Biological safety cabinet

Abstract

The application belongs to the technical field of medical apparatus and instruments, and particularly relates to a biological safety cabinet. The application aims to solve the problem of low strength of a surrounding plate in a related biological safety cabinet. The biological safety cabinet of the application is provided with a first reinforcing rib and a second reinforcing rib on the inner side of the rear end of an outer shell body. The first reinforcing rib and the second reinforcing rib are both arranged obliquely relative to the vertical direction. The top ends of the first reinforcing rib and the second reinforcing rib are both located below the projection of a fan on the outer shell body. The bottom ends of the first reinforcing rib and the second reinforcing rib are mutually divergent and extend obliquely downward. Through the above arrangement, the first reinforcing rib and the second reinforcing rib are both arranged obliquely relative to the vertical direction, so as to guide the air flowing upward along the inner side of the rear end of the outer shell body towards the fan, thereby making the reinforcing assembly not only strengthen the structural strength of the outer shell body, but also guide the airflow in the air duct towards the fan, so that the air flow rate of the biological safety cabinet is improved, thereby improving the air purification efficiency of the biological safety cabinet.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application belongs to the technical field of medical instruments, and particularly relates to a biological safety cabinet. BACKGROUND

[0002] The biological safety cabinet is designed for protecting the operator, the laboratory environment and the experimental materials from the infectious aerosols and splashes that may be generated in the operation process when operating the primary culture, the virus strain and the diagnostic specimen.

[0003] In the related art, the biological safety cabinet comprises a cabinet body, the cabinet body comprises a surrounding plate, a top plate and a bottom plate, the top plate is arranged at the top of the surrounding plate, the bottom plate is arranged at the bottom of the surrounding plate, and the top plate, the surrounding plate and the bottom plate are arranged to form the cabinet body.

[0004] However, the strength of the surrounding plate in the related biological safety cabinet is low, so that the surrounding plate is prone to deformation in the process of moving or transporting the biological safety cabinet. SUMMARY

[0005] The main purpose of the embodiment of the present application is to provide a biological safety cabinet to solve the problem of low strength of the surrounding plate in the related biological safety cabinet.

[0006] To achieve the above-mentioned purpose, the embodiment of the present application provides a biological safety cabinet, which comprises a cabinet body and a fan, the cabinet body comprises an inner shell and an outer shell sleeved outside the inner shell, the inner shell has a working chamber inside, the front end of the outer shell is provided with an operation window, the operation window is in communication with the working chamber, a purification chamber is formed between the top end of the inner shell and the outer shell, the fan is arranged in the purification chamber, a wind channel is formed between the side of the inner shell away from the operation window and the outer shell, the bottom end of the wind channel is in communication with the working chamber, the top end of the wind channel is in communication with the purification chamber, the inner side of the rear end of the outer shell is provided with a reinforcing assembly, the reinforcing assembly comprises a first reinforcing assembly, the first reinforcing assembly comprises a first reinforcing rib and a second reinforcing rib, the first reinforcing rib and the second reinforcing rib are both arranged obliquely relative to the vertical direction, the top end of the first reinforcing rib and the second reinforcing rib are both located below the projection of the fan on the outer shell, and the bottom end of the first reinforcing rib and the second reinforcing rib extend downward and away from each other.

[0007] In the preferred technical solution of the above-mentioned biological safety cabinet, the cross section of the first reinforcing rib and the second reinforcing rib is triangular.

[0008] In the preferred technical solution of the above-mentioned biological safety cabinet, the first reinforcing assembly further comprises a third reinforcing rib, the third reinforcing rib extends along the vertical direction, and the third reinforcing rib is arranged between the first reinforcing rib and the second reinforcing rib.

[0009] In the preferred technical scheme of the biological safety cabinet, the fan is multiple, and the multiple fans are arranged at intervals along the length direction of the cabinet body; the first reinforcing component is multiple, and each first reinforcing component corresponds to one fan.

[0010] In the preferred technical scheme of the biological safety cabinet, the reinforcing component further comprises a second reinforcing component, the second reinforcing component extends along the vertical direction, and the second reinforcing component is arranged between two adjacent first reinforcing components.

[0011] In the preferred technical scheme of the biological safety cabinet, the second reinforcing component comprises a fourth reinforcing rib and a fifth reinforcing rib, the fourth reinforcing rib and the fifth reinforcing rib both extend along the vertical direction, and the cross sections of the fourth reinforcing rib and the fifth reinforcing rib are both triangular.

[0012] In the preferred technical scheme of the biological safety cabinet, the fan is an exhaust fan, and the inlet of the exhaust fan faces the inner side of the rear end of the outer shell;

[0013] The biological safety cabinet further comprises a supply air filter, a supply air fan, an exhaust filter and an exhaust pipe, the purification chamber comprises an exhaust chamber and a supply air chamber which are separated from each other, the exhaust chamber is arranged close to the air duct, the outer shell is provided with a supply air outlet and an exhaust outlet, the supply air outlet communicates with the supply air chamber, the first control valve is arranged at the supply air outlet, the supply air filter and the supply air fan are both arranged in the supply air chamber, and the supply air chamber communicates with the working chamber; the exhaust outlet communicates with the exhaust chamber, and the exhaust filter and the exhaust fan are both arranged in the exhaust chamber; the exhaust chamber and the supply air chamber are connected through a pipeline, the second control valve is arranged on the pipeline; the exhaust pipe is arranged outside the cabinet body, the exhaust pipe communicates with the exhaust outlet, and the third control valve is arranged on the exhaust pipe.

[0014] In the preferred technical scheme of the biological safety cabinet, the exhaust pipe is further connected with an exhaust branch pipe, the exhaust branch pipe is located between the exhaust outlet and the third control valve, the end of the exhaust branch pipe is configured to communicate with the indoor environment outside the cabinet body, the fourth control valve is arranged on the exhaust branch pipe, and the end of the exhaust pipe is configured to communicate with the outdoor environment.

[0015] In the preferred technical scheme of the biological safety cabinet, the biological safety cabinet further comprises an external exhaust fan, and the external exhaust fan is arranged at the end of the exhaust pipe.

[0016] In the preferred technical scheme of the biological safety cabinet, the supply air outlet and the exhaust outlet are both arranged at the top of the outer shell.

[0017] The skilled in the art can understand that the biological safety cabinet of the embodiment of the application comprises a cabinet body, a fan comprising the cabinet body and the fan, the cabinet body comprising an inner shell and an outer shell, the inner shell having a working chamber therein, the front end of the outer shell being provided with an operation window, the operation window being communicated with the working chamber; a purification chamber being formed between the top end of the inner shell and the outer shell, the fan being arranged in the purification chamber, a duct being formed between the side of the inner shell away from the operation window and the outer shell, the bottom end of the duct being communicated with the working chamber, the top end of the duct being communicated with the purification chamber; a reinforcing assembly being arranged on the inner side of the rear end of the outer shell, the reinforcing assembly comprising a first reinforcing assembly, the first reinforcing assembly comprising a first reinforcing rib and a second reinforcing rib, the first reinforcing rib and the second reinforcing rib being arranged obliquely relative to the vertical direction, the top end of the first reinforcing rib and the second reinforcing rib being located below the projection of the fan on the outer shell, the bottom end of the first reinforcing rib and the second reinforcing rib being mutually away and extending downwardly obliquely. Through the above arrangement, the first reinforcing rib and the second reinforcing rib are arranged obliquely relative to the vertical direction to guide the air flowing upwardly along the inner side of the rear end of the outer shell toward the fan, so that the reinforcing assembly can not only strengthen the structural strength of the outer shell, but also make the outer shell not easy to be deformed during the moving or transporting of the biological safety cabinet; the first reinforcing rib and the second reinforcing rib can also guide the airflow in the duct toward the fan, so that the air circulation rate of the biological safety cabinet is improved, thereby improving the air purification efficiency of the biological safety cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0018] The preferred embodiments of the biological safety cabinet of the application will be described below with reference to the accompanying drawings. The drawings are as follows:

[0019] Figure 1 is a structural schematic diagram of the biological safety cabinet of the embodiment of the application Figure 1 ;

[0020] Figure 2 is a structural schematic diagram of the biological safety cabinet of the embodiment of the application Figure 2 ;

[0021] Figure 3 is a sectional view in A-A direction of Figure 2 ;

[0022] Figure 4 is a structural schematic diagram of the outer shell, the exhaust fan and the reinforcing assembly in the biological safety cabinet of the embodiment of the application

[0023] Figure 5 is a sectional view in B-B direction of Figure 2 ;

[0024] Figure 6 is an enlarged schematic diagram of P in Figure 5 .

[0025] In the drawings:

[0026] 110, inner housing; 111, working chamber;

[0027] 120, outer housing; 121, operation window; 122, air duct; 123, exhaust chamber; 124, supply chamber; 125, supply port; 126, first control valve; 127, pipe; 128, second control valve;

[0028] 210, first reinforcing assembly; 211, first reinforcing rib; 212, second reinforcing rib; 213, third reinforcing rib;

[0029] 220, second reinforcing assembly; 221, fourth reinforcing rib; 222, fifth reinforcing rib;

[0030] 310, exhaust fan; 320, exhaust filter; 330, exhaust pipe; 331, third control valve; 340, exhaust branch pipe; 341, fourth control valve;

[0031] 410, supply filter; 420, supply fan;

[0032] 500, outer exhaust fan. DETAILED DESCRIPTION

[0033] Firstly, those skilled in the art should understand that the embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments as needed in order to adapt to specific application occasions.

[0034] Secondly, it should be noted that in the description of the embodiments of the present application, the terms indicating the direction or position relationship of the terms "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0035] In addition, it should be noted that in the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0037] As described in the background, the strength of the surrounding plate of the biosafety cabinet in the related art is low, which leads to the deformation of the surrounding plate during the movement or transportation of the biosafety cabinet. The inventors have found that the reason for this problem is that no reinforcing member capable of improving the strength of the surrounding plate is arranged on the surrounding plate.

[0038] In view of the above technical problems, the embodiments of the present application provide a biosafety cabinet. The first reinforcing rib and the second reinforcing rib are arranged on the inner side of the rear end of the outer shell, and the first reinforcing rib and the second reinforcing rib are both arranged obliquely relative to the vertical direction, so as to guide the air flowing upwards along the inner side of the rear end of the outer shell towards the fan, thereby making the reinforcing assembly not only strengthen the structural strength of the outer shell, so that the outer shell is not prone to deformation during the movement or transportation of the biosafety cabinet, but also guide the airflow in the air duct towards the fan, so that the air flow rate of the biosafety cabinet is improved, thereby improving the air purification efficiency of the biosafety cabinet.

[0039] The principles and characteristics of the embodiments of the present application will be described below in combination with the drawings. The examples are only used to explain the embodiments of the present application, and are not used to limit the scope of the embodiments of the present application.

[0040] Reference Figures 1-3 The biosafety cabinet provided by the embodiments of the present application includes a cabinet body, an exhaust fan 310, and an exhaust filter 320. The cabinet body includes an inner shell 110 and an outer shell 120. The outer shell 120 is arranged on the outer side of the inner shell 110. The inner shell 110 has a working chamber 111. The bottom of the working chamber 111 has a workbench. The workbench is used to place experimental samples. The front end of the outer shell 120 is provided with an operation window 121. The operation window 121 is in communication with the working chamber 111. The top end of the inner shell 110 and the outer shell 120 form a purification chamber. The side of the inner shell 110 away from the operation window 121 and the outer shell 120 form an air duct 122. The bottom end of the air duct 122 is in communication with the working chamber 111. The top end of the air duct 122 is in communication with the purification chamber. That is, the working chamber 111 and the purification chamber are in communication through the air duct 122.

[0041] The outer shell 120 is provided with an exhaust port, the exhaust fan 310 and the exhaust filter 320 are arranged in the purification chamber, the exhaust filter 320 is opposite to the exhaust port, and the exhaust fan 310 is arranged on the side of the exhaust filter 320 away from the exhaust port.

[0042] When the exhaust fan 310 works, the contaminated air in the working chamber 111 that contacts the test sample flows upward to the purification chamber through the air duct 122, is filtered by the exhaust filter 320, and is discharged out of the cabinet through the exhaust port to protect the environment.

[0043] The inner side of the rear end of the outer shell 120 is provided with a reinforcing assembly, and the reinforcing assembly includes a first reinforcing assembly 210, which is described with reference to Figure 4 The first reinforcing assembly 210 includes a first reinforcing rib 211 and a second reinforcing rib 212, and the first reinforcing rib 211 and the second reinforcing rib 212 are both arranged to be inclined with respect to the vertical direction. The top ends of the first reinforcing rib 211 and the second reinforcing rib 212 are both located below the orthographic projection of the exhaust fan 310 on the rear end of the outer shell 120. The bottom ends of the first reinforcing rib 211 and the second reinforcing rib 212 are mutually opposite and extend downwardly and obliquely.

[0044] On the one hand, the first reinforcing rib 211 and the second reinforcing rib 212 can strengthen the structural strength of the outer shell 120, so that the outer shell 120 is not easy to deform during the movement or transportation of the biosafety cabinet.

[0045] On the other hand, the distance between the first reinforcing rib 211 and the second reinforcing rib 212 along the length direction of the outer shell 120 gradually decreases from bottom to top. When the exhaust fan 310 works, the contaminated air at the bottom end of the air duct 122 flows upward. The first reinforcing rib 211 and the second reinforcing rib 212 can guide the contaminated air flowing along the surfaces thereof toward the exhaust fan 310, so that the air flow rate in the air duct 122 is improved, thereby improving the air purification efficiency of the biosafety cabinet.

[0046] The biosafety cabinet of the embodiment comprises a cabinet body and a fan, the cabinet body comprises an inner shell 110 and an outer shell 120, the inner shell 110 has a working chamber 111 therein, the front end of the outer shell 120 is provided with an operation window 121, the operation window 121 communicates with the working chamber 111; a purification chamber is formed between the top end of the inner shell 110 and the outer shell 120, the fan is arranged in the purification chamber, a duct 122 is formed between the side of the inner shell 110 away from the operation window 121 and the outer shell 120, the bottom end of the duct 122 communicates with the working chamber 111, and the top end of the duct 122 communicates with the purification chamber; a reinforcing assembly is arranged on the inner side of the rear end of the outer shell 120, the reinforcing assembly comprises a first reinforcing assembly 210, the first reinforcing assembly 210 comprises a first reinforcing rib 211 and a second reinforcing rib 212, the first reinforcing rib 211 and the second reinforcing rib 212 are both arranged obliquely relative to the vertical direction, the top end of the first reinforcing rib 211 and the top end of the second reinforcing rib 212 are both located below the orthographic projection of the fan on the rear end of the outer shell 120, and the bottom end of the first reinforcing rib 211 and the bottom end of the second reinforcing rib 212 extend downward and away from each other. Through the above arrangement, the first reinforcing rib 211 and the second reinforcing rib 212 are both arranged obliquely relative to the vertical direction to guide the air flowing upward along the inner side of the rear end of the outer shell 120 towards the fan, so that the reinforcing assembly can not only strengthen the structural strength of the outer shell 120, but also make the outer shell 120 less likely to be deformed during the movement or transportation of the biosafety cabinet; the first reinforcing rib 211 and the second reinforcing rib 212 can also guide the airflow in the duct 122 towards the fan, so that the air flow rate of the biosafety cabinet is improved, thereby improving the air purification efficiency of the biosafety cabinet.

[0047] With reference to Figure 5 and Figure 6 , the cross section of the above-mentioned first reinforcing rib 211 and second reinforcing rib 212 can both be triangular, in the case that the width of the first reinforcing rib 211 or the second reinforcing rib 212 along the length direction of the outer shell 120 and the width of the first reinforcing rib 211 or the second reinforcing rib 212 along the width direction of the outer shell 120 are both constant, the first reinforcing rib 211 or the second reinforcing rib 212 with a triangular cross section has a reinforcing effect on the rear end of the outer shell 120 similar to that of the first reinforcing rib 211 or the second reinforcing rib 212 with a rectangular cross section, but the cross-sectional area of the first reinforcing rib 211 or the second reinforcing rib 212 with a triangular cross section is smaller than that of the first reinforcing rib 211 or the second reinforcing rib 212 with a rectangular cross section, so the resistance of the first reinforcing rib 211 or the second reinforcing rib 212 with a triangular cross section to the air in the duct 122 is smaller than that of the first reinforcing rib 211 or the second reinforcing rib 212 with a rectangular cross section, thereby making the flow rate of the contaminated air in the duct 122 higher, and improving the air purification efficiency of the biosafety cabinet.

[0048] Further, the first reinforcing assembly 210 can further include a third reinforcing rib 213 extending in the vertical direction, the third reinforcing rib 213 being disposed between the first reinforcing rib 211 and the second reinforcing rib 212, and the third reinforcing rib 213 can further improve the structural strength of the outer cabinet 120.

[0049] The axis of the first reinforcing rib 211 and the axis of the second reinforcing rib 212 can be symmetrical about the axis of the third reinforcing rib 213, so that the structural strength of the outer cabinet 120 on both sides of the third reinforcing rib 213 is equivalent, and the structural stability of the outer cabinet 120 is higher.

[0050] Reference Figure 4 In some embodiments, the exhaust fan 310 can be multiple, and the multiple exhaust fans 310 are arranged at intervals along the length direction of the cabinet body; the first reinforcing assembly 210 can also be multiple, and each first reinforcing assembly 210 corresponds to one exhaust fan 310, that is, each exhaust fan 310 corresponds to one first reinforcing assembly 210 on the outer cabinet 120, and each first reinforcing assembly 210 guides the contaminated air in the air duct 122 towards the corresponding exhaust fan 310, so as to further improve the structural strength of the outer cabinet 120 and the air circulation rate in the air duct 122.

[0051] Continue to refer to Figure 4 And Figure 5 Further, the reinforcing assembly can further include a second reinforcing assembly 220 extending in the vertical direction, the second reinforcing assembly 220 being disposed between two adjacent first reinforcing assemblies 210.

[0052] The second reinforcing assembly 220 can include a fourth reinforcing rib 221 and a fifth reinforcing rib 222, both of which extend in the vertical direction, and the cross sections of the fourth reinforcing rib 221 and the fifth reinforcing rib 222 are both triangular.

[0053] The fourth reinforcing rib 221 and the fifth reinforcing rib 222 can be supported between two adjacent first reinforcing assemblies 210, so as to further improve the structural strength of the outer cabinet 120.

[0054] The cross sections of the fourth and fifth reinforcing ribs 221 and 222 are triangular, which has similar functional effects to the triangular cross sections of the first and second reinforcing ribs 211 and 212. When the widths of the fourth and fifth reinforcing ribs 221 and 222 along the length direction of the outer shell 120 and along the width direction of the outer shell 120 are constant, the reinforcing effects of the triangular cross sections of the fourth and fifth reinforcing ribs 221 and 222 on the rear end of the outer shell 120 are similar to those of the rectangular cross sections of the fourth and fifth reinforcing ribs 221 and 222. However, the cross-sectional areas of the triangular cross sections of the fourth and fifth reinforcing ribs 221 and 222 are smaller than those of the rectangular cross sections of the fourth and fifth reinforcing ribs 221 and 222. Therefore, the triangular cross sections of the fourth and fifth reinforcing ribs 221 and 222 have smaller resistance to the air in the air duct 122 than the rectangular cross sections of the fourth and fifth reinforcing ribs 221 and 222, so that the flow rate of the contaminated air in the air duct 122 is higher, and the air purification efficiency of the biological safety cabinet is improved.

[0055] With reference to the foregoing Figures 1-3 In some embodiments, the biological safety cabinet can further include a supply air filter 410, a supply air fan 420, and an exhaust pipe 330. The purification chamber can include an exhaust air chamber 123 and a supply air chamber 124 which are separated from each other. The exhaust air chamber 123 is arranged close to the air duct 122. The outer shell 120 can further be provided with a supply air outlet 125 which communicates with the supply air chamber 124. The supply air outlet 125 is provided with a first control valve 126. The supply air filter 410 and the supply air fan 420 are arranged in the supply air chamber 124. The supply air chamber 124 communicates with the working chamber 111. The top of the inner shell 110 can be provided with an air outlet. The supply air filter 410 is arranged close to the air outlet. The supply air fan 420 is arranged on the side of the supply air filter 410 which is away from the air outlet.

[0056] The exhaust air chamber 123 and the supply air chamber 124 communicate through a pipe 127. The pipe 127 is provided with a second control valve 128.

[0057] The exhaust pipe 330 is arranged outside the cabinet. One end of the exhaust pipe 330 communicates with the exhaust air outlet. The other end of the exhaust pipe 330 is configured to communicate with the outdoor environment. The exhaust pipe 330 is provided with a third control valve 331.

[0058] When the first control valve 126 is closed, the second control valve 128 is opened, and the third control valve 331 is opened, the biological safety cabinet is equivalent to a level II A2 biological safety cabinet. After the contaminated air is filtered by the level II A2 biological safety cabinet, part of the filtered air is returned to the workbench, and the other part of the filtered air is discharged outside the cabinet. Since part of the filtered air is recycled, the level II A2 biological safety cabinet is more energy-saving and environmentally friendly.

[0059] In this embodiment, when the first control valve 126 is closed, the second control valve 128 is opened, the third control valve 331 is opened, and the supply air fan 420 and the exhaust air fan 310 are both running, the contaminated air that has contacted the test sample enters the exhaust chamber 123 through the air duct 122. Part of the contaminated air enters the supply air chamber 124 through the duct 127 under the action of the supply air fan 420, is filtered by the supply air filter 410, and is returned to the working chamber 111 from the air outlet. The other part of the contaminated air flows to the exhaust air filter 320 under the action of the exhaust air fan 310, is filtered by the exhaust air filter 320, and is discharged through the exhaust duct 330.

[0060] When the first control valve 126 is opened, the second control valve 128 is closed, and the third control valve 331 is opened, the biosafety cabinet is equivalent to a type II B2 biosafety cabinet. After the contaminated air is filtered by the type II B2 biosafety cabinet, it is all discharged to the outdoor environment. The type II B2 biosafety cabinet can be used for microbial experiments with volatile toxic chemicals and radioactive nuclides as auxiliary agents.

[0061] In this embodiment, when the first control valve 126 is opened, the second control valve 128 is closed, and the third control valve 331 is opened, the clean air in the indoor environment enters the supply air chamber 124 through the supply air inlet 125 under the action of the supply air fan 420, flows to the working chamber 111 after being filtered by the supply air filter 410, becomes contaminated air after contacting the test sample on the workbench, flows to the exhaust chamber 123 through the air duct 122 under the action of the exhaust air filter 320, and is discharged to the outdoor environment through the exhaust duct 330 after being filtered by the exhaust air filter 320.

[0062] The biosafety cabinet in this embodiment can be switched between a type II A2 biosafety cabinet and a type II B2 biosafety cabinet by adjusting the states (opened or closed) of the first control valve 126, the second control valve 128, and the third control valve 331. Users can reasonably switch the biosafety cabinet to a type II A2 biosafety cabinet or a type II B2 biosafety cabinet according to the characteristics of the samples to be processed, so that the biosafety cabinet is more efficient, safe, and energy-saving when in use.

[0063] From the perspectives of energy saving and environmental protection, as a user, when performing microbial experiments with volatile toxic chemicals and radioactive nuclides as auxiliary agents, a type II B2 biosafety cabinet is selected. When performing conventional experiments, there is no need to use a type II B2 biosafety cabinet. A type II A2 biosafety cabinet can meet the requirements. Using a type II B2 biosafety cabinet is a waste of energy consumption.

[0064] Continuing to refer to Figure 1 and Figure 2Further, the exhaust pipe 330 can be connected with an exhaust branch pipe 340, which is located between the exhaust port and the third control valve 331, and the end of the exhaust branch pipe 340 is configured to communicate with the indoor environment outside the cabinet, and the fourth control valve 341 is arranged on the exhaust branch pipe 340, and the end of the exhaust pipe 330 is configured to communicate with the outdoor environment.

[0065] When the first control valve 126 is closed, the second control valve 128 is opened, the third control valve 331 is closed, and the fourth control valve 341 is opened, the biosafety cabinet corresponds to a level II A2 biosafety cabinet. The contaminated air contacting the test sample enters the exhaust chamber 123 through the air duct 122. Part of the contaminated air enters the air supply chamber 124 through the pipeline 127 under the action of the air supply fan 420, is filtered by the air supply filter 410, and then returns to the working chamber 111 from the air outlet. The other part of the contaminated air flows to the exhaust filter 320 under the action of the exhaust fan 310, is filtered by the exhaust filter 320, and then is discharged to the indoor environment outside the cabinet through the exhaust branch pipe 340.

[0066] When the first control valve 126 is opened, the second control valve 128 is closed, the third control valve 331 is opened, and the fourth control valve 341 is closed, the biosafety cabinet corresponds to a level II B2 biosafety cabinet. The clean air in the indoor environment enters the air supply chamber 124 through the air supply port 125 under the action of the air supply fan 420, flows to the working chamber 111 after being filtered by the air supply filter 410, becomes contaminated air after contacting the test sample on the workbench, flows to the exhaust chamber 123 through the air duct 122 under the action of the exhaust filter 320, is filtered by the exhaust filter 320, and then is discharged to the outdoor environment through the exhaust pipe 330.

[0067] Further, the biosafety cabinet can further include an external exhaust fan 500, which is arranged at the end of the exhaust pipe 330. Since the end of the exhaust pipe 330 extends to the outdoor environment, the length of the exhaust pipe 330 is relatively long. The external exhaust fan 500 is arranged at the end of the exhaust pipe 330 to accelerate the exhaust rate of the air in the exhaust pipe 330.

[0068] When the first control valve 126 is closed, the second control valve 128 is opened, the third control valve 331 is closed, and the fourth control valve 341 is opened, the air supply fan 420 is running, the exhaust fan 310 is running, and the external exhaust fan 500 is closed, the biosafety cabinet corresponds to a level II A2 biosafety cabinet.

[0069] When the first control valve 126 is opened, the second control valve 128 is closed, the third control valve 331 is opened, and the fourth control valve 341 is closed, the air supply fan 420, the exhaust fan 310, and the external exhaust fan 500 are all running, the biosafety cabinet corresponds to a level II B2 biosafety cabinet.

[0070] The air supply port 125 and the air exhaust port can be arranged on the top of the outer shell 120, and the air exhaust pipe 330 is connected to the air exhaust port. The air exhaust pipe 330 is connected to the top of the outer shell 120, so that the biological safety cabinet is easier to install.

[0071] In summary, the biological safety cabinet of the embodiments of the present application comprises a cabinet body and a fan. The cabinet body comprises an inner shell 110 and an outer shell 120. The inner shell 110 has a working chamber 111 therein. The front end of the outer shell 120 is provided with an operation window 121. The operation window 121 is in communication with the working chamber 111. A purification chamber is formed between the top end of the inner shell 110 and the outer shell 120. The fan is arranged in the purification chamber. A duct 122 is formed between the side of the inner shell 110 away from the operation window 121 and the outer shell 120. The bottom end of the duct 122 is in communication with the working chamber 111, and the top end of the duct 122 is in communication with the purification chamber. The inner side of the rear end of the outer shell 120 is provided with a reinforcing assembly. The reinforcing assembly comprises a first reinforcing assembly 210. The first reinforcing assembly 210 comprises a first reinforcing rib 211 and a second reinforcing rib 212. The first reinforcing rib 211 and the second reinforcing rib 212 are both arranged obliquely relative to the vertical direction. The top ends of the first reinforcing rib 211 and the second reinforcing rib 212 are both located below the orthographic projection of the fan on the rear end of the outer shell 120. The bottom ends of the first reinforcing rib 211 and the second reinforcing rib 212 are mutually away and extend downwardly and obliquely. Through the above arrangement, the first reinforcing rib 211 and the second reinforcing rib 212 are both arranged obliquely relative to the vertical direction to guide the air flowing upward along the inner side of the rear end of the outer shell 120 toward the fan. Thus, the reinforcing assembly can not only strengthen the structural strength of the outer shell 120, so that the outer shell 120 is not easy to deform during the moving or transporting of the biological safety cabinet, but also guide the airflow in the duct 122 toward the fan, so that the air flow rate of the biological safety cabinet is improved, thereby improving the air purification efficiency of the biological safety cabinet.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A biosafety cabinet, characterized in that, The device includes a cabinet and a fan. The cabinet includes an inner shell and an outer shell fitted over the inner shell. The inner shell has a working chamber. The front end of the outer shell has an operation window that communicates with the working chamber. A purification chamber is formed between the top of the inner shell and the outer shell. The fan is disposed in the purification chamber. An air duct is formed between the side of the inner shell away from the operation window and the outer shell. The bottom end of the air duct communicates with the working chamber, and the top end of the air duct communicates with the purification chamber. A reinforcing component is provided on the inner rear end of the outer casing. The reinforcing component includes a first reinforcing component, which includes a first reinforcing rib and a second reinforcing rib. Both the first and second reinforcing ribs are inclined relative to the vertical direction. The top ends of the first and second reinforcing ribs are located below the projection of the fan on the outer casing. The bottom ends of the first and second reinforcing ribs are opposite to each other and extend downward at an incline. The cross-sections of both the first reinforcing rib and the second reinforcing rib are triangular; The first reinforcing component further includes a third reinforcing rib, which extends in a vertical direction and is disposed between the first reinforcing rib and the second reinforcing rib; There are multiple fans, and the multiple fans are spaced apart along the length of the cabinet. There are multiple first reinforcing components, and each first reinforcing component corresponds to one of the wind turbines; The reinforcing component further includes a second reinforcing component that extends vertically and is disposed between two adjacent first reinforcing components.

2. The biosafety cabinet according to claim 1, characterized in that, The second reinforcing component includes a fourth reinforcing rib and a fifth reinforcing rib, both of which extend vertically and have triangular cross-sections.

3. The biosafety cabinet according to any one of claims 1 or 2, characterized in that, The fan is an exhaust fan, and the inlet of the exhaust fan faces the inner rear end of the outer casing; The biosafety cabinet also includes an air supply filter, an air supply fan, an exhaust filter, and an exhaust duct. The purification chamber includes a separate exhaust chamber and an air supply chamber. The exhaust chamber is located near the air duct. The outer shell is provided with an air supply outlet and an exhaust outlet. The air supply outlet communicates with the air supply chamber. A first control valve is provided at the air supply outlet. The air supply filter and the air supply fan are both located in the air supply chamber. The air supply chamber communicates with the working chamber. The exhaust vent is connected to the exhaust chamber, and the exhaust filter and the exhaust fan are both located in the exhaust chamber; The exhaust chamber and the supply chamber are connected by a pipe, and a second control valve is installed on the pipe. The exhaust pipe is located outside the cabinet and is connected to the exhaust port. A third control valve is installed on the exhaust pipe.

4. The biosafety cabinet according to claim 3, characterized in that, The exhaust duct is also connected to an exhaust branch duct, which is located between the exhaust outlet and the third control valve. The end of the exhaust branch duct is configured to communicate with the indoor environment outside the cabinet. A fourth control valve is installed on the exhaust branch duct, and the end of the exhaust duct is configured to communicate with the outdoor environment.

5. The biosafety cabinet according to claim 4, characterized in that, The biosafety cabinet also includes an exhaust fan, which is located at the end of the exhaust duct.

6. The biosafety cabinet according to claim 3, characterized in that, Both the air supply port and the air exhaust port are located on the top of the outer casing.

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