abnormal, thereby determining whether a filter element 91 is damaged. When it is determined that a filter element 91 is damaged, the control system drives the isolation component to move above the damaged filter element 91, so that the damaged filter element 91 is sealed and isolated, preventing unfiltered polluted air from directly entering the inner liner 6 of the working area. Through the above technical solution, the present invention avoids the time cost of experimental interruption, sample loss or re-establishing a clean environment after equipment restart caused by downtime.

[0024] like Figures 7-9 As shown, the isolation assembly includes a first linear module 95 and an isolation plate. The isolation plate is disposed inside the side end of the air supply filter 9 and is connected to the working end of the first linear module 95. The isolation plate is larger than the size of several mounting cavities 93. When it is necessary to isolate a certain filter element 91, the first linear module 95 drives the isolation plate to move horizontally to directly above the mounting cavity 93, so that the mounting cavity 93 is completely covered by the isolation plate, thereby sealing and isolating the target filter element 91.

[0025] like Figures 7-9 As shown, the support frame 92 is equipped with an air distribution mesh plate 922, which is used to further disperse and evenly distribute the filtered airflow. The air supply filter 9 is equipped with a cleaning component at one end near the support frame 92. When the machine is stopped, the cleaning component is used to backflush and clean several filter elements 91.

[0026] like Figures 7-9 As shown, the cleaning assembly includes an exhaust pipe 94, a second linear module 97, and an air pump 98. The exhaust pipe 94 has a nozzle at one end near several filter elements 91. The air inlet of the exhaust pipe 94 is connected to the air pump 98 via a hose. The side end of the exhaust pipe 94 is connected to the working end of the second linear module 97. When the invention is not in operation and cleaning of several filter elements 91 is required, the second linear module 97, the air pump 98, and the fan 11 can be turned on. The second linear module 97 drives the exhaust pipe 94 to reciprocate below the filter elements 91, while the air pump 98 continuously supplies air. High-pressure gas is ejected from the nozzle, blowing off the dust adhering to the filter elements 91. The fan 11 then draws away the air containing dust particles and discharges it to the outside.

[0027] like Figures 7-9As shown, an ultraviolet lamp 61 is installed on the side wall of the inner chamber 6 of the working area for ultraviolet sterilization of the surface of the working area during working breaks. In addition, a sterilization module is installed at the connection between the air inlet of the fan 11 and the static pressure box 7 (the sterilization module can be selected as a plasma sterilizer or hydrogen peroxide sterilization device, etc., as needed). After the work is completed, the cabinet 1 door can be closed, and then the sterilization module and the fan 11 can be turned on, so that the gas in the cabinet 1 continuously passes through the sterilization module and then flows into all corners of the cabinet 1, thereby performing a comprehensive sterilization operation on the cabinet 1.

[0028] Working Principle: During operation, the fan 11 is started, driving the polluted air inside the cabinet 1 and the outside air through the through holes at the front and rear ends of the tabletop 5 into the static pressure box 7. Inside the static pressure box 7, the air flows successively through the first baffle 71 and the second baffle 72. The horizontal position of the two baffles is independently adjusted by the horizontal moving module, and the opening of the air guide slot is changed by the adjusting component to make the airflow uniform. Subsequently, the air is purified by the exhaust filter 8 and the supply filter 9. A portion of the clean air is discharged from the exhaust flange 2, and the other portion enters the inner liner 6 of the working area to form a uniform downward airflow. When the wind speed detection element measures a certain filtration... When the wind speed of component 91 is too low, the control system determines that the component is blocked and alarms. If it cannot be replaced by stopping the machine, the baffle plate is driven to shift to that side and the opening of the corresponding air guide groove is increased to compensate for the air volume. If the monitoring component 921 detects that a filter element 91 is damaged, the first linear module 95 drives the isolation plate to move above the damaged filter element 91 to seal and isolate it, preventing unfiltered air from entering the working area. When the machine stops, the second linear module 97 drives the exhaust pipe 94 to move back and forth, and the air pump 98 supplies air to achieve the purpose of back-blowing and cleaning several filter elements 91. At the same time, the fan 11 discharges the gas containing dust particles.

[0029] Example 2: Figures 8-10As shown, a biosafety cabinet with uniform airflow is described in this embodiment. The structure is basically the same as in Embodiment 1, except that the isolation assembly includes a first linear module 95 and a sealing frame 96. The sealing frame 96 is located inside the side end of the air supply filter 9 and is connected to the working end of the first linear module 95. Two telescopic plates 961 are disposed inside the sealing frame 96, and a second linear drive 962 is disposed between the two telescopic plates 961. The two working ends of the second linear drive 962 are respectively connected to the two telescopic plates 961. When the isolation assembly is not in operation, the two telescopic plates 961 retract into the sealing frame 96. When it is necessary to seal and isolate a filter element 91, the first linear module 95 moves the sealing frame 96 into the air supply filter 96. 6. Move the device above the target filter element 91, and then the second linear drive 962 pushes the two telescopic plates 961 to move in opposite directions until they are tightly fitted with the side walls of the mounting cavity 93, forming a local seal and isolation. Through the above technical solution, the isolation component in Embodiment 2 is completely retracted in the non-working state, without occupying additional airflow channel space, ensuring the maximum effective ventilation area of ​​the air supply filter 9 during normal operation. In addition, the two telescopic plates 961 can adapt to mounting cavities 93 of different widths, possessing good versatility and sealing reliability, ensuring effective sealing and isolation of filter elements 91 of different sizes, preventing cross-contamination of airflow caused by damage to the filter element 91, and improving the reliable operation of the biosafety cabinet.

[0030] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biosafety cabinet with uniform airflow, comprising a cabinet body (1), an exhaust flange (2), a hanging door (3), and a front window glass (4), characterized in that: The cabinet (1) is provided with a working area liner (6) and a static pressure box (7). The working area liner (6) is provided with a table panel (5) at the end away from the air supply filter (9). The static pressure box (7) is provided with an air supply filter (9) at the end near the working area liner (6). The static pressure box (7) is provided with an exhaust filter (8) at the end away from the working area liner (6). The air outlet of the exhaust filter (8) is connected to the exhaust port flange (2). The air inlet of the static pressure box (7) is provided with a fan (11). The static pressure box (7) is provided with a first baffle plate (71) and a second baffle plate (72). The first baffle plate (71) and the second baffle plate (72) are both connected to the static pressure box (7) through a horizontal moving module. The first baffle plate (71) is provided with a first air guide groove and a first adjustment component. The second baffle plate (72) is provided with a second air guide groove and a second adjustment component.

2. The biosafety cabinet with uniform airflow according to claim 1, characterized in that: The air supply filter (9) is provided with several installation cavities (93), and each installation cavity (93) is provided with a filter element (91). Several wind speed detection elements are provided on the side wall of the inner liner (6) of the working area, and the several wind speed detection elements correspond one-to-one with the several filter elements (91).

3. A biosafety cabinet with uniform airflow according to claim 1, characterized in that: The horizontal movement module includes a first lead screw assembly (73) and a second lead screw assembly (74). The first deflector plate (71) is disposed at the working end of the first lead screw assembly (73), and the second deflector plate (72) is disposed at the working end of the second lead screw assembly (74). The first adjustment assembly includes a mounting bracket (75), a first linear drive (751), and an adjustment plate (76). The adjustment plate (76) is disposed inside the first deflector plate (71), the mounting bracket (75) is disposed on the side of the first deflector plate (71), the first linear drive (751) is disposed inside the mounting bracket (75), and the adjustment plate (76) is connected to the working end of the first linear drive (751) through a connecting assembly. The first adjustment assembly and the second adjustment assembly have the same structure.

4. A biosafety cabinet with uniform airflow according to claim 3, characterized in that: The connecting assembly includes a fixed cover (752), an electromagnet (753), and a connecting block (761). The fixed cover (752) is connected to the working end of the first linear drive (751). The electromagnet (753) is disposed inside the fixed cover (752). The connecting block (761) is connected to the adjusting plate (76). The working end of the first linear drive (751) passes through the connecting block (761). The end of the connecting block (761) away from the first linear drive (751) is connected to the mounting bracket (75) through a compression spring.

5. A biosafety cabinet with uniform airflow according to any one of claims 2-4, characterized in that: The air supply filter (9) is provided with a support frame (92) at one end near the inner liner (6) of the working area. Several monitoring elements (921) are provided on the side wall of the support frame (92). The several monitoring elements (921) correspond one-to-one with several filter elements (91). An isolation component is provided at one end of the air supply filter (9) near the static pressure box (7). The several monitoring elements (921) are all electrically connected to the isolation component.

6. A biosafety cabinet with uniform airflow according to claim 5, characterized in that: The isolation assembly includes a first linear module (95) and an isolation plate. The isolation plate is disposed inside the side end of the air supply filter (9). The isolation plate is connected to the working end of the first linear module (95). The isolation plate is larger than the size of several mounting cavities (93).

7. A biosafety cabinet with uniform airflow according to claim 5, characterized in that: The isolation assembly includes a first linear module (95) and a sealing frame (96). The sealing frame (96) is disposed inside the side end of the air supply filter (9). The sealing frame (96) is connected to the working end of the first linear module (95). Two telescopic plates (961) are disposed inside the sealing frame (96). A second linear drive (962) is disposed between the two telescopic plates (961). The two working ends of the second linear drive (962) are respectively connected to the two telescopic plates (961).

8. A biosafety cabinet with uniform airflow according to claim 5, characterized in that: The support frame (92) is provided with an air distribution mesh plate (922), and the air supply filter (9) is provided with a cleaning component at one end near the support frame (92).

9. A biosafety cabinet with uniform airflow according to claim 8, characterized in that: The cleaning assembly includes an exhaust pipe (94), a second linear module (97), and an air pump (98). The exhaust pipe (94) has a nozzle at one end near a plurality of filter elements (91). The air inlet of the exhaust pipe (94) is connected to the air pump (98) via a hose. The side end of the exhaust pipe (94) is connected to the working end of the second linear module (97).

10. A biosafety cabinet with uniform airflow according to claim 1, characterized in that: An ultraviolet lamp (61) is installed on the side wall of the inner liner (6) of the working area, and a sterilization module is installed at the end of the fan (11) near the air inlet of the static pressure box (7).

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