Airflow control type biological safety sampling pavilion

Abstract

The utility model discloses an airflow control type biological safety sampling pavilion which comprises a main frame, a light wall plate, an open sampling window, a handrail plate, a sinking airflow hole, a sinking airflow box, a pipeline, an exhaust fan, a high-efficiency filter and an air circulation filtering chamber, the sampling pavilion is defined by the main frame and the light wall plate, and the open sampling window is arranged on the sampling pavilion; a handrail plate is arranged at the lower part of the sampling window; a sinking airflow hole is formed in the handrail plate; sinking airflow boxes are transversely arranged below the armrest plate, and air in the sinking airflow boxes is pumped into the pipeline through an exhaust fan; the sampling pavilion top is provided with an air circulation filter chamber, the upper end of the pipeline is communicated with the air circulation filter chamber, and the bottom of the air circulation filter chamber is provided with a high-efficiency filter. The utility model has the innovation points that the open-type sampling window is arranged and airflow control is adopted, so that sampling personnel are prevented from being infected, the operation is convenient and accurate, and meanwhile, the sampled personnel are better protected from cross infection.

Description

Technical Field

[0001] The utility model belongs to the field of medical technology, and particularly relates to an airflow-controlled biosafety sampling booth. Background Art

[0002] Currently, mobile sampling booths are widely used for virus throat swab sampling. The main design route is basically to use closed perspective glass and isolated glove tubes. However, this design exposes many very serious safety and quality problems in actual application:

[0003] 1. Cross infection is prone to occur: Due to the isolation of the transparent glass and the glove tube, the sampler is completely separated from the outside of the sampling booth, which leads to:

[0004] ① After the sampler has collected the sample and folded the swab head and put it into the sampling tube, the remaining swab rod will be thrown into the trash can outside the pavilion, next to the person being sampled. Since the swab rod has penetrated into the mouth of the person being sampled, it is entirely possible that it is contaminated with the virus; in addition, the person being sampled may also throw the used tissues for wiping saliva or snot into the trash can, and these tissues may also contain the virus. This trash can is open throughout the sampling process, and the person being sampled is right next to this trash can, and the person being sampled is still taking off the mask at the time. This means that the virus aerosol that may exist in the trash can will float out, causing the person being sampled to inhale the virus aerosol at close range, causing the person being sampled to be infected with the virus.

[0005] ② The sampling swabs to be unpacked and used are placed on the small table outside the sampling booth, which is just within the coverage range of the exhaled breath and saliva of the sampled person. The risk of the sampling swab being contaminated by an accidental virus-infected person is very high. If the contaminated swab is placed in the mouth of a healthy sampled person, it may cause the sampled person to be infected with the virus.

[0006] ③Since the sampled personnel are close to the sampling booth for sampling, if they encounter a virus-infected person for sampling, the outer surface of the sampling booth near the glove tube will definitely be contaminated by their breath and saliva. Except for the front end of the gloves, which is disinfected after each sampling, other places are not disinfected or inconvenient to disinfect. When the next sampled person approaches for sampling, he or she may be infected by the virus aerosol that falls from this part of the contaminated outer surface.

[0007] ④ The sample tubes and test tube racks with collected swabs are usually placed on the small table outside the sampling booth. Since virus samples may be collected, the outer surfaces of the test tubes and test tube racks may be contaminated by spilled viruses. In addition, since the test tubes and test tube racks are placed in front of the person being sampled, there is also contamination from aerosols exhaled and droplets exhaled by the virus-infected person. When the person being sampled later moves into these contaminated test tubes and test tube racks, there is a risk of infection.

[0008] 2. The virus cannot be collected: The standard throat swab sampling is to quickly insert the swab into the mouth and wipe back and forth on the tonsils on both sides at least 3 times, and then probe inside and wipe up and down the posterior pharyngeal wall at least 3 times; however, due to the limitation of two small glove holes, and the thicker and harder rubber gloves connected to the glove holes, the sampler's vision, feel and hand flexibility are affected, which can easily lead to non-standard and inadequate sampling movements, resulting in the failure to collect the necessary viruses.

[0009] In response to the above problems, it is urgent to design a new type of nucleic acid sampling booth that can protect samplers from infection and protect sampled persons from cross-infection, while improving the flexibility and accuracy of pharyngeal swab sampling. Utility Model Content

[0010] In view of the above-mentioned deficiencies in the prior art, the utility model invents an airflow-controlled biosafety sampling booth.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] An airflow-controlled biosafety sampling booth, comprising a main frame, a light wall panel, an open sampling window, a handrail, a downdraft hole, a downdraft box, a pipeline, an exhaust fan, a high-efficiency filter and an air circulation filter chamber. The sampling booth is surrounded by the main frame and the light wall panel to form a closed internal activity area for sampling personnel, and an open sampling window is arranged on one or two sides of the sampling booth; a handrail is arranged under the open sampling window, and the position of the handrail coincides with the bottom edge of the open sampling window; a downdraft box is arranged horizontally under the handrail; the handrail The width of the board and the downdraft box is the same as the width of the open sampling window; the armrest board is arranged in an array and is covered with downdraft holes; the downdraft box draws the air therein into the pipeline through the exhaust fan, and when the exhaust fan is working, downdraft will be generated on the armrest board; an air circulation filter chamber is arranged on the top of the sampling booth, and the air outlet of the pipeline is connected to the air circulation filter chamber, and a high-efficiency filter is arranged at the bottom of the air circulation filter chamber to provide safe and fresh air to the interior of the sampling booth, and the air outlet of the high-efficiency filter is located above the open sampling window.

[0013] The innovation of the utility model is that the sampling booth adopts an open sampling window. The open sampling window forms a directional airflow blockage on the sampling window through the positive pressure airflow formed inside the sampling booth and the negative pressure airflow formed by the downward airflow hole, which not only prevents the pathogen aerosol outside the sampling window from entering the sampling booth, but also prevents the pathogen aerosol in the open trash can from escaping due to the negative pressure effect; the sampling swab and the collected test tube are moved into the negative pressure airflow control area in the sampling booth and placed, which can prevent these sampling tools from being contaminated by the sampled personnel, and can also suck away the pathogens that may contaminate them through the pipeline. In addition, since the sampling personnel do not need to wear heavy gloves, the arm movement is freed from the restriction of two narrow glove holes, and is replaced by a sampling window with a wider arm movement space, making the line of sight clearer, the arm movement more flexible, and the swab touch feeling more sensitive.

[0014] Furthermore, the cross-section of the downdraft box is a trumpet shape that is wide at the top and narrow at the bottom. The width of the upper part is mainly to form a wide range of downdraft curtains with the downdraft holes on the armrest, so as to effectively block the airflow of the open sampling window. The open sampling window is installed on the horizontal center line of the armrest, that is, half of the longitudinal length of the armrest is inside the sampling booth, and the other half is outside the sampling booth; the height of the open sampling window is 18.0-30.0cm. If the height of the open sampling window is too short, it will affect the operation of the sampling personnel's hands. If the height is too high, it will affect the blocking effect of the downdraft.

[0015] Furthermore, it also includes an exhaust fan installation cabinet and a trash can. The trash can and the exhaust fan installation cabinet are fixedly installed on the left and right sides of the downward airflow box. The top surfaces of the exhaust fan installation cabinet and the trash can are flush with the top surface of the handrail board; the exhaust fan is fixedly installed in the exhaust fan installation cabinet.

[0016] Furthermore, the trash bin and the exhaust fan installation cabinet are arranged to protrude outside the sampling booth. The trash bin and the garbage inlet are designed to face outwards. In addition to avoiding occupying the space inside the sampling booth, the garbage inlet outside the booth is also convenient for the samplers and the sampled persons to throw away the garbage, and can also reduce the risk of accidental overflow of viral aerosols in the trash bin and accumulation in the booth. The convex top surface of the exhaust fan installation cabinet can be used to place items with low cross-infection risks, such as alcohol spray bottles, paper towels and other items.

[0017] Furthermore, the trash bin is provided with a garbage inlet, a trash can rack and a door; the top surface of the trash bin is provided with a garbage inlet, and the position of the garbage inlet is within the width range of the open sampling window, that is, the width range of the trash bin and the width range of the open sampling window overlap in part, so as to facilitate the sampler's arm to get close to the garbage inlet to throw garbage; a trash can rack is suspended in the trash bin, and the suspended setting is to form a negative pressure airflow cover around the garbage inlet and the trash bin to prevent virus aerosols in the trash can from escaping from the garbage inlet; the outside of the trash bin is provided with a door that can be closed tightly, so as to form a sealed space for the trash bin that can only inhale air from the garbage inlet.

[0018] Furthermore, it also includes an internal circulation vent. The downward airflow box is located in the middle or lower part of the inner surface of the sampling booth and is provided with an internal circulation vent, which can not only realize the internal circulation of the airflow inside the sampling booth, but also can limit the inhalation and filtration of the pathogen aerosol that escapes into the sampling booth from the vicinity of the open sampling window.

[0019] Furthermore, it also includes an air duct and a loading plate, the top surface of the exhaust fan installation cabinet is extended toward the inside of the pavilion and is provided with a loading plate, and the loading plate is densely provided with downdraft holes; the exhaust fan extracts the air from the downdraft box and the air in each area inside the trash bin into the pipeline through the air duct; the air duct includes a main pipe, a first branch pipe bell mouth, a second branch pipe bell mouth and a third branch pipe bell mouth, the main pipe is connected and installed on the air inlet of the exhaust fan, and the main pipe is connected and provided with a first branch pipe bell mouth, a second branch pipe bell mouth and a third branch pipe bell mouth; the first branch pipe bell mouth is directly connected to the bottom of the loading plate, and a downdraft is generated on the loading plate, and the loading plate can be used to safely place items such as sampling swabs, test tubes, and test tube racks; the second branch pipe bell mouth is arranged at the bottom of the downdraft box for extracting the air in the downdraft box; the third branch pipe bell mouth is arranged at the bottom of the trash bin for extracting the air from the upper part of the trash bin; the downdraft box and the trash bin are isolated from each other except that the air duct is connected.

[0020] Furthermore, it also includes an air-conditioned indoor unit, adjustable supporting feet, a hook and a forklift slot. The air-conditioned indoor unit is arranged inside the sampling booth, and the wall on which the air-conditioned indoor unit is installed is opposite to the wall on which the open sampling window is arranged, so as to increase the internal positive pressure of the open sampling window and further prevent the external airflow carrying pathogens from entering the sampling booth; the adjustable supporting feet are arranged at the bottom of the sampling booth, the hook is arranged at the top of the sampling booth, and the forklift slot is arranged at the lower part of the main frame.

[0021] Furthermore, it also includes primary and secondary filters. The air circulation filter chamber is detachably provided with primary and secondary filters, and the primary and secondary filters are installed near the air outlet of the pipeline. The air entering the air circulation filter chamber is first subjected to primary and secondary filtration, and the large and larger dust therein is filtered and intercepted to reduce the filtration pressure of the high-efficiency filter and extend its service life.

[0022] Furthermore, an ultraviolet lamp is arranged inside the air circulation filter chamber, and the inside of the air circulation filter chamber can be disinfected by ultraviolet irradiation after or during work to reduce or eliminate germs in the filter chamber and on the filter.

[0023] The advantages of the utility model are: 1. The sampling booth adopts a main frame and light wall panel design, which is sturdy and durable as a whole, and is also convenient to carry and install; 2. The open sampling window adopts a downdraft air curtain and a positive pressure airflow inside the sampling booth for protection and blocking. The sampling personnel only need to wear the protective equipment of the secondary biosafety laboratory to perform safe sampling operations. The sampling process is no longer restricted by the glove holes and glove tubes. The two-handed operation is more flexible, the swab feels better, and the sampling field of view is wider and clearer; 3. The air inside the sampling booth is circulated in a biosafety manner through the downdraft holes, the lower vents, the exhaust fan, the pipeline, the air circulation filter chamber, and the high-efficiency filter, and the sampling personnel can The air conditioning energy saving in the booth is maximized; 4. Pathogens that accidentally enter the sampling booth can also be quickly and effectively brought into the high-efficiency filter by the indoor circulating air and filtered out; 5. The trash can is sealed with downward airflow, so that the pathogens carried on the garbage thrown into the trash can will not float out of the trash can, thereby protecting the sampled personnel who are close to the open trash can from cross infection; 5. The sampling swabs and test tube racks are moved to the storage rack in the sampling booth and placed on it, which not only prevents them from being contaminated by the pathogenic aerosols exhaled or spit out by the sampled person, but also can blow the pathogens that may be contaminated on them into the suction filter system for removal, while also making it convenient for the samplers to take them in the sampling booth. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of an airflow-controlled biosafety sampling booth of the utility model;

[0025] Figure 2 It is a top view of an airflow-controlled biosafety sampling booth of the utility model;

[0026] Figure 3 yes Figure 3 Cross-section of the middle AA;

[0027] Figure 4 It is a three-dimensional diagram of a downdraft box, an air guide box and a garbage bin in an airflow-controlled biosafety sampling booth of the utility model;

[0028] Figure 5 It is a three-dimensional diagram of the handrail board and the loading board in an airflow control type biosafety sampling booth of the utility model;

[0029] Figure 6 The utility model is a schematic structural diagram of the connection between an air duct and an exhaust fan in an airflow-controlled biosafety sampling booth. DETAILED DESCRIPTION

[0030] The utility model is described in detail below with reference to the accompanying drawings:

[0031] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "front", "rear", "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0032] Embodiment 1

[0033] like Figure 1-3As shown, an airflow-controlled biosafety sampling booth includes a main frame 1, a light wall panel 2, an open sampling window 3, a handrail 4, a downdraft hole 5, a downdraft box 6, a pipeline 8, an exhaust fan 9, a high-efficiency filter 10 and an air circulation filter chamber 11. The sampling booth is surrounded by the main frame 1 and the light wall panel 2 to form a closed internal activity area for sampling personnel. An open sampling window 3 is set on one of the sides of the sampling booth. The open sampling window 3 is a rectangular window cut out from a transparent glass wall. A handrail 4 is set under the open sampling window 3. The open sampling window 3 is installed on the horizontal midline of the handrail 4. The position of the handrail 4 coincides with the bottom edge of the open sampling window 3, that is, the bottom edge of the open sampling window 3 is mounted on the handrail 4, and the width of the open sampling window 3 is the same as the horizontal width of the handrail 4. The height of the open sampling window 3 is 18.0-30.0cm. A downdraft box 6 is disposed transversely at the bottom of the handrail 4, and the top of the downdraft box 6 is open and not closed; the cross section of the downdraft box 6 is a trumpet shape that is wide at the top and narrow at the bottom, the width of the handrail 4 is the same as the upper part of the downdraft box 6, and the longitudinal length of the handrail 4 is the same as the longitudinal length of the trumpet mouth at the top of the downdraft box 6. The area between the left and right sides of the downdraft box 6 and the main frame 1 is blocked by a lightweight wallboard 2. The handrail 4 is arrayed with downdraft holes 5, and the distribution area of ​​the downdraft holes 5 needs to cover the width range of the open sampling window 3 to ensure that the wind curtain formed by the generated downdraft can completely block the sampling window; when designing the downdraft holes 5, a hole needs to be staggered between rows. The diameter of the downdraft holes 5 is 3 to 8 mm, and the gap between the through holes is 2 to 5 mm.

[0034] The air in the downdraft box 6 is drawn out by the exhaust fan 9 and enters the pipe 8. The air outlet of the exhaust fan 9 is connected to the pipe 8. When the exhaust fan 9 is working, the air in the downdraft box 6 will be drawn out, and a negative pressure will be formed inside after the air is drawn out. The external air will enter the downdraft box 6 through the downdraft hole 5, and then a downdraft curtain will be generated from top to bottom on the handrail 4. An air circulation filter chamber 11 is arranged on the top of the sampling booth. The air outlet of the pipe 8 is connected to the air circulation filter chamber 11. The air drawn out by the exhaust fan 9 will enter the air circulation filter chamber 11 through the pipe 8. A high-efficiency filter 10 is arranged at the bottom of the air circulation filter chamber 11 to provide safe and fresh air for the interior of the sampling booth. Only filtered safe air can enter the sampling booth. The high-efficiency filter 10 is located above the open sampling window 3, that is, the installation position of the air outlet of the high-efficiency filter 10 is located on the top of the inside of the sampling booth and is directly above the open sampling window 3; the width of the high-efficiency filter 10 is the same as the width of the open sampling window 3, and the gas blown downward can help form a positive pressure airflow curtain to seal the sampling window.

[0035] Embodiment 2

[0036] The difference between the second embodiment and the first embodiment is that it also includes an exhaust fan installation cabinet 7, a trash bin 13, circulation vents 16 in the booth, an air duct 17 and a loading plate 23. The trash bin 13 and the exhaust fan installation cabinet 7 are respectively provided on the left and right sides of the downward airflow box 6; the top surfaces of the trash bin 13 and the exhaust fan installation cabinet 7 are flush with the top surface of the handrail 4. The trash bin 13 and the exhaust fan installation cabinet 7 are protruding outward from the sampling booth, and the overall appearance is symmetrical and beautiful. The exhaust fan 9 is installed in the exhaust fan installation cabinet 7. The top surface of the exhaust fan installation cabinet 7 is extended inwardly to provide a loading plate 23, and the loading plate 23 is densely covered with downward airflow holes 5. Sampling swabs, test tubes, test tube racks, etc. that are often used for sampling can be placed on the loading plate 23. In order to prevent the pathogen aerosol from accidentally breaking through the open sampling window 3 and entering the sampling booth, a booth circulation vent 16 is provided in the middle or lower part of the downdraft box 6 on the inner surface of the sampling booth; the aperture of the booth circulation vent 16 is 5-10 mm, and 2-3 rows are provided. The booth circulation vent 16 is used to extract the air in the lower layer of the sampling booth so that the internal air can be circulated.

[0037] The trash bin 13 is provided with a trash inlet 12, a trash can rack 14 and a door 15. The trash inlet 12 is provided on the top of the trash bin 13. The position of the trash inlet 12 is within the width range of the open sampling window 3, that is, the width range of the trash bin 13 partially overlaps with the width range of the open sampling window 3. This design makes it convenient for sampling personnel to throw trash directly into the trash bin, and the sampling window does not need to be set too wide. A trash can rack 14 is suspended in the trash bin 13; a door 15 that can be closed is provided on the outside of the trash bin 13.

[0038] An air duct 17 is provided between the exhaust fan installation cabinet 7, the trash bin 13 and the downdraft box 6. The exhaust fan 9 draws air from various areas inside the downdraft box 6 and the trash bin 13 into the duct 8 through the air duct 17. The exhaust fan 9 is fixedly installed at the bottom of the exhaust fan installation cabinet 7. Figure 6As shown, the air guide 17 is composed of a main pipe 171, a first branch pipe bell mouth 172, a second branch pipe bell mouth 173 and a third branch pipe bell mouth 174. The main pipe 171 is connected and installed on the air inlet of the exhaust fan 9. The main pipe 171 is provided with a first branch pipe bell mouth 172, a second branch pipe bell mouth 173 and a third branch pipe bell mouth 174; the first branch pipe bell mouth 172 is directly connected to the bottom of the carrier plate 23. When the exhaust fan 9 is working, a downdraft will be generated on the carrier plate 23, so that the items placed thereon (such as sampling swabs, sampling tubes, test tube racks, etc.) are protected by the airflow, and the downdraft will take away the aerosol or germs adhering thereto. The second branch pipe bell mouth 173 is arranged at the bottom position of the downdraft box 6, and is used to extract the air in the downdraft box 6. In order to ensure that the air inside the downdraft box 6 is smoothly extracted and does not interfere with each other, two branch pipe bell mouths can be set inside the downdraft box 6, one of which is set upwards to extract the air of the downdraft, and the other is set downwards to extract the air of the inner circulation airflow. When setting, the downdraft box 6 needs to be divided into two parts, upper and lower, to avoid the extraction of the upper and lower parts of the air from interfering with each other when extracting the air. The third branch pipe bell mouth 174 is set at the bottom of the garbage bin 13, to extract the air on the upper part of the garbage bin 13, so that the garbage bin 13 also produces a downdraft, ensuring that the bacteria or aerosols produced by the garbage thrown into the garbage bin cannot run out to infect the sampled person or be directly extracted. In the actual design, the pipeline (main pipe and branch pipe) on the air guide 17 can be bent according to the position of the downdraft box, the garbage bin, the loading plate and the exhaust fan, or a multi-section pipeline can be used to achieve the purpose, and it is only necessary to meet the requirements that each bell mouth can be connected to the exhaust fan through a pipeline after installation.

[0039] In order to improve the function of the sampling booth, an air-conditioning indoor unit 18, an adjustable support foot 19, a hook 20, a forklift slot 21 and a primary and secondary filter 22 are also provided. The sampling booth is provided with an air-conditioning indoor unit 18, and the wall on which the air-conditioning indoor unit 18 is installed is opposite to the open sampling window 3. The air-conditioning indoor unit mentioned here is the indoor unit, and the outdoor unit is installed outside the sampling booth; the adjustable support foot 19 is arranged at the bottom of the sampling booth, which is convenient for installation and level adjustment; the hook 20 is arranged at the top of the sampling booth, and the forklift slot 21 is arranged at the lower part of the main frame 1. The hook 20 and the forklift slot 21 are convenient for carrying and moving the sampling booth. A primary and secondary filter 22 is detachably provided in the air circulation filter chamber 11, and the primary and secondary filter 22 is installed near the air outlet of the pipe 8. In order to disinfect the aerosol or germs filtered on the high-level filter 10 and the primary and secondary filter 22, an ultraviolet lamp is arranged inside the air circulation filter chamber 11.

[0040] The sampling window and garbage inlet of the sampling booth are both open-type designs. Through the biosafety positive pressure airflow set inside the sampling booth and the downdraft of the open sampling window and the garbage inlet, an effective biosafety airflow blockage is formed for the open sampling window and the garbage inlet, which allows the sampling personnel to get rid of the spatial isolation and displacement restrictions of the fixed glove holes, improve the visual observation effect and eliminate the restrictions of poor hand flexibility, and can also safely separate the sampling waste bin from the sampled person, and can also realize the frequent disinfection of the hands of the sampling personnel easily and conveniently, and the sampling swab is convenient to use under safety protection. The positive pressure gas inside the sampling booth mainly comes from the high-efficiency filter 10 and the air conditioner indoor unit 18, and the inhaled air in the air circulation filter chamber 11 mainly comes from the downdraft hole 5, the garbage inlet 12, the carrier plate 23 and the circulation vent 16 in the booth. The open sampling window 3 is blocked by two air walls, one of which is the negative pressure wind curtain generated by the downdraft box 6, and the other is the positive pressure airflow blown down by the high-efficiency filter 10.

[0041] The technical solution provided in this embodiment is a creative technical point. Technical points without creativity or the same as the prior art are not described, such as the installation or design of the registration system, monitoring system, lighting, air conditioning host, placement of paper towels, doors, etc.; when designing the airflow channel, rounded pipes are used at the corners to reduce the resistance of airflow turning. At the same time, the sampling booth of this embodiment can also be designed with two open sampling windows at the same time, and except for the open sampling windows, the rest of the places are sealed.

[0042] Although the specific embodiments of the present invention have been described and illustrated in detail above, it should be noted that various changes and modifications may be made to the above embodiments without departing from the spirit of the present invention and the scope of the appended claims.

Claims

1. An airflow-controlled biosafety sampling booth, characterized in that: The sampling booth comprises a main frame (1), a lightweight wall panel (2), an open sampling window (3), a handrail (4), a downdraft hole (5), a downdraft box (6), a pipeline (8), an exhaust fan (9), a high-efficiency filter (10) and an air circulation filter chamber (11). The sampling booth is surrounded by the main frame (1) and the lightweight wall panel (2) to form a closed internal activity area for sampling personnel. An open sampling window (3) is arranged on one or two sides of the sampling booth; a handrail (4) is arranged under the open sampling window (3), and the position of the handrail (4) coincides with the bottom edge of the open sampling window (3); a downdraft box (6) is arranged horizontally under the handrail (4) ; The width of the armrest (4) and the downdraft box (6) is the same as the width of the open sampling window (3); the armrest (4) is provided with an array of downdraft holes (5); the downdraft box (6) draws air from the inside thereof into the pipe (8) through an exhaust fan (9); an air circulation filter chamber (11) is provided on the top of the sampling booth, the air outlet of the pipe (8) is connected to the air circulation filter chamber (11), and a high-efficiency filter (10) is provided at the bottom of the air circulation filter chamber (11) for providing safe and fresh air to the interior of the sampling booth, and the air outlet of the high-efficiency filter (10) is located above the open sampling window (3).

2. The airflow-controlled biosafety sampling booth according to claim 1, characterized in that: The cross section of the downdraft box (6) is a trumpet shape that is wide at the top and narrow at the bottom; the open sampling window (3) is installed on the horizontal center line of the handrail board (4); the height of the open sampling window (3) is 18.0-30.0 cm.

3. The airflow-controlled biosafety sampling booth according to claim 2, characterized in that: It also includes an exhaust fan installation cabinet (7) and a trash bin (13), wherein the trash bin (13) and the fan installation cabinet (7) are fixedly arranged on the left and right sides of the downdraft box (6), and the top surfaces of the exhaust fan installation cabinet (7) and the trash bin (13) are flush with the top surface of the handrail board (4); the exhaust fan (9) is fixedly installed in the exhaust fan installation cabinet (7).

4. The airflow-controlled biosafety sampling booth according to claim 3, characterized in that: The trash bin (13) and the exhaust fan installation cabinet (7) are arranged to protrude outside the sampling booth.

5. The airflow-controlled biosafety sampling booth according to claim 4, characterized in that: The trash bin (13) is provided with a trash inlet (12), a trash can rack (14) and a door (15); the top surface of the trash bin (13) is provided with a trash inlet (12), and the position of the trash inlet (12) is within the width range of the open sampling window (3); a trash can rack (14) is suspended in the trash bin (13); and a door (15) that can be closed is provided on the outside of the trash bin (13).

6. An airflow-controlled biosafety sampling booth according to any one of claims 1 to 5, characterized in that: It also includes an in-booth circulation vent (16), and the downdraft box (6) is located in the middle or lower part of the inner surface of the sampling booth and is provided with an in-booth circulation vent (16).

7. The airflow-controlled biosafety sampling booth according to claim 4, characterized in that: It also includes an air guide duct (17) and a loading plate (23); the loading plate (23) is provided on the top surface of the exhaust fan installation cabinet (7) extending inward, and the loading plate (23) is densely provided with downward airflow holes (5); the exhaust fan (9) draws air from various areas inside the downward airflow box (6) and the garbage bin (13) into the pipeline (8) through the air guide duct (17); the air guide duct (17) is composed of a main pipe (171), a first branch pipe bell mouth (172), a second branch pipe bell mouth (173) and a third branch pipe bell mouth (174); the main pipe (171) is provided with a first branch pipe bell mouth (172), a second branch pipe bell mouth (173) and a third branch pipe bell mouth (174); the first branch pipe bell mouth ... 71) is connected and installed on the air inlet of the exhaust fan (9), and the main pipe (171) is provided with a first branch pipe bell mouth (172), a second branch pipe bell mouth (173) and a third branch pipe bell mouth (174); the first branch pipe bell mouth (172) is directly connected to the bottom of the carrier plate (23); the second branch pipe bell mouth (173) is arranged at the bottom of the downdraft box (6) for extracting air in the downdraft box (6); the third branch pipe bell mouth (174) is arranged at the bottom of the garbage bin (13) for extracting air from the upper part of the garbage bin (13).

8. The airflow-controlled biosafety sampling booth according to claim 7, characterized in that: It also includes an air-conditioning indoor unit (18), an adjustment support foot (19), a hook (20) and a forklift slot (21). The sampling booth is provided with an air-conditioning indoor unit (18) inside, and the wall on which the air-conditioning indoor unit (18) is installed is opposite to the wall on which the open sampling window (3) is provided; the adjustment support foot (19) is provided at the bottom of the sampling booth; the hook (20) is provided at the top of the sampling booth; and the forklift slot (21) is provided at the lower part of the main frame (1).

9. The airflow-controlled biosafety sampling booth according to claim 8, characterized in that: It also includes a primary and secondary filter (22), wherein the air circulation filter chamber (11) is detachably provided with the primary and secondary filter (22), and the primary and secondary filter (22) is installed at a position close to the air outlet of the duct (8).

10. The airflow-controlled biosafety sampling booth according to claim 9, characterized in that: An ultraviolet lamp is arranged inside the air circulation filter chamber (11).

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