Biological safety cabinet

Abstract

The application provides a biological safety cabinet, which comprises a cabinet body, a fan assembly and a filter assembly. The cabinet body has a working cavity and an air flow circulation cavity. A partition member is arranged in the cabinet body and is inclined relative to the bottom wall of the cabinet body, so as to divide the air flow circulation cavity into a first circulation cavity and a second circulation cavity. The fan assembly comprises a first fan unit and a second fan unit. The cabinet body is provided with an air outlet and an air inlet. The first fan unit is configured to drive the circulation of the gas in the air flow circulation cavity. The second fan unit is configured to provide a negative pressure for the working cavity. The first fan unit comprises a first bellows. The filter assembly comprises a first filter member. The side wall of the first bellows towards the partition member has an extension direction consistent with the inclination direction of the partition member. The first bellows is rotationally connected with the partition member, so as to mount the first filter member between the air outlet and the first bellows. The biological safety cabinet has different levels of biological safety protection and is convenient to assemble.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of filter exhaust equipment, and particularly relates to a biological safety cabinet. BACKGROUND

[0002] At present, biological safety cabinets are widely used in medical health, disease prevention and control, food hygiene, biological pharmaceuticals, environmental monitoring and various biological laboratories, and the biological safety cabinet is a box-shaped air purification negative pressure safety device capable of preventing some biological particles containing dangerous or unknown biological particles from being dispersed in the form of aerosol during experimental operation and processing.

[0003] Biological safety cabinets can be divided into three categories of first, second and third levels to meet different biological research and protection requirements. The commonly used second biological safety cabinet is mainly of the second A2 type and the second B2 type. When performing microbial experiments with volatile toxic chemicals and radioactive nuclides as auxiliary agents, the B2 type biological safety cabinet should be selected. When performing conventional experiments, the A2 type biological safety cabinet can meet the requirements. Users can select the A2 type biological safety cabinet or the B2 type biological safety cabinet according to the characteristics of the experimental samples to be processed.

[0004] However, equipping multiple biological safety cabinets of different types at the same time will increase the user's use cost. SUMMARY

[0005] In order to solve the above problems in the prior art, the present application provides a biological safety cabinet which simultaneously has multiple different levels of biological safety protection levels to reduce the user's use cost and facilitate assembly.

[0006] The present application provides a biological safety cabinet, which comprises a cabinet body, a fan assembly and a filter assembly. The cabinet body has a working cavity and an air flow circulation cavity which are in communication with each other. The air flow circulation cavity is in communication with the outside of the cabinet body. A partition member is arranged in the cabinet body and is inclined relative to the bottom wall of the cabinet body, so as to divide the air flow circulation cavity into a first circulation cavity and a second circulation cavity.

[0007] The fan assembly comprises a first fan unit arranged in the first circulation cavity and a second fan unit arranged in the second circulation cavity. The cabinet body is provided with an exhaust port in communication with the first circulation cavity and the outside of the cabinet body, and an air inlet in communication with the second circulation cavity and the outside of the cabinet body. The first fan unit is configured to drive the circulation of gas in the air flow circulation cavity, and the second fan unit is configured to provide negative pressure for the working cavity.

[0008] The first fan unit comprises a first air bellow, and the filter assembly comprises a first filter member. The side wall of the first air bellow facing the partition member is consistent with the inclination direction of the partition member, and the first air bellow is rotationally connected with the partition member, so as to mount the first filter member between the exhaust port and the first air bellow.

[0009] In a possible implementation, the biosafety cabinet has the first circulating cavity located at the side of the working cavity, and the second circulating cavity located above the working cavity, and the exhaust port is arranged above the first circulating cavity.

[0010] In a possible implementation, the biosafety cabinet has the first air bellow having a first side wall and a second side wall connected to each other on the side of the partition, the first side wall being arranged vertically relative to the bottom wall of the cabinet body, and the second side wall being arranged obliquely relative to the bottom wall of the cabinet body.

[0011] In a possible implementation, the biosafety cabinet further comprises a first fan, the first air bellow has a third side wall connected to the end of the first side wall in the extending direction, the first fan is communicated with the third side wall, and the first fan is arranged on the side of the third side wall away from the partition.

[0012] In a possible implementation, the biosafety cabinet has the partition comprising a first partition plate and a second partition plate, the first partition plate being arranged vertically relative to the bottom wall of the cabinet body and connected to the top wall of the cabinet body, and the second partition plate having a first side edge and a second side edge opposite to each other, the first side edge being connected to the first partition plate and inclined towards the second side edge.

[0013] In a possible implementation, the biosafety cabinet has the first air bellow further comprising a first connecting portion and a second connecting portion, the first connecting portion being rotatably connected to the first partition plate, and the second connecting portion being detachably connected to the cabinet body.

[0014] In a possible implementation, the biosafety cabinet has the partition further comprising a third partition plate connected between the second side edge and the outer wall of the working cavity.

[0015] In a possible implementation, the biosafety cabinet has the second fan unit comprising a second air bellow and a second fan, the second air bellow being arranged above the working cavity, and the second fan being arranged in the second air bellow on the side away from the working cavity.

[0016] In a possible implementation, the biosafety cabinet further comprises a second filter element, the top of the working cavity has a make-up air port, and the second filter element is arranged between the second fan and the make-up air port.

[0017] In a possible implementation, the biosafety cabinet has the second air bellow rotatably connected to the third partition plate on the side close to the partition, and detachably connected to the cabinet body on the side away from the partition.

[0018] The biosafety cabinet provided by the present application comprises a cabinet body, a fan assembly and a filter assembly, the cabinet body comprises a working cavity, an airflow circulation cavity, an air inlet and an air outlet, the airflow circulation cavity comprises a first circulation cavity and a second circulation cavity, the fan assembly comprises a first air bellow, and the filter assembly comprises a first filter piece. The working cavity is arranged to provide an experimental operation space, the air inlet is arranged to supply air to the working cavity, the air outlet is arranged to discharge air from the working cavity, the partition piece is arranged to divide the airflow circulation cavity into the first circulation cavity and the second circulation cavity, so as to form different airflow modes together with the air inlet and the air outlet, and the biosafety cabinet forms biosafety protection modes of different levels. The first fan unit and the second fan unit are arranged to drive the circulation of air in the cabinet body, the first fan unit is arranged with the first air bellow to form a negative pressure area, so as to drive the air in the first circulation cavity to pass through the first air bellow and the air outlet and be discharged after being filtered by the first filter piece, the partition piece is arranged to be inclined, so as to reasonably arrange the installation space of the airflow circulation cavity, the first air bellow is arranged to be inclined towards the side wall of the partition piece, so as to prevent the first air bellow from interfering with the partition piece when the first air bellow rotates towards the partition piece, and the first air bellow and the air outlet form a larger installation space, so as to facilitate the installation of the first filter piece between the first air bellow and the air outlet. Therefore, the biosafety cabinet provided by the present application has at least two different levels of biosafety protection, and is convenient to assemble. BRIEF DESCRIPTION OF DRAWINGS

[0019] The specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] The accompanying drawings are:

[0021] Figure 1 is a structural schematic view of the biosafety cabinet provided by the present application;

[0022] Figure 2 is a front view of Figure 1 ;

[0023] Figure 3 is an A-A cross-sectional view of Figure 2 ;

[0024] Figure 4 is an enlarged view of B in Figure 3 ;

[0025] Figure 5 is a structural schematic view of the first fan unit in the biosafety cabinet provided by the present application;

[0026] Figure 6 is a structural schematic view of the first air bellow in Figure 5 ;

[0027] Figure 7is a structure schematic view of a partition member in a biological safety cabinet provided by an embodiment of the present application;

[0028] Figure 8 is a structure schematic view of a first filtering member in a biological safety cabinet provided by an embodiment of the present application;

[0029] Figure 9 is Figure 2 a C-C cross-sectional view.

[0030] Reference signs:

[0031] 100 - cabinet body; 110 - working cavity; 120 - air flow circulation cavity; 121 - first circulation cavity; 122 - second circulation cavity; 130 - partition member; 131 - first partition plate; 132 - second partition plate; 1321 - first side edge; 1322 - second side edge; 133 - third partition plate; 140 - air outlet; 150 - air inlet;

[0032] 200 - fan assembly; 210 - first fan unit; 211 - first air bellow; 2111 - first side wall; 2112 - second side wall; 2113 - third side wall; 2114 - first connecting part; 2115 - second connecting part; 212 - first fan; 220 - second fan unit; 221 - second air bellow; 222 - second fan; 230 - third fan unit;

[0033] 300 - filtering assembly; 310 - first filtering member; 320 - second filtering member; 330 - third filtering member;

[0034] 400 - valve assembly; 410 - first valve; 420 - second valve; 430 - third valve; 440 - fourth valve;

[0035] 500 - air outlet pipe. DETAILED DESCRIPTION

[0036] Firstly, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed in order to adapt to specific application occasions.

[0037] Secondly, it should be noted that in the description of the present application, the terms indicating the direction or position relationship of "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 present application.

[0038] In addition, it should be noted that in the description 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 present application can be understood according to the specific circumstances.

[0039] The commonly used secondary biological safety cabinet at present is mainly secondary A2 type and secondary B2 type. For the airflow contacting the experimental sample, the A2 type biological safety cabinet is recycled, and the B2 type biological safety cabinet is directly discharged. When performing microbial experiments with volatile toxic chemicals and radioactive nuclides as auxiliary agents, the B2 type biological safety cabinet should be selected, and when performing conventional experiments, the A2 type biological safety cabinet can meet the requirements. Users can select to use the A2 type biological safety cabinet or the B2 type biological safety cabinet according to the characteristics of the experimental sample to be treated.

[0040] However, equipping multiple biological safety cabinets of different types at the same time will increase the user's use cost. This is because biological safety cabinets of different safety protection levels have different air flow processing. For the airflow contacting the experimental sample, the A2 type biological safety cabinet is recycled, and the B2 type biological safety cabinet is directly discharged. Based on the airflow flow characteristics of the two, the B2 type safety cabinet can be used for microbial experiments with volatile toxic chemicals and radioactive nuclides as auxiliary agents. The A2 type biological safety cabinet can only be used to process non-toxic and non-radioactive experimental samples. The A2 type biological safety cabinet must be connected to a suitable exhaust hood when used for microbial experiments with trace volatile toxic chemicals and trace radioactive nuclides as auxiliary agents.

[0041] Although the B2 type biological safety cabinet can process samples that the A2 type biological safety cabinet cannot process, the exhaust volume of the B2 type biological safety cabinet is larger than that of the A2 type, so the power consumption of the B2 type biological safety cabinet is higher than that of the A2 type biological safety cabinet. In addition, due to the large exhaust volume of the B2 type biological safety cabinet, the working area needs to be supplemented with the same exhaust volume.

[0042] From the energy saving and environmental protection point of view, when the microbial experiment with volatile toxic chemicals and radionuclide as auxiliary agent needs to be selected B2 type biological safety cabinet, when the conventional experiment is carried out, it is not necessary to use B2 type biological safety cabinet, and A2 type biological safety cabinet can meet the requirements, and the energy consumption of B2 type biological safety cabinet is large, and the biological safety cabinet in the related art is set according to the biological safety protection level, that is, the biological safety cabinets with different biological safety protection levels exist independently and cannot be switched with each other, and if the user needs to process different experimental samples, the biological safety cabinets with different biological safety protection levels need to be configured, thereby increasing the use cost of the user.

[0043] Therefore, there is an urgent need for a biological safety cabinet with multiple different levels of biological safety protection levels, according to the airflow flow characteristics of different levels of biological safety protection levels, at least three different chambers need to be provided in the cabinet body for gas flow, that is, an experimental operation space needs to be provided for the user, and a circulating flow space for gas needs to be provided, the circulating flow space for gas needs to be divided into two parts, in order to divide the circulating flow space for gas into two parts, a partition needs to be provided in the cabinet body, but the existence of the partition will make the space in the biological safety cabinet become cramped, and it is not convenient to install other parts.

[0044] In view of the above problems, the embodiments of the present application provide a biological safety cabinet, which simultaneously has multiple different levels of biological safety protection levels, is more energy-saving and environmentally friendly, and the space in the biological safety cabinet is reasonably arranged and convenient to assemble.

[0045] The specific implementation of the biological safety cabinet provided by the embodiments of the present application will be described below with reference to the accompanying drawings.

[0046] Referring to Figures 1 to 8 The present application provides a biological safety cabinet, which comprises a cabinet body 100, a fan assembly 200 and a filter assembly 300, the cabinet body 100 has a working chamber 110 and an airflow circulation chamber 120 which are in communication with each other, the airflow circulation chamber 120 is in communication with the outside of the cabinet body 100, and the cabinet body 100 is provided with a partition member 130 which is inclined relative to the bottom wall of the cabinet body 100, so as to divide the airflow circulation chamber 120 into a first circulation chamber 121 and a second circulation chamber 122.

[0047] The fan assembly 200 comprises a first fan unit 210 arranged in the first circulation chamber 121 and a second fan unit 220 arranged in the second circulation chamber 122, the cabinet body 100 is provided with an exhaust port 140 which is in communication with the first circulation chamber 121 and the outside of the cabinet body 100, and an air inlet 150 which is in communication with the second circulation chamber 122 and the outside of the cabinet body 100, the first fan unit 210 is configured to drive the circulation flow of the gas in the airflow circulation chamber 120, and the second fan unit 220 is configured to provide negative pressure for the working chamber 110.

[0048] The first fan unit 210 comprises a first air bellow 211, and the filtering assembly 300 comprises a first filter 310. The first air bellow 211 is arranged in the same direction as the inclined direction of the side wall of the partition 130, and is rotatably connected to the partition 130, so as to install the first filter 310 between the air outlet 140 and the first air bellow 211.

[0049] In the embodiment, the cabinet 100 is a frame structure of a biological safety cabinet, and is used for installing the fan assembly 200, the filtering assembly 300 and the like. The fan assembly 200 is used for driving the circulation of the gas in the cabinet 100, so as to make the gas flow meet the corresponding biological safety protection level. For example, the fan assembly 200 can comprise a first fan unit 210 and a second fan unit 220. The first fan unit 210 is used for driving the circulation of the gas in the working cavity 110, and the second fan unit 220 is used for forming a negative pressure area in the working cavity 110, so as to protect the user and the experimental sample. The first fan unit 210 can comprise a first air bellow 211. The inner wall of the first air bellow 211 is used for forming an air duct, so as to drive the gas in the first circulation cavity 121 to be discharged through the first air bellow 211 and the air outlet 140.

[0050] It can be understood that the fan assembly 200 can be set according to the power and the air exhaust capacity and the like according to the safety protection level requirement. For example, the biological safety cabinet in the A1 mode and the biological safety cabinet in the A2 mode require that 70% of the gas is circulated after being filtered, and 30% of the gas is discharged out of the cabinet 100 after being filtered. The biological safety cabinet in the B2 mode requires that all the gas is discharged out of the cabinet 100 after being filtered, and there is no gas circulation in the cabinet 100. The biological safety cabinet in the A1 mode and the biological safety cabinet in the A2 mode require that the power of the fan assembly 200 is small, and the biological safety cabinet in the B2 mode requires that the power of the fan assembly 200 is large.

[0051] The filtering assembly 300 is used for filtering and purifying the gas flowing into the cabinet 100, and filtering and purifying the gas flowing out of the cabinet 100. For example, the filtering assembly 300 can comprise a first filter 310. The first filter 310 is installed between the first fan unit 210 and the air outlet 140, and is used for filtering and purifying the gas discharged through the air outlet 140, so as to avoid the pollution of the environment.

[0052] The cabinet 100 is provided with a working cavity 110 and an air circulation cavity 120. The side wall or top wall of the cabinet 100 is provided with an air inlet 150 and an air outlet 140. The working cavity 110 is used to provide a working space for a user to operate an experimental sample, so as to avoid contamination of the experimental sample and pollution of the environment by the experimental sample. The air circulation cavity 120 is used to provide a space for circulating flow of gas, and supplies gas to the working cavity 110 through the air inlet 150, and discharges air from the working cavity 110 through the air outlet 140, so as to form different air flow modes according to different biological safety protection levels. The cabinet 100 is provided with a partition 130, so as to divide the air circulation cavity 120 into a first circulation cavity 121 and a second circulation cavity 122, so that the biological safety cabinet has an air circulation space arranged according to different biological safety protection levels.

[0053] Thus, when the user needs to operate a microbial experiment with volatile toxic chemicals and radionuclides as auxiliary agents, the biological safety cabinet can be switched to the B2 mode, that is, the gas in the working cavity 110 flows through the first circulation cavity 121 and the air outlet 140, and is discharged to the outdoor after being filtered by the first filter 310. At the same time, the air in the room is filtered and purified by the filter assembly 300, and then flows to the working cavity 110 through the air supplement port and the second circulation cavity 122. In this way, the gas in the working cavity 110 can be completely discharged to the outdoor, and the working cavity 110 is supplemented with air of the same air discharge amount.

[0054] When the user needs to operate a common non-toxic and non-volatile microbial experiment, or a microbial experiment with trace volatile toxic chemicals and trace radionuclides as auxiliary agents, the biological safety cabinet can be switched to the A2 mode or the A1 mode. Part of the gas in the working cavity 110 flows through the first circulation cavity 121 and the air outlet 140, and is discharged to the indoor or outdoor after being filtered and purified by the first filter 310. Another part of the gas in the working cavity 110 flows through the first circulation cavity 121 and the second circulation cavity 122, and is returned to the working cavity 110 after being filtered and purified by the filter assembly 300. In this way, part of the gas in the working cavity 110 can be discharged out of the cabinet 100, and the other part of the gas can be recycled.

[0055] In order to reasonably arrange the internal space of the air flow circulating cavity 120, facilitate the installation of other components, such as the second fan unit 220, the partition piece 130 is arranged to be inclined relative to the bottom wall of the cabinet 100. In assembly, the first air bellow 211 is first rotatably connected to the partition piece 130, then the first filter piece 310 is installed between the first air bellow 211 and the air outlet 140, then the first air bellow 211 is rotated until the first air bellow 211 and the inner wall of the cabinet 100 are both in abutment with the first filter piece 310, and then the first air bellow 211 and the inner wall of the cabinet 100 are fixed, so as to fix the first filter piece 310 by the first air bellow 211 and the inner wall of the cabinet 100. The inclined direction of the partition piece 130 can be inclined from the southeast direction to the northwest direction, so that the second circulating cavity 122 forms an inverted funnel shape with a narrow upper part and a wide lower part. In this way, the side wall of the partition piece 130 facing the second circulating cavity 122 has a flow guiding and gathering effect on the gas.

[0056] Before the first filter piece 310 is installed, the first air bellow 211 needs to be rotated by an angle towards the partition piece 130 to leave installation space between the first air bellow 211 and the air outlet 140, thereby facilitating the placement of the first filter piece 310 between the first air bellow 211 and the air outlet 140. However, since the partition piece 130 is arranged to be inclined, the side wall of the first air bellow 211 facing the partition piece 130 is also arranged to be inclined relative to the bottom wall of the cabinet 100. When the first air bellow 211 is rotated, it is not easy to interfere with the partition piece 130. In this way, when the first air bellow 211 is rotated towards the partition piece 130, the angle of rotation can be larger, thereby forming more installation space for the installation of the first filter piece 310.

[0057] The biosafety cabinet of the embodiment of the present application comprises a cabinet body 100, a fan assembly 200 and a filtering assembly 300. The cabinet body 100 comprises a working cavity 110, an air flow circulation cavity 120, an air inlet 150 and an air outlet 140. The air flow circulation cavity 120 comprises a first circulation cavity 121 and a second circulation cavity 122. The fan assembly 200 comprises a first air bellow 211. The filtering assembly 300 comprises a first filtering member 310. The working cavity 110 is arranged to provide an experimental operation space. The air inlet 150 is arranged to supply air to the working cavity 110. The air outlet 140 is arranged to discharge air from the working cavity 110. The partition member 130 is arranged to divide the air flow circulation cavity 120 into the first circulation cavity 121 and the second circulation cavity 122, so as to form different air flow modes together with the air inlet 150 and the air outlet 140, thereby forming different levels of biosafety protection modes of the biosafety cabinet. The first fan unit 210 and the second fan unit 220 are arranged to drive the air circulation in the cabinet body 100. The first fan unit 210 is arranged to form a negative pressure area by the first air bellow 211, so as to drive the air in the first circulation cavity 121 to pass through the first air bellow 211 and the air outlet 140 and be discharged after being filtered by the first filtering member 310. The partition member 130 is arranged to be inclined, so as to reasonably arrange the installation space of the air flow circulation cavity 120. The first air bellow 211 is arranged to be inclined towards the side wall of the partition member 130, so as to prevent the first air bellow 211 from interfering with the partition member 130 when the first air bellow 211 rotates towards the partition member 130, thereby forming a larger installation space between the first air bellow 211 and the air outlet 140, and facilitating the installation of the first filtering member 310 between the first air bellow 211 and the air outlet 140. Thus, the biosafety cabinet of the embodiment of the present application has at least two different levels of biosafety protection, and is easy to assemble.

[0058] In a possible implementation, the first circulation cavity 121 is located at the side of the working cavity 110, the second circulation cavity 122 is located above the working cavity 110, and the air outlet 140 is arranged above the first circulation cavity 121.

[0059] In this way, the second fan unit 220 can form a vertical air flow in the working cavity 110, and further form a negative pressure in the working cavity 110, so as to prevent the indoor air from entering the working cavity 110 through the opening of the working cavity 110, and prevent the gas in the working cavity 110 from entering the indoor space through the opening of the working cavity 110. The gas in the working cavity 110 can be directly discharged through the air outlet 140 above the first circulation cavity 121 after being driven by the first fan unit 210, or after being divided, a part of the gas is discharged through the air outlet 140 above the first circulation cavity 121, and the other part of the gas flows through the second circulation cavity 122 back to the working cavity 110. In this way, the space in the cabinet 100 is arranged more reasonably, and the installation of the partition 130, the first air bellow 211 and the second fan unit 220 is facilitated.

[0060] Referring to Figure 4 With Figure 6 As shown in FIG. 1, in some embodiments, the first air bellow 211 has a first side wall 2111 and a second side wall 2112 connected to each other on the side facing the partition 130, the second side wall 2112 is connected to the bottom wall of the first air bellow 211, and the first side wall 2111 is vertically arranged relative to the bottom wall of the cabinet 100, and the second side wall 2112 is obliquely arranged relative to the bottom wall of the cabinet 100.

[0061] In this way, when the first air bellow 211 rotates towards the partition 130, the second side wall 2112 is less likely to interfere with the partition 130, so as to facilitate the installation of the first filter 310, and after the gas enters the first air bellow 211, the gas can flow along the second side wall 2112 and the first side wall 2111 to the air outlet 140, and the guiding effect of the air flow is good.

[0062] Referring to Figure 4 With Figure 5 As shown in FIG. 1, in some embodiments, the first fan unit 210 further comprises a first fan 212, the first air bellow 211 has a third side wall 2113 connected to the end of the first side wall 2111 in the extending direction, the first fan 212 is communicated with the third side wall 2113, and the first fan 212 is arranged on the side of the third side wall 2113 away from the partition 130.

[0063] The first fan 212 is used to drive the gas flow in the first circulation cavity 121 to the first air bellow 211, and then to be discharged through the first air bellow 211 and the air outlet 140. By arranging the first fan 212 on the third side wall 2113 away from the partition 130, the first fan 212 is arranged away from the partition 130, so that when the first filter 310 is installed, the first fan 212 with a large volume is not easy to interfere with the partition 130, and the arrangement shortens the negative pressure channel distance of the first air bellow 211, thereby increasing the negative pressure channel suction amount of the first fan unit 210, and improving the driving effect of the first fan unit 210.

[0064] The first fan 212 can be two in number, and the two first fans 212 are respectively connected to the third side wall 2113 at both ends of the extension direction of the first side wall 2111.

[0065] Referring to Figure 3 and Figure 7 As shown in the specific implementation, the partition 130 includes a first partition plate 131 and a second partition plate 132. The first partition plate 131 is arranged vertically relative to the bottom wall of the cabinet 100, and the first partition plate 131 is connected to the top wall of the cabinet 100. The second partition plate 132 has opposite first and second side edges 1321 and 1322. The first side edge 1321 is connected to the first partition plate 131, and the first side edge 1321 is inclined towards the second side edge 1322.

[0066] In this way, the second partition plate 132 of the partition 130 is arranged inclined relative to the bottom wall of the cabinet 100, so as to facilitate the installation of the second fan unit 220, and the connection of the partition 130 to the cabinet 100 through the first partition plate 131, thereby installing the partition 130 into the cabinet 100.

[0067] Referring to Figure 4 and Figure 5 As an optional embodiment, the first air bellow 211 further includes a first connecting portion 2114 and a second connecting portion 2115. The first connecting portion 2114 is rotatably connected to the first partition plate 131, and the second connecting portion 2115 is detachably connected to the cabinet 100.

[0068] Therefore, the first air bellow 211 can be rotatably connected to the first partition plate 131 through the first connecting portion 2114, so that the first air bellow 211 can be rotated towards the partition 130 to facilitate the installation of the first filter 310. After the first filter 310 is placed between the first air bellow 211 and the air outlet 140, the first air bellow 211 is rotated away from the partition 130 and connected to the cabinet 100 through the second connecting portion 2115, so that the first air bellow 211 and the first filter 310 are both assembled to the cabinet 100.

[0069] The second connecting part 2115 can be detachably connected with the cabinet body 100 through clamping or threaded connection, so as to replace the first filter 310 after long time use.

[0070] Referring to Figure 3 With Figure 7 As shown in a possible implementation, the partition member 130 further comprises a third partition plate 133 connected between the second side edge 1322 and the outer wall of the working cavity 110.

[0071] In this way, the partition member 130 can divide the air circulation cavity 120 into the first circulation cavity 121 and the second circulation cavity 122 whose on-off state is controllable.

[0072] Referring to Figure 9 As shown in a possible implementation, the second fan unit 220 comprises a second air bellow 221 and a second fan 222. The second air bellow 221 is arranged above the working cavity 110, and the second fan 222 is arranged in the second air bellow 221 and faces away from the working cavity 110.

[0073] In this way, when the second fan 222 works, a gas vortex can be formed in the second air bellow 221, and a negative pressure can be formed in the working cavity 110, thereby protecting the experimental sample in the working cavity 110.

[0074] Referring to Figure 9 As shown in a possible implementation, in order to further filter and purify the air entering the working cavity 110, the filter assembly 300 further comprises a second filter 320. The top of the working cavity 110 is provided with an air supplementing port, and the second filter 320 is arranged between the second fan 222 and the air supplementing port.

[0075] In this way, the external gas can enter the second circulation cavity 122 through the air inlet 150, and then enter the working cavity 110 after being filtered and purified by the second filter 320. Alternatively, the gas in the first circulation cavity 121 enters the second circulation cavity 122, and then reenters the working cavity 110 after being filtered and purified by the second filter 320, so that the gas entering the working cavity 110 is cleaner, thereby avoiding pollution of the experimental sample.

[0076] Referring to Figure 4 As shown, it should be noted that the filter assembly 300 can further comprise a third filter 330 arranged at the air inlet 150. The indoor air enters the second circulation cavity 122 after being filtered and purified by the third filter 330, and then enters the working cavity 110 after being filtered and purified by the second filter 320, so that the gas entering the working cavity 110 is cleaner, thereby preventing other substances in the air from polluting the experimental sample.

[0077] In order to facilitate installation of the second filter 320, the side of the second air bellow 221 close to the partition 130 is rotatably connected to the third partition 133, and the side of the second air bellow 221 away from the partition 130 is detachably connected to the cabinet 100.

[0078] In this way, during assembly, the side of the second air bellow 221 close to the partition 130 is rotatably connected to the third partition 133, and then the second air bellow 221 is rotated away from the working cavity 110, so that an installation space is formed between the second air bellow 221 and the air supplementing port, and the second filter 320 is assembled between the second air bellow 221 and the air supplementing port, and then the side of the second air bellow 221 away from the partition 130 is connected to the cabinet 100, so that the second filter 320 is fixed between the second air bellow 221 and the air supplementing port.

[0079] The second air bellow 221 is detachably connected to the cabinet 100 by means of clamping or threaded connection, so as to facilitate replacement of the second filter 320.

[0080] It can be understood that the biosafety cabinet provided by the embodiment of the present application can further include two sterilization assemblies, and the two sterilization assemblies are arranged at the air outlet 140 and the air supplementing port respectively, so that the gas discharged from the working cavity 110 and the gas entering the working cavity 110 are both sterilized, and the biosafety protection effect is better.

[0081] Referring to Figures 1 to 4 It should be noted that the biosafety cabinet provided by the embodiment of the present application can further include a valve assembly 400, and the valve assembly 400 can include a first valve 410, a second valve 420, a third valve 430 and a fourth valve 440. By controlling the opening and closing states of the valve assembly 400, the gas flow of the cabinet 100 is controlled, so that the biosafety cabinet forms different biosafety protection level modes.

[0082] In addition, the biosafety cabinet can further include an air exhaust pipe 500, and the air exhaust pipe 500 is connected to the air outlet 140 and the indoor environment and the air outlet 140 and the outdoor environment. The fan assembly 200 can further include a third fan unit 230, and the third fan unit 230 can include a third fan and a third air bellow. The third air bellow is arranged at the air exhaust end of the air exhaust pipe 500, and the third fan is arranged in the third air bellow and is used to drive the gas to be discharged to the outdoor environment through the air exhaust pipe 500.

[0083] When the user needs to operate a microbial experiment in which volatile toxic chemicals and radioactive nuclides are used as auxiliary agents, the first fan 212, the second fan 222 and the third fan can be started at the same time, the first valve 410, the third valve 430 and the fourth valve 440 are opened, and the second valve 420 is closed, so that the gas in the working cavity 110 is discharged to the outdoor environment, so as to avoid pollution of the indoor environment by the gas in the working cavity 110, and to protect the user.

[0084] When the user needs to operate the ordinary non-toxic and non-volatile microorganism experiment, the first fan 212 and the second fan 222 can be started at the same time, the third fan is closed, and the first valve 410 and the fourth valve 440 are closed, and the second valve 420 and the third valve 430 are opened. After the gas in the working cavity 110 flows to the first circulation cavity 121, part of the gas flows to the second circulation cavity 122 through the third valve 430, and then returns to the working cavity 110, and the other part of the gas enters the exhaust pipe 500 through the exhaust port 140 and is discharged to the indoor through the second valve 420.

[0085] When the user needs to carry out the microorganism experiment with trace volatile toxic chemicals and trace radionuclides as auxiliary agents, the first fan 212, the second fan 222 and the third fan can be started at the same time, the second valve 420 and the fourth valve 440 are closed, and the second valve 420 and the third valve 430 are opened. Part of the gas in the working cavity 110 is filtered and then returns to the working cavity 110, and the other part of the gas in the working cavity 110 is driven by the third fan and then discharged to the outdoor.

[0086] So far, the technical solutions of the present application have been described in combination with the specific embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A biological safety cabinet, characterized in that, The air conditioner comprises a cabinet, a fan assembly and a filter assembly, the cabinet has a working cavity and an air flow circulation cavity which are communicated with each other, the air flow circulation cavity is communicated with the outside of the cabinet, and a partition is arranged in the cabinet and is inclined to the bottom wall of the cabinet to divide the air flow circulation cavity into a first circulation cavity and a second circulation cavity; The fan assembly comprises a first fan unit arranged in the first circulation cavity and a second fan unit arranged in the second circulation cavity, the cabinet is provided with an air outlet which is communicated with the first circulation cavity and the outside of the cabinet, and an air inlet which is communicated with the second circulation cavity and the outside of the cabinet, the first fan unit is configured to drive the air flow circulation in the air flow circulation cavity, and the second fan unit is configured to provide negative pressure for the working cavity; The first fan unit comprises a first air bellow, the filter assembly comprises a first filter, the first air bellow has an extension direction which is consistent with the inclination direction of the side wall of the partition, and the first air bellow is rotationally connected with the partition to mount the first filter between the air outlet and the first air bellow; The side of the first air bellow which faces the partition is provided with a first side wall and a second side wall which are connected with each other, the second side wall is connected with the bottom wall of the first air bellow, the first side wall is vertically arranged relative to the bottom wall of the cabinet, and the second side wall is inclined relative to the bottom wall of the cabinet, when the first air bellow is rotated towards the partition, the second side wall is not easy to interfere with the partition; The partition comprises a first partition plate and a second partition plate, the first partition plate is vertically arranged relative to the bottom wall of the cabinet, and the first partition plate is connected with the top wall of the cabinet, the second partition plate has opposite first and second side edges, the first side edge is connected with the first partition plate, and the first side edge is inclined towards the second side edge.

2. The biological safety cabinet of claim 1, wherein, The first circulation cavity is located at the side of the working cavity, the second circulation cavity is located above the working cavity, and the air outlet is arranged above the first circulation cavity.

3. The biological safety cabinet of claim 1, wherein, Further comprising a first fan, the first air bellow is provided with a third side wall which is connected with the end of the extension direction of the first side wall, the first fan is communicated with the third side wall, and the first fan is arranged on the side of the third side wall which is away from the partition.

4. The biological safety cabinet of claim 1, wherein, The first air bellow further comprises a first connecting portion and a second connecting portion, the first connecting portion is rotationally connected with the first partition plate, and the second connecting portion is detachably connected with the cabinet.

5. The biological safety cabinet of claim 1, wherein, The partition further comprises a third partition plate which is connected between the second side edge and the outer wall of the working cavity.

6. The biological safety cabinet of claim 5, wherein, The second fan unit comprises a second air bellow and a second fan, the second air bellow is arranged above the working cavity, and the second fan is arranged on the side of the second air bellow which is away from the working cavity.

7. The biological safety cabinet of claim 6, wherein, Further comprising a second filter, the top of the working cavity is provided with a make-up air inlet, and the second filter is arranged between the second fan and the make-up air inlet.

8. The biological safety cabinet of claim 7, wherein, The side of the second air bellow which is close to the partition is rotationally connected with the third partition plate, and the side of the second air bellow which is away from the partition is detachably connected with the cabinet.

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