Biosafety exhaust cabinet with emergency sealing and purifying functions

Abstract

The invention relates to a biological safety exhaust cabinet with emergency sealing and purifying functions, and relates to the field of biological safety exhaust cabinets. The equipment comprises an equipment bottom box, an air exhaust cabinet is fixedly installed on the upper end face of the equipment bottom box, an operation window cover capable of being opened in an overturning mode is installed on the front end face of the air exhaust cabinet, side window assemblies are installed on the two sides of the air exhaust cabinet, and the side window assemblies are fixedly connected with the air exhaust cabinet. An ultraviolet lamp set and a negative pressure sensor are fixedly installed on the inner side face of the exhaust cabinet, a safety ventilation system is further fixedly installed at the head of the exhaust cabinet, and a filter box set is fixedly installed at the lower end of the safety ventilation system. According to the transparent window plate, the annular groove is formed in the side face cabinet plate, the elastic air bag rubber strip is installed in the annular groove, the elastic air bag rubber strip serves as a structure for rapidly sealing the periphery of the transparent window plate under the emergency situation, and a closed barrier can be rapidly formed in cooperation with the air supply assembly under the emergency situation.

Description

Technical Field

[0001] This application relates to the technical field of biosafety fume hoods, and in particular to biosafety fume hoods with emergency sealing and purification functions. Background Technology

[0002] In the field of biological experimental research, experiments involving bioaerosols often carry certain safety risks. Bioaerosols are tiny particles containing pathogens such as microorganisms and viruses that are suspended in the air. If they leak outside the experimental environment, they can pose a serious threat to the health of experimental personnel and the surrounding environment. Therefore, ensuring the safety of biological experimental operations is crucial, and biosafety fume hoods, as key equipment commonly used in biological experiments, directly affect the safe conduct of experiments.

[0003] Existing biosafety fume hoods lack a rapid and effective sealing structure in emergency situations. When leaks occur, manual sealing is often required, but manual operation is slow, and it can take a long time from the discovery of the leak to its sealing. During this time, a large amount of bioaerosol may have already leaked out, increasing the risk of infection for laboratory personnel and the possibility of environmental pollution.

[0004] Secondly, existing fume hoods have deficiencies in terms of sealing detection and handling. Although some fume hoods may be equipped with some simple detection devices, they lack a mechanism to respond quickly and automatically seal when sealing problems are detected. Once the sealing of parts such as side panels is compromised, it cannot be repaired in a timely and effective manner, leading to continuous leakage of bioaerosols.

[0005] Furthermore, existing fume hoods are slow to respond to leaks. While end-of-line purification devices can filter the exhaust air, they cannot promptly inactivate or trap pathogens that have already leaked inside the hood, leaving certain safety hazards still present. Summary of the Invention

[0006] To address the issue of poor safety in existing biosafety fume hoods, this application provides a biosafety fume hood with emergency sealing and purification functions.

[0007] The biosafety fume hood with emergency sealing and purification functions provided in this application adopts the following technical solution:

[0008] A biosafety fume hood with emergency sealing and purification functions includes a base box. A fume hood is fixedly installed on the upper surface of the base box. A flip-open operating window cover is installed on the front surface of the fume hood. Side window assemblies are installed on both sides of the fume hood and are fixedly connected to it. An ultraviolet lamp assembly and a negative pressure sensor are fixedly installed on the inner surface of the fume hood. A safety ventilation system is fixedly installed at the head of the fume hood, and a filter assembly is fixedly installed at the lower end of the safety ventilation system. Two emergency sealing window assemblies are also installed on both sides inside the fume hood and are fixedly connected to it. An air supply assembly that works in conjunction with the emergency sealing window assemblies is also installed in the base box.

[0009] By adopting the above technical solution, the equipment base box provides convenient and stable support on the ground. A set of universal wheels with a braking structure can be installed on the lower end of the base box, allowing for flexible movement to different locations and quick locking at a designated position. The fume hood is fixedly installed on the upper end of the base box, ensuring stable operation. Side windows on both sides of the fume hood facilitate better observation from the sides, increasing visibility inside. The base box, fume hood, side window components, safety ventilation system, filter assembly, emergency sealing window assembly, and air supply assembly are organically combined to form a complete biosafety fume hood system with emergency sealing and purification functions. The flip-open operating window cover facilitates operation by laboratory personnel. The ultraviolet lamp assembly disinfects the interior, and the negative pressure sensor monitors the internal pressure in real time, ensuring a negative pressure state and preventing bioaerosol leakage. The safety ventilation system and filter assembly purify and exhaust the air inside the cabinet, while the emergency sealing window assembly and air supply assembly work together to achieve rapid sealing in emergencies.

[0010] Optionally, the exhaust cabinet includes a main cabinet and side cabinet panels. The side cabinet panels are fixedly installed on both sides of the main cabinet, and the side cabinet panels are provided with positioning grooves for installing side window components. An inner support frame is fixedly installed in the positioning grooves.

[0011] By adopting the above technical solution, the fume hood features a main cabinet and side cabinet panels, which facilitates processing and assembly. The positioning grooves and internal support frames provide accurate positioning and support for the installation of the side window components, ensuring the stability and sealing of the side window components during installation.

[0012] Optionally, the positioning groove of the side panel is provided with an annular groove, and an elastic airbag strip is embedded in the annular groove. The lower end of the elastic airbag strip is provided with a connecting air pipe connected to the air supply component, and the connecting air pipe is sealed to the elastic airbag strip.

[0013] By adopting the above technical solution, the design of the annular groove and the elastic airbag strip allows the elastic airbag strip to expand when inflated by the air supply component, thereby achieving a seal between the side window assembly and the side cabinet panel. When the side cabinet panel's sealing performance is compromised, the air supply component can be activated to supply air to the elastic airbag strip, enhancing the sealing effect of the side cabinet panel. This inflatable sealing method has a fast response time, excellent sealing effect, and effectively prevents bioaerosol leakage from the side window.

[0014] Optionally, the side window assembly includes a transparent window panel, a sealing ring, and an outer pressure frame assembly. The transparent window panel is installed in the positioning groove of the side cabinet panel. The sealing ring is fitted and fixed to the edges on both sides of the transparent window panel. The outer pressure frame assembly presses against the sealing ring on the outside of the transparent window panel and is fixedly connected to the side cabinet panel.

[0015] By adopting the above technical solution, the transparent window panel of the side window assembly makes it easier for experimental personnel to observe the situation inside the cabinet. The sealing ring can further enhance the sealing between the transparent window panel and the outer pressure frame assembly. The outer pressure frame assembly presses against the sealing ring on the outside of the transparent window panel and is fixedly connected to the side cabinet panel, ensuring the overall stability and sealing of the side window assembly.

[0016] Optionally, the outer pressure frame assembly includes an outer support frame and an outer ring plate. The outer support frame is integrally formed and disposed on the inner side of the outer ring plate. The outer ring plate has a plurality of connection holes for connecting to the side cabinet panels.

[0017] By adopting the above technical solution, the outer support frame and outer ring plate of the outer pressure frame assembly are integrally molded, resulting in a robust structure. The connection holes facilitate the connection between the outer pressure frame assembly and the side cabinet panel, ensuring that the outer pressure frame assembly can be firmly pressed against the transparent window panel, further improving the sealing performance of the side window assembly.

[0018] Optionally, the safety ventilation system includes a top cover, an exhaust motor, and an exhaust impeller. The top cover is fixedly installed in the main cabinet. The exhaust motor is configured as two sets, and the two sets of exhaust motors are respectively fixedly installed on both sides of the top cover. The exhaust impeller is sleeved and fixed on the output shaft of the exhaust motor.

[0019] By adopting the above technical solution, the safety ventilation system employs a design with two sets of exhaust motors and impellers. One set is used for normal operation exhaust, and the other is used for emergency exhaust. This ensures that air inside the cabinet can be quickly exhausted in the event of a malfunction. Furthermore, both sets of exhaust motors and impellers are integrated into the same top cover, ensuring that air is treated with the same quality during emergency exhaust. The top cover provides installation space and protection for the exhaust motors and impellers, ensuring the stable operation of the ventilation system.

[0020] Optionally, the top cover includes a main housing, an exhaust pipe, and a bottom frame for fixing the exhaust fan motor. A partition block is fixedly installed in the middle of the main housing, which divides the space in the main housing into two installation spaces for installing two sets of exhaust impellers respectively. The exhaust pipe is configured as two sets, and the two sets of exhaust pipes are fixed on both sides of the upper end face of the main housing respectively. The bottom frame is fixedly installed on the lower end face of the main housing. A one-way valve is also installed in the exhaust pipe.

[0021] By adopting the above technical solution, the partition block of the top cover divides the main housing space into two sets of installation spaces, allowing the two sets of exhaust impellers to work independently and the exhaust channels to not interfere with each other, thus improving the reliability of the ventilation system. The one-way valve in the exhaust pipe prevents backflow of external air, ensuring the one-way nature of the exhaust and improving the purification effect.

[0022] Optionally, the filter box assembly includes a snap-fit ​​shell, an arc-shaped filter screen, and a HEPA filter layer installed in the exhaust pipe. The lower end face of the snap-fit ​​shell is evenly provided with several sets of strip grooves, and the snap-fit ​​shell is snapped and fixed to the lower end face of the bottom frame. The arc-shaped filter screen is fixedly installed in the snap-fit ​​shell.

[0023] By adopting the above technical solution, the arc-shaped filter screen of the filter box assembly can initially filter large particles, while the HEPA filter layer can efficiently filter fine particles and pathogens. The strip groove design increases the area for air to enter the filter box assembly, improving filtration efficiency and preventing large-volume substances from entering the housing and affecting the normal operation of the ventilation system. The housing is fastened and fixed to the lower end of the base frame, facilitating the installation and replacement of filter components.

[0024] Optionally, the emergency window sealing assembly includes an internal frame, a top winding roller, a bottom winding roller, a drive motor, and a window sealing cloth for covering the positioning groove. The internal frame is fixedly installed in the main cabinet. The top winding roller is rotatably installed on the upper end of the internal frame, and the bottom winding roller is rotatably installed on the lower end of the internal frame. The bottom winding roller is connected to the top winding roller via a synchronous belt. The drive motor is fixedly installed in the main cabinet, and the output end of the drive motor is fixedly connected to one end of the bottom winding roller. The lower end of the window sealing cloth is wound onto the bottom winding roller, and several pull ropes are installed on the upper end of the window sealing cloth. One end of each pull rope is wound onto the top winding roller, and the lower end of each pull rope is fixedly connected to the window sealing cloth.

[0025] By adopting the above technical solution, the emergency window sealing component is designed as an internal frame, top rewind roller, bottom rewind roller, drive motor, and window sealing cloth working together. During installation, the internal frame serves as the main structure, fixedly installed in the main cabinet. The top and bottom rewind rollers are rotatably mounted at both ends of the internal frame and connected to each other by a synchronous belt, ensuring synchronized rotation. The window sealing cloth is fitted against the inner side of the side cabinet panel and can be rolled up by the bottom rewind roller. The emergency window sealing component uses a drive motor to drive the bottom rewind roller, which in turn drives the top rewind roller to rotate synchronously, realizing the unfolding and rolling up of the window sealing cloth. Under normal use, the window sealing cloth can be rolled up to ensure normal visibility of the side cabinet panel. In emergencies, the window sealing cloth can be quickly unfolded to cover the positioning groove, and with the help of the elastic airbag pressure strip, a seal can be achieved, effectively preventing the leakage of bioaerosols. A pull rope is installed at the top of the window sealing cloth to facilitate better rolling up via the top rewind roller.

[0026] Optionally, the internal frame includes a middle frame shell, a top shaft bracket, and a bottom shaft bracket. The top shaft bracket and the bottom shaft bracket are respectively fixed to the upper and lower sides of the middle frame shell. An elastic airbag pressure strip for pressing and sealing the window cloth is embedded in the side of the middle frame shell facing the side panel. A second connecting air pipe is provided on the elastic airbag pressure strip. The air supply component includes a miniature air pump and a three-way valve. The miniature air pump is fixedly installed in the equipment base box. The outlet of the miniature air pump is connected to the air inlet of the three-way valve. The first air outlet and the second air outlet of the three-way valve are respectively sealed and connected to the first connecting air pipe and the second connecting air pipe.

[0027] By adopting the above technical solution, and designing the internal frame with a central frame, top shaft, and bottom shaft that work together, the top winding roller can be rotated and installed via the top shaft, while the bottom shaft ensures stable rotation of the bottom winding roller. The top and bottom shafts also stably control the distance between them, allowing the sealing fabric to better cover the positioning groove. The air supply component, consisting of a miniature air pump and a three-way valve, selectively supplies air to the elastic airbag strips and pressure strips, achieving rapid sealing of the side windows and the sealing fabric. The elastic airbag pressure strips hold the sealing fabric in place, further improving the window's sealing performance.

[0028] In summary, this application includes at least one of the following beneficial technical effects: By creating an annular groove on the side panel and installing an elastic airbag strip within it, the elastic airbag strip serves as a rapid sealing structure around the transparent window panel in emergencies. In conjunction with the air supply component, it can quickly form a sealed barrier in an emergency, increasing the response speed by tens of times compared to manual sealing and effectively preventing the leakage of bioaerosols. A corresponding sealing detection mechanism can be installed around the side panel. When a problem with the side panel's sealing is detected, the air supply component rapidly supplies air to the elastic airbag strip, causing the sealing structure to expand quickly and achieve a rapid seal. If the side panel's sealing problem is not resolved after the elastic airbag strip is inflated, the emergency window sealing component can be activated. The sealing cloth on the emergency window sealing component quickly seals and blocks the positioning groove. This double sealing structure effectively prevents internal gas leakage from the side. Furthermore, the safety ventilation system is equipped with two sets of exhaust structures, ensuring that if one exhaust structure malfunctions, the other set of rapid exhaust structures can be activated promptly. Furthermore, the physical modules for UV disinfection and HEPA filtration work in tandem to rapidly inactivate and trap pathogens within the cabinet after a leak, avoiding the lag in end-of-pipe purification. The UV lamp assembly disinfects the air and surfaces inside the cabinet, while the HEPA filter layer efficiently filters out fine particles and pathogens, ensuring that the exhaust air meets safety standards. Attached Figure Description

[0029] Figure 1 This is a perspective view of the overall structure in the embodiments of this application.

[0030] Figure 2 yes Figure 1 Front view of the device shown.

[0031] Figure 3 This is an exploded structural diagram of the overall structure in the embodiments of this application.

[0032] Figure 4 yes Figure 3 Front view of the device shown.

[0033] Figure 5 This is a perspective view of the exhaust fan in the embodiments of this application.

[0034] Figure 6 yes Figure 5 Side view of the device shown.

[0035] Figure 7 This is an exploded structural diagram of the safety ventilation system and filter box assembly in an embodiment of this application.

[0036] Figure 8 yes Figure 7 Side view of the device shown.

[0037] Figure 9This is a top view of the top cover and HEPA filter layer in combination in the embodiments of this application.

[0038] Figure 10 This is a perspective view of the emergency window sealing component in the embodiments of this application.

[0039] Figure 11 yes Figure 10 Side view of the device shown.

[0040] Figure 12 This is a perspective view of the window curtain in the embodiments of this application.

[0041] Figure 13 This is a perspective view of the emergency window sealing component in the embodiments of this application when the window sealing cloth is not installed.

[0042] Figure 14 yes Figure 13 Rear view of the device shown.

[0043] Explanation of reference numerals in the attached drawings: 1. Equipment base box; 2. Fume hood; 20. Operating window cover; 201. Positioning groove; 21. Main cabinet; 22. Side cabinet panel; 221. Inner support frame; 222. Annular groove; 23. Elastic airbag rubber strip; 231. Connecting air pipe one; 3. Side window assembly; 31. Transparent window panel; 32. Sealing ring; 33. Outer pressure frame assembly; 331. Outer support frame; 332. Outer ring plate; 333. Connecting hole; 4. Safety ventilation system; 41. Top cover; 411. Main shell; 412. Exhaust pipe; 413. Bottom frame; 414. Divider block; 4 2. Exhaust fan motor; 43. Exhaust fan impeller; 5. Filter box assembly; 51. Casing; 511. Strip groove; 52. Arc-shaped filter screen; 53. HEPA filter layer; 6. Emergency window sealing assembly; 61. Internal frame; 611. Middle frame; 612. Top shaft bracket; 613. Bottom shaft bracket; 614. Elastic airbag pressure strip; 615. Connecting air pipe 2; 62. Top winding roller; 63. Bottom winding roller; 631. Synchronous belt; 64. Drive motor; 65. Window sealing cloth; 651. Pull cord; 7. Air supply assembly; 71. Miniature air pump; 72. Three-way valve. Detailed Implementation

[0044] The present application will be further described in detail below with reference to the accompanying drawings.

[0045] This application discloses a biosafety fume hood with emergency sealing and purification functions. (Refer to...) Figure 1 , Figure 2 , Figure 3 and Figure 4A biosafety fume hood 2 with emergency sealing and purification functions includes an equipment base box 1. The fume hood 2 is fixedly installed on the upper surface of the equipment base box 1. The front surface of the fume hood 2 is equipped with a flip-open operating window cover 20. Side window assemblies 3 are installed on both sides of the fume hood 2 and are fixedly connected to the fume hood 2. An ultraviolet lamp group and a negative pressure sensor are fixedly installed on the inner side of the fume hood 2. A safety ventilation system 4 is also fixedly installed at the head of the fume hood 2. A filter box group 5 is fixedly installed at the lower end of the safety ventilation system 4. Two sets of emergency sealing window assemblies 6 are also installed on both sides inside the fume hood 2 and are fixedly connected to the fume hood 2. An air supply assembly 7 that cooperates with the emergency sealing window assembly 6 is also installed in the equipment base box 1. The equipment base 1 provides stable support for use on the ground, and a set of casters with brakes can be installed on the lower end of the base 1 for easy movement to different locations and quick locking at a designated position. The fume hood 2 is fixedly installed on the upper end of the base 1 to ensure stable operation. Side window assemblies 3 on both sides of the fume hood 2 facilitate better observation from the sides, increasing visibility of the interior. The base 1, fume hood 2, side window assemblies 3, safety ventilation system 4, filter assembly 5, emergency sealing window assembly 6, and air supply assembly 7 are organically combined to form a complete biosafety fume hood 2 system with emergency sealing and purification functions. The flip-open operating window cover 20 facilitates operation by laboratory personnel. The ultraviolet lamp assembly disinfects the interior, and the negative pressure sensor monitors the internal pressure in real time to ensure a negative pressure state and prevent the leakage of bioaerosols. The safety ventilation system 4 and the filter box assembly 5 can purify and exhaust the air inside the cabinet. The emergency sealing window assembly 6 and the air supply assembly 7 work together to achieve rapid sealing in emergency situations.

[0046] Reference Figure 4 , Figure 5 and Figure 6The fume hood 2 includes a main cabinet 21 and side cabinet panels 22. The side cabinet panels 22 are fixedly installed on both sides of the main cabinet 21, and the side cabinet panels 22 have positioning grooves 201 for installing the side window assembly 3. An inner support frame 221 is fixedly installed in the positioning grooves 201. The fume hood 2 adopts the structural design of the main cabinet 21 and the side cabinet panels 22, which facilitates processing and assembly. The positioning grooves 201 and the inner support frames 221 provide accurate positioning and support for the installation of the side window assembly 3, ensuring the stability and sealing of the installation of the side window assembly 3. The positioning grooves 201 of the side cabinet panels 22 have an annular groove 222 inside, and an elastic airbag rubber strip 23 is embedded in the annular groove 222. The lower end of the elastic airbag rubber strip 23 is provided with a connecting air pipe 231 connected to the air supply assembly 7. The connecting air pipe 231 is sealed to the elastic airbag rubber strip 23. The design of the annular groove 222 and the elastic airbag strip 23 allows the elastic airbag strip 23 to expand when inflated by the air supply component 7, thereby achieving a seal between the side window assembly 3 and the side cabinet panel 22. When the sealing of the side cabinet panel 22 fails, the air supply component 7 can be activated to supply air to the elastic airbag strip 23, thereby increasing the sealing effect of the side cabinet panel 22. This inflatable sealing method has a fast response speed, good sealing effect, and can effectively prevent bioaerosol leakage from the side window.

[0047] Reference Figure 3 and Figure 4 The side window assembly 3 includes a transparent window panel 31, a sealing ring 32, and an outer pressure frame assembly 33. The transparent window panel 31 is installed in the positioning groove 201 of the side cabinet panel 22. The sealing ring 32 is fitted and fixed to the edges of both sides of the transparent window panel 31. The outer pressure frame assembly 33 presses against the sealing ring 32 on the outside of the transparent window panel 31, and is fixedly connected to the side cabinet panel 22. The transparent window panel 31 of the side window assembly 3 facilitates observation of the interior of the cabinet by the experimental personnel. The sealing ring 32 further enhances the sealing between the transparent window panel 31 and the outer pressure frame assembly 33. The outer pressure frame assembly 33 presses against the sealing ring 32 on the outside of the transparent window panel 31 and is fixedly connected to the side cabinet panel 22, ensuring the overall stability and sealing of the side window assembly 3. The outer pressure frame assembly 33 includes an outer support frame 331 and an outer ring plate 332. The outer support frame 331 is integrally formed on the inner side of the outer ring plate 332. The outer ring plate 332 has several sets of connection holes 333 for connecting to the side panel 22. The outer support frame 331 and the outer ring plate 332 of the outer pressure frame assembly 33 are integrally formed, resulting in a robust structure. The connection holes 333 facilitate the connection between the outer pressure frame assembly 33 and the side panel 22, ensuring that the outer pressure frame assembly 33 can be firmly pressed onto the transparent window panel 31, further improving the sealing performance of the side window assembly 3.

[0048] Reference Figure 7 and Figure 8The safety ventilation system 4 includes a top cover 41, an exhaust motor 42, and an exhaust impeller 43. The top cover 41 is fixedly installed in the main cabinet 21. Two sets of exhaust motors 42 are configured, with each set fixedly installed on one side of the top cover 41. The exhaust impeller 43 is sleeved and fixed on the output shaft of the exhaust motor 42. The safety ventilation system 4 employs a design with two sets of exhaust motors 42 and exhaust impellers 43: one set for normal operation exhaust and the other for emergency exhaust, ensuring rapid air removal from the cabinet in case of malfunction. Furthermore, integrating the two sets of exhaust motors 42 and exhaust impellers 43 into the same top cover 41 ensures consistent air quality during emergency exhaust. The top cover 41 provides installation space and protection for the exhaust motors 42 and exhaust impellers 43, ensuring stable operation of the ventilation system. The top cover 41 includes a main housing 411, an exhaust pipe 412, and a base frame 413 for fixing the exhaust fan motor 42. A partition block 414 is fixedly installed in the middle of the main housing 411, dividing the space in the main housing 411 into two installation spaces for the two sets of exhaust impellers 43 to be installed respectively. Two sets of exhaust pipes 412 are provided, and the two sets of exhaust pipes 412 are fixed on both sides of the upper end face of the main housing 411 respectively. The base frame 413 is fixedly installed on the lower end face of the main housing 411. A one-way valve is also installed in the exhaust pipe 412. The partition block 414 of the top cover 41 divides the space of the main housing 411 into two installation spaces, allowing the two sets of exhaust impellers 43 to work independently, with no interference between the exhaust channels, thus improving the reliability of the ventilation system. The one-way valve in the exhaust pipe 412 prevents backflow of external air, ensuring the one-way nature of the exhaust and improving the purification effect.

[0049] Reference Figure 7 , Figure 8 and Figure 9 The filter assembly 5 includes a housing 51, an arc-shaped filter 52, and a HEPA filter layer 53 installed in the exhaust pipe 412. The lower end face of the housing 51 has several sets of strip-shaped grooves 511 evenly distributed, and the housing 51 is fixedly fastened to the lower end face of the base frame 413. The arc-shaped filter 52 is fixedly installed in the housing 51. The arc-shaped filter 52 of the filter assembly 5 can initially filter large particles, while the HEPA filter layer 53 can efficiently filter small particles and pathogens. The strip-shaped grooves 511 increase the area of ​​air entering the filter assembly 5, improving filtration efficiency and preventing large particles from entering the housing 51 and affecting the normal operation of the ventilation system. The housing 51 is fixedly fastened to the lower end face of the base frame 413, facilitating the installation and replacement of filter components.

[0050] Reference Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14The emergency window sealing assembly 6 includes an internal frame 61, a top winding roller 62, a bottom winding roller 63, a drive motor 64, and a window sealing cloth 65 for covering the positioning groove 201. The internal frame 61 is fixedly installed in the main cabinet 21. The top winding roller 62 is rotatably installed on the upper end of the internal frame 61, and the bottom winding roller 63 is rotatably installed on the lower end of the internal frame 61. The bottom winding roller 63 is connected to the top winding roller 62 via a synchronous belt 631. The drive motor 64 is fixedly installed in the main cabinet 21, and the output end of the drive motor 64 is fixedly connected to one end of the bottom winding roller 63. The lower end of the window sealing cloth 65 is wound on the bottom winding roller 63, and several pull ropes 651 are installed on the upper end of the window sealing cloth 65. One end of the pull rope 651 is wound on the top winding roller 62, and the lower end of the pull rope 651 is fixedly connected to the window sealing cloth 65. The emergency window sealing assembly 6 is designed with an internal frame 61, a top retractable roller 62, a bottom retractable roller 63, a drive motor 64, and a window sealing cloth 65 working together. During installation, the internal frame 61 serves as the main structure and is fixedly installed in the main cabinet 21. The top retractable roller 62 and the bottom retractable roller 63 are rotatably mounted at both ends of the internal frame 61 and connected to each other by a synchronous belt 631, ensuring that the top retractable roller 62 and the bottom retractable roller 63 can rotate synchronously. The window sealing cloth 65 is fitted against the inner side of the side cabinet panel 22 and can be rolled up by the bottom retractable roller 63. The emergency window sealing assembly 6 uses the drive motor 64 to drive the bottom retractable roller 63 to rotate, which in turn drives the top retractable roller 62 to rotate synchronously, thus realizing the unfolding and rolling up of the window sealing cloth 65. Under normal operating conditions, the sealing cloth 65 can be rolled up to ensure normal observation of the side panel 22. In emergencies, the sealing cloth 65 can be quickly unfolded to cover the positioning groove 201, and together with the elastic airbag pressure strip 614, a seal can be achieved, effectively preventing the leakage of bioaerosols. By installing a pull rope 651 at the upper end of the sealing cloth 65, it is easier to perform the winding operation through the top winding roller 62.

[0051] Reference Figure 2 , Figure 13 and Figure 14The internal frame 61 includes a middle frame shell 611, a top shaft bracket 612, and a bottom shaft bracket 613. The top shaft bracket 612 and the bottom shaft bracket 613 are respectively fixed to the upper and lower sides of the middle frame shell 611. An elastic airbag pressure strip 614 for pressing and sealing the window cloth 65 is embedded on the side of the middle frame shell 611 facing the side cabinet panel 22. A connecting air pipe 615 is provided on the elastic airbag pressure strip 614. The air supply component 7 includes a micro air pump 71 and a three-way valve 72. The micro air pump 71 is fixedly installed in the equipment base box 1. The outlet of the micro air pump 71 is connected to the air inlet of the three-way valve 72. The first air outlet and the second air outlet of the three-way valve 72 are respectively sealed and connected to the connecting air pipe 231 and the connecting air pipe 615. By adopting the above technical solution, the internal frame 61 is designed with a structure in which the middle frame shell 611, the top shaft bracket 612, and the bottom shaft bracket 613 cooperate. This ensures that the top winding roller 62 can be rotated and installed through the top shaft bracket 612 during use, while the bottom shaft bracket 613 ensures the stable rotation and installation of the bottom winding roller 63. The distance between the top winding roller 62 and the bottom shaft bracket 613 is stably controlled by the top shaft bracket 612 and the bottom shaft bracket 613, facilitating better coverage of the positioning groove 201 by the sealing cloth 65. The micro air pump 71 and the three-way valve 72 of the air supply component 7 cooperate to simultaneously supply air to the elastic airbag rubber strip 23 and the elastic airbag pressure strip 614, achieving rapid sealing of the side window and the sealing cloth 65. The elastic airbag pressure strip 614 holds the sealing cloth 65, further improving the sealing performance of the window.

[0052] The implementation principle of the biosafety fume hood with emergency sealing and purification functions in this embodiment is as follows: During normal operation, the operating window cover 20 is opened, allowing personnel to perform biological experiments inside the fume hood 2. The exhaust motor 42 starts, driving the exhaust impeller 43 to rotate, filtering the air inside the hood through the filter assembly 5 before exhausting it. The ultraviolet lamp assembly can be turned on as needed to disinfect the inside of the hood. When the negative pressure sensor detects an abnormal pressure inside the hood and determines that a bioaerosol leak may occur, the controller issues a command. First, check if there is a problem with the sealing of the side panel 22 (this can be done by installing differential pressure sensors or wind speed sensors around the positioning groove 201). If a breach in sealing is detected, the micro air pump 71 starts and inflates the elastic airbag strip 23 through the three-way valve 72. The elastic airbag strip 23 expands rapidly, quickly sealing the positioning groove 201. Then, check the sealing of the side panel 22 again. If the problem persists, the emergency window sealing assembly 6 needs to be activated. The drive motor 64 drives the top winding roller 62 and the bottom winding roller 63 to rotate synchronously, quickly unfolding the sealing cloth 65 rolled on the bottom winding roller 63 onto the inner side of the side panel 22. Then, the micro air pump 71 starts and supplies air to the elastic airbag pressure strip 614 through the three-way valve 72. The elastic airbag pressure strip 614 expands rapidly, pressing the sealing cloth 65 to seal it, thereby quickly sealing and blocking the positioning groove 201. The ultraviolet lamps are turned on to disinfect the inside of the cabinet, while the exhaust fan motor 42 continues to run, filtering the air inside the cabinet through the filter box 5 before expelling it, thus achieving in-situ purification.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biological safety fume hood with emergency sealing and purification function, comprising a device bottom box (1), characterized in that: An exhaust fan (2) is fixedly installed on the upper surface of the equipment base box (1). An operable operating window cover (20) is installed on the front end of the exhaust fan (2). Side window assemblies (3) are installed on both sides of the exhaust fan (2). The side window assemblies (3) are fixedly connected to the exhaust fan (2). An ultraviolet lamp assembly and a negative pressure sensor are fixedly installed on the inner side of the exhaust fan (2). A safety ventilation system (4) is also fixedly installed at the head of the exhaust fan (2). A filter box assembly (5) is fixedly installed at the lower end of the safety ventilation system (4). Two sets of emergency sealing window assemblies (6) are also installed on both sides inside the exhaust fan (2). The emergency sealing window assemblies (6) are fixedly connected to the exhaust fan (2). An air supply assembly (7) that cooperates with the emergency sealing window assembly (6) is also installed in the equipment base box (1).

2. The biosafety fume hood with emergency sealing and purification functions according to claim 1, characterized in that: The exhaust cabinet (2) includes a main cabinet (21) and a side cabinet panel (22). The side cabinet panel (22) is fixedly installed on both sides of the main cabinet (21), and a positioning groove (201) for installing the side window assembly (3) is provided on the side cabinet panel (22). An inner support frame (221) is fixedly installed in the positioning groove (201).

3. The biosafety fume hood with emergency sealing and purification functions according to claim 2, characterized in that: The positioning groove (201) of the side panel (22) is provided with an annular groove (222), and an elastic airbag strip (23) is embedded in the annular groove (222). The lower end of the elastic airbag strip (23) is provided with a connecting air pipe (231) connected to the air supply component (7), and the connecting air pipe (231) is sealed to the elastic airbag strip (23).

4. The biosafety fume hood with emergency sealing and purification functions according to claim 3, characterized in that: The side window assembly (3) includes a transparent window panel (31), a sealing ring (32), and an outer pressure frame assembly (33). The transparent window panel (31) is installed in the positioning groove (201) of the side cabinet panel (22). The sealing ring (32) is fitted and fixed to the edges on both sides of the transparent window panel (31). The outer pressure frame assembly (33) is pressed against the sealing ring (32) on the outside of the transparent window panel (31), and the outer pressure frame assembly (33) is fixedly connected to the side cabinet panel (22).

5. The biosafety fume hood with emergency sealing and purification functions according to claim 4, characterized in that: The outer pressure frame assembly (33) includes an outer support frame (331) and an outer ring plate (332). The outer support frame (331) is integrally formed and disposed on the inner side of the outer ring plate (332). The outer ring plate (332) has several sets of connection holes (333) that are connected to the side cabinet panel (22).

6. The biosafety fume hood with emergency sealing and purification functions according to claim 5, characterized in that: The safety ventilation system (4) includes a top cover (41), an exhaust motor (42) and an exhaust impeller (43). The top cover (41) is fixedly installed in the main cabinet (21). The exhaust motor (42) is configured as two sets, and the two sets of exhaust motors (42) are respectively fixedly installed on both sides of the top cover (41). The exhaust impeller (43) is sleeved and fixed on the output shaft of the exhaust motor (42).

7. The biosafety fume hood with emergency sealing and purification functions according to claim 6, characterized in that: The top cover (41) includes a main housing (411), an exhaust pipe (412), and a bottom frame (413) for the fixed installation of the exhaust fan motor (42). A partition block (414) is fixedly installed in the middle of the main housing (411). The partition block (414) divides the space in the main housing (411) into two sets of installation spaces for the installation of two sets of exhaust impellers (43). The exhaust pipe (412) is set into two sets, and the two sets of exhaust pipes (412) are fixed on both sides of the upper end face of the main housing (411). The bottom frame (413) is fixedly installed on the lower end face of the main housing (411). A one-way valve is also installed in the exhaust pipe (412).

8. The biosafety fume hood with emergency sealing and purification functions according to claim 7, characterized in that: The filter box assembly (5) includes a snap-on shell (51), an arc-shaped filter screen (52), and a HEPA filter layer (53) installed in the exhaust pipe (412). The snap-on shell (51) has several sets of strip grooves (511) evenly opened on its lower end face, and the snap-on shell (51) is snapped and fixed to the lower end face of the bottom frame (413). The arc-shaped filter screen (52) is fixedly installed in the snap-on shell (51).

9. The biosafety fume hood with emergency sealing and purification functions according to claim 8, characterized in that: The emergency window sealing assembly (6) includes an inner frame (61), a top winding roller (62), a bottom winding roller (63), a drive motor (64), and a window sealing cloth (65) for covering the positioning groove (201). The inner frame (61) is fixedly installed in the main cabinet (21). The top winding roller (62) is rotatably installed on the upper end of the inner frame (61), and the bottom winding roller (63) is rotatably installed on the lower end of the inner frame (61). The bottom winding roller (63) is connected by a synchronous belt. (631) is connected to the top winding roller (62). The drive motor (64) is fixedly installed in the main cabinet (21), and the output end of the drive motor (64) is fixedly connected to one end of the bottom winding roller (63). The lower end of the window covering (65) is wound on the bottom winding roller (63), and several pull ropes (651) are installed on the upper end of the window covering (65). One end of the pull rope (651) is wound on the top winding roller (62), and the lower end of the pull rope (651) is fixedly connected to the window covering (65).

10. The biosafety fume hood with emergency sealing and purification functions according to claim 9, characterized in that: The internal frame (61) includes a middle frame shell (611), a top shaft frame (612), and a bottom shaft frame (613). The top shaft frame (612) and the bottom shaft frame (613) are fixed on the upper and lower sides of the middle frame shell (611), respectively. An elastic airbag pressure strip (614) for pressing and sealing the window cloth (65) is embedded on the side of the middle frame shell (611) facing the side cabinet panel (22). A connecting air pipe (615) is provided on the elastic airbag pressure strip (614). The air supply component (7) includes a micro air pump (71) and a three-way valve (72). The micro air pump (71) is fixedly installed in the equipment base box (1). The outlet of the micro air pump (71) is connected to the air inlet of the three-way valve (72). The first air outlet and the second air outlet of the three-way valve (72) are respectively sealed to the connecting air pipe (231) and the connecting air pipe (615).

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